US20050073184A1 - Operator's seat supporting device for service vehicle - Google Patents
Operator's seat supporting device for service vehicle Download PDFInfo
- Publication number
- US20050073184A1 US20050073184A1 US10/922,268 US92226804A US2005073184A1 US 20050073184 A1 US20050073184 A1 US 20050073184A1 US 92226804 A US92226804 A US 92226804A US 2005073184 A1 US2005073184 A1 US 2005073184A1
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- United States
- Prior art keywords
- operator
- cylinder
- seat
- damper
- supporting device
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/501—Seat suspension devices actively controlled suspension, e.g. electronic control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/502—Seat suspension devices attached to the base of the seat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/505—Adjustable suspension including height adjustment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/506—Seat guided by rods
- B60N2/508—Scissors-like structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/509—Seat guided by slides or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/52—Seat suspension devices using fluid means
- B60N2/522—Seat suspension devices using fluid means characterised by dampening means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/52—Seat suspension devices using fluid means
- B60N2/527—Seat suspension devices using fluid means using liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/50—Seat suspension devices
- B60N2/54—Seat suspension devices using mechanical springs
- B60N2/544—Compression or tension springs
Definitions
- the present invention relates to an operator's seat supporting device for a service vehicle having a variable damping mechanism provided mainly in an operator's cabin of a construction machinery and capable of improving the availability.
- the conventional type of supporting device for an operator's seat provided in an operator's cabin of a construction machine such as a hydraulic shovel or a bulldozer receives a larger shock delivered to the seat on which the operator sits as compared to that delivered to an operator's seat in a general industrial vehicle, and there have been proposed various measures for a suspension structure for reducing the shock.
- FIG. 9A and FIG. 9B As a suspension structure for an operator's seat in this type of service vehicle, there has been known one, for instance, as shown in FIG. 9A and FIG. 9B .
- an X-shaped link 102 with the link members crossing each other in the longitudinal direction and linked to each other with a pin 103 at a crossing point on a base member 101 are provided with a prespecified space in both right and left sides thereof, and a link 110 with the height adjustable is provided between the right and left X-shaped links 102 , 102 .
- a base edge of one link member 102 a is pivotably connected to the base member 101 with the other edge connected to a seat mounting base frame 104 with a pin 105
- a lower edge of another link member 102 b can move on the base member 101 with the upper edge connected to the seat mounting base frame 104 with a pin 106
- the cushioning capability is provided by a suspension cylinder 107 .
- the height-adjustable link 110 is rolled in the state in which a roller 111 provided at a lower edge thereof is engaged with a guide rail 108 provided on the base member 101 with an upper edge thereof linked to an edge of a coil spring 112 on the seat mounting base frame 104 so that the tension is energized in the erecting direction, and further an adjustment knob 113 capable of adjusting the weight and height by displacing the link 110 in the vertical direction by means of adjusting tension of the spring 112 is provided therein.
- the reference numeral 115 indicates a seat
- the reference numeral 116 indicates a suspension cover.
- Reference 1 Japanese Patent Laid-Open Publication No. HEI 9-209406 discloses a suspension structure in which a forward section thereof is supported with a rubber spring system which elastically deforms little in the vertical direction, and a rear section thereof is supported by a coil damper unit system which elastically deforms largely in the vertical direction.
- a suspension mechanism for an operating seat using the X-shaped link is disclosed, for instance, in Reference 2 (Japanese Patent Laid-Open Publication No. HEI 11-280117).
- the link 102 occupies a space under the seat 115 , which narrows a space under the operator's feet.
- the X-shaped link is generally made from flat steel bars, so that the rigidity in the lateral direction is disadvantageously low, and as the joint section includes a pin, and therefore there is another disadvantage that it is difficult to insure strength against load.
- dampers having different structures respectively are provided in the front of and at the back of the seat, and the dampers are required to be adjusted discretely, and in addition the damper provided at the back of the seat is attached to an outer side of a backrest of the seat, so that, when an inclination of the backrest is changed, the buffering effect also varies, which is disadvantageous from a view point of structure and not preferable because of its complicated structure.
- the suspension device in the operator's seat device disclosed in the cited reference 2 also has the problems as described above.
- An object of the present invention is to provide an operator's seat supporting device for a service vehicle with a compact suspension mechanism with improved functions and capable of ensuring operator's comfortable posture during the operation.
- an operator's seat supporting device for a service vehicle at least biaxially supported by damper cylinders each are arranged along an axial line parallel to a vertical line passing through a shoulder of an operator sitting on a seat, and the operator's seat supporting device includes a posture adjusting mechanism provided by the sections supported by the damper cylinders and the seat.
- an operator's seat is mounted via a posture adjusting mechanism on a supporting plate supported by at least two damper cylinders at a place where an operator's seat is installed, and at least one of the damper cylinders reduces vibrations by making use of a magnetic rheological fluid.
- a buffering cylinder and a control cylinder for controlling vibrations with the magnetic rheological fluid may be monolithically formed.
- the damper cylinder may have a biaxial slide supporting structure, and a coil spring may be provided in the inner side or in the outer side from a shaft body having dual-shafts.
- an operator's seat rotating mechanism may be provided on the supporting plate supported by the damper cylinders.
- an area occupied by a seat supporting section on a floor surface can be reduced, whereby a wide space can be provided under an operator's feet to secure that the operator can take a comfortable posture during the operation.
- the height adjustment of the seat can be carried out independently from adjustment of a body weight of an operator sitting thereon with the optimal height provided to secure that the operator can take a more comfortable posture during the operation.
- a vibration damping force can variably be set according to change of the magnetic field, and a damping force can previously be set according to an operator's body weight, which advantageously improves the buffering effect against a shock by an external force.
- the structure is compact, so that a space required for installation thereof can be reduced, so that the occupied space under operator's feet can be minimized to secure that the operator can take a comfortable posture during the operation.
- a damper cylinder functioning as a supporting body has a biaxial slide structure, so that only a further small space is required, and a load is shared by a plurality of damper cylinders, so that the stable supporting force can be obtained without causing any saccadic movement.
- a rotating mechanism is provided on a supporting plate supported by the damper cylinder, so that a rotating movement can be carried out without spoiling the buffering function of the seat.
- FIG. 1 is a front elevational view showing a first embodiment of an operator's seat supporting device for a service vehicle according to the present invention
- FIG. 2 is a side elevational view of FIG. 1 ;
- FIG. 3 is a longitudinal cross-sectional view showing a damping function control mount
- FIG. 4 is a cross-sectional view showing the primary portion of the damping function control mount cylinder
- FIG. 5 is a longitudinal cross-sectional view showing a supporting damper
- FIG. 6 is a cross-sectional view showing a second embodiment of a damping function control mount cylinder
- FIG. 7 is a cross-sectional view showing the primary portion of the damping function control mount cylinder according to the second embodiment
- FIG. 8 is a cross-sectional view showing a third embodiment of a damping function control mount cylinder
- FIG. 9A is a side elevational view showing an embodiment of a supporting structure for an operator's seat based on the conventional technology.
- FIG. 9B is a view showing the operator's seat based on the conventional technology viewed from the front side.
- FIG. 1 is a front elevational view showing a first embodiment of the operator's seat supporting device for a service vehicle according to the present invention
- FIG. 2 is a side elevational view of FIG. 1
- FIG. 3 is a longitudinal cross-sectional view showing a damping function control mount
- FIG. 4 is a cross-sectional view showing the primary portion of the damping function control mount cylinder
- FIG. 5 is a longitudinal cross-sectional view showing a supporting damper.
- An operator's seat supporting device 1 includes two damper cylinders 50 , 30 erecting from and provided on a floor surface 2 of an operator's cabin with a prespecified space; a posture adjusting section 40 provided on a movable supporting plate 5 disposed via a rotating mechanism 4 on a supporting plate 3 supported by these damper cylinders 50 , 30 ; and an operator's seat 6 mounted via this posture adjusting section 40 .
- damper cylinders 50 , 30 one is a damping function control mount 50 (described simply as a damper cylinder 50 hereinafter) having a magnetic rheological fluid control function, and the other is a damper cylinder 30 for supporting (supporting damper).
- the damper cylinder 50 having a magnetic rheological fluid control function includes, as shown in the cross-sectional view in FIG. 3 , a buffering cylinder 53 externally and coaxially engaging a fixed member 51 having a mounting base 52 against the floor surface 2 (corresponding to the biaxial slide support structure according to the present invention), a coil spring 59 for restoring a damper provided inside the fixed member 51 , and a control cylinder 60 for a magnetic Theological fluid associated with the buffering cylinder 53 and capable of controlling operations of the buffering cylinder 53 , and a mounting base plate 58 ′ for mounting the supporting plate 3 thereon is provided on a top of the buffering cylinder 53 .
- the buffering cylinder 53 is a tubular cylinder including a movable member 54 provided outside and the fixed member 51 provided inside and coaxially engaged therewith.
- the movable member 54 is so connected that a male screw 54 b formed on an external peripheral surface of an upper end of the cylinder member 54 a is screwed to a female screw 54 d formed on an internal peripheral surface of a drooping spherical base section 54 c . Further, a female screw 54 e is formed on an inner peripheral surface of a lower end of the cylinder member 54 a , to which a cover member 54 f with a male screw formed is screwed.
- An internal capacity of the cylinder is controlled to a prespecified value by the cylinder member 54 a , the base section 54 c and the cover member 54 f.
- the buffering cylinder 53 is slidably assembled with the fixed member 51 with a circular projection 55 functioning as a piston integrally provided at an intermediate section of the fixed member 51 , and a seal ring 55 b is engaged in a groove section 55 a formed on an outer peripheral surface of the circular projection 55 and contacts an internal surface of the movable member 54 (cylinder member 54 a ) with a first chamber 56 a and a second chamber 56 b defined vertically.
- the internal peripheral surface of the cylinder member 54 a located at an upper edge section of the first chamber 56 a is projected in a ring-shaped manner, and a seal ring 56 c is fitted to a groove formed at the tip end thereof.
- the screwing portion of the cover member 54 f located at a lower edge section of the second chamber 56 b is formed cylindrical, and seal rings 56 d and 56 e are fitted to grooves formed on upper and lower sides of the internal peripheral surface thereof.
- the control cylinder 60 includes a cylindrical main body 61 , an upper cover member 63 and a lower cover member 63 ′ that cover holes 62 opening at the upper and lower part of the cylindrical main body 61 .
- An insert body 64 is provided inside the cylindrical main body 61 on the center line of the cylindrical main body 61 , the upper and lower edges of the insert body 64 is joined and fixed to the cylindrical main body 61 as well as to the lower cover member 63 ′.
- the insert body 64 includes a clearance forming section 64 a made of a magnetic material such as electromagnetic soft iron, and a shaft 64 b made of a non-magnetic material such as stainless, the shaft 64 b press-fitted to the upper and lower edges of the clearance forming section 64 a.
- a bobbin 61 a made of a non-magnetic material is embedded on an inner peripheral surface of the cylindrical main body 61 corresponding to the position of the clearance forming section 64 a .
- a coil 61 b with a lead wire being winded is provided around the bobbin 61 a , the end of the lead wire being connected to a controller provided at the outside of the damper cylinder 50 .
- the bobbin 61 a and the coil 61 b function as an electromagnetic control section that controls the viscosity of the magnetic rheological fluid flowing through the cylinder.
- Two connecting holes 65 are formed at the upper and lower parts of a lateral surface of the cylindrical main body 61 to communicate the inside and the outside thereof, and the connecting holes 65 are respectively connected to two connecting holes 54 g penetrating the inside and the outside of the cylinder member 54 a via a cylindrical connecting member 66 . It is to be noted that the one of connecting holes 54 g is connected to the first chamber 56 a while the other one is connected to the second chamber 56 b.
- a buffering chamber 67 is provided below the upper cover member 63 , so that expansion of the magnetic rheological fluid to be sealed therein due to temperature change can be accommodated.
- the interior of the cylindrical main body 61 is divided into the upper side chamber 62 a and the lower side chamber 62 b by interposing the clearance forming section 64 a , thereby forming a space S between the inner surface of the cylindrical main body 61 and the outer surface of the clearance forming section 64 a .
- the space S functions as a restrictor for adjusting the fluid flow rate flowing between the upper side chamber 62 a and the lower side chamber 62 b.
- a magnetic rheological fluid (such as, for instance, iron carbonyl particles suspended in mineral oil as a carrier) is filled in each of the control cylinder 60 and the buffering cylinder 53 each having the configuration as described above.
- the damper cylinder 30 for supporting includes, as shown in FIG. 5 , a fixed member 31 having a column-like form with a mounting base 32 attached at a lower edge thereof, a tubular movable member 34 engaged with this fixed member 31 and having a base plate for mounting the supporting plate 3 thereon; and a coil spring 37 provided concentrically with the lower edge supported by a top surface of a bottom edge member 31 a of the fixed member 31 and also the upper edge thereof contacting an internal bottom surface of a mounting cap member 35 of the movable member 34 .
- the fixed member 31 has the structure in which the bottom edge member 31 a which is a tubular body having prespecified dimension and closes the lower edge section of the fixed member 31 is attached, and the mounting base 32 is monolithically attached to this bottom edge member 31 a with the upper edge section opened.
- a circular member 34 a is monolithically attached to an upper edge section of the movable member 34 , and the cap member 35 is screwed into an upper edge section of this circular member 34 a to close the upper section.
- Monolithically attached to a top surface of this cap member 35 is a mounting base plate 38 for supporting the supporting plate 3 .
- Bearings 36 , 36 ′ are monolithically attached to an internal peripheral surface of the circular member 34 a of the movable member 34 and a portion 34 b thereof with the internal peripheral section of the lower edge section having a smaller diameter respectively so that the fixed member 31 can be slid in the vertical direction without losing the concentric positional relation thereto.
- the damper cylinders 50 , 30 having the configuration as described above respectively are provided in the erecting state on a floor surface of the operator's cabin so that the center line is substantially aligned to a vertical plane (vertical line C) passing through a shoulder Q′ of an operator Q when the operator Q sits on the seat 6 with the normal posture with the mounting bases 52 , 32 attached to the damper cylinders 50 , 30 respectively.
- These two damper cylinders 50 , 30 support the supporting plate 3 having a dimension slightly larger than the width of a seat plate section 6 a of the seat 6 .
- the operator Q sitting on the seat 6 is supported by the damper cylinders 50 , 30 at a position on a line passing through a gravity center or a position close to the gravity center of the operator Q, so that, although the operator Q is supported by two damper cylinders, vibrations in the longitudinal direction and those in the lateral direction do not occur, and the seat 6 is securely supported with the simple supporting structure.
- a swivel ring (rotating mechanism 4 ) is provided with the shaft center positioned at a central position of a line connecting centers supported by the damper cylinders 50 , 30 on the supporting plate 3 , and the movable supporting plate 5 is attached thereto with a supporting member 4 b attached to the swivel ring so that the swivel ring can freely swivel.
- Slide mechanisms 41 each for adjusting an operator's position in the longitudinal direction as a posture adjusting section 40 and a height adjusting mechanism 42 are provided on the movable supporting plate 5 , and the seat 6 is attached thereto via the height adjusting mechanism 42 .
- the slide mechanisms 41 each extending in the longitudinal direction are arranged with a prespecified space in the lateral direction, and a mounting base member 7 of the seat 6 is supported by the movable member.
- the slide mechanism 41 has a known structure, and a movable member can intermittently move in the longitudinal direction thereon along a rail so that a position of the operator Q in the longitudinal direction can be adjusted.
- the height adjusting mechanism 42 having a known structure is provided on the mounting base member 7 , and a seat plate section 6 a of the seat 6 is attached with a known means to a seat mounting frame body above this height adjusting mechanism 42 .
- the height adjusting mechanism 42 employed in the present invention can adjust a position in the vertical direction with cross links. It is to be noted that also the height adjusting mechanism 42 not employing the cross links may be used in the present invention.
- the reference numerals 8 and 8 ′ each indicate a console in which an operating lever or other operating sections of machines and equipments are accommodated, and this console 8 is monolithically attached with a bracket to the mounting base member 7 , and can move in the vertical direction and swivel together with the operator's seat 6 to allow for operations without requiring an operator to change the positional relation therewith.
- the reference numeral 6 b in the figure indicates a backrest.
- the operator's seat supporting device 1 is installed in an operator's cabin (not shown) of a service vehicle, and supports the operator's seat 6 as described above.
- the operator's seat supporting device 1 having the configuration as described above according to this embodiment can set an operator's position in the longitudinal direction with the slide mechanisms 41 and the operator's height with the height adjusting mechanism 42 respectively, when the operator adjusts the operating posture.
- the two damper cylinders 50 , 30 are balanced with the energizing forces of the coil springs 59 , 37 respectively in the normal state to support the operator's seat 6 .
- Vibrations due to a shock or any other load from the outside during the operation are damped by the two damper cylinders 50 , 30 supporting the seat 6 , and one damper cylinder 50 has a function for controlling attenuation with an electromagnetic control section with a magnetic rheological fluid included therein, and with the configuration as described above, a signal from a sensor for detecting vibrations previously installed in an operator's cabin or on a machine frame is received by the controller, and a current is flown at a required rate to the coil 61 b of the control cylinder 60 according to an output signal generated by comparing the received signal to preset data, so that the vibrations are quickly damped by controlling the pressure difference generated between the first chamber 56 a and the second chamber 56 b in the buffering cylinder 53 from the control cylinder 60 , thus the vibration-controlling function being provided.
- the other damper cylinder 30 has the function for dampening a shock by following the vibration controlling and buffering function of the damper cylinder 50 with a cushioning function with the coil spring 37 with the movable member 34 against the fixed member 31 provided therein. Therefore, even when a large shock is applied thereto, vibrations can quickly be absorbed and dampened.
- the movable member 54 displaces against the fixed member 51 in the axis line direction.
- the movable member 54 moves in the downward direction of the vertical direction against the energizing force by the coil spring 59 ,the cylinder member 54 a of the movable member 54 acts to push down the magnetic Theological fluid in the first chamber 56 a.
- the magnetic Theological fluid in the first chamber 56 a is pushed out into an upper side chamber 62 a of the control cylinder 60 through the connecting hole 54 g , the connecting member 66 and the connecting hole 65 by pushing down action of the magnetic rheological fluid.
- a reduced pressure state is generated in the second chamber 56 b of the buffering cylinder 53 , so that the magnetic Theological fluid is fed from a lower side chamber 62 b of the control cylinder 60 through the connecting hole 65 , the connecting member 66 and the connecting hole 54 g into the second chamber 56 b.
- the upper side chamber 62 a of the control cylinder 60 enters the pressurized state, while the lower side chamber 62 b enters the reduced pressure state, so that the magnetic rheological fluid filled in the upper side chamber 62 a flows toward the lower side chamber 62 b due to the pressure difference.
- a flow rate of the magnetic rheological fluid is restricted at the space S between the outer surface of the clearance forming section 64 a and the inner surface of the cylindrical main body 61 , the space S separating the upper side chamber 62 a from the lower side chamber 62 b.
- a vibration signal indicating vibrations of the fluid passing through the space S is sent from the sensor (not shown) to the controller, and the coil 61 b is energized at a prespecified current rate based on preset data so that the magnetic field corresponding to the current is generated between the clearance forming section 64 a made of a magnetic material and the cylindrical main body 61 with the flowing magnetic Theological fluid magnetized, thereby the magnetic rheological fluid being magnetized to change the viscosity.
- fluidity of the magnetic Theological fluid changes in proportion to intensity of the magnetic field.
- the movement speed in the vertical direction of the buffering cylinder 53 is controlled to dampen a shock loaded thereto.
- the cushioning function of buffering a sudden and heavy shock with a soft buffering action provided by a soft spring action and also suppressing vibrations occurring after the shock is loaded by giving a damping force with the control cylinder 60 is achieved in the present invention as described above.
- the other damper cylinder 30 has a supporting function with a simple structure including the coil spring 37 for buffering therein, and performs the supporting function in association with actions of the damper cylinder 50 as a damper cylinder supporting the whole seat 6 leaving a main portion of the vibration-controlling function for dampening vibration to the damper cylinder 50 .
- the seat 6 is smoothly buffered against vibrations with the two damper cylinders 50 , 30 , thus comfortable and smooth operations being insured to an operator.
- the operator's seat supporting device 1 has the configuration in which vibrations are dampened with a vibration buffering device completely different and independent from the seat height adjusting mechanism 42 , so that adjustment in response to an operator's body weight is not required, and the efficient buffering function can be provided in the optimal state only by carrying out positional adjustment according to the operator's body type, thereby the operator performing required operations in the comfortable state. Further a wide space can be secured under an operator's feet, so that the problem of narrow space under the operator's feet as experienced in the supporting device based on the conventional technology can be eliminated, whereby there is provided the advantage that an operator can perform various operations in a relaxed and comfortable posture.
- the damper cylinder 10 according to the second embodiment having a magnetic Theological fluid control function includes, as shown in the cross-sectional view in FIG. 6 , a buffering cylinder 13 externally and coaxially engaging a fixed member 11 having a mounting base 12 against the floor surface 2 (corresponding to the biaxial slide support structure according to the present invention), a coil spring 19 for restoring a damper provided inside the fixed member 11 , and a control cylinder 20 for a magnetic rheological fluid associated with the buffering cylinder 13 and capable of controlling operations of the buffering cylinder 13 , and a mounting base plate 18 ′ for mounting the supporting plate 3 thereon is provided on a top of the buffering cylinder 13 .
- the buffering cylinder 13 is a tubular cylinder including a movable member 14 provided outside and the fixed member 11 provided inside and coaxially engaged therewith.
- the movable member 14 has a thick circular member 14 b connected to and integrated with an upper edge section of the cylinder member 14 a and also has a circular head member 14 c screwed into a lower edge section thereof, and controls an internal capacity of the cylinder to a prespecified value with an internal lower edge of the circular member 14 b fixed to an upper edge section of the cylinder member 14 a and an internal upper edge of the head member 14 c.
- the buffering cylinder 13 is slidably assembled with the fixed member 11 with a circular projection 15 functioning as a piston integrally provided at an intermediate section of the fixed member 11 , and a seal ring 15 b is engaged in a groove section 15 a formed on an outer peripheral surface of the circular projection 15 and contacts an internal surface of the movable member 14 (cylinder member 14 a ) with a first chamber 16 a and a second chamber 16 b defined in front and at the back thereof.
- a seal ring 16 d is engaged in each of the first chamber 16 a and the second chamber 16 b to restrict the fluid from leaking from the inside of the cylinder.
- Bearing bushes 17 guided by the fixed member 11 are provided in the circular member 14 b and the head member 14 c each connected to the movable member 14 respectively, and with the bearing bushes 17 the movable member 14 can slide up and down being aligned with the center line and also accommodate a load applied to the supporting plate 3 in the stable state. Therefore the two bearing bushes 17 , 17 should preferably be arranged with a space between the two within a reasonable range.
- a seal member 17 ′ is provided in the engaging state at an outer side from the engaging position of the bearing bush 17 so that the chambers 16 a and 16 b are water-tight against the outside.
- a cap member 18 is screwed into the circular member 14 b at a top section of the buffering cylinder 13 having the configuration as described above, and a mounting base plate 18 ′ for mounting the supporting plate 3 thereon is attached to this cap member 18 .
- the control cylinder 20 has a hole 22 with a prespecified internal diameter penetrating through a main body 21 with prespecified dimensions in the vertical direction and also has an upper cover member 23 and a bottom cover member 23 ′ provided to close two edge sections of this penetrating hole 22 .
- a supporting member consisting of a coil section 25 and a sleeve 24 a is provided between the upper cover member 23 and the bottom cover member 23 ′, and the supporting member is so arranged that the coil section 25 is located at an intermediate position of the supporting member supported by the sleeve 24 a made from a non-magnetic material with the upper and bottom sections engaged with the supporting member.
- a slight clearance “a” is formed between an internal peripheral surface of the main body 21 and an external peripheral surface of a bobbin 25 a of the coil section 25 .
- a lead wire 27 extending over a controller not shown enabling electric control is connected to a coil 25 b of the coil section 25 , and the coil 25 b is attached to the bobbin 25 a made of magnetic material as the core of a wire-wound section of the coil section 25 with the small clearance “a” defined and maintained between the bobbins 25 a and an internal peripheral surface of the cylinder member 26 to form an electromagnetic control section causing a flow resistance of the magnetic Theological fluid.
- the main body 21 is made from an electromagnetic soft iron for example so that a magnetic field is strongly formed only in the range of the bobbin 25 a.
- connecting holes 28 a and 28 b communicating to the first chamber 16 a and the second chamber 16 b inside the cylinder member 14 a of the buffering cylinder 13 are provided with appropriate spaces from the cylinder member 26 respectively so that the magnetic rheological fluid can flow from the control cylinder 20 to the buffering cylinder 13 .
- a buffering chamber 29 with gas such as the air included therein is provided at the top of the control cylinder 20 so that expansion of the magnetic rheological fluid due to temperature change can be accommodated.
- a magnetic rheological fluid (such as, for instance, iron carbonyl particles suspended in mineral oil as a carrier) is filled in each of the control cylinder 20 and the buffering cylinder 13 each having the configuration as described above.
- the electromagnetic control section causing a flow resistance in the magnetic rheological fluid in the control cylinder 20 includes a cylinder member of the control cylinder 20 and the coil section 25 provided therein, and also includes a known controller not shown and connected with the lead wire 27 to the coil section 25 .
- the coil section 25 is energized via the controller through the lead wire 27 .
- the electromagnetic control section controls a signal from a sensor for detecting vibration provided, for instance, in an operator's cabin not shown, and changes intensity of a magnetic flux generated between the bobbin 25 a and the main body 21 by flowing a prespecified rate of electric current to the coil section 25 according to an output signal therefrom, so that the electromagnetic control section can increase or reduce the flow resistance by changing the apparent viscosity (fluidity) of the magnetic rheological fluid within the magnetic field when the magnetic Theological fluid flows through the narrow clearance “a” formed between the bobbin 25 a and an internal wall of the main body 21 to control the vibration-controlling function.
- FIG. 8 is a cross-sectional view showing a third embodiment of a damping function control mount cylinder.
- the damper cylinder 10 A has a control cylinder 20 A incorporated in and at a central position of the buffering cylinder 13 A.
- a coil spring 19 A for restoration is provided between a mounting base 12 A provided outside the buffering cylinder 13 A and attached to a lower edge of the fixed member 11 A and a mounting base plate 18 a provided at an upper edge of the movable member 14 A.
- the buffering cylinder 13 A includes the fixed member 11 A having the mounting base 12 A and the movable member 14 A sliding in the axis line direction in the inner side therefrom, which are combined with each other.
- the fixed member 11 A constituting the buffering cylinder 13 A has the mounting base 12 A in the lower section, and in the upper section, a head member 11 b is screwed into and fixed to an upper edge section of the cylinder member 11 a which is a main body of the fixed member 11 A.
- a lower section member 11 c is fixed to a lower edge section of the cylinder member 11 a , and a circular projection 15 A of the movable member 14 A is slidably provided between an upper edge of the lower section member 11 c and a lower edge of the head member 11 b , so that the first chamber 16 a is separated from the second chamber 16 b by the circular projection 15 A.
- the movable member 14 A is a tubular body slidably and coaxially engaged in the fixed member 11 A, in which an upper edge section thereof protrudes by an appropriate length from an upper edge of the fixed member 11 A, and at the top, the mounting base plate 18 a monolithically formed with a screwed cap 18 A for supporting the supporting plate 3 is attached thereto, while a screw mounted cover 14 e is provided at the lower edge section to function as a piston and a rod.
- the circular projection 15 A is provided on an external peripheral surface of the intermediate section of this movable member 14 A, and a seal ring 15 b is engaged in a groove section 15 a formed on the external peripheral surface and contacts an internal peripheral surface of the cylinder member 11 a of the fixed member 11 A to define a third chamber 16 f and a fourth chamber 16 g in the cylinder.
- the control cylinder 20 A is coaxially provided and engaged in the movable member 14 A.
- a supporting member consisting of a coil section 25 and the sleeve 24 a is provided with a lower edge thereof engaged in and supported by a shaft supporting hole 14 f provided on a top surface of the screw mounted cover 14 e and also with an upper edge thereof engaged in a shaft hole 14 f ′ provided at a center of a bottom surface of a supporting piece 14 h engaged in the movable member 14 A, and further a cylinder member 26 A made from electromagnetic soft iron is concentrically provided outside the supporting member with both edges thereof held by the screw mounted cover 14 e and the supporting piece 14 h .
- the coil section 25 is provided at the intermediate position with the upper and lower sections thereof supported by a non-magnetic sleeve 24 a with a slight clearance left with an internal peripheral surface of the cylinder member 26 A made from electromagnetic soft iron.
- a bobbin 25 a made of a magnetic material are provided at the wire-winded section of the coil section 25 so as to be the core of the wire-winded section, and a narrow clearance “a” is formed between the bobbin 25 a and an internal peripheral surface of the cylinder member 26 A.
- the lead wire 27 leading to a controller (not shown) through inside of the supporting member is connected to the coil 25 b of the coil section 25 , and a required current is fed through the lead wire 27 under control by the controller.
- a connecting hole 14 j communicating to the first chamber 16 a and the third chamber 16 f and a connecting hole 14 k communicating to the second chamber 16 b and the fourth chamber 14 g are provided above and under internal and external circular projections 15 A, 15 B of the movable member 14 A, and further a connecting hole 26 a communicating to the third chamber 16 f and the upper side chamber 22 a inside the control cylinder 20 A and a connecting hole 26 b communicating to the fourth chamber 16 g and the lower side chamber 22 b of the control cylinder 20 A are provided in the cylinder member 26 A respectively.
- the chambers described above are filled with a magnetic rheological fluid. Further seal rings are provided at an upper edge section of an internal peripheral surface of the head member 11 b positioned on the fixed member 11 A and at a lower edge section of an internal peripheral surface of the lower section member 11 c respectively to keep inside of the cylinder water-tight.
- the damper cylinder 10 A having the configuration as described above is arranged like in the embodiment described above and is used to excite the coil section 25 of the control cylinder 20 A under control by the controller, and the functions are the same as those described in the embodiment above.
- the first chamber 16 a and the third chamber 16 f in the buffering cylinder 13 A enter the reduced pressure state, so that the fluid in the upper side chamber 22 a of the control cylinder 20 A passing through the connecting hole 14 j flows from the third chamber 16 f into the first chamber 16 a due to a pressure difference.
- the magnetic rheological fluid flows from the lower side chamber 22 b through the clearance “a” into the upper side chamber 22 a due to a pressure difference between the lower side chamber 22 b and the upper side chamber 22 a.
- movement velocity of the buffering cylinder 13 A is controlled by controlling a signal from a detection sensor (not shown), which is provided in the machine side against the magnetic rheological fluid and detects vibrations of the magnetic rheological fluid passing through the clearance “a”, with the controller based on data to feed a current at a required rate through the lead wire 27 to the coil section 25 and generate a magnetic field corresponding to the current value around the bobbin 25 a for the purpose to change fluidity of the magnetic Theological fluid to control the flow resistance.
- a detection sensor not shown
Abstract
An operator's seat (6) is mounted via a posture adjusting mechanism (40) on a supporting plate (3) supported by at least two damper cylinders (50, 30) at a place where an operator's seat is installed, and at least one of the damper cylinders (50, 30) is used as a damper cylinder (50) for reducing vibrations by making use of a magnetic rheological fluid.
Description
- 1. Field of the Invention
- The present invention relates to an operator's seat supporting device for a service vehicle having a variable damping mechanism provided mainly in an operator's cabin of a construction machinery and capable of improving the availability.
- 2. Description of Related Art
- The conventional type of supporting device for an operator's seat provided in an operator's cabin of a construction machine such as a hydraulic shovel or a bulldozer receives a larger shock delivered to the seat on which the operator sits as compared to that delivered to an operator's seat in a general industrial vehicle, and there have been proposed various measures for a suspension structure for reducing the shock.
- As a suspension structure for an operator's seat in this type of service vehicle, there has been known one, for instance, as shown in
FIG. 9A andFIG. 9B . In this suspension structure, anX-shaped link 102 with the link members crossing each other in the longitudinal direction and linked to each other with apin 103 at a crossing point on abase member 101 are provided with a prespecified space in both right and left sides thereof, and alink 110 with the height adjustable is provided between the right andleft X-shaped links - In the X-shaped
link 102, a base edge of onelink member 102 a is pivotably connected to thebase member 101 with the other edge connected to a seatmounting base frame 104 with apin 105, and a lower edge of anotherlink member 102 b can move on thebase member 101 with the upper edge connected to the seatmounting base frame 104 with apin 106, and the cushioning capability is provided by asuspension cylinder 107. - The height-
adjustable link 110 is rolled in the state in which aroller 111 provided at a lower edge thereof is engaged with aguide rail 108 provided on thebase member 101 with an upper edge thereof linked to an edge of acoil spring 112 on the seatmounting base frame 104 so that the tension is energized in the erecting direction, and further anadjustment knob 113 capable of adjusting the weight and height by displacing thelink 110 in the vertical direction by means of adjusting tension of thespring 112 is provided therein. In the figures, thereference numeral 115 indicates a seat, and thereference numeral 116 indicates a suspension cover. - Reference 1 (Japanese Patent Laid-Open Publication No. HEI 9-209406) discloses a suspension structure in which a forward section thereof is supported with a rubber spring system which elastically deforms little in the vertical direction, and a rear section thereof is supported by a coil damper unit system which elastically deforms largely in the vertical direction. In addition, a suspension mechanism for an operating seat using the X-shaped link is disclosed, for instance, in Reference 2 (Japanese Patent Laid-Open Publication No. HEI 11-280117).
- However, with the supporting means for an operator's seat employing the
X-shaped link 102 as used in the conventional technology, thelink 102 occupies a space under theseat 115, which narrows a space under the operator's feet. - Further there is another disadvantage that a damper is provided externally, which disables effective utilization of the space.
- In addition, the X-shaped link is generally made from flat steel bars, so that the rigidity in the lateral direction is disadvantageously low, and as the joint section includes a pin, and therefore there is another disadvantage that it is difficult to insure strength against load.
- As the mechanism for adjusting a body weight is integrated with that for adjusting the height, it is difficult to achieve the complete balance between an operator's body type and the operator's body weight.
- Namely, when an operator is a person not having the standard body type such as a relatively heavy person having the low seating height or a person having the relatively high seating height against the body weight, if a seat height is adjusted to the operator's posture, the buffering function is disadvantageously lost, which is another problem.
- In the suspension seat structure as disclosed in the cited
reference 1, as dampers having different structures respectively are provided in the front of and at the back of the seat, and the dampers are required to be adjusted discretely, and in addition the damper provided at the back of the seat is attached to an outer side of a backrest of the seat, so that, when an inclination of the backrest is changed, the buffering effect also varies, which is disadvantageous from a view point of structure and not preferable because of its complicated structure. - The suspension device in the operator's seat device disclosed in the cited
reference 2 also has the problems as described above. - An object of the present invention is to provide an operator's seat supporting device for a service vehicle with a compact suspension mechanism with improved functions and capable of ensuring operator's comfortable posture during the operation.
- In an operator's seat supporting device for a service vehicle according to an aspect of the present invention, at least biaxially supported by damper cylinders each are arranged along an axial line parallel to a vertical line passing through a shoulder of an operator sitting on a seat, and the operator's seat supporting device includes a posture adjusting mechanism provided by the sections supported by the damper cylinders and the seat.
- In an operator's seat supporting device for a service vehicle according to another aspect of the present invention, an operator's seat is mounted via a posture adjusting mechanism on a supporting plate supported by at least two damper cylinders at a place where an operator's seat is installed, and at least one of the damper cylinders reduces vibrations by making use of a magnetic rheological fluid.
- Preferably, with the above operator's seat supporting device for a service vehicle, in the damper cylinder for reducing vibrations by making use of the magnetic rheological fluid, a buffering cylinder and a control cylinder for controlling vibrations with the magnetic rheological fluid may be monolithically formed.
- Preferably, with the operator's seat supporting device for a service vehicle, the damper cylinder may have a biaxial slide supporting structure, and a coil spring may be provided in the inner side or in the outer side from a shaft body having dual-shafts.
- Preferably, with the operator's seat supporting device for a service vehicle, an operator's seat rotating mechanism may be provided on the supporting plate supported by the damper cylinders.
- With the configuration as described above, an area occupied by a seat supporting section on a floor surface can be reduced, whereby a wide space can be provided under an operator's feet to secure that the operator can take a comfortable posture during the operation.
- Further there is also provided the advantage that a floor surface of the operator's cabin can easily be cleaned.
- With the configuration as described above, in addition to the advantages described above, there is provided the advantage that the height adjustment of the seat can be carried out independently from adjustment of a body weight of an operator sitting thereon with the optimal height provided to secure that the operator can take a more comfortable posture during the operation. Further by making use of a magnetic rheological fluid, a vibration damping force can variably be set according to change of the magnetic field, and a damping force can previously be set according to an operator's body weight, which advantageously improves the buffering effect against a shock by an external force.
- When the configuration as described above is employed, the structure is compact, so that a space required for installation thereof can be reduced, so that the occupied space under operator's feet can be minimized to secure that the operator can take a comfortable posture during the operation.
- With the configuration described above, a damper cylinder functioning as a supporting body has a biaxial slide structure, so that only a further small space is required, and a load is shared by a plurality of damper cylinders, so that the stable supporting force can be obtained without causing any saccadic movement.
- Further with the configuration described above, a rotating mechanism is provided on a supporting plate supported by the damper cylinder, so that a rotating movement can be carried out without spoiling the buffering function of the seat.
-
FIG. 1 is a front elevational view showing a first embodiment of an operator's seat supporting device for a service vehicle according to the present invention; -
FIG. 2 is a side elevational view ofFIG. 1 ; -
FIG. 3 is a longitudinal cross-sectional view showing a damping function control mount; -
FIG. 4 is a cross-sectional view showing the primary portion of the damping function control mount cylinder; -
FIG. 5 is a longitudinal cross-sectional view showing a supporting damper; -
FIG. 6 is a cross-sectional view showing a second embodiment of a damping function control mount cylinder; -
FIG. 7 is a cross-sectional view showing the primary portion of the damping function control mount cylinder according to the second embodiment; -
FIG. 8 is a cross-sectional view showing a third embodiment of a damping function control mount cylinder; -
FIG. 9A is a side elevational view showing an embodiment of a supporting structure for an operator's seat based on the conventional technology; and -
FIG. 9B is a view showing the operator's seat based on the conventional technology viewed from the front side. - Embodiments of an operator's seat supporting device for a service vehicle according to the present invention is described below with reference to the related drawings.
-
FIG. 1 is a front elevational view showing a first embodiment of the operator's seat supporting device for a service vehicle according to the present invention;FIG. 2 is a side elevational view ofFIG. 1 ;FIG. 3 is a longitudinal cross-sectional view showing a damping function control mount;FIG. 4 is a cross-sectional view showing the primary portion of the damping function control mount cylinder; andFIG. 5 is a longitudinal cross-sectional view showing a supporting damper. - An operator's
seat supporting device 1 according to this embodiment includes twodamper cylinders floor surface 2 of an operator's cabin with a prespecified space; aposture adjusting section 40 provided on a movable supportingplate 5 disposed via arotating mechanism 4 on a supportingplate 3 supported by thesedamper cylinders seat 6 mounted via thisposture adjusting section 40. - Of the
damper cylinders damper cylinder 50 hereinafter) having a magnetic rheological fluid control function, and the other is adamper cylinder 30 for supporting (supporting damper). - The
damper cylinder 50 having a magnetic rheological fluid control function includes, as shown in the cross-sectional view inFIG. 3 , a bufferingcylinder 53 externally and coaxially engaging a fixedmember 51 having amounting base 52 against the floor surface 2 (corresponding to the biaxial slide support structure according to the present invention), acoil spring 59 for restoring a damper provided inside thefixed member 51, and acontrol cylinder 60 for a magnetic Theological fluid associated with thebuffering cylinder 53 and capable of controlling operations of the bufferingcylinder 53, and amounting base plate 58′ for mounting the supportingplate 3 thereon is provided on a top of thebuffering cylinder 53. - The buffering
cylinder 53 is a tubular cylinder including amovable member 54 provided outside and the fixedmember 51 provided inside and coaxially engaged therewith. - The
movable member 54 is so connected that amale screw 54 b formed on an external peripheral surface of an upper end of thecylinder member 54 a is screwed to afemale screw 54 d formed on an internal peripheral surface of a droopingspherical base section 54 c. Further, afemale screw 54 e is formed on an inner peripheral surface of a lower end of thecylinder member 54 a, to which acover member 54 f with a male screw formed is screwed. - An internal capacity of the cylinder is controlled to a prespecified value by the
cylinder member 54 a, thebase section 54 c and thecover member 54 f. - The buffering
cylinder 53 is slidably assembled with the fixedmember 51 with acircular projection 55 functioning as a piston integrally provided at an intermediate section of the fixedmember 51, and aseal ring 55 b is engaged in agroove section 55 a formed on an outer peripheral surface of thecircular projection 55 and contacts an internal surface of the movable member 54 (cylinder member 54 a) with afirst chamber 56 a and asecond chamber 56 b defined vertically. - Incidentally, the internal peripheral surface of the
cylinder member 54 a located at an upper edge section of thefirst chamber 56 a is projected in a ring-shaped manner, and aseal ring 56 c is fitted to a groove formed at the tip end thereof. Further, the screwing portion of thecover member 54 f located at a lower edge section of thesecond chamber 56 b is formed cylindrical, and seal rings 56 d and 56 e are fitted to grooves formed on upper and lower sides of the internal peripheral surface thereof. With the use of the seal rings 56 c, 56 d and 55 b, the sealability of thefirst chamber 56 a and thesecond chamber 56 b is secured. Additionally, theseal ring 56 e inhibits the dust entering from the outside. - The
control cylinder 60 includes a cylindricalmain body 61, anupper cover member 63 and alower cover member 63′ that cover holes 62 opening at the upper and lower part of the cylindricalmain body 61. - An
insert body 64 is provided inside the cylindricalmain body 61 on the center line of the cylindricalmain body 61, the upper and lower edges of theinsert body 64 is joined and fixed to the cylindricalmain body 61 as well as to thelower cover member 63′. - The
insert body 64 includes aclearance forming section 64 a made of a magnetic material such as electromagnetic soft iron, and ashaft 64 b made of a non-magnetic material such as stainless, theshaft 64 b press-fitted to the upper and lower edges of theclearance forming section 64 a. - On the other hand, as shown in
FIG. 4 , abobbin 61a made of a non-magnetic material is embedded on an inner peripheral surface of the cylindricalmain body 61 corresponding to the position of theclearance forming section 64 a. Acoil 61 b with a lead wire being winded is provided around thebobbin 61 a, the end of the lead wire being connected to a controller provided at the outside of thedamper cylinder 50. Thebobbin 61 a and thecoil 61 b function as an electromagnetic control section that controls the viscosity of the magnetic rheological fluid flowing through the cylinder. - Two connecting
holes 65 are formed at the upper and lower parts of a lateral surface of the cylindricalmain body 61 to communicate the inside and the outside thereof, and the connectingholes 65 are respectively connected to two connectingholes 54 g penetrating the inside and the outside of thecylinder member 54 a via acylindrical connecting member 66. It is to be noted that the one of connectingholes 54 g is connected to thefirst chamber 56 a while the other one is connected to thesecond chamber 56 b. - Further a
buffering chamber 67 is provided below theupper cover member 63, so that expansion of the magnetic rheological fluid to be sealed therein due to temperature change can be accommodated. - When the
insert body 64 is installed in the cylindricalmain body 61, as shown inFIG. 4 , the interior of the cylindricalmain body 61 is divided into theupper side chamber 62 a and thelower side chamber 62 b by interposing theclearance forming section 64 a, thereby forming a space S between the inner surface of the cylindricalmain body 61 and the outer surface of theclearance forming section 64 a. The space S functions as a restrictor for adjusting the fluid flow rate flowing between theupper side chamber 62 a and thelower side chamber 62 b. - A magnetic rheological fluid (such as, for instance, iron carbonyl particles suspended in mineral oil as a carrier) is filled in each of the
control cylinder 60 and thebuffering cylinder 53 each having the configuration as described above. - In contrast to the
damper cylinder 50 as described above, thedamper cylinder 30 for supporting includes, as shown inFIG. 5 , a fixedmember 31 having a column-like form with a mountingbase 32 attached at a lower edge thereof, a tubularmovable member 34 engaged with this fixedmember 31 and having a base plate for mounting the supportingplate 3 thereon; and acoil spring 37 provided concentrically with the lower edge supported by a top surface of abottom edge member 31 a of the fixedmember 31 and also the upper edge thereof contacting an internal bottom surface of a mountingcap member 35 of themovable member 34. - The fixed
member 31 has the structure in which thebottom edge member 31 a which is a tubular body having prespecified dimension and closes the lower edge section of the fixedmember 31 is attached, and the mountingbase 32 is monolithically attached to thisbottom edge member 31 a with the upper edge section opened. - A
circular member 34 a is monolithically attached to an upper edge section of themovable member 34, and thecap member 35 is screwed into an upper edge section of thiscircular member 34 a to close the upper section. Monolithically attached to a top surface of thiscap member 35 is a mountingbase plate 38 for supporting the supportingplate 3. -
Bearings circular member 34 a of themovable member 34 and aportion 34 b thereof with the internal peripheral section of the lower edge section having a smaller diameter respectively so that the fixedmember 31 can be slid in the vertical direction without losing the concentric positional relation thereto. - As shown in
FIGS. 1 and 2 , thedamper cylinders seat 6 with the normal posture with the mountingbases damper cylinders damper cylinders plate 3 having a dimension slightly larger than the width of aseat plate section 6 a of theseat 6. - With the configuration as described above, the operator Q sitting on the
seat 6 is supported by thedamper cylinders seat 6 is securely supported with the simple supporting structure. - A swivel ring (rotating mechanism 4) is provided with the shaft center positioned at a central position of a line connecting centers supported by the
damper cylinders plate 3, and the movable supportingplate 5 is attached thereto with a supportingmember 4 b attached to the swivel ring so that the swivel ring can freely swivel. -
Slide mechanisms 41 each for adjusting an operator's position in the longitudinal direction as aposture adjusting section 40 and aheight adjusting mechanism 42 are provided on the movable supportingplate 5, and theseat 6 is attached thereto via theheight adjusting mechanism 42. - The
slide mechanisms 41 each extending in the longitudinal direction are arranged with a prespecified space in the lateral direction, and a mountingbase member 7 of theseat 6 is supported by the movable member. Theslide mechanism 41 has a known structure, and a movable member can intermittently move in the longitudinal direction thereon along a rail so that a position of the operator Q in the longitudinal direction can be adjusted. - The
height adjusting mechanism 42 having a known structure is provided on the mountingbase member 7, and aseat plate section 6 a of theseat 6 is attached with a known means to a seat mounting frame body above thisheight adjusting mechanism 42. Theheight adjusting mechanism 42 employed in the present invention can adjust a position in the vertical direction with cross links. It is to be noted that also theheight adjusting mechanism 42 not employing the cross links may be used in the present invention. - The
reference numerals console 8 is monolithically attached with a bracket to the mountingbase member 7, and can move in the vertical direction and swivel together with the operator'sseat 6 to allow for operations without requiring an operator to change the positional relation therewith. Thereference numeral 6 b in the figure indicates a backrest. - The operator's
seat supporting device 1 according to this embodiment is installed in an operator's cabin (not shown) of a service vehicle, and supports the operator'sseat 6 as described above. - The operator's
seat supporting device 1 having the configuration as described above according to this embodiment can set an operator's position in the longitudinal direction with theslide mechanisms 41 and the operator's height with theheight adjusting mechanism 42 respectively, when the operator adjusts the operating posture. - The two
damper cylinders seat 6. - Vibrations due to a shock or any other load from the outside during the operation are damped by the two
damper cylinders seat 6, and onedamper cylinder 50 has a function for controlling attenuation with an electromagnetic control section with a magnetic rheological fluid included therein, and with the configuration as described above, a signal from a sensor for detecting vibrations previously installed in an operator's cabin or on a machine frame is received by the controller, and a current is flown at a required rate to thecoil 61 b of thecontrol cylinder 60 according to an output signal generated by comparing the received signal to preset data, so that the vibrations are quickly damped by controlling the pressure difference generated between thefirst chamber 56 a and thesecond chamber 56 b in thebuffering cylinder 53 from thecontrol cylinder 60, thus the vibration-controlling function being provided. - The
other damper cylinder 30 has the function for dampening a shock by following the vibration controlling and buffering function of thedamper cylinder 50 with a cushioning function with thecoil spring 37 with themovable member 34 against the fixedmember 31 provided therein. Therefore, even when a large shock is applied thereto, vibrations can quickly be absorbed and dampened. - As for the vibration controlling action by the
damper cylinder 50, when vibrations are delivered from a vehicle's body, themovable member 54 displaces against the fixedmember 51 in the axis line direction. When themovable member 54, for example, moves in the downward direction of the vertical direction against the energizing force by thecoil spring 59,thecylinder member 54 a of themovable member 54 acts to push down the magnetic Theological fluid in thefirst chamber 56 a. - As shown in
FIG. 4 , the magnetic Theological fluid in thefirst chamber 56 a is pushed out into anupper side chamber 62 a of thecontrol cylinder 60 through the connectinghole 54 g, the connectingmember 66 and the connectinghole 65 by pushing down action of the magnetic rheological fluid. In this step, a reduced pressure state is generated in thesecond chamber 56 b of thebuffering cylinder 53, so that the magnetic Theological fluid is fed from alower side chamber 62 b of thecontrol cylinder 60 through the connectinghole 65, the connectingmember 66 and the connectinghole 54 g into thesecond chamber 56 b. - When the magnetic Theological fluid in the
first chamber 56 a is moved into theupper side chamber 62 a of thecontrol cylinder 60 in association with the downward movement of themovable member 54 in thebuffering cylinder 53, the pressure of thesecond chamber 56 b is reduced, so that the pressure of thelower side chamber 62 b of thecontrol cylinder 60 communicating thesecond chamber 56 b through the connectinghole 65, the connectingmember 66 and the thoughhole 54 g is also reduced. - Therefore, the
upper side chamber 62 a of thecontrol cylinder 60 enters the pressurized state, while thelower side chamber 62 b enters the reduced pressure state, so that the magnetic rheological fluid filled in theupper side chamber 62 a flows toward thelower side chamber 62 b due to the pressure difference. - In this step, a flow rate of the magnetic rheological fluid is restricted at the space S between the outer surface of the
clearance forming section 64 a and the inner surface of the cylindricalmain body 61, the space S separating theupper side chamber 62 a from thelower side chamber 62 b. - A vibration signal indicating vibrations of the fluid passing through the space S is sent from the sensor (not shown) to the controller, and the
coil 61 b is energized at a prespecified current rate based on preset data so that the magnetic field corresponding to the current is generated between theclearance forming section 64 a made of a magnetic material and the cylindricalmain body 61 with the flowing magnetic Theological fluid magnetized, thereby the magnetic rheological fluid being magnetized to change the viscosity. In other words, fluidity of the magnetic Theological fluid changes in proportion to intensity of the magnetic field. - When the
movable member 54 moves in the upward direction, the magnetic Theological fluid flows between thecontrol cylinder 60 and thebuffering cylinder 53 in the direction reverse to that in the operating sequence described above with the flow state controlled. - By changing the flow state of the magnetic rheological fluid as described above to change the flow resistance of the magnetic rheological fluid in flowing, the movement speed in the vertical direction of the
buffering cylinder 53 is controlled to dampen a shock loaded thereto. - In a case of an operator's seat in an operator's cabin provided in a bulldozer, when a large shock such as that experienced in running over a large rock or a projection, for instance, when a vehicle moves backward is loaded thereto, for dampening the vibrations caused by the shock, with the use of the above-described electromagnetic control section in the
control cylinder 60, by raising a rate of a current loaded from the controller to a level higher than that in the normal state to raise the intensity of a magnetic field generated between the cylindricalmain body 61 and theclearance forming section 64 a proportionately, the apparent viscosity of the magnetic rheological fluid flowing through the space S is made larger with the flow resistance at space S raised, so that the flow velocity of themovable member 54 is reduced. - In other words, the cushioning function of buffering a sudden and heavy shock with a soft buffering action provided by a soft spring action and also suppressing vibrations occurring after the shock is loaded by giving a damping force with the
control cylinder 60 is achieved in the present invention as described above. - Against the small and successive shocks experienced when driving on an irregular ground surface, by sending a control signal in the direction for lowering the intensity of a magnetic field from the controller to the
coil 61 b in response to a detection signal from the sensor to lower the magnetic flux density to the magnetic rheological fluid in thecontrol cylinder 60 with the electromagnetic control section, the flow resistance is reduced with the fluidity of the magnetic rheological fluid raised contrary to the case described above, so that a movement rate of themovable member 54 in the axial direction in thebuffering cylinder 53 is reduced, and therefore soft and smooth action for dampening vibrations is provided. - In contrast to the
damper cylinder 50 having the functions as described above, theother damper cylinder 30 has a supporting function with a simple structure including thecoil spring 37 for buffering therein, and performs the supporting function in association with actions of thedamper cylinder 50 as a damper cylinder supporting thewhole seat 6 leaving a main portion of the vibration-controlling function for dampening vibration to thedamper cylinder 50. - With the configuration, the
seat 6 is smoothly buffered against vibrations with the twodamper cylinders - As described above, the operator's
seat supporting device 1 according to this embodiment has the configuration in which vibrations are dampened with a vibration buffering device completely different and independent from the seatheight adjusting mechanism 42, so that adjustment in response to an operator's body weight is not required, and the efficient buffering function can be provided in the optimal state only by carrying out positional adjustment according to the operator's body type, thereby the operator performing required operations in the comfortable state. Further a wide space can be secured under an operator's feet, so that the problem of narrow space under the operator's feet as experienced in the supporting device based on the conventional technology can be eliminated, whereby there is provided the advantage that an operator can perform various operations in a relaxed and comfortable posture. - Next, referring to
FIG. 6 , a second embodiment of the present invention is described below. - In the present embodiment, it is only different from the operator's seat supporting device I according to the first embodiment that the structure of the damper cylinder 50 (damping function control mount cylinder) is modified. In the following, the description of the components have been described already or that of the same components as the above-described components will be omitted or simplified.
- The
damper cylinder 10 according to the second embodiment having a magnetic Theological fluid control function includes, as shown in the cross-sectional view inFIG. 6 , abuffering cylinder 13 externally and coaxially engaging a fixedmember 11 having a mountingbase 12 against the floor surface 2 (corresponding to the biaxial slide support structure according to the present invention), acoil spring 19 for restoring a damper provided inside the fixedmember 11, and a control cylinder 20 for a magnetic rheological fluid associated with thebuffering cylinder 13 and capable of controlling operations of thebuffering cylinder 13, and a mountingbase plate 18′ for mounting the supportingplate 3 thereon is provided on a top of thebuffering cylinder 13. - The
buffering cylinder 13 is a tubular cylinder including amovable member 14 provided outside and the fixedmember 11 provided inside and coaxially engaged therewith. Themovable member 14 has a thickcircular member 14 b connected to and integrated with an upper edge section of thecylinder member 14 a and also has acircular head member 14 c screwed into a lower edge section thereof, and controls an internal capacity of the cylinder to a prespecified value with an internal lower edge of thecircular member 14 b fixed to an upper edge section of thecylinder member 14 a and an internal upper edge of thehead member 14 c. - The
buffering cylinder 13 is slidably assembled with the fixedmember 11 with acircular projection 15 functioning as a piston integrally provided at an intermediate section of the fixedmember 11, and aseal ring 15 b is engaged in agroove section 15 a formed on an outer peripheral surface of thecircular projection 15 and contacts an internal surface of the movable member 14 (cylinder member 14 a) with afirst chamber 16 a and asecond chamber 16 b defined in front and at the back thereof. Aseal ring 16 d is engaged in each of thefirst chamber 16 a and thesecond chamber 16 b to restrict the fluid from leaking from the inside of the cylinder. - Bearing
bushes 17 guided by the fixedmember 11 are provided in thecircular member 14 b and thehead member 14 c each connected to themovable member 14 respectively, and with the bearingbushes 17 themovable member 14 can slide up and down being aligned with the center line and also accommodate a load applied to the supportingplate 3 in the stable state. Therefore the two bearingbushes seal member 17′ is provided in the engaging state at an outer side from the engaging position of the bearingbush 17 so that thechambers cap member 18 is screwed into thecircular member 14 b at a top section of thebuffering cylinder 13 having the configuration as described above, and a mountingbase plate 18′ for mounting the supportingplate 3 thereon is attached to thiscap member 18. - The control cylinder 20 has a
hole 22 with a prespecified internal diameter penetrating through amain body 21 with prespecified dimensions in the vertical direction and also has anupper cover member 23 and abottom cover member 23′ provided to close two edge sections of this penetratinghole 22. A supporting member consisting of acoil section 25 and asleeve 24 a is provided between theupper cover member 23 and thebottom cover member 23′, and the supporting member is so arranged that thecoil section 25 is located at an intermediate position of the supporting member supported by thesleeve 24 a made from a non-magnetic material with the upper and bottom sections engaged with the supporting member. - A slight clearance “a” is formed between an internal peripheral surface of the
main body 21 and an external peripheral surface of abobbin 25 a of thecoil section 25. Alead wire 27 extending over a controller not shown enabling electric control is connected to acoil 25 b of thecoil section 25, and thecoil 25 b is attached to thebobbin 25 a made of magnetic material as the core of a wire-wound section of thecoil section 25 with the small clearance “a” defined and maintained between thebobbins 25 a and an internal peripheral surface of the cylinder member 26 to form an electromagnetic control section causing a flow resistance of the magnetic Theological fluid. Themain body 21 is made from an electromagnetic soft iron for example so that a magnetic field is strongly formed only in the range of thebobbin 25 a. - In the
main body 21, connectingholes first chamber 16 a and thesecond chamber 16 b inside thecylinder member 14 a of thebuffering cylinder 13 are provided with appropriate spaces from the cylinder member 26 respectively so that the magnetic rheological fluid can flow from the control cylinder 20 to thebuffering cylinder 13. Further abuffering chamber 29 with gas such as the air included therein is provided at the top of the control cylinder 20 so that expansion of the magnetic rheological fluid due to temperature change can be accommodated. A magnetic rheological fluid (such as, for instance, iron carbonyl particles suspended in mineral oil as a carrier) is filled in each of the control cylinder 20 and thebuffering cylinder 13 each having the configuration as described above. - As shown in
FIG. 7 , the electromagnetic control section causing a flow resistance in the magnetic rheological fluid in the control cylinder 20 includes a cylinder member of the control cylinder 20 and thecoil section 25 provided therein, and also includes a known controller not shown and connected with thelead wire 27 to thecoil section 25. Thecoil section 25 is energized via the controller through thelead wire 27. - The electromagnetic control section controls a signal from a sensor for detecting vibration provided, for instance, in an operator's cabin not shown, and changes intensity of a magnetic flux generated between the
bobbin 25 a and themain body 21 by flowing a prespecified rate of electric current to thecoil section 25 according to an output signal therefrom, so that the electromagnetic control section can increase or reduce the flow resistance by changing the apparent viscosity (fluidity) of the magnetic rheological fluid within the magnetic field when the magnetic Theological fluid flows through the narrow clearance “a” formed between thebobbin 25 a and an internal wall of themain body 21 to control the vibration-controlling function. - Even when
such damper cylinder 10 according to the second embodiment is applied to the operator'sseat supporting device 1, the same advantages as that of the first embodiment can be obtained. - Next,
FIG. 8 is a cross-sectional view showing a third embodiment of a damping function control mount cylinder. - Basic configuration of the damping function control mount cylinder (described simply as a
damper cylinder 10A hereinafter) is the same as that in the embodiment described above, but the combinatorial structure is different from that in the embodiment described above. Therefore the basic actions and effects are the same as those described in the respective embodiments described above. It is to be noted that the same reference numerals are assigned to the same components as those in the embodiment described above and detailed description is omitted herefrom. Therefore description is made only to components having different functions respectively. - The
damper cylinder 10A according to this embodiment has a control cylinder 20A incorporated in and at a central position of thebuffering cylinder 13A. - Further a
coil spring 19A for restoration is provided between a mountingbase 12A provided outside thebuffering cylinder 13A and attached to a lower edge of the fixedmember 11A and a mountingbase plate 18 a provided at an upper edge of themovable member 14A. - The
buffering cylinder 13A includes the fixedmember 11A having the mountingbase 12A and themovable member 14A sliding in the axis line direction in the inner side therefrom, which are combined with each other. - The fixed
member 11A constituting thebuffering cylinder 13A has the mountingbase 12A in the lower section, and in the upper section, ahead member 11 b is screwed into and fixed to an upper edge section of thecylinder member 11 a which is a main body of the fixedmember 11A. - Further a
lower section member 11 c is fixed to a lower edge section of thecylinder member 11 a, and acircular projection 15A of themovable member 14A is slidably provided between an upper edge of thelower section member 11 c and a lower edge of thehead member 11 b, so that thefirst chamber 16 a is separated from thesecond chamber 16 b by thecircular projection 15A. - The
movable member 14A is a tubular body slidably and coaxially engaged in the fixedmember 11A, in which an upper edge section thereof protrudes by an appropriate length from an upper edge of the fixedmember 11A, and at the top, the mountingbase plate 18 a monolithically formed with a screwedcap 18A for supporting the supportingplate 3 is attached thereto, while a screw mountedcover 14 e is provided at the lower edge section to function as a piston and a rod. - The
circular projection 15A is provided on an external peripheral surface of the intermediate section of thismovable member 14A, and aseal ring 15 b is engaged in agroove section 15 a formed on the external peripheral surface and contacts an internal peripheral surface of thecylinder member 11 a of the fixedmember 11A to define athird chamber 16 f and afourth chamber 16 g in the cylinder. - The control cylinder 20A is coaxially provided and engaged in the
movable member 14A. - At a center of this control cylinder 20A, a supporting member consisting of a
coil section 25 and thesleeve 24 a is provided with a lower edge thereof engaged in and supported by ashaft supporting hole 14 f provided on a top surface of the screw mountedcover 14e and also with an upper edge thereof engaged in ashaft hole 14 f′ provided at a center of a bottom surface of a supportingpiece 14 h engaged in themovable member 14A, and further acylinder member 26A made from electromagnetic soft iron is concentrically provided outside the supporting member with both edges thereof held by the screw mountedcover 14 e and the supportingpiece 14 h. Thecoil section 25 is provided at the intermediate position with the upper and lower sections thereof supported by anon-magnetic sleeve 24 a with a slight clearance left with an internal peripheral surface of thecylinder member 26A made from electromagnetic soft iron. - A
bobbin 25 a made of a magnetic material are provided at the wire-winded section of thecoil section 25 so as to be the core of the wire-winded section, and a narrow clearance “a” is formed between thebobbin 25 a and an internal peripheral surface of thecylinder member 26A. Thelead wire 27 leading to a controller (not shown) through inside of the supporting member is connected to thecoil 25 b of thecoil section 25, and a required current is fed through thelead wire 27 under control by the controller. - An internal peripheral surface of the
circular projection 15B protruding inward from an internal peripheral section of themovable member 14A slidably contacts an external peripheral surface of thecylinder member 26A of the control cylinder 20A via aseal ring 15 d engaged in agroove section 15 c provided on the peripheral surface so as to be slidable, and thethird chamber 16 f and thefourth chamber 16 g partitioned in the vertical direction by thecircular projection 15B is formed between thecylinder member 26A and an internal peripheral surface of themovable member 14A. - A connecting
hole 14 j communicating to thefirst chamber 16 a and thethird chamber 16 f and a connectinghole 14 k communicating to thesecond chamber 16 b and the fourth chamber 14 g are provided above and under internal and externalcircular projections movable member 14A, and further a connectinghole 26 a communicating to thethird chamber 16 f and theupper side chamber 22 a inside the control cylinder 20A and a connectinghole 26 b communicating to thefourth chamber 16 g and thelower side chamber 22 b of the control cylinder 20A are provided in thecylinder member 26A respectively. - The chambers described above are filled with a magnetic rheological fluid. Further seal rings are provided at an upper edge section of an internal peripheral surface of the
head member 11 b positioned on the fixedmember 11A and at a lower edge section of an internal peripheral surface of thelower section member 11 c respectively to keep inside of the cylinder water-tight. - The
damper cylinder 10A having the configuration as described above is arranged like in the embodiment described above and is used to excite thecoil section 25 of the control cylinder 20A under control by the controller, and the functions are the same as those described in the embodiment above. - As for the flowing state of the magnetic rheological fluid, when the
movable member 14A is pushed down, thecircular projections buffering cylinder 13A, the fluid in thesecond chamber 16 b is pressurized and flows through the connectinghole 14 k into thefourth chamber 16 g, and is further fed from thisfourth chamber 16 g through the connectinghole 26 b into thelower side chamber 22 b of the control cylinder 20A. In contrast, thefirst chamber 16 a and thethird chamber 16 f in thebuffering cylinder 13A enter the reduced pressure state, so that the fluid in theupper side chamber 22 a of the control cylinder 20A passing through the connectinghole 14j flows from thethird chamber 16 f into thefirst chamber 16 a due to a pressure difference. - In the control cylinder 20A, the magnetic rheological fluid flows from the
lower side chamber 22 b through the clearance “a” into theupper side chamber 22 a due to a pressure difference between thelower side chamber 22 b and theupper side chamber 22 a. - With the configuration, movement velocity of the
buffering cylinder 13A is controlled by controlling a signal from a detection sensor (not shown), which is provided in the machine side against the magnetic rheological fluid and detects vibrations of the magnetic rheological fluid passing through the clearance “a”, with the controller based on data to feed a current at a required rate through thelead wire 27 to thecoil section 25 and generate a magnetic field corresponding to the current value around thebobbin 25 a for the purpose to change fluidity of the magnetic Theological fluid to control the flow resistance. - The descriptions above assume the configuration in which two units of damper cylinders are employed to support an operator's seat, but the present invention is not limited to this configuration, and for instance, another additional damper cylinder for supporting may be provided in the front side or in the rear side, if necessary. With the configuration, even when a large load is applied to the front side or the rear side of the operator's seat, the load can be accommodated and dampened.
Claims (6)
1. An operator's seat supporting device for a service vehicle, wherein at least biaxially supported by damper cylinders each are arranged along an axial line parallel to a vertical line passing through a shoulder of an operator sitting on a seat, and the operator's seat supporting device includes a posture adjusting mechanism provided by the sections supported by the damper cylinders and the seat.
2. An operator's seat supporting device for a service vehicle, wherein an operator's seat is mounted via a posture adjusting mechanism on a supporting plate supported by at least two damper cylinders at a place where an operator's seat is installed, and at least one of the damper cylinders reduces vibrations by making use of a magnetic rheological fluid.
3. The operator's seat supporting device for a service vehicle according to claim 2 , wherein, in the damper cylinder for reducing vibrations by making use of the magnetic rheological fluid, a buffering cylinder and a control cylinder for controlling vibrations with the magnetic rheological fluid are monolithically formed.
4. The operator's seat supporting device for a service vehicle according to claim 2 , wherein the damper cylinder has a biaxial slide supporting structure, and a coil spring is provided in the inner side or in the outer side from a shaft body having dual-shafts.
5. The operator's seat supporting device for a service vehicle according to claim 3 , wherein the damper cylinder has a biaxial slide supporting structure, and a coil spring is provided in the inner side or in the outer side from a shaft body having dual-shafts.
6. The operator's seat supporting device for a service vehicle according to claim 2 , wherein an operator's seat rotating mechanism is provided on the supporting plate supported by the damper cylinders.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-299132 | 2003-08-22 | ||
JP2003299132 | 2003-08-22 |
Publications (1)
Publication Number | Publication Date |
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US20050073184A1 true US20050073184A1 (en) | 2005-04-07 |
Family
ID=34385919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/922,268 Abandoned US20050073184A1 (en) | 2003-08-22 | 2004-08-19 | Operator's seat supporting device for service vehicle |
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Country | Link |
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US (1) | US20050073184A1 (en) |
Cited By (13)
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US20060061177A1 (en) * | 2004-09-23 | 2006-03-23 | Billger Steven C | Systems and methods for seat repositioning |
US20060061178A1 (en) * | 2004-09-23 | 2006-03-23 | Billger Steven C | Seat repositioning device with release on control handle |
US20060061122A1 (en) * | 2004-09-23 | 2006-03-23 | Billger Steven C | Rotating and swiveling seat |
US20060255622A1 (en) * | 2005-04-29 | 2006-11-16 | Crown Equipment Corporation | Suspended floorboard |
AU2008202395B1 (en) * | 2008-05-30 | 2009-01-08 | Muddie's Holdings Pty Ltd | An Improved Boat Seat Support |
US20100152978A1 (en) * | 2008-12-15 | 2010-06-17 | Caterpillar, Inc. | Machine Employing Cab Mounts and Method for Controlling Cab Mounts to Maintain Snubbing Height and Provide Mount Diagnostics |
US20110127819A1 (en) * | 2009-03-04 | 2011-06-02 | Komatsu Ltd. | Operator Seat Structure of Construction Machine |
WO2013158481A1 (en) * | 2012-04-17 | 2013-10-24 | Bose Corporation | Active suspension seat and vehicle operation interlocks |
AU2013200661B1 (en) * | 2008-05-30 | 2014-08-14 | Muddie's Holdings Pty Ltd | A Seat Support Assembly |
EP2857598A1 (en) * | 2013-09-24 | 2015-04-08 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Construction machine |
US9707865B1 (en) * | 2016-05-04 | 2017-07-18 | Deere & Company | Operator seat swivel with arm release |
US20180105082A1 (en) * | 2016-10-17 | 2018-04-19 | Bose Corporation | Active Vibration Isolation System |
US10046677B2 (en) | 2013-04-23 | 2018-08-14 | Clearmotion Acquisition I Llc | Seat system for a vehicle |
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US20060061178A1 (en) * | 2004-09-23 | 2006-03-23 | Billger Steven C | Seat repositioning device with release on control handle |
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AU2013200661B1 (en) * | 2008-05-30 | 2014-08-14 | Muddie's Holdings Pty Ltd | A Seat Support Assembly |
US20100152978A1 (en) * | 2008-12-15 | 2010-06-17 | Caterpillar, Inc. | Machine Employing Cab Mounts and Method for Controlling Cab Mounts to Maintain Snubbing Height and Provide Mount Diagnostics |
US20110127819A1 (en) * | 2009-03-04 | 2011-06-02 | Komatsu Ltd. | Operator Seat Structure of Construction Machine |
US8465094B2 (en) | 2009-03-04 | 2013-06-18 | Komatsu Ltd. | Operator seat structure of construction machine |
WO2013158481A1 (en) * | 2012-04-17 | 2013-10-24 | Bose Corporation | Active suspension seat and vehicle operation interlocks |
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WO2014121322A1 (en) * | 2013-02-07 | 2014-08-14 | Muddie's Holdings Pty Ltd | A seat support assembly |
US10046677B2 (en) | 2013-04-23 | 2018-08-14 | Clearmotion Acquisition I Llc | Seat system for a vehicle |
US10245984B2 (en) | 2013-04-23 | 2019-04-02 | ClearMotion Acquisition LLC | Seat system for a vehicle |
EP2857598A1 (en) * | 2013-09-24 | 2015-04-08 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Construction machine |
US9399855B2 (en) | 2013-09-24 | 2016-07-26 | Kobe Steel, Ltd. | Construction machine |
US9707865B1 (en) * | 2016-05-04 | 2017-07-18 | Deere & Company | Operator seat swivel with arm release |
US20180105082A1 (en) * | 2016-10-17 | 2018-04-19 | Bose Corporation | Active Vibration Isolation System |
US10675999B2 (en) * | 2016-10-17 | 2020-06-09 | Clearmotion Acquisition I Llc | Active vibration isolation system |
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