US2785710A - Automatic brake for power tools - Google Patents
Automatic brake for power tools Download PDFInfo
- Publication number
- US2785710A US2785710A US427220A US42722054A US2785710A US 2785710 A US2785710 A US 2785710A US 427220 A US427220 A US 427220A US 42722054 A US42722054 A US 42722054A US 2785710 A US2785710 A US 2785710A
- Authority
- US
- United States
- Prior art keywords
- motor
- tool
- solenoid
- cutting tool
- members
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/2245—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members in which the common actuating member acts on two levers carrying the braking members, e.g. tong-type brakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
- B27B5/29—Details; Component parts; Accessories
- B27B5/38—Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
- F16D59/02—Self-acting brakes, e.g. coming into operation at a predetermined speed spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/20—Electric or magnetic using electromagnets
- F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/081—With randomly actuated stopping means
- Y10T83/099—Manually operated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/121—With means to accomplish delayed stopping after cessation of cyclic operation
Definitions
- AUTOMATIC BRAKE FOR POWER TOOLS Filed may 3. 1954 fawn/vs TOOL ENTOR INV F
- This invention relates to an improved brake for a power saw, particularly a circular power saw.
- the saw In many circular power sa-ws, the saw is mounted directly on the motor arbor and operates at a relatively high R. P. M. When the power is turned off, the motor and saw continue to coast, presenting a safety hazard since an operator is apt to be careless when the power is oil". Furthermore, there is a time loss where one must Wait for the blade to stop before making adjustments.
- brake means should be provided so that motor and blade may be stopped simultaneously with turning off the power. Accordingly, it is my invention to provide an automatic braking means engaging the circular blade itself.
- 1 show a motor 1% driving a rotating shaft 12 supporting a woodworking tool such as a saw blade 14 secured thereon.
- the saw blade guard 16 is secured to the motor by fastening means 18.
- the guard 16 has the oppositely facing bores 26 formed in its side walls 22.
- the flange cylinders 24 are secured in bores 20. These cylinders 24 are adapted to hold the spring-loaded pistons 26 which are urged by the compression springs 28 toward the blade or tool 14.
- a piston shaft 3% protrudes through and slidingly engages a bore 32 formed in the head of each cylinder 24.
- a doubleacting solenoid or electromagnet 42 having armature plungers 44.
- solenoid 42 When solenoid 42 is activated, the plungers 44 retract longitudinally toward each other into the solenoid.
- a lever 34 pivotally fulcrumed on lugs 36 secured to guard 16 connects the ends of plungers 44 to the outw wardly extending ends of piston shafts 39.
- the solenoid 42 is connected across the terminals 11 of motor 14 so as to be energized when switch 13, connected in series between power lines and motor 19, is closed so as to cause operating current to pass through the motor windings (Fig. 2).
- switch 13 connected in series between power lines and motor 19, is closed so as to cause operating current to pass through the motor windings (Fig. 2).
- a guard mounted on said motor and about a portion of said cutting tool, said guard having a cylinder positioned longitudinally parallel to the armature of said motor, a piston movable to and fro in said cylinder, a brake shoe secured on one end of said piston to engage said rotary cutting tool when said piston is moved to the forward end of said cylinder, resilient means to urge said piston to said forward end of said cylinder and into braking contact with said rotary tool, a solenoid mounted on said guard, a fulcrumed lever connecting said solenoid to said piston, said solenoid and said lever being operatively positioned to move said piston against said resilient member and out of braking position when said solenoid is energized and means connecting said solenoid across the terminals of said electric motor to energize said solenoid when said motor is energized whereby said braking means may be moved by said resilient means into braking position when said motor is de-
- a bracket mounted about the edge of said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, and a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one end of said double acting solenoid and at its other end to one of said movable members to move said members against said yielding means and out of frictional engagement with said cutting tool.
- a bracket mounted about the edge of said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one end of said double acting solenoid and at its other end to one of said movable members to move said members against said yielding means and out of frictional engagement with said cutting tool, and an electrical conductor operatively connected to said solenoid and to said motor to energize said solenoid when said motor is in operation.
- a guard mounted about a portion of said rotary tool, a brake shoe mounted on said guard on each side .of said tool movable from a tool engaging position to a non-engaging position, means to move said brake shoes into tool engaging position, a single electro-magnetic means to move said brake shoes out of tool engaging position, and single switch means operative when plosed to pant es; said, motor and said eleetrotnagnetic means to said source of power whereby said brake shoes are uniformly moved out of engaging position during the operation of said motor and uniformly released into braking position when said switch means is opened to stop said motor.
Description
March 19, 1957 J, ow JR 2;785,7l0
AUTOMATIC BRAKE FOR POWER TOOLS Filed may 3. 1954 fawn/vs TOOL ENTOR INV F|G.i JESSE R. MOWERY,JR.
H will.
United States Patent 7 2,785,710 7 AUTOMATIC BRAKE FOR POWER TOOLS Jesse R. Mowery, In, Lancaster, Pa., assignor to De Walt Inc., a corporation of Pennsylvania Application May 3, 1954, Serial No. 427,22i
Claims. (Cl. 143-157) This invention relates to an improved brake for a power saw, particularly a circular power saw.
In many circular power sa-ws, the saw is mounted directly on the motor arbor and operates at a relatively high R. P. M. When the power is turned off, the motor and saw continue to coast, presenting a safety hazard since an operator is apt to be careless when the power is oil". Furthermore, there is a time loss where one must Wait for the blade to stop before making adjustments.
It has accordingly long been recognized that brake means should be provided so that motor and blade may be stopped simultaneously with turning off the power. Accordingly, it is my invention to provide an automatic braking means engaging the circular blade itself.
It is another object of my invention to apply a brake to the blade itself to prevent throw off.
It is a further object of my invention that the brake is always applied when the power is off.
The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims. My invention itself, however, both as to its organization and method of operation may be understood by reference to the apparatus embodying my invention and shown in the accompanying drawing in which 1 illustrate a side elevation, partly, in section, of a power driven rotary tool in conjunction with an automatic braking device.
With reference to the drawing, 1 show a motor 1% driving a rotating shaft 12 supporting a woodworking tool such as a saw blade 14 secured thereon. The saw blade guard 16 is secured to the motor by fastening means 18. The guard 16 has the oppositely facing bores 26 formed in its side walls 22. The flange cylinders 24 are secured in bores 20. These cylinders 24 are adapted to hold the spring-loaded pistons 26 which are urged by the compression springs 28 toward the blade or tool 14. A piston shaft 3% protrudes through and slidingly engages a bore 32 formed in the head of each cylinder 24.
There is secured to the bight 4d of guard 16 a doubleacting solenoid or electromagnet 42 having armature plungers 44. When solenoid 42 is activated, the plungers 44 retract longitudinally toward each other into the solenoid. A lever 34 pivotally fulcrumed on lugs 36 secured to guard 16 connects the ends of plungers 44 to the outw wardly extending ends of piston shafts 39.
In operation, the solenoid 42 is connected across the terminals 11 of motor 14 so as to be energized when switch 13, connected in series between power lines and motor 19, is closed so as to cause operating current to pass through the motor windings (Fig. 2). When so energized the armature shaft-s 44 are moved toward each other, rocking the lever 34 to move pistons 26 and brake shoes 27 against the thrust of compression springs 28 and away from the tool 14.
When, on the other hand, the power is turned oif, the solenoid 42 is de-energized and the springs 28 thrust pistons 26 and brake shoes 27 against the sides of tool 14 with braking force. By applying the brake to the blade itself I prevent a possible throw off which might occur where a braking force is applied to the motor 10 or motor shaft 12 itself.
Having described a working embodiment of my invention, I claim:
1. In combination with a power-driven rotary cutting tool having an electric motor and cutting tool mounted on the armature shaft of said motor, a guard mounted on said motor and about a portion of said cutting tool, said guard having a cylinder positioned longitudinally parallel to the armature of said motor, a piston movable to and fro in said cylinder, a brake shoe secured on one end of said piston to engage said rotary cutting tool when said piston is moved to the forward end of said cylinder, resilient means to urge said piston to said forward end of said cylinder and into braking contact with said rotary tool, a solenoid mounted on said guard, a fulcrumed lever connecting said solenoid to said piston, said solenoid and said lever being operatively positioned to move said piston against said resilient member and out of braking position when said solenoid is energized and means connecting said solenoid across the terminals of said electric motor to energize said solenoid when said motor is energized whereby said braking means may be moved by said resilient means into braking position when said motor is de-energized and said braking means may be moved out of braking position when said motor is energized.
2. In a cutting mach ne having a motor and a rotary cutting tool, a bracket mounted about the edge of said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, and a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one end of said double acting solenoid and at its other end to one of said movable members to move said members against said yielding means and out of frictional engagement with said cutting tool.
3. in a cutting machine having a motor and a rotary cutting tool, a bracket mounted about the edge of said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one end of said double acting solenoid and at its other end to one of said movable members to move said members against said yielding means and out of frictional engagement with said cutting tool, and an electrical conductor operatively connected to said solenoid and to said motor to energize said solenoid when said motor is in operation.
4. in a cutting machine having an electric motor and a rotary cutting tool, a bracket mounted about the edge or" said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one 5. The combination with a power driven rotary cutting tool having an electric motor and a source of elec:
tnic power, a guardmounted about a portion of said rotary tool, a brake shoe mounted on said guard on each side .of said tool movable from a tool engaging position to a non-engaging position, means to move said brake shoes into tool engaging position, a single electro-magnetic means to move said brake shoes out of tool engaging position, and single switch means operative when plosed to pant es; said, motor and said eleetrotnagnetic means to said source of power whereby said brake shoes are uniformly moved out of engaging position during the operation of said motor and uniformly released into braking position when said switch means is opened to stop said motor.
References Cited the tile of this patent UNITED STATES PATENTS 1,282,483 Steen Oct. 22, 1918 1,811,066 Tannewitz a y a June 23, 193 1 FQREIGN PATENTS 485,143 Germany Nov. 27, 1929
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US427220A US2785710A (en) | 1954-05-03 | 1954-05-03 | Automatic brake for power tools |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US427220A US2785710A (en) | 1954-05-03 | 1954-05-03 | Automatic brake for power tools |
Publications (1)
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US2785710A true US2785710A (en) | 1957-03-19 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US427220A Expired - Lifetime US2785710A (en) | 1954-05-03 | 1954-05-03 | Automatic brake for power tools |
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Cited By (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2801714A (en) * | 1956-06-29 | 1957-08-06 | Meadville Res Products Corp | Heat insulating friction shoe and piston unit |
US2960190A (en) * | 1959-02-24 | 1960-11-15 | Molon Motor & Coil Corp | Motor brake |
US2984268A (en) * | 1958-07-07 | 1961-05-16 | George E Vuichard | Manually-actuated saw brake |
US3103990A (en) * | 1960-11-01 | 1963-09-17 | Thomas J Pierson | Hydraulic disc brake |
US3124219A (en) * | 1964-03-10 | Disc brake assembly | ||
US3184003A (en) * | 1961-05-15 | 1965-05-18 | Lambert & Brake Corp | Brake structure |
US3322240A (en) * | 1965-03-19 | 1967-05-30 | Mallory & Co Inc P R | Disc brake for washing machine |
US3417843A (en) * | 1966-10-26 | 1968-12-24 | Ingersoll Rand Canada | Disc brake for mine hoists |
US3703654A (en) * | 1971-06-30 | 1972-11-21 | Ralph Karubian | Hand tool with magnetic brake |
US4145940A (en) * | 1978-01-26 | 1979-03-27 | Woloveke Eugene L | Brake apparatus for a motor driven saw blade |
DE2952253A1 (en) * | 1979-01-12 | 1980-07-24 | Asahi Seimitsu Kk | PRESETABLE BRAKE DEVICE FOR A DRAWING MACHINE |
EP0042918A1 (en) * | 1980-06-28 | 1982-01-06 | Robert Bosch Gmbh | Hand tool operated by an electric motor |
US4335514A (en) * | 1980-08-08 | 1982-06-22 | Black & Decker Inc. | Switch-brake interlock for chain saw |
EP0465831A1 (en) * | 1990-07-12 | 1992-01-15 | Inventio Ag | Safety disc brake for elevators |
DE19750819A1 (en) * | 1997-11-17 | 1999-05-20 | Kocks Technik | Tube and long stock cutting machine using powered disc tool |
US6092448A (en) * | 1997-01-17 | 2000-07-25 | Premark Feg L.L.C. | Slicer with staged dynamic braking system |
US20020017184A1 (en) * | 2000-08-14 | 2002-02-14 | Gass Stephen F. | Table saw with improved safety system |
US20030005588A1 (en) * | 2001-07-03 | 2003-01-09 | Gass Stephen F. | Actuators for use in fast-acting safety systems |
US6813983B2 (en) | 2000-09-29 | 2004-11-09 | Sd3, Llc | Power saw with improved safety system |
US6826988B2 (en) | 2000-09-29 | 2004-12-07 | Sd3, Llc | Miter saw with improved safety system |
US6945148B2 (en) | 2000-09-29 | 2005-09-20 | Sd3, Llc | Miter saw with improved safety system |
US20050204885A1 (en) * | 2002-01-14 | 2005-09-22 | Gass Stephen F | Miter saw with improved safety system |
US6957601B2 (en) | 2000-08-14 | 2005-10-25 | Sd3, Llc | Translation stop for use in power equipment |
US6994004B2 (en) | 2000-09-29 | 2006-02-07 | Sd3, Llc | Table saw with improved safety system |
US7000514B2 (en) | 2001-07-27 | 2006-02-21 | Sd3, Llc | Safety systems for band saws |
US7077039B2 (en) | 2001-11-13 | 2006-07-18 | Sd3, Llc | Detection system for power equipment |
US20060159539A1 (en) * | 2005-01-19 | 2006-07-20 | The Boeing Company (De Corporation) | Automatic position-locking tool carrier apparatus and method |
US7197969B2 (en) | 2001-09-24 | 2007-04-03 | Sd3, Llc | Logic control with test mode for fast-acting safety system |
US7231856B2 (en) | 2001-06-13 | 2007-06-19 | Sd3, Llc | Apparatus and method for detecting dangerous conditions in power equipment |
US20070186737A1 (en) * | 1999-10-01 | 2007-08-16 | Gass Stephen F | Brake mechanism for power equipment |
US20070240786A1 (en) * | 2000-08-14 | 2007-10-18 | Gass Stephen F | Motion detecting system for use in a safety system for power equipment |
US20080092702A1 (en) * | 2000-08-14 | 2008-04-24 | Gass Stephen F | Spring-biased brake mechanism for power equipment |
US7377199B2 (en) | 2000-09-29 | 2008-05-27 | Sd3, Llc | Contact detection system for power equipment |
JP2008281138A (en) * | 2007-05-11 | 2008-11-20 | Kayaba Ind Co Ltd | Caliper brake device for railway rolling stock |
US7481140B2 (en) | 2005-04-15 | 2009-01-27 | Sd3, Llc | Detection systems for power equipment |
US7610836B2 (en) | 2000-08-14 | 2009-11-03 | Sd3, Llc | Replaceable brake mechanism for power equipment |
US7644645B2 (en) | 2002-01-16 | 2010-01-12 | Sd3, Llc | Apparatus and method for detecting dangerous conditions in power equipment |
US20100089212A1 (en) * | 2000-08-14 | 2010-04-15 | Gass Stephen F | Logic control for fast-acting safety system |
US7707920B2 (en) | 2003-12-31 | 2010-05-04 | Sd3, Llc | Table saws with safety systems |
US7784507B2 (en) | 2000-09-29 | 2010-08-31 | Sd3, Llc | Router with improved safety system |
US7827890B2 (en) | 2004-01-29 | 2010-11-09 | Sd3, Llc | Table saws with safety systems and systems to mount and index attachments |
US7832314B2 (en) | 2000-08-14 | 2010-11-16 | Sd3, Llc | Brake positioning system |
US7836804B2 (en) | 2003-08-20 | 2010-11-23 | Sd3, Llc | Woodworking machines with overmolded arbors |
US7895927B2 (en) | 1999-10-01 | 2011-03-01 | Sd3, Llc | Power equipment with detection and reaction systems |
US7991503B2 (en) | 2003-12-31 | 2011-08-02 | Sd3, Llc | Detection systems for power equipment |
US8061245B2 (en) | 2000-09-29 | 2011-11-22 | Sd3, Llc | Safety methods for use in power equipment |
US8065943B2 (en) | 2000-09-18 | 2011-11-29 | Sd3, Llc | Translation stop for use in power equipment |
US8100039B2 (en) | 2000-08-14 | 2012-01-24 | Sd3, Llc | Miter saw with safety system |
US8459157B2 (en) | 2003-12-31 | 2013-06-11 | Sd3, Llc | Brake cartridges and mounting systems for brake cartridges |
US9724840B2 (en) | 1999-10-01 | 2017-08-08 | Sd3, Llc | Safety systems for power equipment |
US9927796B2 (en) | 2001-05-17 | 2018-03-27 | Sawstop Holding Llc | Band saw with improved safety system |
US11098849B2 (en) | 2016-05-31 | 2021-08-24 | Sawstop Holding Llc | Detection systems for power tools with active injury mitigation technology |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1168355A (en) * | 1910-02-07 | 1916-01-18 | Alvey Ferguson Co | Electric bone-saw. |
US1282483A (en) * | 1916-10-02 | 1918-10-22 | Allis Chalmers Mfg Co | Compound band-brake. |
DE485143C (en) * | 1929-11-27 | Wilhelm Follender Grossfeld | Brake pad attachment | |
US1811066A (en) * | 1929-02-23 | 1931-06-23 | Carl E Tannewitz | Sawing machine |
-
1954
- 1954-05-03 US US427220A patent/US2785710A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE485143C (en) * | 1929-11-27 | Wilhelm Follender Grossfeld | Brake pad attachment | |
US1168355A (en) * | 1910-02-07 | 1916-01-18 | Alvey Ferguson Co | Electric bone-saw. |
US1282483A (en) * | 1916-10-02 | 1918-10-22 | Allis Chalmers Mfg Co | Compound band-brake. |
US1811066A (en) * | 1929-02-23 | 1931-06-23 | Carl E Tannewitz | Sawing machine |
Cited By (98)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124219A (en) * | 1964-03-10 | Disc brake assembly | ||
US2801714A (en) * | 1956-06-29 | 1957-08-06 | Meadville Res Products Corp | Heat insulating friction shoe and piston unit |
US2984268A (en) * | 1958-07-07 | 1961-05-16 | George E Vuichard | Manually-actuated saw brake |
US2960190A (en) * | 1959-02-24 | 1960-11-15 | Molon Motor & Coil Corp | Motor brake |
US3103990A (en) * | 1960-11-01 | 1963-09-17 | Thomas J Pierson | Hydraulic disc brake |
US3184003A (en) * | 1961-05-15 | 1965-05-18 | Lambert & Brake Corp | Brake structure |
US3322240A (en) * | 1965-03-19 | 1967-05-30 | Mallory & Co Inc P R | Disc brake for washing machine |
US3417843A (en) * | 1966-10-26 | 1968-12-24 | Ingersoll Rand Canada | Disc brake for mine hoists |
US3703654A (en) * | 1971-06-30 | 1972-11-21 | Ralph Karubian | Hand tool with magnetic brake |
US4145940A (en) * | 1978-01-26 | 1979-03-27 | Woloveke Eugene L | Brake apparatus for a motor driven saw blade |
DE2952253A1 (en) * | 1979-01-12 | 1980-07-24 | Asahi Seimitsu Kk | PRESETABLE BRAKE DEVICE FOR A DRAWING MACHINE |
US4315371A (en) * | 1979-01-12 | 1982-02-16 | Asahi Seimitsu Kabushiki Kaisha | Preset brake device for line drawing machine, drafting machine or like |
EP0042918A1 (en) * | 1980-06-28 | 1982-01-06 | Robert Bosch Gmbh | Hand tool operated by an electric motor |
US4335514A (en) * | 1980-08-08 | 1982-06-22 | Black & Decker Inc. | Switch-brake interlock for chain saw |
EP0465831A1 (en) * | 1990-07-12 | 1992-01-15 | Inventio Ag | Safety disc brake for elevators |
TR25159A (en) * | 1990-07-12 | 1992-11-01 | Inventio Ag | SAFE DISC BRAKE FOR ELEVATORS |
US5253738A (en) * | 1990-07-12 | 1993-10-19 | Inventio Ag | Safety disc brake for lifts |
US6092448A (en) * | 1997-01-17 | 2000-07-25 | Premark Feg L.L.C. | Slicer with staged dynamic braking system |
DE19750819A1 (en) * | 1997-11-17 | 1999-05-20 | Kocks Technik | Tube and long stock cutting machine using powered disc tool |
US8196499B2 (en) | 1999-10-01 | 2012-06-12 | Sd3, Llc | Power equipment with detection and reaction systems |
US10335972B2 (en) | 1999-10-01 | 2019-07-02 | Sawstop Holding Llc | Table Saws |
US9969014B2 (en) | 1999-10-01 | 2018-05-15 | Sawstop Holding Llc | Power equipment with detection and reaction systems |
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US20100213018A1 (en) * | 1999-10-01 | 2010-08-26 | Gass Stephen F | Brake mechanism for power equipment |
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US20070186737A1 (en) * | 1999-10-01 | 2007-08-16 | Gass Stephen F | Brake mechanism for power equipment |
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US20100089212A1 (en) * | 2000-08-14 | 2010-04-15 | Gass Stephen F | Logic control for fast-acting safety system |
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US20100132523A1 (en) * | 2000-08-14 | 2010-06-03 | Gass Stephen F | Replaceable brake mechanism for power equipment |
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US20030005588A1 (en) * | 2001-07-03 | 2003-01-09 | Gass Stephen F. | Actuators for use in fast-acting safety systems |
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US20100257988A1 (en) * | 2002-01-14 | 2010-10-14 | Gass Stephen F | Miter saw with improved safety system |
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US10052786B2 (en) | 2004-01-29 | 2018-08-21 | Sawstop Holding Llc | Table saws with safety systems and systems to mount and index attachments |
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US20060159539A1 (en) * | 2005-01-19 | 2006-07-20 | The Boeing Company (De Corporation) | Automatic position-locking tool carrier apparatus and method |
US7112018B2 (en) | 2005-01-19 | 2006-09-26 | The Boeing Company | Automatic position-locking tool carrier apparatus and method |
US7481140B2 (en) | 2005-04-15 | 2009-01-27 | Sd3, Llc | Detection systems for power equipment |
JP2008281138A (en) * | 2007-05-11 | 2008-11-20 | Kayaba Ind Co Ltd | Caliper brake device for railway rolling stock |
JP4728279B2 (en) * | 2007-05-11 | 2011-07-20 | カヤバ工業株式会社 | Caliper brake device for railway vehicles |
US11098849B2 (en) | 2016-05-31 | 2021-08-24 | Sawstop Holding Llc | Detection systems for power tools with active injury mitigation technology |
US11940095B2 (en) | 2016-05-31 | 2024-03-26 | Sawstop Holding Llc | Detection systems for power tools with active injury mitigation technology |
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