US20090156105A1 - Hand-held power tool - Google Patents
Hand-held power tool Download PDFInfo
- Publication number
- US20090156105A1 US20090156105A1 US12/287,639 US28763908A US2009156105A1 US 20090156105 A1 US20090156105 A1 US 20090156105A1 US 28763908 A US28763908 A US 28763908A US 2009156105 A1 US2009156105 A1 US 2009156105A1
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- US
- United States
- Prior art keywords
- locking
- protective hood
- housing
- stirrup
- power tool
- 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.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
- B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
- B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
Definitions
- the present invention relates to a hand-held power tool for driving cutting or grinding working tools.
- Hand-held power tools of the type described above such as, e.g., angle grinder, have a circular disc-shaped cutting or grinding working tool rotatable during operation and used, e.g., for forming cuts in constructional components or for grinding surfaces of constructional components.
- the cutting or grinding working tool is covered circumferentially at least partially with a protective hood.
- German Publication DE 39 21 772 A1 discloses a hand-held power tool which is formed as an angle grinder and includes a protective hood releasably mounted on the power tool housing.
- the housing in the region of the drive spindle exit, has a locking and holding device for securing the protective hood on the housing.
- the clamping stirrup is arranged about the spindle and receives an annular flange of the protective hood which is forcelockingly and frictionally secured in the clamping stirrup.
- the protective hood is not formlockingly secured against rotation.
- German Publication DE 102 59 520 A1 discloses a hand-held power tool for a rotational disc-shaped working tool having a housing from which a drive spindle projects for mounting a working tool thereon and on which a hollow cylindrical locking neck, coaxial with the drive spindle, is formed.
- a protective hood for at least partially covering the working tool is releasably mounted on the housing.
- the protective hood is mounted on the locking neck and is secured thereon by a clamping stirrup provided with locking screws.
- the clamping stirrup is pivotally mounted on the locking neck and is retained there with manually releasable locking means arranged between the locking neck and the clamping stirrup and independent of the locking screws.
- the drawback here consists in that several expensive operational steps are necessary for mounting the protective hood and fixedly securing it against rotation.
- An object of the present invention is to provide a hand-held power tool in which the drawbacks of known hand-held power tools are eliminated, and the protective hood is securable on the housing against rotation relative thereto in a constructively simple way.
- a hand-held power tool for driving a cutting or grinding working tool and including a housing, a drive spindle extending from the housing for mounting the working tool thereon, a protective hood for at least partially covering the working tool and securable on the housing, and a locking and holding device for releasably securing the protective hood on the housing and having a clamping stirrup for securing the protective hood and having a variable stirrup width, and a tensioning lever mechanism having a tensioning lever for operating the clamping stirrup and displaceable between a first position in which the clamping stirrup is released and has a first stirrup width, and a second position in which the clamping stirrup is tensioned and has a second stirrup width smaller than the first stirrup width, and a locking spring radially displaceable by the tensioning lever and having at least one locking nose for retaining the protective hood on the housing without a possibility
- the present invention insures fixing of the protective hood on the housing and securing of the mounted protective hood against rotation relative to the housing without any auxiliary tool or tools in a single operational step, with the locking and holding device requiring only one additional component for forming the locking mechanism.
- “against rotation,” means not only that no pivotal movement relative to the housing becomes possible but rather that any rotation relative to the housing (about the drive spindle axis) is prevented.
- the clamping stirrup and the tensioning lever mechanism are fixedly secured on the housing and the protective hood has counter-locking means engageable, in the second position of the tensioning lever, by the at least one nose of the locking spring for retaining the protective hood on the housing without a possibility of rotation relative thereto.
- the working and protective region is not limited in any way as the protective hood is rotatable by 360°. Because the protective hood has no interfering operational handle, a further advantage consists in that in each position, a maximal cut depth is available.
- the tensioning lever mechanism includes a tensioning member connectable with the locking spring (a toggle lever design), with the locking spring being arranged on the tensioning member.
- the locking spring can be mounted on the tensioning member in a technically simple manner, by simply being pushed on the tensioning member. Because the tensioning member is displaced radially when the tensioning lever is displaced from its first position (release position of the clamping stirrup) to its second position (tensioning position of the clamping stirrup) and vice versa, the tensioning member is particular suitable as a carrier of the locking nose of the locking spring.
- the locking spring is formed as a leaf spring, so that the transition of the tensioning lever mechanism from a release position of the clamping stirrup into tensioning position of the clamping stirrup is also possible when the locking nose is not engageable with the counter-locking means of the protective hood.
- the engagement can be effected, e.g., later by rotating the protective hood relative to the housing, so that the locking nose automatically is displaced in its locking position by the biasing force of the leaf spring.
- the tensioning member is formed integrally with the leaf spring.
- the tensioning member can be, e.g., economically formed as a stamped and bent part.
- the locking spring is formed as an elongate spring clip having two opposite end sides in a longitudinal direction of the spring clip and each having an opening through which the tensioning element is extendable.
- the tensioning member should be passed through both openings in the end sides of the spring clip and then be mounted on the clamping stirrup and the tensioning lever. This makes the mounting of the locking spring very easy and quick.
- the counter-locking means of the protective hood is formed as locking teeth which together form mounting means for mounting the protective hood on a housing flange.
- This design with several locking teeth makes a better clamping possible because the locking teeth are noticeably flexible and as a continuous rim with corresponding tolerances, can be better aligned.
- the counter-locking means has a plurality of counter-locking elements uniformly distributed on the protective hood. Therefore, the protective hood can be fixedly secured relative to the housing in a plurality of rotational position.
- FIG. 1 a side view of a hand-held power tool according to the present invention with a locking and holding device for the protective hood of the power tool in a release position;
- FIG. 2 a perspective view of the protective hood and a section of the housing of the power tool shown in FIG. 1 ;
- FIG. 3 a cross-sectional view of a detail of the power tool designated with a Roman numeral III in FIG. 1 ;
- FIG. 4 a partially cross-sectional side view of the power tool shown in FIG. 1 with the locking and holding device for the protective hood in the locking position;
- FIG. 5 a cross-sectional view of a detail of the power tool designated with a Roman numeral V in FIG. 4 ;
- FIG. 6 a partially cross-sectional side view of another embodiment of a hand-held power tool according to the present invention with the locking and holding device for the protective hood of the power tool in a release position;
- FIG. 7 a cross-sectional view of a detail of the power tool designated with a Roman numeral VII in FIG. 6 ;
- FIG. 8 a cross-sectional view of the detail VII, as shown in FIG. 7 , in a locking position of the locking and holding device.
- a hand-held power tool 10 is formed as an angle grinder.
- a disc-shaped cutting or grinding working tool 12 which is shown in FIGS. 1 and 4 only schematically, is mounted on the power tool 10 and is driven by a drive unit located in a power tool housing 11 .
- the cutting or grinding tool 12 is secured on a drive spindle 13 projecting from the housing 11 at a housing flange 16 .
- a protective hood 17 is arranged on the housing 11 .
- the protective hood 17 is mounted on the housing flange 16 with mounting means 18 (see, in particular FIG.
- a locking and holding device 20 fixedly connectable with the housing 11 by fastening element 30 in form of screws.
- the mounting means 18 is formed as an annular member having a plurality of counter-locking elements 19 in form of locking teeth.
- the locking and holding device 20 has a clamping stirrup 22 having a first end 27 , a second end 28 , and a tensioning lever-mechanism 21 located between the two ends 27 and 28 .
- the tensioning lever mechanism 28 includes a tensioning lever 23 pivotally supported by a first pivot support 31 at the stirrup first end 27 .
- a bar-shaped tensioning member 26 on which the tensioning lever 23 is pivotally supported, is itself pivotally supported by a second pivot support 32 and is pivotally secured, at its end remote from the tensioning lever 23 , to an abutment 33 at the second stirrup end 28 .
- a locking spring 24 which is formed as a spring clip, is arranged on the tensioning member 26 .
- the locking spring 24 is shaped as elongate rectangular member extending in the direction of a longitudinal extent of the tensioning member 26 and open at one of its longitudinal sides.
- the opposite end sides of the locking spring 24 in the longitudinal direction of the locking spring 24 , each has a through-opening 36 (see in particular FIG. 2 ) through which the bar-shaped tensioning member 26 extends to thereby retain the locking spring 34 on the tensioning member 26 .
- the tensioning lever 23 is shown in its first position, with its free end pivoted away from the clamping stirrup 22 , in which the clamping stirrup 22 has a first stirrup width (or first diameter) and is released.
- the clamping stirrup 22 has a first stirrup width (or first diameter) and is released.
- none of the locking noses 25 is located in a gap between the counter-locking elements 19 which are provided on the protective hood 17 .
- the protective hood 17 can be taken off of the housing flange 16 .
- the tensioning lever 23 is shown in its second position in which its free end engages the clamping stirrup 22 .
- the clamping stirrup 22 has a second stirrup width (or second diameter) that is smaller than the first stirrup width (diameter).
- the clamping stirrup 22 is tensioned.
- at least one of the locking noses 25 is located in the gap between the counter-locking elements 19 which are provided on the protective hood 17 .
- the protective hood 17 is secured by the clamping stirrup 22 , which is fixedly mounted on the housing 11 , on the housing flange 16 .
- the locking nose(s) 25 and the counter-locking elements 19 lock the protective hood 17 on the housing flange 16 , preventing rotation of the protective hood 17 relative to the housing 11 .
- FIGS. 6 through 8 show another embodiment of an inventive hand-held power tool 10 that distinguishes from that shown in FIGS. 1 through 5 by the design of the tensioning member 26 and the locking spring 24 . Therefore, for the complete description of elements not mentioned below and their functions, reference is made to the description of the embodiment shown in FIGS. 1 through 5 .
- the locking spring 24 is formed integrally with the tensioning member 26 .
- the tensioning member 26 forms two, extending parallel to each other arcuate arms that project from an end side 34 , and the leaf spring-shaped spring 24 that has one of its ends connected with the end side 34 .
- the locking nose 25 is provided on an arcuate end of the locking spring 34 .
- the tensioning member 26 is pivotally connected with the abutment 33 on the second stirrup end 28 by a connection element 37 that is formed as a screw, thereby being pivotally supported on the abutment 33 .
- the tensioning member 26 is further pivotally supported on the second pivot support 32 on the tensioning lever 23 with its end remote from the connection element 37 .
- the tensioning lever 23 is shown in its first position, with its free end being pivoted away from the clamping stirrup 22 , in which the clamping stirrup 22 has a first stirrup width (or a first diameter) and is released.
- the locking nose 25 is not located in the gap between the counter-locking elements 19 which are provided on the protective hood 17 .
- the locking nose 25 is displaced radially outwardly.
- the protective hood 17 can be taken off of the housing flange 16 .
- FIG. 8 shows the tensioning lever 23 in its second position in which the free end of the tensioning lever 23 engages the clamping stirrup 22 and in which, the clamping stirrup 22 has a second stirrup width (or diameter) that is smaller than the first stirrup width (diameter).
- the clamping stirrup 22 is tensioned.
- the locking nose 25 extends into the gap between the counter-locking elements 19 provided on the protective hood 17 .
- the protective hood 17 is secured by the clamping stirrup 22 , which is fixedly mounted on the housing 11 , on the housing flange 16 .
- the locking nose(s) 25 and the counter-locking elements 19 lock the protective hood 17 on the housing flange 16 , preventing rotation of the protective hood 17 relative to the housing 11 .
Abstract
A hand-held power tool for driving a grinding and cutting working tool (12) which is mounted on a drive spindle (13) projecting from the power tool housing (11), includes a locking and holding device (20) for releasably securing a protective hood (17), which at least partially covers the working tool (12) on the housing (11), with the holding device (20) having a clamping stirrup (22) for securing the protective hood (17), and a tensioning lever mechanism (21) with a tensioning lever (23) displaceable between a first position in which the clamping stirrup (22) is released and has a first stirrup width, and a second position in which the clamping stirrup is tensioned and has a second stirrup width smaller than the first stirrup width, and a locking spring (24) radially displaceable by the tensioning lever (23) and having at least one locking nose (25) for retaining the protective hood (17) on the housing (11) without a possibility of rotation relative thereto in the second position of the tensioning lever (23).
Description
- 1. Field of the Invention
- The present invention relates to a hand-held power tool for driving cutting or grinding working tools.
- 2. Description of the Prior Art
- Hand-held power tools of the type described above such as, e.g., angle grinder, have a circular disc-shaped cutting or grinding working tool rotatable during operation and used, e.g., for forming cuts in constructional components or for grinding surfaces of constructional components. The cutting or grinding working tool is covered circumferentially at least partially with a protective hood.
- German Publication DE 39 21 772 A1 discloses a hand-held power tool which is formed as an angle grinder and includes a protective hood releasably mounted on the power tool housing. To this end, the housing, in the region of the drive spindle exit, has a locking and holding device for securing the protective hood on the housing. An annular clamping stirrup of the locking and holding device and the diameter of which is adjusted by a tensioning lever, is fixedly secured on the housing. The clamping stirrup is arranged about the spindle and receives an annular flange of the protective hood which is forcelockingly and frictionally secured in the clamping stirrup. However, the protective hood is not formlockingly secured against rotation.
- German Publication DE 102 59 520 A1 discloses a hand-held power tool for a rotational disc-shaped working tool having a housing from which a drive spindle projects for mounting a working tool thereon and on which a hollow cylindrical locking neck, coaxial with the drive spindle, is formed. A protective hood for at least partially covering the working tool is releasably mounted on the housing. The protective hood is mounted on the locking neck and is secured thereon by a clamping stirrup provided with locking screws. For mounting the protective hood in a desired rotational position relative to the housing, without using any auxiliary tool and for securing the protective hood in that position, the clamping stirrup is pivotally mounted on the locking neck and is retained there with manually releasable locking means arranged between the locking neck and the clamping stirrup and independent of the locking screws. The drawback here consists in that several expensive operational steps are necessary for mounting the protective hood and fixedly securing it against rotation.
- An object of the present invention is to provide a hand-held power tool in which the drawbacks of known hand-held power tools are eliminated, and the protective hood is securable on the housing against rotation relative thereto in a constructively simple way.
- This and other objects of the present invention, which will become apparent hereinafter are achieved by providing a hand-held power tool for driving a cutting or grinding working tool and including a housing, a drive spindle extending from the housing for mounting the working tool thereon, a protective hood for at least partially covering the working tool and securable on the housing, and a locking and holding device for releasably securing the protective hood on the housing and having a clamping stirrup for securing the protective hood and having a variable stirrup width, and a tensioning lever mechanism having a tensioning lever for operating the clamping stirrup and displaceable between a first position in which the clamping stirrup is released and has a first stirrup width, and a second position in which the clamping stirrup is tensioned and has a second stirrup width smaller than the first stirrup width, and a locking spring radially displaceable by the tensioning lever and having at least one locking nose for retaining the protective hood on the housing without a possibility of rotation relative thereto in the second position of the tensioning lever.
- The present invention insures fixing of the protective hood on the housing and securing of the mounted protective hood against rotation relative to the housing without any auxiliary tool or tools in a single operational step, with the locking and holding device requiring only one additional component for forming the locking mechanism. Here, “against rotation,” means not only that no pivotal movement relative to the housing becomes possible but rather that any rotation relative to the housing (about the drive spindle axis) is prevented.
- Advantageously, the clamping stirrup and the tensioning lever mechanism are fixedly secured on the housing and the protective hood has counter-locking means engageable, in the second position of the tensioning lever, by the at least one nose of the locking spring for retaining the protective hood on the housing without a possibility of rotation relative thereto.
- As a result, there is no need to provide separate counter-locking means on the housing and, in particular on the housing flange of the hand-held power tool, which are expensive to produce and install. Besides, the working and protective region is not limited in any way as the protective hood is rotatable by 360°. Because the protective hood has no interfering operational handle, a further advantage consists in that in each position, a maximal cut depth is available.
- It is advantageous when the tensioning lever mechanism includes a tensioning member connectable with the locking spring (a toggle lever design), with the locking spring being arranged on the tensioning member. With such a design, the locking spring can be mounted on the tensioning member in a technically simple manner, by simply being pushed on the tensioning member. Because the tensioning member is displaced radially when the tensioning lever is displaced from its first position (release position of the clamping stirrup) to its second position (tensioning position of the clamping stirrup) and vice versa, the tensioning member is particular suitable as a carrier of the locking nose of the locking spring.
- It is also advantageous when the locking spring is formed as a leaf spring, so that the transition of the tensioning lever mechanism from a release position of the clamping stirrup into tensioning position of the clamping stirrup is also possible when the locking nose is not engageable with the counter-locking means of the protective hood. The engagement can be effected, e.g., later by rotating the protective hood relative to the housing, so that the locking nose automatically is displaced in its locking position by the biasing force of the leaf spring.
- Advantageously, the tensioning member is formed integrally with the leaf spring. Thereby, a particularly convenient manufacturing of the assembly becomes possible. Thus, the tensioning member can be, e.g., economically formed as a stamped and bent part.
- According to an alternative embodiment of the present invention, the locking spring is formed as an elongate spring clip having two opposite end sides in a longitudinal direction of the spring clip and each having an opening through which the tensioning element is extendable. Thus, during mounting of the locking and holding device, the tensioning member should be passed through both openings in the end sides of the spring clip and then be mounted on the clamping stirrup and the tensioning lever. This makes the mounting of the locking spring very easy and quick.
- Advantageously, the counter-locking means of the protective hood is formed as locking teeth which together form mounting means for mounting the protective hood on a housing flange. This design with several locking teeth makes a better clamping possible because the locking teeth are noticeably flexible and as a continuous rim with corresponding tolerances, can be better aligned.
- Advantageously, the counter-locking means has a plurality of counter-locking elements uniformly distributed on the protective hood. Therefore, the protective hood can be fixedly secured relative to the housing in a plurality of rotational position.
- The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
- The drawings show:
-
FIG. 1 a side view of a hand-held power tool according to the present invention with a locking and holding device for the protective hood of the power tool in a release position; -
FIG. 2 a perspective view of the protective hood and a section of the housing of the power tool shown inFIG. 1 ; -
FIG. 3 a cross-sectional view of a detail of the power tool designated with a Roman numeral III inFIG. 1 ; -
FIG. 4 a partially cross-sectional side view of the power tool shown inFIG. 1 with the locking and holding device for the protective hood in the locking position; -
FIG. 5 a cross-sectional view of a detail of the power tool designated with a Roman numeral V inFIG. 4 ; -
FIG. 6 a partially cross-sectional side view of another embodiment of a hand-held power tool according to the present invention with the locking and holding device for the protective hood of the power tool in a release position; -
FIG. 7 a cross-sectional view of a detail of the power tool designated with a Roman numeral VII inFIG. 6 ; and -
FIG. 8 a cross-sectional view of the detail VII, as shown inFIG. 7 , in a locking position of the locking and holding device. - In the drawings, the same parts are designated with the same reference numerals.
- A hand-held
power tool 10, a first embodiment of which is shown inFIGS. 1 through 5 , is formed as an angle grinder. As shown inFIGS. 1 and 4 , a disc-shaped cutting or grindingworking tool 12, which is shown inFIGS. 1 and 4 only schematically, is mounted on thepower tool 10 and is driven by a drive unit located in apower tool housing 11. The cutting orgrinding tool 12 is secured on adrive spindle 13 projecting from thehousing 11 at ahousing flange 16. For the cutting orgrinding tool 12, aprotective hood 17 is arranged on thehousing 11. Theprotective hood 17 is mounted on thehousing flange 16 with mounting means 18 (see, in particularFIG. 2 ) and cover at least partially the cutting orgrinding tool 12. For securing theprotective hood 17 on theflange 16, there is provided a locking and holdingdevice 20 fixedly connectable with thehousing 11 by fasteningelement 30 in form of screws. The mounting means 18 is formed as an annular member having a plurality ofcounter-locking elements 19 in form of locking teeth. The locking andholding device 20 has aclamping stirrup 22 having afirst end 27, asecond end 28, and a tensioning lever-mechanism 21 located between the twoends - The
tensioning lever mechanism 28 includes atensioning lever 23 pivotally supported by afirst pivot support 31 at the stirrupfirst end 27. A bar-shapedtensioning member 26, on which thetensioning lever 23 is pivotally supported, is itself pivotally supported by asecond pivot support 32 and is pivotally secured, at its end remote from the tensioninglever 23, to anabutment 33 at the secondstirrup end 28. - A locking
spring 24, which is formed as a spring clip, is arranged on the tensioningmember 26. The lockingspring 24 is shaped as elongate rectangular member extending in the direction of a longitudinal extent of the tensioningmember 26 and open at one of its longitudinal sides. On the open longitudinal side, which forms a leaf spring, there are provided, on the lockingspring 24, two lockingnoses 25 located adjacent to the housing flange 16 (see in particularFIGS. 3 and 4 ). The opposite end sides of the lockingspring 24, in the longitudinal direction of the lockingspring 24, each has a through-opening 36 (see in particularFIG. 2 ) through which the bar-shapedtensioning member 26 extends to thereby retain the lockingspring 34 on the tensioningmember 26. - In
FIGS. 1 and 3 , the tensioninglever 23 is shown in its first position, with its free end pivoted away from the clampingstirrup 22, in which the clampingstirrup 22 has a first stirrup width (or first diameter) and is released. As particularly shown inFIG. 3 , none of the lockingnoses 25 is located in a gap between thecounter-locking elements 19 which are provided on theprotective hood 17. In this position of thetensioning lever 23, theprotective hood 17 can be taken off of thehousing flange 16. - In
FIGS. 4 and 5 , the tensioninglever 23 is shown in its second position in which its free end engages the clampingstirrup 22. In this position of thetensioning lever 23, the clampingstirrup 22 has a second stirrup width (or second diameter) that is smaller than the first stirrup width (diameter). The clampingstirrup 22 is tensioned. As particularly shown inFIG. 5 , at least one of the lockingnoses 25 is located in the gap between thecounter-locking elements 19 which are provided on theprotective hood 17. In the second position of thetensioning lever 23, theprotective hood 17 is secured by the clampingstirrup 22, which is fixedly mounted on thehousing 11, on thehousing flange 16. Simultaneously, the locking nose(s) 25 and thecounter-locking elements 19 lock theprotective hood 17 on thehousing flange 16, preventing rotation of theprotective hood 17 relative to thehousing 11. -
FIGS. 6 through 8 show another embodiment of an inventive hand-heldpower tool 10 that distinguishes from that shown inFIGS. 1 through 5 by the design of the tensioningmember 26 and the lockingspring 24. Therefore, for the complete description of elements not mentioned below and their functions, reference is made to the description of the embodiment shown inFIGS. 1 through 5 . The lockingspring 24 is formed integrally with the tensioningmember 26. The tensioningmember 26 forms two, extending parallel to each other arcuate arms that project from anend side 34, and the leaf spring-shapedspring 24 that has one of its ends connected with theend side 34. The lockingnose 25 is provided on an arcuate end of the lockingspring 34. The tensioningmember 26 is pivotally connected with theabutment 33 on the secondstirrup end 28 by aconnection element 37 that is formed as a screw, thereby being pivotally supported on theabutment 33. The tensioningmember 26 is further pivotally supported on thesecond pivot support 32 on thetensioning lever 23 with its end remote from theconnection element 37. - In
FIGS. 6 and 7 , the tensioninglever 23 is shown in its first position, with its free end being pivoted away from the clampingstirrup 22, in which the clampingstirrup 22 has a first stirrup width (or a first diameter) and is released. As particularly shown inFIG. 7 , the lockingnose 25 is not located in the gap between thecounter-locking elements 19 which are provided on theprotective hood 17. The lockingnose 25 is displaced radially outwardly. In the first position, of thetensioning lever 24, theprotective hood 17 can be taken off of thehousing flange 16. -
FIG. 8 shows thetensioning lever 23 in its second position in which the free end of thetensioning lever 23 engages the clampingstirrup 22 and in which, the clampingstirrup 22 has a second stirrup width (or diameter) that is smaller than the first stirrup width (diameter). In the second position of thetensioning lever 23, the clampingstirrup 22 is tensioned. As further shown inFIG. 8 , the lockingnose 25 extends into the gap between thecounter-locking elements 19 provided on theprotective hood 17. In the second position of thetensioning lever 23, theprotective hood 17 is secured by the clampingstirrup 22, which is fixedly mounted on thehousing 11, on thehousing flange 16. Simultaneously, the locking nose(s) 25 and thecounter-locking elements 19 lock theprotective hood 17 on thehousing flange 16, preventing rotation of theprotective hood 17 relative to thehousing 11. - Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is, therefore, not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
Claims (8)
1. A hand-held power tool for driving a cutting or grinding working tool (12), comprising a housing (11); a drive spindle (13) extending from the housing (11) for mounting the working tool (12) thereon; a protective hood (17) for at least partially covering the working tool (12) and securable on the housing (11); and a locking and holding device (20) for releasably securing the protective hood (17) on the housing and including a clamping stirrup (22) for securing the protective hood (17) and having a variable stirrup width, and a tensioning lever mechanism (21) having a tensioning lever (23) for operating the clamping stirrup (22) and displaceable between a first position in which the clamping stirrup (22) is released and has a first stirrup width, and a second position in which the clamping stirrup is tensioned and has a second stirrup width smaller than the first stirrup width, and a locking spring (24) radially displaceable by the tensioning lever (23) and having at least one locking hose (25) for retaining the protective hood (17) on the housing (11) without a possibility of rotation relative thereto in the second position of the tensioning lever (23).
2. A hand-held power tool according to claim 1 , wherein the clamping stirrup (22) and the tensioning lever mechanism (21) are fixedly secured on the housing (11), and wherein the protective hood (17) has counter-locking means (19) engageable, in the second position of the tensioning lever (23), by the at least one nose (25) of the locking spring (24) for retaining the protective hood (17) on the housing (11) without a possibility of rotation relative thereto.
3. A hand-held power tool according to claim 1 , wherein the tensioning lever mechanism (21) comprises a tensioning member (26) on which the locking lever (23) is arranged.
4. A hand-held power tool according to claim 1 , wherein the locking spring (23) is formed as a leaf spring.
5. A hand-held power tool according to claim 3 , wherein the locking spring (23) is formed integrally with the tensioning member (26).
6. A hand-held power tool according to claim 3 , wherein the locking spring (23) is formed as an elongate spring clip having two opposite end sides in a longitudinal direction of the spring clip and each having an opening (36) through which the tensioning element (26) is extendable.
7. A hand-held power tool according to claim 2 , wherein the counter-locking means (19) of the protective hood (17) is formed as locking teeth which together form mounting means (18) for mounting the protective hood (17) on a housing flange (16).
8. A hand-held power tool according to claim 2 , wherein the counter-locking means (19) comprises a plurality of counter-locking elements uniformly distributed on the protective hood (17).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007000845A DE102007000845A1 (en) | 2007-10-11 | 2007-10-11 | Manually operated machine for operating separating or grinding tool, has housing, drive screw for separating or grinding tool, and clamping lever mechanism that is provided with retaining spring element |
DE102007000845.9 | 2007-10-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090156105A1 true US20090156105A1 (en) | 2009-06-18 |
Family
ID=40435147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/287,639 Abandoned US20090156105A1 (en) | 2007-10-11 | 2008-10-10 | Hand-held power tool |
Country Status (5)
Country | Link |
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US (1) | US20090156105A1 (en) |
CN (1) | CN101407038A (en) |
CH (1) | CH697956B1 (en) |
DE (1) | DE102007000845A1 (en) |
FR (1) | FR2922132A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2460944A (en) * | 2008-06-17 | 2009-12-23 | Bosch Gmbh Robert | Protective hood for a power tool |
US10201889B2 (en) | 2014-08-06 | 2019-02-12 | Sparky Guard, LLC | Fully rotatable grinder guard assembly and method for making same |
US10800003B2 (en) * | 2017-05-09 | 2020-10-13 | Dust Away LLC | Dust shroud |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012240127A (en) * | 2011-05-16 | 2012-12-10 | Makita Corp | Grinder |
DE102011089758A1 (en) * | 2011-12-23 | 2013-06-27 | Robert Bosch Gmbh | Guard anti |
DE102012210759A1 (en) * | 2012-06-25 | 2014-01-02 | Robert Bosch Gmbh | Guard device |
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US6893334B1 (en) * | 2002-01-24 | 2005-05-17 | J. David Stivers | Rotating guard for angle grinder |
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DE3921777C2 (en) | 1989-03-16 | 2002-08-29 | Irbit Res & Consulting Ag Frei | sealing element |
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2007
- 2007-10-11 DE DE102007000845A patent/DE102007000845A1/en not_active Withdrawn
-
2008
- 2008-07-08 CH CH01062/08A patent/CH697956B1/en not_active IP Right Cessation
- 2008-10-08 CN CNA2008101661646A patent/CN101407038A/en active Pending
- 2008-10-10 US US12/287,639 patent/US20090156105A1/en not_active Abandoned
- 2008-10-10 FR FR0856856A patent/FR2922132A1/en not_active Withdrawn
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US4060940A (en) * | 1976-01-13 | 1977-12-06 | The Black And Decker Manufacturing Company | Adjustable guard construction for cut-off machine |
US4574532A (en) * | 1983-10-27 | 1986-03-11 | C. & E. Fein Gmbh & Co. | Protective-hood fastening for portable angled grinders |
US5005321A (en) * | 1986-10-28 | 1991-04-09 | Robert Bosch Gmbh | Protective hood for grinding machines, particularly angle grinders, and suitable fastening receptacle for the latter |
US4791541A (en) * | 1987-08-28 | 1988-12-13 | Mc Gill Manufacturing Company, Inc. | Protective cage for a lamp |
US4924635A (en) * | 1987-12-24 | 1990-05-15 | C. & E. Feini GmbH & Co. | Portable grinder with adjustable protective hood |
US5031325A (en) * | 1989-07-01 | 1991-07-16 | Hilti Aktiengesellschaft | Hand-held tool with a cutting or grinding disk |
US5440815A (en) * | 1992-04-13 | 1995-08-15 | Inkster; Kevin R. | Guide for rotary cutter tools |
US5384985A (en) * | 1992-06-29 | 1995-01-31 | Atlas Copco Tools Ab | Pneumatic rotation grinder |
US5766062A (en) * | 1996-06-13 | 1998-06-16 | Atlas Copco Tools Ab | Portable power tool |
US6669544B1 (en) * | 2000-01-10 | 2003-12-30 | Robert Bosch Gmbh | Protective hood for a right angle grinder |
US6464573B1 (en) * | 2000-06-30 | 2002-10-15 | Porter-Cable Corporation | Guard attachment system with knurled clamp ring |
US20040014412A1 (en) * | 2001-05-18 | 2004-01-22 | Albrecht Hofmann | Hand-guided electric tool comprising a guard |
US6988939B2 (en) * | 2001-05-18 | 2006-01-24 | Robert Bosch Gmbh | Hand-guided electric tool comprising a guard |
US6893334B1 (en) * | 2002-01-24 | 2005-05-17 | J. David Stivers | Rotating guard for angle grinder |
US6699114B1 (en) * | 2002-04-26 | 2004-03-02 | Benedict Engineering Company, Inc. | Pivotal guards for power hand tools with rotating discs |
US20060052041A1 (en) * | 2002-12-19 | 2006-03-09 | Robert Bosch Gmbh | Electri portable power tool |
US7311589B2 (en) * | 2002-12-19 | 2007-12-25 | Robert Bosch Gmbh | Electric portable power tool with rotatable guard |
US6949017B2 (en) * | 2003-08-11 | 2005-09-27 | Hilti Aktiengesellschaft | Hood mounting |
US7063606B2 (en) * | 2003-09-16 | 2006-06-20 | Robert Bosch Gmbh | Portable power tool with protective cover |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2460944A (en) * | 2008-06-17 | 2009-12-23 | Bosch Gmbh Robert | Protective hood for a power tool |
GB2460944B (en) * | 2008-06-17 | 2012-09-05 | Bosch Gmbh Robert | Power tool,in particular hand-held power tool |
US10201889B2 (en) | 2014-08-06 | 2019-02-12 | Sparky Guard, LLC | Fully rotatable grinder guard assembly and method for making same |
US10800003B2 (en) * | 2017-05-09 | 2020-10-13 | Dust Away LLC | Dust shroud |
Also Published As
Publication number | Publication date |
---|---|
DE102007000845A1 (en) | 2009-04-16 |
FR2922132A1 (en) | 2009-04-17 |
CH697956A2 (en) | 2009-04-15 |
CN101407038A (en) | 2009-04-15 |
CH697956B1 (en) | 2011-08-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HILTI AKTIENGESELLSCHAFT, LIECHTENSTEIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WIDMER, LOUIS;OSTERMEIER, PETER;KOSCHEL, CHRISTIAN;REEL/FRAME:022093/0350;SIGNING DATES FROM 20080730 TO 20081016 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |