Hand-Held Power Tool

Abstract

A hand-held power tool includes a handle which is grippable by a user, a tool body, a pivot pin, where the handle is pivotably mounted on the tool body by the pivot pin, and a tension spring, where the handle is hooked on the tool body by the tension spring and the handle is decoupled from vibrations acting on the tool body by the tension spring.

Claims

1.-10. (canceled)

11. A hand-held power tool, comprising: a first handle which is grippable by a user; a tool body; a first pivot pin, wherein the first handle is pivotably mounted on the tool body by the first pivot pin; and a first tension spring, wherein the first handle is hooked on the tool body by the first tension spring and wherein the first handle is decoupled from vibrations acting on the tool body by the first tension spring.

12. The hand-held power tool as claimed in claim 11, wherein the hand-held power tool is a demolition hammer or a chisel hammer.

13. The hand-held power tool as claimed in claim 11, further comprising a second handle to which a second pivot pin and a second tension spring are assigned.

14. The hand-held power tool as claimed in claim 13, wherein the first handle has a first gripping element which is grippable by the user, wherein the second handle has a second gripping element which is grippable by the user, wherein the second pivot pin is disposed between the first pivot pin and the first gripping element, and wherein the first pivot pin is disposed between the second pivot pin and the second gripping element.

15. The hand-held power tool as claimed in claim 14, wherein the first handle has a first base element which is pivotably mounted on the tool body by the first pivot pin, wherein the second handle has a second base element which is pivotably mounted on the tool body by the second pivot pin, wherein the first base element is led around the second pivot pin, and wherein the second base element is led around the first pivot pin.

16. The hand-held power tool as claimed in claim 15, wherein the first base element has a first fastening point at which the first tension spring is fastened, wherein the second base element has a second fastening point at which the second tension spring is fastened, wherein the first fastening point is disposed between the first gripping element and the first pivot pin, and wherein the second fastening point is disposed between the second gripping element and the second pivot pin.

17. The hand-held power tool as claimed in claim 16, wherein the first fastening point is disposed closer to the second pivot pin than to the first pivot pin and wherein the second fastening point is disposed closer to the first pivot pin than to the second pivot pin.

18. The hand-held power tool as claimed in claim 16, wherein the first fastening point is formed as a first hook into which the first tension spring is hooked and wherein the second fastening point is formed as a second hook into which the second tension spring is hooked.

19. The hand-held power tool as claimed in claim 11, wherein the first tension spring is hooked into the tool body.

20. The hand-held power tool as claimed in claim 19, further comprising a hooking element which is connected to the tool body and into which the first tension spring is hooked.

21. The hand-held power tool as claimed in claim 13, wherein the first handle and the second handle are disposed on respective sides of the tool body which lie opposite one another.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0026] The single FIGURE shows a schematic view of an embodiment of a hand-held power tool.

DETAILED DESCRIPTION OF THE DRAWING

[0027] Unless otherwise stated, elements that are the same or functionally the same are indicated in the FIGURE by the same reference signs.

[0028] The FIGURE shows a schematic view of an embodiment of a hand-held power tool 1. The hand-held power tool 1 is in particular a demolition hammer or a chisel hammer. The hand-held power tool 1 comprises a tool body 2. The tool body 2 may comprise a housing, in which a drive system of the hand-held power tool 1 is fitted. The drive system may for example comprise an electric motor.

[0029] In the orientation of the FIGURE, a striking mechanism 3 is provided on the underside of the tool body 2. A tool fitting 4 is provided on the front side of the striking mechanism 3. The tool fitting 4 is suitable for fitting a tool, such as for example a chisel. The tool fitting 4 may be a chuck. During the operation of the hand-held power tool 1, the tool fitting 4 is driven by the striking mechanism 3, so that the tool moves up and down along a vertical direction V. The hand-held power tool 1 is also assigned a horizontal direction H. The horizontal direction H is oriented perpendicularly to the vertical direction V. The vertical direction V may coincide with the direction of gravitational force.

[0030] The hand-held power tool 1 comprises a first handle 5 and also a second handle 6. The handles 5, 6 can each be gripped by the hand of a user. The handles 5, 6 are decoupled from the tool body 2. That is to say that vibrations or oscillations acting on the tool body 2 during the operation of the hand-held power tool 1 are not transmitted to the handles 5, 6, or are only transmitted to a restricted extent. The handles 5, 6 are arranged on sides of the tool body 2 lying opposite one another.

[0031] The first handle 5 comprises a first gripping element 7, which can be gripped by the user. The first gripping element 7 is arranged completely outside the tool body 2. The first gripping element 7 may be produced at least in certain portions from an elastically deformable material, such as for example a thermoplastic elastomer, rubber, cork or the like. The first handle 5 is also assigned a first base element 8. The first gripping element 7 is fixedly connected to the first base element 8.

[0032] The first base element 8 is pivotably mounted on the tool body 2 by means of a first pivot pin 9. The first pivot pin 9 may be for example a bolt which is fixed in relation to the tool body 2 and on which the first base element 8 is pivotably mounted. Alternatively, the first pivot pin 9 may also be a bolt which is fixedly connected to the first base element 8 and is pivotably mounted on the tool body 2.

[0033] The first base element 8 comprises a fastening point 10, which may be formed as a hook. Furthermore, the first base element 8 comprises an arcuately curved arc portion 11 and also a bearing portion 12, which is provided at the end of the arc portion 11. The first pivot pin 9 is fitted in the bearing portion 12.

[0034] The first handle 5 is also assigned a first tension spring 13. By means of the first tension spring 13, the first handle 5 is hooked on the tool body 2 in such a way that the first handle 5 is decoupled from vibrations acting on the tool body 2. In this case, the first tension spring 13 is always under tensile stress. The mobility of the first handle 5 is indicated by means of a double-headed arrow 14. The first tension spring 13 is preferably a cylindrical spring or a helical tension spring. The first tension spring 13 may however also be an elastomer body, for example an elastomer strap.

[0035] The first tension spring 13 is assigned a first hooking element 15 in the form of a plate, which in turn is fixedly connected to the tool body 2. The first hooking element 15 is optional. That is to say that the first tension spring 13 may also be hooked directly into the tool body 2.

[0036] The second handle 6 is constructed in a way analogous to the first handle 5 and comprises a second gripping element 16, which is fastened to a second base element 17. The second base element 17, like the first base element 8, is pivotably mounted on the tool body 2 by means of a second pivot pin 18. The second base element 17 comprises a fastening point 19, which is formed as a hook, an arcuately curved arc portion 20, which is led around the first pivot pin 9, and also a fastening portion 21, in which the second pivot pin 18 is fitted. Furthermore, the second handle 6 is assigned a second tension spring 22, which is hooked into the second base element 17 at the fastening point 19. The second tension spring 22 is preferably a cylindrical spring or a helical tension spring. The second tension spring 22 may however also be an elastomer body, for example an elastomer strap. The second tension spring 22 is in turn connected to the base body 2 by means of an optional second hooking element 23. The mobility of the second handle 6 is indicated by means of a double-headed arrow 24.

[0037] As the FIGURE also shows, the arc portion 20 of the second base element 17 is led around the first pivot pin 9, and the arc portion 11 of the first base element 8 is led around the second pivot pin 18. The pivot pins 9, 18 are in this case positioned at the same height with respect to the vertical direction V and are spaced apart from one another and next to one another with respect to the horizontal direction H. The fastening point 10 is in this case positioned closer to the second pivot pin 18 than to the first pivot pin 9. Accordingly, the fastening point 19 is also positioned closer to the first pivot pin 9 than to the second pivot pin 18. Furthermore, the fastening point 10 is positioned between the first gripping element 7 and the first pivot pin 9, and the fastening point 19 is positioned between the second gripping element 16 and the second pivot pin 18.

[0038] The functionality of the hand-held power tool 1 is explained below. During the operation of the hand-held power tool 1, vibrations are transmitted to the tool body 2 from the tool clamped in the tool fitting 4. The handles 5, 6 are decoupled from the tool body 2 by means of the tension springs 13, 22 in such a way that the vibrations transmitted to the tool body 2 are not transmitted to the handles 5, 6, or are at least transmitted to a reduced extent. The handles 5, 6 can in this case be swiveled clockwise and counterclockwise about the pivot pins 9, 18, as indicated by means of the double-headed arrows 14, 24.

[0039] In this case, however, the tension springs 13, 22 always remain under tensile stress. As a result, it is reliably prevented that the tension springs 13, 22 can buckle under loading, in comparison with a hand-held power tool with compression springs for vibration damping. When such compression springs buckle, they may come into frictional contact with a spring guide. This is reliably prevented by the use of the tension springs 13, 22. As a result, a friction-induced impairment of the vibration decoupling of the handles 5, 6 is reliably prevented.

LIST OF REFERENCE CHARACTERS

[0040] 1 Hand-held power tool [0041] 2 Tool body [0042] 3 Striking mechanism [0043] 4 Tool fitting [0044] 5 Handle [0045] 6 Handle [0046] 7 Gripping element [0047] 8 Base element [0048] 9 Pivot pin [0049] 10 Fastening point [0050] 11 Arc portion [0051] 12 Bearing portion [0052] 13 Tension spring [0053] 14 Double-headed arrow [0054] 15 Hooking element [0055] 16 Gripping element [0056] 17 Base element [0057] 18 Pivot pin [0058] 19 Fastening point [0059] 20 Arc portion [0060] 21 Fastening portion [0061] 22 Tension spring [0062] 23 Hooking element [0063] 24 Double-headed arrow [0064] H Horizontal direction [0065] V Vertical direction