Impact mechanism arrangement

Abstract

Hammer drill and/or chipping hammer (100) having a drive motor (70), an impact mechanism (10) and a tool fitting (50) for fitting a tool (110), wherein the impact mechanism (10) has an anvil (30) that is axially displaceable in an anvil guide (20) and acts on the tool (110), wherein the impact mechanism (10) is equipped with an idle-strike damper element (11) and a rebound-strike damper element (13), wherein the idle-strike damper element (11) and/or the rebound-strike damper element (13) is/are integrated on the anvil (30).

Claims

1-10. (canceled)

11. A hammer drill or chipping hammer comprising: a drive motor; an impact mechanism; and a tool fitting for fitting a tool, wherein the impact mechanism has an anvil axially displaceable in an anvil guide and acting on the tool, wherein the impact mechanism is equipped with an idle-strike damper element and a rebound-strike damper element, the idle-strike damper element or the rebound-strike damper element being integrated on the anvil.

12. The hammer drill or chipping hammer as recited in claim 11 wherein the idle-strike damper element and the rebound-strike damper element are formed in one piece with one another to define a combined damper element.

13. The hammer drill or chipping hammer as recited in claim 12 wherein the combined damper element is in the form of an elastomer.

14. The hammer drill or chipping hammer as recited in claim 13 wherein combined damper is vulcanized on the anvil.

15. The hammer drill or chipping hammer as recited in claim 12 wherein the the combined damper element is surrounded by a stop sleeve arranged so as to strike an idle-strike stop surface on one side and to strike a rebound-strike stop surface on the other side.

16. The hammer drill or chipping hammer as recited in claim 15 wherein the idle-strike stop surface is formed on the tool fitting itself.

17. The hammer drill or chipping hammer as recited in claim 16 wherein the rebound-strike stop surface is formed on a stop ring comprised by the tool fitting.

18. The hammer drill or chipping hammer as recited in claim 15 wherein the rebound-strike stop surface is formed on a stop ring comprised by the tool fitting.

19. The hammer drill or chipping hammer as recited in claim 18 wherein the stop ring is supported by an auxiliary rebound-strike damper element with respect to the tool fitting.

20. The hammer drill or chipping hammer as recited in claim 11 wherein the impact mechanism has a guide housing engaging at least partially around the anvil or the tool fitting.

21. The hammer drill or chipping hammer as recited in claim 20 wherein the tool fitting is movable in the axial direction relative to the guide housing.

22. The hammer drill or chipping hammer as recited in claim 20 wherein the tool fitting is arranged at least partially within the guide housing.

23. The hammer drill or chipping hammer as recited in claim 20 wherein the impact mechanism has an additional idle-strike damper element acting between the tool fitting and the guide housing.

24. The hammer drill or chipping hammer as recited in claim 23 wherein the impact mechanism has an additional rebound-strike damper element acting between the tool fitting and the guide housing.

25. The hammer drill or chipping hammer as recited in claim 20 wherein the impact mechanism has an additional rebound-strike damper element acting between the tool fitting and the guide housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In the figures, identical and similar components are denoted by the same reference signs. In the figures:

[0015] FIG. 1 shows a preferred exemplary embodiment of a hammer drill and/or chipping hammer according to the invention; and

[0016] FIGS. 2A and 2B show a preferred exemplary embodiment of an impact mechanism in two states.

DETAILED DESCRIPTION

[0017] A preferred exemplary embodiment of a hammer drill and/or chipping hammer 100 according to the invention is illustrated in FIG. 1. The hammer drill and/or chipping hammer 100 is equipped with a drive motor 70, an impact mechanism 10 and a tool fitting 50 for fitting a tool 110. The impact mechanism 10 and the drive motor 70 are arranged within a housing 90 of the hammer drill and/or chipping hammer 100.

[0018] The impact mechanism 10 has an anvil 30 that is displaceable in the axial direction AR in an anvil guide 20 and acts on the tool 110. The anvil guide 20 is realized for example by two rolling bearings 21, 23, which are respectively supported both in a radial direction RR and in the axial direction AR against the tool fitting 50.

[0019] The impact mechanism 10 is equipped with an idle-strike damper element 11 and a rebound-strike damper element 13, which are integrated according to the invention on the anvil 30. As is apparent from FIG. 1, the idle-strike damper element 11 and the rebound-strike damper element 13 are formed in one piece with one another and as such form a combined damper element 15. The combined damper element 15 is in the form of an elastomer and has in this case for example been vulcanized on the anvil 30. The combined damper element 15 is surrounded by a stop sleeve 17, which is configured arranged so as to strike an idle-strike stop surface 12 on one side (cf. FIG. 2A) and to strike a rebound-strike stop surface 14 on the other side (cf. FIG. 2B). In this case, the idle-strike stop surface 12 is formed on the tool fitting 50 itself. The rebound-strike stop surface 14 is formed on a stop ring 55 comprised by the tool fitting 50.

[0020] As is likewise apparent from FIG. 1, the impact mechanism 10 has a guide housing 80, which engages at least partially around both the anvil 30 and the tool fitting 50. In this case, the tool fitting 50 is movable in the axial direction AR relative to the guide housing 80 and is arranged at least partially within the guide housing 80. The impact mechanism 10 has an additional idle-strike damper element 31, which acts between the tool fitting 50 and the guide housing 80. The impact mechanism is likewise equipped with an additional rebound-strike damper element 33, which acts between the tool fitting 50 and the guide housing 80. As a result of cooperation of the additional idle-strike damper element 31 and additional rebound-strike damper element 33, the tool fitting 50 is mounted in a floating manner with respect to the guide housing 80, with the result that a not inconsiderable part of the impact energy of the anvil can be attenuated. As is apparent from FIG. 1, force introduction from the tool fitting 50 into the unit made up of the additional idle-strike damper element 31 and additional rebound-strike damper element 33 takes place by way of a peg 55 protruding in a radial direction RR from the tool fitting, said peg 55 engaging—with respect to the axial direction—between the additional idle-strike damper element 31 and additional rebound-strike damper element 33.

[0021] A preferred exemplary embodiment of an impact mechanism 10 is illustrated in FIGS. 2A and 2B. In this case, FIG. 2A shows the moment of an idle strike, i.e. the anvil shown in FIG. 2A is moving toward the left and the stop sleeve 17 surrounding the combined damper element 15 is already in contact with the idle-strike stop surface 12. The idle-strike stop surface 12 is formed on the tool fitting 50 and is located on the side of the stop sleeve that faces the tool 110 (cf. FIG. 1).

[0022] FIG. 2B in turn shows the moment of a rebound strike, i.e. the anvil shown in FIG. 2B is moving toward the right and the stop sleeve 17 surrounding the combined damper element 15 is already in contact with the rebound-strike stop surface 14. The rebound-strike stop surface 14 is formed on a stop ring 55 comprised by the tool fitting 50. In this case, the rebound-strike stop surface 14 is located on the side of the stop sleeve 17 that faces away from the tool 110 (cf. FIG. 1).

[0023] In contrast to the exemplary embodiment shown in FIG. 1, in the exemplary embodiment in FIGS. 2A and 2B, the stop ring 55 is supported by an auxiliary rebound-strike damper element 57 with respect to the tool fitting 50. By way of the auxiliary rebound-strike damper element 57, a rebound strike (the anvil in FIG. 2B is moving toward the right) can be additionally damped. As is apparent from FIGS. 2A and 2B, the auxiliary rebound-strike damper element 57 is, with respect to the axial direction AR, between the stop ring 55 and that rolling bearing 23 that is located on the side of the stop sleeve 17 that faces away from the tool 110 (cf. FIG. 1).

LIST OF REFERENCE SIGNS

[0024] 10 Impact mechanism [0025] 11 Idle-strike damper element [0026] 12 Idle-strike stop surface [0027] 13 Rebound-strike damper element [0028] 14 Rebound-strike stop surface [0029] 15 Combined damper element [0030] 17 Stop sleeve [0031] 20 Anvil guide [0032] 21, 23 Rolling bearing [0033] 30 Anvil [0034] 31 Additional idle-strike damper element [0035] 33 Additional rebound-strike damper element [0036] 50 Tool fitting [0037] 51 Peg [0038] 55 Stop ring [0039] 57 Auxiliary rebound-strike damper element [0040] 70 Drive motor [0041] 80 Guide housing [0042] 90 Housing [0043] 100 Hammer drill and/or chipping hammer [0044] 110 Tool [0045] AR Axial direction [0046] RR Radial direction