Suction-extraction device for a demolition hammer

Abstract

Suction-extraction device for a demolition hammer, wherein the demolition hammer has a housing and a tool fitting for receiving a demolition chisel, wherein the suction-extraction device has a flexible suction hose on whose free end there is connected a suction body via which dust is to be sucked up from a working region of the demolition chisel, wherein the suction-extraction device has a fastening element by which the suction hose can be mounted on the housing of the demolition hammer at a fastening point of the suction hose that is spaced apart from the free end, with the result that, during suction operation, the suction body can be freely pivoted with respect to the demolition chisel, at least in the radial direction.

Claims

1-12. (canceled)

13. A suction-extraction device for a demolition hammer having a housing and a tool fitting for receiving a demolition chisel, the suction-extraction device comprising: a flexible suction hose; a suction body connected to a free end of the suction hose and for sucking up dust from a working region of the demolition chisel; and a fastener, the suction hose mountable on the housing of the demolition hammer at a fastening point of the suction hose via the fastener, the fastening point of the suction hose being spaced apart from the free end so that, during suction operation, the suction body is pivotable with respect to the demolition chisel.

14. The suction-extraction device as recited in claim 13 wherein the suction body is pivotable in a radial direction.

15. The suction-extraction device as recited in claim 13 wherein the fastening element is in the form of a retaining clip.

16. The suction-extraction device as recited in claim 15 wherein the retaining clip has an eye designed to clamp around the suction hose

17. The suction-extraction device as recited in claim 16 wherein the eye clamps around the suction hose completely.

18. The suction-extraction device as recited in claim 16 wherein a diameter of the eye is widenable by a manual actuation so that the eye is displaceable along a length of the suction hose.

19. The suction-extraction device as recited in claim 15 wherein the retaining clip has two holding arms designed to engage in two mounting openings in the housing of the demolition hammer.

20. The suction-extraction device as recited in claim 13 wherein the suction body has a suction dome.

21. The suction-extraction device as recited in claim 20 wherein the suction dome has a suction slot extending in an axial direction along the suction dome.

22. The suction-extraction device as recited in claim 21 wherein the suction slot opens into a suction channel situated in an interior of the suction dome.

23. The suction-extraction device as recited in claim 20 wherein the suction dome has a plurality of suction slots arranged uniformly spaced apart from one another along a circumferential direction of the suction dome, wherein each of the suction slots opens into a respective suction channel.

24. The suction-extraction device as recited in claim 20 wherein the suction body has a carrier piece, the suction hose fastenable on one side to the carrier piece and to the suction dome on the other side.

25. The suction-extraction device as recited in claim 13 wherein, during the intended suction operation, the suction body does not enclose the demolition chisel.

26. A method for operating the suction-extraction device as recited in claim 13 comprising using the suction-extraction device to suck up dust from the working region of the demolition chisel received in the tool fitting of the demolition hammer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Identical and similar components are denoted by the same reference signs in the figures, in which:

[0016] FIG. 1 shows a first preferred exemplary embodiment of a suction-extraction device;

[0017] FIG. 2 shows a fastening element of the suction-extraction device of FIG. 1;

[0018] FIG. 3 shows the suction-extraction device of FIG. 1 with two fastening elements;

[0019] FIG. 4 shows a suction body of the suction-extraction device of FIG. 1; and

[0020] FIGS. 5A and 5B show an exploded illustration of the suction body of FIG. 4.

DETAILED DESCRIPTION

[0021] A first preferred exemplary embodiment of a suction-extraction device 100 according to the invention is illustrated in FIG. 1. The suction-extraction device 100 is arranged on a heavy demolition hammer 200. The demolition hammer 200 can also be referred to as a chisel hammer or floorbreaker. The demolition hammer 200 has a housing 210 and a tool fitting 220. In the tool fitting 220 there is situated a demolition chisel 250 for chiseling work along the axial direction AR. The suction-extraction device 100 has a flexible suction hose 10 with a diameter of approximately 35 mm. A suction body 20 is connected to a free end 11 of the suction hose 10. Dust can be sucked up from a working region AB of the demolition chisel 250 via the suction body 20 and the suction hose 10. This is achieved, for example, by means of a construction site vacuum cleaner.

[0022] The suction-extraction device 100 has a fastening element 30 by means of which the suction hose 10 is mounted on the housing 210 of the demolition hammer 200. Here, the fastening element 30 is mounted at a fastening point 13 of the suction hose 10 that is spaced apart from the end 11 of the suction hose 10. Consequently, during suction operation, the suction body 20 can be freely pivoted with respect to the demolition chisel 250, at least in the radial direction RR. This has the crucial advantage of at all times making it possible to have a free view of the demolition chisel 250, which is important in particular in the case of the heavy demolition hammer 200 of FIG. 1. The fastening point 13 defines a pivot point SP around which the suction hose 10 together with suction body can be pivoted.

[0023] As can be gathered from FIG. 1, the fastening element 30 takes the form of a retaining clip 31 (cf. FIG. 2). The retaining clip 31 has an eye 33 which is designed to completely clamp around the suction hose 10. A diameter DM of the eye 33 (cf. FIG. 2) can be widened by a manual actuation such that the eye 33 can be displaced along a length LS of the suction hose 10. The position of the suction body 20 in the axial direction AR relative to the demolition chisel 250 can thus be changed. The retaining clip 31 has two holding arms 35 which are designed to engage in two mounting openings 211 (only one of these can be seen in FIG. 1) in the housing 210 of the demolition hammer 200. In the presently illustrated exemplary embodiment, the mounting openings 211 are a cutout in the housing 210 in which a housing screw is sunk. It can clearly be seen in FIG. 1 that the suction body 20 has a suction dome 21 which has at least one suction slot 23 which extends in the axial direction AR along the suction dome 21.

[0024] With reference to FIG. 2, the fastening element 30 of the suction-extraction device 100 of FIG. 1 will now be more precisely explained. The fastening element 30 takes the form of a retaining clip 31. FIG. 2A shows a plan view of the retaining clip 31 (view from above in the axial direction AR in FIG. 1). FIG. 2B shows a side view of the retaining clip 31, and FIG. 2C shows a perspective view. The circular eye 33 of the retaining clip 31 is designed to completely clamp around the suction hose 10 (cf. FIG. 1). The diameter DM of the eye 33 is, by way of example, 35 mm and is tailored to a diameter of the suction hose 10.

[0025] The eye 33 of the retaining clip 31 extends on both sides into a respective holding arm 35. The holding arms are provided to engage in two mounting openings 211 in the housing 210 of the demolition hammer 200 (cf. FIG. 1). The eye 33 can be widened by a manual actuation force HF (thick solid arrows in FIG. 2A). The forced-open eye 33 thus widened for example to a diameter DM of 45 mm can be displaced as desired along the suction hose. Here, the manual actuation force HF is applied counter to a preloading force VF (thick dashed arrows in FIG. 2A). The retaining clip 31, which can, for example, be bent in one piece from a spring steel, can be produced in a technically ingeniously simple and comparatively cost-effective manner.

[0026] FIG. 3 illustrates the suction-extraction device 100 of FIG. 1 proportionately, wherein the suction hose 10 is held with an additional fastening element 30 which engages in a further mounting opening 211 on the housing 210. The additional fastening element 30 is structurally identical to the fastening element 30 and also is in the form of a retaining clip 31. However, the additional fastening element 30 does not define an additional pivot point for the suction hose 10, but serves only for the (additional) securement of the suction hose 10 on the housing 210 at a second fastening point 13.

[0027] FIGS. 4 and 5A and 5B show the suction body 20 in detail. In the present case, the suction body 20 is, by way of example, constructed in two parts and has a suction dome 21 and a carrier piece 27. As can be gathered from FIG. 4, the suction dome 21 has a plurality of suction slots 23 which are arranged uniformly spaced apart from one another along a circumferential direction UR of the suction dome 21. Dust can be sucked up via these suction slots 23. Comparatively large fragments cannot pass through these suction slots 23. At its end side, the suction dome 21 has a plurality of suction apertures 24 which for their part are arranged uniformly spaced apart from one another along the circumferential direction UR of the suction dome 21.

[0028] It can clearly be seen in FIG. 5B that each of the suction slots 23 opens into a respective suction channel 25 formed in the interior of the suction dome 21. In the center of the suction dome 21 there is arranged a central connection region 28 into which all of the suction channels 25 open. Centrally in the carrier piece 27 there is formed a corresponding connection region 28 in which, during suction operation, dust is conducted to the suction hose (not shown). The suction hose itself is screwed into an internal thread 29 of the carrier piece 27. As can also be gathered from FIG. 5, the carrier piece 27 has a plurality of latching lugs 26 which are arranged uniformly spaced apart from one another along the circumferential direction UR. The carrier piece 27 can be re-releasably connected to the suction dome 21 by means of the latching lugs 26. The suction body 20 formed by the suction dome 21 and the carrier piece 27 does not enclose the demolition chisel 250 during the intended suction operation.

LIST OF REFERENCE SIGNS

[0029] 10 Suction hose [0030] 11 Free end of the suction hose [0031] 13, 13 Fastening point [0032] 20 Suction body [0033] 21 Suction dome [0034] 23 Suction slots [0035] 24 Suction aperture [0036] 25 Suction channel [0037] 26 Latching lugs [0038] 27 Carrier piece [0039] 28 Connection region [0040] 29 Internal thread [0041] 30, 30 Fastening element [0042] 31, 31 Retaining clip [0043] 33 Eye [0044] 35 Holding arms [0045] 100 Suction-extraction device [0046] 200 Demolition hammer [0047] 210 Housing [0048] 211, 211 Mounting opening [0049] 220 Tool fitting [0050] 250 Demolition chisel [0051] AB Working region [0052] AR Axial direction [0053] DM Diameter [0054] HF Manual actuating force [0055] LS Length of the suction hose [0056] RR Radial direction [0057] SP Pivot point [0058] UR Circumferential direction [0059] VF Preloading force