The present invention relates to a suction-extraction device for a demolition hammer, wherein the demolition hammer has a housing and a tool fitting for receiving a demolition chisel. The suction-extraction device is equipped with a flexible suction hose on whose free end there is connected a suction body. Dust can be sucked up from a working region of the demolition chisel via the suction body.
Suction-extraction devices of this kind are known in principle from the prior art. Thus, during heavy demolition work, use is made for example of a suction body in the form of a suction sleeve which is fitted over the demolition chisel.
It is an object of the present invention to provide a suction-extraction device which promotes safe operation for the user.
The present invention provides that the suction-extraction device has a fastening element by means of 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, in particular in the radial direction. It has proved to be advantageous if the fastening point of the suction hose defines a pivot point around which the suction hose together with suction body can be pivoted.
The invention includes the finding that it is disadvantageous with suction-extraction devices of the prior art that the suction body has to be fitted over the demolition chisel. The disadvantage lies in the fact that, if, for example, chiseling over an edge or into the extracted material occurs, the suction-extraction body can fall down and even be destroyed. A further disadvantage lies in the fact that the user's view of a cutting edge of the demolition chisel is prevented or at least considerably restricted. Furthermore, with increasing wear of the demolition chisel, use of the suction-extraction body is typically no longer possible since it can slip down from the demolition chisel.
By contrast thereto, there is provision according to the invention for an improved suction-extraction device whose suction body during suction operation can be freely pivoted with respect to the demolition chisel, at least in the radial direction. This has the crucial advantage of at all times making it possible to have a free view of the demolition chisel, which is important in particular in the case of a heavy demolition hammer. User safety is considerably increased as a result. The possibility of pivoting the suction body relative to the demolition chisel additionally prevents a situation in which the suction-extraction body slips axially toward the demolition chisel or is even destroyed. Specifically, it has proved practically impossible to jam the suction-extraction body when chiseling for instance on an edge or in the extracted material. As a result, continuous suction-extraction of dust from the working region of the demolition chisel—and hence also the health of the user—is ensured at all times.
In a particularly preferred embodiment, the fastening element takes the form of a retaining clip (spring clip). It has proved to be advantageous if the retaining clip has an eye which is designed to preferably completely clamp around the suction hose. In a further preferred embodiment, a diameter of the eye can be widened by a manual actuation, preferably in such a way that the eye can be displaced along a length of the suction hose. It is thus possible as a result for the position, in particular the axial position, of the suction body to be changed relative to the demolition chisel. Thus, the position of the suction body can be simply adjusted to any wear of the demolition chisel. It has proved to be advantageous if a manual actuation occurs counter to spring preloading applied by the retaining clip.
It has proven to be advantageous if the retaining clip has two holding arms. In a particularly preferred embodiment, the holding arms are designed to engage in two mounting openings in the housing of the demolition hammer. A mounting opening can be, for example, a cutout in the housing in which, for example, a housing screw is sunk. In a particularly preferred embodiment, the already described spring preloading applied by the retaining clip serves to hold the holding arms in the respective mounting opening. In a further preferred embodiment, a further fastening element in the form of a retaining clip is provided.
In a further preferred embodiment, the suction body has a suction dome. The suction dome can have a suction slot which extends in the axial direction along the suction dome. In a particularly preferred embodiment, the suction slot opens into a suction channel situated in the interior of the suction dome. It has proved to be advantageous if the suction dome has a plurality of suction slots. In a particularly preferred embodiment, the suction slots are arranged uniformly spaced apart from one another along a circumferential direction of the suction dome. In a further preferred embodiment, each of the suction slots opens into a respective suction channel.
In a likewise preferred embodiment, the suction body has a carrier piece to which the suction hose can be fastened on one side and the suction dome on the other side. It has proved to be advantageous if the suction channels for their part open into a connection region of the carrier piece. In a particularly preferred embodiment, the connection region of the carrier piece opens into the suction hose. It has proved to be advantageous if the carrier piece has a plurality of latching lugs which are arranged uniformly spaced apart from one another along the circumferential direction of the carrier piece. The carrier piece can be re-releasably connected to the suction dome by means of the latching lugs.
It has furthermore proved to be advantageous if the carrier piece has an internal thread into which the suction hose can be screwed. In a particularly preferred embodiment, the suction dome and the carrier piece are joined to one another, for example via a press fit. It has proved to be advantageous if the suction dome and the carrier piece are designed as different components. The suction dome and the carrier piece can be provided in one piece, for example by means of an additive manufacturing method. It has proved to be advantageous if, during the intended suction operation, the suction body does not enclose the demolition chisel.
The invention is also achieved by the use of a suction-extraction device of the above-described type for sucking up dust from a working region of a demolition chisel which is received in a tool fitting of a demolition hammer.
Subject matter which can be protected independently is provided by a suction-extraction device for an electric hand-held power tool, wherein the electric hand-held power tool has a housing and a tool fitting for receiving a tool, 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 tool, and wherein the suction-extraction device has a fastening element by means of which the suction hose can be mounted on the housing of the electric hand-held power tool 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 tool, at least in the radial direction.
Further advantages will become apparent from the following description of the figures. Various exemplary embodiments of the present invention are illustrated in the figures. The figures, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.
Identical and similar components are denoted by the same reference signs in the figures, in which:
A first preferred exemplary embodiment of a suction-extraction device 100 according to the invention is illustrated in
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
As can be gathered from
With reference to
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.
It can clearly be seen in
Number | Date | Country | Kind |
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20209695.4 | Nov 2020 | EP | regional |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2021/081055 | 11/9/2021 | WO |