TOOL FOR A MOBILE MACHINE TOOL

Abstract

A tool for a mobile power tool, for machining rock or mineral materials, comprises a shaft and a tool head, wherein a suction-extraction channel for transporting rock dust is formed at least along a part of the shaft. The tool head and a channel element, which are arranged longitudinally at least along a part of the shaft of the tool, are couplable and/or are coupled to the shaft in a releasable manner.

Claims

1. A tool for a mobile power tool for machining rock or mineral materials, the tool comprising a shaft and a tool head, wherein a suction-extraction channel for transporting rock dust is formed at least along a part of the shaft, and wherein the tool head and a channel element, which are arranged longitudinally at least along a part of the shaft of the tool are couplable and/or are coupled to the shaft in a releasable manner.

2. The tool as claimed in claim 1, wherein the tool head has an inlet channel.

3. The tool as claimed in claim 1, wherein a lateral channel is formed between the channel element and the tool head.

4. The tool as claimed in claim 1, wherein the tool has a suction-extraction funnel which is designed to guide into the suction-extraction channel rock dust flowing in from a direction of the tool head.

5. The tool as claimed in claim 1, wherein the cross-sectional area of the suction-extraction channel is increased in a region of the shaft in a direction pointing away from the tool head.

6. The tool as claimed in claim 1, wherein the channel element is designed in multiple parts and/or is designed to be able to be swung open.

7. The tool as claimed in claim 1, wherein the channel element is designed as a sleeve element which encloses the shaft.

8. The tool as claimed in claim 1, wherein the channel element is designed as a covering element which covers over the shaft only in certain regions.

9. The tool as claimed in claim 1, wherein the shaft has at least one suction-extraction groove by which at least one part of the suction-extraction channel is formed and/or can be formed.

10. The tool as claimed in claim 1, wherein the tool has at least one spacer for maintaining a suction-extraction space between the shaft and the channel element.

11. The tool as claimed in claim 1, wherein the tool head is coupled and/or is couplable to the shaft in a releasable manner by a wedge, by at least one wedge surface and/or by a thread.

12. The tool as claimed in claim 1, wherein the tool head is coupled and/or is couplable to the shaft in a releasable manner by a coupling pin.

13. The tool as claimed in claim 1, wherein the tool has a suction-extraction adapter and/or the tool can be connected to a suction-extraction adapter.

14. The tool as claimed in claim 1, wherein a shank arranged at an end of the shaft situated opposite to the tool head is coupled and/or is couplable to the shaft in a releasable manner.

15. The tool as claimed in claim 5, wherein the cross-sectional area of the suction-extraction channel is increased in an end region of the shaft in the direction pointing away from the tool head.

16. The tool as claimed in claim 6, wherein the channel element is able to be swung open longitudinally.

17. The tool as claimed in claim 8, wherein the covering element consists of an elastic material, plastic, and/or a rubber.

18. The tool as claimed in claim 2, wherein a lateral channel is formed between the channel element and the tool head

19. The tool as claimed in claim 2, wherein the tool has a suction-extraction funnel which is designed to guide into the suction-extraction channel rock dust flowing in from a direction of the tool head.

20. The tool as claimed in claim 5, wherein the cross-sectional area of the suction-extraction channel is increased in the region of the shaft in the direction pointing away from the tool head.

Description

[0033] In the schematic drawing, exemplary embodiments of the invention are shown and explained in more detail in the following description.

[0034] In the figures:

[0035] FIG. 1 shows a perspective illustration of a tool having a suction-extraction adapter;

[0036] FIG. 2 shows a longitudinal sectional view of a detail of a further tool;

[0037] FIGS. 3 to 5 show longitudinal sectional views of details of tools having suction-extraction funnels;

[0038] FIG. 6 shows a longitudinal sectional view of a detail of a tool in which the tool head has a plurality of inlet channels;

[0039] FIG. 7 shows a longitudinal sectional view of a detail of a tool in which a plurality of channel elements are designed as covering elements; and

[0040] FIG. 8 shows a cross-sectional view of the tool according to FIG. 7.

[0041] In order to make it easier to understand the invention, the same reference signs are used in each case for identical or functionally corresponding elements in the following description of the figures.

[0042] FIG. 1 shows a tool 10. The tool 10 takes the form of a rock drill bit. It can be used with a mobile power tool for machining rock or mineral materials. The tool 10 comprises a shaft 12 and a tool head 14. The tool head 14 is coupled to the shaft 12 in a releasable manner in a way which will be described in further detail below. Along the shaft 12 there is formed a suction-extraction channel 16 for transporting rock dust away from the region of the tool head 14. For this purpose, the tool 10 has a channel element 18 which extends longitudinally along the shaft 12. The channel element 18 encloses the shaft 12. The channel element 18 is thus designed as a sleeve element. The channel element 18 is pushed onto the shaft 12 and thus coupled releasably thereto.

[0043] A shank 20 is formed on the shaft 12 at the end of the shaft 12 situated opposite to the tool head 14. The shank 20 can, for example, correspond to the standard which is customarily designated by SDS-Max.

[0044] It can further be seen that a suction-extraction adapter 22 is arranged adjacent to the shank 20. The suction-extraction adapter 22 can be connected to a suction-extraction device. The suction-extraction adapter 22 is fluidically connected to the suction-extraction channel 16. The suction-extraction adapter 22 encloses the shaft 12 together with the channel element 18. The shaft 12 is mounted in the suction-extraction adapter 22 in a rotatable manner together with the channel element 18.

[0045] Further exemplary embodiments of tools 10 are presented below. Unless mentioned otherwise, these tools 10 can correspond to the above-described exemplary embodiment and in particular also have one or more of the above-described features. In the following, primarily special features of the respective exemplary embodiments will therefore be explained in more detail.

[0046] FIG. 2 is a partially sectioned longitudinal sectional view showing a portion of a further tool 10. Its tool head 14 has a tool tip 24 with a plurality of cutting edges 26.

[0047] At the end of the tool head 14 situated opposite to the tool tip 24, said tool head has splines 28 which interact with a complementarily formed spline receptacle 30 of the shaft 12 in order to releasably couple the tool head 14 to the shaft 12. To further secure the coupling of the tool head 14 to the shaft 12, this embodiment of the tool 10 has a coupling pin 32 which is plugged into a pin receptacle 34 of the shaft 12. The coupling pin 32 is formed here as a slit hollow pin made of spring steel. Alternatively, however, it is also conceivable to form it, for example, as a notched pin, as a conical pin, as a screw or to form it to have at least one thread.

[0048] In this tool 10, a lateral channel 36 is formed between the tool head 14 and a channel element 18. The lateral channel 36 is designed to be annular. It encloses a part of the end of the shaft 12 that faces the tool head 14. The lateral channel 36 can have a width of at least 2 mm, preferably of at least 3 mm.

[0049] Rock dust from the tool tip 24 with the cutting edges 26 can be sucked through the lateral channel 36 laterally past the tool head 14 and pass into the suction-extraction channel 16.

[0050] It can be seen here in particular that in the mounted state of the tool 10 illustrated in FIG. 2, the cross-sectional area of the lateral channel 36 is substantially smaller than the cross-sectional area of the remaining suction-extraction channel 16. In other words, the cross-sectional area of the suction-extraction channel 16 increases in the region of the shaft 12 starting from the lateral channel 36 to the remaining suction-extraction channel 16 in the direction pointing away from the tool head 14.

[0051] FIG. 3 is a further partially sectioned longitudinal sectional view showing a detail of a further tool 10 having a suction-extraction funnel 38. In this exemplary embodiment, the suction-extraction funnel 38 is part of a channel element 18. In other words, the suction-extraction funnel 38 is formed in one piece on the channel element 18. It is situated at the end of the channel element 18 that faces the tool head 14.

[0052] FIG. 4 is a partially sectioned longitudinal sectional view showing a detail of a further exemplary embodiment of a tool 10 which also has a suction-extraction funnel 38. In this exemplary embodiment, however, the suction-extraction funnel 38 is formed as a separate element. It can be pluggable and/or it can be plugged onto a channel element 18.

[0053] A further exemplary embodiment in which a suction-extraction funnel 38 is formed as a separate element is shown in FIG. 5 in a further partially sectioned longitudinal sectional view of a detail of a further tool 10.

[0054] What can be seen in this exemplary embodiment, by contrast with the preceding exemplary embodiment, is that the suction-extraction funnel 38 can also be designed to extend a channel element 18, at least over a part of a tool head 14, in a direction parallel to a shaft 12. As a result, the suction action of a negative pressure prevailing in a suction-extraction channel 16 can be improved. This is appropriate, for example, in the case of relatively large tool heads 14.

[0055] FIG. 6 is a longitudinal sectional view showing a further tool head 14 in conjunction with a shaft 12, which is only partially depicted in FIG. 6.

[0056] A plurality of, for example 2, 3 or 4, inlet channels 40 are formed in the tool head 14. It is also conceivable to provide only a single inlet channel 40. The inlet channels 40 run through the tool head 14. They connect a tool tip 24 of the tool head 14 to a suction-extraction channel 16.

[0057] The suction-extraction channel 16 is formed as a central longitudinal opening in the shaft 12. For this purpose, the shaft 12 is formed from two half-shells. The two half-shells can be releasably coupled to one another by way of a connection means, for example a strap or a latching arrangement, which, for reasons of simplification, is not illustrated in FIG. 6. Consequently, at least one of the two half-shells simultaneously forms a channel element 18.

[0058] The tool head 14 is releasably coupled to the shaft 12 by means of a plurality of coupling pins 32 in conjunction with pin receptacles 34 formed in a complementary manner on the shaft 12.

[0059] Whereas in the previous exemplary embodiments the channel elements 18 are designed as sleeve elements, FIG. 7 and FIG. 8 show an exemplary embodiment in which channel elements 18 are designed as covering elements.

[0060] For this purpose, FIG. 7 shows a longitudinal sectional view of the exemplary embodiment. FIG. 8 shows a cross-sectional view corresponding to the section line VIII-VIII from FIG. 7 of this exemplary embodiment.

[0061] There can again be seen a tool head 14 which is releasably coupled to a shaft 12. The shaft 12 has an at least substantially circular cross section. It is conceivable alternatively that the shaft 12 has a, not even substantially, noncircular cross section. For example, the shaft 12 can have a polygonal cross section or an at least substantially polygonal cross section.

[0062] On the circumference of the shaft 12 there are formed two suction-extraction channels 16 which run along a longitudinal axis of the shaft 12. For this purpose, two suction-extraction grooves 42 are incorporated in the shaft 12. As can be seen in particular by way of FIG. 8, the suction-extraction grooves 42 are covered over by a respective channel element 18. In other words, the channel elements 18 are designed as covering elements which are configured to cover over the suction-extraction grooves 42.

[0063] For this purpose, the suction-extraction grooves 42 are shaped in cross section to be complementary to the channel elements 18 designed as covering elements. As can be seen in particular by way of FIG. 8, the lateral walls of the suction-extraction grooves 42, on the one hand, and of the channel elements 18, on the other hand, run obliquely, in particular along noncentral chords. The suction-extraction grooves 42 and the channel elements 18 thus have dovetail profiles, which are formed in particular to be complementary to one another, with the result that the elements 18 and 42 are releasably couplable to one another in the manner of dovetail connections, and are coupled according to the state illustrated in FIG. 7 and FIG. 8.

[0064] The channel elements 18 are formed from an elastic plastic. In an alternative embodiment, they are formed from an elastic rubber.

[0065] In order to be able to couple the tool head 14 to the shaft 12 in a rotationally secured manner, there are furthermore incorporated a plurality of coupling grooves 44 on the circumference of the shaft 12 into which complementarily formed coupling lugs 46 of the tool head 14 can engage, or do engage in the state according to FIG. 7 and FIG. 8.

[0066] Analogously to the above-described exemplary embodiments, the tool head 14 likewise has one or more inlet channels 40. However, in order to allow a fluidic connection from the inlet channels 40 to the respectively assigned suction-extraction channels 16, the inlet channels 40 run flatter in the longitudinal direction of the shaft 12, with the result that they can run out in the region of the circumference of the shaft 12 and open into the respective suction-extraction channels.

[0067] It will be understood that the embodiments of tool heads 14 that are illustrated in these exemplary embodiments can be combined in any desired manner, in particular not only in the above-illustrated pairings, with the above-illustrated shafts 12, where appropriate with suitable adaptation of the geometries. Thus, for example, a combination of a tool head 14 having one or more inlet channels 40 with a shaft 12 having a suction-extraction funnel 38 is also conceivable.