Modular chiselling tool

Abstract

The invention relates to a tool (10) for removing rock by chiselling, in particular a hammer drill or a chisel, comprising at least one shank (12) to which a tool head (14) is coupled at one end and on which an insertion end (16) is formed at the other end, the tool head (14) being coupled to the shank (12), and the tool head (14) being mounted on the shank (12) so as to be slidable along a longitudinal axis (L) of the shank (12). The invention also relates to a tool head (14) and to a shank (12). The tool (10) can have a long service life despite a modular design.

Description

[0001] Modular chiseling tool

[0002] Description

[0003] The invention relates to a tool for the chiseling extraction of rock, comprising a shaft, a tool head, and an insertion end. The insertion end serves to connect the tool to a machine tool, for example, a mobile machine tool. To extract rock, the tool chisels, i.e., it repeatedly strikes the rock, particularly along its longitudinal axis, to crush it.

[0004] It has been a long-held desire to reduce the operating costs of such tools. It is also desirable to reduce material consumption due to wear and tear when performing work with such tools.

[0005] One approach to meeting these requirements is to design the tool modularly. If, for example, the tool head becomes worn, only that could be replaced. The remaining components of the tool could be reused or reused.

[0006] For such modular tools, solutions based on screw connections or bayonet locks have been developed.

[0007] However, existing solutions often pose problems. Due to energy conversion of the impact energy in the interface between the tool head and the shank due to insufficient transmission of impact energy from the shank to the tool head, this interface can heat up. The tool head and the shank can weld together, potentially rendering the entire tool unusable prematurely. Generally, these transmission losses have resulted in low wear performance of such tools.

[0008] The object of the present invention is therefore to provide a modular tool of the type mentioned above that has a long service life and high mining performance. This object is achieved by a tool for the chiseling extraction of rock, comprising at least one tool head and a shaft. A tool head is coupled to one end of the shaft and an insertion end is formed at another end of the shaft. The tool head is coupled to the shaft, and the tool head is displaceably mounted on the shaft along a longitudinal axis of the shaft.

[0009] The tool head is coupled to the shaft, so it can be removed from the shaft and, for example, a new tool head can be coupled to the shaft.

[0010] One idea underlying the invention is to arrange the tool head on the shaft with a certain amount of play along the longitudinal axis. When a user applies such a tool to rock to be mined, they usually have to press the tool against the rock with a certain amount of pressure. This moves the tool head and shaft towards each other until their respective impact surfaces make large-scale contact. For this purpose, the shaft has a shaft impact surface and the tool head has a tool head impact surface. Impact energy can be transferred from the shaft impact surface to the tool head impact surface. The energy transfer can occur with high efficiency. The boundary area does not heat up, or only heats up slightly. Welding of the tool head to the shaft can be avoided or at least significantly reduced. The tool can therefore have a long service life.Due to the only low energy losses in the limit range, the tool can achieve high removal performance.

[0011] The tool head impact surface is a surface of the tool head that is oriented to correspond with the shaft impact surface. In one embodiment, the shaft impact surface can be a front side of the end of the shaft that is associated with the tool head. In one configuration, the shaft impact surface is formed on an outer wall of the shaft. The tool head impact surface can be formed in a receiving space for the shaft. In one configuration, the tool head impact surface is formed on an outer wall of the tool head.

[0012] Using a tool with a suction channel, rock dust generated during operation can be extracted. Furthermore, air flowing through the suction channel can provide additional cooling to the interface, further reducing the risk of welding.

[0013] The suction channel can be formed using a groove in the shaft, for example, to avoid the costs associated with the very complex and time-consuming drilling of a through hole or a blind hole along the longitudinal axis of the shaft. The groove can be covered by a cover to form the suction channel. Alternatively or additionally, a hose or pipe can be arranged in the groove, forming the suction channel at least along a section of the tool. The suction channel can be formed in the shaft. It can also be formed in the tool head, allowing rock flour to be sucked out from the immediate vicinity of the mining site.

[0014] Drilling tools can be rotated around their longitudinal axis during chiseling. To transfer torque from the shaft to the tool head, it is advantageous if the shaft is connected, in particular coupled, to the tool head and / or the insertion end in a rotationally fixed manner. For this purpose, the shaft can have a polygonal, in particular hexagonal, cross-section, at least in the boundary area to the tool head and / or at a corresponding boundary area to the insertion end if the insertion end is coupled to the shaft.

[0015] The tool can be designed such that the tool head has a coupling bushing at the end facing the shaft. The coupling bushing has a receiving space for receiving the end of the shaft that is assigned to the tool head and is opposite the insertion end. The end of the shaft that faces the tool head is preferably designed to correspond to the receiving space so that it can be received by the receiving space.

[0016] In one embodiment, the tool is designed such that the end of the shaft associated with the tool head has a coupling bushing. The coupling bushing has a receiving space for receiving the end of the tool head associated with the shaft and thus facing the insertion end. This end of the tool head is preferably designed to correspond, in particular to the profile, to the receiving space, so that it can be received by the receiving space.

[0017] For coupling, the tool can have at least one locking element, in particular comprising a ball or a sliding block, so that the coupling can take place by locking. For coupling, at least one coupling groove running parallel to the longitudinal axis can be formed on the tool head and / or on the shaft. The locking element or a part thereof, for example the sliding block or the ball, can then be arranged displaceably along the longitudinal axis in the coupling groove. The coupling groove is preferably delimited in its longitudinal extent, i.e. in the direction of the longitudinal axis, by a boundary wall, preferably a front and a rear boundary wall, wherein the direction "rear" refers to a direction of the longitudinal axis towards the insertion end and "front" refers to a direction of the longitudinal axis away from the insertion end.The longitudinal extension of the coupling groove is dimensioned such that it extends beyond the locking element in the direction of the longitudinal axis, and the locking element engages in the coupling groove. Furthermore, the longitudinal extension and positioning of the coupling groove are such that the locking element can engage with the coupling groove while simultaneously ensuring that the shaft impact surface rests against the tool impact surface. For example, if the tool head is placed on the shaft, the locking element first engages the coupling groove before the shaft impact surface rests against the tool impact surface.

[0018] When the tool head and shaft are coupled, the locking element engages with the coupling groove. The aforementioned clearance exists between the locking element and the boundary wall, in particular the front and / or rear boundary wall. This means that when the shaft impact surface rests against the tool head impact surface, there is a gap between the locking element and the boundary wall of the coupling groove. Accordingly, the shaft impact surface and tool head impact surface can be spaced apart by a certain distance without removing the locking element from the coupling groove and disengaging the locking element from the coupling groove. This distance can be, for example, 2-5 mm, in particular 2-3 mm.

[0019] In one embodiment, a boundary wall, preferably the front and rear boundary walls if present, has a bevel. Then, for example, the tool head or the insertion end can be decoupled from the shaft by sliding it out of a coupling position. In particular, the locking element or its part can then be pushed out of the coupling groove along the bevel, provided sufficient force is applied. The bevel can thus form a type of ramp for the locking element. For coupling, the tool can further have at least one spring element. The spring element can comprise a spring ring. It is also conceivable for the spring element to comprise a spring coil.

[0020] The shank can also be coupled to the insertion end. The insertion end can thus also be detachable from the shank. The coupling can be achieved in the same way as the coupling of the tool head to the shank.

[0021] In one embodiment, the coupling groove can be formed as a continuous groove, i.e., it extends through the material of the component in which the groove is formed. In an alternative embodiment, the coupling groove is formed as a recess, i.e., the shaft or the tool head has a corresponding material taper that forms the coupling groove.

[0022] When designing the tool with a coupling bushing, either the coupling bushing can be designed with the above-mentioned coupling groove, or the end of the tool head or the shaft, which is received in the receiving space of the coupling bushing, can be designed with the coupling groove.

[0023] In one embodiment, the shaft has a hardness at least in a region near the tool head, in particular at the shaft impact surface, that corresponds at least to the hardness of the tool head adjacent to the shaft, in particular the tool head impact surface. Preferably, the hardness of the shaft impact surface is greater than the hardness of the tool head impact surface. In one embodiment, the hardness of the shaft impact surface is 450HV10.

[0024] The invention also includes a tool head for the tool described above. The tool head may have a head coupling section.

[0025] Furthermore, the tool head can have a suction channel. The suction channel can be configured to open into a suction channel of a tool shaft. Through the suction channel of the tool head, dust or other particles can be extracted directly from the area where they are generated.

[0026] The scope of the invention also includes a shank for a tool of the type described above. The shank may have a shank coupling section. The shank coupling section may be configured for detachable coupling, particularly without tools, to the head coupling section of the tool head.

[0027] Further features and advantages of the invention will become apparent from the following detailed description of exemplary embodiments of the invention, based on the figures of the drawing, which illustrate details essential to the invention, and from the claims. The features shown therein are not necessarily to scale and are presented in such a way that the special features of the invention can be clearly seen. The various features can be implemented individually or in combinations in variants of the invention.

[0028] The schematic drawing shows embodiments of the invention and explains them in more detail in the following description.

[0029] They show:

[0030] Figure 1 shows a tool in a side view with the tool head removed;

[0031] Figure 2 shows the tool according to Figure 1 in a sectional view according to section II of Figure 1;

[0032] Figure 3 shows the tool according to Figure 1 in a sectional view according to section III of Figure 1;

[0033] Figure 4 is a detailed view of area IV from Figure 2;

[0034] Figure 5 shows another tool in a side view;

[0035] Figure 6 shows the tool according to Figure 5 in a longitudinal sectional view according to section VI of Figure 5;

[0036] Figure 7 shows another tool in a side view;

[0037] Figure 8 shows the tool according to Figure 7 in a longitudinal sectional view according to section VIII of Figure 7;

[0038] Figure 9 is a cross-sectional view of the tool according to Figure 7 according to section IX of Figure 7;

[0039] Figure 10 is a cross-sectional view of the tool according to Figure 7 along section X in Figure 7;

[0040] Figure 11 shows another tool including a suction nozzle in a side view;

[0041] Figure 12 shows the tool according to Figure 11 in a front view;

[0042] Figure 13 shows the tool according to Figure 11 in a longitudinal sectional view according to section VII of Figure 12;

[0043] Figure 14 is a detailed view of the tool according to Figure 11 onto the area XIV according to Figure 12 and

[0044] Figure 15 is a detailed view of the tool according to Figure 11 onto the area XV according to Figure 12.

[0045] In the following description of the figures, the same reference numerals are used for identical or functionally corresponding elements to facilitate understanding of the invention.

[0046] Figures 1, 2, 3, and 4 show a first tool 10 for chiseling rock. The tool 10 is designed as a hammer drill. It comprises a shaft 12. A tool head 14 is coupled to the shaft 12 at one end.

[0047] At the other end of the shaft 12, a shank end 16 is formed. The shank end 16 can be designed according to a standard known, for example, as "SDS plus," "SDS max," or the like. Using the shank end 16, the tool 10 can be connected to a mobile power tool, for example, an electro-pneumatic hammer drill.

[0048] The tool head 14 is coupled to the shaft 12. It can be detached from the shaft 12. This allows the tool head 14 to be replaced with another tool head 14, for example, if it is worn. It is also conceivable for the other tool head 14 to have a different design. It is also conceivable to use the same shaft 12 to construct, for example, a chisel tool and a hammer drill tool.

[0049] As can be seen, for example, from Figure 2, the tool 10 has a suction channel 18. In this embodiment, the suction channel 18 runs centrally along a longitudinal axis L of the shaft 12.

[0050] Figure 3 shows that the shaft 12 is connected to the tool head 14 in a rotationally fixed manner. For this purpose, the shaft 12 has a hexagonal cross-section. The tool head 14 has a coupling bushing 20 of complementary design. The coupling bushing 20 has a central opening 22 with a hexagonal cross-section. To couple the tool head 14 to the shaft 12, the tool 10 has a locking element 24 in the region of the coupling bushing 20. In this exemplary embodiment, the locking element 24 has a plurality of, in particular six, balls 26 arranged radially around the opening 22, of which only one ball is provided with a reference number to simplify the illustration in Figure 3, as well as a spring element 28, in particular a spring ring.

[0051] The balls 26 sit in the spring element 28. The spring element 28 is expandable.

[0052] In the detailed view according to Figure 4, it can be seen that a coupling groove 30 is formed on the shaft 12, in particular at its coupling end 29, where it can be coupled to the tool head 14. In this exemplary embodiment, the coupling groove 30 is formed as a radially circumferential constriction on the shaft 12. It is longer along the longitudinal direction L than the diameter of the balls 26. In particular, the coupling groove 30 thus runs parallel to the longitudinal axis L.

[0053] When the tool head 14 is pushed onto the shaft 12, the locking element 24 can engage the coupling groove 30. The balls 26 can be moved within the coupling groove 30. Thus, the tool head 14 is coupled to the shaft 12 and yet is mounted on the shaft 12 so that it can be moved along the longitudinal axis L of the shaft 12.

[0054] By pulling the tool head 14 from the shaft 12 with sufficient force, the tool head 14 can be decoupled from the shaft 12 and thus released.

[0055] The following figures show further exemplary embodiments of tools 10. Unless otherwise stated, these tools 10 can be designed analogously to the tool 10 according to Figures 1 to 4. Therefore, only special features of the exemplary embodiments will be discussed in more detail below.

[0056] Figures 5 and 6 show another tool 10. A special feature of this embodiment is that the tool 10 has one or more, for example 2, 3, 4, 5, 6, 7, or 8, suction channels 18. The suction channels 18 are designed as channels 34 running parallel to the longitudinal axis L and extending through grooves 32. For this purpose, the grooves 32 are formed on an outer side of the shaft 12. Here, too, to simplify the illustration, only one of the suction channels 18 and only one of the grooves 32 and the channels 34 are provided with reference numerals.

[0057] Figures 7, 8, 9 and 10 show another tool 10 and sectional views of the tool 10, respectively.

[0058] As can be seen particularly from Figure 9, this tool 10 also features suction channels 18 formed by grooves 32 in the shaft 12. In this embodiment, the channels 34 line the grooves 32. They form tubes through which accumulating particles can be suctioned away.

[0059] In this embodiment, both the tool head 14 and the insertion end 16 are coupled to the shaft 12. The coupling of the insertion end 16 takes place in a manner analogous to the coupling of the tool head 14, using a locking element 24. In particular, the coupling also takes place using a spring element 28 into which balls 26 are embedded. Again, to simplify the illustrations in Figures 9 and 10, only the spring element 28 and one of the balls 26 are provided with a reference symbol.

[0060] As can be seen, for example, from Figure 8, the tool head 14 also has suction channels 18. The suction channels 18 are connected to those of the shaft 12, so that particles entering at the tip of the tool head 14 can pass through it and into the suction channels of the shaft 12.

[0061] The tool head 14 comprises a hard metal, for example, tungsten carbide. The suction channels 18 of the tool head 14 can, for example, be drilled into it. It is also conceivable for the tool head 14 to be manufactured by sintering. In this case, its suction channels 18 can already be embossed into a green body of the tool head 14. For this purpose, the green body can be formed, for example, using a suitable 3D printing process.

[0062] Figures 11, 12, 13, 14 and 15 show another tool 10 and sectional views of the tool 10, respectively.

[0063] The tool 10 is connected to a suction nozzle 36. The suction nozzle 36 is located at one end of the suction channels 18 of the shaft 12. The suction nozzle 36 can, for example, be connected to a suction device (not shown in Figures 11 to 15). The suction device can suction out, collect, and / or remove particles passing through the suction channels 18.

[0064] From Figures 13, 14 and 15 it can be seen that in this embodiment also both the tool head 14 and the insertion end 16 can be coupled to the shaft 12.

[0065] This embodiment has an alternative coupling mechanism 38 shown in Figures 14 and 15, respectively.

[0066] In this embodiment, a locking element 24 is located in the shaft 12 and engages in a coupling groove 30 of the tool head 14 or the insertion end 16.

[0067] The locking element 24, in turn, has a spring element 28 through which two sliding blocks 40 move radially outward and thus, when the shaft 12 is coupled to the tool head 14 or to the insertion end 16, into the respective coupling groove 30. One or more balls 26 can be accommodated in the spring element, in particular to improve the bearing in the shaft 12.

[0068] The coupling groove 30 has a bevel 42 on at least one of its boundary walls (in the embodiment of Fig. 14, on a rear boundary wall). The bevel can form a ramp so that the locking element 24 and thus the tool head 14 or the insertion end 16 can be removed from the shaft 12 with little effort.

[0069] List of reference symbols

[0070] 10 tools

[0071] 12 shaft

[0072] 14 Tool head

[0073] 16 shank ends

[0074] 18 suction channel

[0075] 20 coupling socket

[0076] 22 Opening

[0077] 24 locking element

[0078] 26 balls

[0079] 28 spring element

[0080] 29 Coupling end

[0081] 30 coupling groove

[0082] 32 grooves

[0083] 34 channels

[0084] 36 suction nozzles

[0085] 38 Coupling mechanism

[0086] 40 sliding block

[0087] 42 Bevel

[0088] L Longitudinal axis

[0089] 11 cut

[0090] III Cut

[0091] IV Area

[0092] IX Cut

[0093] VI Cut

[0094] VII Cut

[0095] VIII Cut

[0096] X cut

[0097] XIV Area

[0098] XV Area

Claims

Patent claims 1. Tool (10) for chiseling rock, in particular a hammer drill or chisel, comprising at least one tool head and a shaft (12), to which the tool head (14) is coupled at one end and to which an insertion end (16) is formed at the other end, wherein the tool head (14) is coupled to the shaft (12) and wherein the tool head (14) is displaceably mounted on the shaft (12) along a longitudinal axis (L) of the shaft (12).

2. Tool (10) according to the preceding claim, characterized in that the tool (10) has a suction channel (18).

3. Tool (10) according to one of the preceding claims, characterized in that the suction channel (18) is formed by means of a groove (32) of the shaft (12).

4. Tool (10) according to one of the preceding claims, characterized in that the shaft (12) is connected to the tool head (14) and / or to the insertion end (16) in a rotationally fixed manner.

5. Tool (10) according to one of the preceding claims, characterized in that for coupling the tool (10) has at least one locking element (24), in particular a ball (26) or a sliding block (40).

6. Tool (10) according to one of the preceding claims, characterized in that for coupling purposes at least one coupling groove (30) running parallel to the longitudinal axis (L) is formed on the tool head (14) and / or on the shaft (12).

7. Tool (10) according to one of the preceding claims, characterized in that the coupling groove (30) has a bevel (42) on at least one of its end faces.

8. Tool (10) according to one of the preceding claims, characterized in that the tool (10), in particular for coupling, has at least one spring element (28).

9. Tool (10) according to one of the preceding claims, characterized in that the shaft (12) is coupled to the insertion end (16).

10. Tool head (14) for a tool (10) according to one of the preceding claims.

11. Tool head (14) according to the preceding claim, characterized in that the tool head (14) has a suction channel (18).

12. Shaft (12) for a tool (10) according to one of claims 1 to 8.

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