Modular chiseling tool

Abstract

The invention relates to a tool (10) for the chiseling extraction of rock, in particular a hammer drill or chisel, comprising at least one shaft (12) to which a tool head (14) is coupled at one end and to which an insertion end (16) is formed at the other end. The tool head (14) is coupled to the shaft (12) and the tool head (14) is displaceably mounted on the shaft (12) along a longitudinal axis (L) of the shaft (12). The invention further relates to a tool head (14) and a shaft (12). The tool (10) can have a long service life despite a modular design.

Description

[0001] The invention relates to a tool for the chiseling extraction of rock, comprising a shaft, a tool head, and a shank. The shank 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.

[0002] 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.

[0003] 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.

[0004] For such modular tools, solutions based on screw connections or bayonet locks have been developed.

[0005] 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.

[0006] The object of the present invention is therefore to offer a modular tool of the type mentioned above which has a long service life and a high mining performance.

[0007] The object is achieved by a tool for the chiseling extraction of rock with at least one shaft to which a tool head is coupled at one end and an insertion end is formed at the other end, wherein the tool head is coupled to the shaft, wherein the tool head is displaceably mounted on the shaft along a longitudinal axis of the shaft.

[0008] 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.

[0009] One idea underlying the invention is to arrange the tool head on the shaft with a certain amount of play along the longitudinal axis. If 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 end faces make large-area contact. Impact energy can be transferred from one end face to the other. The energy transfer can take place 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. This allows the tool to have a long service life. Because energy losses in the boundary area are only minimal, the tool can achieve high mining performance.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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 be effected by locking.

[0014] For coupling, at least one coupling groove running parallel to the longitudinal axis can be formed on the tool head and / or the shaft. The locking element or a part thereof, for example, the sliding block or the ball, can then be arranged displaceably in the coupling groove along the longitudinal axis.

[0015] The coupling groove can have a bevel on at least one of its end faces. This allows, for example, the tool head or the insertion end to be decoupled from the shaft by sliding it out of a coupling position. In particular, the locking element or part of it can then be pushed out of the coupling groove along the bevel, provided sufficient force is applied. The bevel can thus form a kind of ramp for the locking element.

[0016] For coupling, the tool can further comprise 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.

[0017] 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.

[0018] The scope of the invention also includes a tool head for the tool described above. The tool head may have a head coupling section.

[0019] 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.

[0020] The invention further includes a shank for a tool of the type described above. The shank may have a shank coupling portion. The shank coupling portion may be configured for detachable coupling, particularly without the use of tools, to the head coupling portion of the tool head.

[0021] 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.

[0022] The schematic drawing shows embodiments of the invention and explains them in more detail in the following description. They show:

[0023] Figure 1 shows a tool in a side view with the tool head removed; Figure 2 shows the tool according to Figure 1 in a sectional view according to section II of Figure 1 ; Figure 3 the tool according to Figure 1 in a sectional view according to section III of Figure 1 ; Figure 4 a detailed view of area IV from Figure 2 ; Figure 5 another tool in a side view; Figure 6 the tool according to Figure 5 in a longitudinal section view according to section VI of Figure 5 ; Figure 7 another tool in a side view; Figure 8 the tool according to Figure 7 in a longitudinal section according to the section VIII out of Figure 7 ; Figure 9 a cross-sectional view of the tool according to Figure 7 according to section IX from Figure 7; Figure 10 a cross-sectional view of the tool according to Figure 7 according to section X from Figure 7 ; Figure 11 another tool including a suction nozzle in a side view; Figure 12 the tool according to Figure 11 in a front view; Figure 13 the tool according to Figure 11 in a longitudinal section view according to section VII of Figure 12 ; Figure 14 a detailed view of the tool according to Figure 11 to area XIV according to Figure 12 and Figure 15 a detailed view of the tool according to Figure 11 to area XV according to Figure 12 .

[0024] 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.

[0025] Figures 1, 2, 3 and 4 show a first tool 10 for chiseling rock removal. The tool 10 is designed as a hammer drill. It comprises a shaft12. At one end of the shaft 12 there is a tool head 14 coupled.

[0026] At the other end of the shaft 12 is a shank 16 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.

[0027] 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.

[0028] For example, based on Figure 2 As can be seen, 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.

[0029] Based on Figure 3 It can be seen 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 of a complementary design. 20 The coupling socket 20 has a central opening 22 with a hexagonal cross-section.

[0030] For coupling the tool head 14 with the shaft 12, the tool 10 has a locking element in the area of ​​the coupling bushing 20 24 In this embodiment, the locking element 24 has several, in particular six, balls arranged radially around the opening 22 26, of which, to simplify the presentation, Figure 3 only one ball is provided with a reference symbol, and a spring element 28, in particular a spring ring.

[0031] The balls 26 sit in the spring element 28. The spring element 28 is expandable.

[0032] In the detailed view according to Figure 4 It can be seen that on the shaft 12, in particular at its coupling end 29, at which it can be coupled to the tool head 14, a coupling groove 30 The coupling groove 30 is formed in this embodiment 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.

[0033] 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.

[0034] 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.

[0035] The other figures show further embodiments of tools 10. Unless otherwise stated, these tools 10 can be used analogously to the tool 10 according to the Figures 1 to 4 Therefore, only the specific features of the embodiments will be discussed in more detail below.

[0036] Figures 5 and 6show a further 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 parallel to the longitudinal axis L, through grooves 32 running channels 34 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.

[0037] Figures 7, 8, 9 and 10 show another tool 10 or sectional views of the tool 10.

[0038] As can be seen in particular from the Figure 9As can be seen, this tool 10 also has suction channels 18 formed by means of 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 sucked away.

[0039] 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 is effected in a similar manner to the coupling of the tool head 14 by means of a locking element 24. In particular, the coupling is also effected by means of a spring element 28 into which balls 26 are embedded. Again, to simplify the illustrations in the Figures 9 and 10 only the spring element 28 and one of the balls 26 are provided with a reference symbol.

[0040] For example, based on Figure 8As can be seen, 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.

[0041] 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.

[0042] Figures 11, 12, 13 , 14 and 15 show another tool 10 or sectional views of the tool 10.

[0043] The tool 10 is connected to a suction nozzle 36The suction nozzle 36 is arranged at one end of the suction channels 18 of the shaft 12. The suction nozzle 36 can, for example, be connected to a Figures 11 to 15 A suction device (not shown) can be connected. The suction device can suck up, collect, and / or remove particles passing through the suction channels 18.

[0044] Based on the Figures 13 , 14 and 15 It can be seen that in this embodiment, too, both the tool head 14 and the insertion end 16 can be coupled to the shaft 12.

[0045] This embodiment has a Figures 14 or 15 shown alternative coupling mechanism 38 on.

[0046] 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.

[0047] The locking element 24 in turn has a spring element 28, through which two sliding blocks 40 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.

[0048] The coupling groove 30 has a bevel on at least one of its end faces 42 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. List of reference symbols

[0049] 10Tool 12Shaft 14Tool head 16Insertion end 18Suction channel 20Coupling bush 22Opening 24Detent element 26Balls 28Spring element 29Coupling end 30Coupling groove 32Grooves 34Channel 36Extraction nozzle 38Coupling mechanism 40Sliding stone 42Bevel LLongitudinal axis IISection IIISection IVArea IXSection VISection VIISection VIIISection XSection XIVArea XVArea

Claims

1. Tools (10) for the chiseling extraction of rock, in particular a hammer drill or chisel, comprising at least one shaft (12) to which a tool head (14) is coupled at one end and 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 thatfor coupling, the tool (10) has at least one locking element (24), in particular comprising a ball (26) or a sliding block (40).

6. Tool (10) according to one of the preceding claims, characterized in that for coupling, 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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