Chisel tool with a textured section

Description

[0001] The present invention relates to a chisel tool, in particular for a hand-held power tool, comprising a tool tip having at least one wedge surface and a tool shank.

[0002] When chiseling rock, for example, when chiseling cementitious rock, with a chiseling tool of the type described above, the chiseling tool often becomes stuck in the rock. Such a situation is particularly common when the chiseling tool is used with powerful hand tools, such as electrically and / or pneumatically operated hand tools.

[0003] EP 2 540 451 A2 discloses a chisel tool with a chisel head, a chisel shank, and an insertion end. The chisel head has at least one replacement cutting edge axially offset from its chisel cutting edge. The replacement cutting edge can be angled relative to a reference axis extending transversely to a longitudinal axis of the chisel tool.

[0004] DE 20 2004 012846 U1 also discloses a chisel tool.

[0005] There is therefore a long-held desire in the professional world to have a chiseling tool of the type mentioned above that reduces the risk of jamming during chiseling, especially when chiseling in rock. This desire forms the basis of the present invention.

[0006] The object is achieved in a manner that is as simple as it is surprising by a chisel tool, in particular for a hand-held power tool, comprising a tool tip having at least one wedge surface and a tool shank, wherein the chisel tool is designed as a pointed chisel and wherein the tool shank has a structured section on the circumference, wherein the structured section has at least one rib and wherein the at least one rib runs inclined at an angle of inclination of at least 45°, preferably 60°, relative to a longitudinal direction of the chisel tool.

[0007] The invention is based on the surprising discovery that the structured section, due to the vibration typically occurring during operation of the chisel tool, can contribute to creating additional clearance along the tool shank, or at least along a portion of the tool shank, within the chisel hole created by the chisel tool during operation. This additional clearance can then prevent the chisel tool from becoming stuck in the rock, particularly on the walls of the chisel hole.

[0008] This finding appears all the more surprising since, for example in relation to rock anchors as described in the utility model DE 1 763 014 U, circular grooves, recesses, bulges or the like are known to promote good adhesion of the rock anchor in a rock, and therefore not to enable a particularly loose fit in the rock.

[0009] The structured section can be configured for rubbing and / or sawing to further enhance its clearance-creating effect in conjunction with the vibration. It can have a sawtooth structure, in particular one that faces radially outward, and / or a wave pattern, preferably flat and particularly preferably facing radially outward.

[0010] Preferably, the structured section does not extend to the tool tip, in particular not to the at least one wedge surface of the tool tip. The structured section can be located exclusively on the tool shank.

[0011] The chisel tool can be designed for use with a hand-held power tool designed as a chisel hammer machine and / or a hammer drill machine.

[0012] In one class of embodiments, the structured portion includes a plurality of ribs.

[0013] The at least one rib may have an outer edge. The outer edge of the rib can be particularly easily configured for grinding and / or sawing. The outer edge may be sharpened and / or hardened.

[0014] The ribs may be arranged regularly throughout the structured section.

[0015] For example, they can be arranged along rings that are offset parallel to each other.

[0016] The at least one rib may have a helical structure and / or be formed as a helical structure and / or arranged in a helical structure. Preferably, all ribs may be formed and / or arranged in this manner.

[0017] The at least one rib can protrude locally from the remaining tool shank by between 0.3 mm and 3 mm, particularly preferably 1 mm, to achieve a sufficient grinding and / or sawing action. In other words, the rib height can be 0.3 mm to 3 mm, particularly preferably 1 mm.

[0018] In the longitudinal direction, adjacent ribs can be spaced apart by between 0.2 cm and 1 cm, preferably 0.4 cm. Generally, the spacing can be selected such that chisel dust produced by the operation of the chisel tool either cannot pass between adjacent ribs and / or is not compacted between the adjacent ribs during operation of the chisel tool.

[0019] The dimensions, in particular the rib height and / or the distance between adjacent ribs, can be selected depending on the rock to be chiselled and / or depending on the chisel dust produced during chiselling.

[0020] The removal of chisel dust can be improved if the tool shank has at least one channel extending longitudinally or at least substantially longitudinally of the tool shank in the region of the structured section, particularly in the region of the ribs. Preferably, two, three, or four and / or more channels can be formed, evenly distributed over the circumference of the tool shank, particularly the structured section. The channels can be channel-shaped. It is also conceivable for the channels to be configured as flushing channels.

[0021] The removal of chisel dust can be further optimized if the at least one channel, preferably all channels, extend longitudinally across the entire structured section. In particular, the at least one channel can be configured to extend through the structured section.

[0022] The tool shank may have a smaller maximum diameter outside the structured section than within the structured section. In particular, the tool shank may have a smaller maximum diameter on the side of the structured section opposite the tool tip compared to the structured section. Thus, this remaining part of the tool shank can move largely frictionlessly within the chisel hole created by the chisel tool, further reducing the risk of the chisel tool jamming.

[0023] A chisel tool in which at least the structured section is produced by a forming process and / or non-cutting can be offered particularly cost-effectively. This takes advantage of the fact that the outer edge of the ribs can be relatively blunt to achieve the required friction and / or sawing action.

[0024] Alternatively or additionally, it is also conceivable that the structured section is manufactured, at least in part, by a machining process, such as milling. The chisel tool can then be flexibly adapted to individual requirements within wide limits, for example, with regard to the material to be machined.

[0025] The chisel tool may have a shank designed for tool-free tool changing. In particular, it may have a shank designed for a tool-free tool changing system, which is commonly referred to, for example, as "SDS," in particular "SDS-plus" or "SDS-max," or as "TE-S" or "TE-H28."

[0026] The invention also encompasses the use of a chisel tool according to the invention for chiseling in rock, preferably one containing cement. This is particularly advantageous when the chisel tool is used in conjunction with a high-performance handheld power tool, for example, a portable high-performance chiseling machine. Especially when chiseling at high extraction rates, there has previously been an increased risk of the chisel tool becoming stuck in the chisel hole it creates.

[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.

[0028] An embodiment of the invention is shown in the schematic drawing and explained in more detail in the following description.

[0029] They show: Fig. 1 a chisel tool not according to the invention in a side view and Fig. 2 a chisel tool according to the invention in a side view.

[0030] 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.

[0031] Fig. 1 shows a chisel tool 10 with a tool tip 12 and a tool shank 14.

[0032] The chisel tool 10 is designed as a pointed chisel. For this purpose, the tool tip 12 has a conical wedge surface 16 through which a pointed end of the tool tip 12 is formed.

[0033] The tool shank 14 has a structured section adjacent to the tool tip 12 18 on.

[0034] At its end opposite the tool tip 12, the tool shank 14 has a shank end, in particular a Y-shaped one, corresponding to the "SDS max" standard. 20 It is also conceivable that the tool shank 14 alternatively has a C-shaped insertion end 20.

[0035] The structured section 18 has a plurality of regularly arranged ribs 22 of which, for reasons of clarity, three ribs 22 are provided with a reference symbol as an example and as a representative of the remaining ribs.

[0036] The structured section 18 has a total of four channels running in a longitudinal direction L of the chisel tool 10 24 of which in the illustration according to Fig. 1only two channels 24 are visible. The channels 24 are evenly distributed over the circumference of the tool shank 14 and in particular the structured section 18.

[0037] The ribs 22 have a cuboid shape. They are arranged transversely to the longitudinal direction L. They have a rib height hr of 1 mm. Their rib width br is also 1 mm. Adjacent ribs 22 have a distance ar of 4 mm.

[0038] The structured section 18 has a largest diameter there of 21 mm, especially 21.2 mm. The largest diameter dw of the remaining tool shank 14 is 18 mm.

[0039] The chisel tool 10 has a total length Im of 36 cm, in particular 360 mm. The ribs 22 of the structured section 18 are located at a distance Ir of 22 cm from the insertion end 20 of the tool shank 14.

[0040] Fig. 2 shows another chisel tool 10. This chisel tool 10 corresponds to the previous one in terms of Fig. 1 described chisel tool 10, unless otherwise stated below. In particular, this chisel tool 10 and its elements may also have the same dimensions and / or dimensions as the previously described chisel tool 10 and its elements.

[0041] However, this embodiment of the chisel tool 10 differs from the previously described embodiment in the design of its ribs 22 of its structured section 18.

[0042] In particular, these ribs 22 have a prismatic shape. They are arranged at an angle alpha of 60° relative to the longitudinal direction L. They are arranged, in particular, in a helical configuration over the circumference of the structured section 18. The helical configuration of the ribs 22 is interrupted by the channels 24, which are again evenly distributed over the circumference. List of reference symbols

[0043] 10Chisel tool 12Tool tip 14Tool shank 16Wedge surface 18Structured section 20Slot end 22Rib 24Channel LLongitudinal direction alphaInclination angle arDistance brRib width daDiameter dwDiameter hrRib height ImTotal length IrDistance

Claims

1. Chiseling tool (10), in particular for a hand-held machine tool, comprising a tool tip (12), having at least one wedge surface (16), and a tool shank (14), wherein the chiseling tool (10) is designed as a pointed chisel, wherein the tool shank (14) on the circumference has a structured portion (18), wherein the structured portion (18) has at least one rib (22), and characterized in that the at least rib (22) extends so as to be inclined by an inclination angle (alpha) of at least 45°, preferably 60°, in relation to a longitudinal direction (L) of the chiseling tool (10).

2. Chiseling tool according to one of the preceding claims, characterized in that the at least one rib (22) has a helical structure and / or is designed as a helical structure and / or is disposed in a helical structure.

3. Chiseling tool according to one of the preceding claims, characterized that the at least one rib (22) protrudes locally from the remaining part of the tool shank (14) by between 0.3 mm and 3 mm, particularly preferably by 1 mm.

4. Chiseling tool according to one of the preceding claims, characterized in that respective ribs (22) that are adjacent in the longitudinal direction (L) have a mutual spacing (ar) between 0.2 cm and 1 cm, preferably 0.4 cm.

5. Chiseling tool according to one of the preceding claims, characterized in that the tool shank (14) in the region of the structured portion (18), in particular in the region of the at least one rib (22), has at least one channel (24) which extends in the longitudinal direction (L) or at least substantially in the longitudinal direction (L) of the tool shank (14).

6. Chiseling tool according to the preceding claim, characterized in that the at least one channel (24) along the longitudinal direction (L) extends over the entire structured portion (18).

7. Chiseling tool according to one of the preceding claims, characterized in that the tool shank (14) outside the structured portion (18) has a smaller maximum diameter (dw) than in the region of the structured portion (18).

8. Chiseling tool according to one of the preceding claims, characterized in that at least the structured portion (18) is produced by a forming process and / or in a non-subtractive manner.

9. Use of a chiseling tool (10) according to one of the preceding claims, for chiseling in rock material that preferably contains cement.