Drilling tool with a drill head that has a central pyramid

Abstract

In a drilling tool, in particular a rock drilling tool, with a drill head (130) having a central pyramid (250) with in particular at least three cutting edges (251, 252, 253, 254), and having at least two cutting elements (220, 240, 210, 230) with cutting edges (221, 241, 211, 231), at least between two cutting elements (220, 240, 210, 230) adjacent in the circumferential direction (198) of the drill head (130) a cutting edge (251, 252, 253, 254) of the central pyramid (250) is arranged.

Description

State of the art

[0001] The present invention relates to a drilling tool, in particular a rock drilling tool, with a drill head having a central pyramid with in particular at least three cutting edges, and having at least two cutting elements with cutting edges.

[0002] A drilling tool of this type, designed as a rock drilling tool, is known from the prior art. The drilling tool has a drill head with cutting elements having cutting edges. Furthermore, the drill head has a central pyramid with cutting edges. The cutting edges of the central pyramid are radially congruent with the cutting edges of the cutting elements and thus form common cutting edges with them. Disclosure of the invention

[0003] The invention relates to a drilling tool, in particular a rock drilling tool, with a drill head having a central pyramid with, in particular, at least three cutting edges, and having at least two cutting elements with cutting edges. A cutting edge of the central pyramid is arranged at least between two cutting elements adjacent in the circumferential direction of the drill head.

[0004] The invention thus enables the provision of a drilling tool in which, by means of the offset arrangement of a cutting edge of the central pyramid relative to the two adjacent cutting edges of the cutting elements, an increase in the efficiency of a respective drilling speed can be achieved simply and reliably, since the material to be machined is processed at several points simultaneously.

[0005] According to one embodiment, the central pyramid has at least four cutting edges, and at least four cutting elements are provided, which are designed as at least two diametrically opposed main cutting elements, each with a main cutting edge, and at least two diametrically opposed secondary cutting elements, each with a secondary cutting edge, wherein a secondary cutting element is arranged between each of two main cutting elements adjacent in the circumferential direction of the drill head, and wherein a cutting edge of the at least four cutting edges of the central pyramid is arranged between each main cutting element of the at least two diametrically opposed main cutting elements and each secondary cutting element of the at least two diametrically opposed secondary cutting elements adjacent in the circumferential direction of the drill head.

[0006] This makes it easy to provide a suitable design for the drill head.

[0007] Preferably, the at least four cutting edges of the central pyramid are arranged at corresponding angles to each other in the circumferential direction of the drill head.

[0008] This allows for a suitable arrangement of the cutting edges in a simple way.

[0009] The associated angles are preferably of the same size and have a pitch of 90°.

[0010] This makes it easy and straightforward to achieve a symmetrical arrangement of the cutting edges of the central pyramid.

[0011] Each cutting edge of the at least four cutting edges of the central pyramid is preferably arranged at a predetermined angle to a main cutting edge of the at least two diametrically opposed main cutting elements adjacent in the circumferential direction of the drill head.

[0012] This allows for a simple and application-specific arrangement of the cutting edges of the central pyramid relative to the main cutting edges.

[0013] Preferably, the specified angle is 30°, 45° or 60°.

[0014] This allows the drilling tool to be easily matched to a specific impact pattern assigned to a corresponding hand-held power tool.

[0015] Preferably, the main cutting edges of the at least two diametrically opposed main cutting elements, the secondary cutting edges of the at least two diametrically opposed secondary cutting elements and / or the at least four cutting edges of the central pyramid are aligned in the radial direction of the drill head.

[0016] Thus, a suitable arrangement of the cutting edges of the central pyramid relative to the main cutting edges and secondary cutting edges can be formed for efficient drilling operation.

[0017] Preferably, the main cutting edges of the at least two diametrically opposed main cutting elements, the secondary cutting edges of the at least two diametrically opposed secondary cutting elements and / or the at least four cutting edges of the central pyramid are formed at least partially as straight, curved, convexly curved and / or concavely curved.

[0018] Thus, a suitable formation of the cutting edges of the central pyramid, the main cutting edges and / or the secondary cutting edges can be easily achieved.

[0019] According to one embodiment, at least one secondary cutting edge of the at least two diametrically opposed secondary cutting elements and / or at least one main cutting edge of the at least two diametrically opposed main cutting elements has a first height on an outer circumference of the drill head, wherein the first height is reduced to a second height via a recess in an area facing the central pyramid.

[0020] This allows for an increase in drilling speed, enabling at least one secondary cutting edge and / or main cutting edge in the radially outer area to penetrate the material being machined faster and deeper. Furthermore, a higher drilling speed can result in a greater overall drilling path for the drill bit.

[0021] Preferably, the drilling tool is provided with a drill shank which has a fastening section for detachable attachment in a tool holder of a hand-held power tool and a spiral conveying section for removing drilling dust generated during a machining operation, wherein the drill shank is connected to the drill head via a material-bonded connection.

[0022] This allows for a stable and robust connection between the drill head and the drill shaft.

[0023] Preferably, the fastening section is designed as an SDS shank.

[0024] This allows for the provision of a common and widely used fastening section. Brief description of the drawings

[0025] The invention is explained in more detail in the following description using exemplary embodiments illustrated in the drawings. They show: Fig. 1 a top view of a drilling tool with a drill head according to the invention, Fig. 2 a top view of the drill head of Fig. 1 with a central pyramid, Fig. 3 a perspective view of the drill head of Fig. 1 and Fig. 2, Fig. 4 a top view of the drill head of Fig. 1 to Fig. 3 with an initial alignment of the central pyramid, Fig. 5 a top view of the drill head of Fig. 1 to Fig. 4 with a further alignment of the central pyramid, Fig. 6 a top view of the drill head of Fig. 1 to Fig. 5 with an alternative orientation of the central pyramid, Fig. 7 a side view of the drill head of Fig. 1 to Fig. 6, Fig. 8 a side view of the drill head of Fig. 1 to Fig. 7, where the drill head is in comparison to Fig. 7 is arranged rotated in the circumferential direction, and Fig. 9 a perspective view of the drill head of Fig. 1 to Fig. 8 during a drilling operation in a reinforcement element. Description of the exemplary implementations

[0026] In the figures, elements with the same or comparable function are provided with identical reference symbols and are described in detail only once.

[0027] Fig. Figure 1 shows a substantially cylindrical drilling tool 100. Generally, the drilling tool 100 is designed for mounting in a holder of a machine tool, preferably a hand-held power tool, for drilling and / or impact machining. The drilling tool 100 can, for example, be designed as a rock drilling tool for machining mineral materials such as rock, concrete, and / or reinforced concrete. The drilling tool 100 according to the invention can also be designed for machining other materials that would be suitable to a person skilled in the art, such as wood, plastic, or a composite material. Preferably, the drilling tool 100 is designed to perform a rotary and / or translational working movement on a workpiece to be machined.

[0028] The drilling tool 100 extends, for illustrative purposes, in the axial direction along a tool axis 199. The tool axis 199 forms a rotational axis of the drilling tool 100 and is subsequently referred to as the "rotational axis 199". Preferably, the drilling tool 100 has at least one drill head 130 and a drill shank 115 connected to the drill head 130, which are preferably formed in one piece or at least materially bonded together. The drill shank 115 preferably has a fastening section 120 for detachably fastening the drilling tool 100 in a tool holder of a hand-held power tool, as well as a spiral conveying section 110 for removing drilling dust generated during a machining operation. Alternatively, the drill shank 115 can be designed as a dust extraction drill shank, or the drilling tool 100 can be designed as a dust extraction drill, e.g., with a dust extraction opening in the drill shank 115.

[0029] The conveying section 110 preferably has four conveying grooves 117 winding spirally around the axis of rotation 199, which are designed to transport the resulting drill cuttings along the axial direction of the axis of rotation 199 in a direction away from the drill head 130, e.g., from a corresponding borehole, during a machining operation. Alternatively or additionally, fewer than four, such as one, two, or three conveying grooves 117, or more than four, such as five, six, or more conveying grooves 117, can be provided.

[0030] The spiral conveying grooves 117 are shown to be separated by webs 118 which wind spirally around the axis of rotation 199 in the circumferential direction 198. The webs 118 preferably run parallel to the conveying grooves 117 and are accordingly spirally shaped.

[0031] The fastening section 120 is shown for illustrative purposes on a side of the conveying section 110 facing away from the drill head 130. Preferably, the fastening section 120 has several radial recesses designed to enable a positive-locking and / or force-locking connection of the drilling tool 100, in particular the fastening section 120 of the drilling tool 100, to a hand-held power tool.

[0032] According to one embodiment, the fastening section 120 of the drill shank 115 is designed as an SDS shank. The fastening section 120 can be identical to conventional and already available fastening sections, such as SDS, SDS-max, or SDS-plus fastening sections. Such SDS fastening sections are sufficiently well known to those skilled in the art, so a detailed description is omitted.

[0033] Preferably, a base side 131 of the drill head 130 faces an axial end 111 of the drill shaft 115, in particular of the conveying section 110.

[0034] According to one embodiment, the drill shank 115 is connected to the drill head 130 via a metallurgical bond, preferably forming it integrally. The drill shank 115 is metallurgically bonded to the drill head 130, particularly with the aid of an filler material or without the aid of an filler material. An auxiliary material can be used to connect the drill head 130 to the drill shank 115, for example, by means of a weld and / or a brazed joint. This auxiliary material can be, for example, nickel, copper, cobalt, manganese, and / or tin. According to one embodiment, the drill head 130 comprises carbide to withstand the highest wear loads. The drill head 130 is particularly designed as a solid carbide head and limits the axial extension of the drill shank 115 in the axial direction of the axis of rotation 199. The drill shank 115 can be made of steel.

[0035] Furthermore, the drill head 130 preferably comprises several cutting elements designed for removing, cutting, scraping, and / or crushing a workpiece to be machined. Depending on the embodiment of the drill head 130, the cutting elements can be divided into main cutting elements (220, 240 in Fig. 2) and / or secondary cutting elements (210, 230 in Fig. 2) be subdivided.

[0036] Fig. Figure 2 shows the drill head 130 of the drill tool 100 from Fig. 1. The drill head 130 has at least two, preferably three, and for illustrative purposes four cutting elements 210, 220, 230, 240 with associated cutting edges 211, 221, 231, 241. Furthermore, the drill head 130 has a central pyramid 250 with preferably at least three and for illustrative purposes four cutting edges 251, 252, 253, 254. At least between two cutting elements 220, 240, 210, 230 adjacent in the circumferential direction 198 of the drill head 130, a cutting edge 251, 252, 253, 254 of the central pyramid 250 is arranged. Preferably, a cutting edge 251, 252, 253, 254 of the central pyramid 250 is arranged between two circumferentially adjacent cutting edges 211, 221, 231, 241.

[0037] It should be noted that the drill head 130 may also have more than four cutting elements 210, 220, 230, 240 and / or the central pyramid 250 may also have more than four cutting edges 251, 252, 253, 254. The number of cutting elements 210, 220, 230, 240 may differ from the number of cutting edges 251, 252, 253, 254 of the pyramid 250.

[0038] Alternatively, the cutting elements 210, 220, 230, 240 and / or the central pyramid 250 can have a different number of cutting edges 211, 221, 231, 241 or 251, 252, 253, 254. For example, a cutting element 210, 220, 230, 240 can also have two cutting edges.

[0039] According to one embodiment, two diametrically opposed cutting elements 220, 240 are designed as main cutting elements and are hereinafter referred to as "main cutting elements 220, 240", and the associated cutting edges 221, 241 are hereinafter referred to as "main cutting edges 221, 241". Furthermore, two diametrically opposed cutting elements 210, 230 are designed as secondary cutting elements and are hereinafter referred to as "secondary cutting elements 210, 230", and the associated cutting edges 211, 231 are hereinafter referred to as "secondary cutting edges 211, 231". Preferably, a secondary cutting element 210, 230 is arranged between each pair of main cutting elements 220, 240 adjacent in the circumferential direction 198 of the drill head 130.Preferably, a cutting edge 251, 252, 253, 254 of the central pyramid 250 is arranged between a main cutting element 220, 240 and a secondary cutting element 210, 230 adjacent to the main cutting element 220, 240 in the circumferential direction 198 of the drill head 130. For illustrative purposes, the cutting edge 251 is arranged in the circumferential direction 198 between the main cutting edge 241 and the secondary cutting edge 211, the cutting edge 252 is arranged in the circumferential direction 198 between the secondary cutting edge 211 and the main cutting edge 221, the cutting edge 253 is arranged in the circumferential direction 198 between the main cutting edge 221 and the secondary cutting edge 231, and the cutting edge 254 is arranged in the circumferential direction 198 between the secondary cutting edge 231 and the main cutting edge 241.

[0040] Preferably, the cutting edges 211, 221, 231, 241 and / or the cutting edges 251, 252, 253, 254 of the central pyramid 250 are aligned in the radial direction 299 of the drill head 130. In particular, the main cutting edges 221, 241 of the at least two diametrically opposed main cutting elements 220, 240, the secondary cutting edges 211, 231 of the at least two diametrically opposed secondary cutting elements 210, 230 and / or the at least four cutting edges 251, 252, 253, 254 of the central pyramid 250 are aligned in the radial direction 299 of the drill head 130.

[0041] According to one embodiment, at least one cutting edge 251, 252, 253, 254 of the central pyramid 250 can be concave and / or convexly curved. Furthermore, at least one pyramidal face of the central pyramid 250 can be concave and / or convexly curved.

[0042] Preferably, the main cutting edges 221, 241 of the at least two diametrically opposed main cutting elements 220, 240, the secondary cutting edges 211, 231 of the at least two diametrically opposed secondary cutting elements 210, 230, and / or the at least four cutting edges 251, 252, 253, 254 of the central pyramid 250 are formed, at least partially, as straight, curved, convexly curved, and / or concavely curved. A cutting edge 211, 221, 231, 241 or 251, 252, 253, 254 can, by way of example, have a straight section that transitions into a convexly curved section.

[0043] Fig. Figure 3 shows the drill head 130 from Fig. 1 and Fig. 2 with the main cutting elements 220, 240 and the secondary cutting elements 210, 230, as well as the central pyramid 250 of Fig. 2. According to one embodiment, at least one of the main cutting edges 221, 241 of the at least two diametrically opposed main cutting elements 220, 240 and / or at least one of the secondary cutting edges 211, 231 of the at least two diametrically opposed secondary cutting elements 210, 230 has a chamfer 321, 331 and / or a radius or a rounding at its respective free end 322, 332. Preferably, all main cutting edges 221, 241 and / or all secondary cutting edges 211, 231 each have a chamfer 321, 331 and / or a radius. Alternatively, at least one cutting edge 251, 252, 253, 254 of the central pyramid 250 can have a chamfer and / or a radius.

[0044] Fig. Figure 4 shows the drill head 130 from Fig. 1 to Fig. 3 with the main cutting elements 220, 240 and the secondary cutting elements 210, 230, as well as the central pyramid 250 of Fig. 2 and Fig. 3. Preferably, the cutting edges 251, 252, 253, 254 of the central pyramid 250 are arranged at corresponding angles 411, 412, 413, 414 to each other in the circumferential direction 198 of the drill head 130. According to one embodiment, the corresponding angles 411, 412, 413, 414 are equal. Preferably, the corresponding angles 411, 412, 413, 414 are 90°. Alternatively, the corresponding angles 411, 412, 413, 414 can also be different. Furthermore, alternatively, two opposing angles 411, 413, 412, 414 can be the same, with, for example, two angles being 80° and two angles being 100°.

[0045] According to one embodiment, the four illustrative cutting edges 251, 252, 253, 254 of the central pyramid 250 are at a predetermined angle 401 (501 in Fig. 5; Fig. 601 in Fig. 6) arranged to a main cutting edge 221, 241 of the main cutting elements 220, 240 adjacent in the circumferential direction 198 of the drill head 130. The specified angle 401 between the cutting edge 252 and the main cutting edge 221 is shown by way of example and preferably has a value of 30°. Alternatively, the specified angle 401 can also be arranged between a cutting edge 251, 252, 253, 254 of the central pyramid 250 and a secondary cutting edge 211, 231 of the secondary cutting elements 210, 230 adjacent in the circumferential direction 198 of the drill head 130.

[0046] Fig. Figure 5 shows the drill head 130 from Fig. 1 to Fig. 4, wherein the central pyramid 250 is arranged at a predetermined angle 501 to the main cutting elements 220, 240 and / or the secondary cutting elements 210, 230. The predetermined angle 501 between the cutting edge 252 of the central pyramid 250 and the main cutting edge 221 of the main cutting element 220 is shown as an example. Preferably, the angle 501 is compared to Fig. 4 larger and preferably has a 45° angle.

[0047] Fig. Figure 6 shows the drill head 130 from Fig. 1 to Fig. 5, in which a predetermined angle 601 is shown by way of example between the cutting edge 252 and the main cutting edge 221. Preferably, the angle 601 is 60°. It is noted that the angles 401 in Fig. 4, Fig. 501 in Fig. 5, Fig. 601 in Fig. 6 can also have any other angle values.

[0048] Fig. Figure 7 shows the drill head 130 from Fig. 1 to Fig. Figure 6 shows the base 131 and the main cutting elements 220, 240, and the secondary cutting element 230 to illustrate exemplary heights of the main and secondary cutting elements of the drill head 130. For illustrative purposes, the main cutting elements 220, 240 have associated heights 712, 711, and the secondary cutting element 230 has an associated height 713. Here, the heights 711, 712, 713 are formed between the base 131 of the drill head 130 and the associated cutting edges 221, 241, 231 of the main cutting elements 220, 240, and the secondary cutting element 230, respectively. For illustrative purposes, a height 711 is formed between the base side 131 and the main cutting edge 241, a height 712 is formed between the base side 131 and the main cutting edge 221 and a height 713 is formed between the base side 131 and the secondary cutting edge 231.

[0049] According to one embodiment, at least one main cutting element and / or at least one secondary cutting element has a constant height. For illustrative purposes, the heights 712, 711 of the main cutting elements 220, 240 are constant. Furthermore, the heights can be identical within predefined manufacturing tolerances. For example, the heights 711, 712 are identical at least within predefined manufacturing tolerances, as indicated by a height line 710. The line 710 is arranged parallel to the base 131 for illustrative purposes. Furthermore, the heights 711, 712, 713 preferably form a maximum height. In addition, the main cutting elements 220, 240 and / or the secondary cutting elements 230 (and 210 in Fig. 1 to Fig. 6) have a comparatively large cutting edge length 721 oriented in a radial direction 299.

[0050] Fig. Figure 8 shows the drill head 130 from Fig. 1 to Fig. 7, which in the circumferential direction 198 of Fig. 2 to Fig. 6 relative to Fig. 7 is arranged rotated by 90° so that the two secondary cutting elements 210, 230 are arranged to the right and left for illustrative purposes, and the main cutting element 220 is arranged in the center for illustrative purposes. The secondary cutting element 230 has a height of 713. Fig. 7 and the main cutting element 220 has a height of 712. Fig. 7. The secondary cutting element 210 has an illustrative height of 831. The heights 713, 831 are preferably formed on an outer circumference 802 of the drill head 130 on the secondary cutting elements 210, 230.

[0051] According to one embodiment, at least one secondary cutting edge 211, 231 and / or at least one main cutting edge 221 (and 241 in Fig. 7) on the outer circumference 802 of the drill head 130, a respective maximum height, wherein the maximum heights correspond to heights 831, 713, 712 (and 711 in Fig. 7) correspond.

[0052] These maximum heights are reduced, for illustrative purposes, at one of the areas facing the central pyramid 250, via a recess 820, to a reduced height 833. This preferably results in a cutting edge length 811 oriented radially 299. The cutting edge length 811 is shorter than the cutting edge length 721 of Fig. 7.

[0053] For illustrative purposes, the maximum heights assigned to the secondary cutting edges 211 and 231 are reduced to 713 and 831. However, it should be noted that the maximum heights 712 (and 711 in Fig. 7) the main cutting edges 221 (and 241 in Fig. 7) can be reduced via a recess 820. Alternatively, at least one secondary cutting edge 211, 231 and / or at least one main cutting edge 221 (and 241 in) is required. Fig. 7) over their entire cutting edge length 811 (and / or 721 in Fig. 7) curved. In this case, at least one secondary cutting edge 211, 231 and / or at least one main cutting edge 221 (and 241 in) can be formed. Fig. 7) be concave and / or convex curved.

[0054] Fig. Figure 9 shows the drill head 130 from Fig. 1 to Fig. 8 in an exemplary drilling process in a reinforcement element 910. For illustrative purposes, the central pyramid 250 has already drilled a recess 920 into the reinforcement element 910. Due to the twisted arrangement of the central pyramid 250 or the cutting edges 251, 252, 253, 254 assigned to the central pyramid 250, of which in Fig. 9 only the cutting edge 253 is visible, relative to the main cutting elements 220, 240 or secondary cutting elements 210, 230, these can move during the drilling process on the reinforcement element 910 or on the resulting bore via the cutting edges, here in Fig. 9 support the main cutting edges 221, 241. This prevents the drilling tool 100 from sagging. Fig. 1 and / or preventing entanglement in the reinforcement element 910.

Claims

[1] Drilling tool (100), in particular rock drilling tool, with a drill head (130) which has a central pyramid (250) with in particular at least three cutting edges (251, 252, 253, 254), and which has at least two cutting elements (220, 240, 210, 230) with cutting edges (221, 241, 211, 231), characterized by that a cutting edge (251, 252, 253, 254) of the central pyramid (250) is arranged at least between two cutting elements (220, 240, 210, 230) adjacent in the circumferential direction (198) of the drill head (130). [2] Drilling tool according to claim 1, characterized bythat the central pyramid (250) has at least four cutting edges (251, 252, 253, 254), and at least four cutting elements (220, 240, 210, 230) are provided, which are designed as at least two diametrically opposed main cutting elements (220, 240), each with a main cutting edge (221, 241) and at least two diametrically opposed secondary cutting elements (210, 230), each with a secondary cutting edge (211, 231), wherein between two main cutting elements (220, 240) adjacent in the circumferential direction (198) of the drill head (130) a secondary cutting element (210, 230) is arranged, and wherein between each main cutting element (220, 240) of the at least two diametrically opposed main cutting elements (220, 240) and each adjacent secondary cutting element (210, 230) of the at least two diametrically opposite secondary cutting elements (210, 230) in the circumferential direction (198) of the drill head (130) has a cutting edge (251, 252, 253,254) of the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250). [3] Drilling tool according to claim 2, characterized by that the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) are arranged in the circumferential direction (198) of the drill head (130) at associated angles (411, 412, 413, 414) to one another. [4] Drilling tool according to claim 3, characterized by that the associated angles (411, 412, 413, 414) are equal and 90°. [5] Drilling tool according to one of claims 2 to 4, characterized by that each cutting edge (252) of the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) is arranged at a predetermined angle (401, 501, 601) to a main cutting edge (221) of the at least two diametrically opposite main cutting elements (220, 240) which is adjacent in the circumferential direction (198) of the drill head (130). [6] Drilling tool according to claim 5, characterized by that the specified angle (401, 501, 601) is 30°, 45° or 60°. [7] Drilling tool according to one of claims 2 to 6, characterized by that the main cutting edges (221, 241) of the at least two diametrically opposed main cutting elements (220, 240), the secondary cutting edges (211, 231) of the at least two diametrically opposed secondary cutting elements (210, 230) and / or the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) are aligned in the radial direction (299) of the drill head (130). [8] Drilling tool according to one of claims 2 to 7, characterized bythat the main cutting edges (221, 241) of the at least two diametrically opposed main cutting elements (220, 240), the secondary cutting edges (211, 231) of the at least two diametrically opposed secondary cutting elements (210, 230) and / or the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) are at least partially straight, curved, convexly curved and / or concavely curved. [9] Drilling tool according to one of claims 2 to 8, characterized byin that at least one secondary cutting edge (211, 231) of the at least two diametrically opposed secondary cutting elements (210, 230) and / or at least one main cutting edge (221, 241) of the at least two diametrically opposed main cutting elements (220, 240) has a first height (713; 831) on an outer circumference (802) of the drill head (130), wherein the first height (713; 831) is reduced to a second height (833) via a recess (820) in a region facing the central pyramid (250). [10] Drilling tool according to one of the preceding claims, with a drill shank (115) which has a fastening section (120) for releasably fastening in a tool holder of a hand-held power tool and a spiral conveyor section (110) for removing drilling dust arising during a machining operation, wherein the drill shank (115) is connected to the drill head (130) via a material-to-material connection. [11] Drilling tool according to claim 10, characterized by that the fastening section (120) is designed as an SDS shaft.

Images