Clamping bolt with integrated RFID transponder

Abstract

An attachment for a clamping bolt has a base body and an opening which passes through the base body. Around the through-going opening runs a contact face which is positioned orthogonally on the longitudinal axis of the through-going opening and which is configured to make contact with the clamping bolt. A receptacle region runs around the through-going opening in the basic body, between the through-going opening and the contact face. An RFID transponder is arranged in the receptacle region. The clamping bolt has a circular-cylinder-shaped clamping region. A first boundary region and a second boundary region bound the clamping region along the longitudinal axis of the clamping bolt Each boundary region has a larger external diameter than the clamping region. The attachment is arranged on the first boundary region. A through-going opening runs along the longitudinal axis of the clamping bolt.

Claims

1. A clamping bolt (5) having a circular-cylindrically shaped clamping region (51), a first boundary region (52) and a second boundary region (53) which border the clamping region (51) along the longitudinal axis of the clamping bolt (5), wherein each boundary region (52, 53) has a greater external diameter than the clamping region (51), and a through opening (55) running along a longitudinal axis of the clamping bolt (5), wherein an attachment (3) is arranged on the first boundary region (52), said attachment (3) having a base body (31), an opening (32) passing through the base body, a contact surface (33) that runs around the through opening, said contact surface (33) standing orthogonally on the longitudinal axis (L) of the through opening (32), and that is adapted to contact the clamping bolt (5), a receptacle region (34) running around the through opening (32) between the through opening (32) and the contact surface (33) in the base body, and a RFID transponder (4) arranged in the receptacle region (34).

2. The clamping bolt (5) according to claim 1, wherein the RFID transponder (4) has an antenna (41) that is arranged in the receptacle region (34) around the through opening (32).

3. The clamping bolt (5) according to claim 2, wherein the RFID transponder (4) has a circuit board (42) connected to the antenna (41), on which a data memory (43) is arranged, wherein the circuit board (42) is arranged in the receptacle region (34) substantially in parallel to the through opening (32).

4. The clamping bolt (5) according to claim 1, wherein the base body (31) comprises a plastic.

5. The clamping bolt (5) according to claim 1, wherein the receptacle region (34) is filled with a filling material.

6. The clamping bolt (5) according to claim 5, wherein the filling material is arranged in the receptacle region (34) in such a way that it forms a common plane with the contact surface (33).

7. The clamping bolt (5) according to claim 1, wherein the attachment (3) has a larger cross-sectional surface on its end facing towards the contact surface (33) than on its end facing away from the contact surface (33).

8. The clamping bolt (5) according to claim 1, wherein the through opening (32) of the attachment (3) and the through opening (55) of the clamping bolt (5) have the same cross-section.

9. The clamping bolt (5) according to claim 1, wherein the resonance frequency of the RFID transponder (4) is adapted to the material of which the first boundary region (52) comprises.

10. The clamping bolt (5) according to claim 1, wherein the contact surface (33) of the attachment (3) is adhered to the first boundary region (52) of the clamping bolt (5).

11. The clamping bolt (5) according to claim 1, wherein the base body has recesses (35a-d) that extend through the contact surface (33).

12. The clamping bolt (5) according to claim 11, wherein the first boundary region (52) of the clamping bolt (5) has several engaging elements (56a-d), wherein each engaging element (56a-d) engages in one recess (35a-d) of the attachment (3).

13. The clamping bolt (5) according to claim 1, wherein the first boundary region (52), together with the attachment (3), forms a conical shape.

Description

SHORT DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows an isometric depiction of a zero-point clamping module according to prior art.

(2) FIG. 2 shows an isometric depiction of an attachment according to an exemplary embodiment of the invention.

(3) FIG. 3 shows top view of the attachment according to FIG. 2.

(4) FIG. 4 shows a sectional depiction of the attachment according to FIG. 3 along the line IV-IV.

(5) FIG. 5 shows an isometric depiction of the attachment according to FIG. 5 from its rear side by omitting the filling material contained in its receptacle region.

(6) FIG. 6 shows an isometric depiction of a clamping bolt according to an exemplary embodiment of the invention.

(7) FIG. 7 shows a section of a clamping bolt according to an exemplary embodiment of the invention in an isometric depiction by omitting the attachment.

EXEMPLARY EMBODIMENTS OF THE INVENTION

(8) A conventional zero-point clamping system, as is known from DE 10 2013 201 994 A1, is depicted in FIG. 1. It has a clamping receiver 1, a circular-cylindrically shaped insertion opening 11 being found in the base housing thereof. Locking elements 12 are provided in the clamping receiver 1, said locking elements 12 being formed as sliders. They are able to be shifted from a radially external unlocking position into a radially internal locking position. When shifting the locking elements 12 into the radially internal locking position, a clamping bolt 2 inserted into the insertion opening 11 is firstly retracted into the insertion opening 11 and then locked in place there.

(9) The clamping bolt 2 has a circular-cylindrically shaped clamping region 21. This is bordered by a conical first boundary region 22 and a conical second boundary region 23. When the clamping bolt 2 is inserted into the insertion opening 11 and the locking elements 12 are in their locking position, then the locking elements 12 abut on the locking region 21. The clamping bolt 2 has a seat 24 for abutting on a carrier component (not depicted). In order to connect the carrier component, which is a clamping plate, for example, or even a workpiece to be processed, fixedly to the clamping bolt, the clamping bolt has a circular-cylindrically shape through opening 25 along its longitudinal axis in which a screw can be inserted. The clamping bolt 2 consists of hardened steel.

(10) An exemplary embodiment of an attachment 3 for a clamping bolt according to the invention is depicted in FIGS. 2 to 5. This has a base body 31 that consists of the plastic PA6 GF30. The base body is substantially conical. Its maximum diameter presently increases from 18 mm on its front side to 21 mm on its rear side. A circular-cylindrically shaped opening 32 with a diameter of 14.5 mm passes through the base body 31. It runs along the longitudinal axis L of the attachment 3. In the rear view of the attachment 3 shown in FIG. 5, it is depicted that this has a contact surface 33 on its rear side. Between the contact surface 33 and the through opening 32, a receptacle region 34 runs around the through opening 32. This extends along the longitudinal axis L of the attachment 3 over its entire length. A RFID transponder 4 is arranged in the receptacle region 34. This has an antenna 41 that is wrapped around the through opening 32 in several coils. It ends on a circuit board 42 on which a permanent data memory 43 is arranged. The data memory 43 is a data memory with up to 128 kB of memory capacity according to ISO15693. The circuit board stands upright in the receptacle region and is thus arranged substantially in parallel to the through opening 32. The receptacle region 34 is filled with a two-component resin based on polyurethane as the filling material in such a way that this, together with the contact surface 33, forms a common surface. Four recesses 35a-35d are formed in the contact surface 33. These are each radially open towards the external wall of the attachment 3.

(11) An exemplary embodiment of a clamping bolt 5 according to the invention is depicted in FIG. 6. This has a circular-cylindrically shaped clamping region 51 and two boundary regions 52, 53. The first boundary region 52 has the shape of a truncated cone. The second boundary region 53 is conical. A seat 54 for contacting a carrier component is found on the end of the clamping bolt facing away from the first boundary region 52. The attachment 3, according to the exemplary embodiment of the invention described above, is adhered to the first boundary region 52 by means of an epoxy resin. The first boundary region has four engaging elements 56a-d protruding in the longitudinal direction of the clamping bolt, said engaging elements engaging in the recesses 35a-d of the attachment 3 and thus absorbing the forces acting laterally on the attachment 3. The clamping bolt 5 has a through opening 55 that, just like the through opening 32 of the attachment 3, has a circular cross-section with a diameter of 14.5 mm. The clamping bolt according to the present exemplary embodiment of the invention can be introduced into the conventional clamping receiver 1 instead of the conventional clamping bolt 2. Thus, mechanical stresses caused by the locking elements 12 only act on the clamping region 51 and on the first boundary region 52 of the clamping bolt, but not on the attachment 3.

(12) The clamping bolt 5 can be identified independently of its position by means of the RFID transponder 4. In order to minimise disturbing influences of the first boundary region 52 that also, like the clamping region 51, the second boundary region 53 and the seat 54, consists of hardened steel, on the RFID transponder 4, the resonance frequency thereof is adapted to the hardened steel. To do so, a suitable capacitor (not shown) is provided on the circuit board 42.