Device for drilling out a non-detachable mechanical connecting element, in particular a riveted connection

Abstract

Device for drilling out a non-detachable mechanical connecting element, in particular a riveted connection, wherein the device can be connected to a drill having a drill chuck, wherein the connection is made exclusively via the drill chuck of the drill, further comprising a rod-shaped housing (1) in which an output shaft (4) is mounted, which projects with a first end beyond a first end face (2) of the housing (1) and can be connected with this projecting end to the drill chuck, characterized in that the output shaft (4) is mounted via roller bearings (14) in a guide (11) which is mounted in the housing (1) so as to be longitudinally displaceable against the force of a spring (12).

Description

[0001] The invention relates to a device for drilling out a non-detachable mechanical connecting element, in particular a riveted connection, wherein the device can be connected to a drilling machine having a drill chuck.

[0002] Such a device is known. It is characterized in particular by its non-rotatable connection to the drill. However, this non-rotatable connection not only requires complex modification of the drill but also allows no flexibility in the selection of the drill. Furthermore, increased adaptation effort is required to provide an adapter suitable for the respective drill. The adapter, in turn, requires a considerable amount of installation space.

[0003] DE 600 05 891 T2 discloses a method and device for removing rivets, in which a rotating shaft is connected to a milling head. The shaft is mounted in a stationary housing complex via an axial ball bearing and three needle bearings.

[0004] Furthermore, reference is made to the documents US 5,318,390 A, US 2,375,112 A and US 2004 / 0 033 112 A1, the disclosure of which may be helpful in understanding the present invention.

[0005] It is therefore an object of the present invention to provide a device of the type mentioned at the outset which allows greater flexibility in the selection of the drilling machine, does not cause any adaptation problems and requires little installation space.

[0006] This object is achieved according to the invention in a device for drilling out a non-detachable mechanical connecting element, in particular a riveted connection, wherein the device can be connected to a drilling machine having a drill chuck, in that the connection is made exclusively via the drill chuck of the drilling machine.

[0007] Due to the inventive design, the device can be connected to any drill, making it device-independent. An additional adapter is also no longer necessary, and it requires only a small amount of space, thus providing improved accessibility in confined spaces. Although the device according to the invention, unlike the prior art device, is no longer connected to the drill in a rotationally fixed manner, torque can be easily absorbed by external support, e.g., by holding the device in place, by a lever attachable to the device, or by a knurl to increase friction.

[0008] The device is characterized by a rod-shaped housing in which an output shaft is mounted. A first end of the output shaft protrudes beyond a first end face of the housing and can be connected to the drill chuck via this protruding end. This allows for a secure grip on the device due to the rod-shaped design of the housing, and also ensures easy connection to the drill chuck of the drill due to the output shaft projecting beyond the housing.

[0009] The output shaft is mounted on roller bearings in a guide which is mounted in the housing so that it can move longitudinally against the force of a spring.

[0010] The subclaims contain advantageous developments and refinements of the invention.

[0011] The output shaft advantageously has a receptacle for a drill at its second end.

[0012] Furthermore, the housing preferably has a second end face opposite the first end face, which is provided with a bore for the passage of the drill.

[0013] The spring is preferably designed as a helical compression spring.

[0014] Furthermore, according to an advantageous further development, the drill is guided in a sleeve which is mounted in the housing so as to be longitudinally displaceable against the force of a spring.

[0015] The spring is preferably designed as a disc spring.

[0016] When the spring is relaxed, the sleeve preferably projects slightly beyond the second end face of the housing.

[0017] According to an advantageous embodiment, a first and a second receiving space are formed in the housing, which are separated from each other by a radially extending wall.

[0018] An opening is advantageously provided in the wall for the drill to pass through.

[0019] According to a preferred development, the first receiving space has a larger inner diameter than the second receiving space, wherein the first receiving space essentially serves to receive the output shaft, the guide and the helical compression spring, while the second receiving space essentially serves to receive the sleeve and the disc spring.

[0020] In order to ensure that the guide or bushing moves with as little friction as possible, according to an advantageous embodiment, a sliding bushing is arranged in each of the first receiving space and in the second receiving space, which sliding bushing surrounds the guide or the sleeve.

[0021] In the area of ​​the second end face, a retaining element is advantageously arranged near the opening for the drill. This preferably consists of two essentially diametrically opposed, tapered retaining lugs.

[0022] Further details, features, and advantages of the invention will become apparent from the following description with reference to the drawings. They show: Fig. 1 a perspective view of a device according to the invention, Fig. 2 the perspective view according to Fig. 1 in a longitudinal section, and Fig. 3 a longitudinal section through the device according to the invention.

[0023] The Fig. 1 and Fig. 2 shows a device according to the invention for drilling out a non-detachable mechanical fastener, in particular a riveted joint, in a perspective view and a longitudinal section. The device can be connected to a drill chuck of a drill (not shown).

[0024] A substantially rod-shaped housing 1 can be seen, which has a first end face 2 and a second end face 3. An output shaft 4, mounted in the housing 1, protrudes beyond the first end face 2 and can be clamped into the drill chuck.

[0025] The output shaft 4 is the only connection between the device and the drill, i.e., unlike the device according to the prior art described above, the device is not connected to the drill in a torque-resistant manner. To prevent the device from rotating during a rotational movement of the drill chuck, the device must be prevented from rotating by an external support. This can be achieved, for example, by holding the device by hand, by a lever attachable to the device, preferably its housing 1, or by a knurl to increase friction.

[0026] In the area of ​​the first end face 2, a cover 5 is attached to the housing 1. This cover extends in the longitudinal direction of the housing 1 and consists of a substantially rectangular plate. The cover 5 can be screwed to the housing 1.

[0027] In the area of ​​the second end face 3, the housing 1 tapers conically toward a bore 6, into which a retaining element projects slightly beyond the second end face 3. The retaining element consists of two essentially diametrically opposed, tapered retaining lugs 7. The retaining lugs 7 can, for example, be formed by commercially available diamond-shaped indexable inserts and can be screwed to the housing 1.

[0028] As can be seen in particular from the Fig. 2 and Fig. As can be seen in Figure 3, a first receiving space 8 and a second receiving space 9 are formed in the housing 1, which extend in the axial direction of the housing 1 and are separated from one another by a radially extending wall 10. The two receiving spaces 8 and 9 are open at their ends facing away from the wall 10. Furthermore, the first receiving space 8 has a larger inner diameter than the second receiving space 9.

[0029] A guide 11 is arranged in the first receiving space 8, which can be longitudinally displaced against the force of a spring 12, for example a helical compression spring, toward the bore 6 provided in the second end face 3 of the housing 1. A sliding bushing 13 is arranged between the guide 11 and the inner wall of the first receiving space 8, ensuring low-friction longitudinal displacement of the guide 11.

[0030] Within the guide 11, in the region of its upper and lower edges, rolling bearings 14 are arranged, which support the output shaft 4 so that it can rotate but cannot be displaced relative to the guide 11. The guide 11 itself is held in the first receiving space 8 in a rotationally secure manner. For this purpose, an anti-rotation device 15 is arranged beneath the cover 5. In the illustrated embodiment, this anti-rotation device is designed as a bolt that projects radially into the first receiving space 8 and engages in a longitudinal slot 16 arranged in the outer side of the guide 11. Thus, the guide 11 can move in the longitudinal direction of the housing 1 according to the length of the longitudinal slot 16, but cannot rotate.

[0031] The guide 11 itself is essentially pot-shaped and has a through-opening 17 in its base for the output shaft 4. At its end opposite the base, the guide 11 is provided with a retaining ring 18, which secures the roller bearings 14 and thereby ensures that the output shaft 4 can rotate relative to the guide 11 but cannot move in the axial direction.

[0032] At the end of the output shaft 4 projecting beyond the through-opening 17 toward the wall 10, a receptacle 19 for a drill 20 is provided. This receptacle 19, which is located within the spring 12 acting on the guide 11, has a grub screw 21 for fastening the drill 20, which mounts the drill 20 in a rotationally fixed manner, for example, by engaging a flattened surface portion 22 of the drill 20.

[0033] The drill 20 extends through an opening 23 in the wall 10 and projects into the second receiving space 9. In the second receiving space 9, the drill 20 is guided in a sleeve 24, which projects slightly outward beyond the second end face 3, is mounted for longitudinal displacement in the second receiving space 9, and is biased toward the bore 6 by a spring 25, which may be designed, for example, as a disc spring.

[0034] A sliding bushing 13 is also arranged between the sleeve 24 and the inner wall of the second receiving space 9, which ensures a low-friction longitudinal displacement of the sleeve 24.

[0035] The sleeve 24 itself is held in the second receiving space 9 so that it can be moved longitudinally but is secured against rotation. For this purpose, a threaded pin 26 is provided, which projects radially into the second receiving space 9 and engages in a longitudinal slot 27 arranged in the outer side of the sleeve 24. Thus, the sleeve 24 can move in the longitudinal direction of the housing 1 according to the length of the longitudinal slot 27, but cannot rotate.

[0036] In order to drill out a non-detachable mechanical fastener, in particular a riveted connection, with the device, the device is first clamped into the drill chuck with the end of the output shaft 4 projecting beyond the first end face 2. The device is then placed onto the fastener to be drilled out with the sleeve 24 projecting slightly beyond the second end face 3. By exerting pressure on the device in the direction of the fastener, the spring 25 is compressed and the sleeve 24 is pushed into the second receiving space 9. As a result, the second end face 3 comes into contact with the fastener to be drilled out, whereby the retaining lugs 7, which also project slightly beyond the second end face 3, penetrate into the fastener and prevent it from rotating.By switching on the drill, the output shaft 4 and the drill bit 20 can now be set in rotation. The device must be held firmly, for example, with one hand, to prevent it from rotating. If pressure is now applied toward the connecting element, the guide 11, together with the output shaft 4, moves against the force of the spring 12 toward the bore 6, allowing the drill bit 20 to emerge from the sleeve 24 and penetrate the connecting element to drill it out.

[0037] If, after drilling has been completed, no more pressure is exerted in the direction of the connecting element, the spring 12 presses the guide 11 on the one hand and the spring 25 presses the sleeve 24 into its Fig. 2 and Fig. 3, in which the sleeve 24 projects slightly beyond the second end face 3 and the drill 20 lies completely within the sleeve 24.

[0038] The foregoing description of the present invention is for illustrative purposes only and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention and its equivalents. List of reference symbols 1 housing 2 first front side 3 second front side 4 Output shaft 5 Cover 6 Hole 7 retaining lug 8 first recording room 9 second recording room 10 Wall 11 Guide 12 springs 13 sliding bushing 14 rolling bearings 15 Anti-twist device 16 Longitudinal slot 17 Passage opening 18 Retaining ring 19 recording 20 drills 21 Grub screw 22 flattened surface section 23 Opening 24 sleeve 25 spring 26 threaded pin 27 Longitudinal slot

Claims

[1] Device for drilling out a non-detachable mechanical connecting element, in particular a riveted connection, wherein the device can be connected to a drilling machine having a drill chuck, wherein the connection is made exclusively via the drill chuck of the drilling machine, further comprising a rod-shaped housing (1) in which an output shaft (4) is mounted, which projects with a first end beyond a first end face (2) of the housing (1) and can be connected with this projecting end to the drill chuck, characterized by , that the output shaft (4) is mounted via roller bearings (14) in a guide (11) which is mounted in the housing (1) so as to be longitudinally displaceable against the force of a spring (12). [2] Device according to claim 1, characterized by that the output shaft (4) has a receptacle (19) for a drill (20) at its second end. [3] Device according to claim 1 or 2, characterized bythat the housing (1) has a second end face (3) opposite the first end face (2), which is provided with a bore (6) for the passage of the drill (20). [4] Device according to claim 3, characterized by that the spring (12) is designed as a helical compression spring. [5] Device according to one of claims 2 to 4, characterized by that the drill (20) is guided in a sleeve (24) which is mounted in the housing (1) so as to be longitudinally displaceable against the force of a spring (25). [6] Device according to claim 5, characterized by that the spring (25) is designed as a disc spring. [7] Device according to claim 5 or 6, characterized by that the sleeve (24) projects slightly beyond the second end face (3) of the housing (1) when the spring (25) is relaxed. [8] Device according to one of claims 1 to 7, characterized bythat a first receiving space (8) and a second receiving space (9) are formed in the housing (1), which are separated from one another by a radially extending wall (10). [9] Device according to claim 8, characterized by that an opening (23) is provided in the wall (10) for the passage of the drill (20). [10] Device according to one of claims 8 or 9, characterized by that the first receiving space (8) has a larger inner diameter than the second receiving space (9), that the first receiving space (8) essentially serves to receive the output shaft (4), the guide (11) and the spring (12), and that the second receiving space (9) essentially serves to receive the sleeve (24) and the spring (25). [11] Device according to claim 10, characterized by that in the first receiving space (8) and in the second receiving space (9) there is arranged a sliding bush (13) which surrounds the guide (11) and the sleeve (24) respectively. [12] Device according to one of claims 3 to 11, characterized by that a holding element is arranged in the region of the second end face (3) near the bore (6) for the drill (20). [13] Device according to claim 12, characterized by that the holding element consists of two essentially diametrically opposed, tapered holding lugs (7).

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