DRIVING-IN DEVICE

Abstract

The invention relates to a driving-in device, comprising a handheld housing, a piston element received in a piston guide for transmitting energy from a propelling charge to a securing element to be driven, and a front part which is removably connected to the piston guide. The front part and the piston guide can be moved relative to each other parallel to a central axis (A) of the piston element, and the front part is released from the piston guide by rotating the front part relative to the piston guide by a release angle, wherein a torque barrier of a securing element is overcome upon rotating by the release angle.

Claims

1. A driving-in device, comprising a handheld housing, a piston guide, a piston element received in the piston guide for transmitting energy from a propelling charge on to a fastening element to be driven in, the piston element having a central axis (A); a front part releasably connected to the piston guide, and a securing element having a torque barrier, wherein the front part and the piston guide can be moved relative to each other parallel to the central axis (A) of the piston element, and wherein releasing the front part from the piston guide comprises a relative rotation of the front part and the piston guide about a release angle, and overcoming the torque barrier of the securing element.

2. The driving-in device as claimed in claim 1, wherein the securing element comprises at least one guiding element supported in a spring-elastic manner, on the front part or on the piston guide.

3. The driving-in device as claimed in claim 2, wherein the guiding element runs in a guideway provided on the respective other of the front part or the piston guide, and extends in parallel to the central axis (A).

4. The driving-in device as claimed in claim 3, comprising at least one axial release position, including a transverse way branching off from the guideway in a circumferential direction, wherein the transverse way has a reduced depth compared to a depth of the guideway, forming the torque barrier.

5. The driving-in device as claimed in claim 4, further comprising a disassembly way extending in parallel to the guideway, wherein the guiding element can enter into the disassembly way from the guideway via the transverse way.

6. The driving-in device as claimed in claim 4, wherein the axial release position is located near an axial end position of the guideway.

7. The driving-in device as claimed in claim 6, wherein the guideway has two axial end positions, and each of the two axial end positions of the guideway has an axial release position with one transverse way branching off in a circumferential direction.

8. The driving-in device as claimed in claim 2, wherein the guiding element is formed as a sphere.

9. The driving device as claimed in claim 1, wherein the securing element comprises a guiding element, and the guiding element is retained in a bore by a spring-elastic retention ring.

10. The driving-in device as claimed in claim 5, wherein the axial release position is located near an axial end position of the guideway.

11. The driving-in device as claimed in claim 10, wherein the guideway has two axial end positions, and each of the two axial end positions of the guideway has an axial release position with one transverse way branching off in a circumferential direction

12. The driving-in device as claimed in claim 3, wherein the guiding element is formed as a sphere.

13. The driving-in device as claimed in claim 4, wherein the guiding element is formed as a sphere.

14. The driving-in device as claimed in claim 2, wherein the guiding element is retained in a bore by a spring-elastic retention ring.

15. The driving-in device as claimed in claim 3, wherein the guiding element is retained in a bore by a spring-elastic retention ring.

16. The driving-in device as claimed in claim 4, wherein the guiding element is retained in a bore by a spring-elastic retention ring.

17. The driving-in device as claimed in claim 5, wherein the guiding element is retained in a bore by a spring-elastic retention ring.

18. The driving-in device as claimed in claim 6, wherein the guiding element is retained in a bore by a spring-elastic retention ring.

19. The driving-in device as claimed in claim 7, wherein the guiding element is retained in a bore by a spring-elastic retention ring.

20. The driving-in device as claimed in claim 10, wherein the guiding element is retained in a bore by a spring-elastic retention ring.

Description

[0023] Further features and advantages of the invention will result from the embodiment example as well as from the dependent claims. A preferred embodiment of the example will be described below and will be explained in more detail by means of the attached drawings, wherein:

[0024] FIG. 1 shows a spatial overall view of a driving-in device according to the invention;

[0025] FIG. 2 shows a spatial view of a piston guide of the driving-in device from FIG. 1 with a front part fixed thereon in a displaceable manner;

[0026] FIG. 3 shows a spatial detailed view of the piston guide from FIG. 2 with the disassembled front part;

[0027] FIG. 4 shows a spatial detailed view of the front part from FIG. 2 with a disassembled piston guide;

[0028] FIG. 5 shows a sectional view along a central axis A through the piston guide with a fixed front part from FIG. 2;

[0029] FIG. 6 shows a sectional view through the assembly from FIG. 5 along the line B-B.

[0030] A driving-in device according to the invention comprises a handheld housing 1, in which a piston element in the form of a piston (not shown) is received. The piston element is located in a piston guide 2 with a combustion chamber, in which the combustion gases of a pyrotechnical charge 3 expand, in order to accelerate the piston.

[0031] The piston which has motion energy applied thereto in this way impinges with an end-side plunger on a fastening element 4, which is as a result driven into a workpiece. The fastening element 4 is inserted into a muzzle part 5, which in turn is received in a front part 6 of the piston guide 2. The fastening element 4 and the muzzle part 5 are formed to be rotationally symmetrical about a central axis A. The central axis A is at the same time a central axis of the piston guide 2 and of the piston element.

[0032] The front part 6 is pushed via the piston guide 2 and is detachably fixed to the piston guide by means of a securing element 7. In this fixed condition (see FIG. 2, FIG. 5 and FIG. 6), the front part 6 and the piston guide 2 may be displaced relative to each other by a stroke H, until the displacement is terminated by a stop.

[0033] Via this stroke, during operation of the driving-in device, a securing mechanism is actuated in a known manner, which allows the charge 3 to be triggered only if the device is placed on a workpiece and the front part is pushed in with a sufficiently great pressing force by a complete stroke H.

[0034] The subject matter of the invention is presently the detachable fixing of the front part 6 on the piston guide 2. To this end, a guideway 8 is moulded onto the outside of the piston guide 2, which has a substantially part-circular cross section. The guideway 8 is engaged by a guiding element 9 in the form of a sphere made from steel. The length of the guideway 8 corresponds to the axial stroke H, and both ends of the guideway are closed.

[0035] The sphere 9 is held in a spring-elastic manner from the outside by means of a snap ring 10 in a bore 11 in the wall of the front part 6. The bore 11 has a maximum diameter that remains below the diameter of the sphere 9, so that the sphere 9 protrudes partially on the inside of the wall, but cannot fall out.

[0036] Parallel to the guideway 8, a disassembly way 12 extends, one end of which opens out into the edge of the piston guide 2.

[0037] From each of the ends of the guideway 8, in each case a transverse way 13, 14 extends in the circumferential direction up to the parallel disassembly way 12. Each of the transverse ways 13, 14 has a reduced depth compared to the disassembly way 12 and the guideway 8.

[0038] The invention works as follows:

[0039] Initially, the assembled module consisting of the front part 6 and the piston guide 2, in which the piston and the muzzle piece 5 are located, is removed from the driving-in device, and if necessary, a retention element is opened prior to that. Subsequently, the piston guide 2 and the front part 6 are disassembled from each other, in order to remove the piston and to carry out, as needed, any cleaning and maintenance works.

[0040] In the course of this, the front part is initially pulled out or pushed in up to the stop of the sphere 9 at one end of the guideway 8. Proceeding from this end position, the front part is rotated relative to the piston guide by a release angle of presently approx. 20, and the sphere 9 extends over a corresponding transverse way 13, 14 into the disassembly way 12. In the course of this, the sphere is pushed in against the force of the snap ring via a section of movement, because the transverse way 13, 14 has a reduced depth. As a result, a torque threshold has to be exceeded during the rotation.

[0041] As soon as the sphere 9 runs in the disassembly way 12, the front part 6 can be pulled off from the piston guide 2.

[0042] The subsequent assembly process is carried out correspondingly in the opposite order.

[0043] As shown in the drawings, presently two identical securing elements 7 made up of the disassembly way 12, the guideway 8, the transverse ways 13, 14 and the sphere 9 are provided, which are arranged on the components 2, 6 offset by 180. As a result, a particularly uniform and low-friction guiding of the front part 6 on the piston guide is ensured.