Riveting tool for setting blind rivet nuts and/or blind rivet screws

Abstract

The invention relates to a riveting tool for setting blind rivet nuts and/or blind rivet screws, comprising a drive piston which is able to be hydraulically adjusted from an initial position toward an end position and a drawing mandrel which is able to be brought releasably into operative connection with the drive piston and is able to be adjusted by the drive piston between a rivet receiving position and a setting position. In order to provide a riveting tool of the type mentioned in the introduction, uniform setting processes of rivets being able to be carried out thereby with a high degree of repeated accuracy, it is provided that the riveting tool for fixing the setting position of the drawing mandrel comprises a setting unit comprising a stroke limiting element which is able to be adjusted in the longitudinal axial direction of the drive piston and which is able to be brought into engagement with the drive piston.

Claims

1. A riveting tool for setting blind rivet nuts and/or blind rivet screws, comprising a hydraulic drive piston adjustable from an initial position toward an end position in a longitudinal axial direction and a drawing mandrel in releasable and operative connection with the drive piston, wherein the drawing mandrel is movable between a rivet receiving position and a setting position by the drive piston as the drive piston moves from the initial position toward the end position, a setting unit with a stroke limiting element which is configured to be manually adjusted in the longitudinal axial direction of the drive piston, such that the stroke limiting element prevents further displacement of the drive piston as the drive piston is moved towards the end position so as to fix the setting position of the drawing mandrel.

2. The riveting tool according to claim 1, wherein the stroke limiting element is an adjustment bush adjustable in the longitudinal axial direction of the drive piston and connected to a latching sleeve fixed on a housing of the riveting tool via an external thread of the adjustment bush.

3. The riveting tool according to claim 2, wherein the adjustment bush comprises a stop surface of the adjustment bush facing the drive piston and the stop surface is configured to bear against a front face of the drive piston.

4. The riveting tool according to claim 2, wherein the adjustment bush further comprises one or more latching notches which engage with one or more latching bodies on the latching sleeve to allow for incremental adjustment of the setting position.

5. The riveting tool according to claim 4, wherein the one or more latching notches are formed by at least one latching groove extending in a longitudinal axial direction of the adjustment bush.

6. The riveting tool according to claim 2, wherein the drawing mandrel is releasably connected to a pressure rod which extends in the longitudinal axial direction of the drive piston through the adjustment bush.

7. The riveting tool according to claim 6, wherein the pressure rod at its end facing the drawing mandrel has a coupling element configured for releasable connection to the drawing mandrel.

8. The riveting tool according to claim 7, wherein the coupling element is further configured for releasable locking to the drive piston.

9. The riveting tool according to claim 8, wherein the at least one locking element is a latching pin moveable between the locked position and the unlocked position by an unlocking rod which extends through the pressure rod.

10. The riveting tool according to claim 9, wherein the unlocking rod is pretensioned toward a locked position and/or the drive piston is pretensioned toward the initial position.

11. The riveting tool according to claim 9, wherein the unlocking rod at its end opposing the coupling element comprises a handle having a push button adjustably mounted thereon, wherein the push button allows for actuation of the unlocking rod.

12. The riveting tool according to claim 1 wherein, a setting head arranged coaxially to the drawing mandrel is releasably fastened to the housing.

13. A riveting tool for setting blind rivet nuts and/or blind rivet screws, comprising a hydraulic drive piston adjustable from an initial position toward an end position in a longitudinal axial direction and a drawing mandrel in releasable and operative connection with the drive piston, and movable between a rivet receiving position and a setting position by the drive piston as the drive piston moves from the initial position toward the end position, a setting unit with a stroke limiting element that is configured to be manually adjusted in the longitudinal axial direction of the drive piston, such that the stroke limiting element prevents further displacement of the drive piston as the drive piston is moved towards the end position so as to fix the setting position of the drawing mandrel, and wherein the stroke limiting element is an adjustment bush that is adjustable in the longitudinal axial direction of the drive piston and is connected to a latching sleeve fixed on a housing of the riveting tool via an external thread of the adjustment bush.

14. The riveting tool according to claim 3, wherein the stop surface of the adjustment bush comprises a coating configured to dampen contact between the drive piston and the adjustment bush.

15. The riveting tool according to claim 7, wherein the coupling element comprises a socket retainer arranged in a groove on the pressure rod and which engages in a groove on the drawing mandrel.

16. The riveting tool according to claim 8, wherein the coupling element comprises at least one locking element which is adjustable between a locked position and an unlocked position.

17. The riveting tool according to claim 12, wherein the setting head is magnetically releasably fastened to the housing.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

(1) An exemplary embodiment of the invention is described hereinafter with reference to the drawings. In the drawings:

(2) FIG. 1 shows a view of a section of a riveting tool;

(3) FIG. 2 shows a perspective view of the riveting tool of FIG. 1 and

(4) FIG. 3 shows a perspective view of the drawing tool of the riveting tool of FIG. 1 consisting of the drawing mandrel and pressure rod.

DETAILED DESCRIPTION OF THE INVENTION

(5) In FIG. 1 a riveting tool 1 comprising a drive unit 2 for a drawing tool 47 shown in FIG. 3 is shown in a sectional view. The drive unit 2 of the riveting tool 1 in this case has a drive piston 3 which is adjustable inside a cylinder portion 5 of a housing 4 of the riveting tool 1 in the longitudinal axial direction of the drive piston 3.

(6) The adjustment of the drive piston 3 in this case takes place due to a hydraulic pressure. The hydraulic fluid required therefor is conducted via a connecting pipe 40, which is connected via a joint 43 to the housing 4, into the pressure chamber 48 of the housing 4. By the impingement of the pressure chamber 48 with hydraulic pressure, a displacement of the drive piston 3 in the longitudinal axial direction thereof takes place counter to a pretensioning applied by a helical compression spring 15, wherein to this end the helical compression spring 15 at one end is supported in a recess 36 on the drive piston 3 and at the other end is supported in a depression 35 on a latching sleeve 10 introduced into the cylinder portion 5 of the housing 4.

(7) The drawing tool 47 inserted into the riveting tool 1 serves for connecting the riveting tool 1 to a blind rivet nut to be set, not shown here, said drawing tool substantially consisting of a drawing mandrel 8 and a pressure rod 9 releasably connected to the drawing mandrel 8. The drawing tool 47 in its position mounted on the riveting tool 1 in this case extends in the axial direction through the housing 4, as well as the longitudinally channeled drive piston 3.

(8) In the rivet receiving position shown in FIG. 1, the drawing mandrel 8 protrudes, with its free end for arranging the blind rivet nut, out of the end of the housing 4 opposing the latching sleeve 10. The drawing mandrel 8 is located in the rivet receiving position shown in FIG. 1 in which the drive piston 3 is in its initial position, with a shoulder 39 on a pressure surface 38 of the drive piston 3. A displacement of the drive piston 3 as a result of increasing the hydraulic pressure, therefore, effects a displacement of the drawing mandrel 8 in the direction of the latching sleeve 10 according to the longitudinal adjustment of the drive piston 3.

(9) An adjustment bush 11 screwed into the latching sleeve 10 serves for limiting the adjustment movement of the drive piston 3 and the drawing mandrel 8 and thus for fixing the setting position, said adjustment bush serving as a stroke limiting element. The adjustment bush 11 is able to be screwed via an external thread 45 into the internal thread 46 of the latching sleeve 10 and thus is able to be positioned in its longitudinal axial direction relative to the housing 4. Depending on the position of the adjustment bush 11, therefore, a stop surface 33 on the adjustment bush serves as a path limiter for a front face 34 of the drive piston 3. In the setting position, not shown here, the stop surface 33 and the front face 34 bear against one another. The adjusted position of the adjustment bush 11 in this case is secured via a suitable self-locking thread connection 45, 46.

(10) Latching bodies 12 arranged on latching body carriers 14 in openings 16 of the latching sleeve 10 serve for haptic feedback of the adjusted position of the adjustment bush 11. In each case, after a half rotation of the adjustment bush 11 the latching bodies 12 come into engagement with latching grooves 13 extending in the longitudinal axial direction on the peripheral surface of the adjustment bush 11. In this case a half rotation corresponds to a longitudinal displacement of the adjustment bush 11 by mm.

(11) The pressure rod 9 and the drawing mandrel 8 of the drawing tool 47 are releasably connected together via a coupling element 29 which is screwed with an external thread 26 into an opening of the pressure rod 9 provided with an internal thread 25, wherein for the releasable connection the coupling element at its end opposing the pressure rod 9 has a groove 37 with a socket retainer 18 arranged therein. In the mounted position, this socket retainer 18 engages in a groove 19 on the drawing mandrel 8 and thus releasably blocks the drawing mandrel 8 on the pressure rod 9.

(12) In addition to the releasable arrangement of the drawing mandrel 8 on the pressure rod 9, the coupling element 29 also serves to fix the drawing tool 47 to the drive piston 3. To this end, the coupling element 29 comprises a bore 30 extending perpendicular to the longitudinal axial direction, latching pins 31 being arranged therein. In the locked position of the latching pins 31 shown in FIG. 1, said latching pins engage in a recess 32 on the drive piston 3 and thus lock the drawing tool 47 on the drive piston 3.

(13) An unlocking rod 21 shown in FIG. 1 in the locked position prevents the latching pins 31 from moving out of the recesses 32 on the drive piston 3. For dismantling the drawing tool 47, the unlocking rod 21 is able to be displaced in the direction of the drawing mandrel 8 via a push button 17 counter to a pretensioning produced by a helical compression spring 22, wherein in the unlocked position, not shown here, a tapered portion 28 comes into engagement with the latching pins 31 and permits said latching pins to move out of the recesses 32 on the drive piston 3. In the unlocked position, therefore, the drawing tool 47 may be removed from the riveting tool 1.

(14) The push button 17 for actuating the unlocking rod 21 in this case is displaceably mounted on a handle 20 which is screwed onto an external thread 23 of the pressure rod 9, wherein to this end the handle 20 has a correspondingly configured internal thread 27. A circlip 24 serves for limiting the movement of the unlocking rod 21 in the direction of the push button 17, said circlip in the locked position bearing against an internal surface of the pressure rod 9 extending perpendicular to the longitudinal axial direction.

(15) The drawing mandrel 8 comprises a guide ring 41 for linear guidance, said guide ring being integrally configured with the drawing mandrel 8 and bearing against an internal surface of the drive piston 3. The drive piston 3 in this case is displaceably mounted in a guide bushing 6, wherein the guide bushing 6 is also configured with magnet holders 42 for the releasable arrangement of a setting head 7.

LIST OF REFERENCE NUMERALS

(16) 1 Riveting tool 2 Drive unit 3 Drive piston 4 Housing 5 Cylinder portion 6 Guide bushing 7 Setting head 8 Drawing mandrel 9 Pressure rod 10 Latching sleeve 11 Stroke limiting element (adjustment bush) 12 Latching body 13 Latching groove 14 Latching body carrier 15 Helical compression spring 16 Opening 17 Push button 18 Socket retainer 19 Groove (drawing mandrel) 20 Handle 21 Unlocking rod 22 Helical compression spring 23 External thread 24 Circlip 25 Internal thread 26 External thread 27 Internal thread 28 Tapered portion 29 Coupling element 30 Bore 31 Latching pins 32 Recesses 33 Stop surface 34 Front face 35 Depression 36 Recess 37 Groove 38 Pressure surface 39 Shoulder 40 Connecting pipe 41 Guide ring 42 Magnet holder 43 Joint 44 Adjusting unit 45 External thread 46 Internal thread 47 Drawing tool 48 Pressure chamber