EP1018407B1 - Riveting tool with rotation inverting device - Google Patents

Description

The invention relates to a rivet setting tool for setting of blind rivet nuts and a reversing device according to the features of claim 1.

Rivet tools are used to set blind rivet nuts known with a pressure medium rotary motor, which for Screwing a threaded rivet nut onto a threaded bolt of the device first rotated clockwise to then as part of the actual riveting process with a for actuatable pressure medium operated pushing device, the threaded bolt for the upsetting process Threaded rivet nut to give an axial movement. To The compression medium rotary motor then ends the upsetting process controlled so that the threaded bolt to Unscrew from the threaded nut by turning to the left becomes. Such a blind rivet setting device is, for example, out of the applicant's DE-OS 37 01 883.

From practice it is known that these and similar devices often have problems moving from the right turn into the left turn, whose Function on a complicated interaction between the Pressure medium piston cylinder drive, one Rotary reversing device which is assigned to the rotary motor and a valve device which has an actuation button the pressure medium supply both to the turning device and also regulates the pressure medium piston cylinder. As Malfunctions occur in particular that none Left turn is more possible or on the contrary Hydraulic fluid rotary motor only operated in left rotation can be.

The invention is therefore based on the object Provide rivet setting tool, which reliably avoids functional disadvantages mentioned above.

This problem is solved by the features of claim 1. By a rivet setting tool for setting Blind rivet nuts is provided, which one Turning device has a valve spool and comprises a valve housing and which in a front and rear position is movable, and which one Rotary motor is equipped with a pull spindle is connected and controllable via the reversing device and which one can be actuated for the upsetting process Has pressure medium piston cylinder drive, which over the Tension spindle a threaded bolt an axial movement issued, and which also via a Actuator, by means of which both the pressure medium piston cylinder drive and the turning device is actuated, the slide housing has a Locking device, which in the valve slide engages in such a way that the position between the valve slide and Valve housing is held at least temporarily, the transition between the opening is advantageously and twisting off before and after the upsetting process setting blind rivet nut ensured.

In practice, it has proven itself for the Locking device according to the invention preferably a To use locking device, which on mechanical simple way via a suitable locking element in the Valve slide engages, so the position between Valve housing and valve spool to be fixed.

The valve spool is inside the Reversing device with radial play in one Central bore of the valve body can be moved longitudinally intervenes, so the position between the valve body and To fix the valve slide.

The valve spool is inside the Reversing device with radial play in one Central bore of the valve body can be moved longitudinally arranged. So that the locking device on the valve slide can access, is preferably a radially directed Hole that connects to the central hole in the Slider housing to accommodate the grid device brought in.

The locking device advantageously has Intervene in a locking point a locking ball and / or a locking bolt on the in the mounting hole of the Latching device are introduced. Reaches into the locking point or the locking ball towards the valve slide, so is on this way in a positive form a guiding transition in Locking and disengaging the locking device or Latching device guaranteed.

To set a snap threshold, i.e. one Force threshold that is used to axially release the valve spool from Valve housing must be overcome, includes Snap device also in a positive configuration at least one spring that the locking ball and / or the Locking bolt resiliently counter-supported under pressure and pushes it into a rest area.

In an advantageous development of the invention Locking device, this is an adjusting screw assigned by means of which the spring tension on the locking pin and / or the locking ball is adjustable. Whereby, on simple way the mutually braking effect of Locking device of the valve spool housing on the Valve spool can be controlled.

It is also advantageous that the locking device or the adjusting screw, the locking ball and / or the locking bolt Have openings and / or surrounded by an annular space be so that pressure means via the locking device, for example, compressed air, fed to the rear control chamber can be.

In a further embodiment of the subject matter of the invention preferably engages the receiving bore of the locking device in a rear located within the central bore Control chamber, this through a valve spool encompassing ring seal is formed, the between Central bore and valve slide existing space in one divides the front and a rear control chamber.

In a further positive development of the Locking device according to the invention includes this intervention or locking point, which is preferably at the head of the Valve spool are attached and in the form of a recess can be formed, in a particularly preferred Embodiment as intervention points, in double function in Trained part of the valve spool Compressed air control opening can be used and advantageously by the engagement of a locking ball, for example Pressure medium supply remains guaranteed.

In an advantageous embodiment of the subject matter of the invention are the pressure medium piston cylinder drive, the rotary motor and the turning device integrated with each other connected. Rotary motor and reversing device are in the Head of the rivet setting tool mounted axially displaceable, see above that the turning device or the valve housing for example as part of the upsetting process in the rear Position can be moved. Rear position or Position here means that the turning device or Slider housing and / or the valve slide against the Tension spindle holder is moved.

In a particularly positive form, the Valve spool and valve body reversing device Slidably arranged relative to each other, from which the very advantageous effect is that in itself joint resignation with the reverser, the Valve spool by meeting a system can be moved relative to the valve body and in Connection with this relative movement the Locking device can snap to under a Actuation gear of the rivet setting tool between Valve housing and valve spool to be fixed.

Is most advantageous in the through the Locking device set position between Valve spool and spool housing the front control chamber kept open so that via a rotary motor Pressure medium access to the rotary motor for a certain time Left-hand rotation is controlled, even if after completion of the upsetting process due to the reversing device of the decreasing pressure, moved to the front position and the valve spool moves away from its system.

In a further positive design of the The subject of the invention comprises at least the rivet setting tool a front and a rear pressure medium supply channel for supplying pressure medium to the reversing device, such that in the state of intervention of the Holding device in the valve slide under Pressurization of the rear Pressure medium supply channel the intervention of the Slider housing in the valve slide is detachable and itself the valve spool is essentially in contact with the abutment shifts.

As a result of the detachment of the holding device described, is then advantageously related to the valve spool the valve body moved to a rear position and parallel to closing the front control chamber, the rear one Control chamber opened an access to the rotary motor is released, the pressure medium is turned clockwise added.

Fig. 1

einen Querschnitt des erfindungsgemäßen Nietsetzwerkzeugs in etwa in der Ebene der Längsachse der Drehumkehreinrichtung.

Fig. 2

einen Querschnitt der erfindungsgemäßen Drehumkehreinrichtung im Detail im eingerasteten Zustand der Rasteinrichtung.

Fig. 3

einen Querschnitt der erfindungsgemäßen Drehumkehreinrichtung im Detail im nicht eingerasteten Zustand der Rasteinrichtung.

Show it:

Fig. 1

a cross section of the rivet setting tool according to the invention approximately in the plane of the longitudinal axis of the turning device.

Fig. 2

a cross section of the rotary device according to the invention in detail in the engaged state of the locking device.

Fig. 3

a cross section of the rotary reversing device according to the invention in detail in the unlocked state of the locking device.

1 shows the riveting tool 1 as a whole. This has known components as essential components in the handle and foot area an actuation button 2, a pneumatic valve 3, a valve rod 4 and a Connection valve 5 on. The pneumatic valve 3 comprises in the present embodiment, a total of two openings (3 ', 3 ''), via the compressed air connections to Turning device 12 can be produced. The creates lower pneumatic valve opening 3 '' a compressed air connection with the front control chamber 13 within the Turning device 12 and the upper pneumatic valve opening 3 'a pneumatic connection with the rear Control chamber 14 of the turning device 12. The general supplied via an external compressor, for example Compressed air supply is controlled via the connection valve 5. in the not or only weakly depressed state of the Actuator button 2 is the connection valve for compressed air opened so that the pneumatic valve with compressed air is acted upon and this by means of the openings 3 'and 3 '' of the reversing device can be fed, whereby the upper pneumatic valve opening only when the button is pressed slightly Actuating lever is open, the lower pneumatic valve opening however, both im not and weak pressed state is open, so that the front control chamber 13 in both positions of the pneumatic valve 3 is under compressed air.

In the foot and grip area is also housed Pneumatic piston 6 and the pressure piston 7. From the pressure piston 7 is part of the upsetting or pulling process in the essential incompressible hydraulic fluid, preferably oils, via a hydraulic line in the cylinder of the working piston 8 pressed. The working piston is in the Rivet setting tool head via the feed screw 9 with the Draw pin receptacle 10 in connection and is also related on the rear part of the rivet setting tool 1 in integrated form via the rotary motor 11 with the Turning device 12 linked, so that in this way during the pulling or compressing phase, which is in the head part of the Rivet setting tool 1 arranged longitudinally displaceable Turning device 12 and also movable arranged rotary motor 11 in different axial positions are displaceable within the rivet setting tool head 1, being within the control of the transition between the Left and right rotation of the rotary motor essentially to the position of the turning device before and after Completion of the upsetting process arrives.

2 is a detail of the invention Turning device 12 to remove. The Turning device consists of according to Figures 2 and 3 a valve spool 15 and a spool housing 16, wherein the slide housing 16 has a central bore 17 for receiving it of the valve spool 15 includes. The central bore has three Areas 17 ', 17' 'and 17' '' that differ with respect to their Differentiate cross-section. The between the areas 17 ' 17 '' 'smallest diameter area, serves in the essentially as the shaft guide of the valve slide 15. In the front area 17 'of the central bore 17 is a rear one Coil spring 18 arranged. The one in the form of a plate coil spring base is at the foremost end of the Central bore 17 fastened via a screw connection, the coil spring foot to the side of the wall Central bore 17 has a groove in which Ring seal extends the central bore 17 to the front seals. The helical spring also comprises in the region 17 ' its end with reference to the smaller diameter area 17 '' a spring plate 19, on the top surface of one circular sealing groove was attached such that after Insert a suitable ring seal or front one Control seal 20, this in the stretched state of the Coil spring on the transition edge between the areas 17 'and 17' 'rests and the space created by the spring retainer 19 and the spring foot is formed and also as Pressure medium supply area of the front control chamber 13 is essentially airtight against the Residual space 17 "and 17" between central bore 17 and Valve slide 15 closes. This conclusion is especially when the threaded bolt is in Rest position.

In the named rest position is the Valve slide 15 within the remainder of the Central bore 17, i.e. essentially above the Pressure control area of the front control chamber 13. Er consists of a shaft part 15 'and a head part comprising the valve spool head 15 '' and Valve slide extension 15 '' '. The shaft 15 'of the Valve slide 15 is located or runs in substantially within the central region 17 '' of the Central bore 17. Essentially in the middle of the shaft 15 'there is a sealing trench in which one Ring seal that runs with the central bore wall is in the sliding seal seat and the between the central bore 17th and valve slide 15 located space in a front 13 and a rear control chamber 14 divided. On the front End of the valve spool 15 designed as a hollow cylinder or valve slide shaft 15 ', the edges of which are light bevelled.

In the head area 15 ″ and 15 ″ ″ of the valve slide 15 enough with respect to the stem part 15 'of the valve slide diameter-smaller extension 15 '' '. On the back end of the hollow cylindrical extension 15 '' 'is a sleeve-shaped Termination 15 '' applied. The sleeve 15 '' has Inside a three-step profile, with the middle Stage sits a rear coil spring 22, the Grips valve spool and is guided by this. The Coil spring 22 has a rear at its front end Spring plate 23 with a central opening for receiving the Valve slide 15 on. The rear spring plate 23 has furthermore two sealing grooves for receiving sealing rings on. The first sealing groove is directed so that a Sliding seal seat between valve slide 15 and spring plate 23 arises. The second sealing groove is on the Head side of the spring plate 23. This groove is L-shaped trained and therefore has none on the inside Guide wall which the inserted sealing ring 21 with respect delimits the valve slide 15, so that the second Sealing ring 21 in the sliding seat with Valve slide 15 is located. Depending on the position of the Valve spool 15 sits with respect to the spool housing 16 the spring plate 23 or the second sealing ring 21 either on the edge caused by the transition from the larger diameter Shaft part 15 'of the valve slide 15 for diameter-smaller extension 15 '' 'of the valve spool is formed or sits on the edge at the transition between the opening areas 17 'and 17' '' and thereby seals the Room 17 '' 'against the rest of the room. As from Figures 2 and 3 can be seen, the sleeve 15 '' forms the rear end and in certain positions also the side closure of the rear control chamber 14 or the pressure medium supply area 14 'of the rear control chamber 14.

The outside of the sleeve 15 '' has a substantially two-stage profile. At the end of the first level is a laterally with respect to the central bore wall 17 Sealing groove has been introduced into the sleeve 15 '' a sealing ring is inserted so that the sleeve 15 '' or the head of the valve slide 15 against the central bore 17th seals in the sliding seal seat. Also in the sleeve shell a plurality of radially directed control bores 24 for the supply of compressed air introduced into the rear control chamber 14. At the The rear of the sleeve 15 '' is in the area of the rear Sleeve opening formed the second stage, which in the Jaw opening 25 of an at least partially axially displaceable Adjustment device 26 is essentially positive engages, the axial displacement of the Adjustment device 26 and thus also that of the valve slide 15 is limited by a stop 27 to the rear.

The locking device 28 is directed in a radial direction Bore 29 of the valve housing 16 introduced, the rear central bore area 17 '' 'in its front part cuts. It essentially comprises from the inside out three parts arranged one behind the other. These are the Locking ball 30 and a not shown locking spring and one Adjustment screw through which the preload on the locking ball 30 is adjustable. The radial bore 29 fulfills one Dual function. On the one hand, it serves to accommodate the Locking device 28 and on the other hand as a compressed air supply rear control chamber 14 via, for example, the Control hole 24. The air supply can be in or on the adjusting screw and the detent ball 30 grooves or channels can be ensured. Such a channel is For example, an annular space around the locking device 28 is arranged within the bore 25.

The described double function makes it possible instead of an additional depression, a control opening 24 to use as a snap. The locking ball 30 engages only so far in the control opening, so that a Relative movement of the slide housing 16 against the Valve slide 15 can be prevented and that still enough play between locking ball 30 and opening the Control bore 24 remains so that a compressed air supply over the receiving bore of the locking device for the control bore 24 is possible.

The starting position of the turning device 12 is in Figure 1 shown. The working piston 8 is located together with the turning device 12 when the handle is not actuated 2 in the foremost position. In this starting position the front pressure medium supply area 13 'opposite front pressure medium discharge area 13 "of the front Control chamber 13 closed, so that despite one Compressed air pressure over the open lower one Pneumatic valve 3 "no compressed air connection via the Pressure medium discharge area 13 "does not determine one shown controlling the counterclockwise rotation of the rotary motor first Compressed air access channel to the rotary motor.

In contrast, the rear control chamber 14 open. That the valve slide 15 within the Slider housing 16 is referenced to the slider housing 16 moved backwards. As a result, the rear control seal ring 21 in the rear position and opens a connection between it and the transition edge the areas 17 "and 17" 'and thus the rear control chamber 14, so that when pressurized by means of a second connecting to the rear compressed air discharge area 14 " Compressed air access channel to the rotary motor 11, this in a Right turn can be offset. However, since in the above not described position of the actuating button 2 is pressed, the upper pneumatic valve opening 3 ' closed and thus the pressure supply to the rear Control chamber 14 interrupted. Furthermore, in the rear Position of the valve spool or the front position of the Slider housing 16, the control bore 24 of the Valve slide head 15 '' with reference to the Compressed air supply channel 31 moved to the rear so that a direct compressed air supply to the above described Release connection.

If the actuation button 2 is pressed lightly, it opens also the upper pneumatic valve opening 3 '. Accordingly, as already explained above, the open one rear control chamber 14 supplied with compressed air and the Air motor 11 set clockwise, so that a rivet can be turned up.

If the rivet is screwed onto the draw bolt, the Push button 2 fully pressed and over the Valve rod 4 actuates the exclusion valve 5 such that the external air supply to the pneumatic valve 3 is cut off and the upsetting process by pressurizing the Pneumatic piston 6 is initiated. As part of the The upsetting process is the working piston 8 and thus also the Turning device 12 from its forward position to one rear position shifted. However, the in Central bore 17 of the slide housing 16 axially displaceable mounted valve spool 15 in its rearward movement by the stop 27, which on the adjusting device 26th meets with the valve spool 15 essentially in Plant is inhibited. This means that the Valve slide 15 when resetting the turning device 12 or the slide housing 16 essentially in its Starting position remains so that the slide housing 16 can move with respect to the valve slide 15. As a result the displacement of the slide valve housing 16 becomes the front one Control seal 20 lifted out of its original seat and This opens the front control chamber 13, so that at potential pressurization of the front control chamber 13 the rotary motor 11 can be rotated to the left. Alternatively, the rear control chamber becomes when resetting closed by the central bore areas 17 '' and 17 '' ' be moved to the rear control seal. At the same time, a connection between the Control bores 24 and the compressed air supply channels 31 and 29 manufactured. Whereby due to this connection the Latching device 28 engages in one of the control bores 24 and the axial relative movement between the valve spool and Slider housing essentially limited.

When the upsetting process is finished, the Release button 2 released and does not return to the actuated state. As a result, it becomes reciprocal via the valve rod 4 and the connecting valve 5 Compressed air supply to the pneumatic piston 6 interrupted and the open to the pneumatic valve. This means that in Relation to the position of the Valve spool 15 with respect to the spool housing 16, at non-actuated pusher 2, compressed air through the lower Pneumatic valve opening 3 '' over the open front Control chamber 13, the rotary motor is supplied. And that's the way it is Compressed air supplied to the left-hand rotation of the rotary motor and thus leads to twisting off the rivet from the draw bolt.

In parallel to the process described above, shifts the working piston 8 due to the hydraulic pressure relief and the spring balance by the spindle spring 32, together with the turning device 12, again in the front Initial state. In this case, the valve slide 15 not with the slide housing 16 via the locking device 28 locked, the valve spool 15, whose beveled front end, in the rear position of the Turning device 12, due to the bias with the front coil spring 18, by the relative displacement between slide housing 16 and valve slide 15, with the Valve slide 15 sits in the sealing seat, lifted out of this and likewise the front control chamber 13, by the stretching the coil spring 18 closed and thus the left turn ended shortly after the upsetting process.

To avoid this effect, we take action as above shown the locking device 28 on the slide housing 16th after the upsetting process in the valve slide 15 and achieved in that the relative movement between Valve spool 15 and spool housing 16 is restricted. Depending on the preload, which is due to the detent spring on the Locking ball is exercised and by the adjusting screw is adjustable, the force threshold for the disengagement Locking device is adjustable from the rest point. To this This ensures that even after the upsetting process the front control chamber 13 remains open and the rotary motor 11 lingers to the left, even if the Turning device 12 as a whole, i.e. with the Slider housing 16 and the valve slide 15 from the stop 27 away, move forward.

To get back to the starting position from Figure 2 arrive, i.e. back to the position in which the Rotary motor 11 is at rest and the valve slide 15 on Stop 27 is present, it is necessary to the locking position to loosen between valve spool 15 and spool housing 16. This happens because the actuating button 2 in turn is easily actuated so that there is a pneumatic Connection also to the pressure medium supply area 14 'of the rear control chamber 14 builds. Because the front control chamber 13 and the rear control chamber 14, only opened alternately or are closed, the rear one is Control sealing ring 21 in the sealing seat to the central bore 17. Will now the rear pressure medium supply area 14 'with compressed air pressurized, this presses on the inside of the sleeve 15 '' and presses the valve slide 15 over the Latching threshold backwards until it stops 27 comes in plant. This movement is supported by the rear coil spring 22.

Reference numerals:

1

rivet setting tool

2

operating pusher

3

Pneumatic valve

3 '

upper pneumatic valve opening

3 "

lower pneumatic valve opening

4

valve rod

5

connecting valve

6

Pneumatic piston

7

pressure piston

8th

working piston

9

Zuspindel

10

Zubolzenaufnahme

11

rotary engine

12

Rotation reversing device

13

front control chamber

13 '

front fluid supply area

13 ''

front pressure medium discharge area

14

rear control chamber

14 '

rear fluid supply area

14 ''

rear pressure medium discharge area

15

valve slide

15 '

Spool shaft

15 "

Sleeve, valve spool head

15 " '

Spool extension

16

slide housing

17

central bore

17 '

front area of the central bore

17 ''

middle area of the central bore

17 '' '

rear area of the central hole

18

front coil spring

19

front spring plate

20

front control seal

21

rear control sealing ring

22

rear coil spring

23

rear spring plate

24

control bore

25

opening

26

adjustment

27

attack

28

locking device

29

Locking bore / Druckluftzuführungskanl

30

detent ball

31

Compressed air supply duct

32

stem spring

Claims (16)

1. A rivet setting tool (1) for setting blind rivet nuts with

   a rotation reversing device (12) comprising a valve spool (15) and a spool housing (16), said device being movable into a front or rear position,

   a pressure medium rotary motor (11) which is connected to a tension spindle (5) and the direction of rotation of which is controllable by means of the rotation reversing device (12),

   a pressure medium piston and cylinder device (6, 7, 8) which is adapted to be actuated for the upsetting operation and which imparts an axial movement to a screw bolt via the tension spindle (9), and with

   a device (2, 3, 5) for actuating the pressure medium piston and cylinder device (6, 7, 8) and the rotation reversing device (12),

   characterised in that
   the rotation reversing device (12) comprises a locking device (28) for at least temporary fixing the position between the valve spool (15) and the spool housing (16), the locking device (28) engaging in the spool (15) in the locked position thereof.
2. A rivet setting tool according to claim 1, characterised in that the locking device comprises a detent device (28).
3. A rivet setting tool according to claim 2, characterised in that the spool housing (16) has a central axial bore (17) to accommodate the valve spool (15), adjoining which bore (17) there is a radially directed bore (29) to receive the detent device (28).
4. A rivet setting tool according to claim 2 or 3, characterised in that the detent device (28) comprises a detent bolt and/or a detent ball (30).
5. A rivet setting tool according to claim 2, 3 or 4, characterised in that the detent device (28) comprises at least one spring for counter-mounting of the detent ball (30) and/or of the detent bolt.
6. A rivet setting tool according to anyone of claims 2 to 4, characterised in that the detent device (28) comprises an adjusting screw to adjust the prestressing of the spring on the detent bolt and/or the detent ball (30).
7. A rivet setting tool according to anyone of the preceding claims, characterised in that the adjusting screw and the detent ball (30) and/or the detent bolt have pressure medium openings and/or the locking device (28) has an annular chamber for the pressure medium supply.
8. A rivet setting tool according to anyone of the preceding claims, characterised in that the rotation reversing device (12) comprises a front and a rear control chamber (13, 14), the locking device (28) being disposed substantially in the region of the rear control chamber (14).
9. A rivet setting tool according to anyone of the preceding claims, characterised in that the locking device (28) has an engagement point on the head (15") of the valve spool (15) and is constructed in the form of a recess.
10. A rivet setting tool according to anyone of the preceding claims, characterised in that the engagement points is at least control opening (24) at the head of the valve spool (15).
11. A rivet setting tool according to anyone of the preceding claims, characterised in that in the head of the rivet setting tool (1) the pressure medium piston and cylinder device and the rotary motor (11) and the rotation reversing device (12) are integrally interconnected so as to be axially displaceable.
12. A rivet setting tool according to anyone of the preceding claims, characterised in that the rivet setting tool (1) has an abutment device (27) for abutment of the valve spool (15) on the return movement into the rear position of the rotation reversing device (12).
13. A rivet setting tool according to anyone of the preceding claims, characterised in that in the locking position between the spool housing (16) and the valve spool (15) the front chamber (13) opens as a pressure medium passage for the anticlockwise rotation of the motor (11) and the rear control chamber (14) closes as a pressure medium passage for the clockwise rotation.
14. A rivet setting tool according to anyone of the preceding claims, characterised in that the rivet setting tool (1) comprises at least one front and one rear pressure medium supply duct for the supply of pressure medium to the rotation reversing device (12) in such manner that engagement of the locking device (28) of the spool housing (16) into the valve spool (15) is releasable and the valve spool (15) is displaceable substantially in contact with the abutment (27), pressure medium being applied to the rear pressure medium supply duct (31) .
15. A rivet setting tool according to anyone of the preceding claims, characterised in that the spool housing (16) in the front position closes the pressure medium passage for anticlockwise rotation of the motor (11) and opens a pressure medium passage for clockwise rotation.
16. A rivet setting tool according to anyone of the preceding claims, characterised in that the valve spool (15) is disposed in a central bore (17) of the spool housing and the rotation reversing device (12) also comprises at least one annular seal for forming at least one control chamber (13, 14) and at least one coil spring (18, 22) to actuate the valve spool (15).

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