EP2564949B1 - Riveting device with tiltable head - Google Patents

Description

Field of the invention

The invention relates to a blind riveting tool with a hydraulically actuated pulling device.

Background of the invention

Riveting equipment with a hydraulically operated pulling or pressing device are known. In particular, there are Handnietgeräte which are compressed air. Usually, a pneumatic piston is moved over the connected compressed air, via which a hydraulically operated traction device is supplied with pressure. This concerns in particular Blindnietgeräte, with which the components to be joined can be riveted from one side.
It draws a claw comprehensive traction device on a rivet pin, this breaks off after formation of a rivet.

A disadvantage of known riveting tools, above all, is that they are relatively unwieldy and can not be used in many places, for example in cavities of a vehicle body to be manufactured. Among other things, this is due to the necessary diameter of the pneumatic piston installed in the devices.

Object of the invention

The invention is based on the object to reduce the mentioned disadvantages of the prior art.

In particular, a handy Blindnietgerät to be provided, in which the accessibility is improved even in hard to reach places.

The generic document DE 103 16 578 A1 shows a blind riveting tool with rotatable head.

Summary of the invention

The object of the invention is already achieved by a Blindnietgerät according to the independent claim 1.

Preferred embodiments and further developments of the invention can be found in the subclaims.

The invention relates to a riveting device with a hydraulically operated traction device, which is designed as a blind riveting tool.

By means of a riveting tool, a component to be processed is deformed in such a way that the component itself is fastened and / or connects two components to be joined together.

According to the invention, a head piece comprising a hydraulic piston and a rivet receiving means is pivotable about a support about at least one axis.

The basic idea of the invention is based on the fact that it is possible to decouple the traction device with a hydraulically actuated piston, which as a rule has a substantially smaller diameter than the pneumatic piston which is used for pneumatically driven riveting devices, from the remaining components of the riveter this is pivotable about at least one axis.

Thus, it is possible to provide a pivotable head piece whose diameter substantially corresponds to the diameter of the piston and cylinder of the pulling or pressing device.

Due to the pivoting of the head piece now hard to reach places are easily accessible.

According to the invention, the carrier is connected via a quick coupling with a pressure generator, wherein the quick coupling comprises a fluid passage for hydraulic fluid.

Hydraulic fluid, which drives the piston of the traction device at high pressure, typically with a pressure of more than 20, preferably more than 50, is thus produced in a separate pressure generator, which can be connected to the carrier. According to the invention, this is done via a quick coupling, which has a self-closing valve for hydraulic fluid. This has the advantage that the front part of the riveting device consists only of relatively small carrier and traction device, where against the other Components, in particular the pneumatic range of the device, is spaced therefrom.

The riveting device can be designed in particular together with the pressure generator as Handnietgerät.

It is conceivable that an actuating device for triggering the riveting device is part of the pressure generator.

It is also conceivable to connect the pressure generator via a hydraulic line to the carrier and to arrange the actuating device on the carrier or on a handle connected to the carrier.

The head piece is according to the invention at least by an angle of 45 °, more preferably at least 90 ° pivotable about the carrier.

In order to ensure a particularly safe and compact design, the hydraulic fluid is passed according to the invention via the rotary feedthrough of a pivot joint in the head piece.

In a preferred embodiment of the invention, the riveting device has a pivot joint with a latch, in which the head piece is locked at defined angles and can be moved again, for example by pressing an actuator. This has the advantage that the head does not rotate unintentionally when using the riveting tool.

As a pressure generator, a pressure generator is used in a preferred embodiment of the invention, which comprises a pneumatic piston over which a hydraulic piston for generating the hydraulic pressure is moved.

In particular, it is provided to use a pressure generator which operates on the principle of a pump. In this case, a pneumatic piston, which is moved in an oscillating manner by means of a reversal, is connected to a hydraulic piston which, via a suction and pressure valve, pumps hydraulic fluid into the working space of the hydraulic piston of the traction device upon actuation of the device.

This principle allows, on the side of the pressure generator, the use of a hydraulic piston with a relatively small diameter and thus large transmission ratio relative to the pneumatic piston used. At the same time, a relatively small pneumatic piston can be installed in order nevertheless to be able to generate high pressures, in particular pressures of more than 50 bar, preferably of more than 500 bar.

Due to this mode of operation as a pump is further ensured that sufficient hydraulic fluid can be provided.

Description of the drawings

The invention will in the following reference to schematically illustrated embodiments with reference to the drawings Fig. 1 to Fig. 13 be explained in more detail.

Fig. 1 shows a perspective view of a riveting device. 1

The riveting tool 1 comprises a head piece 2 with a receiving device 4 for a rivet, in this case for a blind rivet.

The head piece 2 is pivotable about the carrier 3 by means of a pivot bearing 5, which is mounted in the front region on the head piece.

The carrier 3 comprises a quick coupling 6, by means of which the carrier 3 in this embodiment, for example, with a pressure generator (not shown) can be connected. The quick coupling 6 comprises a self-closing valve for hydraulic fluid.

Fig. 2 shows a sectional view of the in Fig. 1 Riveter shown. To recognize is on the one hand, the head piece 2, which has a piston 9 to reset the traction device, which claws 7, reset. For this purpose, hydraulic fluid is passed via the channel 12 into the working chamber 10 of the piston 9. In order to drive forward again after completion of a riveting operation, the piston 9 is held by a spring 11 under prestress.

It can also be seen that the head piece 2 is very compact, since it has only the diameter of the housing of the working space 10.

Otherwise, the head piece 2 corresponds to essentially known pulling devices of riveting devices and has a removable sleeve 8, in which a replaceable Receiving device 4 can be used to adjust the head piece 2 different rivet sizes.

It is understood that sleeve 8 and receptacle 4 may also be integrally formed.

At the back, the head piece 2 comprises a removable container 13, in which torn-off rivet pins are collected.

The channel 12, which supplies the working space 10 with hydraulic fluid is connected via a rotary feedthrough 14 with the channel 15 which passes through the carrier 3, respectively.

The channel 15 passes into the quick coupling 6, which includes a self-closing valve 16 for hydraulic fluid.

Referring to Fig. 3 , which is a detailed view of the Fig. 2 shows, the essential components of the quick coupling are explained in detail.

The quick coupling comprises a housing 19, which via a sealing connection piece 21 with the carrier (3 in Fig. 2 ) connected is.

In the housing 19 is seated by means of the spring 18 under prestressed axially displaceable sleeve 17. The sleeve 17 has a central bore in which the non-axially displaceable pin 20 is seated.

When coupling together now the sleeve 17 is pushed back by a corresponding ring of the opposite clutch, at the same time the pin 20 opens the also self-closing valve of the corresponding quick coupling. It is released as a channel through which hydraulic fluid can flow.

The housing 19 also has a groove, which serves the positive mechanical connection of the corresponding quick coupling.

Fig. 3 shows a view of the rivet receiving the head piece 2. It should be noted that the support 3 in the front region is not substantially wider than the head piece, thus maximally twice the width.

Evident is also an actuating element 25 for a locking of the pivot bearing, as with reference to Fig. 5 which is a sectional view along the line EE of the Fig. 4 shows, is explained in more detail.

The latching 22 includes a plurality of circular segment-shaped recesses 23 in this embodiment, into which, when not pressed, as in the detail view according to FIG Fig. 6 shown, an engagement element 24 engages. The recesses 23 are distributed along a circular arc around the center of the pivot bearing 5.

Fig. 7 shows a sectional view taken along the line DD Fig. 4 , Evident is the quick coupling 6, which is connected by means of the connecting piece 21 with the carrier 3.

The hydraulic channel 15 along the carrier 3 merges into the vertical channel 26. This is introduced via a hole from the side, which is then closed. Then adjoins a channel 26 perpendicular channel 27 to laterally introduce hydraulic fluid into the rotary feedthrough 14. The rotary feedthrough 14 is part of the pivot bearing fifth

FIGS. 9 and 10 show sectional views along the lines BB and CC of FIG Fig. 8 shown side views of the riveting device.

As in the illustration according to Fig. 9 can recognize, via the channel 28 hydraulic fluid from the rotary feedthrough 14 flow into the working space of the head piece and so reset the piston of the pulling device.

Fig. 10 shows a further detail of the locking mechanism.

This comprises an actuating element 25, which is held by means of a spring 29 under bias. Upon depression of the actuating element 25, the engagement element 24 connected thereto is displaced to the left in this view and releases the latching.

Fig. 11 shows a riveting in which the carrier 3 previously shown with the head piece 2 with a pressure generator 100 is connected. For this purpose, the quick coupling 6 of the carrier 3 is connected to the quick coupling 800 of the pressure generator. The pressure generator 100 comprises a compressed air connection 600 and an actuator 200 for triggering the riveting operation.

Details of the pressure generator 100 are shown in the following drawings Fig. 12 and Fig. 13 described.

Fig. 12 shows a perspective view of a pressure generator 100th

The pressure generator 100 comprises a housing 500 which, in this exemplary embodiment, has three parts and comprises a head piece, a middle piece and an end piece.

At the end of the housing 500, an actuator 200 is mounted, via which the pressure generator is put into operation. The actuating device 200 is arranged under a handle 400.

Behind the actuator 200 is a pressure regulator 300, via which the pressure in the pneumatic range and thus also the pressure in the hydraulic range can be adjusted. Via a compressed air connection 600, the pressure generator 100 can be connected to compressed air.

At the front of the pressure generator 100 is a quick coupling 800, which centrally has a self-closing hydraulic valve 900. By means of the quick coupling 800, a pulling or pressing device (not shown) can be attached to the pressure generator 100.

Via the self-closing hydraulic valve 900 hydraulic fluid can be passed into the pulling or pressing device in this case.

At the front housing part, a safety actuator 700 is arranged.

Depending on the embodiment variant, a device with a two-hand operation can be provided via the safety actuation device 700 such that both the safety actuation device 700 and the actuation device 200 must be actuated in order to generate pressure.

In an alternative embodiment, the safety actuator 700 must be moved to the active position shown herein prior to actuation of the actuator 200. After the actuating device 200 has been released again upon completion of a riveting operation, the safety actuating device 700 folds forward and the next pulling or pressing operation can only be carried out again when the safety actuating device 700 is folded back into the position shown here.

On the side is still a screw 1000 in the housing 500, opened over the hydraulic area and hydraulic fluid can be refilled.

Fig. 13 shows a sectional view of the in Fig. 12 shown pressure generator 100, based on which the function of the pressure generator to be explained in more detail.

About the compressed air connection 600 of the pneumatic area, so the area in which the device is in compressed air, connected to a compressed air source, such as a compressor.

The pressure regulator 300 is designed as a so-called upstream pressure regulator. The valve seat 6300 is set in position via a threaded drive of the pressure regulator 300. The piston 6400, which is biased downwards by a spring, is flowed through in the middle by compressed air. By adjusting the valve seat 6300, the spring force and thus the adjusted working pressure changes. The flow control valve 6100 regulates the air volume.

The function of an upstream pressure regulator is otherwise known to the person skilled in the art and requires no further explanation.

Compressed air can be conducted via the switching valve 6600 into the working chamber 1400 of the pneumatic piston 1300 via the channel 6800.

Upon actuation, in this embodiment thus when the actuating device 200 is pressed down and the switching valve 1200 thus coupled by means of the pin 1100, compressed air flows into the working chamber 1400 of the pneumatic piston 1300 via the channel 6500. The pneumatic piston 1300 is coupled to the smaller hydraulic piston 1800 or pneumatic piston 1300 and hydraulic pistons 1800 may form a component. As a result of the inflow of compressed air, the pneumatic piston 1300 is initially moved to the left starting from the position shown here.

When the control bore 6200 is exceeded, compressed air flows from the working space 1400 through the channel 1600 to the pilot control valve 5400, which takes over the control of the pneumatic piston 1300. By the air flowing through the channel 1600 compressed air then a piston 6600 of the pilot control valve 5400 is moved to the left and the valve opens. Compressed air can now flow out of the working space 1400 of the pneumatic piston 1300 via a silencer (not shown) into the atmosphere via the exhaust air chamber 5800.

Since now the pressure in the working chamber 1400 decreases, the pneumatic piston 1300 is moved to the right via the spring 1700 until the piston 1300 touches on the pilot control valve 5400 and closes it again. Now, the working space 1400 is closed again and through the incoming air via the channel 1500 compressed air can build up working pressure again.

The use of the pilot control valve 5400, which is axially aligned in a row with both the pneumatic piston 1300 and the hydraulic piston 1800, provides reliable, high lift and hence high power control.

The system operates as a hydraulic pump, that is, the pneumatic piston 1300 and thus the hydraulic piston 1800 is oscillated. Consequently, hydraulic fluid can be continuously conveyed and a small working volume of the hydraulic piston 1800 is sufficient to be able to provide a sufficient amount of hydraulic fluid.

In order to work as a pump, the hydraulic region has a pressure valve 5900 and a suction valve 1900, via which a fluid delivery only in the direction of the hydraulic valve 900, to which the pulling or pressing device is connected, is possible. The design of pressure valve 5900, which opens at each pumping operation in which the piston is moved to the left, and of suction valve 1900, which flows when resetting the piston hydraulic fluid in the working space of the hydraulic piston is known in the art and requires no further explanation.

The hydraulic valve 900 consists of a sleeve 900a and a plug 900b, which closes the valve by means of spring force when the pulling or pressing device is not connected.

The hydraulic valve 900 is part of the quick coupling 800, which is connected to the hydraulic area 2000 by means of a fitting 5700 comprising seals.

The quick coupling 800 can be loosened by turning and locked in the attached state via the locking lever 2300 to ensure that the clutch is not inadvertently loosened under applied pressure.

The housing 4700 of the quick coupling 800 is preferably screwed to the housing of the pressure generator or to the front housing part.

Further, the pressure generator comprises a relief valve 2100. It is in this embodiment, a three-two-way valve. The relief valve 2100 is in the ground state with applied compressed air through the channel 2200 open. For this purpose, the compressed air flows through the channel 2200 in a working space and presses the discharge piston 6000 down.

Since now the hydraulic fluid from the hydraulic range 2000 continuously flows back, no pressure can build up.

With actuation of the actuator 200, the channel 2200 is closed and the relief valve 2100 closed due to spring preload. Consequently, pressure in the hydraulic area 2000 can build up.

When the operator releases the actuating device 200, compressed air flows through the channel 2200 and opens the relief valve 2100, so that the hydraulic region is depressurized immediately after releasing the actuating device 200.

In this embodiment, a safety actuator 700 is still provided, which is arranged as an eccentric above the discharge piston 6000.

A pressure build-up is possible only in the position of the safety actuator 700 shown here, since when moving the safety actuator of the eccentric keeps the relief piston 6000 in the open position, thus preventing a closing of the relief valve 2100.

The safety actuating device 700 may be designed such that it can be used, for example, by means of a spring automatically moves to an open position of the relief valve. Before each new actuation of the actuator 200 then the safety actuator 700 must be put back into the position shown here, in which it first remains, as it is determined due to the spring bias of the relief valve 2100. Upon actuation of the actuator, the safety actuator 700 returns to the inactive position.

Depending on the embodiment variant, a two-hand operation can also be provided via the safety actuating device 700, in which case it must be operated continuously in order to build up pressure at all (not shown).

Fig. 14 shows a handle 80, with an alternative embodiment of the invention will be explained in more detail.

The handle 80 includes a quick coupling 81, to which in Figs Fig. 1 to Fig. 10 described riveting device can be connected.

The handle 80 further includes an actuator 82 for triggering the riveting operation.

In contrast to the embodiments described above, the pressure generator is operated stationary in this embodiment.

For this purpose, the handle 80 comprises a hydraulic connection 83 which communicates with the hydraulic region of the pressure generator is connected, and pneumatic control lines 84 and 85, via which the pressure generator is controlled.

This embodiment of the invention has the advantage that the handle is still much smaller and lighter than the pressure generator and thus the accessibility can be further improved. On the other hand, in comparison to the direct coupling with the pressure generator, it is disadvantageous that the pressure generator must be carried as a stationary unit located nearby and the range of action is not comparable, as if the device merely has to be connected to a compressed air connection.

By the invention, a riveting tool could be provided, which allows a high tensile force and in which the accessibility of hard to reach areas in the body area is significantly improved.

LIST OF REFERENCE NUMBERS

• 1 riveting tool
• 2 head piece
• 3 carriers
• 4 receiving device
• 5 swivel bearings
• 6 quick coupling
• 7 claws
• 8 sleeve
• 9 pistons
• 10 working space
• 11 spring
• 12 channel
• 13 containers
• 14 rotary feedthrough
• 15 channel
• 16 valve
• 17 sleeve
• 18 spring
• 19 housing
• 20 pen
• 21 connection piece
• 22 locking
• 23 recess
• 24 engagement element
• 25 actuator
• 26 channel
• 27 channel
• 28 channel
• 29 spring
• 30 groove
• 80 handle
• 81 quick coupling
• 82 operating handle
• 83 Hydraulic connection
• 84 pneumatic control line
• 85 Pneumatic control line
• 100 pressure generators
• 200 actuator
• 300 pressure regulator
• 400 handle
• 500 housings
• 600 compressed air connection
• 700 safety actuator
• 800 quick coupling
• 900 hydraulic valve
• 900a sleeve
• 900b stopper
• 1000 screw
• 1100 pen
• 1200 switching valve
• 1300 pneumatic pistons
• 1400 working space
• 1500 channel
• 1600 channel
• 1700 spring
• 1800 hydraulic piston
• 1900 Suction valve
• 2000 hydraulic area
• 2100 relief valve
• 2200 channel
• 2300 locking lever
• 4700 housing
• 5400 pilot control valve
• 5800 exhaust air chamber
• 5900 pressure valve
• 6000 discharge pistons
• 6100 flow control valve
• 6200 control bore
• 6300 valve seat
• 6400 pistons
• 6500 channel
• 6600 pistons

Claims (7)

1. A blind riveting device (1) with a hydraulically operated pulling means, comprising:

   (i) a head piece (2) comprising a hydraulically operated piston (9) and a receiving means (4) for a rivet;

   (ii) a holder and a pivot joint with a rotary passage (14) for hydraulic fluid, through which the head piece (2) is pivotable about the holder by at least an angle of 45°;

   characterized in that:

   the holder (3) is connected to a pressure generator (100) via a quick coupling (6) which has a fluid passage for hydraulic fluid and a self-closing valve for a hydraulic fluid passage.
2. The blind riveting device according to claim 1, characterized in that the blind riveting device (1) is configured as a hand-held riveting device.
3. The blind riveting device according to any one of the preceding claims, characterized in that the head piece (2) is pivotable about the holder by at least an angle of 90°.
4. The blind riveting device according to any one of the preceding claims, characterized in that the blind riveting device comprises a pivot joint with a detent mechanism (22).
5. The blind riveting device according to any one of the preceding claims, characterized in that the pressure generator (100) to which the carrier can be connected has a self-closing valve (16) for a hydraulic fluid passage.
6. The blind riveting device according to any one of the preceding claims, characterized in that the blind riveting device is connected to a pressure generator (100) which comprises a pneumatic piston (1300) through which a hydraulic piston (1800) for generating the hydraulic pressure is moved.
7. The blind riveting device according to the preceding claim, characterized in that the pressure generator (100) is configured as a hydraulic pump.

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