EP2608907B1 - Blind rivet setting device - Google Patents

Description

The invention is based on a blind riveting tool with the aid of which access rivet is used to set the blind rivet on a rivet mandrel of a blind rivet.

Blind rivets are rivets that are inserted and deformed from the front without access to the back of the location where the rivet is set. The deformation of the blind rivet to form a closing head on the back is done by means of a rivet mandrel, which is pulled on. This can be done using manually operated pliers or powered rivet setters. When setting the blind rivet the rivet mandrel breaks at a predetermined breaking point.

A blind rivet setting device is already known in which an electric motor drives a pulling device which pulls on the rivet mandrel of a blind rivet held in the device. For pulling on the blind rivet, a collet is provided, which has an inner cone and thereby acts on clamping jaws inwardly against the rivet mandrel. The collet surrounds a pipe. Once the rivet mandrel has been torn off, the user can tilt the device upwards, causing the riveted mandrel to slide down the tube due to gravity and being caught in a container ( DE 4126602 ).

Furthermore, a rivet setting device with a drive for a pulling device is known which pulls on the rivet mandrel of a rivet arranged in a holder of the device. The pulling device has a compression spring ( US 3,095,106 A on which the preamble of claims 1 and 13 is based).

The invention is based on the object to provide a Blindnietsetzgerät that allows automatic removal of the mandrel without further intervention of the user.

To solve this problem, the invention proposes a Blindnietsetzgerät with the features mentioned in claim 1 and a method for setting a rivet before. Further developments of the invention are the subject of dependent claims.

The Nietsetzgerät according to the invention includes a pulling device which is operated by hand or by a motor drive so that it pulls on the rivet mandrel. During the construction of the tensile force, a compression spring is tensioned. When the rivet mandrel is torn off at the intended breaking point, the spring relaxes jerkily, which leads to a stop of a part of the pulling device against a stop, as a result of which the part of the pulling device acting on the rivet mandrel is jerkily stopped. The rivet mandrel itself is released, so that it retains its movement and is thrown through the pulling device. It can then either be moved out of the device or moved into a container contained in the device.

The engaging on the rivet mandrel part of the pulling device is thus biased when setting the rivet against a resilient element that releases its energy stored in setting again when the rivet mandrel breaks to move this part of the pulling device and the rivet mandrel in the pulling direction. Depending on where the spring-elastic element attacks, this may be a tension spring or a compression spring. Also rubber bands or a resilient plastic block are conceivable.

In this way, after setting the rivet by the device, the rivet mandrel itself can be removed from the holder and discarded without the user having to take care of this process himself.

According to the invention may be provided in a development that the drawbar a central, axially extending tube around which the individual components of the pulling device are arranged. The tube forms a passage for the torn mandrel. In this way, it is ensured that in the path of the torn-off rivet pin no transition points, gaps or protrusions are present, where the rivet mandrel could hang in its movement.

To hold on to the rivet mandrel to set the blind rivet, according to the invention in training the drawbar in the region of its front, the holder for the blind rivet to be set associated end have a clamping sleeve which acts upon clamping jaws radially against the rivet mandrel.

For this purpose, the clamping sleeve in the region of its front end have a widening in the pulling direction inner cone, with which it bears against the outside of the clamping jaws.

In order to create the clamping jaws with certainty by the clamping sleeve to the rivet mandrel, according to the invention may be provided in a further development, a compression spring which acts on the clamping jaws in the axial direction toward the holder for the blind rivet associated end of the pulling device.

In particular, it can be provided in a development that the compression spring is not applied directly to the clamping jaws, but on a jaw closure, which in turn rests against the clamping jaws. The jaw closure may be a sleeve.

The combination of compression spring and jaw closure energizes the jaws in a direction to be moved radially inwardly by the collet when the collet is pulled by the puller. In a further development of the invention can now be provided that the clamping jaws and the jaw closer are coordinated so that the jaws experienced by the jaw closer and a radial admission to the outside. This not only serves to ensure that the clamping jaws are in contact with the clamping sleeve, but also to release the clamping jaws from the rivet mandrel when it has been torn off. Because when reaching the stopper, the jaw closure then ensures that the jaws release from the rivet mandrel so that it continues its movement completely uninfluenced.

The vote of jaws and jaw closer, for example, be done so that the clamping jaws associated end face of the jaw closer has a cone which acts on a correspondingly shaped counter surface of the clamping jaws radially acted upon.

In order to achieve a high spring force and thus a high acceleration on a short way and thus also in a small footprint, can be provided in a further development of the invention that the compressed at the access handle on the drawbar spring-elastic element is designed as a plate spring, in particular as a plate spring package.

In order to create a maintenance-free even with long-term use device, according to the invention may be provided in a further development that the plate spring or the package of disc springs is housed in a separate housing that surrounds the plate spring on all sides.

The drive for the traction device can be, for example, an electric motor which engages with the aid of a gear on the traction device, in particular a spindle.

Since the invention provides a Nietsetzgerät, in which the removal of the demolished rivet mandrel takes place automatically without intervention of the user, can be provided in a further development of the invention that the device also has a container for these torn rivet mandrels, in which the rivet mandrels are collected a variety of set blind rivets.

Since the rivet mandrels are moved after being torn off at their predetermined breaking point by the pipe contained in the pulling device, the invention proposes in a further development to arrange a device in the riveting tool with which a torn-off rivet mandrel can be guided out of the pipe into the rivet mandrel container.

This device may, for example, be that a deflector is moved behind the rear end of the tube.

Another way to implement this device is that the rivet mandrel container is moved into the path of the rivet mandrel conveyed out of the tube, either by pivoting or by a parallel displacement. It is also possible a combination of both movements.

In order to create space for the rivet mandrel container during insertion of the rivet mandrel, it can be provided according to the invention that the drive is moved out of the position behind the pipe, wherein a pivoting movement or a parallel displacement or a combination of both possibilities can also be provided here.

Figur 1

einen schematischen Schnitt durch den Bereich eines Nietsetzgeräts nach der Erfindung;

Figur 2

den gleichen Schnitt in verkleinertem Maßstab;

Figur 3

den gleichen Schnitt nach dem Spannen der Feder;

Figur 4

den Schnitt nach einem weiteren Betätigen der Zugeinrichtung;

Figur 5

den Schnitt nach dem Entspannen der Feder;

Figur 6

den Schnitt nach dem Lösen des Nietdorns;

Figur 7

den Schnitt nach Wiederherstellung des Ausgangszustands;

Figur 8

einen stark vereinfachten Schnitt durch ein Nietsetzgerät;

Figur 9

den Schnitt der Figur 8 in einem anderen Zustand;

Figur 10

den Schnitt durch ein Nietsetzgerät einer anderen Ausführungsform.

Further features, details and advantages of the invention will become apparent from the claims and the abstract, the wording of which is incorporated by reference into the content of the description, the following description of preferred embodiments of the invention and with reference to the drawing. Hereby show:

FIG. 1

a schematic section through the area of a rivet setting device according to the invention;

FIG. 2

the same cut on a smaller scale;

FIG. 3

the same cut after tensioning the spring;

FIG. 4

the section after a further actuation of the pulling device;

FIG. 5

the cut after relaxing the spring;

FIG. 6

the cut after loosening the rivet mandrel;

FIG. 7

the cut after restoration of the initial state;

FIG. 8

a greatly simplified section through a rivet setting;

FIG. 9

the cut of the FIG. 8 in another state;

FIG. 10

the section through a rivet setting device of another embodiment.

FIG. 1 schematically shows a front end of a rivet setting device according to the invention. In the front end, a holder 2 for a blind rivet 1 is arranged. The blind rivet 1 has a rivet mandrel 7. The sleeve of the blind rivet 1 rests against the outside of the holder 2, while the rivet pin 7 extends into the interior of the holder 2.

In the housing, a pulling device 4 is arranged, which consists of several parts. The pulling device 4 acts on a clamping sleeve 5, which is guided axially displaceably in the front end of the Nietsetzgeräts in a surrounding holder. The maximum movement after in front, that is in FIG. 1 to the left, is determined by conditioning the end face of the clamping sleeve 5 on an inner shoulder. The front end of the clamping sleeve 5 has on the inside a conical surface 6, the cone of which, starting from the front end of the setting tool in the direction of the rear end, right in FIG. 1 , expanded. On this conical surface 6 are clamping jaws 8, which are formed as individual elements and arranged around the mandrel 7 around.

Centrally traction device 4 is penetrated by a tube 9, thereby forming a smooth uninterrupted passage 10. The tube 9 has an inner diameter forming the passage 10, which is larger than the diameter of the rivet mandrel 7 of a blind rivet 1 to be set.

The clamping jaws 8 are acted upon in the direction of the front end of the Nietsetzgeräts by a jaw closer 11, which is designed as a sleeve. The end face of the jaw closer 11, which rests against the back of the clamping jaws 8, is slightly conical, as well as the jaw closure 11 facing end face of the clamping jaws 8. The jaw closer 11 is in turn acted upon by a compression spring 12 which is disposed around the tube 10 around and is supported on another component.

In the clamping sleeve 5, an intermediate element 13 is fixed, in this case screwed, which has an outwardly directed flange 14 at its, the front end of the Nietsetzgeräts remote end. This flat end surface having a flange 14 of the intermediate member 13 abuts against an end face of a counter-element 15 of the pulling device 4, which in turn is bolted to the spindle 16 to be seen right.

The screwed to the spindle 16 counter-element 15 has on the outside of its flange 17 has a thread on which a housing 18th is screwed on. Inside the housing 18, a compression spring 19 is arranged, which generates a compressive force between the inside of the housing 18 connected to the counter element 15 and the flange 14 connected to the clamping sleeve 5. The trained as a plate spring assembly spring 19 thus presses the flange 14 of the intermediate member 13 against the flange 17 of the counter element 15. At the intermediate element 13 is also supported by the compression spring 12, which presses the jaw closure member 11 with its conical surface against the clamping jaws 8.

The holder for the blind rivet 1 has a stop surface on which the front end face of the clamping jaws 8 comes into abutment. When the clamping jaws 8 bear against this end face, the clamping jaws 8 have an inner spacing from each other which is greater than the diameter of the rivet mandrel 1.

When a rivet mandrel 1 is inserted into the device, the rivet mandrel 1 enters the in FIG. 1 shown position, on a smaller scale also in FIG. 2 is shown. This is the starting position to set a blind rivet by access rivet on the rivet mandrel 1. Starting from the position shown now the tension spindle 16 and thus the pulling device 4 by a drive, not shown (in the present case an electric motor - alternatively, for example, by hand) operated. The clamping sleeve 5 is in the FIGS. 2 to 7 moved to the right. Since the compression spring 19 is designed strong, first the clamping sleeve 5 is moved in parallel with the spindle 16. The conical surface 6 on the inside of the clamping sleeve 5 engages on the outside of the clamping jaws 8 and moves them inwardly into engagement with the rivet mandrel 7. Upon further actuation of the pulling device is now, since the rivet mandrel 7 makes a resistance, first the spring 19th curious until she lies on block. This is in FIG. 3 shown.

A further movement of the spindle 16 then leads to a concurrent further movement of the clamping sleeve 5 and thus of the mandrel 7, the then in this way forms the rivet head (closing head). This progression is in FIG. 4 shown.

Once the pulling force is high enough, the mandrel breaks at the breaking point, see FIG. 5 , This causes the compression spring 19 relaxes. While in the block deformed spring 19 between the flange 14 and the flange 17 a distance was created, see FIG. 3 and FIG. 4 , is now removed by relaxing the spring 19, this distance abruptly. The intermediate element 13 abuts with the flange 14 on the flange 17. The clamping sleeve 5 can now no longer be moved, but the remaining momentum of the clamping jaws 8 and the mandrel 7 contained in them causes these parts to move further in the pulling direction. During this further movement, the spring 12 surrounding the tube 9 is tensioned, see FIG. 6 thus pressing the jaw closer 11 against the clamping jaws 8 and moving them outwards, so that they release the torn-off rivet mandrel 7. The rivet mandrel is thrown through the passage 10 of the tube 9, while the jaws 8 are moved back to their original position, in which now a new blind rivet can be used, as the FIG. 7 shows.

FIG. 8 shows simplified the housing 20 of the rivet setting device. Left is the front end of Nietsetzgeräts, the holder 2 is shown simplified for a rivet mandrel. In the housing, an unspecified explained drive 21 is arranged to shoot a rivet. This is not shown in detail. To trigger the drive 21 and thus to set a blind rivet is a switch which is actuated by a push button 22. In the handle 23, a battery or a battery can be accommodated.

In the housing 20, a container 24 for torn rivet mandrels 7 is also housed. So that the device does not become too large, this container 24 is arranged below the drives 4, 21 and not at the rear End of the device. In order to convey the torn-off rivet mandrels 7 ejected through the tube 9 into the container 24, it is provided in a first embodiment that the entire drive 21 can be pivoted about a pivot point mounted between its ends. In this case, the rivet mandrel container connected to the drive 21 is also pivoted. A curved channel 25, which leads into the mandrel container 24, is also pivoted so that it is aligned with the end of the tube 9. This pivoting of the drive 21 and the mandrel container 24 is controlled so that when the mandrel 7 is torn off, the channel 25 in FIG. 9 has shown position.

While at the in FIG. 8 and FIG. 9 illustrated embodiment, the drive 21 is pivoted, shows the FIG. 10 an embodiment in which the entire drive 21 is moved together with the Nietdornbehälter 24 in parallel. Also in this case, in the state in which the torn rivet mandrel is thrown through the pipe 9, the channel 25 is arranged with its inlet end in the axial extension of the pipe 9.

Of course, it would also be conceivable to displace the drive 21 axially, thereby forming a larger gap between the tube 9 and the drive 21, and a deflector, for example, similar to a channel 25, to insert into this gap, the mandrel into the Nietdornbehälter 24 distracts.

A device for setting rivets is proposed, which has a motor-driven pulling device for pulling on the rivet mandrel. The traction device includes a plate spring, which is initially stretched when operating the traction device. Once the force exerted by the pulling device on the rivet mandrel force is sufficiently large, so that the rivet mandrel breaks off as intended at the predetermined breaking point, the preloaded spring relaxes abruptly and causes the on the Rivet attacking part of the drawbar strikes against a stop. As a result, this part of the traction device then jerks while the rivet mandrel is thrown further. In this way it becomes possible to transport the rivet mandrel into a mandrel container contained in the housing without a user having to initiate a special procedure for this purpose.

The Nietsetzgeräte described so far have a drive 21 to shoot the rivet in, for example, two sheets, and a drive 4 to pull on the rivet mandrel and to form a closing head. In a rivet setting device of this type, first the drive 21 must be arranged axially to the holder in order to shoot the rivet axially, and then either the drive must be moved out of this axis, for example translationally or rotationally to make room for the channel 25, or a deflection device, for example a channel 25, must be moved into this axis in order to guide the mandrel, which is moved in the drawing direction, into the mandrel container.

In a variant to the riveting of the FIG. 8 and 10 lacks the drive 21, so that a riveting is created, with the rivet can only be set, that is, can only be pulled on the rivet. Then, a channel 25 may be stationarily arranged in the pulling direction behind the pulling device 4 in order to guide the torn-off rivet mandrels into a rivet mandrel container.

Claims (16)

1. Riveting tool with

   1.1 a housing (20),

   1.2 a holder (2) arranged in the housing (20) for a rivet (1) to be set,

   1.3 arranged in the housing (20), a tensioning device (4) for applying tension to a rivet mandrel (7) of the rivet (1) arranged in the holder (2),

   1.4 an actuator for the tensioning device (4) as well as with

   1.5 a resilient element (19) contacting the tensioning device (4), characterised in that the resilient element (19) is arranged in such a way that when tension is applied it is elastically deformed, more particularly compressed and

   1.6 relaxes on tearing off of the rivet mandrel (7), in order to move a part of the tensioning device (4) with the rivet mandrel (7) in the direction of tensioning.
2. Riveting tool according to claim 1 in which the tensioning device (4) surrounds a tube (9) extending in the axial direction in which the rivet mandrel (7) is guided.
3. Riveting tool according to claim 1 or 2 in which the tensioning device (4), in region of its front end facing the holder (2) for the blind rivet (1) to be set, has a clamping sleeve (5) in which during tensioning forces the clamping jaws (8) radially against the rivet mandrel (7) and/or a release mechanism (11) which radially removes the clamping jaws (8) from the rivet mandrel (7) when the rivet mandrel (7) has been torn off.
4. Riveting tool according to claim 3 in which the clamping sleeve (5) in the region of its front end has an inner cone (6) expanding in the direction of tensioning with which it is in contact with the outer side of the clamping jaws (8).
5. Riveting tool according to claim 3 or 4 in which to actuate to the clamping jaws (8) in the axial direction a compression spring (12) is provided which in particular acts on the jaw closer (11) in contact with the clamping jaws (8).
6. Riveting tool according to claim 5 in which the clamping jaws (8) and the jaw closer (11) are coordinated with regard to each other in such a way that actuation of the jaw closer (11) through the compression spring (12) not only brings about an axial actuation of the clamping jaws (8) against the clamping sleeve (5), but also a lesser actuation of the clamping jaws (8) axially outwards.
7. Riveting tool according to any one of the preceding claims in which the resilient element (19) has a disk spring, more particularly a disk spring package, which is advantageously arranged in a housing (18) surrounding it.
8. Riveting tool according to any one of the preceding claims with a rivet mandrel holder (25) arranged in the housing (20) for the torn-off rivet mandrels (7) of several set rivets.
9. Riveting tool according to claim 8 with a device for introducing a torn-off rivet mandrel (7) that is being moved through the tube (9) into the rivet mandrel holder (25).
10. Riveting tool according to any one of the preceding claims with an actuator (21) for setting the rivets, wherein the actuator (21) is arranged in such a way that it can be moved, more particularly pivoted or displaced away from the axial extension of the tube (9) extending through the tensioning device (4).
11. Riveting tool according to any one of claims 8 and to 10 in combination with claim 2 in which an inlet into the rivet mandrel holder (25) can be moved into the axial extension of the pipe (9) extending through the tensioning device (4).
12. Riveting tool according to any one of claims 8 to 11 with a deflection device for deflecting a torn-off rivet mandrel (7) that is moving through the tube (9) into the rivet mandrel holder (25), wherein the deflection device is movably arranged between the tube (9) and the actuator for the tensioning device (4).
13. Method of setting a rivet with the following steps:

    13.1 a rivet mandrel (7) of a rivet is introduced into a riveting tool,

    13.2 tension is applied to the rivet mandrel (7) by way of a tensioning device (4) of the riveting tool, characterised in that

    13.3 at the same time as the tensioning, a resilient element (19) in contact with the tensioning element (4) is compressed,

    13.4 the tensioning is continued until the rivet mandrel (7) is torn off,

    13.5 after the rivet mandrel (7) has been torn off, a part of the tensioning device (4) is moved with the torn-off rivet mandrel (7) in the tensioning direction through relaxation of the resilient element (19).
14. Method according to claim 13 in which after process step 13.5 the rivet mandrel (7) is released by the tensioning device (4).
15. Method according to claim 13 or 14 in which after the process step in claim 14 the rivet mandrel (7) is moved into a rivet mandrel holder (25).
16. Method according to any one of claims 13 - 15 in which the part of the tensioning device (4) that is moved in processing step 13.5, is slowed down after the process step of claim 15, more particularly by means of a stop.

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