WO2012025522A2

WO2012025522A2 - Rivet setting device

Info

Publication number: WO2012025522A2
Application number: PCT/EP2011/064463
Authority: WO
Inventors: Fabio Luongo
Original assignee: Adolf Würth GmbH & Co. KG; Würth International Ag
Priority date: 2010-08-24
Filing date: 2011-08-23
Publication date: 2012-03-01
Also published as: WO2012025522A3; DE102010039664A1; EP2608908A2

Abstract

The invention relates to a rivet setting device for setting a blind rivet (3) containing a plurality of clamping plates (10) having flat boundary surfaces for acting on the mandrel (2) of the blind rivet (3). Said clamping plates (10) are disposed and guided in slots (7) of a mounting (5). The mounting (5) contains a cylindrical passage for the rivet mandrel (2). The slots (7) extend in the longitudinal direction of the passage and radially. The width of the slots is less than the diameter of the passage for the rivet mandrel. The clamping plates (10) can be moved radially in the slots (7) to such an extent that the inner edges of said plates facing the passage can engage in the passage.

Description

description

rivet setting

The invention is based on a Nietsetzgerät, with the help of a blind rivet can be set.

Blind rivets are those rivets that are inserted and deformed from the front without access to the back of the location where the rivet is placed. The deformation of the blind rivet to form a rivet head on the back or in a solid material is done by means of a rivet mandrel, which is pulled on. It can be done using manually operated pliers or by using powered riveting tools. After setting the blind rivet, the rivet pin ruptures.

There are also rivet setting tools that drive the rivet by thrusting the rivet mandrel into the material to be fastened, before deforming the rivet to form a rivet head by accessing the rivet mandrel.

A blind riveting tool 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 inwards.

Clamping jaws for engaging cylindrical objects are known. They are moved axially and also moved inwards due to inclined surfaces. Usually there are at least two such jaws which, when moved inward, reduce the spaces between each other. In order to first drive in a rivet by pushing attack on the rivet mandrel, clamping jaws have to be moved outwards in order to release the rivet mandrel. to admit. The jaws are not guided in their the rivet mandrel releasing state in the circumferential direction and form free spaces between them. The inventor of the present invention has found that such enlargements of slots between jaws can occur and that the rivet mandrel may buckle into such a slot during the setting process. This leads to a complete blockage of the device.

The object of the invention is to provide a rivet setting device which operates reliably even after long use and under difficult conditions.

To solve this problem, the invention proposes a Nietsetzgerät with the features mentioned in claim 1. Further developments of the invention are the subject of dependent claims.

The rivet setting device proposed by the invention thus has a holder with a central cylindrical passage for the rivet mandrel. Clamping plates are guided in a radially displaceable manner in the holder in slots extending in the radial direction and in the longitudinal direction of the passage. The clamping plates are thereby secured in the circumferential direction against dodging. Their inner sides facing the passage are designed to engage the rivet mandrel. The holder contains at least two clamping plates. Preferably, it contains three or four clamping plates, which are in particular identical.

It has proven to be sensible that the clamping plates are distributed uniformly in the circumferential direction.

In development of the invention can be provided that the holder is made of solid material with slots formed therein. In which Material can be metal, so that the holder can be produced as an injection molded part.

The bracket may also have a reduced wall thickness to save material and weight.

In a further development of the invention it can be provided that the slots are open at the end of the holder facing away from the front side of the rivet setting device. The front side of the rivet setting device is to be understood as that side from which the rivet mandrel is inserted into the device and which faces the setting site when the rivet is set.

The open end of the slots facilitates the assembly of the clamping plates and the possibly required attack on the back of the clamping plates.

In a further development of the invention it can be provided that the clamping plates have a preferably arranged in the region of the front of the rivet setting device end remote engagement surface for Beauf- tion opposite to the pulling direction of the rivet mandrel. This is to ensure that, when just no setting operation is performed, the clamping plates can be moved to the outside to release the passage through the holder. According to the invention, the rivet setting device can have a spring loading in order to move the clamping plates radially outward. This spring action, for example, attack plates on the just mentioned attack surfaces of the clamping. To move the clamping plates radially inwardly to bring them into engagement with a rivet mandrel, the pulling device is provided. This must first bring the clamping plates into engagement with a rivet mandrel and then move the rivet mandrel using the clamping plates. For the radial movement, the clamping plates in the invention may have an attack surface, which is formed for example as an inclined surface. In a further development of the invention can be provided that the clamping plates protrude at the front of the Nietsetzgeräts remote from the back of the holder from this. In this case, the engagement for displacing the clamping plates radially outwards can be made particularly simple, for example by a bridge closer.

In a further development, it can be provided that the leading edge and / or the trailing edge of the clamping plates run obliquely with respect to a perpendicular to the longitudinal axis of the passage.

The previously mentioned inclined surface for acting on the clamping plates inwardly may be formed, for example, on the radial outer side of the clamping plates. For a particularly simple construction of the device can be provided that the clamping plates protrude on its radial outer side of the holder.

In a further development of the invention can be provided that the width of the slots in which the clamping plates are guided, is smaller than the diameter of the passage for the rivet mandrel. In particular, the width of the slots and thus the thickness of the clamping plates may be between about 35% and about 60% of the diameter of the passageway for the rivet mandrel.

However, it is also possible, in particular when the rivet mandrel is likewise guided on the end of the holder remote from the front side of the rivet setting device, that the width of the slots is greater than or equal to is formed of the diameter of the passage.

According to the invention, it can be provided according to a further feature that the radial inner sides of the clamping plates, which are intended for engagement on the outer side of the rivet mandrel, have a longitudinal profiling with which they can engage the rivet mandrel optionally having a similar profiling. This allows a positive connection between the attacking clamping plates and the rivet mandrel.

It may also be provided that extend in the transverse direction in the radial inner side in the clamping plates curved, in particular in a curvature of the mandrel adapted form. The invention also proposes a holder with at least two, preferably three or four, in particular uniformly distributed over the circumference clamping plates for a Nietsetzgerät ago, as described herein. The invention further proposes clamping plates for holding a rivet setting device, as described herein.

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:

1 shows a simplified cross section through the front end of a rivet setting device according to the invention;

FIG. 2 shows in perspective the holder arranged in the rivet setting device; FIG. 3 simplifies a rear view of the holder in FIG. 2;

FIG. 4 shows a simplified representation of a modified embodiment corresponding to FIG.

The Nietsetzgerät shown in Figure 1 according to the invention contains a multi-part housing 1. At the front end of Nietsetzgeräts, left in Figure 1, an opening is present through which the rivet mandrel 2 of a blind rivet 3 is passed. In the housing, a holder 5 is disposed immediately behind the opening for the mandrel 2. This holder 5 has a passage 4, through which the mandrel 2 protrudes. The passage 4 corresponds in its cross-section about the size of the mandrel. 2

The holder 5 for the mandrel 2 has in the embodiment shown here and described three slots 7, see the figure 3. In the upper half of Figure 1, the section through a slot 7 is passed through. The front end wall 8 of such a slot 7 extends obliquely with respect to the longitudinal axis of the passage 4 for the rivet mandrel 2 of the blind rivet 3. The radially outer end of the end wall 8 is thus closer to the setting end of the rivet setting device 1 as the inner directly adjacent to the passage 4 end the front end wall 8. In each of the three slots 7 is a clamping plate 10 is used, the front edge 9 has the same slope as the front wall 8 of the associated slot 7. The clamping plate has a radially inwardly parallel to the passage 4 extending inside. 1 1, which is slightly ribbed. On its opposite outer side, the clamping plate 10 has an inclined surface 12, with which it rests flat against the inner side 13 of a clamping sleeve 14. The inner side 13 has a funnel shape opening to the right. In the housing 1, a jaw closer 15 is arranged, which is acted upon by means of a compression spring, not shown, to the left, ie in the direction of the setting end of Nietsetzgeräts. By the compression spring of the jaw closer 15 is pressed in the direction of the trailing edge 16 of the clamping plates 10. The rear edge 16 of the clamping plates 10 associated front of the jaws 15 has an inclined surface 17, the slope corresponds to the oblique course of the trailing edge 16 of the clamping plates 10. The leading edge 9 and the trailing edge 16 of the clamping plate 10 thus diverge from each other.

Figure 2, to which reference is now made, shows the holder 5 in a perspective view. From the lateral surface 18 of the holder 5, the three clamping plates 10 protrude. As a result, the inclined surfaces 12 are outside the holder 5, so that they are available for moving the clamping plates 10. As can be seen from the perspective view as well as the section of FIG. 1, the clamping plates 10 protrude from the rear side on the rear side 19 of the holder 5 facing away from the front side of the rivet setting device. The slots 7 (FIG. 3) are thus open to the rear side 19 of the holder 5.

The slots 7 are distributed uniformly in the circumferential direction, they extend on the one hand radially rectilinear and on the other hand in the longitudinal direction parallel to the passage 4. In each slot 7 with a narrow but still existing fit a clamping plate 10 is inserted, which protrude relative to the lateral surface 18 of the holder 5. The width of the slots 7 and thus the thickness of the clamping plates 10 is smaller than the diameter of the passage 4. The clamping plates 10 are radially displaceable in the slots 7, and due to the inclined surfaces 8 to some extent also axially. In the circumferential direction, however, the clamping plates 10 are immovably supported and guided. For the operation of the arrangement, reference is again made to FIG. The jaw closer 15, acted upon by a mentioned compression spring, engages in the axial direction at the trailing edge 16 of the clamping plates 10 and acts on these in the axial direction to the left. Due to the oblique course of the front wall 8 of the slot 7 and the oblique course of the trailing edge 16 and the front inclined surface 17 of the jaw closure 15, this action causes the clamping plate 10 is displaced outwards until it rests against the inside of the clamping sleeve 14. This is the position of the clamping plates 10 shown in FIG. 1. When a rivet mandrel 2 is inserted, it is necessary to pull on the rivet mandrel 2 in order to set the blind rivet 3. This access handle via the clamping sleeve 14, which is pulled to the right. It displaces the clamping plate 10 radially inwards until it engages with its inner edge 11 on the rivet mandrel 2. In a further displacement of the clamping sleeve 14, the clamping plate 10 can no longer dodge radially inward, so that it is then moved together with the rivet mandrel 2 only axially, in Figure 1 to the right. This is done pulling on the rivet pin 2. This happens until the rivet mandrel 2 ruptures at a predetermined breaking point, not shown. Then the traction device is switched off. The setting process is finished. The jaw closer 15 now pushes the clamping plates 10 in the direction of the front end of the holder 5 with the aid of the already mentioned compression spring, ie, to the left in FIG. In this case, the clamping plates 10 slide due to the oblique course of the two co-operating inclined surfaces 8, 9 to the outside. The clamping sleeve is again moved to the position shown in Figure 1. As a result, the mandrel 2 is released. He can now be removed from the holder 5.

The clamping sleeve 14, together with a drive, not shown, the pulling device. In the figure 4, the holder 5 is slightly different than in the embodiment of Figure 1. At the front end of the setting device facing away from the inner end of the holder 5 'of the mandrel 2 is also performed. The slots 7, in which the clamping plates 10 are guided, so are open only to the rear side 19 in their radially outer region. They must be open there so that the jaw closure 15 shown in FIG. 1 can engage the rear end edges of the clamping plates 10. In such an embodiment, as shown in Figure 4, the width of the slots 7 and thus the thickness of the clamping plates 10 may also be as large as the diameter of the passage 4 for the mandrel 2 or even larger. In this case, the holder on two clamping plates 10, which are arranged opposite to each other. The holder 5 'is extended axially inwards, except in the region of the slots.

The inner side 1 1 of the clamping plates 10 may be profiled, in particular congruent to a profiling formed on the mandrel 2, which is not shown in the figures for reasons of simplicity. A rivet setting device for setting a blind rivet contains a plurality of clamping plates with flat boundary surfaces for engagement with the rivet mandrel of the blind rivet. These clamping plates are arranged and guided in slots of a holder. The holder contains a cylindrical passage for the rivet mandrel. The slots extend in the longitudinal direction of the passage and radially. Its width may be smaller than the diameter of the passageway for the rivet mandrel. The clamping plates can be moved radially in the slots to the extent that their inner edges facing the passage engage in the passage and can thus engage a rivet mandrel arranged in the passage.

Claims

claims

1. rivet setting device, with

1.1 of a central cylindrical passage (4) for the rivet mandrel (2) of a rivet to be set (3) having holder (5), the

1.2 at least two radially and in the longitudinal direction of the passage (4) extending slots (7),

1.3 in each of which a clamping plate (10) is guided radially displaceable, the

1.4 is formed on its radial inner side (1 1) for engagement on the rivet mandrel (2), and with

1.5 a for access to the in the holder (5) arranged rivet mandrel (2) of the rivet (3) formed pulling device, the

1.6 when actuated, the clamping plates (10) radially to attack on the rivet mandrel (2) shifts.

2. rivet setting device according to claim 1, wherein the holder (5) consists of a solid material with slots (7), in particular a metal.

3. rivet setting device according to claim 2, wherein the slots (7) on the front of the Nietsetzgeräts remote from the end (19) of the holder (5) are open.

4. rivet setting device according to one of the preceding claims, wherein the wall thickness of the holder (5) in the region between the slots (7) relative to the region of the slots (7) is reduced.

5. rivet setting device according to one of the preceding claims, wherein the clamping plates (10) have a preferably arranged in the region of the front of the rivet setting end remote engagement surface (16) for applying force opposite to the attack on the rivet mandrel (2).

6. rivet setting device according to one of the preceding claims, wherein the clamping plates (10) have an engagement surface (12) for their application by the pulling device in the radial direction inwards.

7. rivet setting device according to one of claims 3 - 6, wherein the clamping plates (10) on the front side of the Nietsetzgeräts remote rear side (19) of the holder (5) protrude from this.

8. rivet setting device according to one of the preceding claims, wherein the front edge (9) and / or the trailing edge (16) of the clamping plates (10) obliquely with respect to a perpendicular to the longitudinal axis of the passage (4).

9. rivet setting device according to one of the preceding claims, wherein the clamping plates (10) on its radial outer side an inclined surface (12) on which the pulling means for moving the clamping plates (10) engages, in particular by means of a clamping sleeve (14).

10. rivet setting device according to one of the preceding claims, with a spring action for releasing the passage (4) through the holder (5) in non-actuated pulling device.

1 riveter according to one of the preceding claims, wherein the width of the slots (7) is smaller than the diameter of the passage (4).

12. rivet setting device according to one of the preceding claims, wherein the radial inner sides (1 1) of the clamping plates (10) a Have longitudinal profiling for access to the rivet mandrel (2), which is particularly adapted to a profiling of the mandrel (2) for positive engagement.

13. rivet setting device according to any one of the preceding claims, wherein the radial inner side (1 1) of the clamping plates (10) are bent, in particular in a to the curvature of the mandrel (2) adapted form.

14. Holder with at least two clamping plates (10) for a Nietsetzgerät according to any one of the preceding claims.

15. clamping plate for a holder (5) for a rivet setting device according to one of claims 1 to 13.