DE102006007707A1 - Blind rivet for securing plates together has a central pin that is driven into body using an impact tool - Google Patents

Abstract

A blind rivet used to fix a pair of plates together has a main body having a flange [3] and a centre bore. When inserted into the hole in the plates [18,19] a captive central pin [10] is driven into the rivet body using an impact tool [20]. This causes expansion of the rivet to clamp the plates together.

Description

The The invention relates to a blind rivet, a device and a method to his seat.

Hohlniete have been known for a long time. They serve to help two elements a riveting operation to connect with each other, with access to the back is not required. For this reason, hollow rivets are suitable especially where access to the back of the two to each other too connecting elements not possible is. In the usual Hollow rivets require the elements to be connected with to provide a hole through which the rivet body is inserted. From the front side is then pulled on a rivet pin, the the rivet on the back deformed to form a rivet head.

It is already known, the tip of the thorn, on the front of the rivet stands out as a self drilling bit, so that with a corresponding device of the drilling process in one Operation can be carried out with the riveting process.

at All known blind rivets must be on a part of the blind rivet forming mandrel be pulled after setting to the actual riveting operation to effect. This relatively long thorn on which a tool for Dragging attacks, then becomes thrown away or falls uncontrolled in the area of the place where the riveting was carried out.

In addition, Hammerschlagniete are known in which a mandrel with a tip is inserted into a bore in a rivet body, which protrudes from the front side of the collar with its blunt end. Such rivets are driven in with a hammer blow. The hammer hits the protruding end of the spike. This hammer blow is not able to effect an exact division of the forces into a pure propulsive force and only then an expansion force ( US 3,691,924 ).

Of the Invention is based on the object, the possibility of blind riveting to improve so that after the riveting carried out no waste, which would have to be disposed of separately.

to solution this task strikes the invention a blind rivet with the in claim 1 and a blind rivet with the features mentioned in claim 2. Further developments of Invention are the subject of the dependent claims.

Of the Thus, the blind rivet proposed by the invention has a rivet body a collar, which forms a contact surface, with the blind rivet on the top of the one component rests. The rivet body points also a front end, for example, through the hole is inserted through in the components to be joined and on the opposite Site sufficiently protrudes. In contrast, if the blind rivet in a hole in a component is plugged, which is thicker than the front portion of the blind rivet below the contact surface of the collar, he stays in the hole without being on the opposite Side out. Furthermore, the blind rivet contains a central Attack surface, on which is attacked to deform the part of the rivet body, either on the opposite side Side of the components to be connected or arranged in a hole remains.

When the deformation causing attack comes, for example, a sudden Movement in the same direction in question in which the blind rivet in the opening was used. This is a possibility, as on the opposite Side or in the hole itself a rivet head can be formed.

A Another possibility proposed by the invention is that pulled on the attack surface becomes. In this case, so for example, a plunger or a tension element is temporarily connected to the attack surface, and it a pulling movement takes place on this type of attack surface. To the setting of the rivet head can then connect to the plunger or the tension element released again become.

In both cases you can do without a thorn previously attached to the rivet, so that afterwards no waste arises.

The central attack surface, at the attacked for deforming the front portion of the rivet body can be, for example, at the end of a hole in the rivet body be formed. The hole leads for example, as far as the thickness of the two together corresponds to joining sheets. It is also possible that this attack surface is closer to the outside the collar of the blind rivet can be arranged

It is also possible and is within the scope of the invention that the central attack surface of a narrowing of a hole is formed in the rivet body, or on a narrowing of a hole.

According to the invention may be provided in a development that the central attack surface of a plunger of a setting tool can be acted upon. The hole is thus dimensioned in this case so that such a plunger can penetrate into the hole. After preparation of the riveted joint and after the Separating the plunger then remains a hole in the front of the rivet body.

A Another possibility proposed by the invention is that in the hole inside the rivet body an expanding body is arranged, one of the central attack surface associated with this opposite End has. At this end facing away from the central attack surface of the expander then can the plunger of the setting tool attack.

Especially It makes sense that the expander in the hole not only but also set so far that he is out of the rivet body can not fall out. This can be achieved by a low clamping be achieved. Naturally the clamping should not be such that it impedes the driving-in of the expander.

In Further development of the invention can be provided that in unexpanded state of the blind rivet of Aufweitkörper off the annular attack surface the collar of the rivet body protrudes. This outstanding part can be used to attack the Serve blind rivet in a setting tool. In addition, this design can be considered Setting control can be used because after the correct setting no Survives part more, but in the most reasonable case, the end of Aufweitkörpers flush with the surface of the collar runs.

According to the invention can be provided be that the hole behind the constriction, which leads to deformation, itself as a narrow gap or otherwise continues to to facilitate the deformation of the front portion of the rivet body or to favor.

So far was described as the blind rivet formed according to the invention may be when the deformation is performed by attacking in the printing direction should. But it is, as already mentioned, also possible, the rivet head thereby form that attacked at the central attack surface in the pulling direction becomes. Here beats Now the invention before, the central attack surface for tensile attachment train a tie rod. This means similar to the admission through a pestle that the opening in the rivet body must be such that a tie rod can be used, until he reaches the central attack surface touched. Even when using a tie rod, after manufacture the rivet connection dissolved again there is the advantage that there is no waste. The tie rod, which is part of the tool can be used repeatedly so long until it is so worn out that it is no longer usable.

According to the invention can be provided be that the rivet body For example, has a non-circular cross-section or projections and at the level bottom of the collar. This should be at a Drehbeanspruchung a turning of the rivet with greater certainty be prevented.

The Invention proposes also a method of producing blind rivets a rivet body manufactured as a rivet and with a collar in the area of his one end is provided. The rivet body comes with an additional central attack surface for a Tool provided. The area of the rivet body between its front end and the central attack surface is designed such that a sudden effect on the attack surface leads to a deformation of this area. This embodiment can by providing cavities, Sollknickstellen or by a suitable material selection or Material treatment be realized.

The Invention proposes also a method for setting blind rivets, in which a provided with a front end blind rivet in each other aligned bores of two elements to be connected to the plant a bottom of his collar is pushed on the surface, whereupon subsequently through Attacking at a central attack surface the area of the rivet body between this attack surface and the front end of the rivet body is deformed to form a rivet head.

In Further development can be provided that after the onset of Blind rivet attacked by pressing on the central attack surface becomes. This attack happens jerkily.

It is also possible and is within the scope of the invention that pulling at the central attack site is attacked. The pulling can, since this is a support the front of the rivet body can be done, even slowly.

To the Pulling attack can be done so that a draw bolt until it touches the bottom of the opening of the blind rivet and connected to the bottom of the recess. Subsequently, will under support on the rivet body of Draw bolt pulled out to deform the rivet. Then the Pull bolts are released from the central attack point.

to Connection of the tie bolt with the rivet body, for example, a Cold welding method carried out become.

It is also possible and is within the scope of the invention that a resistance welding is performed.

It is also conceivable that for connecting the tie bolt with the Schussniet the draw bolt is screwed into the bottom of the recess and after the is screwed out again.

The Invention proposes also a device for setting blind rivets before. These Device contains a holder for holding a blind rivet in a certain position, a coaxial with the blind rivet arranged ram and a drive for the abrupt Advance of the ram. This Drive may preferably have means for triggering this Has feed movement. The bracket is designed so that the blind rivet opposite the plunger like that aligned is that the plunger either in the opening retract the blind rivet or on a projecting out of the blind rivet expander can attack.

When drive way for the Pestle is coming the explosive combustion of gas or propellant in question, also a gas spring with tensioning device, an oil pressure spring with tensioning device, a hydraulic piston, a pressure spring with tensioning device or compressed air.

to Generation of the bias of the feed drive can be a source of energy serve, for example, a battery, a power cable to connect a power line, compressed air or hydraulics.

In Further development of the invention can be provided that the device having a tubular body in its front region, which are also moved forward by means of a drive can. These holding bodies can serve the blind rivet itself while inserting in the holes the objects to be joined to keep. Furthermore, the device can be arranged coaxially with the feed body Having draw bolt, which is advanced by means of a drive and withdrawn can be. The device includes means for connection of the draw bolt with the bottom of a recess in the blind rivet. The device contains Furthermore, a device to the connection between the tension bolt and the blind rivet again to solve.

In In a further development of the invention, the device can Have turning device for rotating the tension bolt.

to Connection of the tie bolt with the rivet body, the device a Cold welding device exhibit. This can work so that they are the tension bolt when plant at the central attack surface of the blind rivet under pressure.

It is also possible in that the device comprises means for performing resistance welding between having the tension bolt and the blind rivet.

To the Solve the Tension bolt from the rivet body For example, the device may turn the draw bolt, so a shearing occurs between the rivet body and the draw bolt.

Especially it makes sense if the device is a magazine for holding several Blind rivets contains.

Further Features, Details and Benefits The invention results from the claims and abstract, their wording by reference to the content of the description is made, the following description of a preferred embodiment the invention and with reference to the drawing. Hereby show:

1 a partially sectioned side view of a blind rivet according to a first embodiment of the invention;

2 the cut through the rivet of the 1 before its insertion in an opening;

3 the inserted blind rivet before its expansion;

4 the condition after widening;

5 the result of the riveting process;

6 one of the 3 corresponding representation in a second embodiment;

7 one of the 4 corresponding representation in the blind rivet of 6 ;

8th greatly simplifies a setting tool for setting the blind rivets according to the invention;

9 one of the 2 corresponding representation in another blind rivet;

10 two further stages of the setting process of the blind rivet of the 9 ;

11 a schematic representation of a setting tool for the blind rivet of 9 and;

12 an axial section through a blind rivet with an external thread;

13 an axial section through a blind rivet with an internal thread.

1 shows in the left half a page view and the right half a longitudinal section through a blind rivet according to a first embodiment of the invention. The blind rivet contains a rivet body 1 , which in its central area takes the form of a pod 2 having. At the one in 1 upper end is on the rivet body 1 a collar 3 made having a flush bottom 4 having. The bottom 4 is the side from which the sleeve section emerges 2 extends. On the level bottom 4 opposite top 5 of the collar is a flat surface formed, which can serve as an annular attack surface for a tool.

On his collar 3 opposite side is the middle sleeve section 2 in a front section 6 of the rivet body in which the rivet body 1 has a gradually decreasing cross-section.

In the sleeve section 2 is a cylindrical inner opening 8th formed, which could be described as a bore, apart from the fact that this inner opening need not necessarily be drilled. But the opening has the shape of a bore, that is a circular cross-section which is constant over the length of the inner openings. At the end of the inner opening 8th is a funnel-shaped narrowing 12 present, then in a narrow slot 9 passes. The front end can connect the two parts on both sides of the slot 9 have, so that the slot 9 remains closed directly at the front end of the rivet body.

In the inner opening 8th is an expanding body 10 arranged, with a certain clamping at the edges of the inner opening 8th is applied. He is thus determined so that he can not fall out when handling the blind rivet. That in the interior of the inner opening 8th directed end 11 lies approximately at the beginning of the funnel-shaped narrowing 12 at. The opposite outer end 13 of the expander 10 protrudes clearly over the annular top 5 of the collar 3 out. It is also possible that the expander less far into the inner opening 8th is positioned in it.

2 shows the mutual association between the blind rivet and a tool 14 , which is shown greatly simplified. The blind rivet can be attached to the tool 14 be held in a manner not shown, so that it by handling the tool 14 in a hole 15 two superimposed sheets 18 . 19 can be used. The tool contains an internal bore 16 , which is dimensioned such that the sleeve-like in its front portion formed part 14a of the tool 14 on the expander 10 past the top 5 of the collar 3 can attack. In this mutual assignment, the blind rivet, as already mentioned, through the hole 15 pushed through. It creates the position as in 3 is shown. Now, in a further step, a pestle 20 through the hole 16 of the tool 14 abruptly moved forward. The pestle 20 beats with his front face 21 on the outer face 13 of the expander 10 and pushes it forward into the interior of the inner opening 8th into it. This condition is in 3 shown.

If the front end 11 of the expander 10 on the constriction 12 at the end of the inner opening 8th meets, the two or more parts of the front end 6 deformed outward of the rivet body. This is through the slot 9 allows. Because the two or more parts of the front end 6 connected at the front, the parts can not tear apart, but form a rivet head 22 like this in 4 is shown. In this state, the outer face lies 13 of the plunger 10 in the same plane as the top of the collar 3 of the rivet body. The rivet head 22 which has formed is inside through the expander body 10 strengthened. Now the tool is removed and a riveted joint has been created that looks like this 5 is shown in a side view. The expander 10 no longer protrudes from the visible top 5 of the collar 3 out. If you look at the riveted connection from the top, so also in 5 From the top, looking, one must recognize, whether this end face 13 flush with the top 5 of the collar runs. If it has penetrated too deeply into the rivet body, then one can conclude under certain circumstances that there has been too little resistance to the feed movement. This could be an indication that the connection is not strong enough. In this respect forms the Aufweitkörper 10 a setting control.

The 6 and 7 show a second embodiment of a blind rivet according to the invention. Again, the rivet body contains an outwardly directed collar 3 with a flat bottom 4 and also a flat top 5 , In the rivet body is in the sleeve area an inner opening 28 formed, which in turn is cylindrical with a constant diameter and the rounded ends. The sleeve section 2 ends in a flat face 22 parallel to the opposite top 5 of the collar 3 runs. The expansion happens here in that the front rounded end of the expander 30 the beyond the sheets 18 . 19 existing parts of the sle senabschnitts 2 displaced to the outside, as simplified in 7 is shown.

8th shows a simplified setting tool, can be set with the blind rivet according to the invention. The setting tool contains in a housing 40 a holding body 14a , in the example shown has tubular shape over its entire length. He is in the case 40 guided displaceable in the longitudinal direction. Inside the holding body 14a is the pestle 20 coaxially guided also displaceable in the longitudinal direction. For movement of the two feed elements, namely the holding body 14a and the pestle 20 , is a drive 41 in the case 40 arranged, which, as indicated, both elements can move forward. The drive for the ram 20 is designed to be that pestle 20 can suddenly move forward, as the plunger 20 must apply the deformation work.

Laterally on the housing 40 is a magazine 43 arranged in which a series of blind rivets is housed, which comes from the magazine 43 be inserted into the front area of the tool so that it faces the plunger 20 are aligned.

The in 9 Blind rivet shown is similar to the blind rivet after the 1 to 7 , In contrast to these is the inner opening 38 in this case, cylindrical throughout to a floor 39 , This floor 39 has a round adjacent to the wall 45 circumferential recess on, leaving the middle area of the floor 39 something raised above the edge. Otherwise, the blind rivet is the 9 similar to the previous embodiments. The blind rivet comes with a holding body 46 grabbed and through the hole 15 the two sheets 18 . 19 pushed through until the flat bottom 4 of the collar 3 rests on the top of the sheet. The holding body 46 again has an internal bore 16 through which an ele ment can be pushed through. This is in 10 shown, with first on the right half of 10 is referenced. Through the inner opening 16 the tool becomes a tie rod 49 pushed through until the tie rod 49 with his face 47 the ground 39 the inner opening 38 touched by the blind rivet. Then a connection between both surfaces takes place, for example a resistance welding. Subsequently, to the tie rod 49 drawn. This leads to the front area of the blind rivet, ie the area between the rear side 48 the sheets to be joined together 18 . 19 and the front end of the blind rivet, deformed. In this pulling on the front end of the blind rivet, the tool can with the holding body 46 support at the top of the collar. The result is in 10 shown on the left. Now the tie rod 49 detached from the blind rivet, for example, in that the tie rod 49 is twisted. This will shear off.

11 shows a tool, with the blind rivets behind 9 can be set. In the case 40 is the holding body 46 arranged axially displaceable. It actually only serves to guide the blind rivet when inserting and for supporting the tool when tightening the tie rod 49 , For the advance of the holding body 46 is a drive 41 intended for the advance and retraction of the tie rod 49 An unillustrated drive is also provided. In addition, the tie rod can 49 be twisted, what a gear 50 is indicated.

The blind rivets of 12 and 13 show further ways in which the invention can be implemented. In both examples, the blind rivet again contains a collar 3 , which has a substantially flat bottom 4 having. Under it should be understood that the bottom 4 Can have ribs, individual projections or the like, which can penetrate during insertion of the blind rivet in the surface of the element with which the blind rivet is to be connected. Such a training can serve to produce an anti-rotation. It is also conceivable that the substantially flat underside 4 of the collar 3 is slightly curved, so that the outer edge digs something into the surface. All these educations, which deviate slightly from a mathematical level, are to be understood by the term essentially flat bottom 4 fall.

The collar is formed substantially thicker in these two embodiments over the previous embodiments, so that the attack surface 5 a greater distance from the substantially flat bottom 4 having. Also in this case is the attack surface 5 ring-shaped, so that they bore 8th surrounds inside the blind rivet. The collar points to the bottom 4 subsequent first area 60 on, in which he has a hexagonal outer circumference. This hexagonal shape of the section 60 of the collar 3 can also with the blind rivet of 13 be given. At this first section 60 then closes a second section 61 where the collar is cylindrical and an external thread 62 having. The attack surface 5 , which is flat in the example shown, could also be curved. This also applies to the attack surfaces in the other embodiments.

The hexagonal section 60 can serve to attach a wrench.

In the embodiment according to 10 is in the thickened collar 3 in the inner bore an internal thread 63 introduced, in the area at the of the attack surface 5 emanates.

The in 12 and 13 Blind rivet shown may serve to attach objects to it after its setting, either using external thread 62 in the embodiment according to 12 or using the internal thread 63 in the embodiment according to 13 , When screwing on the hexagonal area 60 be held with a wrench to prevent the application of higher torques co-rotation of the blind rivet and thus a possible loosening. In the same way, the front, in the hole to introduce the part of the blind rivet, so the area between the front end and the flat bottom 4 , Also have a different cross section of a circular cross-section.

If a blind rivet can not only serve to join two sheets, but also to fix only oneself, so it is not required that the widening of the front area up the back of an element to which the blind rivet is attached should. It is also possible and is within the scope of the invention that the expansion within the hole or hole can be made in the element itself, if the element to which it is attached has a correspondingly large thickness having. A deformation of the front area to the outside can So also within a hole, also a blind hole, done.

While in the embodiment according to 9 the floor 39 the depression 38 has a smaller diameter than the recess 38 , this is in the embodiment according to 12 and 13 not the case. Here is the floor 39 formed without a circumferential notch. For deformation here can attack a tie rod, the front end is chamfered, so that in this way a smaller area is formed, which should facilitate shearing after the deformation process.

The depression 38 Incidentally, it does not need to have a constant cross-section, it can also be slightly funnel-shaped.

If the term "sheet metal" is used in the text of the description, this is only an example of the fact that the blind rivet according to the invention can be used to join two parts made of any materials. It is also possible to attach a single element to another element, for example a hook on a board. Furthermore, it is possible to use the rivet only so that it is itself fixed to an element, either in a through hole or a blind hole. This applies in particular to the embodiment according to 12 and 13 ,

Judging from the embodiment 12 and 13 from, or even from the embodiment according to 9 , so the central attack point can be formed increased, so closer to the collar 3 ,

Claims (33)

Blind rivet, with 1.1 a rivet body ( 1 1.2, a collar formed thereon ( 3 ), the 1.3 an at least approximately flat bottom ( 4 ) and 1.4 on the bottom ( 4 ) opposite front side ( 5 ) an attack surface for a tool ( 14 ), and with 1.5 a central attack surface for a widening process, which is 1.6 designed and arranged so that they upon impact of a tool (plunger 20 ) to a deformation of the front portion of the rivet body ( 1 ) in front of the bottom ( 4 ), in particular at a distance from the underside ( 4 ) of the collar leads. Blind rivet, with 2.1 a rivet body ( 1 2.2, a collar formed thereon ( 3 ), 2.3 an at least approximately flat bottom ( 4 ) and 2.4 on the bottom ( 4 ) opposite front side ( 5 ) an attack surface for a tool ( 11 ), and with 2.5 a central point of attack for a widening process, 2.6 is designed and arranged such that an access by a tool at this point of attack ( 8th ) to a deformation of the front portion of the rivet body ( 1 ) in front of the bottom ( 4 ) of the collar ( 3 ), in particular at a distance from this underside ( 4 ), leads. Blind rivet according to claim 1 or 2, wherein the central attack surface at the end of a hole ( 8th . 28 ) in the rivet body ( 1 ) is formed. Blind rivet according to one of the preceding claims, in which the central attack surface ( 7 ) at a narrowing of a hole ( 7 ) in the rivet body ( 1 ) is formed. Blind rivet according to one of the preceding claims, wherein the central attack surface of a constriction ( 12 . 29 ) of a hole ( 8th . 28 ) in the rivet body ( 1 ) is formed. Blind rivet according to one of the preceding claims, wherein the central attack surface of a ram ( 20 ) of a setting tool ( 14 ) can be acted upon. Blind rivet according to one of the preceding claims, in which in the hole ( 8th . 28 ) an expander ( 10 . 30 ), which is one of the central gripping surface associated with this opposite front end ( 11 ) having. Blind rivet according to claim 7, in which the expansion body ( 10 . 30 ) from the attack surface ( 5 ) of the collar ( 3 ) of the rivet body ( 1 ) stands out. Blind rivet according to one of the preceding claims, in which the hole ( 8th ) behind the narrowing ( 12 ) to the front ( 7 ) of the rivet tip ( 6 ) continues. Blind rivet according to one of the preceding claims, wherein the central attack surface for the tensile attachment of a tie rod ( 49 ) is trained. Blind rivet according to one of the preceding claims, with a non-circular cross section of the rivet body ( 1 ) and / or protrusions on the flat underside ( 4 ) of the collar ( 3 ). Blind rivet according to one of the preceding claims, in which the central point of attack on the ground ( 39 ) of the depression ( 38 ) is trained. Blind rivet according to one of the preceding claims, in which the central point of attack on the ground ( 39 ) of the depression ( 38 ) is raised and has a smaller diameter than the depression ( 38 ). Blind rivet according to one of the preceding claims, in which the collar ( 3 ) one with a thread, in particular an external thread ( 62 ) ( 61 ), which the attack surface ( 5 ) having. Blind rivet according to one of the preceding claims, in which the inner bore ( 8th ) an internal thread ( 63 ) having. Blind rivet according to one of the preceding claims, in which the front region of the rivet body ( 1 ) is formed for expansion within a hole. Method for producing blind rivets, in which 17.1 a rivet body ( 1 ) manufactured as a hollow rivet and with a collar ( 3 ) is provided in the region of its one end, 17.2 the rivet body ( 1 ) with an outer attack surface ( 5 ) and a central attack surface for each tool is provided, wherein 17.3 the area of the rivet body ( 1 ) between the front end ( 7 ) of the rivet body and the central attack surface is configured such that a sudden action on the central attack surface to a deformation of the rivet body ( 1 ) leads to this area. Method for setting blind rivets, in which 18.1 a blind rivet is inserted into an element until an underside ( 4 ) of his collar ( 3 18) then, by jerking against a central attack surface in the same direction, the region between this engagement surface and the tip of the blind rivet for widening the rivet body, in particular for forming a rivet head (US Pat. 22 ), is deformed. Method for setting blind rivets, in which 19.1 a blind rivet is inserted into an element until a lower side ( 4 ) of his collar ( 3 ) at the top ( 12 ) of the element, 19.2 into a depression ( 38 ) of the blind rivet a draw bolt ( 49 ) to the ground ( 39 ) of the blind rivet, 19.3 the draw bolt ( 49 ) with the ground ( 39 ) of the depression ( 38 ) 19.4 at the draw bolt ( 49 ) pulled to the deformation of the rivet and 19.5 the tension bolt ( 49 ) after the completion of the deformation, in particular after the formation of a rivet head, is separated from the blind rivet. The method of claim 19, wherein the compound a cold welding process is carried out. The method of claim 19, wherein the compound a resistance welding carried out becomes. The method of claim 19, wherein for the production the connection a capacitor discharge welding is performed. A method according to any one of claims 19 to 22, wherein the Traction under support a counter-element is applied to the blind rivet. Method according to claim 19 or 23, in which for connecting the draw bolt ( 49 ) with the blind rivet of the tension bolts ( 49 ) is screwed into the bottom of the recess and screwed out again after pulling out. Device for setting blind rivets, with 25.1 a holder for holding a blind rivet, 25.2 a tubular body at least in its front region ( 14a ), 25.3 a drive ( 41 ) for the advance of the holding body ( 14a ), 25.4 a coaxial with the holding body ( 15 ) arranged plunger ( 20 ), as well as with 25.5 a drive ( 41 ) for the sudden advance of the ram ( 20 ). Apparatus according to claim 25, including means to trigger the feed movement. Device for setting blind rivets, with 27.1 a holder for holding a blind rivet, 27.2 a tubular body at least in its front region ( 14a ), 27.3 a drive ( 41 ) for the advance of the holding body ( 14a ), 27.4 a coaxial with the holding body ( 14a ) arranged tie bolts ( 49 ), 27.5 a drive for the advance and retraction of the draw bolt ( 49 ), 27.5 a device for connecting the draw bolt ( 49 ) with the ground ( 39 ) of a well ( 38 ) in the blind rivet, 27.6 a device for releasing the connection between the draw bolts ( 49 ) and the blind rivet. Apparatus according to claim 27, with a rotating device for rotating the draw bolt ( 49 ). Apparatus according to claim 27 or 28, comprising Cold welding device. Device according to Claim 27 or 28, with a device for carrying out a resistance welding between the tension bolt ( 49 ) and the blind rivet. Device according to Claim 27 or 28, with a device for carrying out a capacitor discharge welding between the tension bolt ( 49 ) and the blind rivet. Device according to one of claims 26 to 31, in which the Rotary device acts as a shear. Device according to one of claims 25 to 32, with a magazine ( 43 ) for receiving and providing multiple blind rivets.