Rivet Setting Device

Abstract

What is proposed is a device for setting blind rivets which has a motor-actuated pulling device for pulling on the rivet mandrel. The pulling device comprises a disk spring which is initially stressed during the actuation of the pulling device. As soon as the force exerted on the rivet mandrel by the pulling device is sufficiently large such that the rivet mandrel breaks off as intended, the previously stressed spring suddenly relaxes and results in the part of the pulling device which engages on the rivet mandrel butting against a stop. As a result, this part of the pulling device then stops abruptly whereas the rivet mandrel is projected further. It is possible in this way for the rivet mandrel to be conveyed into a rivet mandrel container present in the housing without a user having to execute a particular operation for this purpose.

1 . A rivet setting device, with
 a housing ( 20 ),   a holder ( 2 ) arranged in the housing ( 20 ) for a rivet ( 1 ) to be set,   a pulling device ( 4 ) arranged in the housing ( 20 ) for pulling engagement on a rivet mandrel ( 7 ) of the rivet ( 1 ) arranged in the holder ( 2 ),   a drive for the pulling device ( 4 ), and with   an, in particular compressed, spring-elastic element ( 19 ) which engages on the pulling device ( 4 ) and is elastically deformed during the pull engagement, which element   is relaxed during the breaking-off of the rivet mandrel ( 7 ) in order to move a part of the pulling device ( 4 ) with the rivet mandrel ( 7 ) in the pulling direction.   
     
     
         2 . The rivet setting device as claimed in  claim 1 , wherein the pulling device ( 4 ) surrounds a central tube ( 9 ) which extends in the axial direction and in which the rivet mandrel ( 7 ) is guided. 
     
     
         3 . The rivet setting device as claimed in  claim 1 , wherein the pulling device ( 4 ) has, in the region of its front end assigned to the holder ( 2 ) for the blind rivet ( 1 ) to be set, a clamping sleeve ( 5 ) which, during pulling, charges the clamping jaws ( 8 ) radially against the rivet mandrel ( 7 ) and/or a release mechanism ( 11 ) which radially moves the clamping jaws ( 8 ) away from the rivet mandrel ( 7 ) when the rivet mandrel ( 7 ) is broken off. 
     
     
         4 . The rivet setting device as claimed in  claim 3 , wherein the clamping sleeve ( 5 ) has, in the region of its front end, an inner cone ( 6 ) which widens in the pulling direction and by means of which it bears against the outer side of the clamping jaws ( 8 ). 
     
     
         5 . The rivet setting device as claimed in  claim 3 , wherein, in order to load the clamping jaws ( 8 ) in the axial direction, a compression spring ( 12 ) is provided which acts in particular on a jaw closer ( 11 ) bearing against the clamping jaws ( 8 ). 
     
     
         6 . The rivet setting device as claimed in  claim 5 , wherein the clamping jaws ( 8 ) and the jaw closer ( 11 ) are tailored to one another in such a way that a loading of the jaw closer ( 11 ) by the compression spring ( 12 ) leads not only to an axial loading of the clamping jaws ( 8 ) against the clamping sleeve ( 5 ) but also to a smaller loading of the clamping jaws ( 8 ) in the radially outward direction. 
     
     
         7 . The rivet setting device as claimed in  claim 1 , wherein the spring-elastic element ( 19 ) is a disk spring, in particular a disk spring assembly, which is advantageously arranged in a housing ( 18 ) which surrounds it. 
     
     
         8 . The rivet setting device as claimed in  claim 1 , with a rivet mandrel container ( 25 ) arranged in the housing ( 20 ) for the broken-off rivet mandrels ( 7 ) of a plurality of set rivets. 
     
     
         9 . The rivet setting device as claimed in  claim 11 , with a device for introducing a broken-off rivet mandrel ( 7 ) into the rivet mandrel container ( 25 ), which rivet mandrel is moved through the tube ( 9 ). 
     
     
         10 . The rivet setting device as claimed in  claim 1 , with a drive ( 21 ) for setting the rivets, wherein the drive ( 21 ) is arranged in particular in such a way that it can be moved, in particular pivoted or displaced, out of the axial expansion of the tube ( 9 ) passing through the pulling device ( 4 ). 
     
     
         11 . The rivet setting device as claimed in  claims 13 , wherein an inlet can be moved into the rivet mandrel container ( 25 ) in the axial extension of the tube ( 9 ) passing through the pulling device ( 4 ). 
     
     
         12 . The rivet setting device as claimed in  claims 8 , with a deflecting device for deflecting into the rivet mandrel container ( 25 ) a broken-off rivet mandrel ( 7 ) moved through the tube ( 9 ), wherein the deflection device is designed to be movable between the tube ( 9 ) and the drive for the pulling device ( 4 ). 
     
     
         13 . A method for setting a rivet, comprising the following steps:
 a rivet mandrel ( 7 ) of a rivet is introduced into a rivet setting device,   pulling is carried out on the rivet mandrel ( 7 ) by means of a pulling device ( 4 ) of the rivet setting device,   at the same time as the pulling, a spring-elastic element ( 19 ) engaging on the pulling device ( 4 ) is stressed,   pulling is continued until the rivet mandrel ( 7 ) breaks off,   after the rivet mandrel ( 7 ) has broken off, a part of the pulling device ( 4 ) with the broken-off rivet mandrel ( 7 ) is moved in the pulling direction by relaxing the spring-elastic element ( 19 ).   
     
     
         14 . The method as claimed in  claim 13 , wherein after the method step 13.5 the rivet mandrel ( 7 ) is released by the pulling device ( 4 ). 
     
     
         15 . The method as claimed in  claim 13 , wherein the rivet mandrel ( 7 ) is moved into a rivet mandrel container ( 25 ) after the method step of  claim 14 . 
     
     
         16 . The method as claimed in  claim 13 , wherein the part of the pulling device ( 4 ) moved in the method step 13.5 is braked, in particular by means of a stop, before or after the method step of  claim 15 .