Screwed connection and connecting means for it and method of producing them

Abstract

A screwed connection has a first connecting means with an external thread and a second connecting means with an internal thread. In order to avoid self-slackening of the screwed connection, the external thread has a denticulation ( 14 - 16 ) which interacts with a mating denticulation of the internal thread.

1 . A screwed connection with an internal thread, having at most one thread turn, characterized in that the connecting means ( 131 ) is part of a sheet-like material ( 132 ), the sheet-like material having material reinforcement ( 142 ) in the region of the internal thread ( 138 ), in which material reinforcement ( 142 ) the thread turn is embossed.  
     
     
         2 . The connecting means as claimed in  claim 18 , characterized in that the material reinforcement ( 142 ) consists of displaced material of the sheet-like material.  
     
     
         3 . The connecting means ( 31 ) as claimed in  claim 1  or  2 , characterized in that the internal thread ( 32 ) has a denticulation ( 14 - 16 ).  
     
     
         4 . The connecting means as claimed in  claim 3 , characterized in that the denticulation ( 14 - 16 ;  44 - 46 ) is designed as a locking denticulation favoring one direction of rotation, in particular that direction of rotation for the screwing-in.  
     
     
         5 . The connecting means as claimed in  claim 3  or  4 , characterized in that the denticulation ( 15 ;  45 ) is arranged on a flank ( 11 ;  41 ) of the internal thread ( 2 ;  32 ).  
     
     
         6 . The connecting means as claimed in one of  claims 3  to  5 , characterized in that the denticulation ( 14 ,  16 ;  44 ,  46 ) is arranged either in a groove root ( 9 ) of the thread ( 2 ;  32 ) or on a crest ( 13 ) of the thread ( 2 ;  32 ).  
     
     
         7 . The connecting means as claimed in one of  claims 3  to  6 , characterized in that the thread is a metric thread.  
     
     
         8 . The connecting means as claimed in one of  claims 3  to  7 , characterized in that the thread is an Acme thread.  
     
     
         9 . The connecting means with an internal thread as claimed in one or more of  claims 3  to  8 , characterized in that only part of the internal thread ( 32 ), which part is accessible from the top side or bottom side, is provided with the denticulation.  
     
     
         10 . The connecting means with an internal thread as claimed in one of  claims 1  to  8 , characterized in that the sheet-like material ( 132 ) is a metal sheet.  
     
     
         11 . A connecting means with an internal thread having a plurality of thread turns, characterized in that a plurality of connecting means ( 71 ) as claimed in one of  claims 1  to  10  having at most one thread turn are connected to form a stack.  
     
     
         12 . The connecting means with an internal thread as claimed in  claim 11 , characterized in that a compensating disk ( 74 ) with or without a thread turn is provided at least on one side of the stack.  
     
     
         13 . The connecting means with an internal thread as claimed in  claim 12 , characterized in that the individual connecting means ( 71 . 1  to  71 . 3 ;  111 ,  112 ) of the stack and the compensating disk ( 74 ;  116 ,  117 ) has surface sections ( 113 ,  114 ) which are perpendicular to the connecting axis ( 104 ).  
     
     
         14 . The connecting means with an internal thread as claimed in one of  claims 11  to  13 , characterized in that the connecting means ( 71 . 1  to  71 . 3 ,  74 ;  111 ,  112 ,  116 ,  117 ) of the stack are connected to one another, in particular by welding, adhesive bonding or by clinching or by TOX joining.  
     
     
         15 . The connecting means with an internal thread as claimed in one of  claims 11  to  13 , characterized in that at least two connecting means ( 151 . 1 - 151 . 5 ) of the stack are connected to one another in an integral manner and are arranged so as to lie one on top of the other by bending them over.  
     
     
         16 . A method of incorporating an internal thread in a sheet-like material ( 132 ), characterized in that, in a first step, the sheet-like material ( 132 ) is pierced, the material displaced by the piercing being arranged laterally in the form of a turned-out portion ( 141 ), in that, in a second step, the turned-out portion ( 141 ) is made more uniform to form a collar ( 142 ), and in that, in a third step, a thread turn ( 133 ) is embossed with the collar ( 142 ) being deformed.  
     
     
         17 . The method as claimed in  claim 16 , characterized in that, in a fourth step, a denticulation ( 137 ) is stamped in the thread turn ( 133 ).  
     
     
         18 . A method of producing a connecting means having a plurality of thread turns, characterized in that, as claimed in the steps of  claim 16  or  17 , in a further step, the sheet-like material ( 150 ) is bent over in such a way that at least two openings ( 152 ) at least partly overlap, and in that, in a further step, the folded sheet-like material ( 150 ) is deformed in such a way that the thread turns ( 153 ) are arranged to form an internal thread.  
     
     
         19 . The method as claimed in  claim 18 , characterized in that the sheet-like material ( 150 ) has supporting collars ( 156 ,  157 ) at its ends, these supporting collars ( 156 ,  157 ) having been produced by bending over the sheet-metal strip, the connecting means ( 151 . 1 ) which is adjacent to the connecting means carrying the supporting collars ( 156 ) being supported on the supporting collar ( 156 ).  
     
     
         20 . The method as claimed in  claim 18  or  19 , characterized in that the folded sheet-like material ( 150 ), before being compressed, has an axis which passes through the openings and is at an angle a to the subsequent center axis of the compressed sheet-like material ( 150 ).  
     
     
         21 . The method as claimed in one of  claims 18  to  20 , characterized in that the sheet-like material ( 150 ) is compressed only to such an extent that there is a distance between the end-side connecting means ( 151 . 1  or  151 . 5 ) and the adjacent connecting means ( 151 . 2  and  151 . 4  resp.).