Fastening device for placement on a mounting rail

Abstract

A fastening device ( 21 ) for placement on a mounting rail having a back-engagement part ( 22 ) for insertion into a mounting opening of the mounting rail and for engaging behind edges of the mounting opening of the mounting rail, having a support plate ( 42 ) for coming in contact with the mounting rail on the outside, having a spring element ( 52 ) for prestressing the back-engagement part ( 22 ) in a circumferential direction with respect to an axis of rotation ( 27 ) of the back-engagement part ( 22 ), which is perpendicular to a plane (E) spanned by the support plate ( 42 ), and having a holding device ( 31 ) for holding the back-engagement part ( 22 ) in a prestressed position, such that the back-engagement part ( 22 ) is transferrable from the insertion position into an engagement position engaging behind the edges of the mounting opening by spring element ( 52 ) when the holding device ( 31 ) is released. The holding device ( 31 ) includes a holding element ( 32 ) which for the release of the holding device ( 31 ) is displaceable axially relative to the plane (E) spanned by the support plate ( 42 ) with respect to the axis of rotation ( 27 ) of the back-engagement part ( 22 ).

1 . A fastening device for placement on a mounting rail comprising:
 a back-engagement part for insertion into a mounting opening in the mounting rail and for engaging behind edges of the mounting opening of the mounting rail;   a stop plate for coming in contact with the mounting rail on an outside;   a spring element for prestressing the back-engagement part in a circumferential direction with respect to an axis of rotation of the back-engagement part standing perpendicular to a plane spanned by the stop plate; and   a holding device for holding the back-engagement part in a prestressed position, the back-engagement part being transferrable from the insertion position into an engagement position engaging behind edges of the mounting opening by the spring element when the holding device is released,   the holding device including a holding element displaceable axially in relation to the plane spanned by the stop plate for releasing the holding device with respect to the axis of rotation of the back-engagement part.   
   
   
       2 . The fastening device as recited in  claim 1  wherein at least one entraining section protrudes away from the holding element and induces the axial displacement of the holding element in relation to the plane spanned by the support plate to release the holding device. 
   
   
       3 . The fastening device as recited in  claim 1  wherein the holding element has at least one stop cam for limiting the axial displacement of the holding element in relation to the support plate. 
   
   
       4 . The fastening device as recited in  claim 1  wherein the support plate has an elongated recess having a U-shaped cross section insertable into the mounting opening of the mounting rail, the back-engagement part being situated in this recess. 
   
   
       5 . The fastening device as recited in  claim 4  wherein a bearing point for the back-engagement part is provided on the bottom section of the U-shaped recess. 
   
   
       6 . The fastening device as recited in  claim 4  wherein a guide opening for the back-engagement part is provided in at least one of the side walls of the U-shaped recess. 
   
   
       7 . The fastening device as recited in  claim 4  wherein an axial guide for the holding element is provided in at least one of the side walls of the U-shaped recess. 
   
   
       8 . The fastening device as recited in  claim 1  wherein the spring element is provided between the support plate and the back-engagement part. 
   
   
       9 . The fastening device as recited in  claim 1  wherein the back-engagement part has at one least ramp-shaped clamping face on its tensioning face. 
   
   
       10 . The fastening device as recited in  claim 1  wherein an adapter element connectable to the support plate is provided. 
   
   
       11 . A fastening system comprising:
 a plate-shaped element; and   a plurality of fastening devices as recited in  claim 1  for placing the plate-shaped element on mounting rails, the fastening devices being secured on the plate-shaped element.