Telescopic rail

Abstract

A telescopic rail with at least two rail elements displaceable relative to each other in a longitudinal direction, which comprise at least one outer rail ( 1 ), one inner rail ( 2 ) and optionally one or more middle rails, in which the rail elements have supporting surfaces, sliding surfaces or both, and in which in each case between two rail elements arranged displaceably against each other, at least one slide element ( 3 ) is provided. In order to provide a telescopic rail in particular for the car industry, which can support high loads with comparatively compact dimensions, according to the invention the slide element ( 3 ) has slides which extend between the supporting surfaces and sliding surfaces of two rail elements displaceable against each other and are in contact with the sliding and supporting surfaces.

1 . A telescopic rail having at least two rail elements ( 1 , 2 ) displaceable against each other in a longitudinal direction, at least one of said rail elements having a supporting surface ( 5 ) and at least another of said rail elements having a sliding surface ( 6 ), said supporting surface and said slide surface being proximate each other and displaceable relative to each other and in which at least one slide element ( 3 ) is provided between said supporting surface and said slide surface wherein the slide element ( 3 ) has slides ( 7 ) which extend between and contact the supporting surface ( 5 ) and sliding surface ( 6 ).  
   
   
       2 . The telescopic rail of  claim 1  having an outer rail ( 1 ), an inner rail ( 2 ) and at least one middle rail wherein the outer rail is provided with a support surface for mating with a slide surface of a middle rail and the inner rail is provided with a slide surface for mating with a support surface on a middle rail ( 3 ) and a plurality of slides ( 3 ) are provided between the support and slide surfaces.  
   
   
       3 . A telescopic rail according to  claim 1 , wherein sections of the rail elements ( 1 ,  2 ) forming the supporting ( 5 ) or sliding surfaces ( 6 ) have an essentially U-shaped cross-section, the slides ( 7 ) of the slide element ( 3 ) have a cross-section preferably adapted to the U-shaped cross-section of the sections forming the supporting or sliding surfaces, the slides ( 7 ) of the slide element ( 3 ) are connected with each other with a connection section ( 18 ) and the supporting ( 5 ) or sliding surfaces ( 6 ) of the rail elements ( 1 ,  2 ) grip the slides to the extent that the rail elements ( 1 ,  2 ) are held together and prevented from separating.  
   
   
       4 . A telescopic rail according to  claim 2 , wherein sections of the rail elements ( 1 , 2 , 3 ) forming the supporting ( 5 ) or sliding surfaces ( 6 ) have an essentially U-shaped cross-section, the slides ( 7 ) of the slide elements ( 3 ) have a cross-section preferably adapted to the U-shaped cross-section of the sections forming the supporting or sliding surfaces, the slides ( 7 ) of the slide element ( 3 ) are connected with each other with a connection section ( 18 ) and the supporting ( 5 ) or sliding surfaces ( 6 ) of the rail elements grip the slides to the extent that the rail elements are held together and prevented from separating.  
   
   
       5 . A telescopic rail according to  claim 1  wherein the slide element ( 3 ) between two rail elements displaceable opposite each other is fixed to one of the rail elements against displacement in longitudinal direction relative to the rail element.  
   
   
       6 . A telescopic rail according to  claim 5 , wherein the slide element ( 3 ) is secured by clamping to one of the two adjacent rail elements.  
   
   
       7 . A telescopic rail according to  claim 1  wherein the telescopic rail has a plurality of slide elements between adjacent rail elements displaceable against each other.  
   
   
       8 . A telescopic rail according to  claim 2  wherein the telescopic rail has a plurality of slide elements between adjacent rail elements displaceable against each other.  
   
   
       9 . A telescopic rail according to  claim 3  wherein the telescopic rail has a plurality of slide elements between adjacent rail elements displaceable against each other.  
   
   
       10 . A telescopic rail according to  claim 1  wherein the slide element ( 3 ) is produced from a plastic.  
   
   
       11 . A telescopic rail according to  claim 2  wherein the slide elements ( 3 ) are produced from a plastic.  
   
   
       12 . The telescopic rail of  claim 10  where the plastic is selected from the group consisting of polyoxymethylene/polyacetal (POM) and polyamide.  
   
   
       13 . A telescopic rail according to  claim 1  wherein the slide element ( 3 ) has at least one locking element ( 10 ) and a rail element has at least one device for locking into the locking element ( 10 ).  
   
   
       14 . A telescopic rail according to  claim 13 , where the locking element ( 10 ) in the direction of the displacement of the rail elements has lead-in and lead-off inclines ( 19 ), and a recess ( 14 ) in between, and the device on the rail element is a locking pin ( 4 ) for locking into the locking element.  
   
   
       15 . A telescopic rail according to  claim 14 , wherein the slide element ( 3 ) has several locking elements ( 10 ) offset relative to one another.  
   
   
       16 . A telescopic rail according to  claim 14  where the slide element ( 3 ) has at least two locking elements ( 10 ), which are arranged opposite each other, so that the locking pin ( 4 ) can simultaneously be engaged with the recesses in both locking elements ( 10 ).  
   
   
       17 . A telescopic rail according to  claim 1  wherein the slide element ( 3 ) has one or more devices for braking the sliding longitudinal movement between two rail elements relative to each other.  
   
   
       18 . A telescopic rail according to  claim 2  wherein the slide element ( 3 ) has one or more devices for braking the sliding longitudinal movement between two rail elements relative to each other.  
   
   
       19 . A telescopic rail according to  claim 17 , where the device for braking comprises one or more brake shoes ( 11 ) which are elastically mobile and which can be spread apart by an eccentric ( 12 ), with the result that they can be brought into friction contact with one of the rails.  
   
   
       20 . A telescopic rail according to  claim 17  where the device for braking comprises an eccentric self-locking brake.  
   
   
       21 . A telescopic rail according to  claim 20 , where the eccentric brake has at least one rotatably supported eccentric ( 27 ,  28 ) pre-tensioned with a spring ( 31 ,  32 ), which is pushed against the inner surface of the inner rail ( 2 ), the eccentric being designed such that it is movably driven by the inner rail ( 2 ) in the locking direction.  
   
   
       22 . A telescopic rail according to  claim 21 , where the at least one eccentric ( 27 ,  28 ) can be rotated by a rotatably supported cam ( 33 ) against the spring tension out of the region of the friction engagement with the inner rail ( 2 ).  
   
   
       23 . A telescopic rail according to  claim 1 , where a slide element ( 3 ) has a slide ( 13 ) which is displaceable opposite the slide element ( 3 ) and at least one outer surface of which is designed as a brake shoe ( 11 ), said brake shoe ( 11 ) being elastically mobile, spreadable and capable of being brought into friction contact with one of the rail elements.  
   
   
       24 . A telescopic rail according to  claim 1  where a slide element ( 3 ) has devices for braking sliding longitudinal displacement of the adjacent rail elements moving relative to each other in each case when maximum extension is reached.  
   
   
       25 . A telescopic rail according to  claim 1  where a slide element has at least one end stop for limiting the displacement of two rail elements against each other.  
   
   
       26 . Telescopic rail according to  claim 25 , where the end stop has at least one lead-in incline and a recess for locking a rail element in the extended position.  
   
   
       27 . A slide element for a telescopic rail, as defined in  claim 1 .  
   
   
       28 . A slide element for a telescopic rail, as defined in  claim 2 .  
   
   
       29 . A slide element for a telescopic rail, as defined in  claim 3.