Sliding rail receiving positioning structure

Abstract

A sliding rail receiving and positioning structure includes a sliding rail assembly having a bottom rail and a top rail mounted in the bottom rail and movable relative to the bottom rail between a received position and an extended position, and a positioning device having a first positioning portion affixed to one end of the bottom rail on the inside and a second positioning portion kept in alignment with the top rail and adapted for securing the top rail in the received position after movement of the top rail into the inside of the bottom rail, prohibiting the sliding box that is affixed to the top rail from being forced by its weight to move away from the received position accidentally.

What is claimed is: 
     
         1 . A sliding rail receiving and positioning structure, comprising:
 a sliding rail assembly, said sliding rail assembly comprising a bottom rail and a top rail mounted in said bottom rail and axially movable in and out of said bottom rail between a received position and an extended position; and   a positioning device, said positioning device comprising a first positioning portion and a second positioning portion, said first positioning portion being affixed to one end of said bottom rail on the inside, said second positioning portion being kept in alignment with said top rail for adapted for securing said top rail in the received position after movement of said top rail into the inside of said bottom rail.   
     
     
         2 . The sliding rail receiving and positioning structure as claimed in  claim 1 , wherein said first positioning portion is affixed to one end of said bottom rail remote from the extending direction of said top rail along which said top rail is movable out of said bottom rail. 
     
     
         3 . The sliding rail receiving and positioning structure as claimed in  claim 1 , wherein said sliding rail assembly further comprises an intermediate rail set in between and axially slidable relative to said bottom rail and said top rail, said intermediate rail having two coupling portions longitudinally arranged at two opposite sides thereof and respectively slidably coupled to said bottom rail and said top rail in such a manner that said top rail is axially movable in and out of said intermediate rail and axially movable with said intermediate rail in and out of said bottom rail. 
     
     
         4 . The sliding rail receiving and positioning structure as claimed in  claim 1 , wherein said first positioning portion comprises a positioning hole located on a bottom side thereof; said bottom rail comprises a through hole; said sliding rail assembly further comprises a fastening member mounted in said through hole and fastened to said positioning hole to affix said positioning device to said bottom rail. 
     
     
         5 . The sliding rail receiving and positioning structure as claimed in  claim 1 , wherein said positioning device further comprises two friction arms extended from two sides of said second positioning portion, each said friction arm having two transverse ribs spaced apart in a parallel manner for friction engagement with said top rail. 
     
     
         6 . The sliding rail receiving and positioning structure as claimed in  claim 5 , wherein said top rail comprises two raised positioning spots for positioning in between the two transverse ribs at each said friction arm. 
     
     
         7 . The sliding rail receiving and positioning structure as claimed in  claim 1 , wherein said first positioning portion is affixed to one end of said bottom rail adjacent to the extending direction of said top rail along which said top rail is movable out of said bottom rail; said positioning device further comprises two friction arms extended from two sides of said second positioning portion; said sliding rail assembly further comprises a positioning rod fixedly mounted in one end of said top rail remote from said top rail and adapted for positioning in between said friction arms of said positioning device to secure said top rail in the received position inside said bottom rail. 
     
     
         8 . The sliding rail receiving and positioning structure as claimed in  claim 7 , wherein each raid friction arm comprises a retaining portion protruded from an inner side thereof.