Positioning and push-in arrangement for a track device

Abstract

A track device comprises a first track and a second track slidably received in the first track. An engaging member is mounted to an end of the first rack and includes at least one positioning block. The second track further includes two hooks for engaging with two ends of a pressing member mounted to the second track. The pressing member includes a protruded portion that can be pressed. The pressing member further includes at least one notch defined by two parallel walls. When the second track is pulled outward along a longitudinal direction, the notch is engaged with the positioning block of the engaging member of the first track, thereby providing a better positioning effect. When the protruded portion of the pressing member is pressed, the notch is disengaged from the positioning block, thereby allowing disengagement or engagement of the second track from or into the first track.

What is claimed is:  
     
         1 . A track device comprising: 
 a first track including an upper longitudinal lip and a lower longitudinal lip, the first track including a first stop on an end thereof, an engaging member being mounted to another end of the first rack and including at least one positioning block; and    a second track including an upper longitudinal lip and a lower longitudinal lip that are slidably received between the upper longitudinal lip and the lower longitudinal lip of the first track, the second track including a second stop on an end thereof, the second track further including two hooks, a pressing member being mounted to the second track and including two ends engaged with the hooks, respectively, the second track including a protruded portion that can be pressed, the pressing member further including at least one notch defined by two parallel walls;    wherein when the second track is pulled outward along a longitudinal direction, said at least one notch of the pressing member is engaged with said at least one positioning block of the engaging member of the first track, and when a relatively larger force is applied to the second track, said at least one positioning block is moved across an associated one of the walls of said at least one notch, thereby allowing the second track to be telescoped into the first track.    
     
     
         2 . The track device as claimed in  claim 1 , wherein said engaging member includes two upright walls each having a cylindrical portion located between an associated one of the upper longitudinal lip and the lower longitudinal lip of the first track and an associated one of the upper longitudinal lip and the lower longitudinal lip of the second track.  
     
     
         3 . The track device as claimed in  claim 1 , wherein the first track includes a resilient abutting portion against which the second stop of the second track abuts.  
     
     
         4 . The track device as claimed in  claim 1 , wherein said at least one notch of the pressing member is located in the protruded portion.  
     
     
         5 . The track device as claimed in  claim 1 , wherein one of the walls of said at least one notch of the pressing member includes an inclined face.