Patent ID: 6899408

Claim:
A track device comprising: an outer track having two stops; a middle track slidably mounted in said outer track, said middle track having two slots that provide a passage to said outer track; an inner track slidably mounted in said middle track, said inner track has at least one lateral wall acting as a press portion for releasing operation; and a resilient member including an engaging portion securely mounted to said middle track and two legs respectively extending through said slots of said middle track so that said legs face said outer track, each said leg having an engaging section adapted to engage with a respective one of said stops of said outer track, or disengage from said stop of said outer track by pressing said press portion against said resilient member; wherein when said middle track and said inner track are pulled outward to an extent that said middle track is pulled outward to a predetermined position, said engaging sections of said legs respectively abut against said stops of said outer track to thereby prevent inward movement of said middle track; alternatively in retracting operation, said press portion of said inner track contacts said resilient member such that said engaging sections of the legs of said resilient member are disengaged from said stops of said outer track to thereby allow inward movement of said middle track.