Patent ID: 7448687
Filing Date: 2008-11-11
Classification: A47C

Abstract:
1. A lift device, comprising: an outer pipe; a guide track secured in the outer pipe and having two opposite sides each formed with a plurality of locking grooves; an inner pipe movably mounted in the guide track; a follower having an upper end secured to a lower end of the inner pipe to move with the inner pipe; a locking member pivotally mounted in a lower end of the follower and having two opposites ends each formed with a locking portion protruded from the follower and detachably locked in one of the locking grooves of the guide track; a pull handle movably mounted in the inner pipe and having a lower end extended through the follower and connected to the locking member to pivot the locking member relative to the guide track; a control knob movably mounted on an upper end of the inner pipe and connected to an upper end of the pull handle to move the pull handle; a spring mounted on the pull handle and biased between the follower and the lower end of the pull handle to push the pull handle toward the locking member; wherein the follower has a side formed with an elongated guide channel to allow movement of the pull handle; the inner pipe has an inside formed with a conduit mounted on the upper end of the follower and connected to the guide channel of the follower; the upper end of the inner pipe has a side formed with a sliding slot connected to the conduit to allow movement of the control knob; the pull handle has an upper end formed with a post, and the control knob includes a slide slidably mounted on the inner pipe and protruded from the outer pipe, a retainer secured on the slide and provided with a sleeve extended through the slide and the sliding slot of the inner pipe and mounted on the post of the pull handle, and a fastening screw extended through the sleeve of the retainer and screwed into the post of the pull handle to secure the retainer to the pull handle and to attach the slide onto the inner pipe.