Collapsing device of a desk

Abstract

A collapsing device for a desk includes a main frame provided with two longitudinal rods respectively disposed with projections and a pivotal hole. Two guide frames are respectively fixed at opposite upper corners of a front plate and bored with a through channel extending backward and slanting upward to correspond with the pivotal hole. Two pivotal wheels are respectively received in the guide frames and actuated to shift therein, and two leg frames are pivotally assembled between the rear side of the front plate and the guide frames, respectively having an upper side bored with plural fitting slots. Thus, when the longitudinal rods are pivotally turned downward or upward by the pivotal wheels, with the projections of the longitudinal rods respectively fitted in or pulled out of the fitting slots of the leg frames, the desk can be stretched or collapsed.

1 . A collapsing device for a desk comprising a main frame, two guide frames, two pivotal wheels and two leg frames;
 Said main frame secured at an underside of a desk top plate, said main frame provided with two longitudinal rods respectively having a bottom side fixed thereon with a plurality of projections, said two longitudinal rods respectively having an outer front end bored with a pivotal hole;   Said two guide frames respectively positioned at an upper corner of two opposite sides of a front plate and extending backward vertically to form a U-shaped body, said guide frame having an inner side bored with a through channel extending backward and slanting upward, said channel corresponding with said pivotal hole of said main frame;   Said two pivotal wheels pivotally connecting said guide frames and said longitudinal rods of said main frame, said two pivotal wheels respectively formed with a wheel shaft inserted through said channel of said guide frame and secured in said pivotal hole of said longitudinal rod, said pivotal wheel received in said channel of said guide frame and actuated to shift and operate therein; and   Said two leg frames pivotally assembled between a rear side of said front plate and said guide frames, said two leg frames respectively having an upper side bored with a plurality of fitting slots to be respectively fitted in by said projections of said longitudinal rods of said main frame.