US Patent 8002470 Drawable track assembly

A drawable track assembly comprises a track and a retainer; the track being installed on a drawable box or other computer peripherals; the track having a plurality of locking points serving to be combined with a drawable box; the retainer is locked to a frame; and the retainer being installed with at least one rolling unit; thereby, a center of the retainer being formed with a sliding space at a central area thereof for receiving the track. Each of two sides of a long sheet of the track is extended with a strip for retaining a drawable box. A front end of the retainer is bent with a bending section with at least one through hole. The rolling unit is formed with a rolling post and a bearing set.