Round pipe base frame for cushion arrangement, has L-shaped and straight backrest units having two locking hinges that are used to adjust integrated couch surface between certain range when backrest units are in retracted position

摘要

The frame has a front support and two pneumatic springs attached at a rear portion of the frame to form an L-shaped two-piece backrest. The backrest consists of two units (1, 2) such as straight backrest unit and an L-shaped unit, which can be separated from each other. Two locking hinges in the backrest units are used to adjust an integrated couch surface from 200 to 90 centimeter when the backrest units are in retracted position. The backrest units are continuously retracted or extended by the activated spring.