A bottom structure of a bed having a bottom formed so as to be bendable by a series of parallel strips mutually sequentially connected such that the strips are shorter in width on the side away from the sequentially connected side. In this way the bottom structure of the bed allows a portion of a bed...http://www.google.fr/patents/US5369826?utm_source=gb-gplus-shareBrevet US5369826 - Bottom structure of a bed
