Bottom for bed apparatus

Abstract

To provide a bottom for a bed apparatus that can relieve the sensation of being pressed and that at the same time is lightweight, easy to transport and can be cleaned easily. A bottom for a bed apparatus having a back-raising mechanism, includes a flexing bottom that is arranged between a back bottom and a hip bottom and can be flexed. In a back-raising operation, the flexing bottom flexes between the back bottom and the hip bottom whilst sliding downward over the surface of the uprising back bottom.

1 . A bottom for a bed apparatus having a back-raising mechanism, comprising:
 a flexing bottom that can be flexed between a back bottom for supporting the back and a hip bottom for supporting the hips, wherein   the flexing bottom is arranged slidably over the surface of the back bottom, joined and fixed to the hip bottom, and   in a case of a back-raising operation, the flexing bottom flexes between the back bottom and the hip bottom while sliding downward over the surface of the uprising back bottom.   
     
     
         2 . The bottom for a bed apparatus according to  claim 1 , wherein a pair of a slot elongated in the sliding direction and a pin that moves being fitted therein, or plural pairs of the slots and pins, are provided in the corresponding positions of the back bottom and the flexing bottom, respectively, or vice versa. 
     
     
         3 . The bottom for a bed apparatus according to  claim 1 , wherein the back bottom is formed with a hollow that accommodates the flexing bottom and allows the flexing bottom to slide therein. 
     
     
         4 . The bottom for a bed apparatus according to  claim 1 , wherein the flexing bottom is constructed so as to be flexible by arranging a plurality of elongated bars each having a trapezoidal section and extended in the width direction, in the length direction and joining one to another with a thin part, forming an approximately bellows-like structure. 
     
     
         5 . The bottom for a bed apparatus according to  claim 4 , further comprising a knee bottom for supporting the knees and a foot bottom for supporting the feet, wherein the hip bottom, the knee bottom and the foot bottom have the same flexing structure as the flexing bottom.