| 摘要 |
<p>PROBLEM TO BE SOLVED: To make a structure simples and to prevent the body of a user from being pressed by a back lifting. SOLUTION: In order to mount a back frame 6 holding a back bottom 5, a base end side is made movable via a roller 12 along a guide frame 3 arranged side by side on a main frame 2 and is held via a stay 4 at a portion close to the base end side. This back frame 6 is constituted so as to be inclinable and adjustable by a direct acting driving mechanism 7. Between a back bottom 5 close to a center and a waist bottom 10 mounted on the main frame 2, a curved bottom 11 constituted so as to be bent with a proper curvature is mounted. A tip side directing to a bed head side of the guide frame 3 is bent at a prescribed angle of elevation.</p> |
