| 摘要 |
<p>PROBLEM TO BE SOLVED: To raise the head and to hold it easily without using any support. SOLUTION: By activating a direct driving mechanism at a back raising mechanism 2, first and second links 5 and 6 are raised while being interlocked, a back bottom frame 3 is raised so as to be pushed up, a head side bottom 1a is displaced while being interlocked through an interlock post 9 communicating to the second link 6 until the back bottom frame 3 is raised at a prescribed angle, by raising the bottom over the prescribed angle, the back side bottom 1a is recovered while laying down the back bottom frame 3 again and in the state of flattening the head side bottom 1a and a back side bottom 1b, the back side bottom frame 3 is raised up to the limit angle of rising.</p> |
