| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible to raise one's knees in synchronism with back raising, and at the same time, to perform only the back raising. SOLUTION: An actuating arm 13 in a back raising link 12 fitted rotatably to a main frame 3 is connected to a drive source of a back raising mechanism, whereas the actuating arm 13 is connected to a knee raising link 9 via a first connecting shaft 14 and a second connecting shaft 15. The first connecting shaft 14 and the second connecting shaft 15 move together toward the shaft direction by engaging a pin on the first connecting shaft 14 side with a bending portion in the long hole located at the tip of the second connecting shaft 15, and the second connecting shaft 15 can be made movable from the first connecting shaft 14 within the length of the long hole.</p> |
