| 摘要 |
PROBLEM TO BE SOLVED: To enhance the degree of freedom of an adjustment for approximating a torque line exerted by an energizing means energizing a seat in a raising-up rotating direction to a weight moment curve of the seat. SOLUTION: This tumbling mechanism 5B is provided with a torsion spring 20 to energize the seat 1 connected by a hinge to rise, fall down and rotate in relation to a floor F. The torsion spring 20 has one end 21 latched on a fixed side member 11 and the other end 22 latched on a movable side member 12. A shaft member 11b on the fixed side member 11 side abutting on the one end 21 of the torsion spring 20 to latch the end 21 is connected to a link member 14, and a relative position in relation to the fixed side member 11 is moved by interlocking with rising up rotation of the seat 1. By moving the shaft member 11b, torsion amount of the torsion spring 20 is changed. COPYRIGHT: (C)2008,JPO&INPIT
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