| 摘要 |
An armrest height-adjusting device has a collar ( 7 ) fixed to a seat back frame ( 5 ) and a spring ( 11 ). The spring ( 11 ) includes a coil portion ( 11 A) provided on the outer periphery of the collar ( 7 ), a first leg portion ( 11 B) engaging with the seat back frame ( 5 ), and a second leg portion ( 11 C) received in a window portion ( 41 ) of the seat back frame ( 5 ). A diameter of the coil portion ( 11 A) becomes short by the downward rotation of an arm frame ( 10 ) and becomes large by the upward rotation of the arm frame ( 10 ). The second leg portion ( 11 C) is guided into the hook ( 21 ) by abutting against the window portion ( 41 ) when the arm frame ( 10 ) is rotated upward beyond a predetermined position. When the second leg portion ( 11 C) is engaged with the hook ( 21 ), the diameter of the coil portion ( 11 A) is kept in a state of becoming large.
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