| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a seat adjustment device capable of inhibiting backlash caused between internal teeth of plates and planetary gears.SOLUTION: A seat adjustment device includes: a first plate 1; a second plate 2; three planetary gears 3 which mesh with the first plate 2 and the second plate 2; a sun gear 4; planetary gear holding members 5a, 5b which hold the planetary gears 3 so that the planetary gears 3 can move in a radial direction of the first plate 1 and the second plate 2; a movement operation member 6 which moves the planetary gears 3; and a biasing member 7 serving as locking means which locks the planetary gear holding members 5a, 5b on the movement operation member 6. The movement operation member 6 is formed so as to guide the planetary gears 3 to the radial outer side of the first plate and the second plate when being rotated to the one direction side relative to the planetary gear holding members 5a, 5b.</p> |
