Patent ID: 8833858
Filing Date: 2014-09-16
Classification: B60N

Abstract:
1. A reclining mechanism comprising: a ring-shaped first plate fixed to a seat back; a ring-shaped second plate capable of rotating with respect to the first plate and fixed to a seat cushion; a plurality of planetary gears in meshing engagement with internal gears provided in respective inner peripheries of the first plate and the second plate; a sun gear in meshing engagement with the planetary gears; a holding member rotatably holding the planetary gears; and a restriction member for restricting a rotation of the holding member, wherein: the holding member is rotatably disposed in a concave portion formed in a lateral surface of the second plate; and the holding member has an inclined wall portion provided in a part of an outer peripheral surface thereof in spaced-apart opposed relation to an inner peripheral wall of the concave portion, and wherein: the inclined wall portion of the holding member and the inner peripheral wall of the concave portion define therebetween a wedge-shaped space in which the restriction member is displaceably disposed; and the inclined wall portion of the holding member is formed such that a width of the wedge-shaped space is gradually narrowed toward a counter direction with respect to a specific direction, where the specific direction is a direction along which the first plate is urged to be rotated according to a force applied to the seat back in a rearward tilting direction, and the counter direction is a direction opposite to the specific direction.