| 摘要 |
An eccentric cavity is formed between a surrounding surface of a large-diameter hole of a first bracket and an outer circumferential surface of a small-diameter shaft of a second bracket. A pair of wedge members is provided in the eccentric cavity. An operation member pushes the pair of wedge members and the spring member to impart an eccentric motion to the small-diameter shaft in the large-diameter hole and change a mating position between the outer teeth and inner teeth, thereby adjusting the attachment angle of the second bracket. A rolling member is provided in the eccentric cavity for stopping the second bracket from rotating when a force is applied to the seat back in a backward tilting direction, by abutting on at least one of the surrounding surface of the large-diameter hole and the outer circumferential surface of the small-diameter shaft. |
