| 摘要 |
The reclining device comprises a pivotal, press-worked arm 2 fixed to a seat back and rotatably supported on a base 1 and having an inner toothed portion 21a. At least one toothed block 12A,B is slidably disposed between the base 1 and the arm 2 and has an outer toothed portion 13 meshable with the inner toothed portion 21a. A rotary cam 16 in cam-connection with the toothed block 12A,B produces an outward or inward sliding motion of the toothed block to mesh or unmesh the outer toothed portion 13 with or from the inner toothed portion 21a by rotation of the cam. To balance two contradictory requirements, that is reduction of undue sink mark (lack of fill) and high mechanical strength (high durability), a reinforced portion 24 of a lack-of-fill suppressive geometry and shape, comprising at least two outside curved faces F 1-3 , is integrally formed with the arm 2 all around circumferentially-extending stepped portion 22 on an outside face opposed to an inside face formed with the inner toothed portion 21a. |
