| 摘要 |
A seat reclining mechanism comprising an upper bracket adapted to be secured to a seat back of a seat assembly, a lower bracket adapted to be secured to a seat cushion of the seat assembly, an internal gear provided on the upper bracket, an external gear provided on the lower bracket and adapted for meshing engagement with the internal gear the external gear being smaller in number of gear teeth than the internal gear. An eccentric shaft is provided and has a shaft portion journalling the external gear and an eccentric portion journalling the internal gear so that the gears are engaged with each other at a circumferential position. The eccentric shaft is journalled through a bearing on the lower bracket, and a manually operable knob shaft is rotatably carried by the lower bracket. A rotation transmitting mechanism is provided between the knob shaft and the eccentric shaft for transmitting rotation of the knob shaft to the eccentric shaft. A rotation restricting device is provided between the knob shaft and the lower bracket for restricting the knob shaft against rotation under a force applied from the eccentric shaft but permitting a rotation of the knob shaft under a manual actuating force directly applied thereto.
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