| 摘要 |
A seat reclining device has a base plate secured to a seat cushion, an arm member secured to a seat back, upper and lower tooth plates pivotally mounted on a base plate and provided with upper and lower teeth, a cam member pivotally mounted on the base plate, and at least one support for the lower tooth plate. When the cam member moves the lower tooth plate in a direction to bring the lower teeth into contact with the upper teeth, the upper tooth plate is locked together with the arm member so that the seat back becomes unable to pivot relative to the seat cushion. In such a locked condition, the support supports the end portion of the lower tooth plate so as to maintain the engagement of the upper and lower teeth. Thus, the seat reclining device can lock the seat back with improved strength.
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