| 摘要 |
<p>A seat reclining apparatus including a base member, a rotatable cover member with an internal tooth gear, three tooth plates with external tooth gears, a pivotable cam member on an inner peripheral side of the tooth plates, a biasing member biasing each of the tooth plates, three guide projections projecting from the tooth plates toward the cover member, an annular grooved portion in the cover member, and three guide surfaces whose one or two being formed on an inner peripheral wall surface of the annular grooved portion, the remainder of the three guide surfaces being formed on the outer peripheral wall surface thereof, wherein the three guide surfaces serve to restrain displacement of the three tooth plates toward the lock position when the respective guide projections are allowed to run upon the corresponding guide surfaces.</p> |
