| 摘要 |
A rotary-cam type reclining device comprises a base fixedly connected to a seat cushion, a toothed arm fixedly connected to a seat back and rotatably supported on the base via a pivot, a toothed block slidably disposed between the base and the arm and having an outer toothed portion and a cam-contour surface and slidably guided by two parallel side walls of a recessed toothed-block guide defined in the base, a rotary cam for producing outward and inward sliding motions of the toothed block to mesh and unmesh the outer toothed portion of the toothed block with and from the inner toothed portion of the arm by a rotary motion of the cam, and an operating lever mechanically linked to the cam for producing the rotary motion of the cam. In a completely-locked state of the device, the toothed block is held at its outermost meshing position by way of three cam-connection points created between the cam-profile surface of the cam and the cam-contour surface of the toothed block for restricting or preventing the movement of the toothed block in all directions of the toothed block.
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