| 摘要 |
A moveable headrest is equipped with a lower headrest frame shaft fixedly connected to a headrest stay detachably connected to the upper end of the seat back, and a pair of ratchet bases rotatably supported on respective shaft ends of the lower frame shaft. The ratchet bases are coupled with each other at their upper ends through a moveable upper headrest frame. A ratchet-and-pawl mechanism is attached to at least one of the base members for selectively engaging the upper frame with the lower frame shaft and for producing a forward-and-backward angular adjustment of the headrest. The shaft end of the lower frame shaft is formed with an annular stepped portion extending continuously in a peripheral direction of the lower frame shaft nearby the top end, so that the annular stepped portion abuts the inside wall surface of the ratchet base. A pawl bracket is fixedly connected to the shaft end of the lower frame shaft by all-around welding, while sandwiching the ratchet base between the stepped portion and the pawl bracket.
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