Abstract: A seat belt retractor is of a type having an emergency locking mode and an auto-locking mode. The retractor comprises a take-up shaft on which a webbing is wound. A ratchet wheel is connected to the take-up shaft to rotate therewith, and an annular cam member is connected to the take-up shaft through a speed reduction mechanism. The cam member has a first group of projections formed thereon. A switching arm is pivotally arranged in such a manner that a second group of projections formed thereon are engageable with the first group of projections. A toggle spring is used for biasing the switching arm in a given direction. A pivotal tooth member is actuated by the switching arm and engageable with the ratchet wheel. The pivotal tooth member is biased by a spring in a direction away from the ratchet wheel.

Abstract: A noiseless emergency locking type retractor for a seat belt is disclosed. The retractor comprises a housing; a shaft rotatably received in the housing for selectively winding and unwinding the seat belt thereabout and therefrom; an emergency locking device including a stand-man holder tightly held by the housing, a stand-man operatively held by the holder and a pivotal lever member, the pivotal lever member locking the shaft against rotation in a direction to draw the seat belt therefrom when the stand-man is inclined relative to the stand-man holder; and a structure mounted to the housing to define a sound insulating enclosed space in which the stand-man and the pivotal lever member are installed.