| 摘要 |
A retractor comprises a frame, and a locking mechanism having an inner disc mounted on a portion of the shaft for axial movement, an inertia spring which normally holds the inner disc in an outward position in which the mechanism is unlocked, and an outer disc mounted on the shaft and restrained against axial movement in a direction away from the frame side member. One of the two discs is rotatable relative to the shaft, while the other disc is rotatabley fixed to the shaft and drives the rotatable disc through coacting cam elements on the inner and outer disc.
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