Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1985-12-12
1987-01-13
Levy, Stuart S.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
B60R 2238, B65H 7548
Patent
active
046358749
ABSTRACT:
A seat belt retractor includes a reel rotatably mounted on the frame side walls and having toothed plates disposed adjacent to the side walls and a belt wound on the reel to a diameter greater than the toothed plates. A lock bar extending between the side walls is movable from a rest position spaced away from the toothed plates to a locking position engaging one of the sprocket teeth subsequent to the unwinding of sufficient belt from the reel to decrease the belt diameter to a diameter less than the diameter of the sprocket teeth. A sensor pawl eccentrically mounted on the reel flies out into engagement with inside clutch teeth of an annular clutch member, an annular split clutch ring encircles the outer surface of the annular clutch member and has an actuating arm which actuates the lock bar. The split clutch ring has fingers which seat into teeth provided on the outer surface annular clutch member. These teeth on the inner and outer surfaces are equal in number with the sprocket teeth and angularly related therewith to assure full engagement of the lock bar with the sprocket teeth. If an occupant unwinds the belt from the retractor at a high rate of speed which would initiate retractor lockup before the belt has been sufficiently unwound to expose the toothed plates for engagement by the lock bar, the clutch spring will provide a measured incremental slippage of the locking mechanism to permit continued belt unwinding while still maintaining the desired timing relationship between the sensor mechanism and the lock bar.
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General Motors Corporation
Leahy Charles E.
Levy Stuart S.
Matecki Katherine A.
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