Safety belt rewinding mechanism with improved retraction charact

Details Safety belt rewinding mechanism with improved retraction charact Safety belt rewinding mechanism with improved retraction charact

1976-12-28

1978-10-31

Hornsby, Harvey C.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

2421074R, A62B 3502, B65H 7548

Patent

active

041230132

ABSTRACT:
Safety belt retractors are disclosed in the form of spring driven belt rewinding mechanisms. In some arrangements, a pair of spiral springs act in series or in parallel, one spring applying a constant rewinding torque to a belt storage shaft, the other storing energy when the belt is withdrawn. A ratchet maintains the stored energy and is disengaged by a screw threaded actuator, which moves coaxially to the storage shaft, when the shaft rotates through a number of revolutions. The stored energy is released to supplement the rewinding torque of the first spring. In another arrangement, the ratchet is replaced by an over center spring assembly. An epicyclic gear box drives a coil spring anchorage through a given arc to give an over center action.

REFERENCES:
patent: 3957222 (1976-05-01), Bladh
patent: 3957283 (1976-05-01), Pocobello
patent: 3984063 (1976-10-01), Knieriemen
patent: 3997126 (1976-12-01), Karlsson

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