Safety belt retractor

Winding – tensioning – or guiding – Strand tensioning device – Tortuous course

Patent

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Details

2421074A, B65H 7548

Patent

active

045641544

ABSTRACT:
A safety belt retractor comprises a takeup shaft rotatably journalled on a frame and normally biased to wind a safety belt therearound. The shaft carries a coaxial, fixed ratchet wheel, a coaxial, rotatable inertia member, and a clutch mechanism composed of a lock ring coaxially and rotatably mounted on the takeup shaft and normally spring-biased to rotate in a belt-winding direction, the lock ring having internal teeth and a cam slot. A clutch engagement mechanism engages the internal teeth of the lock ring to couple the lock ring with the takeup shaft when there is a difference between the speeds of rotation of the takeup shaft and the inertia member. A pawl is pivotably supported on the frame and includes a cam follower received in the cam slot in the lock ring. The pawl is pivotably movable into an operative position in which it engages the ratchet wheel in response to rotation of the lock ring in the belt-unwinding direction when the lock ring is coupled to the takeup shaft, and is also pivotably movable into an original position in response to rotation of the lock ring in the belt-winding direction when the lock ring is uncoupled from the takeup shaft. The cam slot includes an extension portion for allowing the lock ring to rotate in a belt-unwinding direction without moving the cam follower in a direction to disengage the pawl from the operative position.

REFERENCES:
patent: 3632058 (1972-01-01), Stoffel
patent: 3822840 (1974-07-01), Stephenson
patent: 4083512 (1978-04-01), Rumpf
patent: 4099685 (1978-07-01), Paitula
patent: 4190213 (1980-02-01), Ueda
patent: 4386745 (1983-06-01), Patel et al.

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