Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1978-05-19
1981-10-06
McCall, James T.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
280806, 297475, 297478, B65H 7548, A62B 3500
Patent
active
042931053
ABSTRACT:
A reel type safety seat belt retractor in which a pawl is triggered to engage a ratchet wheel, serving as a reel flange, by an inertial device sensitive to an accelerated movement of the reel, wherein the inertial device has two levels of sensitivity, a low level to prevent the triggering of the pawl under all normal conditions of belt withdrawal for buckling, and a second level of high sensitivity which prevails after the belt webbing has been buckled about the passenger.
This is accomplished by means of a biasing spring shared by both a webbing follower and the inertial device, and by a clutch which rotated when the webbing in initially withdrawn to restrain the webbing follower and the attached spring bias in a condition of high tension for the low level of sensitivity. When the clutch rotates to release the webbing follower as the belt is buckled, the follower moves toward the diminished roll of webbing, reducing the tension on the shared spring bias and providing a high level of sensitivity for the protection of the buckled passenger.
REFERENCES:
patent: 3741496 (1973-06-01), Beller
patent: 3797603 (1974-03-01), Loomba
patent: 3817473 (1974-06-01), Board et al.
patent: 3822046 (1974-07-01), Baelder
patent: 3862726 (1975-01-01), Ulrich
patent: 3865329 (1975-02-01), Higbee et al.
patent: 3926385 (1975-12-01), Board et al.
Allied Chemical Corporation
Criss Roger H.
McCall James T.
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