Retractor provided with a take-up force reducing mechanism

Details Retractor provided with a take-up force reducing mechanism Retractor provided with a take-up force reducing mechanism

1980-09-17

1982-08-24

Jillions, John M.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

2421074R, A62B 3500, B65H 7548

Patent

active

043457231

ABSTRACT:
A seat belt retractor is provided with a take-up force reducing mechanism which has two spiral springs at least one of which acts for webbing take-up and in which the webbing take-up force can be reduced by controlling at least one of the two spiral springs. The retractor comprises a cam formed integrally with a take-up shaft and having a small-diametered circular cam portion, a large-diametered circular cam portion and a spiral cam portion interconnecting said circular cam portions, a follower member adapted to follow the cam portions of the cam and during webbing pay-out, to move from one of the small-diametered and the large-diametered cam portion to the other via the spiral cam portion and during webbing rewind, to move from said other cam portion to said one cam portion via the spiral cam portion, and spring force controlling means for reducing the take-up force when the follower member is following the spiral cam portion.

REFERENCES:
patent: 4120467 (1978-10-01), Stephenson
patent: 4162772 (1979-07-01), Shimogawa et al.
patent: 4198011 (1980-04-01), Kamijo et al.

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