Winding spring especially for seat belt retractor

Details Winding spring especially for seat belt retractor Winding spring especially for seat belt retractor

1982-03-26

1984-02-07

Christian, Leonard D.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

2421077, B65H 7548

Patent

active

044298404

ABSTRACT:
A rewind spring motor assembly, useful in a seat belt retractor, including a drive spool and an idler spool, and a rewind spring having a stretched S-shape between the spools. The spring has a normal use region extending from the drive spool towards the idler spool and includes a first portion having a first natural radius of curvature and a second portion having a second natural radius of curvature greater than the first natural radium of curvature. The transition between the first and second portions is defined by an abrupt increase in the natural radius of curvature. In use in a seat belt retractor, this abrupt increase results in an abrupt change in the extraction and retraction forces, so that a wearer definitely notices a reduced rewind force. Also, in the rewind mode, the abrupt increase in rewind force assists full stowing of the seat belt webbing on the retractor.

REFERENCES:
patent: 3251627 (1966-05-01), Fisher
patent: 4084764 (1978-04-01), Mogerlein et al.
patent: 4253620 (1981-03-01), Takei et al.
patent: 4301977 (1981-11-01), Yang

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