Allied Corporation

Jai H Chawla

Arduino Colasanti

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.

Growing community of inventors

Knoxville, TN, United States of America

Jai H Chawla