Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1985-12-12
1987-02-03
Levy, Stuart S.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
2421075, B65H 7548
Patent
active
046404724
ABSTRACT:
A seat belt retractor according to the present invention includes a belt reel rotatably mounted on the side walls of a frame by a reel shaft. The reel is biased in the belt winding direction by a windup spring such as a clock spring or spiral spring having its inner end attached to the reel shaft and its outer end mounted on a gear which is coupled to the reel by a reduction gear arrangement by which the gear makes less than one revolution during the plurality of revolutions of the reel experienced during belt unwinding from the fully retracted condition to the fully extended condition for buckling about the occupant. The outer end of the winding spring is mounted on the gear at a location furthest away from the inner end of the spring so that during the plurality of belt unwinding revolutions of the inner end of the spring the outer end of the spring chases the inner end of the spring in the direction to relieve the force on the spring and also moves closer to the inner end of the spring so that the torque acting on the reel via the lever arm provided by the gear progressively increases during belt unwinding to lessen the belt winding effort imposed on the belt by the spring.
REFERENCES:
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patent: 3682412 (1972-08-01), Kuszynski
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patent: 4036449 (1977-07-01), Schreiber
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patent: 4216922 (1980-08-01), Weman
patent: 4301977 (1981-11-01), Yang
patent: 4427163 (1984-01-01), Kondziola
General Motors Corporation
Leahy Charles E.
Levy Stuart S.
Matecki Katherine
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