Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1985-03-06
1986-01-21
Jillons, John M.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
A62B 3502, B65H 7548
Patent
active
045653380
ABSTRACT:
A seat belt retractor comprises a belt reel rotatably mounted in a frame, a ratchet wheel coupled to the belt reel for rotation therewith, and a pawl supported on the frame for movement between locking and unlocking positions with the ratchet wheel. A mechanism responsive to rotational acceleration of the belt reel above a selected level moves the pawl to the locking position. A mechanism responsive to a selected amount of rotation of the belt reel in the belt-unwinding direction automatically urges the pawl resiliently to the locked position. This mechanism also responds to a selected amount of rewinding of the belt by automatically urging the pawl resiliently to the unlocked position. The aforementioned mechanism includes a pivotable actuator engageable with the pawl in the locked and unlocked positions through a lost motion coupling, an over-center spring biasing the actuator toward said engagements while allowing lost motion, whereby the pawl can move between the locked and unlocked positions against the bias of over-center spring, and a reduction mechanism coupled to the reel and including a rotatable output member having two circumferentially spaced-apart lugs, one of which engages and moves the actuator to one over-center position upon unwinding of the belt and the other of which engages and moves the actuator to the other over-center position upon rotation of the belt in the belt-winding direction.
REFERENCES:
patent: 3862726 (1975-01-01), Ulrich et al.
patent: 4171782 (1979-10-01), Rumpf
patent: 4436255 (1984-03-01), Matsui et al.
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