Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1989-10-03
1991-02-19
Levy, Stuart S.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
2421074R, A67B 3502, B65H 7548
Patent
active
049936573
ABSTRACT:
A seat belt retractor has a first relatively strong spring and a second relatively weak spring which bias the spool of the retractor on which the seat belt is wound in a belt retraction direction. A mechanism is actuatable to block the bias of the first spring from acting on the seat belt so that only the second spring acts to bias the seat belt in the belt retraction direction. The first spring acts between the retractor frame and a ratchet wheel and the second spring acts between the ratchet wheel and the spool of the retractor. A pawl is movable into a first position to block the ratchet wheel from rotation in the belt retraction direction so that only the second spring acts to bias the seat belt in a belt retraction direction. A cam is rotatable relative to the retractor spool and controls movement of the pawl. A cam driver is rotatable with the spool and carries a deflectable part which engages the cam and rotates the cam in belt withdrawal and belt retraction directions to control the position of the pawl. The cam and pawl have parts which cooperate to block rotation of the cam in the belt retraction direction by the cam driver when the pawl is in its second position. When the cam is blocked from rotation in the belt retraction direction, the deflectable part can deflect and rotate past the cam.
REFERENCES:
patent: 4123013 (1978-10-01), Bottrill et al.
patent: 4126282 (1978-11-01), Morita et al.
patent: 4162772 (1979-07-01), Shimogawa et al.
patent: 4212435 (1980-07-01), Kawaharazaki
patent: 4213580 (1980-07-01), Kawaharazaki et al.
patent: 4215830 (1980-08-01), Cunningham
patent: 4303208 (1981-12-01), Tanaka
patent: 4310128 (1982-01-01), Morita et al.
patent: 4383658 (1983-05-01), Morita et al.
patent: 4564153 (1986-01-01), Morinaga et al.
patent: 4711408 (1987-12-01), Mori
patent: 4749141 (1988-06-01), Young
patent: 4809925 (1989-03-01), Takada
Kern and Liebers Document, for "Device For the Automatic Rewinding of a Satety Belt", no date known.
duBois Steven M.
Levy Stuart S.
TRW Vehicle Safety Systems Inc.
LandOfFree
Dual spring retractor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual spring retractor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual spring retractor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1136959