Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1975-10-24
1976-10-05
Gilreath, Stanley N.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
185 9, 2421074R, A62B 3500, B65H 7548, F03G 100
Patent
active
039840638
ABSTRACT:
A seat belt retractor has a primary winding spring which is wound up during belt unwinding reel rotation to store energy for biasing the reel in the belt winding direction. An assist spring acts between the reel and an assist spring housing which is mounted for rotation relative both the retractor housing and the reel. A lock lever is pivotally mounted on the assist spring housing and is movable to a first position connecting the assist spring housing with the retractor housing so that the assist spring is wound up during belt unwinding reel rotation to store energy for biasing the reel in the belt winding direction and a second position connecting the assist spring housing with the reel so that the assist spring is maintained at its then existing state of wind up and has no biasing affect on the reel. A lock operating mechanism is provided which senses the extent of belt unwinding and moves the locking lever between the first and second positions in response to the extent of belt unwinding so that during belt unwinding within a predetermined range relative the limit of belt winding, the lock lever is in the first position to effect wind up of the assist spring and assist the primary spring in biasing the reel in the belt winding direction. The lock lever is moved to the second position upon belt unwinding beyond the predetermined range so that the assist spring is maintained at its then existing state of wind up with no biasing affect on the reel.
REFERENCES:
patent: 703373 (1902-07-01), Bender
patent: 2131223 (1938-09-01), Earll
patent: 3007653 (1961-11-01), Becker
patent: 3040139 (1962-06-01), Appleton
patent: 3337155 (1967-08-01), Binding
General Motors Corporation
Gilreath Stanley N.
Jillions John M.
Leahy C. E.
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