Seat belt retractor with a cinch mechanism

Details Seat belt retractor with a cinch mechanism Seat belt retractor with a cinch mechanism

1995-03-17

1996-09-10

Jillions, John M.

Winding, tensioning, or guiding

Reeling device

With spring motor

280807, B60R 22343, B60R 22353

Patent

active

055538045

ABSTRACT:
A seat belt retractor (10) comprises a rotatable spool (16) with seat belt webbing (18) wound around the spool. The spool (16) has a longitudinal central axis and is rotatable in a belt unwinding direction (20) about its longitudinal central axis to enable the seat belt webbing (18) to be extended about a vehicle occupant. An actuatable locking mechanism (60), when actuated, prevents the spool (16) from rotating in the belt unwinding direction (20). A toothed wheel (24) is rotatable with the spool (16) about the longitudinal central axis of the spool. The toothed wheel (24) includes at least one coded tooth (26') comprising magnetic material. A pair of magnetic sensors (30, 35) cooperates to sense rotation of the coded tooth (26') about the longitudinal central axis of the spool (16). The locking mechanism (60) actuates to prevent the spool (16) from rotating in the belt unwinding direction (20) when the magnetic sensors (30, 35) provide signals indicating that the coded tooth (26') and the spool have rotated a predetermined number of revolutions in the belt unwinding direction.

REFERENCES:
patent: 3866854 (1975-02-01), Wehner
patent: 3967794 (1976-07-01), Fohl
patent: 4519652 (1985-05-01), Kamijo
patent: 4566649 (1986-01-01), Petersen, III
patent: 4678134 (1987-07-01), Ameur
patent: 4895317 (1990-01-01), Rumpf et al.

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