Magnetically controlled retractor

Motor vehicles – With belt or harness for restraining occupant – and means... – System comprises ignition circuit or starter circuit or...

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Details

280806, B60R 2100

Patent

active

055380980

ABSTRACT:
A device (10) has a spool (20) for storing a seat belt (28) wound on the spool (20). The spool (20) is rotatable about an axis (22) in belt withdrawal (A) and belt retraction (B) directions. A ratchet wheel (24) is fixed for rotation with the spool (20). A movable pawl (32) has a blocking position for blocking the ratchet wheel (24) and the spool (20) against rotation in the belt withdrawal direction (A) and a release position for permitting rotation of the ratchet wheel (24) and the spool (20) in the belt withdrawal direction (A). A permanent magnet (46) is attached to the pawl (32) for movement with the pawl (32). A control means (30) controls movement of the permanent magnet (46) and the pawl (32) between the release and blocking positions. The magnetic control means (30) includes a first magnetic biasing means (58) for biasing the permanent magnet (46) and the pawl (32) toward the blocking position. The magnetic control means (30) also includes a second magnetic biasing means (52) for biasing the permanent magnet (46) and the pawl (32) toward the release position. The second magnetic biasing means (52) is preferably an electromagnet, and the flow of electrical energy to the electromagnet is controlled by an actuator mechanism (60) that may include an inertia sensor assembly (62) and a timer (86).

REFERENCES:
patent: 3952966 (1976-04-01), Burleigh
patent: 4136328 (1979-01-01), Cambern
patent: 4345665 (1982-08-01), Fohl
patent: 4895317 (1990-01-01), Rumpf et al.
patent: 4896742 (1990-01-01), Shitanoki et al.
patent: 5165498 (1992-11-01), Garboli et al.

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