Tension reducing retractor with reduced velocity ratchet

Details Tension reducing retractor with reduced velocity ratchet Tension reducing retractor with reduced velocity ratchet

1995-02-21

1996-07-16

Jillions, John M

Winding, tensioning, or guiding

Reeling device

With spring motor

B60R 2244

Patent

active

055359590

ABSTRACT:
A seat belt retractor (10) includes a seat belt storage spool (14) on which a seat belt (16) is wound. The spool 14 is rotatable in belt retraction and belt withdrawal directions (A, B). First and second springs (50, 52) act in series and bias the spool (14) to rotate in the belt retraction direction. A ratchet wheel (54) is connected between the first and second springs (50, 52) and blocks the spring force of the first spring (50) from biasing the spool (14) in the belt retraction direction. The ratchet wheel (54) has a plurality of teeth (78). The ratchet wheel (54) is rotatable when blocking of the spring force of the first spring (50) does not occur and is stationary when blocking does occur. A pawl (56) is movable by an actuator (60) for selectively engaging a tooth (78) of said ratchet wheel (54) to prevent rotation of said ratchet wheel (54). An inertia mass member (81) is mounted on the ratchet wheel (54) to increase the overall rotational inertia of the ratchet wheel (54) and thereby retard the rotational velocity of the ratchet wheel (54) upon release of the pawl (56) from the ratchet wheel (54).

REFERENCES:
patent: 4162772 (1979-07-01), Shimogawa et al.
patent: 4711408 (1987-12-01), Mori
patent: 4763853 (1988-08-01), Andersson
patent: 4768733 (1988-09-01), Willey
patent: 4989804 (1991-02-01), Ebner et al.
patent: 5080298 (1992-01-01), Sasaki et al.
patent: 5255868 (1993-10-01), Reulein
patent: 5297752 (1994-03-01), Brown et al.

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