Seat belt webbing pretensioner

Details Seat belt webbing pretensioner Seat belt webbing pretensioner

1997-08-15

1998-12-01

Jillions, John M.

Winding, tensioning, or guiding

Reeling device

With spring motor

60632, B60R 2246

Patent

active

058426574

ABSTRACT:
A vehicle seat belt webbing retractor (10) including a pretensioner (61), includes a length of seat belt webbing (16) and a spool (50) on which the seat belt webbing is wound. The spool (50) is rotatable in a belt retraction direction (56) and in an opposite belt withdrawal direction (58). The retractor (10) includes a member (70) having a chamber (100), a fixed portion (98), and a movable portion (88). The fixed portion (98) of the member (70) is fixed in position relative to the spool (50). The member (70) has a first condition in which the movable portion (88) of the member is twisted in a first direction of rotation about an axis (72) relative to the fixed portion (98) of the member. The movable portion (88) of the member (70) untwists in a second direction of rotation about the axis (72) relative to the fixed portion (98) of the member in response to the introduction of fluid under pressure into the chamber (100) of the member. The retractor (10) includes a mechanism (64, 66, 68) for transmitting torque from the movable portion (88) of the member (70) to the spool (50) to effect rotation of the spool in the belt retraction direction (56).

REFERENCES:
patent: 3766803 (1973-10-01), Ball, Jr. et al.
patent: 4191344 (1980-03-01), Tillac
patent: 5033270 (1991-07-01), Hardt
patent: 5443222 (1995-08-01), Modinger, et al.
Article entitled "Introduction to a new Pressure Transducer Technology", 9 pages.

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