Seat belt pretensioner

Details Seat belt pretensioner Seat belt pretensioner

1992-12-14

1994-07-05

Jillions, John M.

Winding, tensioning, or guiding

Reeling device

With spring motor

B60R 2246, B65H 7500

Patent

active

053260422

ABSTRACT:
A seat belt pretensioner of the type which rotates the take-up shaft of a retractor in the belt-winding direction so as to wind a length of the belt onto the retractor reel includes a driven gear connected to the retractor take-up shaft and a driving gear connected to a power source, the driving gear normally being held in clearance from the driven gear in the set condition of the pretensioner and being displaced and rotated upon operation of the power source to engage it with the driven gear and to drive the driven gear in rotation. The teeth of one of the gears have addenda that diverge from the addendum circle in the direction of the root circle and in a direction with respect to the direction of rotation of the driving gear such as to facilitate movement of the driving gear into driving engagement with the driven gear in the event of a collision of the addenda of the two gears.

REFERENCES:
patent: 4750686 (1988-06-01), Fohl

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