Pretensioner for webbing retractor

Details Pretensioner for webbing retractor Pretensioner for webbing retractor

1999-04-22

2000-07-18

Jillions, John M.

Winding, tensioning, or guiding

Reeling device

With spring motor

280806, 60632, B60R 2246

Patent

active

06089492&

ABSTRACT:
A pretensioner for a webbing retractor is provided with a cylinder into which gas is supplied thereby moving a piston. A rack thus causes a pinion to rotate which causes a webbing to be wound onto a winding shaft. During the assembly process for the pretensioner, an O ring is fitted onto a seal holding portion of a piston and the O ring and piston are inserted together into a cylinder. Therefore, the conventional cutting process for forming a seal holding groove is unnecessary. In a normal state, the piston does not come into direct contact with the bottom portion of the cylinder, as in a conventional apparatus, instead the O ring abuts the bottom portion of the cylinder. Therefore, noise generated by the bottom of the cylinder coming into contact with the piston due to vibration and the like can be prevented.

REFERENCES:
patent: 5037134 (1991-08-01), Tabata
patent: 5553890 (1996-09-01), Buhr et al.
patent: 5906327 (1999-05-01), Chamings

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