Vehicle seat belt retractor

Details Vehicle seat belt retractor Vehicle seat belt retractor

1992-07-01

1993-09-28

Jillions, John M.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

280806, B60R 2246

Patent

active

052481107

ABSTRACT:
A vehicle seat belt pretensioner comprises a rotary piston/cylinder drive mechanism (4, 5) arranged to be coupled to a reel to rotate the reel in a direction to wind a seat belt onto it upon delivery into an annular cylinder chamber of the piston/cylinder of a gas under pressure from a gas generator (8). The drive mechanism includes a ratchet wheel (3) affixed to the reel and received rotatably within a cylindrical sleeve portion (51) of the piston (5) of the piston/cylinder. A locking bullet (7) is displaceably mounted in an opening in the sleeve portion of the piston for movement by the force due to gas under pressure supplied to the chamber from the gas generator generally radially from an outer inactive position in which rotation of the ratchet wheel and the reel are permitted to an inner locking position in which it engages a tooth of the ratchet wheel to couple the piston to the reel so as to rotate the reel in a direction to wind a length of the belt webbing onto the reel.

REFERENCES:
patent: 4014479 (1977-03-01), Nilsson et al.
patent: 4151967 (1979-05-01), Lindblad
patent: 4230288 (1980-10-01), Fohl
patent: 4455000 (1984-06-01), Nilsson
patent: 4558832 (1985-12-01), Nilsson
patent: 4597586 (1986-07-01), Burghardt et al.

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