Land vehicles – Wheeled – Attachment
Patent
1993-01-11
1994-05-10
Tyson, Karin L.
Land vehicles
Wheeled
Attachment
297480, B60R 2246
Patent
active
053102193
ABSTRACT:
A belt pretensioner comprising a pyrotechnical piston/cylinder drive has a vehicle-sensitive mass which is formed by a pivotally mounted base (14), a gas generator (18) inserted therein and a piston/cylinder unit (20). To ensure free pivotability of the base (14), the piston (24) is accommodated in the cylinder (22) with axial and radial clearance. The piston (24) is provided with an annular groove (50) in which an annular seal (52) is arranged. When not subjected to the gas pressure from the gas generator, the annular seal (52) is not in contact with the inner wall of the cylinder (22). Under the gas action the annular seal (52) is moved axially along the conically rising bottom (56) of the annular groove (50) and at the same time radially expanded until it comes into sealing engagement with the inner wall of the cylinder (22).
REFERENCES:
patent: 3917031 (1975-11-01), Doin et al.
patent: 3982775 (1976-09-01), Lindblad
patent: 4258934 (1981-03-01), Tsuge et al.
patent: 4288098 (1981-09-01), Tsuge et al.
patent: 4458921 (1984-07-01), Chiba et al.
patent: 4767161 (1988-08-01), Sedlmayr et al.
patent: 5037134 (1991-08-01), Tabata
patent: 5104193 (1992-04-01), Fohl
European Search Report EP 93100494.9.
TRW (Repa) GmbH
Tyson Karin L.
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