Land vehicles – Wheeled – Attachment
Reexamination Certificate
1998-09-14
2001-01-16
DePumpo, Daniel G. (Department: 3611)
Land vehicles
Wheeled
Attachment
C280S730100, C280S728200
Reexamination Certificate
active
06173989
ABSTRACT:
FIELD OF THE INVENTION
The invention concerns a tensioning device for a head protection restraining system in vehicles, comprising an inflatable gas bag extending between the A-column and the C-column of the vehicle, one end of which is fastened to the A-column and the other to the C-column.
BACKGROUND OF THE INVENTION
In its inflated state, the gas bag in such a head protection restraining system is tensioned between the A and C columns, since the increase in volume during the inflation process implies a simultaneous contraction in length. In its tensioned state the gas bag ensures lateral support even with burst windowpanes. As a result of unavoidable leakage losses and/or an intentional gas discharge to dissipate impact energy, the gas bag then relaxes so that it regains its original length and its lower edge hangs down loosely.
SUMMARY OF THE INVENTION
The invention provides a tensioning device for a gas bag of the type described, which ensures that the gas bag remains tensioned between the A and C columns of the vehicle even in its vented state.
In accordance with the invention, a tensioned spring is arranged between at least one end of the gas bag and its adjacent column. When the length contraction of the gas bag reduces during the venting process, the tensioned spring accordingly relaxes and automatically compensates for the corresponding increase in length of the gas bag to the required amount, in order to maintain the tension of the lower gas bag edge.
REFERENCES:
patent: 3975258 (1976-08-01), Fox
patent: 5480181 (1996-01-01), Bark et al.
patent: 5588672 (1996-12-01), Karlow et al.
patent: 5788270 (1998-08-01), Haland et al.
patent: 5791683 (1998-08-01), Shibata et al.
patent: 5924722 (1999-07-01), Koide et al.
patent: 5924723 (1999-07-01), Brantman et al.
patent: 5957487 (1999-09-01), Stutz
patent: 5975566 (1999-11-01), Bocker et al.
DePumpo Daniel G.
McClellan James S.
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
TRW Occupant Restraint Systems GmbH & Co. KG
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