Land vehicles – Wheeled – Attachment
Reexamination Certificate
1999-06-11
2001-05-22
Johnson, Brian L. (Department: 3618)
Land vehicles
Wheeled
Attachment
Reexamination Certificate
active
06234522
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a hybrid gas generator for an air bag.
From EP 0 616 578 B1 a hybrid gas generator of the generic type with a storage chamber for gas is known, with the storage chamber being sealed by a first bursting disk. An ignitable, gas-generating solid fuel charge is arranged in a combustion chamber. A separating wall, which limits the combustion chamber and which can be torn away, is connected to a hollow sliding piston for piercing the first bursting disk. A second bursting disk is arranged in the separating wall between the combustion chamber and the cavity of the sliding piston. Upon the ignition of the gas-generating solid fuel charge, the separating wall with the sliding piston tears away from the combustion chamber as a result of the pressure which builds up, and the point of the sliding piston punctures the first bursting disk to the storage chamber. Thereupon, cold gas can reach a gas bag by way of exit openings. The second bursting disk in the separating wall bursts under the pressure which continues to build up in the combustion chamber, and hot gas flows into the storage chamber and heats the stored gas there.
A disadvantage of this is the very costly construction which makes economical manufacture difficult.
SUMMARY OF THE INVENTION
The object of the invention is to construct a hybrid gas generator more simply and therefore more economically. The gas generator should only consist of a few assemblable modules.
In accordance with the invention, the object is achieved
by the solid fuel charge being arranged in a pyrotechnic cartridge which can be installed separately,
by the separating wall forming the front boundary of the cartridge,
by a peripheral chamfer being arranged as predetermined breaking point on the peripheral wall of the cartridge for the tearing-off of the separating wall and
by the second bursting disk being a thinning in the separating wall.
By means of these measures, the sliding piston with the pyrotechnic cartridge is integrated in simple construction to form a module.
In an advantageous development, the peripheral wall of the cartridge rises above the separating wall as an axially extended holding band, and the sliding piston is embedded with its end which faces the separating wall between the separating wall and the holding band.
This embedding can be effected in two advantageous ways. In a first embodiment, the sliding piston has at its end facing the separating wall a peripheral groove, into which the holding band is pressed or rolled. In a second embodiment, the sliding piston is connected to the separating wall by means of beading of the holding band around the end of the sliding piston which faces the separating wall.
So that the sliding piston is stopped in its extended position after the first bursting disk has been punctured, the sliding piston is conically constructed at its end which faces the separating wall, with an excess which is radial with respect to the diameter of the piston guide mechanism.
REFERENCES:
patent: 5226667 (1993-07-01), Coultas
patent: 5564740 (1996-10-01), Zakula
patent: 5630619 (1997-05-01), Buchanan et al.
patent: 5709406 (1998-01-01), Buchanan
patent: 5934705 (1999-08-01), Siddiqui et al.
patent: 5970880 (1999-10-01), Perotto
patent: 19653783 (1998-06-01), None
patent: 98/28169 (1998-07-01), None
Albrecht Uwe
Bretfeld Anton
Kraft Hosef
Zhang Jiang
Antonelli Terry Stout & Kraus LLP
Dynamit Nobel GmbH Explosivstoff-und Systemtechnik
Fischmann Bryan
Johnson Brian L.
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