Cold-gas pyrotechnic generator
First Claim
1. Cold-gas pyrotechnic generator (1) comprising a casing (2) of revolution having a central axis, said casing being provided with outer orifices (22) and including a base (10) and a cover (20) fastened together transversely, said base (10) and said cover (20) together forming:
- an inner ignition channel (80) into which an ignition device (80) is placed;
an annular intermediate chamber (70) employed as a combustion chamber and containing elements (40) of a gas-generating pyrotechnic composition;
an annular peripheral chamber (60) employed as a cooling and filtering chamber, said peripheral chamber containing filtering means;
wherein said intermediate chamber and said peripheral chamber are in communication through intermediate orifices (24) therebetween, and said peripheral chamber is in communication with the outside through said outer orifices (22), and wherein said casing (2) defines, between said inner ignition channel (80) and said intermediate chamber (70), a lateral opening (71) whose height is greater than the largest dimension of said elements of gas-generating pyrotechnic composition, wherein said lateral opening (72) is continuous about said central axis.
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Accused Products
Abstract
The invention relates to a cold-gas pyrotechnic generator, in particular intended for automobile safety, as well as a method for manufacturing this generator.
The generator according to the invention comprises a casing (2) of revolution consisting of a base (10) and a cover (20) establishing:
a central channel (80) in which an ignition device is placed,
an annular intermediate chamber (70) containing elements (40) of a gas-generating pyrotechnic composition,
a peripheral annular chamber (60) containing a filter.
A continuous lateral opening (71) is provided between the central channel (80) and the intermediate chamber (70).
The method for manufacturing a generator of this type consists in assembling the cover (20) with the base (10) containing the filter by friction welding, in placing the casing (2) thus formed onto a lathe and in introducing, after setting in rotation, the pyrotechnic elements (40) into the chamber (70) through the opening (71) and, lastly, in installing the ignition device.
The invention thus enables the welding of the casing of the generator to be carried out in the absence of any pyrotechnic element.
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Citations
7 Claims
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1. Cold-gas pyrotechnic generator (1) comprising a casing (2) of revolution having a central axis, said casing being provided with outer orifices (22) and including a base (10) and a cover (20) fastened together transversely, said base (10) and said cover (20) together forming:
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an inner ignition channel (80) into which an ignition device (80) is placed; an annular intermediate chamber (70) employed as a combustion chamber and containing elements (40) of a gas-generating pyrotechnic composition; an annular peripheral chamber (60) employed as a cooling and filtering chamber, said peripheral chamber containing filtering means; wherein said intermediate chamber and said peripheral chamber are in communication through intermediate orifices (24) therebetween, and said peripheral chamber is in communication with the outside through said outer orifices (22), and wherein said casing (2) defines, between said inner ignition channel (80) and said intermediate chamber (70), a lateral opening (71) whose height is greater than the largest dimension of said elements of gas-generating pyrotechnic composition, wherein said lateral opening (72) is continuous about said central axis. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification