Filtration device in the form of a one-part cartridge intended for pyrotechnic generators
First Claim
1. A gas-filtering device formed as an axisymmetrical, unitary cartridge and comprising:
- a rigid ring including an axisymmetrical lateral wall terminating in first and second flanged ends, and a plurality of openings formed in the lateral wall and positioned between the first and second flanged ends;
a gas-permeable backing piece overlying the lateral wall and terminating in first and second edge portions, wherein first edge portions of the backing piece are in contact with a first flanged end of the rigid ring and second edge portions of the backing piece are crimped to a second flanged end of the rigid ring; and
filter elements enclosed between the rigid ring and the backing piece.
2 Assignments
0 Petitions
Accused Products
Abstract
Gas-filter in the form of an axisymmetric one-part cartridge (1), characterised in that it is essentially constituted by:
a) a rigid ring (2) comprising an axisymmetric lateral wall (21) bounded by a flat-forming extremity (23) and by another, fold-down extremity (24), openings (22) being disposed on the wall (21) between the extremities (23) and (24),
b) a gas-impermeable backing piece (3) surrounding on the outside the lateral wall (21) of the ring (2) by bearing on the plane extremity (23) of the ring (2) and crimped into the fold-down extremity (24) of the ring (2),
c) filter elements (4) disposed between the ring (2) and the backing piece (3).
31 Citations
27 Claims
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1. A gas-filtering device formed as an axisymmetrical, unitary cartridge and comprising:
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a rigid ring including an axisymmetrical lateral wall terminating in first and second flanged ends, and a plurality of openings formed in the lateral wall and positioned between the first and second flanged ends; a gas-permeable backing piece overlying the lateral wall and terminating in first and second edge portions, wherein first edge portions of the backing piece are in contact with a first flanged end of the rigid ring and second edge portions of the backing piece are crimped to a second flanged end of the rigid ring; and filter elements enclosed between the rigid ring and the backing piece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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- 18. A pyrotechnic gas generator comprising a bottom and a cover assembled to form concentric chambers including at least one centrally disposed combustion chamber in communication with a peripheral annular filter chamber, wherein the combustion chamber and the filter chamber are separated by a continuous partition incorporating a plurality of orifices for connecting the chambers, and wherein the annular filter chamber contains a gas-filtering device formed as an axisymmetrical, unitary cartridge and including a rigid ring having an axisymmetrical lateral wall terminating in first and second flanged ends, and a plurality of openings formed in the lateral wall and positioned between the first and second flanged ends, a gas-permeable backing piece overlying the lateral wall and terminating in first and second edge portions, wherein first edge portions of the backing piece are in contact with a first flanged end of the rigid ring and second edge portions of the backing piece are crimped to a second flanged end of the rigid ring, and filter elements enclosed between the rigid ring and the backing piece.
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21. A gas-filtering device formed as an axisymmetrical, unitary cartridge and consisting essentially of:
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a rigid ring including an axisymmetrical lateral wall terminating in first and second flanged ends, and a plurality of openings formed in the lateral wall and positioned between the first and second flanged ends; a gas-permeable backing piece overlying the lateral wall and terminating in first and second edge portions, wherein first edge portions of the backing piece are in contact with a first flanged end of the rigid ring and second edge portions of the backing piece are crimped to a second flanged end of the rigid ring; and filter elements enclosed between the rigid ring and the backing piece.
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22. A process for manufacturing a gas-filtering device, comprising the steps of:
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forming a rigid ring with an axisymmetrical lateral wall terminating in first and second flanged ends, and with a plurality of openings in the lateral wall and positioned between the first and second flanged ends; positioning a plurality of filter elements around outer surface portions of the lateral wall of the rigid ring; placing a gas-permeable backing piece terminating in first and second edge portions over the filter elements and the lateral wall of the rigid ring so that first edge portions of the backing piece are in contact with a first flanged end of the rigid ring, and crimping second edge portions of the backing piece to a second flanged end of the rigid ring, forming an axisymmetrical, unitary cartridge. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification