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US 5,308,370 AGranted
Filter device for filtering a gas flow
AssigneeDynamit Nobel Aktiengesellschaft
InventorsJosef Kraft, Gerrit Scheiderer
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AssigneeDynamit Nobel Aktiengesellschaft
InventorsJosef Kraft, Gerrit Scheiderer
Estimating the term…
A filter device for filtering a gas flow, especially for filtering the gases produced by a gas generator for an impact protection cushion, comprises a filter element exhibiting several filter material plies of varying permeability lying in series in the flow direction. The filter element is fashioned as a wrapped member produced by winding up a length of filter material. The length of filter material has sectionally different filter materials, preferably wire mesh of differing mesh widths and metal fiber mats. A wrapped member is formed by winding up this filter material web, the wrapping plies of which consist of different materials with varying filter effects. This filter element wrap is inserted, for example, in the annular interspace between the two tubes of a double-tube gas generator. Owing to the rising pressure of the gas to be cleaned, the wrapped member is compacted with the consequence that its filtering function is improved.
A filter device for filtering a gas flow of gases produced by a tubular gas generator for inflating an impact protection cushion, comprising
A filter device according to any one of claims 114 3, wherein the length of the filter material web comprises a first and a second ply of filter material, the first ply consisting throughout of a first filter material section, and the second ply comprising at least one second filter material.
An assembly of a filter device and tubular gas generator, said gas generator comprising a perforated inner tube, a perforated outer tube arranged coaxially with the inner tube and having a diameter greater than the inner tube, sealing mean for sealing each axial end of the inner and outer tubes, a gas-generating material located in the inner tube and means for igniting the gas-generating material to generate pressurized gases;
Dependencies are inferred from the claim text.