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US 11,950,749 B2Granted
Vacuum cleaner filter cartridge
AssigneeNumatic International Limited
InventorsIan Lawrence, Marcus Aston, James Forrest, Ian Bevis
Life of this patent
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AssigneeNumatic International Limited
InventorsIan Lawrence, Marcus Aston, James Forrest, Ian Bevis
Estimating the term…
The present invention relates to the field of machines for cleaning, particularly vacuum cleaning devices. There is disclosed a filter cartridge for a vacuum cleaner comprising first and second opposite end walls, a side wall or walls which extend between the end walls so as to define an enclosure which surrounds a filter interior, wherein one or more of the walls comprises filter membrane material, the cartridge having an opening provided through the first end wall for receiving air-entrained detritus into the interior, the opening being defined by a rigid support structure which spans and supports the first end wall of the cartridge. The cartridge typically includes a non-return valve which closes when suction is removed so as to help prevent collected detritus escaping from the filter cartridge interior. The valve may comprise a conical valve with flexible facets, or a cantilever flap.
A filter cartridge for a vacuum cleaner comprising first and second opposite end walls, a side wall or walls which extend between the end walls so as to define an enclosure which surrounds a filter interior, wherein one or more of the walls comprises filter membrane material, the cartridge having an opening provided through a first end wall for receiving air entrained detritus into the interior, the opening being defined by a rigid support structure which spans and supports the first end wall of the cartridge, wherein structural reinforcement of one or more of the side wall or walls, and/or second end wall, is provided so that the enclosure is self-supporting but collapsible, so that the cartridge may adopt an erect use configuration, and in a collapsed configuration the side wall or walls and second end are drawn together onto the rigid support structure of the first end so as to be flat-packed.
Dependencies are inferred from the claim text.