| 摘要 |
A filter cartridge ( 20 ) having an upper disc ( 22 ) joined to an upper end of a tubular filter medium ( 21 ) is positioned within a casing ( 11 ) having an upper closure cover ( 12 ). First coupling elements ( 31 ) joined to the cover ( 12 ) and second coupling elements ( 41 ) joined to the upper disc ( 22 ) project axially towards each another to achieve mutual snap-coupling. The first coupling elements ( 31 ) include axially-extending coupling teeth elastic in a radial direction, and the second coupling elements ( 41 ) include a cylindrical surface divided into identical sectors equal to the number of teeth ( 31 ), each sector includes a coupling region ( 43 ) for snap-engaging the coupling teeth ( 31 ) axially, and a disengagement region ( 44 ), positioned to the side of the coupling region ( 43 ), for releasing the coupling teeth ( 31 ) from their engagement with the coupling region ( 43 ) by rotating the cartridge ( 20 ) through a small angle relative to the upper cover ( 12 ).
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