Patent ID: 8840787

Claim:
A filter device, comprising: at least one filter housing; at least one filter cartridge received in said filter housing and extending along a longitudinal axis, said filter cartridge having an end cap on at least one end thereof and filter material with an end edge, said end cap including an enclosure for said end edge, including a connector housing an inner wall with depressions therein and including a bottom, said end cap having an inner sleeve body and an outer sleeve, said inner sleeve body being concentric to said longitudinal axis and forming said inner wall of said connector, said outer sleeve including a hollow cylinder having an axial length greater than an axial length of said inner sleeve body and including an inner end edge projecting over an end edge of said inner sleeve body, said inner end edge of said outer sleeve having an end part extending radially inwardly toward said longitudinal axis adjacent said end edge of said inner sleeve body to border an annular groove between said end part and said end edge of said inner sleeve body, said annular groove seating an annular sealing element; and an element receptacle connected to said filter housing and fixing said filter cartridge in an operating position, said element receptacle having a pipe socket with longitudinal ribs thereon and having spacers engaged with said end cap in the operating position, said depressions and said ribs engaging one another in the operating position to positionally align said filter cartridge with said element receptacle, each said depression having a width greater than a width of each said rib in peripheral direction of said connector and said pipe socket permitting said filter cartridge with said end cap to be slipped onto said pipe socket until said bottom of said end cap contacts said spacers in the operating position.