Patent ID: 8282700

Claim:
A filter device for filtering a fluid, the filter device comprising: a filter housing assembled of housing parts, wherein said filter housing has an inlet for a fluid to be filtered and an outlet for filtered fluid; a filter element arranged in said filter housing such that said inlet is separated seal-tightly from said outlet; and a releasable anchoring device configured and adapted to connect said housing parts relative to each other; wherein said anchoring device comprises a rotary insert having a guide and anchoring section; and a receptacle interacting positive-lockingly with said guide and anchoring section; wherein said rotary insert is connected rotatably with a first one of said housing parts and said receptacle is provided on a second one of said housing parts; wherein said receptacle comprises an insertion/removal section; wherein said guide and anchoring section has a first rotary state and a second rotary state; wherein in said first rotary state said guide and anchoring section is positively guided for gliding in said insertion/removal section of said receptacle for guiding said housing parts relative to one another when being connected or separated; wherein said guiding and anchoring section in said second rotary state is secured positive-lockingly in an anchoring section of said receptacle for anchoring said housing parts relative to one another; and wherein said insertion/removal section passes into said anchoring section; wherein said guide and anchoring section of said rotary insert comprises an elongated straight stay that is rotatable upon rotation of said rotary insert about a central transverse axis that extends transversely relative to said stay and is centrally arranged relative to a longitudinal direction of said stay; wherein said insertion/removal section of said receptacle comprises a straight slot in which said stay in said first rotary position is slidable in said longitudinal direction of said stay to enable slidable connecting or uncoupling of said first and second housing parts; wherein two opposed longitudinal sides of said stay glide in positive engagement along longitudinal lateral surfaces of said slot; wherein said anchoring section of said receptacle has a rotation-symmetrical opening in which said stay, when an axis of said opening and said central transverse axis of said stay coincide, is rotatable about said central transverse axis; wherein at least parts of transverse ends of said stay positively glide along a radial inner circumferential surface of said rotation-symmetrical opening.