Holder for annular filter

Claim 1

A holder attached to a horizontal support plate, said holder comprising a support basket having at its upper end a venturi tube portion with an upwardly and outwardly extending flared collar portion, a sealing ring having a tapered wall surface which cooperates with said flared collar portion to lock the open end wall portion of an open ended annular bag type filter within which said support basket is suspended between said tapered wall surface and said collar portion when a downward force is applied to the upper peripheral edge of said collar portion, said support plate containing a circular aperture of sufficient diameter to accommodate those portions of said support basket which are located below said collar portion, the horizontal rim surface of said support plate surrounding and defining said circular aperture serving as a support for an outer peripheral portion of said sealing ring, a sealing gasket positioned between said rim surface and said outer peripheral portion of said sealing ring, a threaded base ring fixed to and extending upwardly from said support plate about the aperture, a complementary threaded locking ring in threaded engagement with said base ring, said locking ring having an aperture in its center aligned with said venturi tube portion and a horizontal portion surrounding said center aperture which engages the upper peripheral edge of said flared collar portion and applies a locking force on said filter as said locking ring is rotated toward said support plate.