Patent ID: 8741139

Claim:
In combination a detachable core and a cylindrical filter cartridge, the combination comprises: a) a filter cartridge including elastomeric end caps and a cylindrical filter element including filter pleats; b) a wire frame which includes at least two vertical struts oriented along a longitudinal direction; c) the wire frame includes an upper ring and a lower ring mounted in radial planes to the distal ends of the vertical struts; d) the wire frame includes an upper flange and a lower flange cooperatively mounted to the upper and lower rings respectively; e) wherein the lower ring includes a means for detachably mounting to the lower flange thereby allowing the filter cartridge to be inserted and detached from the core by sliding the cartridge on and off of the core along the longitudinal direction when said lower flange is detached from said lower ring; f) wherein the means for detachably mounting includes a gap in the lower ring to enable resilient compression of the ring by squeezing the lower ring in a radial inward direction prior to engagement with the lower flange; g) wherein the lower ring resiliently engages in the radial outward direction with an annular groove defined in a longitudinally extending leg of the lower flange, thereby placing the lower ring in an attached position, and retaining the elastomeric end caps of the filter cartridge on the core by abutting a radial leg of the flanges with the end caps of the filter cartridge.