Coalescer or filter end cap

Details

Inventors: DeGraffenreid, Howard T.;
Assignee:
Primary Examiner: Sever; Frank
Assistant Examiner:
Attorney, Agent or Firm: Jeffers; Albert L., Hoffman; John F.

A coalescer or filter cartridge end cap having a disc-like base portion adapted to support filter media or coalescing media, and a central opening therein through which the liquid to be passed through the filter or coalescer flows. A counterbore section coaxial with the center line of the end cap forms a downwardly depending skirt having a lower edge adapted to receive a gasket. The skirt extends sufficiently to permit the cartridge equipped with the end caps of the present invention to be fitted over a wide variety of cartridge mounting stools, which normally include a short annular upstanding extension perpendicular to the cartridge sealing surface. Additionally, the inner diameter of the skirt is dimensioned to allow for sufficient clearance between the inner diameter of the skirt and the outer diameter of the stool extension, and is sufficiently long to afford clearance space between the upper end of the stool extension and the bottom surface of the base portion. Preferably, the inner diameter of the opening of the end cap is less than the outer diameter of the mounting stool extension.

DETAILED DESCRIPTION The present invention permits the amount of coalescing and filtering media to be increased by enabling the inside diameter of the primary bore of the end cap to be reduced yet permitting mounting of the end cap on a standard cartridge mounting stool having a centering extension with an outer diameter larger than the inner diameter of the end cap primary bore.
This is accomplished by providing a downwardly extending annular skirt, which may have a cylindrical outer configuration and either a cylindrical or tapering inner configuration, which fits around the upstanding centering extension of the mounting stool.
Since the primary bore for the end cap is raised above the end of the mounting stool centering extension, the inner diameter of the primary bore may be varied to accommodate the amount of filtering or coalescing media desired without regard to the outer diameter of the mounting stool extension.
Since filter cartridge end caps may be inexpensively produced and since it is a simple manufacturing matter to vary the diameters of their primary bores, filters and coalescers having a wide variety of capacities may be produced without major modifications to the cartridge design.
Additionally, these cartridges may be installed on standard size cartridge mounting stools without the necessity for any modification whatsoever.
A further advantage to the end cap according to the present invention is that sealing between the end cap and mounting stool may more easily be effected by reducing the sealing surface area, thereby requiring a lower coaxial load to effect the seal.
A similarly shaped end cap may be utilized on the opposite end of the cartridge for sealing against the head.
Specifically, the present invention relates to a coalescer or filter end cap comprising a disc-like base portion having an upper surface adapted for supporting filter or coalescing media and having an opening extending therethrough spaced radially inwardly of the peripheral edge of the base portion

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