Liquid purification or separation – Processes – Separating
Reexamination Certificate
2000-05-04
2001-11-20
Savage, Matthew O. (Department: 1723)
Liquid purification or separation
Processes
Separating
C210S439000, C210S440000, C210S450000, C210S455000, C210S497100
Reexamination Certificate
active
06319415
ABSTRACT:
FIELD OF ART
Packaged fluid filters are widely used in industry and commerce, for example, as motor lubricating oil filters for stationary engines and automotive vehicles.
BACKGROUND OF INVENTION
Disposable, packaged, motor lubricating oil filter units are often of clamp-on or screw-on types which communicate a central axial fluid flow passage and an annular fluid gallery passage with appropriate pressurized fluid passages in an internal combustion engine block.
BRIEF DESCRIPTION OF THE INVENTION
Conventional packaged fluid flow filters utilize clamping structure carried by the housing canister to securely fix a filter element into contact with a fluid entry passage fitting. This is a necessary provision for preventing leakage from occurring as a result of fluid pressure acting to dislodge the filter element from its seat. Packaged filter structures often comprise a fixed standpipe disposed in the core space of spiral wound tissue filter element for the purpose of securing the filter element in place.
The packaged filter of this invention eliminates the need for clamping structure by utilizing fluid pressure within the housing canister to maintain a tissue filter element properly seated. By conducting pressurized inflowing fluid through the core passage of the filter element to a gallery extending across the face of the wound tissue filter element distal from its seat.
Hydraulic pressure is exerted on the filter element which acts to maintain the filter element core spool properly seated at its proximal end. To define the gallery and to prevent fluid leakage from the distal end of the filter element around the periphery of the filter element from occurring, a cap structure having an annular wall portion is provided facing the distal end of the filter element with the annular wall portion being partially received around te filter element tissue windings. A further overlay of tissue windings is provided around a partial length of the filter element and extends beyond the distal face of the filter element as a skirt encompassing the annular wall of the cup. When the canister is assembled, the open end face is closed by an end cover being forcibly applied and secured thereon by rolling, crimping or other manner to provide a permanent seal. The wound tissue skirt portion, by forcible application of the end cover to the canister, is squeezed between the cup and the curved wall of the canister thereby providing a seal against fluid leakage around the distal end of the filter element.
To similarly provide a seal against fluid leakage at the proximal end of the core spool, a collet may be provided comprising two axially extending annular wall portions, one disposed one for being forcible inserted between the proximal end portion of the core spool and the fluid entry passage fitting, and the other interstitially between tissue windings lying radially outward from the proximal end of the core spool.
REFERENCES:
patent: 3504803 (1970-04-01), Brayman
patent: 4017400 (1977-04-01), Schade
patent: 5143575 (1992-09-01), Glassel et al.
Savage Matthew O.
Schoff H. Keith
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