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US 4,053,409 AGranted
Removable filter assembly with bypass valve
AssigneeCaterpillar Tractor Co.
InventorAlvin L. Kuhfuss, Jr.
Life of this patent
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AssigneeCaterpillar Tractor Co.
InventorAlvin L. Kuhfuss, Jr.
Estimating the term…
A filter assembly comprises a cover member detachably mounted on a stationary support and a support member attached to the cover member in axially spaced relationship therefrom. A tubular screen, having a filter disposed therein, is disposed axially between the cover and support member and defines an annular passage between it and the filter. In normal operation, fluid is communicated from an inlet, through the screen and filter and to an outlet. When the pressure of the fluid in the passages exceeds a predetermined level, the fluid is communicated from the inlet and through the screen and passage to open a bypass valve mounted in the cover to communicate the fluid directly to the outlet. A plurality of magnets are preferably secured on an underside of the support member and adjacent to the inlet to uniformly disperse the fluid thereby and to pick up metallic contaminants.
A removable filter assembly detachably mounted on and disposed within a stationary housing for removal as a unit therefrom, said housing having means defining an inlet at a lower end thereof and an outlet at an upper end thereof, said filter assembly comprising
In a filter assembly of the type comprising a cover detachably mounted on a stationary support, a tubular filter, first passage means for normally communicating fluid from an inlet to said filter assembly, through said filter and to an outlet thereof and bypass valve means for bypassing said filter to communicate said fluid from said inlet, through second passage means to said outlet directly, the invention wherein said cover completely covers one end of said filter and said bypass valve means is solely mounted in said cover and a bolt threadably mounted in an aperture formed through said cover for solely exposing said bypass valve means for permitting removal thereof from said cover, said bypass valve means comprising a spool reciprocally mounted in a bore defined in said cover, spring means disposed between said cover and said spool for normally urging said spool upwardly towards said bolt and to a closed position and stop means formed on an upper closed end of said spool normally engaging said bolt to position said spool at its closed position.
Dependencies are inferred from the claim text.