Oil anti-drainback device with bypass

Claim 2

In an internal combustion engine lubricating oil circulating system having an oil pressure source that is operable when the engine is running to supply lubricating oil under pressure to various areas of the engine requiring lubrication, the combInation comprising: means providing fluid communication between the oil pressure source and an area of the engine requiring lubrication, including first conduit means; check valve means at one end of said first conduit means, said check valve means being effective to open when the engine is running and to close upon stopping of the engine for preventing oil from flowing through said first conduit means from said area of the engine requiring lubrication toward the oil pressure source; second conduit means, said second conduit means being conditional to provide fluid communication between said area of the engine requiring lubrication and a point exteriorly of the engine; and means cooperable with said second conduit means for selectively conditioning said second conduit means for preventing and permitting draining of oil from said area of the engine requiring lubrication to said point exteriorly of the engine through said second conduit means.

Claim 3

In an internal combustion engine lubricating oil circulating system as set forth in claim 1, wherein said first and second conduit means are formed in a housing portion of the engine, one end of second conduit means opening into surface of said housing portion, and said means cooperable with said second conduit means for selectively conditioning said second conduit means for preventing and permitting draining of oil from said area of the engine requiring lubrication to said point exteriorly of the engine includes manually operable valve means adjacent said surface for closing and opening the opening of said second conduit means into said surface.

Claim 4

In an internal combustion engine lubricating oil circulating system as set forth in claim 2, wherein said means providing fluid communication between the oil pressure source and an area requiring lubrication further includes a filter assembly said valve means being associated with said filter assembly; and means for detachably securing said filter assembly to said housing portion of the engine adjacent said surface thereof, said valve means being effective to close said opening of said second conduit into said surface when said filter element is secured to said housing portion of the engine.

Claim 5

In an internal combination engine lubricating oil circulating system as set forth in claim 3, wherein said valve means comprises sealing land means carried by a generally flat, imperforate surface of said filter assembly, said sealing land means encircling said opening of said second conduit into said surface and abutting said housing portion surface when said filter assembly is secured to said housing portion of the engine.

Claim 6

In an internal combustion engine lubricating oil circulating system as set forth in claim 4, wherein said filter assembly includes a disposable filter element and a filter housing for said filter element, said filter assembly being provided with oil inlet means and oil outlet means, said oil inlet means being in fluid communication with the oil pressure source and said oil outlet means being in fluid communication with one end of said first conduit means when said filter assembly is attached to said housing portion of the engine.

Claim 7

In an internal combustion engine lubricating oil circulating system as set forth in claim 1, wherein said means providing fluid communication between the oil pressure source and an area of the engine requiring lubrication further includes a filter assembly, said filter assembly being interposed between one end of said first conduit means and the oil pressure source.

Claim 8

In an internal combustion engine lubricating oil circulating system as set forth in claim 6, including means for detachably securing said filter assembly to the engine; and said means cooperable with said second conduit means for selectively conditioning said second conduit means for preventing and permitting draining of oil from said area of the engine requiring lubrication to said point exteriorly of the engine includes valve means associatEd with said filter assembly, said valve means conditioning said second conduit means for preventing draining of oil from said area of the engine requiring lubrication to said point exteriorly of the engine when said filter assembly is secured to the engine.

Claim 9

In an internal combustion engine lubricating oil circulating system as set forth in claim 7, wherein said valve means comprises sealing land means, said sealing land means being interposed between said filter assembly and one end of said second conduit means for closing said second conduit means when said filter assembly is secured to the engine.

Claim 10

In an internal combustion engine lubricating oil circulating system having an oil pressure source that is operable when the engine is running to supply lubricating oil under pressure to various areas of the engine requiring lubrication, the combination comprising: oil supply conduit means providing fluid communication between the oil pressure source and an area of the engine requiring lubrication including an intermediate separable conduit portion; oil drain conduit means conditional to provide fluid communication between said area of the engine requiring lubrication and a point exteriorly of the engine; and oil flow control means cooperable with said oil drain conduit means for selectively conditioning said oil drain conduit means for preventing and permitting draining of oil from said area of the engine requiring lubrication to said point exteriorly of the engine through said oil drain conduit means, said oil flow control means being associated with said separable conduit portion and being effective to disestablish fluid communication between said area of the engine requiring lubrication and said point exteriorly of the engine when said separable conduit portion is a part of said oil supply conduit means and is not separated therefrom.

Claim 11

In an internal combustion engine lubricating oil circulating system having an oil pressure source that is operable when the engine is running to supply lubricating oil under pressure to various areas of the engine requiring lubrication, the combination comprising: oil supply conduit means providing fluid communication between the oil pressure source and an area of the engine requiring lubrication including an intermediate separable conduit portion; oil drain conduit means conditional to provide fluid communication between said area of the engine requiring lubrication and a point exteriorly of the engine; and oil flow control means cooperable with said oil drain conduit means for selectively conditioning said oil drain conduit means for preventing and permitting draining of oil from said area of the engine requiring lubrication to said point exteriorly of the engine through said oil drain conduit means, said oil flow control means being associated with said separable conduit portion and being effective to disestablish fluid communication between said area of the engine requiring lubrication and said point exteriorly of the engine when said separable conduit portion is a part of said oil supply conduit means and is not separated therefrom.

Claim 12

In an internal combustion engine lubricating oil circulating systems as set forth in claim 9, wherein: said oil drain conduit means is formed in a portion of said engine and has an outlet opening into a wall surface thereof: said separable conduit portion includes a filter assembly detachably securable to the engine; and said oil flow control includes an imperforate wall surface of said filter assembly, said imperforate wall surface being positioned over and closing said outlet opening of said oil drain means when said filter assembly is secured to the engine.