Motorized crankcase oil drainage system

Claim 2

A powered drainage system for draining oil from the crankcase of an internal combustion engine through the crankcase drain opening, said drainage system comprising a motor-driven pump having an input and an output thereto, a drain plug receivable in the drain opening and having a drain passage therethrough, said drain passage having a first portion of relatiVely large crosssectional area and a second portion of relatively small crosssectional area and a sloping portion interconnecting said first and second portions to form a valve seat, said drain passage having an inlet port at said second portion communicating with the interior of the crankcase and an outlet port communicating with the exterior of the crankcase, said drain plug including an internally threaded outlet coupling portion disposed in surrounding relationship with said outlet port, a hydraulic conduit providing communication between the outlet port of said drain passage and the input of said pump, said conduit including an externally threaded coupling member receivable in and threadedly engageable with said internally threaded outlet coupling portion for providing a fluid-tight coupling between said conduit and said drain plug, valve mechanism carried by said drain plug and movable between a closed condition in engagement with said valve seat for closing said second portion of said drain passage to prevent the flow of oil through said drain passage and an open condition out of engagement with said valve seat for accommodating the flow of oil through said drain passage, and means yieldably biasing said valve mechanism into the closed condition thereof to prevent accidental escape of oil through said drain passage, operation of said pump effecting movement of said valve mechanism to the open condition thereof and consequent pumping of oil from the crankcase through said drain passage and said conduit to the output of said pump.

Claim 3

A powered drainage system for draining oil from the crankcase of internal combustion engine through the crankcase drain opening, said drainage system comprising a motor-driven pump having an input and an output thereto, a drain plug receivable in the drain opening and having a drain passage therethrough, said drain passage having a first portion of relatively large cross-sectional area and a second portion of relatively small cross-sectional area and a sloping portion interconnecting said first and second portions to form a valve seat, said drain passage having an inlet port at said second portion communicating with the interior of the crankcase and an outlet port communicating with the exterior of the crankcase, said drain plug including an annular shoulder disposed adjacent to said outlet port in surrounding relationship therewith, and an internally threaded outlet coupling portion disposed in surrounding relationship with said shoulder, a hydraulic conduit providing communication between the outlet port of said drain passage and the input of said pump, said conduit having an annular flange at one end thereof for engagement with the annular shoulder on said drain plug, an externally threaded coupling member receivable in and threadedly engageable with said internally threaded outlet coupling portion for providing a fluid-tight coupling between said conduit and said drain plug, valve mechanism carried by said drain plug and movable between a closed condition in engagement with said valve seat for closing said second portion of said drain passage to prevent the flow of oil through said drain passage and an open condition out of engagement with said valve seat for accommodating the flow of oil through said drain passage, and means yieldably biasing said valve mechanism into the closed condition thereof to prevent accidental escape of oil through said drain passage, operation of said pump effecting movement of said valve mechanism to the open condition thereof and consequent pumping of oil from the crankcase through said drain passage and said conduit to the output of said pump.

Claim 4

A powered drainage system for draining oil from the crankcase of internal combustion engine through the crankcase drain opening, said drainage system comprising a motor-driven pump having an input and an output thereto, a drain plug receivable in the drain opening and having a drain passage therethrough, said drain passage having a first portion of relatively large cross-sectional area and a second portion of relatively small cross-sectional area and a sloping portion interconnecting said first and second portions to form a valve seat, said drain passage having an inlet port at said second portion communicating with the interior of the crankcase and an outlet port communicating with the exterior of the crankcase, said drain plug including an annular shoulder disposed adjacent to said outlet port in surrounding relationship therewith, and an internally threaded outlet coupling portion disposed in surrounding relationship with said shoulder, a hydraulic conduit providing communication between the outlet port of said drain passage and the input of said pump, said conduit having an annular flange at one end thereof for engagement with the annular shoulder on said drain plug, an externally threaded coupling member receivable in and threadedly engageable with said internally threaded outlet coupling portion for providing a fluid-tight coupling between said conduit and said drain plug, valve mechanism carried by said drain plug and movable between a closed condition in engagement with said valve seat for closing said second portion of said drain passage to prevent the flow of oil through said drain passage and an open condition out of engagement with said valve seat for accommodating the flow of oil through said drain passage, and means yieldably biasing said valve mechanism into the closed condition thereof to prevent accidental escape of oil through said drain passage, operation of said pump effecting movement of said valve mechanism to the open condition thereof and consequent pumping of oil from the crankcase through said drain passage and said conduit to the output of said pump.

Claim 5

The powered drainage system set forth in claim 2, wherein said annular shoulder is provided with a generally conical outer surface, said annular flange on said conduit having a generally conical inner surface adapted to be disposed in engagement with conical outer surface on said shoulder in surrounding relationship therewith when said coupling membeR is tightly threadedly engaged with said drain plug for insuring a fluid-tight coupling between said conduit and said drain plug.