US3912045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating pump
Assignee: RA Lister and Co Ltd
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Filing: 1973-06-22
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Granted: 1975-10-14
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Expires: 1993-06-22
Abstract
Abstract A pump intended particularly for pumping lubricant through engines. The pump is easily assembled and caters for changes in the demand for the lubricant automatically without the need for pressure relief valves. The pump has a reciprocable piston moved by an operating member, a pumping stroke of the operating member giving a fixed delivery and that of the piston giving a delivery dependent on the demand for lubricant.
Inventors
- 👤 Alberto Jorge Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:08
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/126; F04B49/00; F04B49/12; F04B49/121; F04B9/00; F04B9/02; F16; F16N; F16N13/00; F16N13/02; F16N13/06; F16N13/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
263 words
An internal combustion engine and lubricant pump combination, comprising a crankcase, a lubricant reservoir defined by the crankcase, a removable sump cover provided for said crankcase, a rotatable camshaft drivable by said internal combustion engine, a bore defined by said crankcase, a sleeve located within said bore, non-resilient abutment means on said sump cover engaging one end of said sleeve to retain the sleeve in said bore, a lubricant inlet defined at said one end of said sleeve below the level of lubricant to be contained in said reservoir, a lubricant outlet defined towards the end of said bore opposite to said inlet through which lubricant will pass to lubricate the internal combustion engine, a piston located in said sleeve between said inlet and said outlet, said piston being reciprocally movable in said sleeve, a one-way valve arranged between the inlet and outlet to enable lubricant to flow past said piston from said inlet to said outlet, cam means on said camshaft, an operating rod drivable by said cam means longitudinally of said bore, said operating rod extending into the bore and being operable to move said piston in said sleeve, said operating rod being operable to discharge liquid through said outlet at a rate not exceeding the minimum lubricant demand of said internal combustion engine when moving in onE direction in said sleeve, and the piston being operable to discharge liquid through said outlet when moving in the opposite direction in said sleeve, the amount of lubricant discharged by said piston being dependent on the lubricant demand of the internal combustion engine.
Claim 2
Dependent Claim
263 words
An internal combustion engine and lubricant pump combination, comprising a crankcase, a lubricant reservoir defined by the crankcase, a removable sump cover provided for said crankcase, a rotatable camshaft drivable by said internal combustion engine, a bore defined by said crankcase, a sleeve located within said bore, non-resilient abutment means on said sump cover engaging one end of said sleeve to retain the sleeve in said bore, a lubricant inlet defined at said one end of said sleeve below the level of lubricant to be contained in said reservoir, a lubricant outlet defined towards the end of said bore opposite to said inlet through which lubricant will pass to lubricate the internal combustion engine, a piston located in said sleeve between said inlet and said outlet, said piston being reciprocally movable in said sleeve, a one-way valve arranged between the inlet and outlet to enable lubricant to flow past said piston from said inlet to said outlet, cam means on said camshaft, an operating rod drivable by said cam means longitudinally of said bore, said operating rod extending into the bore and being operable to move said piston in said sleeve, said operating rod being operable to discharge liquid through said outlet at a rate not exceeding the minimum lubricant demand of said internal combustion engine when moving in onE direction in said sleeve, and the piston being operable to discharge liquid through said outlet when moving in the opposite direction in said sleeve, the amount of lubricant discharged by said piston being dependent on the lubricant demand of the internal combustion engine.
Claim 3
Dependent Claim
28 words
A combination according to claim 1 wherein the piston is moved in said opposite direction towards said outlet by spring means arranged between the piston and said sleeve.
Claim 4
Dependent Claim
49 words
A combination according to claim 2 wherein the piston comprises a head element and a body element, the head element being engaged by said operating rod and the body element being engaged by said spring means, said spring means urging the body element into engagement with the head element.
Claim 5
Dependent Claim
26 words
A combination according to claim 3 wherein the head member and the body member are each formed with ducts for the lubricant flowing past the piston.
Claim 6
Dependent Claim
88 words
A combination according to claim 1 wherein an axial duct is defined by said piston, said one-way valve being arranged in said axial duct and being arranged to close the axial duct when the piston moves in said opposite direction, an inlet chamber is defined between said liquid inlet and the adjacent end of said piston, and said piston defines a transverse bore upstream of said one-way valve, said transverse bore constituting an air-vent interconnecting the axial duct and said inlet chamber to facilitate priming of the pump.
Claim 7
Dependent Claim
106 words
A combination according to claim 1 wherein said lubricant inlet is provided with a one-way inlet valve arranged to close said inlet when the operating rod moves the piston in said one direction and arranged to open the inlet when the piston moves in said opposite direction, said inlet valve comprising a seat defined by said sleeve, a valve member engageable with the seat to close said inlet, and stop means for limiting movement of said valve member when the piston moves in said opposite direction, said stop means permitting flow of lubricant past the valve member during movement of the piston in said opposite direction.
Claim 8
Dependent Claim
49 words
A combination according to claim 6 wherein the stop means comprises an annular plate defining a seat for said valve member and formed with a plurality of radial by-pass slots to enable lubricant to by-pass the valve member when the valve member engages the seat defined by the plate.
Claim 9
Dependent Claim
27 words
A combination according to claim 1 wherein the ratio of the cross-sectional areas of the piston and said operating rod is in the range 9:1 and 4:1.
Claim 10
Dependent Claim
234 words
A pump, for delivering lubricant to lubricate an internal combustion engine, comprising a casing, a bore defined by said casing, a piston reciprocally movable in said bore, operating means extending into the bore for moving the piston in one direction along said bore, means for moving the piston in an opposite direction along the bore, a liquid inlet defined at one end of said bore, an inlet chamber defined between said liquid inlet and the adjacent end of said piston, a liquid outlet defined towards the opposite end of said bore, an axial duct defined by said piston through which lubricant will flow between said inlet chamber and said outlet, a one-way valve provided in said axial duct arranged to close the axial duct when the piston moves in said opposite direction, said piston defining a transverse bore upstream of said one-way valve, said transverse bore constituting an air-vent interconnecting the axial duct and said inlet chamber upstream of said one-way valve to facilitate priming of the pump, said operating means being arranged to discharge lubricant through said outlet at a rate not exceeding the minimum lubricant demand at said outlet, and the piston being arranged to discharge lubricant through said outlet when moving in said opposite direction along the bore, the amount of lubricant discharged by movement of the piston in said opposite direction being dependent on the lubricant demand at said outlet.
Claim 11
Dependent Claim
234 words
A pump, for delivering lubricant to lubricate an internal combustion engine, comprising a casing, a bore defined by said casing, a piston reciprocally movable in said bore, operating means extending into the bore for moving the piston in one direction along said bore, means for moving the piston in an opposite direction along the bore, a liquid inlet defined at one end of said bore, an inlet chamber defined between said liquid inlet and the adjacent end of said piston, a liquid outlet defined towards the opposite end of said bore, an axial duct defined by said piston through which lubricant will flow between said inlet chamber and said outlet, a one-way valve provided in said axial duct arranged to close the axial duct when the piston moves in said opposite direction, said piston defining a transverse bore upstream of said one-way valve, said transverse bore constituting an air-vent interconnecting the axial duct and said inlet chamber upstream of said one-way valve to facilitate priming of the pump, said operating means being arranged to discharge lubricant through said outlet at a rate not exceeding the minimum lubricant demand at said outlet, and the piston being arranged to discharge lubricant through said outlet when moving in said opposite direction along the bore, the amount of lubricant discharged by movement of the piston in said opposite direction being dependent on the lubricant demand at said outlet.
References Cited (Backward Citations)
US1308916A
Cited
US2675096A
Cited
US1396296A
Cited
US1574181A
Cited
US1669306A
Cited
US3479958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |