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US 3,983,857 AGranted
Combination primer and pump for internal combustion engines
AssigneeWalbro Corporation
InventorAlton J. O'Connor
Life of this patent
Estimating the term…
Abstract
A combination primer and pump for internal combustion engines which utilizes a flexible cylindrical housing having a flexing liner with unidirectional valves at each end. The walls of the cylinder permit manual flexing or squeezing to pump fuel and also a pulse connection in the outer housing serves as a valve to connect the crankcase pulse of an engine being supplied with fuel to the inner liner to permit pumping action to take place when the engine is running. The pulse connection may also serve as a control for the pulse pressure and thus for the fuel flow and pressure.
Claims6
A fuel pump and manual primer which comprises:
- a. a pair of elongate concentric unsheathed pliant tubes, the outer tube having a stiffer wall than the inner tube,
- b. a closure at each end of said tubes having passages serving as inlet and outlet, respectively, to be connected to a fuel supply and an engine, and
- c. a unidirectional valve in each of said closures,
- wherein manual squeezing pressure on said outer tube causes said inner tube to deflate and inflate to effect movement of fuel through said inner tube.
1 more element
Dependencies are inferred from the claim text.