Squeeze-tube primer 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 a pulse connection in the outer housing connects the crankcase pulse of an engine being supplied with fuel to the inner, more flexible, liner to permit pumping action to take place when the engine is running. A pressure pulse passage between the outer and inner liner is positioned to be closed when the device is manually squeezed to achieve the priming function.
Claims5
A combination primer and pump which comprises:
- a. a pair of unsheathed, elongate concentric 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,
- c. a unidirectional valve in each of said closures, and
- d. means forming a passage associated with said outer tube to conduct a pulse pressure from an engine to a space between said tubes to cause said inner tubes to deflate and inflate sequentially to serve as a pump, said passage means and said tubes being collapsible by the application of manual pressure for the purpose of manually pulsing said tubes to utilize said tubes as a manual primer pump in the absence of said pulse pressure.
A combination primer and pump which comprises:
- a. a pair of unsheathed, elongate concentric pliant tubes dimensioned to form a chamber between the outer wall of the inner tube and the inner wall of the outer tube, said outer tube having a stiffer wall than the inner tube,
- b. means forming inlet and outlet valves for the chamber within the inner tube, and
- c. means forming a passage on the wall of the outer tube leading to the space between the tubes for the connection of a pulse source to cause said inner tube to deflate and inflate sequentially to operate as a pulse pump, said passage means and said tubes being collapsible by the application of manual pressure for the purpose of closing said passage and compressing said tubes to utilize said tubes as a manual primer pump in the absence of said pulse pressure.
A combination primer and pump which comprises:
- a. a pair of unsheathed, elongate concentric pliant tubes dimensioned to form a chamber between the outer wall of the inner tube and the inner wall of the outer tube, said outer tube having a stiffer wall than the inner tube,
- b. means forming inlet and outlet valves for the chamber within the inner tube, and
- c. means comprising a pulse tube mounted on said outer tube having a diameter materially smaller than said outer tube and having one end pneumatically connected to said chamber and the other connectible to a source of pulse pressure to cause said inner tube to deflate and inflate sequentially to operate as a pulse pump, said passage means and said tubes being collapsible by the application of manual pressure for the purpose of closing said pulse tube and compressing said tubes to utilize said concentric tubes as a manual primer pump.
A pulse pump construction comprising:
- a. an outer cylindrical tube,
- b. a closure at each end of said tube comprising a cup-like plug fitted into the respective ends of the tube each having in the cup bottom an outwardly extending nipple connection and having an annular groove in the outer wall of the cup,
- c. a perforate disc carried within the walls of each cup in a plane transverse to the axis of the cup,
- d. a unidirectional valve mounted on each said disc,
- e. an inner pliant tube within the outer tube having its ends trapped between the walls of said outer housing and the outer walls of said cups,
- f. means at the ends of said outer housing crimped inwardly to lock said inner tube and said outer tube into said respective grooves on said closures to retain the parts in assembly, and
- g. means forming an engine pulse passage into the space between said tubes to cause sequential inflation and deflation of the inner tube to effect a pumping action through said valves and inner tube.
Dependencies are inferred from the claim text.