Pumps – Expansible chamber type – Plural pumping members in single pump chamber
Patent
1989-12-26
1991-06-18
Smith, Leonard E.
Pumps
Expansible chamber type
Plural pumping members in single pump chamber
417498, 222 54, 222333, F04B 1922
Patent
active
050245872
ABSTRACT:
The present invention pertains to a pump, in which two pistons moving in the same direction in a common cylinder bore are provided to generate the suction intake and pressure, discharge effects as well as for control. Both pistons are held by fastening members to perform a lifting movement, and one of the pistons is a control piston for performing a constant lifting movement, while the other piston is a pump piston for performing a variable lifting movement. The difference in the lifts, multiplied by the cross section of the cylinder bore, determines the delivery volume of the pump. A braking force to the oscillating piston eliminated and the velocity of discharge of the medium to be delivered is increased by providing a member 8, whose longitudinal extension between fastening members of the two pump pistons is variable during one pump cycle so as to generate the difference between the heights of lift of the two pistons that are rigidly connected to said fastening members.
REFERENCES:
patent: 1844772 (1932-02-01), La Pointe
patent: 3302578 (1967-02-01), Anderson
patent: 4405294 (1983-09-01), Albarda
patent: 4726741 (1988-02-01), Cusack
Dragerwerk Aktiengesellschaft
Kocharov M.
Smith Leonard E.
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