Variable displacement pump

Details Variable displacement pump Variable displacement pump

1986-06-13

1987-11-24

Croyle, Carlton R.

Pumps

Motor driven

Electric or magnetic motor

417521, 92136, F04B 1700, F04B 3504

Patent

active

047086033

ABSTRACT:
The present invention provides a variable displacement pump including a cylinder member, a piston member slidably received in said cylinder member, a rack rigidly mounted on one of said members and extending parallel to the longitudinal axis of said one member, a pulse motor having an output shaft, said output shaft including a pinion rigidly connected therewith and engaged by said rack, one of said cylinder and piston members being formed with an opening used in both the suction and discharge of a liquid, and check valves disposed respectively between said opening and an upstream source of liquid and between said opening and a downstream discharging system, whereby the displacement of said pump can be controlled by controlling electric input pulses to said pulse motor.

REFERENCES:
patent: 847394 (1907-03-01), Beck et al.
patent: 875488 (1907-12-01), Bagnulo
patent: 1028275 (1912-06-01), Purcell
patent: 1250474 (1917-12-01), Lee
patent: 1275440 (1918-08-01), Johnson
patent: 1293853 (1919-02-01), Meigs
patent: 2383181 (1945-08-01), Enslin et al.
patent: 3612729 (1971-10-01), Commarmot
patent: 3666142 (1972-05-01), Gust
patent: 3720487 (1973-03-01), Wiley
patent: 4509904 (1985-04-01), MacAskill et al.
patent: 4566868 (1986-01-01), Menzies

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