Pumps – Correlated pump and motor or clutch control – Pump distributor control
Patent
1977-08-10
1979-08-07
Freeh, William L.
Pumps
Correlated pump and motor or clutch control
Pump distributor control
417397, 417399, 417404, F04B 1700, F04B 3500
Patent
active
041636325
ABSTRACT:
A hydraulic pump assembly having a motor actuated by a source of fluid under pressure and in turn actuating a fluid pump under the control of a valve responsive to operation of the motor. The diameter of a piston of the pump is smaller than the corresponding diameter of a piston of the motor in order to permit the pump to obtain higher output pressures than are required to actuate the motor. The valve includes a valve element connected directly to the piston of the motor and slidably disposed in a pair of axially spaced, cylindrical housing parts so as to sequentially place ports provided in spaced ends of the valve element in communication with passages provided in the cylindrical housing parts.
REFERENCES:
patent: 467274 (1892-01-01), Brown
patent: 482814 (1892-09-01), Smedley
patent: 592633 (1897-10-01), Keith
patent: 1398695 (1921-11-01), Hull
patent: 1714425 (1929-05-01), Knab
patent: 2369365 (1945-02-01), Nichols
patent: 2951745 (1960-09-01), Sweet et al.
patent: 2986907 (1961-06-01), Hoop
Hinchman Leslie R.
Hinchman, Sr. Robert B.
Caldwell Bessie L.
Freeh William L.
Jacobson Harvey B.
O#Brien Clarence A.
Ross Thomas I.
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