Pumps – Motor driven – Fluid motor
Patent
1974-12-27
1976-05-18
Freeh, William L.
Pumps
Motor driven
Fluid motor
415170A, 415197, F04B 908, F01D 102
Patent
active
039574032
ABSTRACT:
A dewatering pump assembly for pumping water from excavations or other holes in the ground and upwardly to a more or less remote discharge area. The pump assembly includes a housing in which the impeller, fluid motor, and the connecting drive shaft all are located and the drive shaft and its bearings sealed in a bath of pressurized oil to prevent water from leaking into the housing.
REFERENCES:
patent: 640345 (1900-01-01), Wilberforce
patent: 2346372 (1944-04-01), Foottit et al.
patent: 2668068 (1954-02-01), Bredemeier
patent: 3136258 (1964-06-01), Bood
patent: 3275330 (1966-09-01), Rein et al.
patent: 3398694 (1968-08-01), Lerch
patent: 3574487 (1971-04-01), Mohn
Freeh William L.
LaPonte G. P.
Nilles James E.
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