Screen for intake of emergency sump pump

Details Screen for intake of emergency sump pump Screen for intake of emergency sump pump

1974-09-09

1976-08-03

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417 40, 415121G, F04B 4106, F04B 4904

Patent

active

039726479

ABSTRACT:
An emergency sump pump is employed in a sump from which the liquid is normally removed by a main pump. The main pump turns on when the liquid rises to an upper level and turns off when the liquid drops to a lower level. The emergency pump has a vertical intake conduit which opens at the bottom below the lower level. This conduit is surrounded by a tube which has openings in areas below the lower level and above the upper level. The tube is solid between those two levels and also is solid above the upper area of openings.

REFERENCES:
patent: 1854517 (1932-04-01), Layne
patent: 3164095 (1965-01-01), Williams
patent: 3319571 (1967-05-01), Schaefer
patent: 3794789 (1974-02-01), Bynum
patent: 3814544 (1974-06-01), Roberts et al.

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