Sump pump

Details Sump pump Sump pump

1977-11-16

1979-08-21

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

F04B 4904

Patent

active

041652045

ABSTRACT:
A sump pump having a float to initiate pumping and a flow-actuated device to continue pumping until the sump is substantially empty. The device may be in the form of a check valve held open by flow during pumping, and having a position which mechanically retains a motor switch closed.

REFERENCES:
patent: 2550093 (1951-04-01), Smith
patent: 2625107 (1953-01-01), Schaefer
patent: 2810350 (1957-10-01), MacWilliams
patent: 2844678 (1958-07-01), Nielsen
patent: 3295450 (1967-01-01), Schonwald et al.
patent: 3540027 (1970-11-01), Rauth et al.
patent: 3684400 (1972-08-01), Einerson et al.

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