Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1982-03-01
1984-04-10
Look, Edward K.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
200 84C, F04B 4904
Patent
active
044418604
ABSTRACT:
An apparatus comprising a float vertically movable in a case, a driven member fitting to the float and having a movable attracting portion, upper and lower fixed attracting members disposed above and below the portion in opposed relation thereto, a stopper provided at a lower portion of the driven member for supporting the load of the float, a reed switch magnetically operable by the approach or retreat of the movable portion, and a contactless switching element consisting essentially of a TRIAC and operable by the reed switch. The reed switch is instantaneously opened or closed and held opened or closed when water level reaches an upper limit or lower limit. The apparatus is useful for automatically controlling underwater pumps.
REFERENCES:
patent: 3316845 (1967-05-01), Schumann
patent: 3684400 (1972-08-01), Einerson et al.
patent: 4345879 (1982-08-01), Steiner
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