Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1980-06-27
1982-11-02
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417 36, F04B 4906
Patent
active
043571310
ABSTRACT:
A suction pump has a suction pipe extending into a tank for receiving liquid. A detector, connected to a control circuit for the pump, is arranged to initiate operation of the pump when the liquid in the tank rises above a predetermined level. The detector comprises a hollow member of insulating material connected to the free end of the suction pipe. The member has a transverse dimension which is greater than that of the suction pipe whereby a shoulder is defined which connects the member to the pipe. Two or more electrodes are mounted on the member and the pump is operated when the liquid completes a circuit between the two electrodes. The electrodes are protected by the shoulder from liquid running backwardly within the suction pipe when the pump has stopped. In addition, a time delay means is included in the control circuit to delay restarting of the pump once it has stopped.
REFERENCES:
patent: 943369 (1909-12-01), Otto
patent: 3339578 (1967-09-01), Smith
patent: 3362334 (1968-01-01), Ramsay
patent: 3616824 (1971-11-01), Orlando
patent: 3657556 (1972-04-01), Foster
patent: 4083657 (1978-04-01), Misener
patent: 4171932 (1979-10-01), Miller
Freeh William L.
Look Edward
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