Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1983-12-06
1985-06-25
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
417 63, 340 60, 34030915, 340626, 307118, F04B 4906, F04B 2100, G08B 2100
Patent
active
045251258
ABSTRACT:
A pump control system has a vacuum pump driven by a DC motor to supply a negative pressure to a container first power and driving transistors which are interconnected to energize the DC motor, second power and driving transistors which are interconnected to turn an alarm lamp on, and a pressure sensor having a set of normally closed contacts which are connected to the first driving transistor and which are connected via a Zener diode to the second driving transistor; the contacts opened by at least a predetermined negative pressure within the container so as to immediately turn the first power transistor off and so as the second power transistor off with a time delay as determined by a parallel combination of a capacitor and a resistor connected to the Zener diode.
REFERENCES:
patent: 2690291 (1954-09-01), Taylor
patent: 3050003 (1962-08-01), Edwards
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patent: 3473549 (1969-10-01), Moyer
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patent: 4171932 (1979-10-01), Miller
patent: 4277226 (1981-07-01), Archibald
patent: 4309149 (1982-01-01), McCombs, Jr.
patent: 4359716 (1982-11-01), Miyamaru et al.
Matsumoto Akio
Yokota Mitsuyoshi
Freeh William L.
Mitsubishi Denki & Kabushiki Kaisha
Neils Paul F.
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