Fluid handling – Systems – Programmer or timer
Patent
1975-04-28
1977-01-25
Cohan, Alan
Fluid handling
Systems
Programmer or timer
251 30, 251137, 13762564, 239 69, A01G 2516
Patent
active
040046125
ABSTRACT:
A remote control for a large-area sprinkler system, where the sprinklers are to be operated in a sequential manner according to a specified program. The sprinklers are hydraulically operated and are controlled by a four-way latch valve whose piston, or core, will shift to either a sprinkler-open state or a sprinkler-closed state, the shifting being by energizing opposing solenoids.
The electrical system to power the solenoids is a low voltage - low amperage control circuit permitting the use of small diameter wires to be extended from a central power supply source for substantial distances therefrom and to each sprinkler. A capacitor in the circuit adjacent to latch valves builds up a charge sufficient for one of the solenoids to be energized to shift the latch valve to either open or close the sprinkler. Each solenoid is connected in the circuit by a connective lead which includes an electronic gate such as an NPN transistor which will normally prevent a flow of current through the lead but which may receive a signal voltage, as at the base of the transistor to permit current to flow, as from the capacitor to the solenoid.
The signal voltage need not be large, and the current thereby generated very small; hence, very small diameter wire leads can be used to signal the gate even though they may be extended for long distances from a control station. Preferably, however, an AC coded signal can be superimposed upon the control circuit which can be picked up by a discriminator at a selected sprinkler to signal the proper gate at the sprinkler for off or on operation. This coded signal will thus permit any one of a large number of sprinklers to be selectively operated, and a computer can be used and programmed to control any selected operative sequence for the sprinklers.
REFERENCES:
patent: 3412971 (1968-11-01), McDivitt
patent: 3898997 (1975-08-01), Kelley
patent: 3911955 (1975-10-01), Link
Hummel, Jr. Frank
King Edmond B.
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