Fluid sprinkling – spraying – and diffusing – Processes
Patent
1974-08-22
1976-09-21
Schwadron, Martin P.
Fluid sprinkling, spraying, and diffusing
Processes
239 63, 47 38, 137 78, A01G 2500
Patent
active
039814467
ABSTRACT:
A water operated control apparatus and method for operating a controlled device is associated with moisture sensing apparatus for sensing the level of moisture available at a location and operating the controlled device in response thereto. Moisture sensing means is disposed at the location and is adapted to selectively pass air therethrough when the level of moisture at the location falls to a predetermined level, or prevent the passage of air therethrough when the level of moisture rises to a predetermined level. A housing is operatively connected to the sensing means and to a supply of water. A diaphragm is disposed in the housing in a manner forming a chamber therein, the interior of the chamber being in fluid communication with air passing through the sensing means. In one embodiment of the apparatus, a drain line of relatively small internal diameter is also in communication with the chamber and drains water from said supply in a hanging column of water such that the weight of the column of water pulls a partial vacuum in the chamber under the diaphragm when air is not being passed therein by the sensing means, as when the moisture level is above the predetermined level. Air from the sensing means relieves the negative pressure generated by the hanging column of water when the moisture level falls below the predetermined level. In another embodiment of the apparatus, the weight of water in a drain line is used to produce a positive pressure over the diaphragm when air is not passed by the sensing means. Air passing out through the sensor when the moisture level falls below a predetermined level relieves the pressure on the diaphragm. Movement of the diaphragm in response to the changing air pressure in the chamber may be used to operate a valve controlling flow of water through the chamber, or electrical contacts or a mechanical connection associated with the diaphragm which may in turn be connected to a controlled device or devices.
The water operated control method includes the steps of connecting a moisture responsive air valve in air flow communication with a chamber, establishing a vertical column of water in a conduit in fluid flow communication with the chamber, placing the chamber in air pressure sensing relation with an air actuated device and operating the device in response to variations in air pressure acting upon the device when air is not passed by the air valve compared to when air is passed by the air valve.
REFERENCES:
patent: 2743552 (1956-05-01), Hunter
patent: 3747399 (1973-07-01), Treirat
patent: 3758987 (1973-09-01), Crane
patent: 3856205 (1974-12-01), Rohling
Gerard Richard
Schwadron Martin P.
The Toro Company
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