Mechanical control for fogging systems

A control mechanism for use with a portable fogging system, which portable fogging system comprises an insecticide storage tank mounted to a transportable cart and a multiplicity of nozzles, said control mechanism comprising:

• a. A mechanical clock-operated timer having a range of from a minimum of zero to fifteen minutes to a maximum of from zero to thirty minutes;
• b. A rotary cam device mechanically joined to the mechanical timer comprising a circular disc including a circumferential surface and a single circumferential indentation;
• c. A cam follower interacting with the rotary cam device comprising a pin engaging first the circumferential surface and second the circumferential indentation of the circular disc respectively and a bearing surface remote from the pin but attached to the pin;
• d. A first rotating lever and a second rotating lever rigidly joined by a rotating shaft so that the first rotating lever and the second rotating lever rotate in the same direction, said rotating shaft rotating within a bearing housing on a dust proof bearing surface, the said first rotating lever engaging the bearing surface of the cam follower and being rotated by the bearing surface of the cam follower;
• e. A normally closed pilot valve comprising an inlet port, an outlet port and an actuating means, said actuating means interacting with the second rotating lever only to open the normally closed pilot valve;
• f. A two-stage pneumatic valve, which pneumatic valve controls the flow of compressed air or the like from an external source to the nozzles of the portable fogging system and which pneumatic valve is pneumatically connected with the pilot valve and actuated solely by the pilot valve;
• g. A feed line from the external source to the two-stage pneumatic valve, which feed line includes a tee junction between the external source and the pneumatic valve and a second feed line from the tee junction to the pilot valve, thereby directing compressed air or the like to the pilot valve before said compressed air or the like reaches the two-stage pneumatic valve.