Dual action control mechanism

Details Dual action control mechanism Dual action control mechanism

1978-10-12

1979-12-04

O'Dea, William F.

Automatic temperature and humidity regulation

Motors

Fluid-operated

123 412, 1375962, 1376275, G05D 2302

Patent

active

041767845

ABSTRACT:
A thermostatically operated dual action control mechanism for controlling fluid actuatable devices such as the shutter and the fan clutch in the cooling system of a diesel engine in vehicles. A valve rod is provided and movable between first and second positions. In the first position, the valve rod seals off communication between a source of fluid under pressure and one of the fluid actuatable devices. In the second position of the valve rod communication is established between the fluid source and the fluid actuatable device. A hollow passageway is provided in the valve rod, and in the first position of the valve rod is open to allow fluid to flow through to the other fluid actuatable device of the devices. In the other position, the passageway is closed off by a reciprocating needle valve and simultaneously permits fluid to be exhausted from the other fluid actuatable device. A thermally responsive sensor element actuates the valve rod between the first and second positions thereof.

REFERENCES:
patent: 3048193 (1962-08-01), Cislo
patent: 3135495 (1964-06-01), Ferris
patent: 3436017 (1969-04-01), Elmer
patent: 3559688 (1971-02-01), Fischer et al.
patent: 3837361 (1974-09-01), Urban et al.
patent: 3848622 (1974-11-01), Cummings
patent: 4065052 (1977-12-01), Ridenour
patent: 4134543 (1979-01-01), Duprez

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