Dual action control mechanism

Details Dual action control mechanism Dual action control mechanism

1976-11-04

1977-12-27

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Fluid-operated

123 4106, 123 4112, 192 82T, 236 353, 236 84, G05D 2302

Patent

active

040650529

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. A hollow passageway is provided in the valve rod, and in one position of the valve rod is open to allow fluid to flow through to one of two exhaust ports in the valve housing to actuate one of the devices. In the other position, the passageway is closed off by a reciprocating needle valve. A thermally responsive sensor element actuates the valve rod between the first and second positions thereof. A limit switch is provided and actuated by the needle valve in the second position of the valve rod and opens up a solenoid valve to allow fluid to flow to the other device.

REFERENCES:
patent: 1410361 (1922-03-01), Blackmore
patent: 2661148 (1953-12-01), Englander
patent: 2996079 (1961-08-01), Mahand et al.
patent: 3226025 (1965-12-01), Ferris
patent: 3759056 (1973-09-01), Graber
patent: 3955760 (1976-05-01), Ridenour et al.

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