Fluid handling – With casing – support – protector or static constructional... – Vehicle
Patent
1979-05-29
1982-08-31
Davis, Albert W.
Fluid handling
With casing, support, protector or static constructional...
Vehicle
13762511, 91 48, 165 31, 165 42, H01H 304, F16K 1102
Patent
active
043467296
ABSTRACT:
A temperature control system including a pushbutton controlled, pneumatically operated actuator for controlling a vehicle heating and air conditioning system is disclosed. A plurality of pushbutton operated valve assemblies (112) enables an operator to control the system by selectively communicating a vacuum source connected to each valve member to a given position within a vented air-piston chamber (72). A piston (74), slidably received in the chamber, is moved along the chamber by the differential pressure across the piston face until a seal member (76) located around the piston periphery blocks the orifice of the passageway (68) communicating with the vacuum source, thus substantially sealing off the chamber from the vacuum source and preventing further piston movement. The number of output positions of the actuator piston in one embodiment of the invention is equivalent to the number of pushbutton valves which communicate the vacuum source to the air chamber. Piston movement is used to control actuation of associated heating and air conditioning system components.
REFERENCES:
patent: 3156157 (1964-11-01), Smith et al.
patent: 3408899 (1968-11-01), Golden
patent: 3502110 (1970-03-01), Ogilvie
patent: 3657966 (1972-04-01), Campbell
patent: 3983930 (1976-10-01), Franz
patent: 4083290 (1978-04-01), Andres
patent: 4126153 (1978-11-01), Raab
Davis Albert W.
Eaton Corporation
Focarino Margaret A.
Grace C. H.
Johnston R. A.
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