Two-temperature pneumatic thermostat control system and unit the

Details Two-temperature pneumatic thermostat control system and unit the Two-temperature pneumatic thermostat control system and unit the

1978-03-20

1980-02-05

Wayner, William E.

Automatic temperature and humidity regulation

High and low temperature alternate

236 87, G05D 2300

Patent

active

041868757

ABSTRACT:
A two-temperature pneumatic thermostat control system having an output device, a two-level source of pneumatic pressure, a first temperature sensor for controlling the flow of pneumatic fluid from the source to the device when the source is at a first level thereof, a second temperature sensor for controlling the flow of pneumatic fluid from the source to the device when the source is at a second level thereof, a switching unit for automatically switching the device to be controlled by the first sensor when the source is at the first level thereof and by the second sensor when the source is at the second level thereof, and a manual reset member for causing the switching unit to switch the device to be controlled by the first sensor even though the source is at the second level thereof when the reset member is moved to a reset position thereof. The reset member includes a pivotally mounted lever having a pneumatic part for acting on one end thereof and a valve unit at the other end thereof to be controlled thereby. The valve unit comprises a close-before-open valve unit that is operatively interconnected to the other end of the lever of the reset member and the switching unit to be controlled by the reset member to cause the switching unit to switch the device to be controlled by the first sensor even though the source is at the second level thereof when the reset member is moved to the reset position thereof.

REFERENCES:
patent: 3212710 (1965-10-01), Nilles
patent: 3902663 (1975-09-01), Elmer

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