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US 4,408,178 AGranted
Thermostatic switch
AssigneeThe Singer Company
InventorsTore B. Hanssen, Chester S. Zwirek
Life of this patent
Estimating the term…
Abstract
The chamber in the metal body is filled with Freon which starts to vaporize at a temperature below the operating temperature of the switch. The vapor pressure increases substantially as the temperature rises above the refrigerant boiling point and acts against the diaphragm. The force in the diaphragm is opposed by the spring acting on the moveable seat which bears on the diaphragm pad. The pad carries a shorting bar which completes the circuit between the fixed contacts when the spring is overcome.
Claims4
A temperature responsive switch assembly comprising,
- a heat conducting body,
- a switch housing mounted on the body,
- a diaphragm between the housing and the body,
- a chamber in the body on one side of the diaphragm,
- switch means in the housing,
- a diaphragm pad on the other side of the diaphragm operative to actuate the switch means,
- a spring opposing movement of the pad to actuate the switch in response to increasing pressure in the chamber,
- a temperature responsive liquid charge in said chamber having a boiling point below the temperature at which the switch is operated whereby the charge is in the liquid/vapor state at the switch operating temperature.
5 more elements
Dependencies are inferred from the claim text.