Thermostat comprising means preventing switch contact binding

Details Thermostat comprising means preventing switch contact binding Thermostat comprising means preventing switch contact binding

H - Electricity

01

H

306/158

H01H 73/24 (2006.01)

Patent

CA 1055994

ABSTRACT OF THE DISCLOSURE A thermostat including a housing assembly, a snap-acting ther- mally responsive actuator, and a control switch is disclosed having a switch operating arrangement coacting with the switch and the actuator. The switch operating arrangement includes a lever structure hinged to the thermostat housing assembly for transmitting motion between the switch and the actuator by pivoting about the hinge. Heat transfer to the hinge is minimized so that movement of the lever is not impeded by the effects of heat on the hinge. The lever structure slidably engages the switch during movement about the hinge resulting in gradual wearing away of the switch engaging lever por- tion which compensates for normally occurring switch contact erosion. In one embodiment of the invention the switch operating arrange- ment includes a manually operated trip-free resetting mechanism which is con- structed and arranged to apply a limited resetting force to the switch for preventing premature reclosing of the switch contacts and avoiding the pos- sibility of damage to the switch.

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