Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With mechanical timing means
Patent
1978-07-10
1979-12-25
Harris, George
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With mechanical timing means
337303, H01H 3762
Patent
active
041807898
ABSTRACT:
A time variable thermostat for controlling a heater comprising, a temperature activated switch connected to the heater for deactivating the heater at a selected temperature having a movable contact and at least one fixed contact, the movable contact being moved into abutment with the fixed contact when a temperature other than the selected temperature is reached to activate the heater and moved into abutment with the fixed contact to deactivate the heater when the selected temperature is reached. A temperature selection arm is connected to the movable contact and associated with a scale for selecting the temperature at which the movable contact is moved out of abutment with the fixed contact. The thermostat further includes a clock motor having a shaft rotated once in 24 hours, a temperature selection disc centrally mounted on the shaft and in frictional contact therewith having a plurality of radially extending slots therein, and an arm engagement member slidable within each of the radially extending slots and in frictional contact with the disc for abutment against the temperature selection arm. Each arm engagement member is positionable at a radial location along its associated slot which corresponds to a selected temperature. A spring is provided between the temperature selection arm and a fixed point on the thermostat for biassing the temperature selection arm against the arm engagement member. The plurality of slots are circumferentially spaced around the disc so that the temperature selection arm always abuts against at least one arm engagement member during the 24 hour period.
REFERENCES:
patent: 2832870 (1958-04-01), Kucera
patent: 3043936 (1962-07-01), Page
patent: 3258552 (1966-06-01), Hanris
Harris George
Michalos Constantine A.
Michalos Peter C.
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