Dynamically optimized thermostat (dot) with tunable bimetal elem

Details Dynamically optimized thermostat (dot) with tunable bimetal elem Dynamically optimized thermostat (dot) with tunable bimetal elem

1986-02-18

1987-07-21

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337111, 337368, H01H 3752

Patent

active

046821414

ABSTRACT:
A tuning element for a temperature responsive switch includes a bimetal assembly in the form of an elongated, relatively flat bimetal strip with bending action and including integral tuning webs for adjusting the thermodynamic properties of the element. Multiple apertures are punched in a predetermined pattern in the bimetal strip to form the webs. Each of the webs is also bent in alternate directions to form ribs that reinforce the element. The bimetal strip is formed from a bimetal base portion and extension portion butt welded together; the webs being formed in the strip adjacent the weld joint. The base portion of the strip bends to open the contacts and the extension portion bends to bring the contacts back closer together, thereby controlling overshoot and providing consistent operation within a relatively narrow temperature range. A method of tuning the thermodynamic properties of a bimetal strip includes the steps of forming a plurality of spaced tuning webs in the strip and bending the webs to form reinforcing ribs. The size and number of the apertures is selected to optimize the control of the heat flow to the bimetal extension portion.

REFERENCES:
patent: 2415473 (1947-02-01), Dougherty
patent: 2647189 (1953-07-01), De Puy
patent: 2716175 (1955-08-01), Franklin
patent: 3124957 (1964-03-01), Bungo
patent: 3550055 (1970-12-01), Grover
patent: 3593253 (1971-07-01), Taylor

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