Dynamically optimized thermostat (dot) with tunable bimetal element

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.

Dependencies are inferred from the claim text.