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Front surface grid for thermostat subbase

  • US 4,998,085 A
  • Filed: 12/21/1989
  • Issued: 03/05/1991
  • Est. Priority Date: 12/21/1989
  • Status: Expired due to Term
First Claim
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1. A thermostat subbase for mounting a thermostat thereon with the thermostat and the subbase adapted to control heating and cooling apparatus, comprising:

  • a base of insulating material, the base having a front surface having upstanding projections, a back surface, and holes extending through the base for receiving a cutting tool;

    a grid of conductive material comprising;

    electrical terminals integrally formed from said grid for connection to the thermostat to improve conductivity;

    openings in said grid located to receive the upstanding projections when the grid is placed on the front surface, with the projections then being staked to secure the grid to the front surface;

    tie bars between grid portions for electrically connecting said portions, said tie bars extending over said holes so that a cutting tool when moving in a direction from the back surface toward the front surface will cut out portions of said tie bar;

    switch means including a conductive ball for connecting a first portion of said grid to an adjoining second portion of said grid, said ball being biased toward the front surface and attached to a lever pivotally mounted to said base for positioning the ball to contact said first and second grid portions, said grid portions contacted by said ball having flat switching segments with edges curled toward the base to increase the contact area of the ball with said grid portions to improve conductivity.

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