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Heating and cooling thermostat with limiting action selected by a single lever changeover switching apparatus

  • US 4,420,736 A
  • Filed: 12/24/1981
  • Issued: 12/13/1983
  • Est. Priority Date: 12/24/1981
  • Status: Expired due to Term
First Claim
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1. In a thermostat adapted for controlling heating and cooling apparatus comprising,a base member,temperature responsive switch means mounted on said base member,temperature control point adjustment means mounted on said base member and connected to adjust the control point temperature of said temperature responsive switch means,single lever changeover means mounted on said base member and connected to said temperature responsive switch means and adapted for selectively connecting either heating apparatus or cooling apparatus to said temperature responsive switch means,temperature control point limit means connected to said temperature control point adjustment means,first means connecting said single lever changeover means to said limit means to limit the range of movement of said control point adjustment means to a first range when said lever is in the heating position and to a second range when said lever is in the cooling position,said control point adjustment means has a knob attached to a shaft mounted on said base to rotate said shaft to a selected position for selecting a temperature control point of said temperature responsive switch means,said limit means comprisinga pair of stop members mounted on said shaft,a pivotal stop member mounted on said base member, andsaid first means comprising a connection between said single lever to said pivotal stop member to select said first or said second range of operation by positioning said pivotal stop member to selectively engage one of said pair of stop members.

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