US 4,420,736 AGranted

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

AssigneeHoneywell Inc.

InventorJames H. Krueger

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Abstract

A thermostat for controlling heating and cooling apparatuses has a temperature control point adjustment knob connected to a temperature responsive switch means for adjusting the control point thereof. A single lever changeover switch is connected to the temperature responsive switch for selectively connecting either heating or cooling apparatus to the temperature responsive switch. Temperature control point limit stops are connected to the temperature control point adjustment. Upon selecting by the single lever changeover switch either a heating or a cooling operation, the temperature control point limit stops limit the movement of the temperature control point adjustment to a first range of movement when heating is selected and a second range of movement when cooling is selected.

Claims7

Dependent claims

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 comprising
a pair of stop members mounted on said shaft,
a pivotal stop member mounted on said base member, and
said 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.

8 more elements

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 temperature control point adjustment means is a shaft mounted on said base with a knob for selectively adjusting the rotary position of said shaft,
said limit means is a first stop member attached to said shaft and a second member attached to said base and selectively cooperating with said first stop member, and
said first means connecting said changeover means to said second member to select one of said ranges upon movement of said single changeover lever means in first or second position.

6 more elements

Dependencies are inferred from the claim text.