Clock thermostat apparatus for resetting the temperature of a space during selected time periods with means for varying the pickup time as a function of the drop in space temperature during the setback period

Claim 1

In a time controlled thermostat apparatus for providing a normal operation and no operation during a setback time period comprising, first temperature responsive switch means adapted for controlling the operation of a temperature conditioning apparatus for maintaining a predetermined normal temperature in a space, time controlled means connected to said temperature responsive switch means terminating the operation of the temperature conditioning apparatus for a predetermined time period and then restoring the operation for a temperature setback operation, and second temperature responsive means responsive to space temperature connected to said time controlled means for varying the operation of said first temperature responsive switch means for starting the operation of said conditioning apparatus at a time depending on the space temperature which drops from said normal temperature during the setback time period when the operation of said temperature conditioning apparatus was terminated, said first temperature responsive means is a switch mechanism having an operation position for a normal temperature control and a non-operation position, said time control means is a rotating member, and said second temperature responsive means is a member mounted on said rotating member having a stepped member for engaging said first temperature responsive means to move it from a non-operating position to an operating position.