Clock controlled thermostat

Claim 2

In a dual temperature thermostat, the combination comprising: a pair of temperature-activated switches manually settable to respond to different ambient temperature levels; a control circuit; a pair of time switches associated with respective ones of said temperature-activated switches; timing means for activating said time switches to switch a timeselected one of said temperature-activated switches into said control circuit; and means for energizing said timing means directly from said control circuit regardless of the condition of said switches.

Claim 3

The thermostat of claim 1 in which said enErgizing means includes a plurality of current paths controlled by said switches.

Claim 4

The thermostat of claim 2 wherein one of said current paths shunts said timing means when the selected temperature-activated switch is closed and another of said current paths shunts the selected temperature-activated switch when it is open.

Claim 5

The thermostat of claim 3 wherein said one path has a low resistance and said other path has a high resistance.

Claim 6

A thermostat for dual temperature control of an air conditioning unit, comprising: a back plate adapted for attachment to a building structure, including a first electrical connector member having a pair of terminals; and a housing adapted for removable attachment to said back plate, said housing including a. a pair of temperature-activated switches which respond to different levels of ambient temperature, b. a second electrical connector member that is engageable with said first connector member, having first and second terminals, c. a pair of time switches, each being coupled in a series circuit with said first terminal and a corresponding one of said temperature-activated switches, d. timing means coupled between said second terminal and each of said series circuits whereby the selected one of said temperature-activated switches is coupled between said first and second terminals whenever its associated time switch is closed, said timing means being operable for closing said time switches alternately, and e. a pair of load circuits, one coupled in parallel with the selected temperature-activated switch when it is open and the other coupled in parallel with said timing means when the selected temperature-activated switch is closed.

Claim 7

A thermostat for dual temperature control of an air conditioning unit, comprising: a back plate adapted for attachment to a building structure, including a first electrical connector member having a pair of terminals; and a housing adapted for removable attachment to said back plate, said housing including a. a pair of temperature-activated switches which respond to different levels of ambient temperature, b. a second electrical connector member that is engageable with said first connector member, having first and second terminals, c. a pair of time switches, each being coupled in a series circuit with said first terminal and a corresponding one of said temperature-activated switches, d. timing means coupled between said second terminal and each of said series circuits whereby the selected one of said temperature-activated switches is coupled between said first and second terminals whenever its associated time switch is closed, said timing means being operable for closing said time switches alternately, and e. a pair of load circuits, one coupled in parallel with the selected temperature-activated switch when it is open and the other coupled in parallel with said timing means when the selected temperature-activated switch is closed.

Claim 8

A temperature control device for providing automatic multiple-temperature control of an air conditioning unit, comprising: a single pair of terminals adapted to be coupled in a series loop circuit with an electromechanical control device and a control voltage cource; multiple temperature-activated switches each of which is operable in response to a corresponding predetermined ambient air temperature; multiple time switch means operable for coupling a selected one of said temperature-activated switches across said terminals; timing means coupled to said time switch means for selectively operating the same; first resistor means coupled in a series loop with said timing means and said terminals when the selected temperature-activated switch is open; and second resistor means coupled in parallel with said timing means between said terminals when the selected temperature-activated switch is closed; said switches, switch means, and resistors cooperatively maintaining substantially constant current from the control voltage source through said timing means.

Claim 9

A temperature control device for providing automatic multiple-temperature control of an air conditioning unit, comprising: a single pair of terminals adapted to be coupled in a series loop circuit with an electromechanical control device and a control voltage cource; multiple temperature-activated switches each of which is operable in response to a corresponding predetermined ambient air temperature; multiple time switch means operable for coupling a selected one of said temperature-activated switches across said terminals; timing means coupled to said time switch means for selectively operating the same; first resistor means coupled in a series loop with said timing means and said terminals when the selected temperature-activated switch is open; and second resistor means coupled in parallel with said timing means between said terminals when the selected temperature-activated switch is closed; said switches, switch means, and resistors cooperatively maintaining substantially constant current from the control voltage source through said timing means.