Apparatus for controlling heating systems

Claim 1

IN A HEATING SYSTEM OF THE CLASS HAVING A LOW LIMIT THERMOSTAT LOCATED IN A SPACE TO BE HEATED, THE COMBINATION WITH A HEAT SOURCE AND A SERIES OF HEATING ELEMENTS COMMUNICATING WITH SPACE TO BE HEATED, OF MEANS FOR CONTROLLING THE DELIVERY OF HEAT TO SAID HEATING ELEMENTS INCLUDING AN ELECTRICAL CIRCUIT AND A THERMOSTAT FOR OPERATING SAID HEAT SOURCE, SAID THERMOSTAT CONSISTING OF A BOURDON TUBE CONTAINING A BODY OF TEMPERATURE RESPONSIVE FLUID LOCATED AT THE HEAD OF THE INSTRUMENT AND A BULB CONTAINING A SECOND BODY OF SAID FLUID LOCATED REMOTE FROM THE FIRST BODY BUT CONNECTED THEREWITH BY CAPILLARY TUBING, SAID BULB BEING LOCATED IN SUCH A POSITION THAT IT RESPONDS PROMPTLY TO CHANGES IN TEMPERATURE OF THE OUTDOOR ATMOSPHERE MEANS COMPRISING A HOUSING IN WHICH ONE END OF THE BOURDON TUBE IS SECURED, SAID HOUSING BEING MOUNTED CLOSELY ADJACENT TO, BUT SPACED FROM, ONE OF SAID HEATING ELEMENTS WHEREBY THE BOURDON TUBE RESPONDS TO TEMPERATURE CHANGES IN THE AMBIENT ATMOSPHERE IMMEDIATELY SURROUNDING THE HOUSING, SAID ELECTRICAL CIRCUIT INCLUDING A NORMALLY CLOSED TIME SWITCH HAVING SAID LOW LIMIT THERMOSTAT SHUNTED ACROSS THE TERMINALS THEREOF, AND ELECTROMECHANICAL SWITCH APPARATUS ADAPTED TO SUPPLY CURRENT TO THE HEATING SOURCE WHEN EITHER THE TIME SWITCH OR THE LOW LIMIT THERMOSTAT SWITCH IS CLOSED, SAID ELECTROMECHANICAL SWITCH APPARATUS INCLUDING A SWITCH SUPPORT ADJUSTABLY SECURED IN THE HOUSING, MEANS FIXED ON SUCH SWITCH SUPPORT AND RESPONSIVE TO MOVEMENT OF THE FREE END OF THE BOURDON TUBE FOR OPERATING THE HEAT SOURCE AT PREDETERMINED INTERMITTENT INTERVALS IN ORDER TO MAINTAIN A DESIRED NORMAL TEMPERATURE AT THE SPACE TO BE HEATED, AND DUAL SWITCH MEANS MOUNTED IN THE HOUSING ADJACENT TO THE BOURDON TUBE AND OPERATIVE WHEN THE TIME SWITCH IS OPENED AND ALSO RESPONSIVE TO MOVEMENT OF THE FREE END OF THE BOURDON TUBE FOR PERIODICALLY OPERATING THE HEAT SOURCE FOR AN INTERVAL OF TIME SUFFICIENT TO RAISE THE TEMPERATURE OF THE SPACE TO BE HEATED TO A VALUE EXCEEDING IN PREDETERMINED DEGREE THE SAID DESIRED NORMAL TEMPERATURE.