Heat operated refrigerator operable on gas or electricity

Claim 1

IN APPARATUS OF THE CLASS DESCRIBED HAVING A REFRIGERATING SYSTEM OF THE TYPE ALTERNATIVELY EMPLOYING GAS OR ELECTRICITY AS POWER SOURCES AND IN WHICH COOLING IS EFFECTED BY A HEAT OPERATED REFRIGERATION UNIT PROVIDED WITH A HEAT RECEIVING PART, THE PART BEING HEATED BY A GAS BURNER HEATING MEANS DISPOSED ADJACENT THERETO AND MEANS FOR SUPPLYING GAS ENERGY TO THE BURNER HEATING MEANS AND ALSO BEING HEATED BY ELECTRICAL HEATING MEANS AND MEANS FOR CONDUCTING ELECTRICAL ENERGY TO THE ELECTRICAL HEATING MEANS, THE COMBINATION OF CONTROL MEANS CONNECTED TO THE GAS ENERGY SUPPLY MEANS AND TO THE ELECTRICAL ENERGY CONDUCTING MEANS WHICH IS OPERABLE TO CONNECT ONE OR THE OTHER OF THE ENERGY MEANS RESPECTIVELY TO ITS ASSOCIATED HEATING MEANS, SAID CONTROL MEANS COMPRISING STRUCTURE DEFINING A CURVED PATH OF CONVEX FORM HAVING AN ELONGATED SURFACE WHICH EXTENDS BETWEEN SPACED FIRST AND SECOND REGIONS AND IN WHICH ALL PARTS OF THE SURFACE INCLUDING THE FIRST AND SECOND REGIONS THEREOF ARE IN A SINGLE PLANE PERPENDICULAR TO THE SURFACE, AN ELEMENT MEANS FOR MOUNTING THE ELEMENT FOR MOVEMENT ON THE ELONGATED SURFACE BETWEEN THE FIRST AND SECOND REGIONS, MEANS FOR HOLDING THE ELEMENT AGAINST THE SURFACE BY FORCE ACTING THEREON IN A DIRECTION PERPENDICULAR TO THE SURFACE, THE CONTROL MEANS BEING OPERABLE TO CONNECT ONLY ONE OF THE ENERGY MEANS TO ITS ASSOCIATED HEATING MEANS RESPONSIVE TO MOVEMENT OF THE ELEMENT TO THE FIRST REGION ON THE ELONGATED SURFACE AND BEING OPERABLE TO CONNECT ONLY THE OTHER OF THE ENERGY MEANS TO ITS ASSOCIATED HEATING MEANS RESPONSIVE TO MOVEMENT OF THE ELEMENT TO THE SECOND REGION ON THE ELONGATED SURFACE, THE HOLDING MEANS BEING OPERABLE TO HOLD THE ELEMENT AGAINST THE ELONGATED SURFACE AT THE FIRST AND SECOND REGIONS AND AT ALL REGIONS OF THE SURFACE BETWEEN THE FIRST AND SECOND REGIONS THEREOF, THE SURFACE BETWEEN THE FIRST AND SECOND REGIONS HAVING A DEPRESSION OR DITCH OF CONCAVE FORM INCLUDING A BOTTOM AND OPPOSING SIDES, EACH OF THE SIDES BEING INCLINED TOWARD A DIFFERENT ONE OF THE FIRST AND SECOND REGIONS, THE ELEMENT, AFTER BEING MOVED FROM EITHER OF THE FIRST AND SECOND REGIONS TOWARD THE DITCH, BEING MOVABLE ON A PART OF THE SURFACE AT EITHER SIDE OF THE DITCH AND ADJACENT THERETO AND ALONG EITHER ONE OF THE INCLINED SIDES OF THE DITCH TO THE BOTTOM THEREOF RESPONSIVE TO A FIRST FORCE IMPARTED THERETO WHICH IS OF ONE MAGNITUDE, AND EACH SIDE OF THE DITCH BEING INCLINED AT SUCH AN ANGLE TO THE PART OF THE ELONGATED SURFACE WHICH IS ADJACENT THERETO AND EXTENDS THEREFROM THAT THE ELEMENT IS MOVABLE ALONG THE SURFACE TOWARD EITHER ONE OF THE FIRST AND SECOND REGIONS FROM THE BOTTOM OF THE DITCH ALONG EITHER ONE OF THE SIDES THEREOF RESPONSIVE TO A SECOND FORCE IMPARTED THERETO AT THE BOTTOM OF THE DITCH WHICH IS OF HIGHER MAGNITUDE THAN THE FIRST FORCE.