Calibration means for temperature responsive device

Claim 1

A THERMOSTATIC CONTROL DEVICE COMPRISING A HOUSING ENCLOSING A TEMPERATURE RESPONSIVE EXPANSIBLE MEMBER, A SNAP-ACTING SPRING MECHANISM, AND AN ELECTRICAL SWITCHING MEANS, THE EXPANSIBLE MEMBER BEARING UPON THE SPRING MECHANISM FOR CHANGING THE LOADING THEREON AS A FUNCTION OF TEMPERATURE, THE SPRING MECHANISM BEING CONNECTED TO THE SWITCHING MEANS AND SERVING AS A SWITCH ACTUATOR FOR MAKING AND BREAKING AN ELECTRICAL CIRCUIT, IN WHICH THE CONTROL DEVICE IS ADAPTED TO BE INSTALLED, THE EXPANSIBLE MEMBER BEING CARRIED ON AN ADJUSTABLE SHAFT WHICH EXTENDS OUTWARDLY OF THE HOUSING AND SERVES AS A MANUALLY SETTABLE MEANS FOR VARYING THE AVERAGE TEMPERATURE CONTROL POINT OF THE DEVICE, ADJUSTABLE MEANS FOR MOUNTING THE SAID SHAFT IN AND THROUGH ONE WALL OF THE HOUSING, SAID ADJUSTABLE MEANS INCLUDING A SHOULDERED BUSHING LOCATED WITHIN AN OPENING IN SAID ONE WALL, THE SHAFT BEING THREADED THROUGH THE BUSHING, AND A DEFORMABLE ANNULAR CLIP MEMBER FIXED TO THE OUTER END OF THE BUSHING FOR HOLDING THE BUSHING IN THE WALL OPENING AND PREVENTING THE BUSHING FROM TURNING, THE ANNULAR CLIP MEMBER HAVING AN OUTER PERIPHERY WITH SPACED TEETH, AND AN INDEXING MEANS FOR ENGAGING AND TURNING THE CLIP MEMBER SO AS TO TURN THE BUSHING WHILE THE SHAFT IS ADAPTED TO BE HELD FROM TURNING SO AS TO MOVE THE SHAFT THROUGH THE SUPPORTING WALL OF THE HOUSING, THE INDEXING MEANS BEING A PINION THAT HAS A PILOT PIN SEATED IN A WALL OF THE HOUSING, THE PINION BEING ADAPTED TO MESH WITH THE SAID TEETH FOR TURNING THE CLIP AND BUSHING AS A UNIT.