Humidity responsive device

Claim 1

IN A HUMIDITY CONTROL DEVICE ADAPTED FOR WALL MOUNTING, A SUBSTANTIALLY FLAT BASE MEMBER ADAPTED TO BE MOUNTED SUBSTANTIALLY PARALLEL WITH SAID WALL, A ROLLER SECURED TO THE OUTSIDE SURFACE OF SAID BASE MEMBER, A HUMIDITY RESPONSIVE ELEMENT MOUNTED ON THE OUTSIDE SURFACE OF SAID BASE MEMBER AND DOUBLED OVER SAID ROLLER IN A PLANE SUBSTANTIALLY PARALLEL TO THE PLANE OF SAID BASE MEMBER, SAID ELEMENT CHANGING IN LENGTH AS THE MOISTURE CONTENT OF THE SURROUNDING AIR CHANGES, A CONTROL SHAFT ROTATABLY MOUNTED ON SAID BASE AND EXTENDING PERPENDICULARLY THEREFROM AND A CAM ON SAID SHAFT BEHIND SAID BASE MEMBER, ACTUATOR MEANS MOUNTED AT THE BACK OF SAID BASE MEMBER INCLUDING SPRING BIASED ELECTRICAL SWITCH MEANS, A FIRST LEVER OPERATING SAID SWITCH MEANS AGAINST ITS SPRING BIAS AND CONNECTED TO ONE END OF SAID HUMIDITY ELEMENT, A SECOND LEVER MOVABLE IN RESPONSE TO ROTATION OF SAID SHAFT AND CONNECTED TO THE OPPOSITE END OF SAID HUMIDITY ELEMENT WHEREBY THE POSITION OF SAID SECOND LEVER DETERMINES THE OPERATING POINT OF SAID ELECTRICAL SWITCH MEANS RELATIVE TO THE LENGTH OF SAID HUMIDITY ELEMENT, AND AN ELONGATED ARCUATE STRAIN RELEASE SPRING CONNECTED BETWEEN AN ANCHOR POINT ON SAID BASE AND SAID SECOND LEVER, WHEREBY UPON THE TENSION OF SAID ELEMENT EXCEEDING A PREDETERMINED VALUE, SAID SECOND LEVER IS PERMITTED TO MOVE IN A DIRECTION TO REDUCE THE TENSION ON SAID HUMIDITY RESPONSIVE ELEMENT, SAID SPRING HAVING A SUBSTANTIALLY CONSTANT SPRING FORCE OVER THE EXTENT OF ITS DEFLECTION.