Thermal responsive actuator

Claim 1

A TEMPERATURE RESPONSIVE FORCE TRANSMITTING DEVICE COMPRISING: A CYLINDER HAVING A BORE FORMED THEREIN, SAID BORE HAVING END PORTIONS OF RELATIVELY GREATER AND LESSER DIAMETER AND HAVING A CONICAL SECTION CONVERGING FROM SAID PORTION OF GREATER DIAMETER TO SAID PORTION OF LESSER DIAMETER, A POWER MEMBER SLIDABLY GUIDED WITHIN SAID PORTION OF SAID BORE OF LESSER DIAMETER, MEANS CLOSING THE END PORTION OF SAID BORE OF GREATER DIAMETER, A THERMALLY EXPANSIBLE SOLID PLUG FILLING SAID BORE INTERMEDIATE SAID LAST NAMED MEANS AND SAID POWER MEMBER AND HAVING A LINEAR COEFFICIENT OF EXPANSION, A SHELL EMBRACING SAID CYLINDER AND HAVING AN END WALL SPACED FROM THE POWER MEMBER CARRYING END OF SAID CYLINDER, AN EXTERNALLY THREADED BOSS EXTENDING OUTWARDLY FROM SAID END WALL OF SAID SHELL AND HAVING A BORE FORMED THEREIN COAXIAL WITH SAID CYLINDER BORE, A POWER ROD SLIDABLY GUIDED WITHIN THE SAID BORE FORMED WITHIN SAID SHELL, A HEAD FORMED ON THE INNER END OF SAID POWER ROD ENGAGEABLE WITH SAID POWER MEMBER, AND SPRING MEANS INTERPOSED BETWEEN SAID HEAD AND SAID END WALL AND BIASING SAID HEAD INTO ENGAGEMENT WITH SAID POWER MEMBER.