Thermal switch with thermally collapsible member

Claim 1

A SWITCH COMPRISING: A CYLINDRICAL ELECTRICALLY CONDUCTIVE CASING WITH AN ELECTRICALLY CONDUCTIVE END WALL AND AN INSULATIVE END WALL; A FIRST LINE CONDUCTOR CONNECTED TO SAID CONDUCTIVE END WALL; A SECOND LINE CONDUCTOR EXTENDING THROUGH SAID INSULATIVE END WALL WITH A LINE CONTACT IN SAID CASING; A CONDUCTIVE DISC HAVING AN EDGE CONTACTING THE INTERIOR OF SAID CASING; A THERMALLY COLLAPSIBLE PELLET ADJACENT SAID CONDUCTIVE END WALL; A CYLINDRACEOUS SPACING MEMBER OF SUBSTANTIAL AXIAL LENGTH ADJACENT SAID CONDUCTIVE DISC; A THERMALLY COLLAPSIBLE PELLET ADJACENT SAID CONDUCTIVE END WALL; A STRONG SPRING OUTSIDE SAID PELLET WITH ONE END ADJACENT SAID PELLET AND WITH THE OTHER END PUSHING SAID SPACING MEMBER TO PUSH SAID DISC AGAINST SAID LINE CONTACT WHILE SAID PELLET IS NOT COLLAPSED; A WEAK COIL SPRING SURROUNDING SAID SECOND LINE CONDUCTOR AND MOVING SAID SPACING MEMBER WITH SAID DISC AWAY FROM SAID LINE CONTACT WHEN SAID PELLET IS COLLAPSED, SAID CONDUCTIVE CASING HAVING A VIEWING MEANS OF LIMITED SIZE TO PERMIT DIFFERENT VIEWING OF SAID SPACING MEMBER WHEN SAID PELLET IS COLLAPSED AND IS NOT COLLAPSED AND IN WHICH A CYLINDRACEOUS INSULATIVE CASING SURROUNDS SAID CONDUCTIVE CASING AND IN WHICH SAID FIRST AND SECOND LINE CONDUCTORS EXTEND ENDWISE OUT OF SAID INSULATIVE CASING AND IN WHICH SAID INSULATIVE CASING CONTAINS ELECTRICAL HEATING MEANS EFFECTIVE ON SAID PELLET; AND ELECTRICAL CONNECTING MEANS EXTENDING ENDWISE OUT OF SAID INSULATIVE CASING AND BEING CONNECTED TO SAID HEATING MEANS.