Thermally responsive device

Claim 1

A THERMALLY RESPONSIVE DEVICE FOR SENSING THE THERMAL CONDITION OF AN ASSOCIATED ELECTRICAL APPARATUS INCLUDING WINDINGS SUBSTANTIALLY IMMERSED IN AN INSULATING FLUID AND LEADS THROUGH WHICH ELECTRIC CURRENT FLOWS TO AND FROM SAID WINDINGS IN INSTANTANEOUSLY OPPOSITE DIRECTIONS COMPRISING A BASE MEMBER DISPOSED ADJACENT TO AT LEAST TWO OF SAID LEADS AND SUBSTANTIALLY IMMERSED IN SAID FLUID, A CURRENT PICK-UP COIL DISPOSED ON SAID BASE MEMBER FOR OBTAINING AN OUTPUT CURRENT WHICH VARIES WITH THE SUM OF THE CURRENTS IN SAID LEADS, THE LONGITUDINAL AXIS OF SAID OUT BEING SUBSTANTIALLY PARALLEL TO AND CLOSELY PSOITIONED TO THE LEADS OF THE ASSOCIATED APPARATUS, SAID BASE MEMBER INCLUDING A RECESS, ONE OR MORE BIMETALLIC ELEMENTS DISPOSED IN SAID RECESS AND CONNECTED IN SERIES CIRCUIT RELATION WITH SAID COIL TO BE HEATED IN RESPONSE TO SAID OUTPUT CURRENT AND THE TEMPERATURE OF SAID FLUID, MOVABLE CONTACT MEANS DISPOSED IN SID RECESS, ONE END OF EACH BIMETALLIC ELEMENT BEING FIXED TO SAID BASE MEMBER EACH BIMETALLIC ELEMENT BEING FIXED TO SAID BASE MEMBER AND THE OTHER END BEING FREE TO MOVE AS THE THERMAL CONDITION OF SAID APPARATUS CHANGES AND TO ACTUATE SAID MOVABLE CONTACT, AND STATIONARY CONTACT MEANS DISPOSED TO BE ENGAGED BY EACH MOVABLE CONTACT FOR A PREDETERMINED THERMAL CONDITION OF SAID APPARATUS.