Open-type fuse cutout with toggle means having a load break extension device

Claim 1

AN OPEN-TYPE DROPOUT FUSE CUTOUT ADAPTABLE FOR LOADBREAK OPERATION COMPRISING, IN COMBINATION, MEANS DEFINING A PAIR OF SPACED LINE CONTACT ASSEMBLIES, A FUSEHOLDER ASSEMBLY INCLUDING A TOGGLE LINKAGE AND A FUSE TUBE PIVOTALLY SUPPORTED ADJACENT ONE END THEREOF TO ONE OF SAID LINE CONTACT ASSEMBLIES, SAID FUSE-HOLDER ASSEMBLY CARRYING A MAIN MOVABLE CONTACT ADJACENT THE OTHER END THEREOF TO MAKE MAIN CONTACTING ENGAGEMENT WITH THE OTHER LINE CONTACT ASSEMBLY, MEANS INCLUDING A FUSE LINK EXTENDING THROUGH SAID FUSE TUBE FOR MAINTAINING SAID TOGGLE LINKAGE IN AN UNDERSET CONDITION, MEANS BIASING SAID TOGGLE LINKAGE TO A COLLAPSED CONDITION, DELAYED-ACTING LOADBREAK MEANS HAVING SEPARABLE CONTACTS AND INCLUDING A LATCHING DEVICE ELECTRICALLY PARALLELING SAID MAIN MOVABLE CONTACT AND SAID OTHER LINE CONTACT ASSEMBLY, WHEREBY MANUAL SEPARATION OF SAID MAIN MOVABLE CONTACT FROM SAID OTHER LINE CONTACT ASSEMBLY WILL NEVERTHELESS CAUSE CONTINUED LATCHED CONTACTING ENGAGEMENT OF SAID DELAYED-ACTING LOADBREAK MEANS FOR A PREDETERMINED TIME, AND SAID LOADBREAK MEANS BEING RESPONSIVE TO A COLLAPSE OF SAID TOGGLE LINKAGE DURING FAULT-CURRENT INTERRUPTION TO EFFECT RELEASE OF SAID LATCHING DEVICE, WHEREBY DURING FAULT CURRENT INTERRUPTION THE FUSE-HOLDER ASSEMBLY MAY FREELY ROTATE ABOUT SAID ONE LINE CONTACT ASSEMBLY TO AN OPEN INDICATING OBSERVABLE POSITION.