Circuit interrupting device

Claim 1

A FLUID-BLAST LONGITUDINAL-FLOW CIRCUIT INTERRUPTER INCLUDING A RELATIVELY STATIONARY OPERATING CYLINDER, AN ANNULAR PISTON DISC MOVABLE LONGITUDINALLY OF SAID OPERATING CYLINDER INTERIORLY THEREOF TO COMPRESS FLUID THEREIN, RELATIVELY MOVABLE CONTACT STRUCTURE INCLUDING A POST-TYPE RELATIVELY STATIONARY CONTACT AND A ROD-SHAPED COOPERABLE MOVABLE CONTACT, A CONDUCTING OPERATING ROD MOVABLE LONGITUDINALLY OF SAID OPERATING CYLINDER AND HAVING ONE END THEREOF CONNECTED TO SAID ROD-SHAPED MOVABLE CONTACT, A MOVABLE SUPPORTING SPIDER OF SMALLER OUTER DIAMETER THAN THE INTERNAL DIAMETER OF THE OPERATING CYLINDER SECURED TO THE OPERATING ROD AT THE POINT OF ATTACHMENT OF THE MOVABLE ROD-SHAPED CONTACT WITH THE OPERATING ROD, A CYLINDRICAL SHIELD MEMBER OF SMALLER OUTER DIAMETER THAN THE INTERNAL DIAMETER OF THE OPERATING CYLINDER SECURED AT ONE END TO SAID MOVABLE SPIDER AND EXTENDING TOWARD THE STATIONARY CONTACT SURROUNDING THE ROD-SHAPED MOVABLE CONTACT, THE OTHER END OF THE CYLINDRICAL SHIELD MEMBER BEING SECURED TO SAID MOVABLE PISTON DISC TO CAUSE THE ACTUATION THEREOF, AN INSULATING ELONGATED TUBULAR-LIKE ORIFICE MEMBER HAVING AN ELONGATED ORIFICE OPENING THEREIN SECURED TO SAID PISTON DISC AND MOVABLE THEREWITH, THE ARRANGEMENT CAUSING THE CONTACT-TIP PORTION OF THE ROD-SHAPED MOVABLE CONTACT TO BE POSITIONED CLOSELY ADJACENT THE INLET PORTION OF THE ORIFICE OPENING WITH ANNULAR CLEARANCE COMPLETELY AROUND THE TIP PORTION OF THE MOVABLE CONTACT FOR UNIMPEDED FLUID FLOW, THE POST-TYPE RELATIVELY STATIONARY CONTACT EXTENDING THROUGH THE ELONGATED ORIFICE OPENING TO ENGAGE THE MOVABLE CONTACT IN THE CLOSED POSITION OF THE INTERRUPTER, A RESULTING LONGITUDINAL FLOW THROUGH THE ELONGATED ORIFICE OPENING DURING THE OPENING OPERATION CAUSING EXTINCTION OF THE ARC ESTABLISHED AXIALLY OF THE ELONGATED ORIFICE OPENING, SAID CYLINDRICAL SHIELD MEMBER PREVENTING FLASHOVER EXTERNALLY OF THE PISTON DISC FOLLOWING ARC INTERRUPTION, AND THE RELATIVELY SMALL DIAMETER OF THE SHIELD MEMBER AND SPIDER PREVENTING THE OCCURRENCE OF FRICTIONAL LOSSES ALONG THE OPERATING CYLINDER DURING THE OPENING OPERATION.