Abstract: Apparatus for reducing the cross sectional area of a wire comprises stabilizing means arranged to receive the wire and to limit extrusion thereof in a direction transverse to its length and movable projecting means for engaging the wire while restrained by the stabilizing means so as to effect a deformation of the wire and a concomitant reduction of its cross sectional area.

Abstract: An electric cutout includes a fuseholder in which a fusible element is mounted, a conducting element pivotally mounted to the lower end of the fuseholder and having a pair of trunnions disposed within a pair of spaced jaws on which a pair of guide surfaces are respectively mounted for cooperation with complementary guiding surfaces of arcuate configuration on the conducting element so that rotation of the fuseholder and conducting element about the trunnions may be effected in such manner that the trunnions are securely held against the bight portions of the jaws thereby to prevent rocking action of the fuseholder during closing movement thereof, an ejector latching element pivotally mounted on the conducting element and arranged to eject the fusible element upon rupture thereof and also arranged to engage a part of the fuseholder so as to prevent relative movement between the conducting element and the fuseholder, a U-shaped contact fixed in position adjacent the jaws and arranged to engage opposite surfaces

Abstract: A fuse striker affords a visual or other indication of an operated condition of an associated fuse and is mounted within the fuse and comprises a housing structure coaxially arranged within the fuse with an end of the housing in contact with an end of the fuse, closure structure for the opposite end of the striker housing and comprising mating half sections with a longitudinal groove formed in at least one complementary surface through which an elongated high resistance ignition element extends and which is in shunt with the fusible elements of the fuse so as to contact with pyrotechnic material interposed between the closure means and a cup like piston element having an outwardly flared lip portion whereby ignition of the pyrotechnic element drives the piston toward the opposite end of the housing so as to thrust a striker pin mounted therein through the fuse cap so as to afford a visual indication of the operated condition of the fuse, the pyrotechnic material being ignited upon rupture of the fusible eleme

Abstract: An electric switch of the snap-action type includes a pair of relatively movable contacts, an operating linkage interconnected with a movable one of the contacts for imparting operating movement thereto, a hollow tubular rotatable member interconnected with the operating linkage and operable to impart switch operating movement thereto, a latching part secured to the rotatable member and engageable with abutment means so as to secure the rotatable member against rotation, spring means in the form of a torsion bar disposed within the rotatable member and effective to impart rotation thereto upon disengagement of the latching part from the abutment means, movable motive means in the form of a rotatable tube interconnected with the torsion bar for imparting twisting moment thereto together with latch releasing means mounted on and movable with the movable motive means for engaging the latching part and for moving such part out of engagement with the associated fixed abutment means after a predetermined degree of

Abstract: A telescoping tool includes a plurality of telescoping tubes interconnected by coupling means each of which comprises an exteriorly threaded sleeve secured to one end of an outer telescoping tube and having an inner outwardly tapered surface a part of which is of the configuration of a truncated cone, a tubular wedge having an outer surface of complementary configuration to said part of the inner surface of said sleeve together with an outwardly projecting coupling element preferably in the form of an exterior flange together with a cap sleeve having internal threads and which is threadedly related with the exterior surface of the sleeve and arranged when tightened to force the tubular wedge into the sleeve and toward the adjacent end of the outer tube so as to grip frictionally the exterior surface of an inner telescoping tube and thereby to secure the telescoping tubes together in frictional relationship, an inner recess or groove being formed interiorly of the cap sleeve and adjacent its cap portion for re

Abstract: A fuse mounting arranged to isolate live electric parts and provided with grounded exposed parts comprises a housing structure, a hingedly mounted fuse panel disposed within said housing structure and normally forming a part of a fuse isolating wall within said housing structure, fuse mounting means secured to the interior of said fuse panel so as to isolate a fuse mounted on said fuse mounting means, conducting means in the form of an electric bushing and its associated bushing well mounted on and projecting through said fuse panel and forming a connection between one terminal of the fuse, disjointable connecting means in the form of an elbow connector engageable with said bushing on the exterior of said fuse panel and outside said isolating wall to form a disjointable electric connection with said bushing, and latch means movably mounted on said fuse panel and engageable with a locking slot formed in said isolating wall for removably securing said fuse panel in its normal position in said isolating wall.

Abstract: A surge arrester of compact construction includes a housing formed preferably of elastomeric material through which a pair of spaced terminals protrude and between which a stack of metal oxide varistor discs is disposed and connected in series therewith. Disposed below the lower one of the discs and in contact therewith is a conductive base plate and an electrode is spaced somewhat from the lower surface of the base plate to form a gap and is provided with shunt means connecting the electrode with the upper surface of the lower disc so that an overvoltage surge condition and the resulting arc across the gap establishes a shunt circuit around the lower disc.

Abstract: An enclosing structure for an electric fuse having a fusible element disposed within a tubular casing of insulating material and interconnected at its ends with terminals mounted on the casing ends comprises an elongated tubular enclosure formed of insulating and semiconducting material and disposed about the fuse with its inner surface in heat transferring surface contacting relation therewith and a rigid metallic heat absorbing sleeve imbedded in the elongated enclosure to absorb heat therefrom and to impart a degree of mechanical strength thereto. Semiconducting sleeves which form parts of the tubular enclosure include an outer sheath which is grounded and inner sleeve elements arranged so as to isolate the fuse and the contacts of the fuse enclosing structure thereby to inhibit corona discharge from the conducting parts.

Abstract: A current limiting fuse and an oil expulsion or weak link type fuse are connected in series with each other and with a transformer primary winding and a grounded element having a part disposed adjacent one end of the expulsion fuse is arranged so that an arc drawn upon operation of the expulsion fuse is directed to the grounded element in such manner as to cause the current limiting fuse to operate and interrupt the flow of current through the primary winding. The system is applicable to single phase or multiple phase arrangements.

Abstract: An electric terminal such as a transformer bushing having a contact socket of conducting material is provided with a quench tube arranged in aligned substantially coaxial relation with the contact socket. An associated connector which may be of the elbow type is provided with a contact pin which includes a tubular element of conducting material having an end of reduced diameter on which a hollow sleeve is disposed thereabout and formed of strong plastic material having an enlarged end nose portion of the same or of a different plastic material together with a sleeve of arc extinguishing material which is disposed about the plastic sleeve and arranged with one end in snug engagement with the enlarged end portion which is bevelled at its outer end to facilitate entry of the contact pin into and through the quench tube and into the contact socket so as to form a connection between the contact socket and the tubular element of conducting material.

Abstract: An arrangement for preventing relative rotation of electric terminals during a tightening operation comprises an electric conductor terminal having an electric contact surface through which an aperture extends and an associated terminal having a cooperating contact surface from which an integral stud protrudes, said stud being disposed within said aperture and having an associated fastening nut threadedly related with said stud for holding said contact surfaces in face contacting relation and said stud and said aperture being related by specially configured complementary portions for preventing relative rotation therebetween.

Abstract: An electric elbow connector comprises an L-shaped hollow housing structure formed of insulating material and of semi-conducting material which contains an elongated contact sleeve having a hollow sleeve portion at one end and an integral shank at the other end, the shank having an outer end portion of substantially larger transverse dimension than its inner portion and the outer portion of the shank being of a hardness considerably greater than the hardness of the inner portion of the shank and of the hollow end portion of the contact sleeve, and a contact pin in electric contact with the hard outer end portion of the shank of the contact sleeve and disposed within the housing.

Abstract: An electric terminal bushing having a hollow tubular contact engageable with the contact pin of an electric elbow type connector is arranged so as substantially to reduce the arcing time during a switch closing operation and includes means for slidably mounting the hollow tubular contact within the bushing between normal and interim positions, and spring means arranged to move said contact toward its normal position following movement of said contact toward its interim position during a circuit closing operation.

Abstract: An electric terminal bushing having a hollow tubular contact engageable with the contact pin of an electric elbow type connector is arranged so as substantially to reduce the arcing time during a switch closing operation and includes means for slidably mounting the hollow tubular contact within the bushing, magnetic means connected in series with the contact for imparting sliding closing movement thereto in response to the striking of an electric arc between the contact pin and the tubular hollow contact, and latch means mounted on said hollow tubular contact for engaging a part of the bushing so as to hold said tubular contact in its circuit closed position following movement of said contacts to their closed circuit positions.

Abstract: An electric terminal such as a transformer bushing having a contact socket of conducting material is provided with a quench tube arranged in aligned substantially coaxial relation with the contact socket. An associated connector which may be of the elbow type is provided with a contact pin which includes a tubular element of conducting material to the end of which a stem of mechanically strong plastic material is affixed to support a hollow sleeve disposed thereabout and formed of arc extinguishing material and which is bevelled at its outer end to facilitate entry of the contact pin into and through the quench tube and into the contact socket so as to form a connection between the contact socket and the tubular element of conducting material.

Abstract: An electric terminal bushing having a hollow tubular contact engageable with the contact pin of an electric elbow type connector is arranged so as substantially to reduce the arcing time during a switch closing operation and includes means for slidably mounting the hollow tubular contact within the bushing and magnetic means connected in series with the contact for imparting sliding closing movement thereto in response to the striking of an electric arc between the contact pin and the tubular hollow contact.