Abstract: An assembly for mechanically connecting an electrical cable to the housing of an electrical device comprises a cable jacket with an annular groove filled with a resinous substance such as polyurethane, the resin forming a prism fitted to an aperture in the device housing. The surface defining the groove is roughened and provided with a multiplicity of teeth.

Abstract: An improved synthetic resin insulator comprising a reinforced plastic rod and a holding metal fitting having a sleeve is disclosed. In the insulator, the reinforced plastic rod is firmly secured to the sleeve of the holding metal fitting by a divided die means including at least five pieces, wherein the rod is inserted into the sleeve and the outer surface of the rod is substantially uniformly compressed in the centripetal direction by the inner surface of the sleeve by pressure exerted by each of the five divided die means pieces, so that the outer circumference of the rod is uniformly compressed at an optional cross-section thereof. The insulator is free from cracks and whitening in the rod and has an improved durable life.

Abstract: The invention relates to a corona discharge lightning rod comprising a tip which is isolated from the ground and having a base which is connected via discharge means to the ground, said lightning rod being suitable for ionizing the ambient atmosphere at the end of its tip. An electric circuit is provided for periodically reducing the potential of the tip to a value which is too low to maintain corona discharge, thereby producing periodic and intermittent corona discharge pulses. Preferably, the tip is electrically connected to a potential generator such that the potential (V.sub.0) applied to the tip is a variable potential in the form of recurrent wave trains, and such that the peak value of the first half cycle of the train having a polarity opposite to the polarity of the ambient atmosphere is greater than the threshold at which the corona effect takes place. This need only occur in the presence of the natural amplification (V.sub.

Abstract: An aerial communication cable closure is comprised of a one-piece, hollow, box-like housing with conical ends having an integral hinge formed at the inside upper surface. The closure includes a pair of interconnecting edges separated by an access slot. The edges are fastened together in a mating engagement after passing a cable through the slot. The closure also includes electrically conductive hanger brackets which are attached to the housing, each having interfitting segments allowing the hanger brackets to hinge with the integral hinge formed in the inside upper surface of the housing. When cable termination is desired for the terminating of cable conductors with service wires, a rectangular compartment with an integrally hinged lid is attached to one side of the box-like housing in which a terminal block is mounted.

Abstract: A cord bushing including a body portion and a lid portion defining a passage for holding a cord and being fittable into a first aperture in an outer panel of an electrical apparatus, flanges provided at one end of the body portion and lid portion and having outer diameters greater than the first aperture, grooves formed in the body portion and the lid portion adjacent to the flanges for locking the body portion and the lid portion in the outer panel, and a falling-off preventing bar in the form of a rod extending from the flange of the body portion substantially in the same direction as the passage and adapted to be inserted into a second aperture when the body portion and lid portion are fitted into the first aperture, the falling-off preventing bar being provided with a check member which prevents the falling-off preventing bar from being extracted once it passes through the second aperture.

Abstract: A joint between a pair of electrical cables of different types, such as an oil filled cable and a cable with extruded insulation. Both cable ends have tapered insulation and stepped layers outwardly of the insulation and the conductor of one cable is mechanically and electrically connected to the conductor of the other cable by a rod surrounded by a body of insulation. Portions of the insulation at opposite ends of the body and the tapered insulations are respectively covered by insulation applied thereto during installation of the joint. The tapered insulation of the oil filled cable is enclosed by a housing in fluid tight engagement with the body and the sheath of the oil filled cable and filled with the oil of the oil filled cable. The insulation surrounding a portion of the body and the tapered insulation of the cable with extruded insulation is adhesively bonded to such portion of the body.

Abstract: A strain relief for holding a cable or a plurality of wires against movement relative to a support, such as a multi-part connector or a panel having a hole through which they are passed, has a deformable body advantageously of elastomer and including first and second portions preferably coupled by a strap, the first portion having two spaced ribs with a trough defined between them, the second portion having a base with a transverse wall upstanding on it, the ribs and the wall being disposable such that the cable or plurality of wires are abutted by the ribs, and by the wall between the ribs, and are gripped frictionally and forced into a U-shaped bend, which anchors them against twisting and longitudinal movement relative to the support.

Abstract: A snap-fitting cover assembly for the terminal block (12) of an electrical transformer (10) comprises a backing plate (18) having apertures (20) for receiving terminals (14) of the transformer and adapted to be mounted against the terminal block (12). The width of the backing plate 18) is slightly greater than the width of the terminal block (12) so that opposite side portions (A) of the plate (18) extend beyond the block. A cover (28) adapted to fit over the backing plate (18) and block (12) has a pair of inwardly extending ears (26) that snap fit around the extending portions of the backing plate (18). With the backing plate (18) secured to the transformer terminals (14) by nuts (24), the cover (28) is retained to the terminal block (12) by a seal wire (34) extending through the cover (28) and behind the plate (18).

Abstract: A stop joint between a pair of electrical cables of different types, such as an oil filled cable and a cable with extruded insulation. Both cable ends are terminated in a known manner except that the conductor of one cable is mechanically and electrically connected to the conductor of the other cable by a rod surrounded by a body of insulation, portions of the insulation at opposite ends thereof being respectively covered by the insulation of the terminating elements of one cable and by the insulation of the terminating elements of the other cable. The body has a flange which is clamped to one of the cable terminating elements, and to provide electrical interconnection of the cable shields, the central portion of the body is covered with a semiconductive varnish.

Abstract: An afterset for a cellular raceway. The afterset includes an annular housing, an adjusting ring mounted in the housing, and a split cover for flush mounting removably secured to the adjusting ring. The housing has an internal bridge member which, in conjunction with the housing, forms a pair of power compartments open to the power cell of the cellular raceway and a pair of communication openings respectively open to the communication cells of the raceway, each power compartment has a duplex receptacle disposed below the cover and is accessible from the interior of the housing.

Abstract: An apparatus which routes electrical conductors through a sealed opening in a wall using a flexible printed wiring cable is disclosed. The apparatus includes a thermoplastic material injection molded around a flexible printed wiring cable. Within the molded object, the cable contains two sections where cable conductors are not enclosed within flexible printed wiring insulation. The two sections are separated by a third section in which cable conductors are enclosed within insulation. The cable additionally contains an increased amount of conductor material where the cable enters and exits the molded object. Two O-rings are contained within the periphery of the molded object.

Abstract: A high-voltage insulator which is suitable for use in chambers carrying gas highly charged with solid particles and is used particularly in electrostatic filters used for cleaning an exhaust gas derived from internal combustion engines used to drive motor vehicles. The high-voltage insulator is columnar in structure, having shield-like ribs succeeding one another at intervals, adjacent to each of which in the insulator is one recess. With the remaining insulator parts having a smaller diameter, this recess forms a sharp edge, which defines discharge paths toward the flank of the shield-like ribs. Inside these paths, the insulator is kept free of soot coatings or conductive coatings, so that the insulator itself offers high resistance to leakage currents, which would cause insupportable power losses.

Abstract: A pedestal-type closure for use as a buried telephone cable terminal closure comprises a rear section and upper and lower front covers, each of which is formed from the same basic plastic extrusion. The covers and the rear section are secured in edge-to-edge relationship. The upper ends of the rear section and of the upper cover are formed with cooperating caps that form a venting structure for venting moisture from within the interior of the pedestal and which tend to form a barrier against the entrance of insects into the pedestal. The lower cover has a snap-on arrangement which facilitates assembly, and the rear section has spacers which facilitate mounting of the pedestal against a vertical surface, and wherein the spacers are difficult to dislodge from the pedestal, thereby inhibiting vandalism.

Abstract: An electrical bushing comprises a central conductor supported at the opposite ends of a hollow insulating tube, one end of the central conductor being axially movable relative to the insulating tube. A stationary terminal element is secured and electrically connected to the movable end of the central conductor, and a movable terminal is disposed axially movable relative to the stationary terminal element. An expansion chamber housing with a terminal cap for defining therein an expansion chamber is hermetically attached to the insulating tube to enclose the movable end of the conductor. A flexible conductor is used for electrically connecting the stationary terminal element and the movable terminal element while allowing an axial movement therebetween, and a compression spring axially biases the movable terminal element against the terminal cap to establish an electrical contact therebetween.

Abstract: This invention is generally a longitudinally slit tubular molding member that can be opened up or closed so as to receive electric wires extending therethrough, and comprising a base mountable on a wall and a pivotable cover to enclose the wires, and including hooks for attaching the wires inside the molding member.

Abstract: The present invention concerns a continuous-accessibility electrical conduit comprising: at least one U-shaped case (4) having at least one longitudinal interior partition (10) forming boxes (11); a cover (5) set up to carry conductors and provided with slots (20) that permit access to the conductors, and/or a blind cover (28) forming an empty channel; and snap-lock means (12, 13, 24; 14; 39) provided on the free edges of the lateral walls and the partition of the base, as well as on opposite areas of the covers.

Abstract: An improved protective cover adapted to be suspended on an energized electrical conductor or insulator to protect workmen in the vicinity of the conductor. In one embodiment, the cover is an elongated tubular-shaped member formed by concentrically arranged inner and outer housings maintained in a spaced relationship by a plurality of spacers which provide and maintain an insulating air gap therebetween. A central sleeve is concentrically mounted within the inner housing and together with portions of the inner and outer housings forms a spiral passageway for suspending the cover on a conductor by engagement of the conductor with an inner concave surface of the central sleeve. The inner concave surface of the central sleeve is covered with a conductive material which reduces the strength of the electrical field stress surrounding the energized conductor.

Abstract: Optimum signal/power transmission characteristics are realized in a cable containing a plurality of individually insulated conductors which vary in size one to another wherein the ratio of the size of one conductor to the next larger conductor is about 0.62. Normally, at least three different sizes of conductors will be employed in a cable wherein each size classification differs from the next larger or smaller size classification by the specified ratio. This particular ratio is often called the golden section and is the ratio between the two sizes in which the lesser of the two is to the greater as the greater is to the sum of both.

Abstract: Unauthorized tapping onto ground level cable TV junction connector boxes or the like is prevented by an anti-tapping device which is removably anchored into the ground so that it resists tilting; has a housing enclosing the junction box, and the removal and anti-tilt means; and has a locking means which rotatably mounts the housing so that it readily rotates, thus frustrating attempts to gain access to the junction connectors.

Abstract: A wire bundle and grommet assembly includes a grommet body with an extension and a retention sleeve that slideably fits over the grommet body extension. Respective stop flanges are spaced from one another. The retention sleeve also includes a one-way ratchet means, and flexible retention fingers engageable with cam ramps on the grommet body extension. When the wire bundle is pulled through the aperture, the grommet body extension and retention sleeve move as one through the aperture, until the retention sleeve stop flange anchors on the bulkhead panel. Thereafter, the grommet body extension slides through the anchored retention sleeve, and the cam ramps flex the retention fingers outboard, past the perimeter of the aperture, and into engagement with one surface of the bulkhead panel. The grommet body stop flange concurrently engages the other surface of the bulkhead panel. The ratchet means keeps the various parts in that position, and the assembly is thereby attached to the bulkhead panel.