Abstract: The invention concerns a bushing device (12) designed to be fitted through a hole in a wall including a body (20) and a cover (18) each adapted to be disposed on one side of the wall and rod and connection (14, 16) for connecting the body (20) and the cover (18) to grip said wall between them, the body (20) and the cover (18) including aligned passages (22, 47) adapted to receive a conductive rod (14). The cover (18) includes an inner core (44) delimiting the passage (47) for receiving the rod (14) and an outer sheath (46) covering the lateral wall of the inner core (44), the inner core (44) and the outer sheath (46) being made of different materials.

Abstract: A power transformer is provided with a housing having a plurality of apertures for receipt of a bushing well of a bushing assembly. Each bushing assembly includes a bushing well adapted to be secure in one aperture of the power transformer, and a bushing adapted to be connected to a terminal in the bushing well to permit the conducting of electric current between the bushing assembly and the transformer. The bushing assembly further includes a connector for connecting the bushing conductor to a terminal positioned in the bushing well. The power transformer includes a cap to cover and isolate the unused bushing wells. The cap is preferably a plate structure that attaches to the lip of the bushing well and uses the dielectric formed by the air enclosed by the cap and the bushing well to prevent sparking over to adjacent sites, corona discharge, and accidental contact with a live terminal therein, and to guards against contamination of the bushing well.

Abstract: A connector for facilitating the connection of electrical conduit or cable to junction box, which is fashioned from a single piece of material, and features a saddle member and rolled throat that are integral parts of the connector. These integrated features simplify manufacturing and ultimate use of the disclosed connector.

Abstract: An enclosure for telecommunications equipment has one or more swivel stubs extending from the sides of the enclosures. When enclosures are mounted stacked end to end on a wall, access to a swivel stub is not prevented by other enclosures, thereby allowing an enclosure to be added or replaced without having to remove any other enclosures. In one embodiment, the configuration of the enclosures does not limit the number of enclosures that can be stacked end to end. The present invention removes the need for a special mounting bracket to provide clearance for the swivel stubs between the back of the enclosure and the mounting surface.

Abstract: A waterproofing member for a wire harness connecting portion of a motor for driving a window regulator of a vehicle is constructed such that it includes an opening being provided at each axial direction end portion of the waterproofing member, a mounting portion provided at one of the axial direction end portions of the waterproofing member, and fixed to the wire harness connecting portion so as to seal the wire harness connecting portion; a press-fit portion provided at the other of the axial direction end portions of the waterproofing member, and press-fit against a peripheral wall of the through-hole of the door panel so as to seal the through-hole; and further includes an elastic portion which is formed at an axial direction intermediate portion between the mounting portion and the press-fit portion and is formed so as to be elastically deformable along an axial direction of the waterproofing member, which elastic portion being able to change relative positions of the mounting portion and the press-fit po

Abstract: A grommet assembly includes a main grommet body including first and second surfaces opposite one another. The first surface includes a sealing portion. A pivotable pressing member operatively associated with the main grommet body applies a pressing force to the second surface. The grommet assembly may include a rigid plate member including opposed tabbed hinge portions that receive a pivotable arm pivotable between a first position to apply a pressing force to the sealing portion and a second portion to release the pressing force. The grommet assembly may be attached to a vehicular wall panel by inserting the grommet into an opening of the wall panel, engaging a pressing member associated with the main grommet body with a bracket mounted on the wall panel, and pivoting the pressing member to apply a pressing force that seals connection between the main grommet body and the wall panel. The method may be carried out without accessing or modifying an interior portion of the wall panel.

Abstract: There is provided a strain-relief, liquid tight for connecting conduit or the like to a bulkhead such as an electrical box, with the connector having a body having front and rear portions, and a substantially hollow inner throughbore formed along a longitudinal axis thereof. The front portion of the connector body is adapted for attachment to a bulkhead. A flexible seal member is mounted at least partially within the hollow inner throughbore for receiving a conduit inserted therethrough, this seal member facilitating a substantially liquid tight seal about an inserted conduit during use. An at least partially hollow grip for selectively gripping the conduit is included, and a clamp nut is telescoped over the rear portion of the body for selective longitudinal adjustment therealong. The longitudinal adjustment of this clamp nut provides inward radial compression of the flexible grip about the conduit.

Abstract: A conventional feedthrough connector having a plurality of separate passages is secured in a hole in a bulkhead, followed by feeding separate wire bundles through the separate passages. Two potting dams are secured to the connector, one at each side of the bulkhead. Each potting dam has a collar encircling a projecting cylindrical stem of the connector and tightly secured thereto, and separate integral tubular segments encircling the wire bundles, respectively. The tubular segments are soft pliant material and are gathered tightly around the wire bundles. Settable sealant is injected through a conduit that opens into the collars to fill the collars and the connector passages, and thereby seal the wire bundles in the connector.

Abstract: An arrangement for sealing the inlet area of a substrate extending lengthwise in a housing, preferably a communications cable in a sleeve, has the following features:a) a tube (3) in the form of an elastomer hyperboloid is placed on a cable and has plastic moldings (4,5) at each of its ends firmly attached to the tube (3);b) the elastomer tube (3) is under lengthwise-axial pressure, so that the central portion of the tube (3) is firmly pressed against the substrate (2) surface,c) the tube (3) with its attached moldings (4,5) is located in a hollow body (9), which maintains the lengthwise-axial pressure; andd) the hollow body (9) is attached to the inlet area of the housing (1) and is sealed with respect to the inlet opening.

Abstract: A corrosion resistant hub with a metal insert and an elastomeric outer shell forms a coupling to join a conduit to an enclosure. The metal insert which serves as a grounding mechanism for the conduit comprises internal threads, located near the conduit receiving end of the insert, to connect the conduit to the hub, and external threads, located at the wire exiting end of the insert to connect the hub to the enclosure. A shell made of semi-rigid elastomeric material is molded onto the outer surface of the metal insert. The shell has an annular flange, a hexagonally shaped torquing section and a collar. The annular radial flange forms a reliable seal of the interface between the insert and the enclosure. The collar has a lip that forms a first seal of the junction between the conduit and the insert and internal threads that engage the conduit to provide a second seal of the junction between the conduit and the insert. The hub also has a bushing which is unitary with the shell via an aperture in the insert.

Abstract: A cable re-entry assembly for feedthroughs and the like is provided. The preferred embodiment includes an expansion mandrel positionally secured on the conduit with a heat shrinkable locking ring, a transition boot with a heat shrinkable sleeve portion and a rigid body portion which couples to a feedthrough nut, and a sealant between the conduit and the sleeve. Upon re-entry and re-use of the assembly, the mandrel mechanically expands the sleeve, when the sleeve is re-heated above its crystalline transition temperature, the expansion mandrel is translated against the sleeve and both the conduit and expansion mandrel are withdrawn from the sleeve. Following repair, the conduit is reinserted into the dimensionally unstable sleeve which is then heated to shrink about and reseal the conduit.

Abstract: A post-mounted device for mounting over an electrical transformer output post extends through an orifice in a wall of the electrical transformer with the post-mounted device having a body positioned on a first side of the wall and a cover positioned on a second side of the wall, with fasteners used to clamp the wall between the body and the cover. The post-mounted device includes a portion that restricts pivotal motion of the cover relative to the wall and a gasket provided in this portion seals the cover against the wall. The cover also includes a stepped cylindrical opening at an end of the cover opposite from the end of the cover that seals against the wall, with the stepped cylindrical opening containing a gasket in its smaller diameter portion for radially sealing against the output post, and a stepped spacer that is partially contained within the smaller diameter portion and partially contained within the larger diameter portion of the stepped cylindrical opening.

Abstract: A terminal assembly is provided which is easy to assemble and disassemble. The assembly features male and female ceramic elements that interconnect and provide a passageway into which a terminal equipped with forward and rearward tabs is placed. After the terminal is positioned in the passageway, the forward tabs may be bent into a position at an angle to the terminal, thereby securing the terminal in place and holding the terminal assembly together. The male ceramic element is provided with a unique annular depression that reduces the amount of ceramic materials needed to make the assembly, while also providing the minimum surface spacing required by industry standards. In addition, the terminal assembly is provided with a v-shaped attachment element for conveniently attaching the assembly to a lead wire.

Abstract: A utility line support structure for use as a tangent crossarm or deadend including a hollow fiber reinforced beam with a bushing inserted into a transverse hole in the beam. Bushing includes a hollow inner member for receiving a bolt and a pair of integral washers arranged on opposite ends of inner member and against an outer surface of the beam. The hollow inner member and the integral washers cooperate to support axial loads applied by the bolt. End caps extend over opposite ends of the beam to seal the beam so as to prevent moisture from entering the beam. Also, a method for adapting a non-standard-sized utility line support beam to be compatible with standard-sized tooling.

Abstract: A self-backing cable bushing for offsetting an electrical conduit passing through a knock out or opening in a structural member. The bushing has face and backing flanges connected by a living hinge. An annular tubular projection with peripheral ramp lugs extends from the face flange. The cable bushing may be installed by locating the face and backing flanges on opposite sides of the knock out and inserting the ramp lugs into the circular hole in the backing. This face retains backing flange in parallel, closely-spaced relation with the surface of offset between them. The bushing may thus be used to protect an electrical conduit from contacting the edges of a variety of knock out shapes.

Abstract: An electrical cable holding case that can prevent a charged resin material for sealing from cracking by blocking the sharp bending of electrical cables when they are taken out of the case is provided. An electrical cable holding case includes a cylindrical case main body and a lid-like rear holder having electrical insertion holes and resin charging holes. Electrical cables taken out of the case main body via the electrical cable insertion hole of the rear holder are embedded by resin molding from the case main body to the outer surface of the rear holder to hold the electrical cables so as to be watertight. Electrical cable support walls are arranged at the edges of the electrical cable insertion holes outside the rear holder.

Abstract: The connector permits wires to be used to conduct signals through a fluid-tight boundary. The wire sheath is removed around a medial portion of the wire to expose the surface of the inner conductor. A sealing material contacts the inner conductor surface and also the adjacent sheath surfaces, thereby defining a serpentine boundary which inhibits fluid leakage along the wire surface. The connector is secured to a circuit board which simplifies the assembly of the connector into a blind aperture. A biasing member disposed between the connector and the circuit board operates to hold the connector within the aperture.

Abstract: A grommet having a groove that corresponds in size to a hole in a wall, and a boot extending from the grommet in the shape of a nipple which forms an outer wall. The grommet also includes an inner wall that extends radially inwardly in the same plane as the wall to which the grommet is mounted, the inner wall defining an aperture through which the wire or bundle of wires passes. The outer wall and inner wall define a chamber for collecting water that enters the inside of the boot. The outer wall further defines a slot through which the collected water drains to remove the water from the inside of the boot.

Abstract: An electrical connector assembly for coupling non-metallic electrical conduit to an electrical box via a snap-fit. The electrical connector assembly includes a snap nut adaptor with an annular groove at one end forming a first mating member, and a conduit connector with resilient latch tabs forming a second mating member. Upon inserting the snap nut adaptor through a hole or knockout opening in an electrical box, the conduit connector is securely coupled thereto by inserting it over the snap nut adaptor until the latch tabs engage the annular groove via a snap-fit.

Abstract: A step-transformer drum formed with throughgoing apertures each centered on a respective axis has a contact assembly in each aperture having an insulating washer lining the aperture and having an inside part lying on an inside surface of the drum and an outside part lying on an outside surface of the drum. A stud has an enlarged head bearing outward on the inside washer part and a shaft projecting through the washer past the outside washer part and formed outside the outside washer part with a transversely throughgoing hole. A pin extends transversely through the hole and bears inwardly on an outwardly directed ramp so that rotation of the stud and pin in one direction relative to the structure makes the pin ride up on the ramp and tightens the stud in the aperture and opposite relative rotation loosens the stud.

Abstract: A terminal bushing which has (a) an elongated central conductor made by a powder metallurgy process from metal particles sintered together at elevated temperatures after being compacted under pressure and (b) a tubular shell of polymeric insulating material molded under high within a mold pressure about the central conductor and forming a joint with the central conductor that has a high resistance to leakage along the conductor. The central conductor includes at opposite ends of the molded tubular insulating shell mold-interface regions that are formed by the powder metallurgy process and are located to interface with and to fit tightly within the mold that is used for molding the insulating shell, thereby limiting to low values the quantity of pressurized polymer ejected about the mold-interface regions during the molding.

Abstract: An overvoltage protector assembly and a method of attaching a terminal member through a dielectric body. The assembly has a dielectric body, and line terminal members extending through the body into a chamber within. The terminal members each have a shaft passing through the body and first and second radially extending, opposing abutment surfaces which engage inner and outer surfaces of the body. The body is compressed between the opposing abutment surfaces in an axial direction of the shaft to deform the body inwards to sealingly engage the terminal member between the opposing abutment surfaces. The body is formed with axial projections around apertures receiving the line terminals, so that compressing the body results in displacement of material of the body to form annular projections sealingly engaging around the shaft between the abutment surfaces. Peripheral surfaces of the terminal member are cooperable with the body to prevent relative rotation of the body and the terminal member.

Abstract: A hermetic terminal assembly arrangement for an opening extending through a wall housing panel wherein the opening periphery is threaded to adjustably receive an externally threaded annular sleeve through which a current conducting pin extends, the terminal assembly arrangement including a first seal between the pin and annular sleeve and a second compressible seal between the sleeve and housing.

Abstract: A connector for coupling an electrical conduit in an aperture in a support having a wall of variable thickness. The connector includes a body member having resilient legs with locking tongues on one end and a conduit retaining formation on the other end, and a frusto-conical spring coupled to the body member. The spring is integrally coupled to the body member between the locking tongues and retaining formation. The connector is sealingly engaged with the support by engagement of the spring on one side of the support and engagement of the locking tongues on the other side.

Abstract: A connector for passing continuous insulated electrical conductors such as pins or multi-stranded wire through a surface or bulkhead, while preventing leakage of liquids and gases along the conductors, especially between gaps in the strands. An exemplary connector comprises a body having seal-zone openings in which a sealant is applied and cured around a compressed bared section of multi-stranded wire. The body contains strain relief members adjacent to the sealed openings to provide longitudinal as well as transverse strain relief. A sealant member and radially spaced clasps are located around the sealed openings and strain relief members so that the connector may be removably twist-locked onto a bulkhead without disturbing the sealed wires. A method is defined for achieving the sealed pass-through of electrical conductors.

Abstract: A receptacle connector and a plug connector for connecting a coaxial cable of 75 ohms or greater to a printed circuit board without affecting the outside configuration of their shells. At one end, the receptacle connector forms a spring contact receiver portion for resiliently retaining the plug end of the plug connector. The plug connector terminates a coaxial cable at its other end. The receiver portion of the receptacle connector is right-angled to a three-legged terminal section for solder connection at the printed circuit board. The receptacle and plug connectors comprise an outer shell member, a dielectric member, and a center conductor. The shell members are stamped and formed to maintain an exact constant inside diameter to the shells. The center conductors are stamped and formed to maintain an exact but variable outside diameter which is used to change the terminating impedance of the respective connector.

Abstract: A device for waterproofing around a terminal bolt comprising an electric insulator secured on a shank of the terminal bolt, which is located inside a casing a grommet, made of an elastic material, is tightly fitted in an opening of the casing that is located in contact with the electric insulator at the bottom of the grommet. The grommet has an insertion hold through which the outer portion of the terminal bolt, which projects from the casing, extends. A rigid sleeve, which has a top flange, is tightly fitted in the insertion hole of the grommet between the outer portion of the terminal bolt and the grommet, such that the length from the bottom of the top flange to the lower end of the sleeve is less than the depth of the insertion hole of the grommet.

Abstract: An insulated blind rivet mounting arrangement in an aperture in a wall including a blind rivet having a tubular rivet member and a actuating rod that is disposed within the tubular member and is adapted for axial withdrawal therefrom; an insulating sheath made of non-electrically conductive material positioned over said tubular rivet member; and said blind rivet actuating rod being removable from said tubular rivet member for expanding the tubular rivet member and insulating sheath into tight interfitting relation with each other within the wall aperture. Alternative embodiments are disclosed in which one or more coaxially disposed tubular flanged members are utilized to complete the mounting, with the insulating sheath being effective to thermally and electrically insulate the tubular rivet member. The insulating sheath, which preferably is made of a resilient plastic material, also is effective for creating a substantially vibration-free mounting within the wall aperture.

Abstract: A connector is described which can be easily installed in a hole of a barrier wall, which assures tight sealing when there is a substantial pressure difference on opposite sides of the wall, and which avoids set of the sealing material. The connector includes a frame with a radially inner portion and with a skirt extending around the inner portion and slightly bendable radially outward and inward. O-rings are mounted on the outside of the skirt, so when pressure causes the skirt to expand, the O-rings form a tight fit against the surface of the hole, while when pressure is relieved the seals are pressed with less force and avoid becoming set. A group of thin limiters extend between the skirt and the inner frame portion. The limiters allow the skirt to expand radially outwardly, but limit radially inward deflection of the skirt to assure that even when there is no pressure the O-rings push firmly against the hole surface.

Abstract: A seal is provided around one or more supply lines, such as pipes, wires or cables, extending through an aperture in a bulkhead. A heat recoverable tubular article having a radially extending flange is recovered onto the supply line. A resilient annular member is held in sealing engagement against the face of the flange. Fittings are positioned over the recovered article to sealingly engage the assembly to the bulkhead aperture.

Abstract: An improved electrical bushing is disclosed which includes, in combination, an insulating body of a polyester material, a current-carrying stud, and an adhesive coating applied to the grooved peripheral surface of the stud. The bushing is manufactured by applying the adhesive coating to the peripheral surface of the stud. The polyester insulating body is then molded about the stud. Heast is applied to concurrently cure the polyester body and adhesive coating to achieve a bonded, fluid-tight seal between the stud and the insulating body.

Abstract: A wall duct assembly for a high pressure storage vessel, such as the carbonator tank of a beverage dispenser, includes a cylindrical ring formed in a wall area of the vessel having an inner surface defining an opening in the vessel, a wall duct bushing in the opening having a flange for sealingly engaging the interior wall of the vessel around the opening, an annular groove in the bushing opening towards the inner surface of the cylindrical ring and a sealing gasket in the groove. The wall duct bushing also has an annular bore through which electrical lines or other conduits may pass to the interior of the vessel.

Abstract: A hermetically sealed connector for a glove box and a method for exchanging such connectors in which leakage of radioactive material from within the glove box is minimized and an auxiliary glove box is not needed to exchange the connectors. The connector is formed as a cylindrical member having a flange portion hermetically sealed to a packing provided in a through hole in the wall of the glove box. To exchange connectors, a nut is removed from the outer end of the old connector and a tube is screwed thereto. The other end of the tube is fitted to the inner end of the new connector. The tube is then shoved through the packing until the flange of the new connector aligns with the packing. The tube is then removed from the inner end of the new connector and a nut is screwed on in replacement for the tube.

Abstract: A heat treating furnace in which an electrical resistance heating element is disposed in a chamber and is energized by way of a power feed through conductor which extends slidably through the wall of the furnace. An insulating washer and a retaining washer may be installed on and removed from the inner end portion of the feed through conductor from inside the furnace without either removing the conductor from the furnace wall or disconnecting the conductor from the heating element. A power terminal block and inlet and outlet lines for cooling water are adapted to be quickly and easily disconnected from the outer end portion of the feed through conductor to permit the conductor to be easily pulled inwardly through the furnace wall for servicing.

Abstract: A hermetically sealed terminal having improved leakage resistance, the terminal comprising a support member having a base with at least one annular opening therein and a pair of concentric sleeves associated with the opening and projecting outwardly from one side of the base, with an elongated terminal pin extending centrally through the sleeves, the terminal pin being secured to the support member by a molded dielectric sealing member bonded to the terminal pin and to the opposite surfaces of the base, integral portions of the sealing member filling the innermost sleeve and the annular space between the two sleeves and being bonded to the inner and outer surfaces of the sleeves to effectively increase the area of interface between the sealing member and the support member so as to inhibit the formation of leakage paths from one side of the terminal to the other due to thermal expansion and contraction of the parts.

Abstract: A coaxial cable is fed through a wall without introducing electrical reflections or otherwise compromising the cable's electrical integrity. A cylindrically-shaped housing having a cavity is inserted through an opening in the wall and is locked in place while an o-ring seals the juncture. A curable adhesive compound fills the cavity and adhesively engages an exposed length of cable shielding and the inner wall of the cavity. After the compound cures, a watertight interconnection and penetration of the wall is formed without compromising the cable's electrical integrity.

Abstract: A feed-through insulating assembly for a conductor in a high-pressure electrostatic precipitator comprises a pair of grooved insulator rings which are urged against a flange and bear upon the latter through wire seals, the rings being coaxial and having their grooves opening in opposite directions. A pair of oppositely concave cup-shaped members have rims seated on the floors of the respective grooves via further seals and reach into the grooves while being pressed together by the conductor and a nut/spring retaining arrangement. The flange surrounds an opening in the wall of the electrostatic precipitator.

Abstract: Resistance heating coils, flattened longitudinally along two sides to have generally oval cross-sections, are embedded in situ in a lightweight ceramic fiber insulating body adjacent to and extending along beneath the surface of the insulating body. Electrical terminal elements extend from the heating coils through the insulating body, and axial movement of the leads is prevented by anchoring members welded thereto. In one embodiment, the coils are embedded in an insulating body having a thickness no greater than about twice the depth of the heating coils. The resulting compact heating unit is sufficiently thin to be mounted as a retrofit item on the interior walls of an existing furnace.

Abstract: An electrical feedthrough system for pressurized containers comprising a `T` shaped flexible member adapted to pass through an opening in a container and an epoxy used as a secondary seal and support. A conductor passes through the `T` shaped member which maintains a seal around the conductor. Electrical connections are made to terminals at either end of the conductor.

Abstract: First and second conductive flanges adjacent first and second ends of a hollow insulator column are biased together by a through-rod assembly such that the first and second flanges cooperate with the insulator column to form a substantially enclosed chamber. The through-rod assembly means includes three coaxial cylinders connecting the first conductive flange to the second conductive flange. The innermost cylinder is connected to the first conductive flange and extends internally into the enclosed chamber. An external shoulder extends from the distal end of the first cylinder and supports one end of a second cylinder. The remaining end of the second cylinder terminates at an internal flange extending from the distal end of a third cylinder which extends from the second conductive flange.

Abstract: A heating element terminal comprising a tubular conductor extending through the central bore of a two-piece insulating clamp member and an aligned aperture of the heating element frame clamped therebetween. The tubular conductor includes a flattened terminal plate at a first end projecting outwardly of the heating element and at the second opposite end includes a compression sleeve portion extending axially therefrom and projecting inwardly of the heating element. An end of the resistance wire of the heating coil is inserted into the central bore of the inwardly projecting compression sleeve portion which is crimped to secure the end of the resistance wire to the said second end of the terminal. The flattened plate formed at the first end of the terminal is drawn into abutment against the two-piece clamp member, and the second opposite end is similarly flattened at the point immediately adjacent the opposite side of the clamp member.

Abstract: The snap-in mounting means includes a garter spring retained in an annular groove provided near the outer end of a bushing which extends from a switch frame on a switch base of an electrical toggle switch assembly and pivotally supports a toggle lever for actuating switch contacts housed in the switch. The garter spring has a helical diameter and an outermost toroidal diameter which is larger than the diameter of the mounting hole in a support panel on which the switch assembly is to be mounted. The bushing groove has an upper portion for retaining the garter spring in its normally expanded state, a lower portion of sufficient radial depth to receive the garter spring, when squeezed radially inwardly to a compressed state of reduced toroidal diameter without reducing the helical diameter, wherein the garter spring/bushing subassembly can pass through the panel mounting hole, and a tapered inner wall extending between the upper and lower portions.

Abstract: A device for passing an electric current through a wall subjected to excess pressure on its inner side, and comprising: a sleeve received in an aperture in the wall, which sleeve is integrally formed at its inner end with a collar engaging the inner surface of the wall; an electrical conductor for passing said electric current, which conductor includes a shaft passing through the sleeve, a head on the inner end of said shaft, and an inclined, e.g.

Abstract: Electric feedthrough for use in gastight enclosures has a generally cylindrical, molded body with a molded housing head carrying screw-type electrical connections. An O-ring is situated between the head and a nut threaded to mate with the threads on the housing body so that the nut can be screwed up to form a hermetic seal in the barrier wall of an opening. The screw-type terminations are located at radial distances from the center of the body at least as great as the radius of the body passing through the barrier wall.

Abstract: A fluid, filled, resinous casting composition, having a viscosity below about 20,000 cp. at 100.degree. C, is made from liquid resin, resin curing agent, and as high as 85 weight percent of a glassy filler comprising about 50 to about 60 weight percent of SiO.sub.2, about 12 to about 22 weight percent of Al.sub.2 O.sub.3, about 5 to about 15 weight percent of B.sub.2 O.sub.3, about 4 to about 14 weight percent of MgO and about 2.5 to about 12.5 weight percent of CaO.

Abstract: A self-locking terminal assembly mountable on a base or plate. The terminal assembly includes an integral, one-piece terminal stud, an interior insulating member and an exterior insulating member. In an assembled state, the terminal stud, internal insulating member, external insulating member and mounting base interlock to substantially avoid rotation of the terminal assembly with respect to the base, under an applied torque.

Abstract: An insulating bushing assembly for use with electrical apparatus and adapted to be installed through an aperture in a wall thereof, characterized by an electrically insulating bushing extending through an aperture in the wall and sealed in place by an elastic gasket between the bushing and the wall on one side thereof, the bushing having an annular groove on the other side of the wall and a garter spring disposed in the groove and having a smaller portion thereof extending beyond the groove and in contact with the other side of the wall, whereby the elastic gasket is retained in fluid-tight compression between the bushing and the wall.

Abstract: A probe for use in a fluid level sensing system has an electrode and an insulating body located between the ends of the electrode. The insulating body is in the form of a hollow, tubular shell and includes electrode carrying parts ad resilient fluid container wall engaging parts. The electrode and container wall engaging parts are spaced along the longitudinal axis of the electrode so that, when the probe is mounted in its operative position in an opening in a fluid container, the container wall engaging parts resiliently engage the container wall parts which bound the opening, and the electrode is supported by the shell at a position within the container and spaced from the container wall.

Abstract: A face seal for an electrical feedthrough in a bulkhead subject to large ferential pressures comprising a metallic bolt routed through a hole in the bulkhead; an electrical conductor soldered to the head of the bolt on the high pressure side of the bulkhead; an epoxy-resin seal molded around and bonded to the protruding head of the bolt and having a conical undersurface mating with the bulkhead so that a thin ring forms the interface between the epoxy seal and the bulkhead; and, a nut screwed on to the threaded end of the bolt on the low pressure side of the bulkhead. The thin ring interface between the epoxy seal and the bulkhead deforms when the epoxy seal is subjected to external pressure so that the seal pressure is amplified.

Abstract: A bushing for leading an electrical connector through a wall or the like has an intermediate flange for attachment in the wall and two metallic end flanges on either side of the intermediate flange. Two hollow insulating bodies are clamped between the intermediate flange and the end flanges, and a bushing conductor runs the length of the bushing. The bushing conductor is movable in relation to the remainder of the bushing or at least in relation to one of the end flanges. A drawing member is connected between the end flanges and is composed of first and second elongated metallic bodies each of which is attached to the corresponding end flanges overlapping each other for a certain distance. A pressure transmitting member, which is formed of a material with a greater coefficient of thermal expansion than the first and second metallic bodies, forms a power transmitting connection between the free ends of the metallic bodies.