Abstract: A detachable valve and slip joint structure is provided to permit removal of a basin pump. The structure includes an elbow joint attachable to the pump and having a lifting eye and a check valve to prevent backflow into the pump. The horizontal outlet from the elbow has a downwardly opening U-shaped flange and a pressure seal to engage a lip on a tubular outlet pipe which contains a 90.degree. plug or ball valve. The stem of the 90.degree. valve is attachable to a handle and carries a locking tab movable between stops. The tab engages the elbow when the 90.degree. valve is in its open position, preventing disengagement of the flange and lip slip joint until the valve is rotated to its closed position.

Abstract: A cable structure includes a plurality of insulated conductors, an exterior jacket and at least one support member within the jacket and between the insulated conductors. Each support member is made of a material which has good thermal conductivity and which is rigid to resist crushing of the cable and damage to the conductors or their insulation. Variously shaped support members are disclosed.

Abstract: A filter assembly for a luminaire for preventing contaminants and impurities from entering the sealed enclosure of the luminaire while permitting air to pass into and out of the sealed enclosure. The filter assembly includes a fitting and a cap. The fitting has an axially extending passageway opening at its opposite ends and a cavity receiving an air-permeable filter across the passageway. The cap has a first portion coupled to the fitting to cover one end of the fitting passageway, a second portion extending laterally from the first portion and a solid back member extending over the first and second portions. The first and second portions and the back member define a non-linear passageway in fluid communication with the fitting passageway to permit air to flow into and out of the luminaire sealed enclosure through the filter, while protecting the filter from the elements.

Abstract: A DC Solid State Overload Relay for use with a DC motor controller is provided with functions to provide instantaneous and delayed tripping of an overload relay by monitoring a standard ammeter shunt signal placed in the power line. The relay circuit uses dropping resistors and a sensing unit with the sensing unit containing separate presetable adjustment for the instantaneous and delayed tripping function and further has automatic reset provisions and a trip indicator which indicates the cause of relay tripping.

Abstract: A weatherproof housing and rotatable cover have radial lugs which are engaged when the cover is closed in a specific position and rotated clockwise. The cover is hingedly attached to the housing by a J-shaped arm and the cover has a skirt, one surface of which faces walls formed on the arm. The skirt has cam and stop surfaces defining a recess which engages a wall on the arm in the specific position, acting as a detent to inhibit rotational movement of the cover when it is open. Limited tilting movement of the cover is permitted by a sinuous spring in the mounting of the cover on the arm. A stop pin on the skirt prevents the cover from being rotated by 180.degree..

Abstract: A general purpose receptacle having selective single and split circuit electrical modes is adapted for mounting in a standard floor or wall mounting box. The receptacle is formed of a molded, one-piece receptacle body and a molded, one-piece receptacle front. Selection of single or split circuit operating modes is achievable by a break-off tab which normally electrically connects two sets of female contacts as a single circuit but which can be broken off so that the female contact sets are electrically separated. The receptacle is wired by placing the unstripped ends of insulated conductors at insulation severing terminals connected to the female contacts and forcing the conductors into the terminals. To accomplish this, a pair of suitably shaped side covers are hinged to the front part of the receptacle top to provide the requisite insulation-displacement forces.

Abstract: A grip for pulling cable, especially fragile cable such as fiber optic cable. The grip can pull such fragile cable with or without a fragile connector at the end thereof. The grip comprises a rigid, hollow protective sheath with an open tail end for receiving the cable end therein, a pulling device coupled at the lead end of the sheath, and a braided open wire mesh sleeve coupled at the tail end of the sheath for engaging the cable upon a longitudinal stretching thereof which radially reduces the sleeve around the cable. The pulling device can be a flexible wire loop rotatably coupled to the protective sheath. The open wire mesh sleeve can be closed along its length, split along its length or both closed and split in the two sections along its length.

Abstract: Disclosed is a ground conductor monitoring system which makes efficient use of an audio signal to continuously check the continuity of at least the ground conductor of a cable system.

Abstract: A wiring device with a pivotable and rotatable cover wherein the cover has a seal which is movable relative to the cover. The seal includes a resilient ring or disk carried by a stiff supporting disk loosely retained in the cover. When the cover is closed and rotated to tighten the cover on the device, the seal frictionally engages the mouth of the device and the cover rotates relative to the seal, avoiding damage to the seal.

Abstract: There is provided an insulated high voltage cable which possesses the property of lower dielectric losses than prior art cables. The cable comprises a conductor insulated with at least two laminar layers of insulating material. At least one of the layers is relatively thick and has a low SIC. At least one other of the layers has a high SIC and is in contact with a surface of the low SIC layer. The high SIC layer is relatively thin and has a tan .delta./SIC value no greater than 0.005 over a temperature range of 40.degree. to 90.degree. C.

Abstract: An open-mesh woven wire cable grip for fitting over an end portion of a cable with a larger diameter discontinuity therein comprises at its leading end a tubular portion of `closed` form and, woven integrally therewith, a shorter tail portion of `split` form which may be closed by lacing or rodding.

Abstract: A cover plate for completing the enclosure of an outlet box, the plate having a mounting screw retaining and aligning assembly integrally formed in an aperture in the plate. This assembly engages and aligns the screw so that the screw will not inadvertently fall out of the plate and the longitudinal axis of the screw is substantially perpendicular to the plate for ease of insertion of the screw into an internally threaded bore coupled to the box. The assembly comprises a pair of opposed, spaced flexible major webs integrally formed with the plate and extending into the aperture; and a pair of opposed, spaced flexible minor webs also integrally formed with the plate and the major webs and extending into the aperture. The major webs have parallel, straight distal edges which form chords of a circular aperture in the plate. The minor webs are in the form of ring segments. The assembly further comprises a countersink formed in the aperture and coaxial with that part of the aperture containing the webs.

Abstract: An assembly for absorbing energy between first and second bodies subject to relative movement comprising a cutting ring on one of the bodies dimensioned to cut into and remove a layer from a cylindrical member on the other body. The ring has an annular cutting edge with an inner diameter smaller than the outer diameter of the cylinder member. The two bodies can be, for example, two tubes forming a coupling device between two railroad cars. The outer surface of the cylindrical member can have longitudinal grooves to promote small chip formation during the cutting operation, thereby reducing the chance of jamming.

Abstract: An indicator light for a switch to show when a remote load is energized is provided for installations where no neutral wire is available at the switch box. A circuit including a gas discharge indicator lamp, a diode-resistor charging circuit and a capacitor across the lamp is connected between the load side of the switch and the grounding conductor in the switch housing. Current through the circuit is sufficiently small to create no hazard.

Abstract: A fire-rated feed-through fitting for transferring insulated wires through an opening formed in a concrete floor for connection to receptacles mounted on a compartmentalized head assembly, which includes a feed-through assembly disposed in the floor opening and non-rigidly coupled to the head assembly, and a retaining clamp for securing the fitting to the floor. The fitting includes a floor cup for storing excess slack wire, a conduit formed of at least one section, and at least one intumescent fire insulating barrier disposed between the floor cup and the conduit. The retaining clamp includes a collar portion slidably and rotably disposed on the feed-through conduit, and fastening screws for securing the collar portion to the conduit. Retractable arm portions are slidably mounted on the collar portion to enable utility of the fitting with floor openings of minimum size.

Abstract: An improved trolley system section insulator having a main support insulator, end support insulators attached to trolley wires and an intermediate runner member. The runner member is formed of two spaced conductive portions which are attached to the main support insulator by studs extending upwardly through the main support insulator, the studs being electrically connected together at their uppermost ends, thereby forming 90.degree. changes in direction of the current paths which exist when arcs are formed. The path changes produce magnetic fields which tend to blow the arcs downwardly, protecting the insulator portions from arc damage.

Abstract: A cable grip adapted to enclose a cable and comprising a split sleeve of open meshed structure with two series of loops along the two free longitudinal edges and a flexible locking member having a central loop and two legs extending from that loop for interconnecting the interfingered series of loops. The central loop is received in two adjacent loops at one end of the two longitudinal edges, and the legs extend through each of the remaining interfingered loops and are coupled together at the other end of these edges. To form the closure for the split sleeve, the sleeve is first wrapped around the cable so that the two series of loops are interfingered except for two adjacent loops at the top end, a rigid pin is maneuvered through all but the two top loops, the flexible locking member is maneuvered through these top loops and secured to the pin, and the pin is withdrawn, pulling the locking member with it through the remaining loops. Then, the locking member is released from the pin and is fastened in place.

Abstract: An industrial luminaire comprising a central housing formed of two identical parts, a capacitor cover pivotally coupled to one side of the housing having a capacitor therein, a ballast and ballast cover on the other side of the housing, a lamp socket coupled to the bottom of the housing, and a top cover pivotally coupled to the top of the housing. Separation of the capacitor and the ballast from the heat generating lamp provides longer life and higher efficiency for these components. The pivotal coupling of the top cover and the capacitor cover provide for easy access during maintenance. The top cover is coupled to a fixed overhead support over the center of gravity of the entire structure providing a balanced, reduced stress connection.

Abstract: A protective cover for an electrical connector capable of torsional flexibility and adapted for use in combination with an electrical connector having a rotatable sleeve for actuating a locking pin to lock the connector's blades. The cover is a unitary elastomeric body comprising a clamping assembly for securing to the connector cable, a gripping sleeve for engaging the rotatable sleeve on the connector, and a torsionally flexible portion joining the clamping assembly and gripping sleeve. The torsionally flexible portion includes an annular series of radial pleats and a thin-walled tubular portion extending from the pleats.

Abstract: A modular, branch circuit electrical power distribution system and components therefore, of the flexible wiring type. Lighting fixtures and devices are wired to connectors which employ contact assemblies comprising an integral combination of a male contact, a female contact, interconnecting bussbar and wire-securing means. This entire integral assembly is formed from a single piece of suitably cut and bent sheet metal stock. The integral male contact, female contact, bussbar, and wire-securing means contact assembly. This contact assembly permits power to be received from one cable set, transmitted to another cable set and tapped off to feed a fixture, receptacle, or other device. Cable sets have male connectors at one end and female connectors at the other end; other system components employ similarly corresponding sets of male and female contacts. Switches and receptacles are connected to couplers which may be fed by cable sets.