Abstract: A method and apparatus for producing plastic parts with a resilient projection, such as connectors for corrugated tubing. The method comprises the steps of flowing plastic material on a core provided with a recess to mould the resilient projection, camming the resilient projection out of the recess, after the mass of plastic material is solidified and extracting the solidified part from the core. The invention also extends to a novel connector for corrugated tubing.

Abstract: An electrical cable connector seals an armoured electrical cable entering an explosion proof enclosure. The connector has less parts than existing connectors and takes less time to seal and assemble. The connector includes a rigid substantially tubular body portion with external threads at each end, the body portion has a passage therethrough for insulated conductors of an armoured electrical cable, an internal curved shoulder at one end of the body portion, and an internal taper at the other end of the body portion. A substantially tubular seal made from firm resilient elastomeric material passes over the armoured electrical cable, the seal has a substantially cylindrical inner surface, a frusto-conical outer surface extends from a small end, having a curved lip at the small end where the outer surface and the inner surface join, the curved lip is adapted to match the internal curved shoulder of the body portion.

Abstract: A universal support market for attachment to the back of an electrical box, supports the box in a hollow wall structure. The support bracket at the back of the box provides a more rigid mounting to support the box when an electrical plug is pushed into or pulled from an outlet. The bracket comprises an elongate strip of sheet material, one end of the strip having a first flange extending substantially perpendicular to the elongate strip, and having attachment means therein for connection to the back of an electrical box, and a second flange at the other end of the strip, substantially parallel to the first flange, extending freom the other side of the strip to rest on the inside surface of a wall board, and at least one scored bend line across the strip such that a portion of the strip may be bent in the same direction as the second flange, and substantially parallel thereto to accommodate a different depth of electrical box and a different depth of wall structure.

Abstract: An improved side plate for use in electrical boxes having locating fingers formed thereon at its ends outside its main body. The locating fingers are bent transversely from the plate about bend lines extending parallel to the front side of the plate.The invention is also directed toward an electrical box incorporating the side plates and a method of making the side plates.

Abstract: A connector for corrugated tubing, such as electrical conduit, provides easy installation and has superior resistance to pull out as well as high impact strength. The connector has a body with two slots on each side and a U-shaped locking element which snaps over the corrugated tubing. The locking element locks onto two portions of the circumference of the tubing, substantially symmetrically on both sides.

Abstract: A seal for a cable connector used to connect cables and the like to a partition or a housing provides that one size of seal can be used with a wider range of cable sizes than existing seals. The seal for the connector has a substantially tubular body made from elastomeric material. The body has a cylindrical inner surface, a frusto-conical outer surface extending from a small end with a curved lip at the small end. A large end at the other end of the tubular body and recesses formed in the tubular body between the inner surface and the outer surface, making the tubular body compressible.

Abstract: A cable connector for connecting cables and the like to a partition or housing, provides improved grounding and utilizes an elastomeric seal to prevent leaks. One size of connector can take a wider range of cable sizes than known connectors. The connector comprises a rigid tubular housing with external attachment means for attachment to an aperture in a partition, the housing having passage therethrough for a cable and a curved shoulder in the passage. A tubular seal having a cylindrical inner surface, a frusto-conical outer surface extending from a small end, a curved lip at the small end where the outer surface and the inner surface join, the curved lip adapted to sit against the curved shoulder in the passage, and a threaded cover to push the seal so that the curved lip of the seal is swivelled inwards and is adapted to contact the cable in the housing.

Abstract: A sheet metal, electrical wiring box having integral wiring device attachment means on its end walls. Each attachment means comprises a base plate bent outwardly from an end wall and flexible leg plates extending downwardly and inwardly toward each other from the ends of the base plate. Each leg plate ends in a partially threaded foot portion. The foot portions face each other and form an aperture through which a fastening screw, for the wiring device, can be pushed. The fastening screw is freely inserted down through an aperture in the base plate and pushed through the aperture between the foot portions on the leg plates when attaching the wiring device to the box. The flexible leg plates cause the partially threaded foot portions to bear against the screw. Rotation of the inserted screw draws the leg plates up tight against the base plate to securely lock the screw and the wiring device to the box.

Abstract: Connector means for use in connecting a corrugated conduit, of the type having longitudinally spaced-apart circular ribs on at least its outer surface, to an electrical box or other members. The connector means, in one embodiment, employs a tubular element on the box and the tubular element is provided with a slot. The conduit is axially inserted into the tubular element. A wedge is wedged in the slot so as to project into a groove between two adjacent ribs on the conduit to secure the conduit in the tubular element. In another embodiment, the connector means includes a wall in the box having a hole through which the conduit is passed. A wedge is inserted in the gap between the wall edge defining the hole, and the conduit, to lock the conduit in place.

Abstract: A connecting member for use in connecting a corrugated conduit to another member. The connecting member has a wall defining a cylinder with circular ends. At least one of the ends is a conduit entry end. A resilient finger is mounted by one end in an opening in the wall. The free end of the finger has a projection extending radially of the wall. The conduit is mounted in the connecting member and held there by the projection cooperating with a rib of the conduit.

Abstract: Formed metal electrical wiring boxes possess integral wiring device mounting members which permit the facile push-insertion of the wiring device mounting screws, but which firmly engage the mounting screws once tightened down. The mounting members comprise a flat portion attached to each endwall of the wiring box and formed at right angles to the endwalls. Opposed leg portions are attached to the flat portion, and are folded downwardly along the box endwalls. The leg portions terminate in opposed foot portions spaced apart from one another by a distance less than the diameter of the wiring device mounting screw. A mounting screw inserted through an aperture in the flat portion and between the opposed leg portions contacts the opposed foot portions forcing the leg portions apart to permit the push-insertion of the screw. Turning the mounting screw draws the opposed foot portions upward, forcing them against the screw threads to firmly engage the screw.

Abstract: An electrical wiring box arrangement particularly adapted for mounting on a metal support structure such as a U-shaped or I-shaped metal dry-wall stud includes an L-shaped mounting bracket with deformable leg portions and a wiring box. The wall structure of the box is provided with attachment tabs and the bracket with a number of correspondingly positioned tab-receiving openings which permit flush mounting of the wiring box arrangement with a variety of thicknesses of dry-wall panel.The legs of the mounting bracket are easily deformed by hand around the flanges of the metal stud permitting the mounting of the wiring box arrangement to either side of the stud and to metal studs of a variety of depths.

Abstract: Unitary folded metal electrical wiring boxes having the strength and rigidity of drawn one-piece boxes without the need for weld points comprise a flat polygonal base with sidewalls provided with mated extended portions and indented portions at the corners. Tabs on one sidewall extension fold over the top edge of the adjacent sidewall, engaging a notch on the second sidewall to interlock the sidewalls at each corner.