Harvey Hubbell Incorporated

Hubbell Limited

Thomas E Lewis

Robert W Jorgensen

Richard D Swanson

Gregory J Kesler

A universal cable clamp for coupling a wide variety of electrical cables to an electrical box is capable of accepting metal or non-metallic sheathed cables. The cable clamp includes upper and lower clamping plates and a front wall having at least one opening for receiving the cable. The upper and lower clamping plates are coupled together by bendable coupling arms. A fastener extends through the upper and lower clamping plates and into the electrical box to deform the bendable coupling arms while the cable is clamped between the upper and lower clamping plates. The opening in the front wall in embodiments is oval-shaped and is dimensioned to allow a non-metallic sheathed cable to pass through, while preventing the metal sheath of a metal sheathed cable from passing through. The clamp provides a grounding connection of the metal cables and conduits. The cable clamp accommodates thick or thin steel and aluminum flex metal conduits, armored cable, metal clad cable and non-metallic cable.

Universal cable clamp having oval apertures

An electrical box assembly including an electrical box and a mounting bracket rigidly coupled to the box for mounting the box onto a support member, such as a stud or a joist. The mounting bracket includes a base portion and a pair of leg portions resiliently coupled to the base portion to form a substantially U-shaped, three-sided bracket. The mounting bracket has inwardly extending arms for resiliently gripping the support member. The arms of the mounting bracket grip onto either side of a metal or wood support member to secure the electrical box to the support member and prevent relative movement between the electrical box and the support member. In one embodiment, the arms include teeth to improve the grip between the mounting bracket and a wood support member. In another embodiment, the mounting bracket is coupled to the box by clamping tabs.

Electrical box assembly with mounting bracket

An electrical outlet box formed of nonmetallic material which has a pair of integral bosses that angularly align, engage and retain wiring device mounting screws therein. The bosses each have a through bore for receiving the screws comprising in sequence a frustoconical surface, a cylindrical surface having a diameter slightly larger than the crest diameter of the mounting screw threads, and a self-tapping surface defining a regular hexagon in transverse cross section. The hexagon has a diameter across its corners slightly larger than the crest diameter of the screw threads, and a diameter across its flat sides slightly larger than the root diameter of the screw threads and slightly smaller than the crest diameter of the screw threads.

Electrical outlet box with polygonal mounting bore

A knockout structure is provided for selectively forming openings for either one of two different sizes of conduit. The center of the inner knockout is offset from the center of the outer knockout, creating an eccentric relationship which permits a positive ground to be established between the smaller conduit and the box wall by a standard lock washer when the smaller conduit is mounted therein. A secure mechanical connection is similarly established.

Eccentric knockouts for metal boxes

A molded, thermoplastic outlet box is provided with openings near the back wall and clamp arrangements inside the openings. Each clamp arrangement includes a swingable clamp arm having teeth at the end thereof which cooperate with teeth formed on an inner wall of the box to engage a cable which has been inserted. An abutment prevents the clamp arm from swinging inwardly until a predetermined force has been exceeded. Flexibility of the arm is enhanced by parallel slots extending away from the opening on opposite sides of the clamp arm.

Growing community of inventors

South Bend, IN, United States of America

Thomas E Lewis