Abstract: A rotary-plug wall lamp, which comprises a socket body having a seat hole to be mounted with a ring-shaped copper piece and a contact copper piece riveted in place; the outer ends of the two contact copper pieces are in contact with the power copper pins of the rotary disk respectively; the inner edge thereof is in contact with the contact points of the circuit board; the rotary disk and the socket body are connected electrically through a shaft contact point therein and a ring-shaped contact point so as to supply power for the wall lamp, which can be turned freely within an angle of 270 degrees.

Abstract: A swivel plug structure with a bulb socket, in which the bottom surface of the socket body has two symmetrical semi-circular slots; one end of each semi-circular slot has a through slot, while other end of the semi-circular slot has a stop flange. One end of the swivel base 14 has two copper plugs, while the other end thereof has two symmetrical hook members on the disk member thereof; the hook members are to be plugged through two through slots respectively in the socket body so as to have the swivel base and the socket body connected together. An outer cover has two symmetrical stop posts, of which the lower ends are set on the semi-circular slot nearing the through slots respectively; the stop post is used for stopping of, and limiting the turning angle of the hook member.

Abstract: A premold cap and core with its specific configuration saves labor and material in the making of heavy duty female connectors. The premold core and cap receive female receptacles that are crimped to lead cable. The premold then is cast into a female connector. The female receptacles are capped in place held in insets in the core. The cap is hollow and receives the core locking the female receptacles in place. The cap replaces the prior art fiber disk and presents polarized openings for polarized male pins with flag-like ends. The engaged male pins on a male connector are rotated so that the flag-like end are beneath the polarized openings and cannot be disengaged without rerotation of the connectors.