Abstract: An elongated casing of U-shaped cross section has a bearing block secured in its upper end. A U-shaped tubular arm has one leg rotatably supported through the bearing block and a female electrical socket on its other arm. Insulated conductors connected to the socket extend through the arm and downwardly through the casing. A spaced block secured in the casing below the pivoted end of the arm has a toggle bolt passed through the front of the casing and between the conductors and projects from the casing to engage a wall and support the casing. An insulating terminal block with conductor plates therein has two contact prongs projecting from the back of the casing at its lower end and two recessed contact holes in its upper face. The block is secured within the casing by bolts passing between the conductor plates.