Abstract: A ground pin construction for an electrical device having a housing and prongs for insertion into an electrical socket, the housing including a boss having a bore therein for guiding the ground pin between extended and retracted positions, a flexible member attached to the ground pin and movable by a button which protrudes through the housing, cam surfaces on the housing which cause the elongated flexible member to ride over them as the ground pin is being moved to an extended position, and interengaging shoulders between the flexible member and the housing for retaining the ground pin in an extended position after the flexible member rides over the cam structure, the flexible member being deflectable by depressing on the button so that the flexible member can be disengaged from the shoulder on the housing and the ground pin can be moved to a retracted position by pushing on the button.

Abstract: A tester system which is adapted to be plugged into the outlet receptacle of an electrical power circuit for testing for faults which would affect the capability of the circuit to provide rated output voltage at rated load, whether the output line voltage is within a selected voltage range, and whether the receptable has been properly wired to the high voltage or hot conductor, the low voltage or return conductor and to the earth grounding wire. The tester is enabled on occurrence of a plurality of alternate cycles of the AC power carried by the circuit to connect the line conductors across a measuring resistor of sufficiently low value to draw rated current from the line. An electronic switch, including an SCR, is triggered coincident with the zero crossing of the AC cycle so that a single half-cycle of current passes through the measurement resistor. The measurement resistor may be rated much lower than the rated power. A resistor rated at three watts may be suitable.

Abstract: A connector device for placement between a female electrical outlet and a male plug including a housing having a first end wall with a post thereon mounting a tubular member, a pair of combined elongated prongs and prong receptacles mounted on the tubular member, with the prongs extending through slots in the first end wall and the prong receptacles located within the housing, a second tubular member mounted on the first end wall for receiving a grounding pin, a second end wall mountable on the housing in opposition to the first end wall and having a post in alignment with the post on the first end wall for retaining the tubular member in position, prong-receiving slots in the second end wall in alignment with the prong receptacles, and alignment members on the second end wall for maintaining the alignment of the prong receptacles with the prong-receiving slots in the second end wall.