Abstract: A safety device replaces the cover plate of a wall-mounted electrical outlet box having a pair of female receptacles for receiving a male plug. The safety device has a face plate, a back plate, a pair of shutters and a biasing means. The face plate has a front face and an opposing back face. The face plate has two large apertures in it, corresponding to the two female receptacles and exposing the receptacles when the face plate is positioned atop the outlet box and secured to it. The back plate has a inner surface and an outer surface and an aperture, which is shaped and positioned to correspond to the pair of female receptacles. When the front plate and back plate are mated, the front plate and the back plate are joined with the back face of the front plate, the inner surface of the back plate and a pair of parallel flanges on the back face defining a channel. First and second shutters, corresponding to each of the large apertures on the face plate, cover the apertures.

Abstract: A mechanical puzzle which relies on intermeshed gears which must be rotated into alignment, either relative to each other or static markings, or both. The gears rotate substantially unison unless a cut-out or slip-spot on any of the gears is so aligned with the shaft of an intermeshed gear such that the intermeshed gear can rotate freely.