Image Number 2 for United States Patent #4107766.
The invention is directed to an emergency power failure light of a multi-piece assembled housing with a safety interlock and using a bottom cup-shaped member to support electrical components with the member having protruding male prongs out the back for plugging into an AC outlet. A mid-cover is sized to nest and completely cover in the bottom member. It is open at the top and has a bottom wall to cover the electrical components, the wall also being apertured for a bulb socket with an electrical contact at the bottom. A curved reflector is mounted over the bulb in the mid cover and is carried by a lens coverplate that latches over the reflector to completely cover the mid cover and the lens and notches into the mid cover with the coverplate having a threaded socket extending through the mid cover into the assembly. A single bolt means recesses in the back of the bottom member and secures the assembly together requiring it to be removed from the AC outlet, whether an extension cord or wall outlet, before the bolt can be detached for bulb changing.