US Patent 7993164 Compact power adapter with interchangeable heads

A power adapter for extending power from an electrical power source to a electrical device. The power adapter includes an adapter body, including an exchange surface, having one or more sets of interior electrical contacts. The power adapter further includes an end section that is attachable and detachable from the body. The end section includes (i) a set of end section interior electrical contact elements that make contact with the at least one set of interior electrical contacts, and (ii) a plug connector, electrically connected to the set of end section interior electrical contacts, and adapted to mate with a corresponding electrical receptacle.