Patent ID: 6851961

Claim:
A power adapter for connecting an electric appliance to an AC main power, comprising: an electrical device having a power input/output end and an adjacent bottom, at least two metal prongs in the power input/output end and a plurality of knobs protruding from said bottom; and a connector comprising a body having a bottom and at least two recesses for sleeving said metal prongs respectively and electrically connecting said connector to said electrical device; a signal layer extending from said body and having a surface oriented so as be positioned under the bottom of the electrical device, and a plurality of pits sinking in said surface of said signal layer and positioned for receiving and holding said knobs, wherein there is a height difference between the bottom of said connector and said bottom of said electrical device, each of two surfaces of said body has a hollow region thereon for the convenience of assembling and disassembling said connector and said electrical device, and said knobs and said pits are used for fixing the position and preventing unfastening of said connector and said electrical device.