Patent ID: 7210960

Claim:
An extension cord comprising: a plug; conducting wires electrically connecting with said plug; a plurality of sockets disposed at intervals along a longitude direction of said conducting wires; each said conducting wire electrically connecting with each said socket; said plug comprising terminals, an enclosure, a bottom and a cord buckle, which are sealed in an integral piece by welding for protecting its inner part from water and for safety; said socket comprising a face plate, a shell, and a cord buckle, which are sealed in an integral piece by welding for protecting its inner part from humidity and for safety; wherein the number of said conducting wires is two; wherein said socket comprises a plurality of caps, springs corresponding to through holes of said socket, and a mooring plate to hold said caps and said springs, said caps move back to seal the through holes under the pressures of said springs when said plug is pulled out from said socket, thereby said socket is safer for users and is easier for putting said plug into said socket; wherein a projecting portion is formed on one end of each said socket, a socket switch is provided on a face plate, a switch trip is sealed in said projecting portion under said socket switch by welding, said socket switch which contacts user's finger can contact said switch trip which connects electrical power in discontinuity, thereby safe structure and safe operation are achieved.