Electrical locking plug

Claim 1

A PLUG FOR A CONVENTIONAL SOCKET, SAID PLUG COMPRISING A BODY HAVING PRONGS, AT LEAST ONE OF SAID PRONGS HAVING A PAIR OF RESILIENT SIDES JOINED TOGETHER AND SPREADABLE WITH RESPECT TO EACH OTHER, ONE OF SAID SIDES BEING STRAIGHT AND THE OTHER SIDE HAVING FIRST AND SECOND STRAIGHT PORTIONS INTEGRALLY UNITED, THE FIRST PORTION BEING INTEGRALLY UNITED AT ITS END REMOTE FROM SAID PLUG WITH THE REMOTE END OF SAID OTHER SIDE AND FORMING AN ACUTE ANGLE THEREWITH THE SECOND PORTION EXTENDING TOWARD SAID PLUG SUBSTANTIALLY PARALLEL WITH SAID FIRST PORTION, AND A LOCKING DEVICE MOVABLE RELATIVE TO SAID BODY AND ENGAGEABLE BETWEEN SAID SIDES TO SPREAD SAID SIDES WHEN SAID PRONGS ARE INSERTED IN THE SOCKET, AN ELECTRICAL CORD HAVING CONDUCTORS DIRECTLY AND PERMANENTLY CONNECTED TO SAID PRONGS, SAID LOCKING DEVICE INCLUDING A STEM HAVING A POINTED END OF THE SAME SHAPE AS THE SHAPE BETWEEN SAID SIDES AND DISPOSED THEREBETWEEN, A PLUG MEMBER TO WHICH SAID STEM IS SECURED, SAID BODY HAVING A CAVITY ACCOMMODATING SAID PLUG MEMBER, AND SAID PLUG MEMBER BEING SLIDABLY DISPOSED IN SAID CAVITY.