Safety plug with prong locks

Claim 1

An electrical plug for attachment to the end of an electrical power cord having at least two electrical wires therein, said plug comprising: (a) a body member having first and second ends; (b) a plurality of spaced-apart plug prongs carried by said body member and being slidably movable between (i) a retracted position in which said prongs are within said body member, and (ii) an extended position in which said prongs project forwardly from said first end of said body member; wherein said prongs are electrically connected to said electrical wires in said body member; wherein one of said prongs includes an aperture extending transversely therethrough; (c) an arm attached to said prongs for slidable movement relative to said body member for movement of said prongs between said retracted and extended positions; and (d) lock means for locking said prongs selectively in said retracted position and in said extended position; wherein said lock means comprises a pin which is movable between inward and outward positions; wherein when said prongs are in said retracted position and said pin is in said inward position, said pin extends into said aperture and prevents said prongs from moving to said extended position.