Safety plug with ground lock and prong locks

Claim 1

An electrical plug for attachment to the end of an electrical power cord having electrical wires and a ground wire therein, said plug comprising: (a) a body member having first and second ends; (b) spaced-apart first and second plug prongs carried by said body member and being slidably movable between (i) a retracted position in which said plug prongs are within said body member, and (ii) an extended position in which said plug prongs project forwardly from said first end of said body member; wherein said plug prongs are electrically connected to said electrical wires in said body member; (c) a ground prong carried by said body member and projecting forwardly from said first end of said body member; wherein said ground prong includes an interior cavity and an aperture which communicates with said cavity; wherein said ground prong further includes a lock spring in said cavity which includes a raised portion which projects outwardly through said aperture and which is normally deflectable into said cavity; (d) an arm attached to said plug prongs for slidable movement relative to said body member for movement of said plug prongs between said retracted and extended positions; (e) lock means for locking said plug prongs selectively in said retracted position and in said extended position; and (f) an elongated locking bar carried by said arm; said locking bar being movable between (1) a first position in which it is slidably received in said cavity in said ground prong for preventing said raised portion of said lock spring from being deflected into said cavity, and (2) a second position in which said locking bar is retracted from said cavity.