Patent ID: 7497740

Claim:
A tandem-connected rotatable receptacle unit, comprising: a) a primary receptacle having a housing, an electric plug with an electric cord being disposed at a front end of the housing for obtaining power to enable the function of the primary receptacle, a first slot set being formed at a rear side of the primary receptacle for the output of power; and b) at least one tandem connection receptacle, the tandem connection receptacles each having a blade set at a front side of a housing for an electric plug-in connection to the first slot set of the primary receptacle, the blade set being fixed within a round seat, such that an internal end thereof is disposed within the housing, the blades of the blade set each being coupled to a conducting wire, the conducting wires each being electrically coupled to a conducting piece of a first slot set at a rear end of the tandem connection receptacles, the tandem connection receptacle further having a second slot set at a side wall perpendicular to the first slot set, a projecting rib being provided at a circumference of the round seat and fitting into an annular groove at the corresponding place of the housing, whereby the round seat is reversibly rotatable for adjusting the second slot set at the side wall of the housing in orientation; wherein the tandem connection receptacle further includes a transverse locking pin provided within the first slot set, and wherein one end of the transverse locking pin projects from one side wall of the housing to create a push-button portion, and wherein another end is disposed within the housing and a spring is mounted on the end of the transverse locking pin, and wherein the transverse locking pin includes two n-shaped indentations corresponding to the blade set, and wherein an engaging groove is formed at a top end and a bottom end of the blade set corresponding to the transverse locking pin, and wherein, when the tandem-connected blade sets are inserted into the first slot sets, the two n-shaped indentations are located beside the blade set due to the influence of the resilience of the spring in such a way that the transverse locking pins are engaged into the engaging grooves of the blade sets so that the tandem-connected receptacles are locked to one another.