Patent ID: 7121712

Claim:
A stepwise combined sockets for Christmas lights comprising: a pair of stepwise combined first and second sockets with the first socket positioned higher than second socket and having a vertical space formed along the connecting periphery through the upper rims of said sockets, a first inlaid groove formed in an inner periphery opposite to said vertical space for engaging with a single contact plate on top of a first electric wire, wherein said second socket has a second inlaid groove formed in an inner periphery opposite to said vertical space either, for engaging with a single contact plate on top of a second electric wire, a bent common contact plate striding bottom of said vertical space having an upper vertical portion disposed into said first socket, a transverse portion on the bottom of said vertical space and a lower vertical portion disposed into said second socket and engaged within a third inlaid groove in an inner periphery under said vertical space; a wrapper ring wrapped on the upper rim of said first socket having a downward projection on a side enabling to close said vertical space and a fourth inlaid groove in an inner side of said projection for engaging with the upper vertical portion of said common contact plate; a pair of lamps each having a base, a bulb in top of the base and a pair of lead-in wires attached on lateral sides of the base respectively engaged with a single contact plate and said bent common contact plate; whereby, an electric current circulation is therefore established inside said sockets to lighten said lamps.