Internal sleeve in a double-lamp socket

An internal sleeve in a double-lamp socket comprising:

• a tubular socket having an upper opening, a lower opening, a through hole in a middle periphery communicating to a longitudinal slot in upper periphery, a pair of hooks each facing a block plate symmetrically formed on lower opposing outer peripheries so as to define a pair of gaps therebetween, an elongate inlaid groove and a first short inlaid groove symmetrically formed in upper opposing inner peripheries and a second short inlaid groove in a lower inner periphery under said first short inlaid groove;
• a common contact plate disposed in said elongate inlaid groove of said socket;
• an internal sleeve disposed in said first short inlaid groove and having a concave in a guide groove and a pair of lateral sides stopped against a pair of lateral walls of said first short inlaid groove;
• a first electric wire inserted into said internal sleeve via said through hole and having a first contact plate inlaid into said concave of said internal sleeve;
• a second electric wire inserted into said socket via said through hole and having a second contact plate inlaid into said second short inlaid groove;
• a first lamp inserted into the upper opening of said socket and having an inverse L-shaped stop plate on one side of a base engaged within said longitudinal slot, a first bulb on top and a pair of lead-in wires attached to lateral side of said base respectively engaged with said common contact plate and said first contact plate;
• a second lamp inserted into the lower opening of said socket and having a pair of L-shaped stop plates symmetrically formed on opposing outer peripheries of a base respectively engaged within said gaps, a second bulb on lower end and a pair of lead-in wires attached to lateral sides of said base respectively engaged with said common contact plate and said second contact plate;
• whereby, a series circuit is therefore constituted inside said socket.