Patent ID: 7905696

Claim:
A fastener for joining a first metal plate member and a second metal plate member together, the fastener comprising: a screw member, said screw member comprising a head, an engagement portion formed on the periphery of said head, and a shank perpendicularly extended from a bottom side of said head and terminating in a connection portion for fastening to a screw hole of said second metal plate member; a barrel fixedly connected to the engagement portion of said screw member and spaced around said shank, said barrel comprising an accommodation chamber and interference means disposed inside said accommodation chamber, said interference means being stopped at a bottom side of said head of said screw member; a socket axially movably inserted into the accommodation chamber of said barrel around said shank of said screw member for fastening to a mounting through hole of said first metal plate member, said socket comprising a center opening extending through top and bottom sides thereof for the passing of said shank of said screw member, a tapered inside wall portion surrounding said center opening, an inside annular flange, and a tubular top coupling flange axially extended from the top side for forcing into friction engagement with the interference means of said barrel; a spring member sleeved onto said shank of said screw member and stopped between the head of said screw member and the inside annular flange of said socket; and a stop ring sleeved onto said shank of said screw member and stoppable between the inside annular flange of said socket and the connection portion of said screw member, said stop ring having an outer diameter thereof forced into friction engagement with said tapered inside wall portion of said socket.