Patent ID: 8371786

Claim:
A quick-positioning captive screw, comprising: a mounting base member for bonding to a mounting through hole of a first panel frame, said mounting base member comprising a cylindrical body defining an axial hole, a top flange extending around the periphery of said cylindrical body at a top side, a bottom flange extending around the periphery of said cylindrical body near a bottom end of said cylindrical body, and an inside step extending around an inside wall of said cylindrical body corresponding to said bottom flange, said top flange having a peripheral wall, a top edge located on a top side of said peripheral wall and a bottom edge located on a bottom side of said peripheral wall, and an outer thread spirally extending around said peripheral wall, said outer thread having a leading end terminating in the top edge of said peripheral wall of said top flange, a tail end terminating in the bottom edge of said peripheral wall of said top flange, and a series of thread turns connected between said leading end and said tail end and spirally extending around said peripheral wall of said top flange, said tail end cutting a part of said peripheral wall of said top flange into a rib between said tail end and said bottom edge; a lock screw coupled to said mounting base member for fastening to a mounting screw hole on a second panel frame to lock said first panel frame to said second panel frame, said lock screw comprising a screw bolt and a plastic cap, said screw bolt comprising a head and a threaded shank perpendicularly downwardly extended from a bottom wall of said head, said plastic cap being affixed to said head of said screw bolt and defining therein an accommodation space around an upper part of said threaded shank, an inner thread spirally extending around an inside wall near a bottom edge thereof and an inside stop edge disposed in said accommodation space near a bottom side and above the elevation of said inner thread; and a spring member sleeved onto said threaded shank of said screw bolt and stopped between said head of said screw bolt of said lock screw and said inside step of said cylindrical body of said mounting base member.