Quick-positioning screw assembly

A quick-positioning screw assembly comprised of a cap, a mounting socket fastened to a mounting through hole of a first plate member, a screw mounted in said cap for threading into a screw hole on a second plate member to secure said first plate member to said second plate member, elastic member mounted in said cap around said screw and stopped between said cap and said mounting socket, and a retaining device adapted to secure said top positioning flange of said mounting socket to said locating means of said cap, wherein:

• said cap comprises an inside annular flange extending around an inside wall thereof and a locating means disposed adjacent to said inside annular flange;
• said screw is press-fitted into said cap, comprising a threaded shank extending to the outside of said cap;
• said elastic member is sleeved onto said threaded shank of said screw, having a first end stopped at a bottom side of said inside annular flange of said cap and a second end opposite to said first end;
• said mounting socket is inserted into said cap to surround said threaded shank of said screw and said elastic member, the mounting socket comprising an inside annular flange that is stopped against said second end of said elastic member, a top positioning flange extending around the periphery thereof at a top side and engageable to said locating means of said cap, and a lower positioning flange extending the periphery thereof for positioning on a top wall of said first plate member around said mounting through hole of said first plate member;
• and
• wherein said retaining device is a C-shaped retaining ring.