Patent ID: 8137022

Claim:
A coupling pin for fastening together multiple sections, said pin comprising: a carriage member; and a riding member, longitudinally slidable over said carriage member, said carriage member and said riding member being mutually inclined longitudinally, and together complimenting each other to form a uniform pin, wherein at least one of said carriage member and said riding member comprises: (i) a front support ring, adapted for positioning and securing said riding member to said carriage member; and (ii) a rear support ring, adapted for positioning and securing said riding member to said carriage member, and wherein said pin is configured to be inserted into an aperture through said sections, said pin is configured to be displaced into a load-bearing position by an external axial force applied at one end of said riding member, whereby said carriage member substantially overlaps said riding member, and said pin is configured to be displaced into an insertion/retraction position by an opposite external axial force applied at the other end of said riding member, whereby said carriage member is axially shifted with respect to said riding member.