Patent attributes
A structure includes: two abutted vertical bars having a rectangular tube shape; a plurality of hook hole groups on the side wall thereof; the side walls of the vertical bars are provided with first and second locking through holes, respectively, at the place adjacent to the butt-joining opening thereof; a hook hole group is arranged between one butt-joining opening and the first or second locking through hole; a bidirectional plug-in butt-joining member is assembled between the two butt-joining openings at the opposite ends of the two vertical bars, and the bidirectional plug-in butt-joining member further includes recess portions that are aligned with the hook hole groups arranged on the vertical bar adjacent to the butt-joining opening; and first and second positioning holes arranged on the side wall of the bidirectional plug-in butt-joining member and aligned with the respective locking through holes for locking through the respective locking member.
