Support structure for engaging opening and closing units to track

A support structure for engaging opening and closing units to a track, wherein the support structure (1) comprises:

• a support main body (1') which is secured to the upper side or to both of the upper and the lower sides of each of a plurality of opening and closing units that move along a track laid in an opening and closing section (A) of a predetermined length and a storing section (B) contiguous with said section (A), and which has oblique slidable contact sides (3, 3) each formed in parallel with each other at respective ends of a horizontal plane thereof,
• parallel side engagement members (4, 4) each disposed along a longitudinal side of said support main body respectively for slidably engaging a plurality of adjacent support main bodies to each other when a plurality of main bodies are arranged in parallel with each other,
• a pulling engagement member (6) integrally secured along one of said oblique slidable contact sides (3, 3) of said support main body (1') and formed with an engaging groove (62) having an introduction port (63) adjacent to a blunt apex (3b) and a terminating end (61) adjacent to an acute apex (3a) of one of said oblique slidable contact sides (3, 3) and
• another pulling engagement member (7) integrally secured to the other of said oblique slidable contact sides (3, 3) of said support main body (1') at a position inside the blunt apex (3b), such that said another pulling engagement member (7) is engageable in the engaging groove (62) of said one pulling engagement member (6) of an adjacent support main body, when a plurality of support main bodies are arranged in series with each other.