Ceiling panel structure

Claim 1

A FRAMEWORK OF THE CHARACTER REFERRED TO INCLUDING PAIRS OF ELONGATE, HORIZONTAL, PARALLEL, PRIMARY SECTIONS HAVING FLAT, VERTICAL, LONGITUDINAL WEBS, FLAT, HORIZONTAL, LATERALLY OUTWARDLY PROJECTING BASE FLANGES ALONG THE LOWER EDGES OF THE WEBS AND VERTICALLY SPACED DOWNWARDLY AND UPWARDLY OPENING CHANNELS EXTENDING LONGITUDINALLY ALONG THE OPPOSITE SIDES OF THE WEB, SAID CHANNELS BEING DEFINED BY THE WEB, UPPER AND LOWER LONGITUDINALLY FLANGES OF LIMITED VERTICAL EXTENT AND IN LATERAL SPACED RELATIONSHIP FROM THE WEB AND BY TIEING STRUCTURE BETWEEN THE WEB AND THE SAID UPPER AND LOWER FLANGES, SAID LOWER FLANGES HAVING A PLURALITY OF LONGITUDINALLY SPACED, LATERALLY AND UPWARDLY OPENING NOTCHES, SAID UPPER CHANNEL HAVING A STOP THEREIN, ABOVE EACH NOTCH IN THE LOWER FLANGE, A PLURALITY OF ELONGATE HORIZONTAL, LATERALLY SPACED, PARALLEL, SECONDARY SECTIONS ARRANGED AT RIGHT ANGLE TO AND EXTENDING BETWEEN RELATED PAIRS OF PRIMARY SECTIONS AND HAVING FLAT, VERTICAL, LONGITUDINALLY WEBS, FLAT, HORIZONTAL, LATERALLY OUTWARDLY PROJECTING BASE FLANGES AND VERTICALLY SPACED DOWNWARDLY AND UPWARDLY OPENING CHANNELS EXTENDING LONGITUDINALLY ALONG THE OPPOSITE SIDES OF THE WEB, SAID CHANNELS OPENING LONGITUDINALLY OUTWARDLY AT THE OPPOSITE ENS OF THE SECONDARY SECTIONS, AND COUPLER MEANS RELEASEABLY SECURING THE PRIMARY AND SECONDARY SECTIONS TOGETHER INCLUDING, AN ELONGATE COUPLER PLATE RELATED TO EACH END OF EACH SECONDARY SECTION, EACH COUPLER PLATE HAVING AN INNER SECTION SLIDABLY ENGAGED IN A PAIR OF RELATED UPPER AND LOWER CHANNELS AT THE OPEN ENDS THEREOF, AN OUTER PORTION PROJECTING LONGITUDINALLY OUTWARDLY FROM THE SECONDARY SECTION TO EXTEND ACROSS THE ADJACENT BASE FLANGE OF THE RELATED PRIMARY SECTION AND TO EXTEND THROUGH A RELATED NOTCH IN THE ADJACENT LOWER FLANGE OF THE PRIMARY SECTION, A LATERALLY AND UPWARDLY OPENING NOTCH IN THE TOP OF THE OUTER PORTION TO ACCOMMODATE THE ADJACENT UPPER FLANGE OF THE PRIMARY SECTION AND A FLAT VERTICALLY EXTENDING CLEAT ON THE OUTER EDGE OF THE OUTER PORTION WITH ITS LOWER END SEATED IN THE LOWER CHANNEL OF THE PRIMARY SECTION AND ITS UPPER END SEATED IN THE UPPER CHANNEL OF THE PRIMARY SECTION AND STOPPED AGAINST THE RELATED STOP IN THE UPPER CHANNEL.