Floor pan form

Claim 1

A FORM PAN ARRANGEMENT USEFUL IN FABRICATION OF RIBBED CONCRETE FLOORS AND THE LIKE, WHICH COMPRISES A PAIR OF SPACED SUBSTANTIALLY PARALLEL JOIST BOTTOM MEMBERS, A PLURALITY OF SPACED U-SHAPED CHANNEL MEMBERS POSITIONED BETWEEN THE JOIST BOTTOMS WITH THE LEG PORTIONS OF THE U-SHAPED CHANNELS SECURED TO THE JOIST BOTTOMS, SAID U-SHAPED CHANNELS HAVING FLANGES EXTENDING FROM THE EDGE OF AT LEAST ONE OF THE CHANNEL WALLS TO FORM AN ANGULAR RECESS BETWEEN THE FLANGE SURFACE AND THE OUTSIDE WALL OF THE CHANNEL, A U-SHAPED PAN MEMBER OF GENERALLY UNIFORM CROSS SECTION WITH THE LONGITUDINALLY EXTENDING SIDE WALL PORTIONS THEREOF CONTACTING THE SPACED JOIST BOTTOMS, AND THE END PORTIONS THEREOF RESTING IN THE ANGULAR RECESSES OF THE U-SHAPED CHANNELS TO FORM A SUBSTANTIALLY CONTINUOUS PLANE BETWEEN THE EXTERIOR SURFACE OF THE PAN MEMBER AND THE EXTERIOR SURFACE OF THE U-SHAPED CHANNEL MEMBERS.