Prefabricated sectional structure

Claim 1

IN A KNOCKDOWN CASE HAVING UPPER AND LOWER HORIZONTAL FRAME MEMBERS REMOVABLY CONNECTED TO AND SUPPORTED BY AT LEAST FOUR UPRIGHT CORNER POSTS TO FORM A UNITARY SUBSTANTIALLY RIGID STRUCTURE WHICH CAN BE COMPLETELY ASSEMBLED FROM THE EXTERIOR OF THE CASE, A JOINING SYSTEM BY WHICH THE HORIZONTAL MEMBERS HAVE EACH CORNER RIGIDLY AND REMOVABLY CONNECTED TO ITS ADJACENT SUPPORTING POST CHARACTERIZED BY EACH UPRIGHT POST COMPRISING AN ELONGATED BODY HAVING AN OUTWARDLY FACING FRONT FACE AND AN INWARDLY FACING LONGITUDINAL CHANNEL OF V-SHAPED CROSSSECTION, SAID BODY HAVING A PLURALITY OF MODULAR SPACED HOLES EXTENDING HORIZONTALLY AND CENTRALLY THROUGH THE BODY IN REGISTRATION WITH THE V-SHAPED CHANNEL WHICH HAS ITS VERTEX LOCATED ON THE LONGITUDINAL CENTRE LINE OF THE BODY AND HAVING ITS SIDES AT AN ANGLE OF ABOUT 45* TO SAID FRONT FACE AND ABOUT 90* TO EACH OTHER, A PLURALITY OF CORNER BLOCKS, EACH CORNER BLOCK HAVING AN EXTERIOR FACE DEFINED BY SIDE WALLS DISPOSED AT AN ANGLE OF SUBSTANTIALLY 90* TO EACH OTHER AND OPPOSITING SAID LONGITUDINAL CHANNEL WHEREBY SAID CORNER BLOCKS CONFORMABLY SEAT IN SAID VSHAPED CHANNEL, MEANS SECURING EACH CORNER BLOCK TO AN ASSOCIATED ONE OF SAID HORIZONTAL FRAME MEMBERS, EACH CORNER BLOCK HAVING A THREADED ORIFICE ARRANGED IN A PLANE