Building construction

Claim 1

BUILDING CONSTRUCTION COMPRISING INTERFITTING ELEMENTS EACH HAVING AT AN EDGE THEREOF A FIRST FLANGE AND AT THE OPPOSITE EDGE THEREOF A SECOND FLANGE EXTENDING IN THE SAME DIRECTION AS THE FIRST FLANGE WITH THE SECOND FLANGE HAVING A RECERSELY TURNED EXTREMITY FORMING A POCKET, THE POCKET OF AN ADJACENT ELEMENT RECEIVING THE FIRST FLANGE OF EACH OF THE INTERFITTING ELEMENTS, AND SUBGIRTS EACH HAVING ADJACENT AN END THEREOF A HOOK-SHAPED PROJECTION RECEIVING THE REVERSELY TURNED EXTREMITY OF THE SECOND FLANGE OF ONE OF THE INTERFITTING ELEMENTS AND HAVING ITS OPPOSITE END LYING BETWEEN THE FIRST MENTIONED END OF AN ADJACENT SUBGIRT AND THE INTERFITTING ELEMENTS AND HAVING AN ENDWISE EXTENSION AT SAID OPPOSITE END EXTENDING THROUGH AN OPENING IN SAID FIRST MENTIONED END OF SAID ADJACENT SUBGIRT, SAID EXTENSIONS HAVING AN OUTWARD PROJECTION EXTENDING TRANSVERSELY OF THE LENGTH OF THE SUBGIRT PASSING THROUGH AN OPENING IN THE BODY OF THE ADJACENT SUBGIRT, THE SURFACE OF SAID EXTENSION OPPOSED TO THE INTERFITTING ELEMENTS BEING CONVEXLY CURVED SO THAT THE SUBGIRT MAY BE APPLIED BY INSERTING THE EXTENSION UNDER THE FIRST MENTIONED END OF THE ADJACENT SUBGIRT WITH THE SUBGIRT DISPOSED AT AN ACUTE ANGLE TO THE GENERAL PLANE OF THE INTERFITTING ELEMENTS AND TURNING THE SUBGIRT DOWN INOT SUBSTANTIAL PARALLELISM WITH THE GENERAL PLANE OF THE INTERFITTING ELEMENTS, SAID CONVEXLY CURVED SURFACE OF THE EXTENSION SERVING AS CAM MEANS TO WEDGE THE SUBGIRT TIGHTLY BETWEEN THE FIRST MENTIONED END OF THE ADJACENT SUBGIRT AND THE INTERFITTING ELEMENTS.