Lock seam joint

Claim 1

A LOCK SEAM JOINT COMPRISING A PAIR OF ELONGATED SHEETS MECHANICALLY LOCKED TO A CLEAT, EACH SHEET HAVING AN ELONGATED EDGE HAVING A SUBSTANTIALLY CONTINUOUS RAISED PORTION EXTENDING IN PARALLEL SPACED RELATIONSHIP WITH RESPECT TO THE SHEET EDGE, SAID CLEAT BEING FORMED FROM AN ELONGATED SHEET OF RESILIENT MATERIAL INTO A GENERALLY FLAT BASE LEG PORTION, A FIRST PAIR OF INTERMEDIATE LEGS EXTENDING LATERALLY FROM SAID FLAT BASE LEG PORTION AND BEING ROLLED AND BENT BACK AND UNDER THE FLAT BASE LEG PORTION INTO GENERALLY PARALLEL RELATIONSHIP WITH RESPECT TO EACH OTHER WITH THE INNERMOST ENDS OF THE RESPECTIVE INTERMEDIATE LEGS BEING SPACED APART AND WITH THE RESPECTIVE INTERMEDIATE LEGS BEING DISPOSED IN PLANES GENERALLY PARALLEL TO THAT OF THE FLAT BASE LEG PORTION, A SECOND PAIR OF INTERMEDIATE LEGS EXTENDING IN OPPOSITE DIRECTIONS FROM THE INNER SPACED APART ENDS OF SAID FIRST PAIR OF INTERMEDIATE LEGS AND BEING ROLLED AND BENT BACK AND UNDER EACH OF THE RESPECTIVE INTERMEDIATE LEGS OF THE FIRST PAIR FORMING A CONNECTING U-SHAPED PORTION BETWEEN THE FIRST AND SECOND PAIRS OF INTERMEDIATE LEGS WITH THE OUTERMOST ENDS OF SAID SECOND PAIR OF INTERMEDIATE LEGS BEING DISPOSED IN CLOSER RELATIONSHIP TO THE FIRST PAIR OF INTERMEDIATE LEGS THAN THE SECOND PAIR OF INTERMEDIATE LEGS BEING GENERALLY OF THE SECOND PAIR OF INTERMEDIATE LEGS BEING GENERALLY ALIGNED WITH AND OVERLYING SAID FIRST PAIR OF INTERMEDIATE LEGS, ONE PAIR OF SAID INTERMEDIATE LEGS BEING PROVIDED WITH AN ELONGATED RAISED PORTION SPACED BETWEEN THE ENDS THEREOF AND IN SUBSTANTIALLY PARALLEL RELATIONSHIP WITH RESPECT TO THE RAISED PORTION OF THE OTHER LEG, THE RAISED PORTIONS OF THE INTERMEDIATE LEGS COMPLEMENTING THE ELONGATED RAISED PORTIONS ON SAID SHEETS, EACH INTERMEDIATE LEG RAISED PORTION COOPERATING WITH A RAISED PORTION ON ONE OF SAID SHEETS TO MECHANICALLY LOCK THE SHEET TO THE CLEAT, EACH PAIR OF INTERMEDIATE LEGS BEING URGED AWAY FROM EACH OTHER UPON INSERTION THEREIN OF SAID SHEET EDGES AND SAID RAISED SHEET PORTIONS AND ESTABLISHING THE RELEASABLE COMPRESSIVE MECHANICAL ENGAGEMENT OF SAID INTERMEDIATE LEG RAISED PORTIONS WITH SAID SHEET RAISED PORTIONS FOR FRICTIONALLY AND MECHANICALLY LOCKING THE SHEETS TO THE CLEAT.