Panel interlocking means

Claim 1

A ARRANGEMENT FOR INTERLOCKING ADJACENT EDGES OF A PAIR OF SUBSTANTIALLY COPLANAR PANELS, SAID ARRANGEMENT COMPRISING A PLURALITY OF LOCKING TABS FORMED ALONG ONE EDGE OF ONE OF SAID PANELS AND DIPOSED IN OUTWARDLY PROTRUDING EXPOSED RELATION, EACH OF OF SAID TABS HAVING AT LEAST ONE GENERALLY TRANSVERSE LOCKING EDGE, THE PORTIONS OF SAID ONE EDGE OF SAID ONE PANEL WHICH ARE DISPOSED BETWEEN ADJACENT LOCKING TABS BEING OF ARCUATE INWARDLY PROTRUDING CONFIGURATION AND SAID TRANSVERSE LOCKING EDGES CONFORMING GENERALLY TO THE CONFIGURATION OF THE ADJACENT ARCUATE PORTIONS OF SAID ONE EDGE, A PLURALITY OF COMPLEMENTARYL LOCKING SLOTS FORMED IN THE OTHER OF SAID PANELS SAID LOCKING SLOTS BEING OF ARCUATE OUTWARDLY PROTRUDING CONFIGURATION TO DEFINE INDIVIDUAL GUIDE TABS AND THE END OF SAID SLOTS BEING DISPOSED IN DIVERGENT RELATION WITH RESPECT TO THE ASSOCIATED LOCKING EDGES RESPECTIVELY WHEREBY FASTENING SECURITY IS ENHANCED, A COMMON GUIDE PANEL FOLDABLY JOINED TO SAID OTHER PANEL ALONG A FOLD LINE WHICH IS DISPOSED IN GENERAL COINCIDENCE WITH SAID LOCKING SLOTS, AND A LONGITUDINAL FLEXING SLIT AT EACH END OF EACH OF SAID LOCKING SLOTS FOR FACILITATING BENDING MOVEMENT OF SAID GUIDE TABLS OUT OF THE PLANE OF SAID OTHER PANEL THEREBY TO FACILITATE INTERLOCKING ACTION OF SAID LOCKING TABS AND SLOTS, INTERLOCKING MOVEMENT BEIN IN A DIRECTION PARALLEL TO SAID FLEXING SLITS AT LEAST ONE INTERMEDIATE LOCKING TAB BEING PROVIDED WITH TRANSVERSE LOCKING EDGES ON OPPOSITE SIDES THEREOF AND THE END ONES OF SAID LOCKING TABS BEING PROVIDED WITH A TRANSVERSE LOCKING EDGE ON ONLY ONE SIDE THEREOF AND WITH A LONGITUDINAL POSITIONING EDGE ON THE OPPOSITE SIDE THEREOF WHEREBY SUBSTANTIAL TRANSVERSE RELATIVE MOVEMENT BETWEEN SAID PANELS IS PREVENTED.