Panel interlocking means

Interlocking means for securing two end wall panels of a carton together in overlapping relation, said interlocking means comprising a locking tab joined to one of the panels along a first fold line and having an integral locking toe and an integral locking heel extending in opposite directions from said first fold line and generally transverse thereto, weakened fold line formed in said locking tab generally transverse to said first fold line, a locking aperture formed in the other panel and having a locking edge for engaging said locking heel upon insertion of said locking heel into said locking aperture in coordination with folding of said locking tab along said first fold line out of the plane of said one panel and relative movement of the panels toward each other, and said locking toe being of a size and configuration such that said locking toe is wider than the width of said aperture so that swinging movement of said locking tab causes at least one side edge portion of said locking toe to overlap a corresponding part of said other panel and so as to fold said locking tab along said weakened fold line, and a holding tab formed integrally with said other panel and disposed opposite said locking edge and having an arcuate end portion projecting inwardly into said locking aperture for engaging the outer surface of the extremity of said locking tab in flat face contacting relation thereby to aid in holding said locking tab in locked condition.