Carton construction

Claim 1

A MOLDED PULP CARTON COMPRISING A CELLULAR TRAY HAVING A BOTTOM, FRONT, BACK, AND END WALLS DELIMITING AND EXTENDING UPWARDLY FROM SAID BOTTOM AND DEFINING AN OPEN UPPER SIDE, AND PARTITIONING MEANS DISPOSED WITHIN THE INTERIOR OF SAID TRAY AND COOPERATING WITH SAID WALLS AND BOTTOM TO FORM A PLURALITY OF ARTICLE-ACCOMMODATING POCKETS AND EFFECT RIGID INTERCONNECTION BETWEEN OPPOSED WALLS OF SAID TRAY; A COVER HINGEDLY CONNECTED TO THE UPPER EDGE OF SAID TRAY BACK WALL, SAID COVER, WHEN IN ONE POSITION OF HINGED ADJUSTMENT, OVERLYING, REGISTERING WITH, AND CLOSING THE TRAY OPEN UPPER SIDE, SAID COVER INCLUDING A TOP SURFACE DELIMITED BY FRONT, BACK, AND END WALLS WHICH DEPEND ANGULARLY OUTWARDLY FROM SAID TOP SURFACE, AN ELONGATED CONTINUOUS, RECTILINEAR, HOLLOW, INFLEXIBLE RIB DISPOSED INTERMEDIATE SAID COVER END WALLS AND DEPENDING FROM SAID COVER TOP SURFACE AN AMOUNT LESS THAN THE EXTENT TO WHICH SAID FRONT, BACK, AND END WALLS DEPEND THEREFROM, SAID RIB RIGIDLY INTERCONNECTING SAID COVER FRONT AND BACK WALLS AND RETAINING SAME IN A SUBSTANTIALLY FIXED RELATIVE POSITION, THE LONGITUDINAL AXIS OF SAID RIB BEING DISPOSED SUBSTANTIALLY NORMAL TO THE HINGE AXIS OF SAID COVER, THE ENDS OF SAID RIB BEING INTEGRAL WITH SAID COVER FRONT AND BACK WALLS, AND RIB REINFORCING MEANS DISPOSED WITHIN THE HOLLOW OF SAID RIB AND ANGULARLY POSITIONED WITH RESPECT TO THE RIB AXIS AND RIGIDLY INTERCONNECTING DEPENDING HOLLOW-FORMING PORTIONS OF SAID RIB, SAID COVER FRONT WALL HAVING A SUBSTANTIAL PORTION THEREOF DEPENDING FROM THE BOTTOM OF THE RIB INTEGRAL WITH SAID FRONT COVER, SAID COVER FRONT WALL BEING PROVIDED WITH AN APERTURE SPACED FROM THE END OF SAID RIB INTERGRAL WITH SAID FRONT WALL; AND A LATCHING FLAP HINGEDLY CONNECTED TO THE UPPER EDGE OF SAID TRAY FROM WALL AND BEING PROVIDED WITH PROTRUDING MEANS PROJECTING OUTWARDLY THROUGH SAID COVER FRONT WALL APERTURE TO EFFECT LOCKING OF SAID COVER IN SAID CLOSED POSITION.