Device for folding box blanks

Claim 1

APPARATUS FOR SETTING UP INTO BOX FORM A FLAT BLANK HAVING A RECTANGULAR BOTTOM PANEL TOGETHER WITH HINGED SIDE AND END PANELS, TUCK FLAPS WITH OUTWARDLY PROJECTING LOCKING EARS INTEGRAL WITH THE ENDS OF THE SIDE PANELS AND SLITS IN EACH END PANEL FOR RECEIVING THE ADJACENT EARS IN LOCKING ENGAGEMENT, COMPRISING A ONE PIECE DIE HAVING AN OPENING FORMED THEREIN GENERALLY CORRESPONDING TO THE DIMENSIONS OF SAID BOTTOM PANEL, SAID DIE BEING FORMED OF A PLY OF MOLDABLE LATERALLY RESILIENT PLASTIC MATERIAL OF SUBSTANTIALLY CONSTANT THICKNESS, SHOULDERS FORMED ABOUT SAID DIE OPENING FOR FOLDING SAID SIDE AND END PANELS AT GENERALLY RIGHT ANGLES TO SAID BOTTOM PANEL WHEN SAID BLANK IS FORCED FLATWISE THROUGH SAID OPENING AND FREELY EXTENDING FLEXIBLE SIDE WALLS DEPENDING FROM SAID SHOULDERS AND CURVING INWARDLY TO NORMALLY RESTRICT THE SIZE OF SAID OPENING FOR YIELDINGLY ENGAGING SAID SIDE PANELS.