Carton closure

Claim 1

A CARTON BLANK HAVING FOUR SERIALLY CONNECTED RECTANGULAR PANELS AND FOUR FLAPS AT ONE END OF THE BLANK WITH EACH FLAP BEING HINGED TO A PANEL ALONG THE ENTIRE LENGTH OF THE PANEL END, A FIRST GENERALLY RECTANGULAR FLAP JOINED TO A FIRST OF SAID RECTANGULAR PANELS, A SECOND GENERALLY RECTANGULAR FLAP JOINED TO A SECOND OF SAID RECTANGULAR PANELS SPACED FROM SAID FIRST PANEL BY A THIRD OF SAID PANELS, AND A THIRD FLAP JOINED TO SAID THIRD RECTANGULAR PANEL THROUGH A HINGE LINE, SAID SECOND FLAP CONTAINING TWO SLOTS, SAID THIRD FLAP HAVING A TAB AND KNEE AT A CUTAWAY PORTION BETWEEN THEM ADJACENT SAID SECOND FLAP AND A FOURTH FLAP JOINED TO THE FOURTH PANEL THROUGH A HINGE LINE AND BEING FORMED WITH A KNEE AND A TAB IN A MANNER CORRESPONDING TO SAID THIRD FLAP, SAID KNEES BEING FORMED SO AS TO PROVIDE A CLOSURE AT THE CORNERS OF THE ASSEMBLED CARTON AND SAID TABS BEING FORMED SO AS TO EXTEND THROUGH SAID SLOTS WHEN SAID THIRD AND FOURTH FLAPS ARE FIRST PARTLY FOLDED INWARDLY AND SAID SECOND FLAP IS FOLDED DOWN OVER SAID THIRD AND FOURTH FLAPS FORCING SAID THIRD AND FOURTH FLAPS INTO THE COMPLETELY CLOSED POSITION IN THE CLOSING OPERATION, SAID SLOTS BEING AT AN ANGLE TO THE HINGE LINE JOINING SAID SECOND FLAP TO SAID SECOND PANEL SUBSTANTIALLY AS DETERMINED BY THE LINES OF INTERSECTION BETWEEN THE PLANE OF THE SECOND FLAP AND THE PLANES OF THE THIRD AND FOURTH FLAPS (1) WHEN THEY ARE BENT PARTLY INWARDLY ON