Container with automatic erecting corners

Claim 1

A BLANK OF CORRUGATED SHEET FIBER MATERIAL FOR USE IN FORMING A CONTAINER, SAID BLANK COMPRISING A BOTTOMFORMING FIRST PANEL, A PAIR OF SIDE-FORMING PANELS FOLDABLE CONNECTED TO OPPOSITE SIDES OF SAID FIRST PANELS, A PAIR OF END-FORMING PANELS FOLDABLY CONNECTED TO OPPOSITE SIDES OF SAID FIRST PANEL INTERMEDIATE SAID SIDE-FORMING PANELS, A CORNER-FORMING PANEL FOLDABLY INTERCONNECTING AN END OF ONE SIDE-FORMING PANEL TO AN END OF ONE END-FORMING PANEL, SAID CORNER-FORMING PANEL HAVING A FOLD LINE DIVIDING SAID CORNER-FORMING PANEL INTO A FIRST TRIANGULAR PANEL ADJACENT SAID END-FORMING PANEL AND A SECOND TRIANGUALR PANEL ADJACENT SAID SIDE-FORMING PANEL, A FLAP-FORMING PANEL CONNECTED BY A FOLD LINE TO AN EDGE OF SAID ONE END-FORMING PANEL AND ADAPTED TO FOLD OVER ONE SAID ONE END-FORMING PANEL AND OVER SAID CORNER-FORMING PANEL WHEN SAID CONTAINER IS SET UP, SAID FLAP-FORMING PANEL HAVING A TRIANGULAR SEGMENT FOLDABLE ABOUT A FOLD LINE HAVING ONE END DISPOSED ON AN EDGE OF SAID FLAP-FORMING PANEL NEAR SAID ONE END-FORMING PANEL, SAID FIRST TRIANGULAR PANEL HAVING A PROTUBERANCE ADAPTED TO SNAP UNDER SAID FLAP-FORMING PANEL WHEN THE SAME IS FOLDED ABOUT SAID FOLD LINE TO ASSUME A POSITION INTERMEDIATE SAID FLAP-FORMING PANEL AND SAID ONE END-FORMING PANEL, SAID ONE SIDEFORMING PANEL HAVING A SLIT DISPOSED NEAR THE FOLD LINE SEPARATING SAID SIDE-FORMING PANEL FROM SAID CORNERFORMING PANEL, THE FIBER MATERIAL OF SAID SIDE-FORMING PANEL LYING BETWEEN SAID SLIT AND FOLD LINE BEING CRUSHED TO FORM AN OFFSET PORTION OF SAID SIDE-FORMING PANEL DEFINED ON ONE SIDE BY SAID SLIT, SAID TRIANGULAR SEGMENT HAVING A PROJECTION ADAPTED TO SNAP BEHIND SAID SLIT INTO SAID OFFSET PORTION OF SAID SIDE-FORMING PANEL.