Abstract:
An octagonal container closure in which the bottom closure flaps are held in place. Locking slots are placed in opposed side closure flaps. The slots are shaped and located to allow the corner closure flaps to extend through the slots and to lock behind the side closure flaps.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     A tubular container with a closure means. 
     2. Other Patents in the Field 
     Dempster U.S. Pat. No. 4,119,266 granted Oct. 10, 1978 disclosed an octagonal tubular container with a closing means. In this container, the side closure flaps have aligned slots through which the end closure flaps extend. The corner closure flaps are within the container. 
     SUMMARY OF THE INVENTION 
     A typical octagonal bulk bin is 47 inches long, 39 inches wide and 40 inches deep. It is used for packing fresh meat and will hold between 1500 and 2300 pounds of meat. Although the container is normally carried on a pallet, it is still necessary to hold the bottom closure flaps in place during transportation and storage. 
     The purpose of the present octagonal container closure is to hold the bottom closure flaps in place while maintaining the structural integrity of the flaps by using locking slots in opposed side closure flaps which remove as little material as possible from the side closure flaps. The apertures are shaped and located to allow the corner closure flaps to extend through the apertures and to lock behind the side closure flaps. The shape of the apertures provides a lock on the sides of the corner closure flap. The end closure flaps extend into the container above the side and corner closure flaps. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a top plan view of the blank for the container. 
     FIG. 2 is an isometric view of the formed container. 
     FIGS. 3-5 are isometric views showing the container closure being formed. 
     FIG. 6 is a top plan view of the container closure. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Blank 10 is divided into a first partial end panel 11, a first corner panel 12, a first side panel 13, a second corner panel 14, a second end panel 15, a third corner panel 16, a second side panel 17, a fourth corner panel 18 and a second partial end panel 19 by transverse scorelines 20,21,22,23,24, 25,26 and 27. The corner panels are narrower than the side and end panels. A series of closure flaps are connected to these panels along longitudinal scoreline 28 which forms the lower edge of the panels and the hinge between the panels and closure flaps. The first partial end closure flap 30 is attached to the first partial end panel 11; the first corner closure flap 31 is attached to the first corner panel 12; the first side closure flap 22 is attached to the first side flap 13; the second corner closure flap 33 is attached to the second corner panel 14; the second end closure flap 34 is attached to the second end panel 15; the third corner closure flap 35 is attached to the third corner panel 16; the second side closure flap 36 is attached to the second side panel 17; the fourth corner closure flap 37 is attached to the fourth corner panel 18; and the second partial end closure flap 38 is attached to the second partial end panel 19. The panels and flaps are substantially rectangular. 
     The closure flaps are separated by slots which are aligned with the transverse scorelines. The slots 40, 41, 42, 43, 44, 45, 46 and 47 are aligned respectively, with socrelines 20,21,22,23,24,25,26, and 27. 
     In the completed tubular container 50, shown in FIG. 2, the first partial end panel 11 and the second partial end panel 19 are adhered along manufacturers&#39; joint 49 to form the first end panel 51 and the first partial end closure flap 30 and the second partial end closure flap 38 are adhered along manufacturers&#39; joint 49 to form the first end closure flap 52. 
     The side closure flaps 32 and 36 each have a pair of slots 53. The slots 53 are oriented diagonally in the flaps extending diagonally from the direction of the outer corner of the flap adjacent the slot. For example, slot 53a extends diagonally from the direction of the adjacent outer corner 54 of side closure flap 36. The preferred orientation of slots 53 is shown in solid line. Other possible orientations are shown in dotted line at 53b. This range of orientations is covered by the term diagonal orientation from the direction of the outer corner of the side closure flap adjacent the slot. 
     The location and alignment of the slots 53 in the side closure flap will allow the corner closure flaps to extend through the slots in the closed container and fit behind the side closure flap as shown in FIG. 6. The slot 53 may be entirely within the flap as shown or it may extend to the outer end or side edge of the flap. The intersection of its diagonal extension with the edge of the flaps need not be with the corner but may be with the side or outer end edge. Its exact location and direction will depend on the exact width and the width relationships of the side, corner and end panels. 
     In forming the container, the end closure flaps 52 and 34 are bent inwardly around score line 28 until they are aligned with the scoreline. The side closure flaps 32 and 36 are then bent inwardly around scoreline 28 until they are aligned with the scoreline. The corner closure flaps 31, 33, 35, and 37 are bent inwardly around scoreline and inserted through the slots 53. As can be seen in FIG. 6, the shape of the slots locks the corner closure flaps in position.