Stackable container with tapered stacking tabs

• US 6,581,772 B2
• Filed: 06/05/2001
• Issued: 06/24/2003
• Est. Priority Date: 06/05/2001
• Status: Active Grant

• Current Assignee: Packaging Corporation of America
• Original Assignee: Packaging Corporation of America
• Inventors: Noland, Carl M.
• Primary Examiner(s): Elkins, Gary E.
• Application Number:
  US09/874,809
• Publication Number:
  US 20020179481A1
• Time in Patent Office: 749 Days
• Field of Search: 229/174, 229/178, 229/915, 229/918, 229/919, 206/509, 206/511, 206/512, 414/802
• US Class Current: 206/509
• CPC Class Codes: B65D 5/0025 the corner posts being formed as a prolongation of a doubled-over extension of the side walls
• CPC Class Codes: Y10S 229/915 Stacking feature

Abstract

A container has a bottom panel, side walls, and end walls, with the bottom panel having recesses for accepting stacking tabs The side walls are provided with stacking tabs which are tapered inwardly so as to align with the recesses in the bottom panel of a second container. The inwardly tapered tabs allow for easy stacking without the tabs being deformed when containers are stacked atop one another. To improve strength, the side and end walls are disposed approximately at right angles to the bottom panel. Multiple plies of material are used along the container walls to increase container strength.

Claims

1. A container comprising:

a bottom panel having at least one bottom panel stacking tab receptacle cutout; and

first and second side walls, each of said first and second side walls containing at least one inwardly tapered stacking tab;

wherein said inwardly tapered stacking tabs each have outer tab portions and inner tab portions, lengths of said outer tab portions being greater than lengths of said inner tab portions.

2. The container of claim 1 wherein said lengths of said inner tab portions are from about 78% to about 82% of said lengths of said outer tab portions.

3. The container of claim 1 wherein each of said first and second side walls are provided with at least one side wall stacking tab receptacle cutout, said stacking tab receptacle cutouts aligning with said stacking tabs.

4. The container of claim 1 wherein said bottom panel has at least two stacking tab receptacles aligned with the stacking tabs.

5. The container of claim 1 wherein said inwardly tapered stacking tabs have outer tab portions having lengths of from about 10 mm to about 30 mm and inner tab portions having lengths of from about 9 mm to about 29 mm.

6. The container of claim 1 wherein said first and second side walls are disposed at an angle of about 90 degrees from said bottom panel.

7. A blank for forming a container, said blank being a single flat piece of corrugated paperboard cut and scored to provide:

a bottom panel;

two end wall major panels extending outwardly from said bottom panel;

first and second outer side wall panels extending outwardly from said bottom panel; and

first and second inner side wall panels respectively extending from said first and second outer side wall panels, each of said first and second inner side wall panels attached to said first and second outer side wall panels via two stacking tab assemblies, each of said stacking tab assemblies comprising an outer tab portion having an outer tab portion length and an inner tab portion having an inner tab portion length, said inner tab portion length being shorter than said outer tab portion length.

8. The blank of claim 7, further cut and scored to provide end wall minor panels extending from said outer side wall panels and said inner side wall panels.

9. The blank of claim 7 wherein a corrugation pattern of said paperboard runs in parallel with the direction from which the end wall major panels extend from the bottom panel.

10. The blank of claim 7 further comprising eight end wall minor panels attached to respective ones of said side wall panels, at least four of said end wall minor panels including minor panel cutaways to allow for folding around the access holes.

11. A method of forming a container, comprising:

providing a blank cut and scored to have;

a bottom panel;

two end wall major panels extending outwardly from said bottom panel;

first and second outer side wall panels extending outwardly from said bottom panel; and

first and second inner side wall panels respectively extending from said first and second outer side wall panels, each of said first and second inner side wall panels attached to said first and second outer side wall panels via at least one stacking tab assembly, the stacking tab assembly comprising an outer tab portion having an outer tab portion length and an inner tab portion having an inner tab portion length, said inner tab portion length being shorter than said outer tab portion length, said inner tab portion and said outer tab portion being separated by a tab crease;

folding said end wall major panels upwardly into positions approximately orthogonal to said bottom panel;

folding said outer side wall panels upwardly into positions approximately orthogonal to said bottom panel; and

folding said inner side wall panels inwardly into positions approximately parallel to said outer side wall panels along said tab creases so as to form inwardly tapered stacking tabs.

12. The method of claim 11 wherein each of said inner side wall panels is further provided with at least one forming tab and said bottom panel is cut to provide at least two forming tab receptacles aligned with said forming tabs, said method further comprising inserting said forming tabs into said forming tab receptacles.

13. The method of claim 11 wherein each of said side wall panels is provided with two minor end wall panels, said method further comprising folding said minor end wall panels into contact with corresponding ones of said orthogonal end wall major panels.

14. The method of claim 13 further comprising providing adhesive between said minor end wall panels and said end wall major panels.

15. The method of claim 11 further comprising providing adhesive between said outer side wall panels and said inner side wall panels.

16. A container comprising:

a bottom panel having at least two stacking tab receptacle cutouts;

first and second side walls, each of said first and second side walls comprised of an inner side wall panel and an outer side wall panel, each of said first and second side walls having at least one inwardly tapered stacking tab extending upwardly therefrom, each of said inner side wall panels having at least one stacking tab receptacle cutout; and

first and second end walls, said first end wall being supported by first and second inside first end wall minor panels and first and second outside first end wall minor panels, said second end wall being supported by first and second inside second end wall minor panels and first and second outside second end wall minor panels.

17. The container of claim 16 comprising corrugated paperboard wherein said first and second side walls are comprised of vertically corrugated fiberboard, said first and second side walls further being oriented at right angles to the bottom panel.

18. The container of claim 16 wherein said first and second side walls are further comprised of first and second rollover extension panels positioned between said inner side wall panels and said outer side wall panels.

19. A container comprising:

a bottom panel having at least two stacking tab receptacle cutouts;

first and second side walls extending at right angles upwardly from said bottom panel, each of said first and second side walls comprised of an inner side wall panel and an outer side wall panel, each of said first and second side walls having at least one inwardly tapered stacking tab extending upwardly therefrom, each of said inner side wall panels having at least one stacking tab receptacle cutout;

first and second end walls extending at right angles upwardly from said bottom panel, said first end wall being supported by first and second inside first end wall minor panels and first and second outside first end wall minor panels, said second end wall being supported by first and second inside second end wall minor panels and first and second outside second end wall minor panels; and

corner structures disposed at corners formed where said side walls and said end walls meet.

20. The container of claim 19 wherein said corner structures are comprised of corner structure panels extending from said inner side wall panels to said end wall minor panels.

21. A container comprising:

a bottom panel having at least one stacking tab receptacle cutout; and

first and second side walls, at least one of said first and second side walls containing at least one inwardly tapered stacking tab having an outer tab portion and an inner tab portion, a length of said outer tab portion being greater than a length of said inner tab portion.

22. The container of claim 21 wherein said length of said inner tab portion is from about 78% to about 82% of said length of said outer tap portion.

23. The container of claim 21 wherein at least one of said first and second side walls is provided with at least one side wall stacking tab receptacle cutout, said at least one side wall stacking tab receptacle cutout aligning with said at least one stacking tab.

24. The container of claim 21 wherein said inwardly tapered stacking tabs have outer tab portions having lengths of from about 10 mm about 30 mm and inner tab portions have lengths of from about 9 mm to about 29 mm.

25. The container of claim 21 wherein said first and second side walls are disposed at an angle of about 90 degrees from said bottom panel.