Box flap locking system with sift-proof bottom

• US 7,789,292 B2
• Filed: 11/21/2006
• Issued: 09/07/2010
• Est. Priority Date: 11/21/2006
• Status: Active Grant

• Current Assignee: Norampac Schenectady, Inc. (Cascades Incorporated)
• Original Assignee: Norampac Schenectady, Inc. (Cascades Incorporated)
• Inventors: West, Thomas
• Primary Examiner(s): Elkins; Gary E
• Application Number:
  US11/562,056
• Publication Number:
  US 20080116249A1
• Time in Patent Office: 1,386 Days
• Field of Search: 229/109, 229/133, 229/138, 229/143, 229/144, 229/163, 206/45.29
• US Class Current: 229/109
• CPC Class Codes: B65D 5/0263 with end closures formed by inward folding of flaps, three of them being formed of a continuous strip, the fourth being a separate flap
• CPC Class Codes: B65D 5/029 the tubular body presenting a special shape pyramidal B65D5/008
• CPC Class Codes: B65D 5/103 one of the self-locking flaps having a tongue engaging into an opening of an opposite flap

Abstract

An octagonal shaped foldable box having a flap locking system. The foldable box includes: eight sidewall sections; a pair of opposing locking flaps extending from two of the eight sidewall sections, each opposing locking flap having a generally trapezoidal shaped tab cut therein for locking a first opposed locking flap with a second opposed locking flap; and a pair of opposing interior flaps, wherein each opposing interior flap extends from three of the eight sidewall sections, and wherein each opposing interior flap includes a first and a second flap edge, and each flap edge includes a fold-over region for forming a sealed corner with two sidewall sections.

Claims

1. An octagonal shaped foldable box having a flap locking system, comprising:

eight sidewall sections;

a first locking flap and a second locking flap extending from two of the eight sidewall sections and opposed from each other, each of the first locking flap and the second locking flap having a generally trapezoidal shaped tab cut therein for locking the first locking flap with the second locking flap; and

a pair of opposing interior flaps, wherein each opposing interior flap extends from three of the eight sidewall sections, and wherein each opposing interior flap includes a first and a second flap edge, and each flap edge includes a fold-over region for forming a sealed corner with two of the eight sidewall sections.

2. The octagonal shaped foldable box of claim 1, wherein each fold-over region includes a fold line.

3. The octagonal shaped foldable box of claim 1, wherein each fold-over region bridges a sidewall section with a flap edge.

4. The octagonal shaped foldable box of claim 1, wherein each flap edge includes a notch.

5. The octagonal shaped foldable box of claim 1, wherein each opposing interior flap is L-shaped.

6. The octagonal shaped foldable box of claim 1, wherein the first locking flap includes tapered corners.

7. The octagonal shaped foldable box of claim 6, wherein the first locking flap includes diagonal fold lines that project outwardly from the generally trapezoidal shaped tab.

8. A foldable box having sealed corners, comprising:

eight sidewall sections;

a pair of opposing exterior locking flaps extending from a first pair of the eight sidewall sections, each opposing exterior locking flap having a locking mechanism cut therein for locking the pair of opposing exterior locking flaps together wherein one of the pair of opposing exterior locking flaps includes diagonal fold lines that project outwardly from a generally trapezoidal shaped tab that forms the locking mechanism; and

a pair of opposing interior flaps, wherein each opposing interior flap extends from three of the eight sidewall sections, and wherein each opposing interior flap includes a first and a second flap edge, and each flap edge includes a fold-over region for forming a sealed corner with two of the eight sidewall sections.

9. The foldable box of claim 8, wherein each fold-over region includes a fold line.

10. The foldable box of claim 8, wherein each fold-over region bridges a sidewall section with a flap edge.

11. The foldable box of claim 8, wherein each flap edge includes a notch.

12. The foldable box of claim 8, wherein each opposing interior flap is L-shaped.

13. The foldable box of claim 8, wherein one of the pair of opposing exterior locking flaps includes tapered corners.

14. A multi-sided box, comprising:

a plurality of sidewalls;

a first flap that extends from at least two of the plurality of sidewalls, wherein the first flap includes a fold-over region that bridges an edge of the first flap with one of the at least two of the plurality of sidewalls to form a sealed corner where the first flap and the at least two of the plurality of sidewalls meet;

a diagonal fold line that defines an edge of the fold-over region; and

a pair of opposing locking flaps extending from the plurality of sidewall sections, each opposing exterior locking flap having a generally trapezoidal shaped tab cut therein for locking the pair of opposing exterior locking flaps together.

15. The multi-sided box of claim 14, wherein the first flap extends from a set of three adjacent sidewalls of the plurality of sidewalls and includes two fold-over regions.

16. The multi-sided box of claim 15, further comprising a second flap that extends from a second set of three adjacent sidewalls of the plurality of sidewalls and includes two fold-over regions.

17. The multi-sided box of claim 16, further comprising a third and fourth flap that include locking tabs.

18. The multi-sided box of claim 17, wherein the first and second flaps reside on an interior of the multisided box and the third and fourth flap reside on an exterior of the multi-sided box.

19. The multi-sided box of claim 18, wherein the third flap includes tapered corners.