Polygonal containers having a locking bottom and blanks and methods for forming the same

• US 9,242,758 B2
• Filed: 01/08/2015
• Issued: 01/26/2016
• Est. Priority Date: 02/19/2010
• Status: Active Grant

• Current Assignee: WestRock Shared Services, LLC (WestRock Company)
• Original Assignee: WestRock Shared Services, LLC (WestRock Company)
• Inventors: Brundage, David Joe, Smith, Kenneth Charles
• Primary Examiner(s): ELKINS, GARY E
• Application Number:
  US14/592,747
• Publication Number:
  US 20150115023A1
• Time in Patent Office: 383 Days
• Field of Search: 229/109, 229/155, 229/156, 229/157, 229/185, 493/162, 493/183
• US Class Current: 1/1
• CPC Class Codes: B31B 50/26 Folding sheets, blanks or webs
• CPC Class Codes: B31B 50/81 Forming or attaching accessories, e.g. opening devices, closures or tear strings
• CPC Class Codes: B65D 5/001 stackable
• CPC Class Codes: B65D 5/029 the tubular body presenting a special shape pyramidal B65D5/008
• CPC Class Codes: B65D 5/10 with end closures formed by inward-folding of self-locking flaps hinged to tubular body
• CPC Class Codes: B65D 5/103 one of the self-locking flaps having a tongue engaging into an opening of an opposite flap
• CPC Class Codes: B65D 5/4295 Ventilating arrangements, e.g. openings, space elements
• CPC Class Codes: B65D 5/6632 the lid-halves being held in closed position by flaps or tabs provided at their side edges only B65D5/6644, B65D5/6647 take precedence
• CPC Class Codes: Y10T 428/24008 including fastener for attaching to external surface

Abstract

A blank of sheet material for forming a polygonal container is provided. The blank includes two end panels, two side panels, and four corner panels connected in series along a plurality of fold lines. The blank further includes a plurality of bottom panels each extending from one panel of the end panels and the side panels. The plurality of bottom panels is configured to define a locking slot and a locking tab that is insertable into the locking slot to form a bottom wall of the container.

Claims

1. A blank of sheet material for forming a polygonal container, the blank comprising:

four side panels and four corner panels connected in series along a plurality of fold lines, each of the four corner panels having a free bottom edge;

a plurality of bottom panels each extending from one of the side panels, the plurality of bottom panels including a first bottom end panel, a second bottom end panel, and a second bottom side panel configured to define a locking slot, the plurality of bottom panels further configured to define a locking tab that is insertable into the locking slot to form a portion of the bottom wall of the erected container; and

a plurality of corner portions defined on each of the plurality of bottom panels, the plurality of corner portions configured such that at least one corner portion of the plurality of corner portions extends underneath each of the free bottom edges of the four corner panels when the container is erected.

2. A blank in accordance with claim 1, wherein each corner portion is at least partially defined by an outwardly extending portion of a free edge of a respective one of the bottom panels.

3. A blank in accordance with claim 1, wherein the plurality of corner portions comprises a pair of corner portions disposed on each bottom panel.

4. A blank in accordance with claim 3, wherein a first of the pair of corner portions is at least partially defined by a first outwardly extending portion, and a second of the pair of corner portions is at least partially defined by a second outwardly extending portion.

5. A blank in accordance with claim 1, wherein each at least one corner portion that is configured to extend underneath one of the free bottom edges is at least partially defined by an outwardly extending portion of a free edge of a respective one of the bottom panels and an inwardly extending portion of the free edge of the respective bottom panel.

6. A blank in accordance with claim 1, wherein a first bottom side panel of the plurality of bottom panels defines the locking tab.

7. A blank in accordance with claim 1, wherein the first bottom end panel defines a first locking extension, the second bottom end panel defines a second locking extension, and the second bottom side panel defines a locking indentation, and wherein the first locking extension, the second locking extension, and the locking indentation are configured to define the locking slot.

8. A container formed from a blank of sheet material, the container comprising:

four side walls and four corner walls connected in series along a plurality of fold lines, each of the four corner walls having a free bottom edge;

a bottom wall formed from a plurality of bottom panels each emanating from one of the side walls, the plurality of bottom panels including a first bottom end panel, a second bottom end panel, and a second bottom side panel that cooperate to define a locking slot, the plurality of bottom panels further defines a locking tab inserted into the locking slot to form a portion of the bottom wall; and

a plurality of corner portions defined on each of the plurality of bottom panels, at least one corner portion of the plurality of corner portions extends underneath each of the free bottom edges of the four corner walls.

9. A container in accordance with claim 8, wherein each corner portion is at least partially defined by an outwardly extending portion of a free edge of a respective one of the bottom panels.

10. A container in accordance with claim 8, wherein the plurality of corner portions comprises a pair of corner portions disposed on each bottom panel.

11. A container in accordance with claim 10, wherein a first of the pair of corner portions is at least partially defined by a first outwardly extending portion, and a second of the pair of corner portions is at least partially defined by a second outwardly extending portion.

12. A container in accordance with claim 8, wherein each at least one corner portion that extends underneath one of the free bottom edges is at least partially defined by an outwardly extending portion of a free edge of a respective one of the bottom panels and an inwardly extending portion of the free edge of the respective bottom panel.

13. A container in accordance with claim 8, wherein a first bottom side panel of the plurality of bottom panels defines the locking tab.

14. A container in accordance with claim 8, wherein the first bottom end panel defines a first locking extension, the second bottom end panel defines a second locking extension, and the second bottom side panel defines a locking indentation, and wherein the first locking extension, the second locking extension, and the locking indentation define the locking slot.

15. A method for forming a container from a blank of sheet material, the method comprising:

rotating a plurality of wall panels of the blank about a plurality of fold lines to form four side walls and a plurality of corner walls, wherein each of the plurality of corner walls has a free bottom edge, and wherein a plurality of bottom panels of the blank each extends from one of the wall panels, a plurality of corner portions is defined on each of the plurality of bottom panels;

rotating the plurality of bottom panels with respect to the plurality of wall panels such that at least one corner portion of the plurality of corner portions extends underneath each of the free bottom edges of the plurality of corner walls, and such that a first bottom end panel, a second bottom end panel, and a second bottom side panel of the plurality of bottom panels cooperate to define a locking slot, wherein the plurality of bottom panels further defines a locking tab; and

inserting the locking tab into the locking slot to form a bottom wall.

16. A method in accordance with claim 15, wherein rotating the plurality of bottom panels with respect to the plurality of wall panels further comprises rotating a first bottom side panel with respect to a first side wall of the four side walls to position the locking tab for insertion.

17. A method in accordance with claim 15, wherein the first bottom end panel defines a first locking extension, the second bottom end panel defines a second locking extension, and the second bottom side panel defines a locking indentation, and wherein rotating the plurality of bottom panels further comprises positioning the first locking extension, the second locking extension, and the locking indentation to define the locking slot.