Corner construction of stackable cardboard box

• US 4,799,620 A
• Filed: 12/04/1986
• Issued: 01/24/1989
• Est. Priority Date: 01/29/1986
• Status: Expired due to Term

• Current Assignee: Daniel Aguiló Panisello SA
• Original Assignee: Daniel Aguiló Panisello SA
• Inventors: Vilella, Antonio R.
• Primary Examiner(s): Marcus, Stephen
• Assistant Examiner(s): Elkins, Gary E.
• Application Number:
  US06/937,985
• Time in Patent Office: 782 Days
• Field of Search: 229/49, 229/191, 229/918, 229/DIG. 11, 206/509, 206/511, 206/512, 206/821
• US Class Current: 229/191
• CPC Class Codes: B65D 5/0065 Separate elements inserted in or attached to integral corner posts or ledges
• CPC Class Codes: Y10S 229/918 Corner construction

Abstract

A stackable cardboard box construction comprises a sheet of corrugated cardboard cut, grooved and folded to form a bottom panel, opposite side walls and opposite lengthwise walls united with the bottom by grooved fold lines. At each corner, the side walls and lengthwise walls have upwardly projecting tabs and are folded to form a hollow triangular column having double thickness walls and projecting up above the upper edges of the side walls and lengthwise walls. A triangular plastic cap fitting over the projecting upper end of each of the columns has a stop plane engaging the top of the respective column, a table spaced above the stop plane by reinforcing ribs and a frustoconical stud which projects up from the table and is received in an opening in the bottom of a next higher box in a stack to prevent side slipping.

Claims

1. A stackable cardboard box construction comprising a sheet of corrugated cardboard grooved and folded to form a bottom panel, opposite side walls and opposite lengthwise walls united with said bottom panel by grooved fold lines,

each of said side walls having at each end thereof an upwardly protruding tab and a flap separated from an upper edge of said side wall and joined with the respective tab by a grooved fold line for folding inwardly,

each of said lengthwise walls having at each end thereof an upwardly projecting tab of the same height as said tab of an adjoining side wall and first, second and third panels extending the respective tab, said first, second and third panels being joined with the respective tab and with one another by grooved fold lines for folding inwardly,

an end portion of each of said lengthwise walls including the respective tab forming one side of a column of right triangular cross section, said first panel being folded at right angles to said lengthwise wall to form a second side of said column, said second panel being folded at one hundred thirty five degrees to said first panel to form the hypotenuse of said column and said third panel being folded at one hundred thirty-five degrees to said second panel to underlie and reinforce an end portion of said lengthwise wall, an end portion of an adjoining side wall together with the respective tab overlying said first panel on said second side of said column and the respective flap being folded in at one hundred thirty five degrees to said end portion of said side wall to overly said second panel forming the hypotenuse of said column to form at each corner of said box a triangular hollow column having double walls on all sides and projecting up above said side walls and lengthwise walls,

a triangular plastic cap fitting over the upwardly projecting portion of each of said triangular columns, each of said caps having a stop plane engaging the upper end of the respective column, a table spaced above said stop plane, a plurality of reinforcing ribs resting on the upper end of said column and extending between said stop plane and said table and a frustoconical stud projecting up from said table,

said bottom panel having at each corner portion thereof an opening for reception of said studs of an under-disposed like box.

2. A stackable cardboard box construction according to claim 1, in which each of said caps on the inside of side walls thereof has triangular fastening teeth which engage in angular slots in upwardly protruding portions of the respective column to retain said cap on said column.

3. A stackable cardboard box construction according to claim 1, in which each of said caps has side walls embracing an upwardly projecting part of a respective column, said stop plane being at the level of upper edges of said side walls of said cap and said ribs extending up from said stop plane and supporting said table.

4. A stackable cardboard box construction according to claim 3, in which said table comprises a generally rectangular portion having two sides parallel to said hypotenuse of said column and two sides perpendicular to said hypotenuse and two wings projecting from said two last-mentioned sides.