Blank of a foldable material such as cardboard and a tray erected therefrom

• US 3,927,823 A
• Filed: 09/05/1973
• Issued: 12/23/1975
• Est. Priority Date: 09/13/1972
• Status: Expired due to Term

• Current Assignee: Karl Rune Persson
• Original Assignee: Karl Rune Persson
• Inventors: Persson, Karl Rune
• Primary Examiner(s): Christian, Leonard D.
• Application Number:
  US05/394,443
• Time in Patent Office: 839 Days
• Field of Search: 229/30,31R,31FS,41B
• US Class Current: 229/171
• CPC Class Codes: B65D 5/2023 the folded-up portions being folded along non-rectilinear fold-lines
• CPC Class Codes: B65D 5/2038 at least two opposed folded-up portions having a non-rectangular shape
• CPC Class Codes: B65D 5/248 and at least one side being extended and doubled-over to enclose the adjacent gusset flaps
• CPC Class Codes: Y10S 229/903 Ovenable, i.e. disclosed to be placed in an oven
• CPC Class Codes: Y10S 229/905 Frozen food
• CPC Class Codes: Y10S 229/93 Fold detail

Abstract

A blank of foldable material such as cardboard, aluminium foil or the like, which is divided by folding lines into areas for erecting a tray with a bottom, two opposite side walls with end flaps and two opposite end walls with folded down edge flaps which are adapted to lie over the folded in end flaps for the purpose of locking these. The folding line between the bottom and each of the end walls extends along an arc so that when folding up the end wall this wall and the folded down edge flap will be kept in a bent position, which locks the folded down edge flap.

Claims

1. A blank of foldable material for forming a folding tray comprising:

a bottom;

opposite sidewalls articulated along a fold line at one side thereof to said bottom;

an edge flange articulated along a fold line to another side of each sidewall and adapted to be folded to lie against an exterior surface of the associated sidewall;

opposite endwalls articulated at one end thereof to said bottom along an arcuate-shaped folding line;

an edge flap articulated to another end of each endwall along a substantially straight folding line;

locking means extended from and articulated along a fold line at opposite ends of each sidewall;

each sidewall and each endwall being adapted to be erected in a common direction relative to the bottom for assembly of the tray;

each edge flap being folded over to lie against an adjacent endwall, each locking means being folded to lie between an adjacent endwall and the associated folded-over edge flap, whereby the curved shape of the erected edge flaps and endwalls retain the enclosed locking means therebetween to maintain the respective endwalls and sidewalls in the erected condition.

2. A blank for forming a folded tray as set forth in claim 1, wherein each arcuate-shaped folding line causes each endwall to assume a concave contour along its exterior surface when erected.

3. A blank for forming a folded tray as set forth in claim 1, wherein each arcuate-shaped folding line causes each endwall to assume a convex contour along its exterior surface when erected.

4. A blank for forming a folding tray as set forth in claim 1, wherein said locking means comprises locking flaps extended from and articulated along a fold line at opposite ends of each sidewall edge flange and adapted to be folded to lie between each endwall and the associated folded-over edge flap to lock the sidewalls when the folding tray is in the assembled condition.

5. A blank for forming a folding tray as set forth in claim 4, wherein said locking means further comprises articulated corner gusset means for integrally and foldably connecting each sidewall to each endwall at the corners therebetween, said corner gusset means being adapted to lie flush against an associated endwall and beneath an associated edge flap when the folding tray is in the erected condition.

6. A blank for forming a folding tray as set forth in claim 1, wherein said locking means comprises end flaps extended from and articulated along a fold line at opposite ends of each sidewall and spaced from said endwalls;

said end flaps adapted to be folded to lie between each endwall and the associated folded-over edge flap to lock the sidewalls in the assembled condition.

7. A folding tray formed from a blank of foldable material comprising:

a bottom;

opposite sidewalls articulated along a folding line at one side thereof to said bottom;

an edge flange articulated along a folding line to another side of each sidewall;

locking flaps extending from and articulated to opposite ends of each edge flange along a fold line;

opposite endwalls articulated at one end thereof to said bottom along an arcuate-shaped folding line; and

edge flap articulated to another end of each endwall along a substantially straight folding line;

said edge flanges being adapted to be folded over to lie against an exterior surface of the associated sidewall with said locking flaps being adapted to be folded in towards one surface of the adjacent endwall, each edge flap being folded over to Assume a curved shape and to lie against the associated endwall with the adjacent locking flaps being positioned therebetween, whereby the respective curved edge flaps and locking portions lock the respective endwalls and sidewalls in an assembled condition.