US3927823A - Blank of a foldable material such as cardboard and a tray erected therefrom - Google Patents

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

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US3927823A
US3927823A US394443A US39444373A US3927823A US 3927823 A US3927823 A US 3927823A US 394443 A US394443 A US 394443A US 39444373 A US39444373 A US 39444373A US 3927823 A US3927823 A US 3927823A
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Prior art keywords
folded
endwall
tray
along
articulated
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US394443A
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Karl Rune Persson
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Sprinter Pack AB
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Sprinter Pack AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/20—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form
    • B65D5/24—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form with adjacent sides interconnected by gusset folds
    • B65D5/248—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form with adjacent sides interconnected by gusset folds and at least one side being extended and doubled-over to enclose the adjacent gusset flaps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/20—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form
    • B65D5/2014—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form the central panel having a non rectangular shape
    • B65D5/2019—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form the central panel having a non rectangular shape with at least partially curved edges or the like
    • B65D5/2023—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form the central panel having a non rectangular shape with at least partially curved edges or the like the folded-up portions being folded along non-rectilinear fold-lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/20—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form
    • B65D5/2038—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form at least two opposed folded-up portions having a non-rectangular shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/902—Box for prepared or processed food
    • Y10S229/903—Ovenable, i.e. disclosed to be placed in an oven
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/902—Box for prepared or processed food
    • Y10S229/905—Frozen food
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/93—Fold detail

Definitions

  • 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.
  • FIG.1 A first figure.
  • the present invention relates to a blank of a foldable material such as cardboard, which is divided by means of folding lines into areas for raising a tray with a bottom, two opposite side walls with end flaps and two opposite end walls with edge flaps folded down and overlapping the end flaps folded in for locking these.
  • end flaps and edge flaps have normally been locked by the action of an additional agent such as an adhesive or by arranging slots in the end walls.
  • the object of the invention is to provide a blank which can be erected to a tray with the end flaps and edge flaps locked without the assistance of an adhesive or other additional means and without the need to arrange slots in any of the tray sections.
  • the blank may be provided with known surface coats to resist liquid, the coat consisting of heat sealable plastic, which may also be of a known type, to withstand temperatures of over 200C, as is the case when the tray is to be used, for example, for ready cooked food or other food intended for heating, such as baking powder mixtures which after adding liquid can be heated and baked into cakes or bread.
  • the tray according to the invention may also be used to advantage for ice-cream and other deep-frozen foods. It is also possible to use the materials according to the invention, which include cardboard, thin aluminium foil or similar materials, for domestic purposes where one can very easily erect the tray oneself and store food in the tray so that the tray can be placed directly into the oven for heating. After use the tray can be thrown away, thereby avoiding washing up conventional heating vessels.
  • An important advantage of the tray according to the invention is that it can easily be opened by simply folding up the edge flaps and then folding out the end walls and side walls of the tray to release the deep-frozen goods such as ice-cream or the prepared pastry.
  • FIG. 1 shows an embodiment of the blank for the formation of a tray with tight corners
  • FIGS. 2, 3 and 4 show in perspective various stages of the tray during erection thereof
  • FIG. 5 shows one end of the erected tray seen from the inside
  • FIG. 6 is a perspective view of the erected tray
  • FIG. 7 shows an end section of another embodiment of the blank according to the invention with freely projecting end flaps
  • FIG. 8 shows one end of a tray erected from the blank in FIG. 7 with the end flaps on the outside of the tray, the edge flaps being folded down towards these end flaps
  • FIG. 9 shows one end of a tray erected from the blank in FIG. 7 with the end flaps on the inside of the tray and the edge flap folded down over these end flaps.
  • the blank in FIG. 1 and the corresponding tray in FIGS. 2 to 6 consist of a bottom 10, two side walls 12, 14 and two end walls l6, 18.
  • the side walls are extended with end flaps 20, which in the example shown consist of corner sections between the ends of the end walls and the side walls and can be folded along edge folding lines 22, 24 and diagonal folding lines 26 in a manner known per se.
  • edge flaps 28 which can be folded along straight, or essentially straight, transverse folding lines 30.
  • the end wall 16 can be folded relative to the bottom 10 by folding along an arc-shaped folding line 32.
  • the side walls have edge flanges 34 which are extended by locking flaps 35.
  • end wall 16 When the end wall 16 is folded up, it will be forced into an are shaped position, as shown in FIGS. 2 and 3, due to the fact that folding line 32 has an arcuate shape. In this position the end flaps 20 are folded in towards the outside of end wall 16 and then the edge flap 28 is folded down over the end flaps as shown in FIG. 4.
  • edge flap 28 After folding down the edge flap 28 end wall 16 and the folded down edge flap 28 will be kept in the are shaped position as shown in FIGS. 5 and 6.
  • folding line 30 between edge flap 28 and end wall 16 will not normally bend out as much as folding line 32 between end wall 16 and bottom 10, but by providing bottom folding line 32 with a sufficient arc shape, sufficient bending of the edge flap folding line 30 in the erected tray is also obtained so that the edge flap can be locked in its folded down position.
  • the tray shown in FIG. 6 has liquid tight corners. It can easily be opened by folding up the edge flaps. If the blank has a heat sealable coat, an extra locking action can easily be obtained by heat sealing, but this should not be necessary in most cases.
  • FIG. 7 shows a blank corresponding to the blank in FIG. 1 with the difference that end flaps 36, which can be folded along a folding line 38, are freely projecting from the ends of the side walls, and that the side walls have no edge flaps.
  • end flaps 36 can alternatively be placed on the outside of the end wall as shown in FIG. 8 which gives the tray a smooth inside, or end flaps 36 can be placed on the inside of the end wall as shown in FIG. 9, which gives the tray a smooth outside.
  • edge flap 28 is folded down towards the outside of the end wall, and in the second case it is folded down towards the inside of the end wall. In both cases locking of edge flap 28 is obtained in its folded down position due to the arc-shaped bottom fold 32.
  • bottom folding line 32 on the blank in FIGS. 1 and 7 is provided to form an are which is curved towards folding line 30 between edge flap 28 and end wall 16 so that the exterior surface of each end wall I6, 18 has a convex contour, but it is also possible to curve bottom folding line 32 in the opposite direction so that the exterior surface of each end wall 16, I8 has a concave contour and still obtain the locking action according to the invention.
  • a furtherimportant advantage of the blank according to the invention is that it can have a relatively small material thickness with minimal rigidity. This does not prevent the locking action according to the invention from. being obtained for the formation of a tray with satisfactory locking action at the corners for a large number of applications.
  • the tray walls form an essentially right angle with the bottom, but they may also incline outwards to enable the trays to be stacked on top of each other.
  • a blank of foldable material for forming a folding tray comprising:
  • 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.
  • each arcuate-shaped folding line causes each endwall to assume a concave contour along its'exterior surface when erected.
  • each arcuate-shaped folding line causes each endwall to assume a convex contour along its exterior surface when erected.
  • 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 arcuateshaped 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.

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.

Description

United States Patent 1191 Persson BLANK OF A FOLDABLE MATERIAL SUCH AS CARDBOARD AND A TRAY ERECTED THEREFROM [75] Inventor: Karl Rune Persson, Halmstad,
Sweden [73] Assignee: Sprinter Pack AB, l-lalmstad,
Sweden [22] Filed: Sept. 5, 1973 [21] Appl. No.: 394,443
[30] Foreign Application Priority Data Sept. 13, 1972 Sweden 11806/72 [52] US. Cl. 229/31 R; 229/41 B [51] Int. Cl. B65D 5/36 [58] Field of Search 229/30, 31 R, 31 FS, 41 B [56] References Cited UNITED STATES PATENTS 3,008,626 11/1961 Lawrence 229/31 FS Dec. 23, 1975 3,767,108 10/1973 Arneson 229/31 F5 FOREIGN PATENTS OR APPLICATIONS 860,744 1/1941 France 229/34 R Primary ExaminerLeonard D. Christian Attorney, Agent, or FirmOstrolenk, Faber, Gerb & Soffen [57] 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.
7 Claims, 9 Drawing Figures US. Patent Dec. 23, 1975 Sheet1of2 3,927,823
FIG.1
US. Patent Dec. 23, 1975 Sheet20f2 3,927,823
BLANK OF A FOLDABLE MATERIAL SUCH AS CARDBOARD AND A TRAY ERECTED THEREFROM The present invention relates to a blank of a foldable material such as cardboard, which is divided by means of folding lines into areas for raising a tray with a bottom, two opposite side walls with end flaps and two opposite end walls with edge flaps folded down and overlapping the end flaps folded in for locking these.
Hitherto the end flaps and edge flaps have normally been locked by the action of an additional agent such as an adhesive or by arranging slots in the end walls.
The object of the invention is to provide a blank which can be erected to a tray with the end flaps and edge flaps locked without the assistance of an adhesive or other additional means and without the need to arrange slots in any of the tray sections.
This is achieved according to the invention by means of a blank which is characterized according to the invention by the fact that the folding line between the bottom and each of the end walls extends along an are so that when folding the adjacent end wall, this wall and the associated edge flap folded down will be held in a bent position, thus locking the folded edge flap and hence the end flaps. The invention is therefore based essentially on the fact that folding down the edge flap against a plane end wall by folding along an essentially straight folding line will not effect a locking action as long as the end wall and the edge flap are plane, whilst bending of the end wall and the edge flap when the edge flap is folded down will prevent the edge flap from dropping out away from the end wall.
The blank may be provided with known surface coats to resist liquid, the coat consisting of heat sealable plastic, which may also be of a known type, to withstand temperatures of over 200C, as is the case when the tray is to be used, for example, for ready cooked food or other food intended for heating, such as baking powder mixtures which after adding liquid can be heated and baked into cakes or bread. The tray according to the invention may also be used to advantage for ice-cream and other deep-frozen foods. It is also possible to use the materials according to the invention, which include cardboard, thin aluminium foil or similar materials, for domestic purposes where one can very easily erect the tray oneself and store food in the tray so that the tray can be placed directly into the oven for heating. After use the tray can be thrown away, thereby avoiding washing up conventional heating vessels.
An important advantage of the tray according to the invention, particularly with regard to deep-frozen foods, and the use of the tray as a baking mould, is that it can easily be opened by simply folding up the edge flaps and then folding out the end walls and side walls of the tray to release the deep-frozen goods such as ice-cream or the prepared pastry.
Some suitable embodiments of the blank and tray according to the invention are shown as examples in the accompanying drawings.
FIG. 1 shows an embodiment of the blank for the formation of a tray with tight corners, FIGS. 2, 3 and 4 show in perspective various stages of the tray during erection thereof, FIG. 5 shows one end of the erected tray seen from the inside, FIG. 6 is a perspective view of the erected tray, FIG. 7 shows an end section of another embodiment of the blank according to the invention with freely projecting end flaps, FIG. 8 shows one end of a tray erected from the blank in FIG. 7 with the end flaps on the outside of the tray, the edge flaps being folded down towards these end flaps, whilst FIG. 9 shows one end of a tray erected from the blank in FIG. 7 with the end flaps on the inside of the tray and the edge flap folded down over these end flaps.
The blank in FIG. 1 and the corresponding tray in FIGS. 2 to 6 consist of a bottom 10, two side walls 12, 14 and two end walls l6, 18. The side walls are extended with end flaps 20, which in the example shown consist of corner sections between the ends of the end walls and the side walls and can be folded along edge folding lines 22, 24 and diagonal folding lines 26 in a manner known per se.
At their upper edges the end walls are extended by edge flaps 28 which can be folded along straight, or essentially straight, transverse folding lines 30. The end wall 16 can be folded relative to the bottom 10 by folding along an arc-shaped folding line 32. The side walls have edge flanges 34 which are extended by locking flaps 35.
When the end wall 16 is folded up, it will be forced into an are shaped position, as shown in FIGS. 2 and 3, due to the fact that folding line 32 has an arcuate shape. In this position the end flaps 20 are folded in towards the outside of end wall 16 and then the edge flap 28 is folded down over the end flaps as shown in FIG. 4.
After folding down the edge flap 28 end wall 16 and the folded down edge flap 28 will be kept in the are shaped position as shown in FIGS. 5 and 6. In practice folding line 30 between edge flap 28 and end wall 16 will not normally bend out as much as folding line 32 between end wall 16 and bottom 10, but by providing bottom folding line 32 with a sufficient arc shape, sufficient bending of the edge flap folding line 30 in the erected tray is also obtained so that the edge flap can be locked in its folded down position.
The tray shown in FIG. 6 has liquid tight corners. It can easily be opened by folding up the edge flaps. If the blank has a heat sealable coat, an extra locking action can easily be obtained by heat sealing, but this should not be necessary in most cases.
FIG. 7 shows a blank corresponding to the blank in FIG. 1 with the difference that end flaps 36, which can be folded along a folding line 38, are freely projecting from the ends of the side walls, and that the side walls have no edge flaps. When erecting this blank, end flaps 36 can alternatively be placed on the outside of the end wall as shown in FIG. 8 which gives the tray a smooth inside, or end flaps 36 can be placed on the inside of the end wall as shown in FIG. 9, which gives the tray a smooth outside. In the first case edge flap 28 is folded down towards the outside of the end wall, and in the second case it is folded down towards the inside of the end wall. In both cases locking of edge flap 28 is obtained in its folded down position due to the arc-shaped bottom fold 32.
In the examples shown, bottom folding line 32 on the blank in FIGS. 1 and 7 is provided to form an are which is curved towards folding line 30 between edge flap 28 and end wall 16 so that the exterior surface of each end wall I6, 18 has a convex contour, but it is also possible to curve bottom folding line 32 in the opposite direction so that the exterior surface of each end wall 16, I8 has a concave contour and still obtain the locking action according to the invention.
I A furtherimportant advantage of the blank according to the invention is that it can have a relatively small material thickness with minimal rigidity. This does not prevent the locking action according to the invention from. being obtained for the formation of a tray with satisfactory locking action at the corners for a large number of applications.
In the examples shown, the tray walls form an essentially right angle with the bottom, but they may also incline outwards to enable the trays to be stacked on top of each other.
What is claimed is:
. l. 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 arcuateshaped 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.

Claims (7)

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.
US394443A 1972-09-13 1973-09-05 Blank of a foldable material such as cardboard and a tray erected therefrom Expired - Lifetime US3927823A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11806/72A SE366707B (en) 1972-09-13 1972-09-13

Publications (1)

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US3927823A true US3927823A (en) 1975-12-23

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US394443A Expired - Lifetime US3927823A (en) 1972-09-13 1973-09-05 Blank of a foldable material such as cardboard and a tray erected therefrom

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US (1) US3927823A (en)
JP (1) JPS4963576A (en)
AU (1) AU473546B2 (en)
CA (1) CA998026A (en)
CH (1) CH568890A5 (en)
DE (1) DE2345203A1 (en)
DK (1) DK133296C (en)
FI (1) FI52196C (en)
FR (1) FR2198865B1 (en)
IT (1) IT1005160B (en)
NL (1) NL7312513A (en)
NO (1) NO138901C (en)
SE (1) SE366707B (en)
ZA (1) ZA737113B (en)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260098A (en) * 1979-05-07 1981-04-07 Federal Paper Board Company, Inc. Tray container with reinforced sidewalls
GB2160507A (en) * 1984-06-22 1985-12-24 Uk Corrugated Limited Tray formed from a blank
US4800841A (en) * 1978-05-24 1989-01-31 Patrick Yananton Cardboard container with litter pad
WO1989004733A1 (en) * 1987-11-17 1989-06-01 Caroee Claus Jesper Method for supplying an oblong plant trough with end walls and apparatus for carrying out the method
US5307545A (en) * 1992-08-03 1994-05-03 The Mead Corporation Corrugated cardboard coffin
US5377903A (en) * 1994-06-16 1995-01-03 International Paper Company Reduced warp paperboard tray
US5379945A (en) * 1991-06-19 1995-01-10 Chuoh Pack Industry Co., Ltd. Sheets of corrugated paper for producing packages
WO2000046111A1 (en) * 1999-02-05 2000-08-10 Ducart Packaging Ind. (Investments) (1986) Ltd Receptacle for food product
US6286753B1 (en) * 1999-10-22 2001-09-11 Packaging Corporation Of America Displayable produce container and method for making the same
US20040084332A1 (en) * 2002-08-02 2004-05-06 Tumminia Patricia A. Tray with central offset score lines
US20050045517A1 (en) * 2002-06-14 2005-03-03 Holdsworth James K. Stackable display container
EP1586508A1 (en) * 2004-04-14 2005-10-19 Novacart S.P.A. Tray for containing foodstuffs and method for the realisation thereof
US20090107871A1 (en) * 2007-10-26 2009-04-30 Charles Raymond White Food Packages and Methods of Manufacture
US20090294518A1 (en) * 2008-06-02 2009-12-03 Andre Yusin Foldable Structure
US20100018410A1 (en) * 2005-02-23 2010-01-28 Covelli Jeffrey S Ovenable Shipping and Serving Container
WO2012170600A2 (en) * 2011-06-08 2012-12-13 Graphic Packaging International, Inc. Tray with curved bottom surface
CN105073588A (en) * 2013-02-12 2015-11-18 B+设备股份公司 Wedge for immobilizing objects in a box having a square or rectangular cross-section
AU2008249440B2 (en) * 2008-11-27 2016-02-18 Visy R & D Pty Ltd Leakproof container
US10232973B2 (en) 2014-11-07 2019-03-19 Graphic Packaging International, Llc Tray for holding a food product
US20190106240A1 (en) * 2017-10-09 2019-04-11 Georgia-Pacific Corrugated Llc Container with air flow cooling channels
US10336500B2 (en) 2014-11-07 2019-07-02 Graphic Packaging International, Llc Tray for holding a food product
CN111498240A (en) * 2019-01-30 2020-08-07 卓启明 Containing box capable of being quickly assembled
US11827430B2 (en) 2020-11-06 2023-11-28 Graphic Packaging International, Llc Tray for food products

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5171219U (en) * 1974-09-05 1976-06-04
SE414617B (en) * 1974-12-10 1980-08-11 Esseltepack Ab SCALED PACKAGING WITH EDGE FLANGE
JPS5350735U (en) * 1976-09-27 1978-04-28
JPS53121239U (en) * 1977-03-02 1978-09-27
DE3025151C2 (en) * 1980-07-03 1983-09-08 Unilever N.V., 3000 Rotterdam Method for producing a container, container produced according to the method and device for producing a container
AU582154B2 (en) * 1984-04-19 1989-03-16 Amcor Limited Baking container
JP2010036939A (en) * 2008-08-01 2010-02-18 San Echo Engineering:Kk Paper-made packaging vessel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008626A (en) * 1958-06-02 1961-11-14 Chicago Carton Co Folding carton lock
US3767108A (en) * 1971-04-13 1973-10-23 Federal Paper Board Co Inc Single serving package

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR893832A (en) * 1943-05-13 1944-11-02 F Allardi & Cie Soc New folding box
US3300117A (en) * 1965-04-08 1967-01-24 Container Corp Domed cover two piece carton

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008626A (en) * 1958-06-02 1961-11-14 Chicago Carton Co Folding carton lock
US3767108A (en) * 1971-04-13 1973-10-23 Federal Paper Board Co Inc Single serving package

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800841A (en) * 1978-05-24 1989-01-31 Patrick Yananton Cardboard container with litter pad
US4260098A (en) * 1979-05-07 1981-04-07 Federal Paper Board Company, Inc. Tray container with reinforced sidewalls
GB2160507A (en) * 1984-06-22 1985-12-24 Uk Corrugated Limited Tray formed from a blank
WO1989004733A1 (en) * 1987-11-17 1989-06-01 Caroee Claus Jesper Method for supplying an oblong plant trough with end walls and apparatus for carrying out the method
US5379945A (en) * 1991-06-19 1995-01-10 Chuoh Pack Industry Co., Ltd. Sheets of corrugated paper for producing packages
US5307545A (en) * 1992-08-03 1994-05-03 The Mead Corporation Corrugated cardboard coffin
US5377903A (en) * 1994-06-16 1995-01-03 International Paper Company Reduced warp paperboard tray
WO2000046111A1 (en) * 1999-02-05 2000-08-10 Ducart Packaging Ind. (Investments) (1986) Ltd Receptacle for food product
US6286753B1 (en) * 1999-10-22 2001-09-11 Packaging Corporation Of America Displayable produce container and method for making the same
US6375068B2 (en) 1999-10-22 2002-04-23 Packaging Corporation Of America Displayable produce container and method for making the same
US20050045517A1 (en) * 2002-06-14 2005-03-03 Holdsworth James K. Stackable display container
US7118023B2 (en) * 2002-06-14 2006-10-10 Holdsworth James K Stackable display container
US20040084332A1 (en) * 2002-08-02 2004-05-06 Tumminia Patricia A. Tray with central offset score lines
US6978895B2 (en) 2002-08-02 2005-12-27 International Paper Company Tray with central offset score lines
EP1586508A1 (en) * 2004-04-14 2005-10-19 Novacart S.P.A. Tray for containing foodstuffs and method for the realisation thereof
US20100018410A1 (en) * 2005-02-23 2010-01-28 Covelli Jeffrey S Ovenable Shipping and Serving Container
US20100218463A1 (en) * 2007-10-26 2010-09-02 Kraft Foods Global Brands Llc Food Packages and Methods of Manufacture
US20090107871A1 (en) * 2007-10-26 2009-04-30 Charles Raymond White Food Packages and Methods of Manufacture
US20090294518A1 (en) * 2008-06-02 2009-12-03 Andre Yusin Foldable Structure
AU2008249440B2 (en) * 2008-11-27 2016-02-18 Visy R & D Pty Ltd Leakproof container
WO2012170600A2 (en) * 2011-06-08 2012-12-13 Graphic Packaging International, Inc. Tray with curved bottom surface
US20120312807A1 (en) * 2011-06-08 2012-12-13 Fitzwater Kelly R Tray With Curved Bottom Surface
WO2012170600A3 (en) * 2011-06-08 2013-03-14 Graphic Packaging International, Inc. Tray with curved bottom surface
US9078296B2 (en) * 2011-06-08 2015-07-07 Graphic Packaging International, Inc. Tray with curved bottom surface
US20170158405A1 (en) * 2013-02-12 2017-06-08 B+ Equipment Packaging system for immobilizing objects in a box having a square or rectangular configuration
US20150353257A1 (en) * 2013-02-12 2015-12-10 B+ Equipment Wedge for immobilizing objects in a box having a square or rectangular cross-section
US9555945B2 (en) * 2013-02-12 2017-01-31 B+ Equipment Wedge for immobilizing objects in a box having a square or rectangular cross-section
CN105073588A (en) * 2013-02-12 2015-11-18 B+设备股份公司 Wedge for immobilizing objects in a box having a square or rectangular cross-section
AU2014217712B2 (en) * 2013-02-12 2018-02-22 B+ Equipment Wedge for immobilizing objects in a box having a square or rectangular cross-section
US10005606B2 (en) * 2013-02-12 2018-06-26 B+ Equipment Packaging system for immobilizing objects in a box having a square or rectangular configuration
CN105073588B (en) * 2013-02-12 2018-10-19 B+设备股份公司 Object is set to be fixed on the wedging part in the box with square or rectangular cross section
US10232973B2 (en) 2014-11-07 2019-03-19 Graphic Packaging International, Llc Tray for holding a food product
US10336500B2 (en) 2014-11-07 2019-07-02 Graphic Packaging International, Llc Tray for holding a food product
US20190106240A1 (en) * 2017-10-09 2019-04-11 Georgia-Pacific Corrugated Llc Container with air flow cooling channels
US11365021B2 (en) * 2017-10-09 2022-06-21 Georgia-Pacific Corrugated Llc Container with air flow cooling channels
CN111498240A (en) * 2019-01-30 2020-08-07 卓启明 Containing box capable of being quickly assembled
US11827430B2 (en) 2020-11-06 2023-11-28 Graphic Packaging International, Llc Tray for food products
US11952181B2 (en) 2020-11-06 2024-04-09 Graphic Packaging International, Llc Carton for food products

Also Published As

Publication number Publication date
NL7312513A (en) 1974-03-15
ZA737113B (en) 1974-08-28
FI52196B (en) 1977-03-31
FR2198865B1 (en) 1979-10-19
DK133296C (en) 1976-09-20
SE366707B (en) 1974-05-06
DK133296B (en) 1976-04-26
AU473546B2 (en) 1976-06-24
DE2345203A1 (en) 1974-03-28
FR2198865A1 (en) 1974-04-05
NO138901B (en) 1978-08-28
FI52196C (en) 1977-07-11
JPS4963576A (en) 1974-06-20
NO138901C (en) 1978-12-06
IT1005160B (en) 1976-08-20
CH568890A5 (en) 1975-11-14
AU6010873A (en) 1975-03-13
CA998026A (en) 1976-10-05

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