GB2364694A

GB2364694A - Cartons

Info

Publication number: GB2364694A
Application number: GB0017133A
Authority: GB
Inventors: Kevin Topfer
Original assignee: Field Group PLC
Current assignee: Field Group PLC
Priority date: 2000-07-12
Filing date: 2000-07-12
Publication date: 2002-02-06
Also published as: GB0017133D0

Abstract

A cardboard carton has upstanding side walls of double thickness each comprising an outer wall panel (5) hinged to the carton base (1) and an inner wall panel (6) hinged to the outer wall panel, the inner wall panel being held in position by its engagement with an extension of an adjoining side wall (2, 3) sandwiched between the said wall panels. Tabs (11) on the inner wall panel (6) may engage in slots (14) each along a fold line between the extension (15) and a tab (13) for overlying the base (1), or between an extension flap (12) doubled back over the extension (15) and the tab (13), a stabilizing flap (7) also overlying the base panel (1) in the erect condition.

Description

<Desc/Clms Page number 1> "Cartons" This invention relates to cartons made of cardboard, paperboard or similar lightweight foldable sheet material.

An upstanding side wall of such a carton is often made of double thickness by folding it over inwardly. The folded over panel may be held in its desired position, face to face with the outer panel of the wall, by providing it with a stabilising flap which is reverse folded to lie on the base of the carton, which it engages frictionally. However, this does not positively hold the wall panels together in the desired manner. A more positive hold may be achieved by providing one or more tabs on the edge of the folded over panel, which engage in slots in the base. However, this breaks up the otherwise smooth surface of the base and is unsightly. of course, the panels may be glued together, but this is to be avoided if the carton is to be erected manually by a user.

According to the present invention there is provided a carton made of cardboard, paperboard or similar lightweight foldable sheet material, having an upstanding side wall of double thickness comprising an outer wall panel hinged to the carton base and an inner wall panel hinged to the other wall panel, the inner wall panel being held in position by its engagement with an extension of an adjoining side wall sandwiched between the said wall panels.

Preferably the said inner wall panel is in engagement with two of said extensions, one on each of the two side walls which adjoin the respective ends of said double thickness side wall.

Preferably the said inner side wall panel has at least one locking tab which engages in a slot in a said

extension. Preferably the or each said extension comprises a flap hinged to its associated side wall and sandwiched between said inner and outer wall panels, and a sub-flap hinged to said flap and overlying the carton base, said slot extending along the connection between said flap and said sub-flap.

In one form of the invention the said flap is directly hinged to its associated side wall. In an alternative arrangement the said flap is directly hinged to a connecting panel which is directly hinged to the associated side wall, said flap being doubled back on said connecting panel.

The scope of the invention also extends to blanks for making cartons as set forth above.

Two embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which:- Figure 1 is a plan view of a cardboard blank for making a carton according to a first embodiment; Figure 2 is a perspective view of a carton partially erected from the blank of Figure 1; Figure 3 is a perspective view of the fully erected carton; Figure 4 is a plan view of the blank of a second embodiment; and Figures 5 to 7 are perspective views showing successive stages in the erection of a carton from the blank of Figure 4.

Referring first to Figure 1, a blank for making a four sided carton with a hinged lid includes a base panel 1, front and back wall panels 2 and 3, and a lid panel 4. The two end walls of the carton are of double thickness, each comprising an outer wall panel 5 hinged to the base panel 1 and an inner wall panel 6 hinged to the panel 5. The inner wall panel 6 carries a stabilising flap 7. Thus far, the blank is of a

conventional nature.

Each of the front and back wall panels 2 and 3 has an extension flap 8 hinged to each of its ends. Each flap 8 carries a sub-flap 9 which has been cut from the adjacent outer end wall panel 5. A slot 10 is formed along the join between the flap 8 and its sub-flap 9. Locking tabs 11 are defined on the inner wall panels 6, cut out from the stabilising flaps 7.

Referring now to Figures 2 and 3, the basic manner of erection of the carton will be clear to those skilled in the art. Only those features which particularly pertain to the present invention will therefore be described in detail. The extension flaps 8 on the front back wall panels 2 and 3 are folded in at right angles to those walls, and the sub-flaps 9 thereon are folded in so as to lie on the base 1. As a result, the slots 10 extend above the underlying join between the base and the outer wall panel 5. Then, when the end walls are erected by folding up the panels 5 and folding in the inner wall panels 6 and stabilising flaps 7, the locking tabs 11 on the wall panels 6 are engageable in the slots 10, as shown in Figure 3, so as positively to hold the end wall panels together.

Referring now to the embodiment of Figures 4 to 7, this only differs from the previous embodiment in the manner in which the slots to receive the locking tabs 11 are provided. Parts which are the same as those of the previous embodiment are given the same reference numerals and will not be described again. In this embodiment the extension flaps 12 and their sub-flaps 13, formed with slots 14, are connected to the front and back walls 2 and 3 by way of connecting panels 15, instead of being connected directly, which results in the sub-flaps 13 being cut out of the inner wall panels 6 rather than out of the outer wall panels 5. As a result the cut-outs in question are no longer visible from the outside as they are in the first embodiment

(see Figures 2 and 3). The manner in which the carton is erected will be clear from Figures 5 to 7.

Both of the above described embodiments of the invention may be erected either by hand or by machine.

Claims

Claims 1. A carton made of cardboard, paperboard or similar lightweight foldable sheet material, having an upstanding side wall of double thickness comprising an outer wall panel hinged to the carton base and an inner wall panel hinged to the other wall panel, the inner wall panel being held in position by its engagement with an extension of an adjoining side wall sandwiched between the said wall panels.
2. A carton as claimed in claim 1, wherein the said inner wall panel is in engagement with two of said extensions, one on each of the two side walls which adjoin the respective ends of said double thickness side wall.
3. A carton as claimed in claim 1 or 2, wherein the said inner side wall panel has at least one locking tab which engages in a slot in a said extension.
4. A carton as claimed in claim 3, wherein the or each said extension comprises a flap hinged to its associated side wall and sandwiched between said inner and outer wall panels, and a sub-flap hinged to said flap and overlying. the carton base, said slot extending along the connection between said flap and said sub-flap.
5. A carton as claimed in claim 4, wherein said flap is directly hinged to its associated side wall.
6. A carton as claimed in claim 4, wherein the said flap is directly hinged to a connecting panel which is directly hinged to the associated side wall, said flap being doubled back on said connecting panel.

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7. Cartons as claimed in claim 1, substantially as hereinbefore described with reference to the accompanying drawings.
8. A blank for making a carton as claimed in any of claims 1 to 7.