FR2828168A1 - Blank for folding to produce carton has side flaps with tabs at top which form lid and handle and corner flaps which are folded diagonally and fastened together by tabs inserted into slots - Google Patents

Abstract

The blank for folding to produce a carton with lid, fastening system and handle comprises a rectangular base panel (11), to which side flaps (12) are attached which have end tabs (14, 25) which form the lid. Two of the tabs (14) have handle sections (16) attached to them. Corner flaps (20) between the side flaps are folded diagonally (22) and fastened together by tabs (24) and slots (23).

Description

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 The present invention relates to a cut blank intended to produce, by folding without gluing or attachment or attached handle, a box with closing cover and grip handle.

 This type of box is in particular commonly used in the field of packaging of food products, for example for fast food in general.

 The cut blanks having a structure which makes it possible to produce, by folding without gluing, a box of any shape are very advantageous insofar as they can be stored flat, and mounted on site when it is desired to use the box made from cut blank.

 In the field of fast food, it is advantageous to be able to quickly produce a box with closing lid and grip handle from a cut blank, the box thus produced must imperatively have mechanical rigidity characteristics suitable for its use , and also often sealing properties allowing the transport of liquid food or solid-liquid mixtures, for example soups or sauces. The modern packaging which is currently preferred is made from a special cardboard called all-wood cardboard, therefore food, and treated to be perfectly impermeable to moisture and grease, even at temperature, the packaging being capable of be put in the microwave to directly consume the food contained therein.

 The object of the invention is to produce a cut blank whose structure makes it possible to easily and quickly produce, by folding without gluing or attachment or attached handle, a box with closing lid and handle.

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 grip which is particularly suitable for receiving liquid or pseudo-liquid food.

 The invention also aims to design a cut blank whose structure allows partial mounting, and easy storage in this partial mounting position by stacking or stacking.

 This problem is solved in accordance with the invention by means of a cut blank intended to produce, by folding without gluing, a box with closing lid and grip handle, comprising: - a square or rectangular central panel, intended to constitute the bottom the box body mounted; - Four main flaps extending laterally from the four sides of the central panel to which they are connected by associated fold lines, said main flaps being intended to constitute the lateral faces of the mounted box body; - Secondary flaps extending at least some of the main flaps to form, after folding, a closure cover and a grip handle associated with the mounted box body; - four corner flaps extending between two adjacent main flaps to which they are connected by associated fold lines, each corner flap having a fold line at a diagonal from the center of the central panel, around which it folds face to face during assembly, forming a folding leg with a rising upper edge, the four legs thus formed being paired, with one leg of each pair having a double notch intended, when the two legs of the pair concerned are folded one towards the other, to receive the end of the other tab, so as to constitute a locking means maintaining the integrity of the mounted can body.

 In accordance with a preferred embodiment, each

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 one of the main flaps has an isosceles trapezoid shape, the small base of which is connected to an associated side of the central panel, so as to form oblique hinges for the four folding locking tabs. The mounted box body then forms a pyramid trunk with parallel quadrangular bases.

 As a variant, provision may be made for each of the main flaps to have a rectangular or square shape, so as to form vertical hinges for the four folding locking tabs. In this case, the mounted body of the box has a parallelepiped shape, which is undoubtedly less efficient for the capacity and the cutting falls than the trunk shape of pyramid with parallel quadrangular bases obtained when the main flaps have a trapezoid shape. isosceles, but the folded legs nevertheless provide a sufficient locking effect to ensure the integrity of the mounted can body.

 In practice, we will rather prefer the previous embodiment with main flaps having an isosceles trapezoid shape.

 Advantageously, two corner flaps each have two symmetrical cutouts in the shape of a lunule facing each other to form a double notch in the formation of the corresponding locking tabs by folding along their diagonal. The insertion of the ends of the folded tabs into the lunula-shaped cutouts then allows reliable and satisfactory locking guaranteeing the integrity of the mounted can body.

 Advantageously, the free end of each of the corner flaps is shaped as a double rounded to provide a rounded end to the folding locking tab formed from each corner flap.

 More preferably, the corner flaps are

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 limited by two symmetrical inclined edges forming an acute angle between them, preferably of the order of 700.

 It is also advantageous to provide that two opposite secondary flaps each have a rectangular closing half-bolt connected on one side to an associated main flap and extended on the opposite side by a grip handle, at least one other secondary flap being provided with a middle slit extending perpendicular to the fold line of said flap and intended to allow the two handles brought face to face to pass.

 Advantageously then, each grip handle has at its base at least one notch cooperating with the end of the slot of the or each other secondary flap, in order to allow a snap-fastening of said one or more other secondary flaps.

 Preferably, each rectangular half-flap has a width which is slightly greater than the corresponding half-dimension of the upper face of the mounted can body, in order to have secure support for the handles brought face to face.

 We can then provide that each grip handle has a central recess extending to the fold line connecting said handle to the associated rectangular half-flap. In particular, the central recess of each handle may have the shape of an isosceles triangle with a point facing outwards.

 Preferably, finally, the cut blank is made of food cardboard with a plastic layer on its face corresponding to the inside of the mounted box.

 Other characteristics and advantages of the invention will appear more clearly in the light of the description which follows and of the appended drawings, relating to particular embodiments, with reference to the figures in which: - Figure 1 is a view of a cut blank,

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montage du corps de boîte à partir du flan découpé de la figure 1 ; - la figure 3 illustre en perspective l'étape suivante consistant à rabattre les quatre pattes de verrouillage formées par pliage, afin de maintenir l'intégrité du corps de boîte monté ; - la figure 4 est une vue en élévation de l'ensemble illustré à la figure 3, illustrant en outre la possibilité d'insérer un autre ensemble (représenté en trait mixte) dans le premier sous forme d'un gerbage ; - la figure 5 illustre enfin la boîte complètement montée après pliage terminal des rabats secondaires pour former le couvercle de fermeture et la poignée de préhension ; - la figure 6 illustre une variante de flan découpé dans laquelle les rabats principaux destinés à constituer les faces latérales du corps de boîte monté ne sont pas trapézoïdaux, mais sont carrés ou rectangulaires. presented flat, in accordance with the invention, in a preferred variant where the main flaps intended to constitute the lateral faces of the mounted box body have an isosceles trapezoid shape; - Figure 2 illustrates an intermediate step of

mounting the box body from the blank cut from Figure 1; - Figure 3 illustrates in perspective the next step of folding down the four locking tabs formed by folding, in order to maintain the integrity of the mounted can body; - Figure 4 is an elevational view of the assembly illustrated in Figure 3, further illustrating the possibility of inserting another assembly (shown in phantom) in the first in the form of stacking; - Figure 5 finally illustrates the completely assembled box after terminal folding of the secondary flaps to form the closure cover and the grip handle; - Figure 6 illustrates a variant blank cut in which the main flaps intended to constitute the side faces of the mounted box body are not trapezoidal, but are square or rectangular.

 In FIG. 1, there is a cut blank denoted 10 which is intended to produce, by folding without gluing, a box with a closing cover and a grip handle. The blank cut illustrated here, denoted 10, is in a single unitary part, having particular cutouts which will be explained in detail, and also having a certain number of fold lines shown here in dotted lines.

 First of all, there is a central square or rectangular panel 11, intended to constitute the bottom of the mounted box body. The center of this central panel is

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 denoted 0, and two diagonals D1, D2 are drawn perpendicular to each other, which constitute axes of symmetry of the cut blank 10.

 Four main flaps 12 extend laterally from the four sides of the central panel 11 to which they are connected by associated fold lines 13. In FIG. 1, the main flaps 12 have the shape of an isosceles trapezium, the small base of which is connects to one side of the central panel 11, at the level of the corresponding fold line 13. As will be seen later, the main flaps 12 are intended to constitute the lateral faces of the mounted box body.

 Secondary flaps extending at least some of the main flaps 12 are provided to form, after folding, a closing cover and a grip handle associated with the mounted box body. In this case, two opposite secondary flaps are provided, each consisting of a rectangular half-closing flap 14 connected on one side to a main flap 12 associated and extended on the opposite side by a grip handle 16. Each half rectangular flap 14 is connected to the associated main flap by a fold line 15 which constitutes the large base of the trapezoidal profile of the main flaps 12. There is also provided at least one other secondary flap 25, in this case two such secondary flaps which are opposite, each of these secondary flaps 25 being connected to the associated main flap 12 by a fold line 26. It can be seen that these latter secondary flaps 25 each have a median slot 27 extending perpendicular to the associated fold line 26, the two slots 27, when they come into superposition with one another at the end of assembly, as will be seen below, are intended to let the two handles 16 amen are face against face that extend the half-flaps 14.

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 Each rectangular half-flap 14 preferably has a width which is slightly greater than the corresponding half-dimension of the upper face of the mounted box body (that is to say the large base of the other two main flaps 12), to have a secure support of the handles 16 brought face to face.

 As will be seen hereinafter, the two half-flaps 14, after folding, are arranged in a common plane constituting the upper face of the mounted box body, the two handles 16 then being brought face to face by extending perpendicular to the plane of this upper face of the mounted can body.

 It can also be seen in FIG. 1 that each grip handle 16 has a central recess marked 17 which extends to the fold line 18 connecting said handle to the associated rectangular half-flaps 14.

Finally, it will be noted that each grip loop 16 has at least one notch 19 at its base, in this case two such notches. As will be seen later, these notches 19 are intended to cooperate with one end of the slot 27 of the other two secondary flaps 25, in order to allow a snap-fastening of said secondary flaps.

 The cut blank 10 finally comprises four corner flaps 20 extending between two adjacent main flaps 12 to which they are connected by associated fold lines 21. Each of these four corner flaps 20 has a central fold line 22 at level of a diagonal starting from the center 0 of the central panel 11. Each corner flap 20 can then be folded around this fold line 22, to come face against face (that is to say internal face against internal face) during mounting, then forming a tab which is foldable, and whose upper edge is rising. The four legs thus formed are paired, with one leg of each pair pre-

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 feeling a double notch 23 intended, when the two legs of the pair concerned are folded towards one another, to receive the end of the other leg, so as to constitute a locking means maintaining the integrity of the mounted can body.

 In this case, it can thus be seen that two corner flaps 20 each have two symmetrical cutouts (with respect to their diagonal) in the form of a lunula 23, these cutouts coming opposite one another to form a double notch the formation of the corresponding locking tabs by folding along their diagonal 22. The other two corner flaps 20 are exempt from such cuts, because, after forming by folding the corresponding folding tabs, the end of these latter flaps angle is intended to pass into the associated double notch.

 It can be seen here that the free end 24 of each of the corner flaps 20 is shaped in double rounded shape, with a symmetrical profile with respect to the fold line 22. Such a cut-out makes it possible to obtain a rounded end for the locking tab. foldable formed from each corner flap 20, after folding thereof to bring the two internal half-faces into contact with one another.

 As has been said above, the folding legs have a rising upper edge. This is achieved by providing that the edges 28 delimiting each of the corner flaps 20 are inclined relative to the adjacent fold lines 26 and 15. Of course, the inclination is such that the angle a formed by the two symmetrical inclined edges 28 of the same corner flap 20 is acute, a typical value being for example of the order of 700.

 We will now explain in more detail the progressive assembly of the box with a closing cover and

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 handle for gripping from the cut blank which has just been described in detail with reference to FIG. 1.

 In FIG. 2, this is an intermediate situation, in which the four main flaps 12 have been raised around their basic fold line 13, this raising being accompanied by a folding of each of the four flaps d angle 20 around their diagonal 22.

In this position, each half of the corner flap 20 has an internal face which is in contact with the internal face of the other half. The two symmetrical cutouts 23 of the two corner flaps 20 concerned then come opposite one another to form a double notch.

 In the representation of FIG. 2, the four tabs obtained from the folding of the four corner flaps 20 extend in two substantially parallel planes. It is clear that in this position there is no integrity worthy of the name for the mounted box body, that is to say that the least force exerted on the inside of the box body would suffice to unfold the body of box temporarily mounted by unfolding the folding legs obtained from the corner flaps 20.

It will also be noted that the four secondary flaps, that is to say the two slit flaps 25, and the two half-flaps 14 extended by their grip handle 16, are directed upwards, in their position which comes naturally insofar as they directly extend the main trapezoidal flaps 12 which now form the lateral faces of the box body.

 In FIG. 3, the four locking tabs obtained by folding the corner flaps 20 have been folded down, these folds being effected around each double line forming a hinge 21, each of these double lines in fact corresponding to two lines folding 21 of the same corner flap 20 which came into contact with one another as a result of the temporary folding.

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In addition, the end 24 of one of the folded tabs is brought into the lunula-shaped cutout 23 of the other corresponding tab. In Figure 3, the establishment of the tab ends in their double notch is complete, the drawdowns are only symbolized by two arrows. In this position, the integrity of the mounted can body is truly obtained. This integrity results from the cooperation between the upper double edge 28 of the inserted tab with the upper end of the double notch 23 of the other associated tab.

The shape of the lunula chosen for the notches 23 is advantageous in this respect, since the end constrictions pinch the end of the inserted tab, and therefore favor the maintenance in the locked position.

 The inclination of the double edge 28 relative to the plane of the central panel forming the bottom of the box body contributes greatly to the maintenance of the wedging force obtained, and therefore to the stability of the shape maintenance of the box body mounted. The inclination of the lines forming hinges 21 relative to the vertical is actually very advantageous for having a clearly marked locking effect. Indeed, the hinges obtained are then oblique for the four folding locking tabs, so that a slight inclination angle at the level of the blank cutout has the effect of producing a very enlarged inclination angle after folding each legs on the associated side face of the box body.

 Thanks to this integrity of the box body, it is possible to store different boxes partially mounted in the position of FIG. 3, by natural stacking, as illustrated in FIG. 4 where a second line has been shown box B2 in the same partially assembled state inserted in a first partially mounted box B1. We can then have a stack of a large number of boxes which allows a

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 rational use and very convenient in fast food.

 To complete the partially assembled box, it then suffices to finish folding the secondary flaps, this folding being naturally carried out only after insertion of the content provided for the packaging thus formed.

 This folding is carried out in a simple manner, starting by folding down about 900 the two half-flaps 14 to bring them into a common horizontal plane, while straightening the two gripping handles 16 by 900 relative to this plane. The width of the half-flaps 14 is chosen to ensure a frank contact at the level of the edges in contact arranged in a vertical median plane, so that the two gripping handles 16 are well brought face to face, without intermediate space at the level of their base. This is particularly important when the contents of the package are liquid or semi-liquid contents, since the upper closure of the box is very secure. It then suffices to fold down the two secondary flap (s) 25 by passing the double grip handle 16 into the associated slot 27. This folding of approximately 900 of the secondary flaps 25 around their fold line 26 brings said flaps into a plane horizontal substantially parallel to the bottom of the box, and a click occurs at the notches 19 provided for this purpose at the base of each grip handle 16. The box is then in a fully assembled and closed state, as illustrated on Figure 5.

It can be seen that the double triangular cutout 17 allows one or two fingers to pass for the convenient transport of the box, without this transport risking raising the closing half-flaps 14, due to the locking effected by the two secondary flaps 25 at their middle slit 27.

 It is possible to provide a variant in

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 which each of the main flaps has a shape not trapezoidal, but rectangular or square, so as to form vertical hinges for the four folding locking tabs. Such a variant is illustrated in FIG. 6.

 In this figure, we find the same components as before, which have been given the same references increased by 100.

 It can therefore be seen that the four main flaps 112 have a rectangular shape, so that the mounted box body then has a parallelepiped shape (not shown here). In this case, the fold lines 121 associated with the corner flaps 120, when brought into contact with one another, are vertical, so that the hinges of the locking tabs pivot about an axis vertical. As a result, the angle of inclination of the upper edges of the legs 128 is retained during this folding, and not increased as was the case in the previously described variant with trapezoidal main flaps. Such a variant can also be envisaged insofar as the locking effect obtained by inserting the ends of the legs is found in the associated double notch. However, it should be noted that this variant is less efficient for the capacity and the cutting falls than the previous form, in the trunk of a pyramid with parallel quadrangular bases.

 In the case of using the aforementioned box according to one or other of its two variants described, in the field of fast food in general, it will be advantageous to make the blank cut from food cardboard with a plastic layer , or liner, on its face corresponding to the inside of the mounted box. This liner will, for example, be made of polyethylene.

The material used will preferably be a cardboard says everything

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 wood, therefore food, which cardboard is made perfectly impermeable to humidity and grease even at temperature thanks to its polyethylene liner. This material allows it to be worked like any other compact cardboard, which also leaves the door open to any type of impression in the image of the restaurateur.

 It has thus been possible to produce a cut blank making it possible to produce, by folding without gluing, a box with closing lid and grip handle according to a rapid and reliable assembly. A single piece of cardboard is then used, and rapid shaping is carried out only by folding, without gluing, or the need to use elastic ties or a metal handle to keep it in volume.

 Such a blank is particularly advantageous in the field of fast food, insofar as it makes it possible to produce perfectly sealed boxes capable of receiving liquid or semi-liquid contents.

 The invention is not limited to the embodiments which have just been described, but on the contrary encompasses any variant incorporating, with equivalent means, the essential characteristics set out above.

Claims (12)

1. Cut-out blank intended to produce, by folding without gluing, a box with closing lid and grip handle, characterized in that it comprises: - a central or square panel (11; 111) square or rectangular, intended to constitute the bottom of the box body mounted; - four main flaps (12; 112) extending laterally from the four sides of the central panel (11; 111) to which they are connected by associated fold lines (13; 113), said main flaps being intended to constitute the side faces of the mounted can body; - secondary flaps (14, 16, 25 i 114; 116; 125) extending at least some of the main flaps (12; 112) to form, after folding, a closing cover and a grip handle associated with the mounted box body; - four corner flaps (20; 120) extending between two adjacent main flaps (12; 112) to which they are connected by associated fold lines (21; 121), each corner flap (20; 120) having a fold line (22; 122) at a diagonal from the center (O) of the central panel (11; 111), around which it folds face to face during assembly by forming a foldable tab on board upper riser, the four legs thus formed being paired, with one leg of each pair having a double notch (23; 123) intended, when the two legs of the pair concerned are folded towards one another, to receive the end of the other tab, so as to constitute a locking means maintaining the integrity of the mounted can body.  2. blank cut according to claim 1, charac- <Desc / CRUD Page number 15>  terized in that each of the main flaps (12) has an isosceles trapezoid shape, the small base of which is connected to an associated side of the central panel (11), so as to form oblique hinges for the four folding locking tabs.  3. blank cut according to claim 1, characterized in that each of the main flaps (112) has a rectangular or square shape, so as to form vertical hinges for the four folding locking tabs.  4. blank cut according to one of claims 1 to 3, characterized in that two corner flaps (20; 120) each have two symmetrical cuts in the form of a lunula (23; 123) facing one of the 'other to form a double notch in the formation of the corresponding locking tabs by folding along their diagonal (22; 122).  5. blank cut according to one of claims 1 to 4, characterized in that the free end (24; 124) of each of the corner flaps (20; 120) is shaped in double rounded to provide a rounded end to the folding locking tab formed from each corner flap.  6. Cut blank according to one of claims 1 to 5, characterized in that the corner flaps (20) are delimited by two symmetrical inclined edges (28; 128) forming between them an acute angle (a), preferably around 700.  7. blank cut according to one of claims 1 to 6, characterized in that two opposite secondary flaps (14,16; 114,116) each comprise a rectangular half-closing flap (14; 114) connected on one side to a main flap (12; 112) associated and extended on the opposite side by a grip loop (16; 116), at least one other secondary flap (25; 125) being provided with a <Desc / Clms Page number 16>  middle slot (27; 127) extending perpendicular to the fold line (26; 126) of said flap and intended to allow the two handles (16 i 116) brought face to face to pass.  8. Cut blank according to claim 7, characterized in that each grip handle (16; 116) has at its base at least one notch (19; 119) cooperating with the end of the slot (27; 127) of the of each other secondary flap (25; 125), in order to allow snap-fitting of said one or more other secondary flaps.  9. blank cut according to claim 7 or claim 8, characterized in that each rectangular half-flap (14; 114) has a width which is slightly greater than the corresponding half-dimension of the upper face of the mounted can body, to have a secure support of the handles (16; 116) brought face to face.  10. Cut blank according to one of claims 7 to 9, characterized in that each grip handle (16; 116) has a central recess (17; 117) extending to the fold line (18; 118 ) connecting said handle to the associated rectangular half-flap (14 i 114).  11. A blank cut according to claim 10, characterized in that the central recess (17; 117) of each handle has the shape of an isosceles triangle with a point facing outwards.  12. Cut blank according to one of claims 1 to 11, characterized in that it is made of food board with a plastic layer on its face corresponding to the inside of the mounted box.