FR2832127A1 - Can with lateral convex walls and lower and upper walls with edge regions along which walls are connected, lateral walls having central convex region spaced from upper and lower walls - Google Patents

Abstract

The can comprises lateral walls (2,3), a lower wall (4) and an upper wall (5) and edge regions (6,7) along which the lateral, lower and upper walls are connected together. At least two opposite lateral walls each comprise a central convex region (10) spaced from the lower and upper walls. This central region has a first radius of curvature (R3) in a first median plane orthogonal to the central region and is vertical when the can rests by its lower wall on a horizontal surface. A second radius of curvature in a second median plane orthogonal to the central region is horizontal when the can rests by its lower wall on a horizontal surface.

Description

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The present invention relates to a container of generally polyhedral shape and of the type comprising a side wall belt, a lower wall and an upper wall which close the side wall belt, and edge regions along which the lower side walls and higher are linked together,
The invention applies in particular to cans of small capacity, in particular around 20 liters.

 Are known in the state of the art such cans which are of rectangular shape and which are made of plastic. Their parallelepiped shape allows a large number to be grouped in a reduced volume, in particular by stacking on pallets, which facilitates their handling and storage.

 It would be desirable to reduce the cost of these cans. One solution would be to reduce the thickness of their walls and therefore the amount of material used. However, this solution would reduce their rigidity and their resistance to stacking, which is not desirable.

 An object of the invention is to solve this problem by providing a container of the aforementioned type which is of reduced cost and which has satisfactory rigidity and resistance to stacking.

 To this end, the subject of the invention is a container of the aforementioned type, characterized in that at least two first opposite lateral walls each comprise a central convex region spaced from the lower and upper walls, this central region having a first radius of curvature , in a first median plane and orthogonal to the central region and intended to be substantially vertical when the container rests by its lower wall on a horizontal surface, and a second radius of curvature, in a second median plane orthogonal to the central region and intended to be substantially horizontal when the container rests by its lower wall on a horizontal surface.

 According to particular embodiments, the container can include one or more of the following characteristics, taken alone or in any technically possible combination:

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- le premier rayon de courbure est compris entre environ 4300 et environ 5000 mm ; - le premier rayon de courbure est compris entre environ 4500 et environ 4800 mm ; - le deuxième rayon de courbure est compris entre environ 200 et environ 1700 mm ; - les deux premières parois latérales ont des dimensions latérales supérieures à celles des autres parois latérales, et le deuxième rayon de courbure est compris entre environ 600 et environ 1300 mm ; - le deuxième rayon de courbure est compris entre environ 900 et environ 1000 mm ; - les deux premières parois latérales ont des dimensions latérales inférieures à celles des autres parois latérales, et le deuxième rayon de courbure est compris entre environ 225 et environ 600 mm ; - le deuxième rayon de courbure est compris entre environ 250 et environ 350 mm ; - toutes les parois latérales comprennent chacune une région centrale convexe espacée des parois inférieure et supérieure, cette région centrale convexe possédant un premier rayon de courbure, dans un premier plan médian orthogonal à la région centrale et destiné à être vertical lorsque le bidon repose par sa paroi inférieure sur une surface horizontale, et un deuxième rayon de courbure, dans un deuxième plan médian orthogonal à la région centrale et destiné à être horizontal lorsque le bidon repose par sa paroi inférieure sur une surface horizontale ; - les régions d'arêtes reliant au moins deux parois latérales opposées à la paroi inférieure et/ou à la paroi supérieure sont convexes et possèdent, dans des plans orthogonaux à ces régions d'arêtes et destinés à être verticaux quand le bidon repose par sa paroi inférieure sur une surface horizontale, un troisième rayon de courbure compris entre environ 8 et environ 16 mm ; - le troisième rayon de courbure est compris entre environ 10 et environ 14 mm ; - the first radius of curvature is between approximately 4000 and approximately 5500 mm;

- the first radius of curvature is between approximately 4300 and approximately 5000 mm; - the first radius of curvature is between approximately 4500 and approximately 4800 mm; - the second radius of curvature is between approximately 200 and approximately 1700 mm; - The first two side walls have lateral dimensions greater than those of the other side walls, and the second radius of curvature is between approximately 600 and approximately 1300 mm; - The second radius of curvature is between approximately 900 and approximately 1000 mm; the first two lateral walls have lateral dimensions smaller than those of the other lateral walls, and the second radius of curvature is between approximately 225 and approximately 600 mm; the second radius of curvature is between approximately 250 and approximately 350 mm; - All the side walls each include a convex central region spaced from the lower and upper walls, this convex central region having a first radius of curvature, in a first median plane orthogonal to the central region and intended to be vertical when the container rests by its lower wall on a horizontal surface, and a second radius of curvature, in a second median plane orthogonal to the central region and intended to be horizontal when the container rests by its lower wall on a horizontal surface; - the edge regions connecting at least two lateral walls opposite the bottom wall and / or the top wall are convex and have, in planes orthogonal to these edge regions and intended to be vertical when the container rests by its lower wall on a horizontal surface, a third radius of curvature of between approximately 8 and approximately 16 mm; the third radius of curvature is between approximately 10 and approximately 14 mm;

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 the third radius of curvature is between approximately 12 and approximately 13 mm; - At least two opposite side walls each comprise at least one reinforcement region projecting outwards, the reinforcement regions extending substantially from the lower wall towards the upper wall or from the upper wall towards the lower wall; at least two opposite side walls each comprise two reinforcement regions projecting outwards, a first lower reinforcement region extending from the lower wall towards the upper wall and a second upper reinforcement region extending from the upper wall towards the lower wall; each reinforcement region is spaced laterally from the edge regions connecting the side wall to which it belongs to the adjacent side walls; - The reinforcement regions are formed by bulges of the side walls to which they belong; - At least one edge region connecting two adjacent side walls comprises at least one lower section or one upper section having, in a plane substantially orthogonal to said edge region and intended to be substantially vertical when the container rests by its lower wall on a horizontal surface, an additional radius of curvature of between approximately 100 and approximately 1500 mm; said edge region comprises a lower section and an upper section each having, in a plane substantially orthogonal to said edge region and intended to be substantially vertical when the container rests by its lower wall on a horizontal surface, a radius of additional curvature between about 100 and about 1500 mm; the or each additional radius of curvature is between approximately 125 and approximately 800 mm; - the or each additional radius of curvature is between approximately 150 and approximately 350 mm; - Said or each of said section (s) of said edge region extends towards the upper wall from a lower vertex connecting said two walls

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 lateral adjacent to the lower wall, or extends towards the lower wall from an upper vertex connecting said two lateral walls adjacent to the upper wall; - the container is generally parallelepipedic; - the container is made of plastic; and - the container was obtained by extrusion blow molding.

 The invention will be better understood on reading the description which follows, given solely by way of example, and made with reference to the accompanying drawings, in which: - Figure 1 is a schematic perspective view of a can according to the invention, - Figures 2 and 3 are schematic side views of the container of Figure 1, respectively illustrating the shape of its large side walls and its small side walls, - Figure 4 is a schematic view from above of can of Figure 1, - Figure 5 is a schematic bottom view of the can of Figure 1, and - Figure 6 is a partial and schematic section taken along line VI-VI of Figure 5 and illustrating the form d 'an ascending edge region connecting a large side wall to a small side wall.

 There is shown in Figures 1 to 6 a container 1 with a capacity of 20 liters produced by extrusion blow molding of a plastic material such as polyethylene.

 This container 1 is generally rectangular in shape and comprises two large opposite side walls 2, two small opposite side walls 3, a lower wall 4 and an upper wall 5.

 The large side walls 2 are connected to the small side walls 3 along rising edge regions 6 which extend from the bottom wall 4 to the top wall 5. Thus, the side walls 2 and 3 form a belt of walls closed by the lower 4 and upper 5 walls.

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 The large side walls 2 are connected to the lower 4 and upper 5 walls by edge regions 7 which extend from a small side wall 3 to the other.

 The small side walls 3 are connected to the lower 4 and upper 5 walls by edge regions 7 which extend from one large side wall 2 to the other.

 The bottom wall 4 defines with each pair of adjacent side walls 2 and 3 a top or bottom corner 8. Thus, the container 1 has four bottom tips 8.

 The upper wall 5 defines with each pair of adjacent side walls 2 and 3 an upper vertex or corner 9. Thus, the container 1 has four upper vertices 9.

 As illustrated in FIG. 2, the container 1 has a height H of approximately 408 mm, the large side walls 2 have a width L of approximately 285 mm.

The small side walls 3 have a width l (FIG. 3) of approximately 225 mm.

 Each side wall 2 comprises a central section 10, a lower section 11 and an upper section 12. The sections 11 and 12 separate the central section 10 respectively from the lower wall 4 and from the upper wall 5.

 The lower 11 and upper 12 sections each have a height of approximately 106 mm and the central section has a height of approximately 196 mm.

 The side wall 2 considered comprises in its lower section 11 a lower reinforcement bulge 14 which projects outwards.

 As illustrated in FIG. 2, this bulge 14 has, from the front, substantially an isosceles trapezoid shape converging upwards. It extends from the lower wall 4 towards the upper wall 5, substantially up to a horizontal line of recess 15 separating the central section 10 and the lower section 11.

 This line 15 extends over most of the width of the wall 2 considered but does not extend to the edge regions 6 connecting it to the adjacent walls 3.

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 As can be seen in FIG. 3, the reinforcement bulge 14 protrudes by a distance d relative to the rest of the lower section 11. This distance d decreases as it approaches the hooking line 15.

 The reinforcement bulge 14 is spaced laterally from the two edge regions 6 connecting the wall 2 considered to the small adjacent side walls 3.

 The reinforcement bulge 14 is substantially symmetrical relative to a median plane P1, vertical and orthogonal, that is to say normal, to the wall 2 considered. The trace of this plane P1 has been shown in dashed lines in FIGS. 2 and 4. This plane P1 is situated substantially at equal distance from the two small side walls 3.

 The wall 2 considered also has an upper reinforcement bulge 16 which is symmetrical with the lower bulge 14 relative to a median plane P2, horizontal and orthogonal, that is to say normal, to the side wall 2 considered. The trace of this plane P2 has been shown in phantom in FIG. 2. This plane P2 extends substantially at equal distance from the lower wall 4 and the upper wall 5.

 Due to the mentioned symmetry, the structure of the upper bulge 16 will not be described in detail. It will simply be noted that the upper bulge 16 extends from the upper wall 5 downwards to a horizontal drop line 17 separating the central section 10 and the upper section 12 from the side wall 2 considered.

 As can be seen in FIG. 3, the central section 10 is, thanks to the hook lines 15 and 17, slightly set back towards the inside of the container 1 relative to the lower 11 and upper 12 sections of the wall 2 considered. This central section 10 is intended to receive a label carrying information on the content of the container 1 or a lining sleeve.

 The central section 10 is convex and has in the plane P1 a radius of curvature R1 substantially constant and of approximately 4586 mm and in the plane P2 a radius of curvature R2 substantially constant and of approximately 957 mm.

The outer ends of rays R1 and R2 have been indicated by arrows in Figures 3 and 4. To facilitate understanding, the arc of a circle

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 corresponding to radius R1 has been extended in phantom in Figure 3 beyond the central section 10, and the curvature of this arc has been exaggerated.

 Likewise, the arc of a circle corresponding to the radius R2 has been extended in phantom in FIG. 4 beyond the central section 10.

 The lower 11 and upper 12 sections have, in the plane P1, substantially constant radii of curvature and approximately 333 mm in the bulges 14 and 16 and approximately 380 mm outside these bulges.

 Each side wall 3 also includes a central section 10, a lower section 11 and an upper section 12.

 The central section 10 of the wall 3 considered is separated from the lower section 11 by a horizontal hook line 15 and from the upper section 12 by a horizontal hook line 17. These lines 15 and 17 are placed in the extension of lines 15 and 17 large side walls 2 adjacent, so that the central sections 10, lower 11 and upper 12 of the side walls 2 and 3 extend laterally.

 The central section 10 of the wall 3 considered is also doubly convex and has, in a median plane P3, vertical and orthogonal, that is to say normal, to the wall 3 considered, a radius of curvature R3 substantially constant and d '' approximately 4586 mm. The trace of the plane P3 is shown in phantom in Figures 3 and 4 and the outer end of the radius R3 has been materialized by an arrow in Figure 2. The plane P3 extends substantially equidistant from the large side walls 2 .

 The central section 10 of the wall 3 considered has, in a median plane P4, horizontal and orthogonal, that is to say normal, to the wall 3 considered, a radius of curvature R4 substantially constant of approximately 316 mm. The trace of the plane P4, which coincides with the plane P2 mentioned above, has been shown in phantom in FIG. 3, and the outer end of the radius R3 has been shown by an arrow in FIG. 4.

 In the example shown, the small side walls 3 do not have reinforcing bulges like the side walls 2 but, in a variant not shown, such bulges can be provided there.

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 The edge regions 7 extend substantially continuously over the entire periphery of the lower face 4, passing through the lower vertices 8, and over the entire periphery of the upper surface 5, passing through the upper vertices 9.

 The upper wall 5 comprises a recessed central region 20 provided with an orifice 21 for discharging the contents of the container 1 and a handle 22 for manual entry. The orifice 21 is intended to be closed by screwing a plug, not shown.

 The handle 22 projects slightly above the peripheral region 23 of the upper wall 5. This peripheral region 23 also has three reliefs 24 which also project slightly upwards relative to the rest of the peripheral region 23.

 The projecting part of the handle 22 and the reliefs 24 are intended to engage in complementary cavities, respectively 25 and 26, provided in the bottom wall 4 (Figure 5).

 This lower wall 4 also forms a support base by means of which the container 1 can bear on another container 1 or on the ground to be in its position shown in FIGS. 1 to 4.

 As illustrated in FIG. 1, each edge region 6 comprises: - a central section 30, located between the central sections 10 of the corresponding adjacent side walls 2 and 3, - a convex lower section 31, located between the lower sections 11 of the corresponding adjacent side walls 2 and 3, - a convex upper section 32, located between the upper sections 12 of the corresponding adjacent side walls 2 and 3.

 As seen in FIG. 6, the lower sections 31 extend upwards from the lower vertices 8, and the upper sections 32 extend downwards from the upper summits 9.

 Note that in Figure 6 the thickness of the edge region 6 and the lower 4 and upper 5 walls has not been shown.

 The central sections 30 are vertical.

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 Each lower section 31 has, in a vertical plane orthogonal, that is to say normal, to the corresponding edge region 6 (such as the plane of FIG. 6), a radius of curvature R5 of approximately 200 mm .

 Likewise, the upper sections 32 of the two edge regions 6 furthest from the orifice 21 (behind in FIG. 1) also have the radius of curvature R5, in orthogonal vertical planes, that is to say normal, with corresponding edge regions 6.

 It will be noted that the radii R5 of the lower section 31 and of the upper section of the edge region 6 of FIG. 6 have been materialized by arrows in this figure.

 Each edge region 7 has, practically in each vertical and orthogonal, that is to say normal, plane with the corresponding side wall 2 or 3, a radius of curvature R of approximately 12 mm. The outer end of this radius R has been materialized by an arrow in FIG. 2, this radius then being taken in the plane P3 mentioned previously, by an arrow in FIG. 3, this radius R then being taken in the plane P1 mentioned previously, and by an arrow in FIG. 6, this radius R then being taken in the section plane of FIG. 6.

 This radius R remains constant substantially over the entire periphery of the lower face 4 and the upper face 5, including in the reinforcement bulges 14 and 16, except possibly in a short central section of the edge region 7 adjacent to the orifice 21.

 It has been found that the reinforcement bulges 14 and 16 in the side walls 2 stiffen the container 1 and increase its resistance to stacking.

 It can be considered that this increase in the resistance to stacking is partly due to the fact that these bulges 14 and 16 increase the surfaces of the lower wall 4 and of the upper wall 5 intended to bear on another can 1 and to serve as support for another container 1.

 The use of bulges to constitute the reinforcements 14 and 16 makes it possible to keep a thickness of side walls 2 constant over their entire width. The reinforcements 14 and 16 therefore do not induce an increase in the mass of the container 1.

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 It has also been found that the convexity of the side walls 2 both in the plane P1 and in the plane P2, and the convexity of the side walls 3 both in the plane P3 and in the plane P4 also contribute, but independently , to increase the rigidity of the container 1 and its resistance to stacking.

 When a canister 1 is subjected to too much vertical compressive force, the side walls are deformed laterally towards the inside of the canister. The double convexity of the side walls 2 and 3 of the container 1 of Figures 1 to 5 makes it possible to delay this deformation and therefore to increase the resistance of the container 1 to stacking.

 Furthermore, this characteristic does not induce an increase in the mass of the container 1.

 Note that this characteristic may only be present on some of the side walls.

 It has also been found that the radius of curvature R5 of the lower sections 31 and of some of the upper sections 32 of the edge regions 6 makes it possible, independently, to increase the rigidity of the container 1 and its resistance to stacking.

 Indeed, on radius of curvature R5 makes it possible to ensure a substantially uniform thickness of the container in the edge regions 6, and in particular in their lower 31 and upper 32 sections. However, the radius R5 is sufficiently small to limit the rolling effect of these sections 31 and 32, which effect would lead to a premature crushing of the container 1 during its stacking by displacement of the sections 31 and 32 towards the central sections 30 of the edge regions 6.

 It will be noted that this characteristic does not induce an increase in the mass of the container 1 and that it may only be present in certain lower sections 31 and / or upper sections 32.

 It has also been found that the radius of curvature R of the edge regions 7 makes it possible, independently, to increase the rigidity of the can 1 and its resistance to stacking. We can consider that this radius R is large enough to avoid the stress concentrations in the regions 7, which concentrations would decrease the resistance of the container 1. It

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 is moreover sufficiently weak to limit the rolling effect of the regions 7, which effect would lead to premature crushing of the container 1 during its stacking by displacement of the edge regions 7 towards the central sections 10 of the side walls 2 and 3.

 It will also be noted that this characteristic does not induce an increase in the mass of the container 1.

 Thus, the thickness of the walls of the container 1 and its mass can be reduced to rigidity and to constant stacking resistance.

 Thus, the mass of the container 1 can be approximately 700 grams, which corresponds to a reduction of approximately 20% compared to conventional containers. The amount of material required to make the container 1 and its cost are therefore reduced.

 Furthermore, the handle 22 and the reliefs 24 allow, with the complementary cavities 25 and 26 to limit the relative displacements between two cans 1 stacked one on the other.

mm. In general, the radii R1 and R3 can be between approximately 4000 and approximately 5000 mm, and preferably between 4300 and approximately 5000 mm, or advantageously between approximately 4500 and approximately 4800

mm.

 Generally also, the radius of curvature R2 may be between approximately 200 and approximately 1700 mm, and preferably between approximately 600 and approximately 1300 mm, or advantageously between approximately 900 and approximately 1000 mm.

 The radius R4 can for its part be between approximately 200 and approximately 1700 mm, or between approximately 225 and approximately 600 mm, or advantageously between approximately 250 and approximately 350 mm.

 The radius R5 can for its part be between approximately 100 and approximately 1500 mm, or between approximately 125 and approximately 800 mm, or between approximately 150 and approximately 350 mm.

 Generally also, the radius R can be between approximately 8 and approximately 16 mm or preferably between approximately 10 and approximately 14 mm or advantageously between approximately 12 and approximately 13 mm.

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 The above principles can be applied to cans of general polyhedral shapes other than parallelepipedic.

Claims (25)

1. Can (1) of generally polyhedral shape and of the type comprising a side wall belt (2,3), a bottom wall (4) and an upper wall (5) which close the side wall belt, and regions d 'edges (6, 7) along which the side walls, lower and upper are connected together, characterized in that at least two first opposite side walls (2,3) each comprise a central convex region (10) spaced from lower (4) and upper (5) walls, this central region having a first radius of curvature (R1, R3), in a first plane (P1, P3) median and orthogonal to the central region (10) and intended to be substantially vertical when the container rests by its lower wall (4) on a horizontal surface, and a second radius of curvature (R2, R4), in a second plane (P2, P4) median orthogonal to the central region (10) and intended to be substantially horizontal when the container rests by its lower wall (4) on a horizontal surface.  2. Can according to claim 1, characterized in that the first radius of curvature (R1, R3) is between about 4000 and about 5500 mm.  3. Can according to claim 2, characterized in that the first radius of curvature (R1, R3) is between about 4300 and about 5000 mm.  4. Can according to claim 3, characterized in that the first radius of curvature (R1, R3) is between about 4500 and about 4800 mm.  5. Can according to one of the preceding claims, characterized in that the second radius of curvature (R2, R4) is between approximately 200 and approximately 1700 mm.  6. Can according to claim 5, characterized in that the first two side walls (2) have lateral dimensions greater than those of the other side walls (3), and in that the second radius of curvature (R2) is between about 600 and about 1300 mm.  7. Can according to claim 6, characterized in that the second radius of curvature (R2) is between about 900 and about 1000 mm. <Desc / Clms Page number 14>  8. Can according to claim 5, characterized in that the first two side walls (3) have lateral dimensions smaller than those of the other side walls (2), and in that the second radius of curvature (R4) is between about 225 and about 600 mm.  9. Can according to claim 8, characterized in that the second radius of curvature (R4) is between about 250 and about 350 mm.  10. Can according to one of the preceding claims, characterized in that all the side walls (2,3) each comprise a central convex region (10) spaced from the lower (4) and upper (5) walls, this central convex region having a first radius of curvature (R1), in a first plane (P1, P3) median orthogonal to the central region (10) and intended to be vertical when the container rests by its lower wall (4) on a horizontal surface, and a second radius of curvature (R2, R4), in a second plane (P2, P4) median orthogonal to the central region (10) and intended to be horizontal when the container rests by its lower wall (4) on a horizontal surface.  11. Can according to one of the preceding claims, characterized in that the edge regions (7) connecting at least two opposite side walls (2,3) to the bottom wall (4) and / or to the top wall ( 5) are convex and have, in planes (P1, P3) orthogonal to these edge regions (7) and intended to be vertical when the container rests by its lower wall (4) on a horizontal surface, a third radius of curvature (R) between about 8 and about 16 mm.  12. Can according to claim 11, characterized in that the third radius of curvature (R) is between about 10 and about 14 mm.  13. Can according to claim 12, characterized in that the third radius of curvature (R) is between about 12 and about 13 mm.  14. Can according to one of the preceding claims, characterized in that at least two opposite side walls (2) each comprise at least one reinforcement region (14,16) projecting outwards, the reinforcement regions ( 14,16) extending substantially from the bottom wall (4) to the top wall (5) or from the top wall (5) to the bottom wall (4). <Desc / CRUD Page number 15>  15. Can according to claim 14, characterized in that at least two opposite side walls (2) each comprise two reinforcement regions (14,16) projecting outwards, including a first lower reinforcement region (14) extends from the bottom wall (4) to the top wall (5) and a second upper reinforcement region (16) extends from the top wall (5) to the bottom wall (4).  16. Can according to claim 14 or 15, characterized in that each reinforcement region (14,16) is spaced laterally from the edge regions (6) connecting the side wall (2,3) to which it belongs to the side walls (2,3) adjacent.  17. Can according to one of the preceding claims, characterized in that the reinforcement regions (14,16) are formed by bulges of the side walls (2,3) to which they belong.  18. Can according to one of the preceding claims, characterized in that at least one edge region (6) connecting two adjacent side walls (2, 3) comprises at least one convex lower section (31) or an upper section convex (32) having, in a plane substantially orthogonal to said edge region (6) and intended to be substantially vertical when the container rests by its lower wall (4) on a horizontal surface, an additional radius of curvature (R5) between approximately 100 and approximately 1500 mm.  19. Can according to claim 18, characterized in that said edge region (6) comprises a convex lower section (31) and a convex upper section (32) each having, in a plane substantially orthogonal to said edge region (6) and intended to be substantially vertical when the container rests by its lower wall (4) on a horizontal surface, an additional radius of curvature (R5) of between approximately 100 and approximately 1500 mm.  20. Can according to claim 18 or 19, characterized in that the or each additional radius of curvature (R5) is between approximately 125 and approximately 800 mm.  21. Can according to claim 20, characterized in that the or each additional radius of curvature (R5) is between approximately 150 and approximately 350 mm. <Desc / Clms Page number 16>  22. Can according to one of claims 18 to 21, characterized in that said or each of said convex section (s) (31, 32) of said edge region (6) extends towards the upper wall (5) from a lower vertex (8) connecting said two adjacent side walls (2,3) to the lower wall (4), or extends towards the lower wall (4) from an upper vertex (9) connecting said two side walls adjacent (2,3) to the upper wall (5).  23. Can according to one of the preceding claims, characterized in that it is of generally parallelepiped shape.  24. Can according to one of the preceding claims, characterized in that it is made of plastic.  25. Can according to claim 24, characterized in that it was obtained by extrusion blow molding.