EP2512940B1 - Integral metal lid having parallelogram-shaped predetermined break-off line - Google Patents

Integral metal lid having parallelogram-shaped predetermined break-off line Download PDF

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Publication number
EP2512940B1
EP2512940B1 EP10807620.9A EP10807620A EP2512940B1 EP 2512940 B1 EP2512940 B1 EP 2512940B1 EP 10807620 A EP10807620 A EP 10807620A EP 2512940 B1 EP2512940 B1 EP 2512940B1
Authority
EP
European Patent Office
Prior art keywords
line
break
transverse
transverse section
lid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10807620.9A
Other languages
German (de)
French (fr)
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EP2512940A1 (en
Inventor
Jean-Marc Legresy
Patrick Oudart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trivium Packaging Group Netherlands BV
Original Assignee
Ardagh MP Group Netherlands BV
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Publication date
Application filed by Ardagh MP Group Netherlands BV filed Critical Ardagh MP Group Netherlands BV
Priority to PL10807620T priority Critical patent/PL2512940T3/en
Publication of EP2512940A1 publication Critical patent/EP2512940A1/en
Application granted granted Critical
Publication of EP2512940B1 publication Critical patent/EP2512940B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/404—Details of the lines of weakness
    • 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
    • B65D17/4011—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening completely by means of a tearing tab
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/001—Action for opening container
    • B65D2517/0016—Action for opening container pivot tab, push-down and pull-out tear panel

Definitions

  • the present invention relates to metal lids for containers, in particular metal containers of the type can. It relates more particularly to one-piece covers comprising (i) a peripheral portion for its assembly on the container body and (ii) a central shutter panel portion comprising a removable portion by tearing a breaking initiation line.
  • Some metal containers mainly cans for food packaging, are often equipped with a lid with an "easy" opening system, avoiding the use of a can opener.
  • a particularly interesting solution consists of a one-piece metal cover having a peripheral portion associated with a central panel provided with a portion or removable portion.
  • this removable portion is, on the one hand, delimited by a peripheral rupture initiation line, and on the other hand, equipped with a gripping and traction member, commonly called "opening ring”.
  • This gripping member conventionally comprises two parts or zones extending along its longitudinal axis: a peripheral part comprising a "nose” fixed to the removable portion of the central panel, close to the breaking initiation line, and a loop-shaped inner part which, before its traction operation for the opening, is pressed against the upper surface of this removable portion.
  • the user grasps the gripping member, generally by its free inner area, and then away from the central panel.
  • the gripping member then forms a lever, the beak-shaped peripheral end of which causes a local break of the breaking initiation line over a small part of its length, called the "initial rupture zone".
  • the removable portion of the panel is then folded locally inward, along a fold line oriented perpendicularly, or approximately perpendicularly, with respect to the longitudinal axis of the gripping member.
  • the user exerts traction on the gripping member, so as to continue tearing the tear initiation line and dissociate the removable portion relative to the lid.
  • the gripping member therefore allows the transmission of the force applied by the user, and the energy generated, to the removable portion of the central panel, so as to ensure the tearing of the metal along the peripheral rupture initiation line.
  • the ease of opening is defined by the level of force and energy required to break this breakaway line.
  • This phenomenon can come from a poor efficiency in the transmission of the force and traction energy exerted by the user.
  • lids comprising a general parallelogram-shaped rupture initiation line (square or rectangular shape with rounded corners, viewed from above), consisting of rectilinear sections marrying the peripheral assembly part to ensure optimum and maximum opening of the lid.
  • US-2006/0042982 discloses a container equipped with a metal lid provided with a breaking initiation line consisting of four rectilinear sections arranged lozenge. One of the angles of this breaking initiation line is equipped with the opening ring.
  • Such a container has the advantage of offering some reduction in the effort to open, but no longer allows optimal access to the packaged product.
  • the first straight transverse section of the rupture initiation line makes it necessary to make a choice between (i) a reduction in the effort at opening but a reduced access to the packaged product. and (ii) optimal access to the packaged product but increased opening effort.
  • lids of this type to reduce the level of force and energy required for opening (good feeling of opening), while maintaining a maximum opening percentage to maintain easy access to the packaged product.
  • EP 0 061 980 A1 discloses a container equipped with a metal lid according to the preamble of claim 1.
  • the present invention therefore aims to meet this need.
  • the object concerned by the invention is a metal cover according to claim 1.
  • the downstream portion of the first transverse section of the breaking initiation line comprises, on the side of the upstream portion, a portion of length, advantageously in the general shape of a circular arc, whose angle ⁇ exterior evolves, preferably progressively or at least approximately gradually, from an initial value between 46 ° and 49 °, to a final value of the order of 67 ° to 68 °.
  • the downstream portion of the first transverse section of the breaking initiation line is of generally curved shape; in this case, this downstream portion is advantageously constituted by a succession of radii and / or straight segments.
  • the peripheral portion of the lid is also in the general shape of a parallelogram, composed of two longitudinal edges and two transverse edges; and the rupture initiation line extends along said lid peripheral portion.
  • the present invention further relates to a container, in particular of the kind metal tin can, equipped with a metal lid as detailed above.
  • the lid 1, as shown on the figure 1 is intended to be assembled with the upper edge of a metal container body (not shown) of generally parallelepipedal shape with rounded corners.
  • This lid 1, and the associated metal container body are intended to form a tin generally in parallelepiped shape, often referred to as "club box”.
  • the container body 1 usually consists of a side wall belt (generally square or rectangular section) whose bottom edge is extended by a bottom member.
  • connection between this lid 1 and the container body is performed by an assembly technique chosen by those skilled in the art, for example by a crimping technique.
  • the lid 1 according to the invention consists of a one-piece metal part, advantageously manufactured by a stamping technique from a sheet of metal material of the aluminum, steel, etc. type.
  • This lid 1 has, seen from above, a general shape of parallelogram, in this case a generally rectangular shape with rounded corners.
  • the peripheral ring 2 of generally rectangular shape, comprises two longitudinal edges 2 to 1 and 2 to 2 opposite, connected by two transverse edges 2 b 1 and 2 b 2 opposite.
  • This ring 2 advantageously comprises a molding allowing its assembly by crimping on the container body.
  • the central closure panel 3 is also of generally rectangular overall shape with a longitudinal axis of symmetry 3 ', oriented parallel to the longitudinal edges 2a of the peripheral ring 2.
  • This shutter panel 3 is provided with a breaking initiation line 4, also called “incision line”, which delimits a central portion 5 equipped with a gripping member 7.
  • this central portion 5 then constitutes a removable portion or portion, by breaking the breaking initiation line 4.
  • the breaking initiation line 4 (hereinafter referred to as "incision line” for the sake of simplification) is also of generally rectangular overall shape, seen from above.
  • This incision line 4 is made by a thinning of the material, obtained by the implementation of a suitable tool during the manufacture of the lid.
  • the incision line 4 is here closed, or in other words complete, that is to say that it extends all around the removable part 5; alternatively, it could be only partial.
  • This line of incision 4 extends in this case along and near the peripheral ring 2; it comprises in this case two longitudinal sections 4 to 1 and 4 to 2 opposite (arranged along the longitudinal edges 2 to 1 and 2 to 2 of the ring 2), connected at their ends by two transverse sections 4 b 1 and 4 b 2 (on the side of the two transverse edges 2 b 1 and 2 b 2 of the ring 2).
  • the two longitudinal sections 4 to 1 and 4 to 2 facing here are rectilinear.
  • the two transverse sections 4 b 1 and 4 b 2 opposite have each in turn a generally curved shape to improve the level of force and energy required for opening the lid, as developed below.
  • the removable portion 5 is equipped, at its upper surface, the gripping member 7 whose manipulation by the user will allow easy opening of the lid 1 (that is to say, a separation, total or partial of the removable portion 5 relative to the remainder of the cover 1 by tearing the incision line 4).
  • this manipulation of the gripping member 7 conventionally comprises two steps: a first step of initiating tearing of the incision line 4, by manual pivoting / tilting of the gripping member 7, and a step of continuing the tearing of the rupture line 4, by manual pulling on this member 7.
  • the gripping member 7 is known to those skilled in the art under the name of "opening ring”.
  • the opening ring 7 is shown schematically here. It is set here at a junction angle 4c of the incision line 4 formed by the junction between a first transverse section 4 b 1 and a first longitudinal member 4 has two of said break line 4.
  • This junction angle c 4 will form a break zone or initial tearing of the incision line 4 appearing during initial pivoting of the opening ring 7.
  • upstream portions 4 b 11 and 4 to 21, on the one hand, and downstream b 4 12 and 4 22, on the other hand, are here separated by a line designated by the marker 8 on the figure 1 .
  • this separation line 8 extends perpendicular to the longitudinal axis 7 'of the gripping member 7, and corresponds at least approximately to the fold line of the removable portion 5 following the initial pivoting of this gripping member 7.
  • the downstream portion 4b 12 of the first transverse portion 4b 1 of the incision line 4 is shaped so that, along its length, its tangents 9 (only one of these tangents is drawn on the figure 1 by way of illustration) define an outside angle ⁇ greater than 45 °, with the line 8 perpendicular to the longitudinal axis 7 'of the gripping member 7.
  • exital angle ⁇ we mean more precisely the hour angle defined on the figure 1 between, on one hand, the tangent 9 to the downstream portion 4b 12 of the first transverse portion 4b 1 of the incision line 4 and, secondly, the segment 8 to the perpendicular line 8, located the outside of the removable portion 5.
  • downstream portion 4b of the first transverse portion 12 4 b 1 is arranged again so that the outside angle ⁇ increases starting from the upstream portion 4 b 11 of said first transverse portion 4 b 1 and that the head of said second longitudinal section 4 to 1 associated.
  • the outside angle ⁇ is advantageously between 46 ° and 90 °.
  • the downstream portion 4b of the first transverse portion 12 4 b 1 is advantageously curved.
  • the radius of the first part is significantly greater than the radius of the second part.
  • This downstream portion 4b of the first transverse portion 12 4 b 1 thus advantageously an inner convex curvature (curvature continuously oriented inward).
  • the first part in an elliptical arc, corresponds to approximately between 2/3 and 3/4 of the length of the first transverse section 4 b 1.
  • the second part in an arc, constitutes the remaining length of said first transverse section 4 b 1, ie between 1/3 and 1/4 of the length of said first transverse section 4 b 1.
  • the downstream portion 12 of the first 4 b 1 b 4 transverse section is composed of a plurality of spokes.
  • this downstream portion 4 b 12 comprises here radii between 15 and 100 mm.
  • the upper portion 4 b 11 of said first transverse portion 4b 1 already forms an angle ⁇ at its end facing the downstream portion 4b next 12.
  • the angle defined by the tangent 9 to the downstream portion 4b of the first transverse portion 12 4 b 1 and the longitudinal axis 7 'of the gripper 7, has a value that remains below 45 ° (This angle is anti-clockwise on figures 1 and 2 ).
  • this angle ⁇ is illustrated by the successive angles ⁇ 1 to ⁇ 10 on the figure 2 spaced two by two by 3 mm, and respectively have the following values of the order of 1.5 °, 3 °, 6 °, 9 °, 11 °, 14 °, 16 °, 22 °, 31 ° and 42 ° °.
  • This angle ⁇ thus progresses to a value of the order of 90 ° at the second longitudinal section 4 to 1.
  • downstream portion 4b 12 could be constituted by a succession of straight segments or a combination of curved and straight lines segments.
  • these segments each have a length of the order of 5 mm.
  • first transverse portion 4b 1 of the incision line 4 is formed close to the connection ring 2 so that the distance d between said first transverse portion 4b 1 and the transverse edge facing 2 b 1 of this ring 2 is between 1 and 15 mm, and more preferably between 1 and 10 mm.
  • the "distance d" corresponds to the length of the line segment on the one hand, extending perpendicularly to the tangent 9 of the downstream portion 4b of the first transverse portion 12 b 1 and 4, on the other hand , defined by said downstream portion 4 b 12 and the transverse edge facing 2 1 b of the ring 2.
  • the distance gradually increases along the downstream portion 4b of the first transverse portion 12 4 b 1, from a distance of the order of 0.6 to 2 mm, up to a maximum distance from the order of 15 mm, preferably between 5 and 10 mm.
  • This distance d makes it possible to maintain a maximum opening of the lid 1, and to limit the distance of the strip of residual material after detachment of the removable part 5. This gives an optimal compromise between the return of the product and the ease of opening.
  • downstream portion 4 to 22 of the first longitudinal section 4 to 2 here defines an external angle ⁇ of the order of 45 ° with the aforementioned line 8 perpendicular to the longitudinal axis 7 'of the grasping member 7.
  • exital angle ⁇ is meant more precisely the anti-clockwise angle defined on the figure 1 between, on the one hand, the downstream portion 4 to 22 of the first longitudinal section 4 to 2 of the incision line 4 and, on the other hand, the segment 8b of the separation line 8, located on the outside of the incision line 4.
  • the second transverse section 4 b 2 is also generally curved, here in the general shape of a circular arc.
  • this second transverse section 4 b 2 could consist of a succession of rays or a plurality of straight segments.
  • this second transverse portion 4 b 2 is provided near the second transverse edge 2 b 2 facing the ring 2, so that the distance e between the two sections 4 b 2 and 2 b 2 is advantageously between 1 and 15 mm, and preferably between 1 and 10 mm.
  • this particular distance makes it possible to limit the bulk of the material strip of the remaining central panel 3 after the removal of the removable portion 5 of the cover 1.
  • the opening ring 7 allows the user to exert traction on the detachable portion 5, so as to break the incision line 4 from the initial fracture zone 4 c (adjoining the organ gripping 7) to a distal region or downstream at the opposite of said opening ring 7.
  • This distal zone corresponds here to the second transverse portion 4B 2 of the incision line 4.
  • the maneuvering of the ring 7 is implemented in two distinct times, to ensure the opening of the lid 1.
  • the user grasps the free portion 7b of the gripping member 7, so as to move away from the detachable portion 5.
  • the gripping member then forms a lever, rotated by the user; this causes, on one hand, a local breakage of the incision line 4 at its initial breaking zone 4c and, secondly, the local folding inwardly a portion of the detachable panel 5 along the line of separation 8 (which extends perpendicularly to the longitudinal axis 7 'of the gripping member 7).
  • the upstream portion 4 b 11 of the first transverse portion 4b 1 and the upstream portion 4 to 21 of the first longitudinal member 4 2 of the incision line 4 are torn.
  • the separation of the detachable portion 5 continues with a second step in which the user exerts a pull on the gripping member 7, so as to continue the tearing of the incision line 4.
  • the opening ring 7 progresses at least approximately along the length and facing a general traction line.
  • This pulling line is illustrated on the figure 1 by a broken line 11 corresponding to its projection on the central panel 3; this pulling line 11 extends between the initial fracture zone 4c and the second transverse portion 4B 2 of the incision line 4.
  • the traction is initiated by the operator in a direction oriented along the longitudinal axis 7 'of the gripping member 7, corresponding to the proximal portion 11a of the traction line 11 .
  • the efficiency of the force and traction energy applied by the user, to initiate the tearing of the incision line 4 during this traction step, is significantly improved compared with conventional lids, thanks to the particular conformation of the downstream portion 4b 12 of the first transverse portion 4b 1.
  • the traction on the gripping member 7 is continued in a conventional manner along a distal portion 11b of the traction line 11, so as to tear the incision line 4 towards the second section transversal 4 b 2.
  • the final tear of the second transverse section 4 b 2 of the incision line 4 will be facilitated by its particular curved shape, which also aims to optimize the efficiency of the force and the traction energy.
  • This particular structure makes it possible to limit the spring effect phenomenon often observed on the detached portion 5.
  • the assembly ring 2 of the lid 1 could have any other shape, seen from above, adapted to the section of the receiving body (for example oval, circular or polygonal).
  • the lid according to the invention has the advantage of having a good opening feeling and an improved recovery value, while maintaining a maximum opening area.

Description

La présente invention concerne les couvercles métalliques pour contenants, en particulier les contenants métalliques du genre boîte de conserve. Elle concerne plus particulièrement les couvercles monoblocs comportant (i) une partie périphérique pour son assemblage sur le corps de contenant et (ii) une partie formant panneau central d'obturation comprenant une partie amovible par déchirage d'une ligne d'amorce de rupture.The present invention relates to metal lids for containers, in particular metal containers of the type can. It relates more particularly to one-piece covers comprising (i) a peripheral portion for its assembly on the container body and (ii) a central shutter panel portion comprising a removable portion by tearing a breaking initiation line.

Certains contenants métalliques, principalement les boîtes de conserve pour le conditionnement de denrées alimentaires, sont souvent équipés d'un couvercle muni d'un système d'ouverture « facile », évitant l'utilisation d'un outil du type ouvre-boîtes.Some metal containers, mainly cans for food packaging, are often equipped with a lid with an "easy" opening system, avoiding the use of a can opener.

Une solution particulièrement intéressante consiste en un couvercle métallique monobloc comportant une partie périphérique associée à un panneau central muni d'une portion ou partie amovible. Pour cela, cette portion amovible est, d'une part, délimitée par une ligne d'amorce de rupture périphérique, et d'autre part, équipée d'un organe de préhension et de traction, couramment dénommé « anneau d'ouverture ».A particularly interesting solution consists of a one-piece metal cover having a peripheral portion associated with a central panel provided with a portion or removable portion. For this, this removable portion is, on the one hand, delimited by a peripheral rupture initiation line, and on the other hand, equipped with a gripping and traction member, commonly called "opening ring".

Cet organe de préhension comprend classiquement deux parties ou zones s'étendant le long de son axe longitudinal : - une partie périphérique comportant un « bec », fixée à la portion amovible du panneau central, à proximité de la ligne d'amorce de rupture, et - une partie intérieure en forme de boucle qui, avant sa manoeuvre par traction pour l'ouverture, est plaquée contre la surface supérieure de cette portion amovible.This gripping member conventionally comprises two parts or zones extending along its longitudinal axis: a peripheral part comprising a "nose" fixed to the removable portion of the central panel, close to the breaking initiation line, and a loop-shaped inner part which, before its traction operation for the opening, is pressed against the upper surface of this removable portion.

En général, pour ouvrir un tel couvercle, l'utilisateur est amené à manoeuvrer l'organe de préhension selon deux opérations successives et distinctes.In general, to open such a lid, the user is made to maneuver the gripping member in two successive and distinct operations.

Tout d'abord, dans une première étape d'amorce de l'ouverture, l'utilisateur saisit l'organe de préhension, en général par sa zone intérieure libre, puis il l'écarte du panneau central.First, in a first step of initiating the opening, the user grasps the gripping member, generally by its free inner area, and then away from the central panel.

L'organe de préhension forme alors un levier, dont l'extrémité périphérique en forme de bec provoque une cassure locale de la ligne d'amorce de rupture sur une petite partie de sa longueur, dite « zone de rupture initiale ». La portion amovible du panneau est alors pliée localement vers l'intérieur, selon une ligne de pliage orientée perpendiculairement, ou approximativement perpendiculairement, par rapport à l'axe longitudinal de l'organe de préhension.The gripping member then forms a lever, the beak-shaped peripheral end of which causes a local break of the breaking initiation line over a small part of its length, called the "initial rupture zone". The removable portion of the panel is then folded locally inward, along a fold line oriented perpendicularly, or approximately perpendicularly, with respect to the longitudinal axis of the gripping member.

Dans une seconde étape de l'ouverture, l'utilisateur exerce une traction sur l'organe de préhension, de sorte à poursuivre la déchirure de la ligne d'amorce de rupture et dissocier la portion amovible par rapport au couvercle.In a second step of the opening, the user exerts traction on the gripping member, so as to continue tearing the tear initiation line and dissociate the removable portion relative to the lid.

L'organe de préhension permet donc la transmission de la force appliquée par l'utilisateur, et de l'énergie générée, vers la portion amovible du panneau central, de sorte à assurer la déchirure du métal le long de la ligne d'amorce de rupture périphérique.The gripping member therefore allows the transmission of the force applied by the user, and the energy generated, to the removable portion of the central panel, so as to ensure the tearing of the metal along the peripheral rupture initiation line.

La facilité de l'ouverture est définie par le niveau de force et d'énergie requis pour rompre cette ligne d'amorce de rupture.The ease of opening is defined by the level of force and energy required to break this breakaway line.

Et il est bien connu qu'un niveau de force et d'énergie réduit à l'ouverture constitue un élément important pour les utilisateurs manipulant une telle boîte de conserve.And it is well known that a reduced level of force and energy at the opening is an important element for users handling such a can.

Or, encore à ce jour, certains couvercles, équipés d'un organe de préhension et de traction nécessitent un niveau de force et d'énergie relativement élevé pour assurer leur ouverture.However, still to date, some lids, equipped with a gripping member and traction require a relatively high level of force and energy to ensure their opening.

Ce phénomène peut provenir d'un mauvais rendement dans la transmission de la force et de l'énergie de traction exercées par l'utilisateur.This phenomenon can come from a poor efficiency in the transmission of the force and traction energy exerted by the user.

C'est en particulier le cas des couvercles comportant une ligne d'amorce de rupture en forme générale de parallélogramme (forme carrée ou rectangulaire avec coins arrondis, vue par dessus), constituée de tronçons rectilignes épousant la partie périphérique d'assemblage pour assurer une ouverture optimale et maximale du couvercle.This is particularly the case of the lids comprising a general parallelogram-shaped rupture initiation line (square or rectangular shape with rounded corners, viewed from above), consisting of rectilinear sections marrying the peripheral assembly part to ensure optimum and maximum opening of the lid.

Il s'avère qu'une telle ligne de rupture nécessite normalement un niveau de force et d'énergie relativement important, notamment à l'amorçage de l'étape de déchirure par traction.It turns out that such a breaking line normally requires a relatively high level of force and energy, especially at the initiation of the tensile tearing step.

Le document US-A-2006/0042982 décrit un contenant équipé d'un couvercle métallique muni d'une ligne d'amorce de rupture constituée de quatre tronçons rectilignes agencés en losange. L'un des angles de cette ligne d'amorce de rupture est équipé de l'anneau d'ouverture.The document US-2006/0042982 discloses a container equipped with a metal lid provided with a breaking initiation line consisting of four rectilinear sections arranged lozenge. One of the angles of this breaking initiation line is equipped with the opening ring.

Un tel contenant a l'intérêt d'offrir une certaine réduction de l'effort à l'ouverture, mais ne permet plus un accès optimal au produit conditionné.Such a container has the advantage of offering some reduction in the effort to open, but no longer allows optimal access to the packaged product.

Ainsi, dans les contenants de l'art antérieur, le premier tronçon transversal rectiligne de la ligne d'amorce de rupture oblige à faire un choix entre (i) une réduction de l'effort à l'ouverture mais un accès réduit au produit conditionné et (ii) l'accès optimal au produit conditionné mais un effort à l'ouverture accru.Thus, in the containers of the prior art, the first straight transverse section of the rupture initiation line makes it necessary to make a choice between (i) a reduction in the effort at opening but a reduced access to the packaged product. and (ii) optimal access to the packaged product but increased opening effort.

Il existe ainsi un besoin, pour des couvercles de ce type, de réduire le niveau de force et d'énergie nécessaire à l'ouverture (bonne sensation d'ouverture), tout en conservant un pourcentage d'ouverture maximal pour maintenir un accès aisé au produit conditionné.There is thus a need, for lids of this type, to reduce the level of force and energy required for opening (good feeling of opening), while maintaining a maximum opening percentage to maintain easy access to the packaged product.

EP 0 061 980 A1 divulgue un contenant équipé d'un couvercle métallique selon le préambule de la revendication 1. EP 0 061 980 A1 discloses a container equipped with a metal lid according to the preamble of claim 1.

La présente invention a donc pour objectif de répondre à ce besoin.The present invention therefore aims to meet this need.

Ainsi, l'objet concerné par l'invention est un couvercle métallique selon la revendication 1.Thus, the object concerned by the invention is a metal cover according to claim 1.

Le demandeur démontre que cette conformation de la ligne d'amorce de rupture apporte une réduction significative du niveau de force et d'énergie nécessaire à l'ouverture, par un meilleur rendement de transmission d'effort et d'énergie sur la ligne d'amorce de rupture (en particulier au début de la seconde étape d'ouverture par traction sur l'anneau), tout en permettant de préserver un large accès au produit conditionné (sans zones difficiles d'accès et/ou cachées sous la matière restant du couvercle après ouverture).The applicant demonstrates that this conformation of the line of initiation of rupture brings a significant reduction of the level of force and energy necessary for the opening, by a better efficiency of transmission of effort and energy on the line of fracture initiation (especially at the beginning of the second step of opening by traction on the ring), while allowing to preserve a wide access to the packaged product (without areas difficult to access and / or hidden under the remaining material of the lid after opening).

Selon un mode de réalisation particulier, la portion aval du premier tronçon transversal de la ligne d'amorce de rupture comporte, du côté de la portion amont, une partie de longueur, avantageusement en forme générale d'arc de cercle, dont l'angle extérieur α évolue, avantageusement progressivement ou au moins approximativement progressivement, depuis une valeur initiale comprise entre 46° et 49°, jusqu'à une valeur finale de l'ordre de 67° à 68°.According to a particular embodiment, the downstream portion of the first transverse section of the breaking initiation line comprises, on the side of the upstream portion, a portion of length, advantageously in the general shape of a circular arc, whose angle α exterior evolves, preferably progressively or at least approximately gradually, from an initial value between 46 ° and 49 °, to a final value of the order of 67 ° to 68 °.

Selon une autre caractéristique de l'invention, la portion aval du premier tronçon transversal de la ligne d'amorce de rupture est de forme générale courbe ; dans ce cas, cette portion aval est avantageusement constituée d'une succession de rayons et/ou de segments de droite.According to another characteristic of the invention, the downstream portion of the first transverse section of the breaking initiation line is of generally curved shape; in this case, this downstream portion is advantageously constituted by a succession of radii and / or straight segments.

Selon un mode particulier de réalisation, la partie périphérique du couvercle est également en forme générale de parallélogramme, composé de deux bordures longitudinales et de deux bordures transversales ; et la ligne d'amorce de rupture s'étend le long de ladite partie périphérique de couvercle.According to a particular embodiment, the peripheral portion of the lid is also in the general shape of a parallelogram, composed of two longitudinal edges and two transverse edges; and the rupture initiation line extends along said lid peripheral portion.

Dans ce cadre :

  • le premier tronçon transversal de la ligne d'amorce de rupture est avantageusement agencé à proximité d'une première bordure transversale de la partie périphérique de couvercle, de telle sorte que la distance entre ledit premier tronçon transversal de la ligne d'amorce de rupture et ladite première bordure transversale de la partie périphérique est comprise entre 1 et 15 mm, et de préférence entre 1 et 10 mm ;
  • le second tronçon transversal de la ligne d'amorce de rupture est avantageusement de forme courbe, adaptée pour réduire également le niveau de force et d'énergie nécessaire à la séparation finale entre la portion détachable et le reste du couvercle métallique, de sorte en particulier à réduire le phénomène d'effet ressort ; dans ce cas, ce second tronçon transversal de la ligne d'amorce de rupture est avantageusement constitué d'une ligne en arc de cercle, de plusieurs rayons ou d'une succession de segments de droite ou d'une combinaison de tels éléments ; encore dans ce cas, le second tronçon transversal de la ligne d'amorce de rupture est agencé avantageusement à proximité d'une seconde bordure transversale de la partie périphérique du couvercle, de telle sorte que la distance entre ledit second tronçon transversal de la ligne d'amorce de rupture et ladite seconde bordure transversale en regard de la partie périphérique est comprise entre 1 et 15 mm, et de préférence entre 1 et 10 mm.
In this context:
  • the first transverse section of the breaking initiation line is advantageously arranged close to a first transversal edge of the peripheral portion of the cover, such that the distance between said first transverse section of the rupture initiation line and said first transverse edge of the peripheral portion is between 1 and 15 mm, and preferably between 1 and 10 mm;
  • the second transverse section of the breaking initiation line is advantageously of curved shape, adapted to also reduce the level of force and energy required for the final separation between the detachable portion and the remainder of the metal cover, so in particular to reduce the phenomenon of spring effect; in this case, this second transverse section of the breaking initiation line is advantageously constituted by a line in the form of an arc of a circle, a plurality of radii or a succession of line segments or a combination of such elements; again in this case, the second transverse section of the breaking initiation line is advantageously arranged near a second transversal edge of the peripheral part of the lid, so that the distance between said second transverse section of the line of the rupture primer and said second transverse edge facing the peripheral portion is between 1 and 15 mm, and preferably between 1 and 10 mm.

La présente invention concerne encore un contenant, en particulier du genre boîte de conserve métallique, équipé d'un couvercle métallique tel que détaillé ci-dessus.The present invention further relates to a container, in particular of the kind metal tin can, equipped with a metal lid as detailed above.

L'invention va maintenant être illustrée, sans être aucunement limitée, par la description suivante d'un mode de réalisation particulier, en relation avec les dessins annexés dans lesquels :

  • la figure 1 est une vue générale de dessus d'un couvercle monobloc selon l'invention, avec organe de préhension ;
  • la figure 2 est une vue agrandie et partielle du couvercle de la figure 1, du côté de l'organe de préhension (non représenté par souci de simplification).
The invention will now be illustrated, without being limited in any way, by the following description of a particular embodiment, with reference to the accompanying drawings in which:
  • the figure 1 is a general view from above of a one-piece cover according to the invention, with a gripping member;
  • the figure 2 is an enlarged and partial view of the lid of the figure 1 on the side of the gripping member (not shown for the sake of simplicity).

Le couvercle 1, tel que représenté sur la figure 1, est destiné à être assemblé avec la bordure supérieure d'un corps de contenant métallique (non représenté) de forme générale parallélépipédique avec coins arrondis.
Ce couvercle 1, et le corps de contenant métallique associé, sont destinés à former une boîte de conserve en général de forme parallélépipédique, souvent dénommée « boîte club ».The lid 1, as shown on the figure 1 , is intended to be assembled with the upper edge of a metal container body (not shown) of generally parallelepipedal shape with rounded corners.
This lid 1, and the associated metal container body, are intended to form a tin generally in parallelepiped shape, often referred to as "club box".

Le corps de contenant 1 se compose habituellement d'une ceinture de parois latérales (à section globalement carrée ou rectangulaire) dont la bordure inférieure est prolongée par un élément de fond.The container body 1 usually consists of a side wall belt (generally square or rectangular section) whose bottom edge is extended by a bottom member.

La liaison entre ce couvercle 1 et le corps de contenant s'effectue par une technique d'assemblage choisie par l'homme du métier, par exemple par une technique de sertissage.The connection between this lid 1 and the container body is performed by an assembly technique chosen by those skilled in the art, for example by a crimping technique.

Le couvercle 1 selon l'invention consiste en une pièce métallique monobloc, avantageusement fabriquée par une technique d'emboutissage à partir d'une tôle en matériau métallique du type aluminium, acier, etc.The lid 1 according to the invention consists of a one-piece metal part, advantageously manufactured by a stamping technique from a sheet of metal material of the aluminum, steel, etc. type.

Ce couvercle 1 présente, vu de dessus, une forme générale de parallélogramme, en l'occurrence une forme générale rectangulaire avec coins arrondis.This lid 1 has, seen from above, a general shape of parallelogram, in this case a generally rectangular shape with rounded corners.

Il se compose, de manière bien connue de l'homme du métier, de deux parties qui ont globalement chacune une forme générale de parallélogramme :

  1. (i) une partie périphérique 2, formant une bague d'assemblage pour la fixation sur le corps d'un contenant, et
  2. (ii) une partie centrale 3, entourée par la partie périphérique 2 et formant un panneau central d'obturation.
It is composed, in a manner well known to those skilled in the art, of two parts which generally have each a general shape of parallelogram:
  1. (i) a peripheral portion 2, forming an assembly ring for attachment to the body of a container, and
  2. (ii) a central portion 3, surrounded by the peripheral portion 2 and forming a central shutter panel.

La bague périphérique 2, de forme globalement rectangulaire, comprend deux bordures longitudinales 2a1 et 2a2 en regard, reliées par deux bordures transversales 2b1 et 2b2 en regard.The peripheral ring 2, of generally rectangular shape, comprises two longitudinal edges 2 to 1 and 2 to 2 opposite, connected by two transverse edges 2 b 1 and 2 b 2 opposite.

Cette bague 2 comporte avantageusement une moulure permettant son assemblage par sertissage sur le corps de contenant.This ring 2 advantageously comprises a molding allowing its assembly by crimping on the container body.

Le panneau central d'obturation 3 est lui aussi de forme générale globalement rectangulaire, avec un axe longitudinal de symétrie 3', orienté parallèlement aux bordures longitudinales 2a de la bague périphérique 2.The central closure panel 3 is also of generally rectangular overall shape with a longitudinal axis of symmetry 3 ', oriented parallel to the longitudinal edges 2a of the peripheral ring 2.

Ce panneau d'obturation 3 est muni d'une ligne d'amorce de rupture 4, dénommée encore « ligne d'incision », qui délimite une partie centrale 5 équipée d'un organe de préhension 7.This shutter panel 3 is provided with a breaking initiation line 4, also called "incision line", which delimits a central portion 5 equipped with a gripping member 7.

Comme développé ci-après, cette partie centrale 5 constitue alors une partie ou portion amovible, par cassure de la ligne d'amorce de rupture 4.As developed hereinafter, this central portion 5 then constitutes a removable portion or portion, by breaking the breaking initiation line 4.

La ligne d'amorce de rupture 4 (dénommée par la suite « ligne d'incision » par souci de simplification) est également de forme générale globalement rectangulaire, vue de dessus.The breaking initiation line 4 (hereinafter referred to as "incision line" for the sake of simplification) is also of generally rectangular overall shape, seen from above.

Cette ligne d'incision 4 est réalisée par un amincissement de la matière, obtenu par la mise en oeuvre d'un outil adapté lors de la fabrication du couvercle.This incision line 4 is made by a thinning of the material, obtained by the implementation of a suitable tool during the manufacture of the lid.

La ligne d'incision 4 est ici fermée, ou autrement dit complète, c'est-à-dire qu'elle s'étend sur tout le pourtour de la partie amovible 5 ; de manière alternative, elle pourrait être uniquement partielle.The incision line 4 is here closed, or in other words complete, that is to say that it extends all around the removable part 5; alternatively, it could be only partial.

Cette ligne d'incision 4 s'étend en l'occurrence le long et à proximité de la bague périphérique 2 ; elle comprend en l'occurrence deux tronçons longitudinaux 4a1 et 4a2 en regard (agencés le long des bordures longitudinales 2a1 et 2a2 de la bague 2), reliés à leurs extrémités par deux tronçons transversaux 4b1 et 4b2 (du côté des deux bordures transversales 2b1 et 2b2 de la bague 2).This line of incision 4 extends in this case along and near the peripheral ring 2; it comprises in this case two longitudinal sections 4 to 1 and 4 to 2 opposite (arranged along the longitudinal edges 2 to 1 and 2 to 2 of the ring 2), connected at their ends by two transverse sections 4 b 1 and 4 b 2 (on the side of the two transverse edges 2 b 1 and 2 b 2 of the ring 2).

Les deux tronçons longitudinaux 4a1 et 4a2 en regard sont ici rectilignes. Les deux tronçons transversaux 4b1 et 4b2 en regard ont quant à eux chacun une forme générale courbe afin d'améliorer le niveau de force et d'énergie nécessaire à l'ouverture du couvercle, tel que développé ci-après.The two longitudinal sections 4 to 1 and 4 to 2 facing here are rectilinear. The two transverse sections 4 b 1 and 4 b 2 opposite have each in turn a generally curved shape to improve the level of force and energy required for opening the lid, as developed below.

La portion amovible 5 est équipée, au niveau de sa surface supérieure, de l'organe de préhension 7 dont la manipulation par l'utilisateur va permettre une ouverture facile du couvercle 1 (c'est-à-dire une désolidarisation, totale ou partielle de la portion amovible 5 par rapport au reste du couvercle 1 par déchirure de la ligne d'incision 4).The removable portion 5 is equipped, at its upper surface, the gripping member 7 whose manipulation by the user will allow easy opening of the lid 1 (that is to say, a separation, total or partial of the removable portion 5 relative to the remainder of the cover 1 by tearing the incision line 4).

Comme détaillé ci-après, cette manipulation de l'organe de préhension 7 comprend classiquement deux étapes : - une première étape d'amorce de déchirure de la ligne d'incision 4, par pivotement/basculement manuel de l'organe de préhension 7, et - une étape de poursuite de la déchirure de la ligne de rupture 4, par traction manuelle sur cet organe 7.As detailed below, this manipulation of the gripping member 7 conventionally comprises two steps: a first step of initiating tearing of the incision line 4, by manual pivoting / tilting of the gripping member 7, and a step of continuing the tearing of the rupture line 4, by manual pulling on this member 7.

L'organe de préhension 7 est connu de l'homme du métier sous l'appellation d'« anneau d'ouverture ».The gripping member 7 is known to those skilled in the art under the name of "opening ring".

L'anneau d'ouverture 7 est ici représenté de manière schématique. Il est fixé ici au niveau d'un angle de jonction 4c de la ligne d'incision 4, formé par la jonction entre un premier tronçon transversal 4b1 et un premier tronçon longitudinal 4a2 de ladite ligne de rupture 4.The opening ring 7 is shown schematically here. It is set here at a junction angle 4c of the incision line 4 formed by the junction between a first transverse section 4 b 1 and a first longitudinal member 4 has two of said break line 4.

Cet angle de jonction 4c va former une zone de cassure ou de déchirure initiale de la ligne d'incision 4, apparaissant lors du pivotement initial de l'anneau d'ouverture 7.This junction angle c 4 will form a break zone or initial tearing of the incision line 4 appearing during initial pivoting of the opening ring 7.

Cet anneau d'ouverture 7 comporte deux parties ou zones, agencées selon un axe longitudinal 7' orienté coaxialement à la bissectrice de la zone de déchirure initiale 4c, à savoir :

  1. (i) une partie périphérique 7a comportant un bec (non visible), fixée à la portion amovible 5, à proximité de la ligne d'incision 4, et
  2. (ii) une partie intérieure 7b en forme de boucle de préhension, qui est à l'origine plaquée contre la surface supérieure de la portion amovible 5.
This opening ring 7 comprises two parts or areas, arranged along a longitudinal axis 7 'aligned coaxially to the bisector of the initial tear region 4 c, namely:
  1. (i) a peripheral portion 7a having a spout (not visible) attached to the removable portion 5, close to the incision line 4, and
  2. (ii) an inner portion 7b in the form of a gripping loop, which is originally pressed against the upper surface of the removable portion 5.

Tenant compte de l'agencement de cet anneau d'ouverture 7 et de son pivotement initial lors de l'ouverture du couvercle, le premier tronçon transversal 4b1 et le premier tronçon longitudinal 4a2 de la ligne d'incision 4 comportent alors chacune deux portions :

  1. (i) une portion amont 4b11 et 4a21, destinée à être déchirée par l'opération initiale de pivotement de l'organe de préhension 7 (ces deux portions 4b11 et 4a21 définissent alors ensemble la zone de cassure initiale 4c de la ligne d'incision 4), et
  2. (ii) une portion aval 4b12 et 4a22, dans le prolongement de la zone de cassure initiale 4c, constituant la longueur restante des deux tronçons 4b1 et 4a2 correspondants, destinée à être déchirée par l'étape de traction sur l'organe de préhension 7.
Taking into account the arrangement of the opening ring 7 and its initial pivoting when the lid is opened, the first transverse portion 4b 1 and the first longitudinal member 4 2 of the incision line 4 then comprise each two portions:
  1. (i) an upstream portion 4 b 11 and 4 to 21, intended to be torn by the initial operation of pivoting of the gripper 7 (these two portions 4 and 4 b 11 21 then together define the break zone initial 4c of the incision line 4), and
  2. (ii) a downstream portion b 4 12 and 4 22, in the extension of the initial breaking zone 4c constituting the remaining length b of the two sections 4 1 and 4 2 corresponding intended to be torn by the step traction on the gripping member 7.

Ces portions amont 4b11 et 4a21, d'une part, et aval 4b12 et 4a22, d'autre part, sont ici séparées par une ligne désignée par le repère 8 sur la figure 1.
Comme développé par la suite, cette ligne de séparation 8 s'étend perpendiculairement à l'axe longitudinal 7' de l'organe de préhension 7, et correspond au moins approximativement à la ligne de pliage de la partie amovible 5 suite au pivotement initial de cet organe de préhension 7.These upstream portions 4 b 11 and 4 to 21, on the one hand, and downstream b 4 12 and 4 22, on the other hand, are here separated by a line designated by the marker 8 on the figure 1 .
As developed subsequently, this separation line 8 extends perpendicular to the longitudinal axis 7 'of the gripping member 7, and corresponds at least approximately to the fold line of the removable portion 5 following the initial pivoting of this gripping member 7.

Conformément à l'invention, pour améliorer le niveau de force et d'énergie nécessaires à l'initiation de l'étape de traction, la portion aval 4b12 du premier tronçon transversal 4b1 de la ligne d'incision 4 est conformée de telle sorte que, tout au long de sa longueur, ses tangentes 9 (seule l'une de ces tangentes est dessinée sur la figure 1 à titre d'illustration) définissent un angle extérieur α supérieur à 45°, avec la ligne 8 perpendiculaire à l'axe longitudinal 7' de l'organe de préhension 7.According to the invention, to improve the level of force and energy required for initiation of the pulling step, the downstream portion 4b 12 of the first transverse portion 4b 1 of the incision line 4 is shaped so that, along its length, its tangents 9 (only one of these tangents is drawn on the figure 1 by way of illustration) define an outside angle α greater than 45 °, with the line 8 perpendicular to the longitudinal axis 7 'of the gripping member 7.

Par « angle extérieur α », on entend plus précisément l'angle horaire défini sur la figure 1 entre, d'une part, les tangentes 9 à la portion aval 4b12 du premier tronçon transversal 4b1 de la ligne d'incision 4 et, d'autre part, le segment 8a de la ligne perpendiculaire 8, situé à l'extérieur de la portion amovible 5.By "external angle α", we mean more precisely the hour angle defined on the figure 1 between, on one hand, the tangent 9 to the downstream portion 4b 12 of the first transverse portion 4b 1 of the incision line 4 and, secondly, the segment 8 to the perpendicular line 8, located the outside of the removable portion 5.

En l'occurrence, cette portion aval 4b12 du premier tronçon transversal 4b1 est agencée encore de sorte que l'angle extérieur α augmente partant de la portion amont 4b11 dudit premier tronçon transversal 4b1 et cela en direction dudit second tronçon longitudinal 4a1 associé.In this case, the downstream portion 4b of the first transverse portion 12 4 b 1 is arranged again so that the outside angle α increases starting from the upstream portion 4 b 11 of said first transverse portion 4 b 1 and that the head of said second longitudinal section 4 to 1 associated.

De préférence encore, l'angle extérieur α est avantageusement compris entre 46° et 90°.More preferably, the outside angle α is advantageously between 46 ° and 90 °.

La portion aval 4b12 du premier tronçon transversal 4b1 est avantageusement courbe.The downstream portion 4b of the first transverse portion 12 4 b 1 is advantageously curved.

Selon la forme de réalisation illustrée, cette portion aval 4b12 du premier tronçon transversal 4b1 peut être divisée en deux parties :

  • une première partie en forme générale d'arc d'ellipse ou d'arc de cercle, du côté de la portion amont 4b11, dont l'angle extérieur α évolue progressivement, ou au moins quasi-progressivement, depuis une valeur initiale comprise entre 46° et 49°, jusqu'à une valeur finale de l'ordre de 67° à 68°, et
  • une seconde partie en forme générale d'arc de cercle, pour le raccordement avec le second tronçon longitudinal 4a1.
According to the illustrated embodiment, the downstream portion 4b 12 of the first transverse portion 4b 1 may be divided into two parts:
  • a first portion in the general shape of arc of an ellipse or arc, the side of the upstream portion 4 b 11, whose exterior angle α is gradually changing, or at least quasi-gradually from an initial value between 46 ° and 49 °, to a final value of the order of 67 ° to 68 °, and
  • a second part generally in the shape of a circular arc, for connection with the second longitudinal section 4 to 1.

Le rayon de la première partie est significativement supérieur au rayon de la seconde partie.The radius of the first part is significantly greater than the radius of the second part.

Cette portion aval 4b12 du premier tronçon transversal 4b1 présente ainsi avantageusement une courbure interne convexe (courbure continument orientée vers l'intérieur).This downstream portion 4b of the first transverse portion 12 4 b 1 thus advantageously an inner convex curvature (curvature continuously oriented inward).

En l'espèce, la première partie, en arc d'ellipse, correspond à environ entre 2/3 et 3/4 de la longueur du premier tronçon transversal 4b1.
La seconde partie, en arc de cercle, constitue la longueur restante dudit premier tronçon transversal 4b1, soit environ entre 1/3 et 1/4 de la longueur dudit premier tronçon transversal 4b1.In this case, the first part, in an elliptical arc, corresponds to approximately between 2/3 and 3/4 of the length of the first transverse section 4 b 1.
The second part, in an arc, constitutes the remaining length of said first transverse section 4 b 1, ie between 1/3 and 1/4 of the length of said first transverse section 4 b 1.

De préférence encore, la portion aval 4b12 du premier tronçon transversal 4b1 est composée de plusieurs rayons.
Par exemple, cette portion aval 4b12 comporte ici des rayons compris entre 15 et 100 mm.More preferably, the downstream portion 12 of the first 4 b 1 b 4 transverse section is composed of a plurality of spokes.
For example, this downstream portion 4 b 12 comprises here radii between 15 and 100 mm.

La portion amont 4b11 dudit premier tronçon transversal 4b1 forme déjà un angle α au niveau de son extrémité située du côté de la portion aval 4b12 suivante.The upper portion 4 b 11 of said first transverse portion 4b 1 already forms an angle α at its end facing the downstream portion 4b next 12.

Encore autrement dit, l'angle défini par les tangentes 9 à la portion aval 4b12 du premier tronçon transversal 4b1 et l'axe longitudinal 7' de l'organe de préhension 7, présente une valeur qui reste inférieure à 45° (cet angle est anti-horaire sur les figures 1 et 2).Still in other words, the angle defined by the tangent 9 to the downstream portion 4b of the first transverse portion 12 4 b 1 and the longitudinal axis 7 'of the gripper 7, has a value that remains below 45 ° (This angle is anti-clockwise on figures 1 and 2 ).

Selon encore un autre référentiel illustré sur la figure 2, l'angle γ défini par les tangentes 9 à la portion aval 4b12 du premier tronçon transversal 4b1 et une droite 10 s'étendant à 45° par rapport à l'axe longitudinal 7' de l'organe de préhension (s'étendant ici encore le long de la bordure transversale en regard 2b1 de la bague 2), présente une valeur supérieure à 0° (cet angle γ est horaire sur la figure 2).According to yet another referential illustrated on the figure 2 , The angle γ defined by the tangent 9 to the downstream portion 4b of the first transverse portion 12 4 b 1 and a right 10 extending 45 ° relative to the longitudinal axis 7 'of the gripper ( extending here again along the transverse border facing 2 b 1 of the ring 2), has a value greater than 0 ° (this angle γ is hourly on the figure 2 ).

En l'occurrence et uniquement à titre d'exemple, cet angle γ est illustré par les angles successifs γ1 à γ10 sur la figure 2, espacés deux à deux de 3 mm, et présentent respectivement les valeurs suivantes de l'ordre de 1,5°, 3°, 6°, 9°, 11 °, 14°, 16°, 22°, 31 ° et 42°. Cet angle γ progresse ainsi jusqu'à une valeur de l'ordre de 90° au niveau du second tronçon longitudinal 4a1.In this case and only by way of example, this angle γ is illustrated by the successive angles γ1 to γ10 on the figure 2 spaced two by two by 3 mm, and respectively have the following values of the order of 1.5 °, 3 °, 6 °, 9 °, 11 °, 14 °, 16 °, 22 °, 31 ° and 42 ° °. This angle γ thus progresses to a value of the order of 90 ° at the second longitudinal section 4 to 1.

De manière alternative, cette portion aval 4b12 pourrait être constituée d'une succession de segments de droites ou d'une combinaison de segments de courbe et de segments de droite.
Par exemple, ces segments ont chacun une longueur de l'ordre de 5 mm.Alternatively, the downstream portion 4b 12 could be constituted by a succession of straight segments or a combination of curved and straight lines segments.
For example, these segments each have a length of the order of 5 mm.

De plus, ce premier tronçon transversal 4b1 de la ligne d'incision 4 est ménagé à proximité de la bague d'assemblage 2 de telle sorte que la distance d entre ledit premier tronçon transversal 4b1 et la bordure transversale en regard 2b1 de cette bague 2 soit comprise entre 1 et 15 mm, et de préférence encore comprise entre 1 et 10 mm.In addition, the first transverse portion 4b 1 of the incision line 4 is formed close to the connection ring 2 so that the distance d between said first transverse portion 4b 1 and the transverse edge facing 2 b 1 of this ring 2 is between 1 and 15 mm, and more preferably between 1 and 10 mm.

Plus précisément, cette « distance d » correspond à la longueur du segment de droite, d'une part, s'étendant perpendiculairement à la tangente 9 de la portion aval 4b12 du premier tronçon transversal 4b1 et, d'autre part, délimité par ladite portion aval 4b12 et par la bordure transversale en regard 2b1 de la bague 2.Specifically, the "distance d" corresponds to the length of the line segment on the one hand, extending perpendicularly to the tangent 9 of the downstream portion 4b of the first transverse portion 12 b 1 and 4, on the other hand , defined by said downstream portion 4 b 12 and the transverse edge facing 2 1 b of the ring 2.

En l'occurrence, cette distance augmente progressivement le long de la portion aval 4b12 du premier tronçon transversal 4b1, depuis une distance de l'ordre de 0,6 à 2 mm, jusqu'à une distance maximale de l'ordre de 15 mm, de préférence entre 5 et 10 mm.In this case, the distance gradually increases along the downstream portion 4b of the first transverse portion 12 4 b 1, from a distance of the order of 0.6 to 2 mm, up to a maximum distance from the order of 15 mm, preferably between 5 and 10 mm.

Cette distance d permet de conserver une ouverture maximale du couvercle 1, et de limiter la distance de la bande de matière résiduelle après détachement de la partie amovible 5.
On obtient ainsi un compromis optimal entre la restitution du produit et la facilité d'ouverture.This distance d makes it possible to maintain a maximum opening of the lid 1, and to limit the distance of the strip of residual material after detachment of the removable part 5.
This gives an optimal compromise between the return of the product and the ease of opening.

D'autre part, la portion aval 4a22 du premier tronçon longitudinal 4a2 définit ici quant à elle un angle extérieur β de l'ordre de 45° avec la ligne 8 précitée perpendiculaire à l'axe longitudinal 7' de l'organe de préhension 7.On the other hand, the downstream portion 4 to 22 of the first longitudinal section 4 to 2 here defines an external angle β of the order of 45 ° with the aforementioned line 8 perpendicular to the longitudinal axis 7 'of the grasping member 7.

Par « angle extérieur β », on entend plus précisément l'angle anti-horaire défini sur la figure 1 entre, d'une part, la portion aval 4a22 du premier tronçon longitudinal 4a2 de la ligne d'incision 4 et, d'autre part, le segment 8b de la ligne de séparation 8, situé à l'extérieur de la ligne d'incision 4.By "external angle β" is meant more precisely the anti-clockwise angle defined on the figure 1 between, on the one hand, the downstream portion 4 to 22 of the first longitudinal section 4 to 2 of the incision line 4 and, on the other hand, the segment 8b of the separation line 8, located on the outside of the incision line 4.

Les portions amont 4b11 et 4a21, constitutives de la zone de cassure initiale 4c, s'étendent quant à elles selon un angle de l'ordre de 90° l'une par rapport à l'autre ; et elles sont reliées par une portion de jonction courbe en arc de cercle.The upstream portions 4 b 11 and 4 to 21, constituting the initial fracture zone 4c extending on the other hand at an angle of about 90 ° with respect to each other; and they are connected by a curved junction portion in an arc.

Par ailleurs, le second tronçon transversal 4b2 est également de forme générale courbe, ici en forme générale d'arc de cercle.
De manière alternative, ce second tronçon transversal 4b2 pourrait être constitué d'une succession de rayons ou d'une pluralité de segments de droites.Furthermore, the second transverse section 4 b 2 is also generally curved, here in the general shape of a circular arc.
Alternatively, this second transverse section 4 b 2 could consist of a succession of rays or a plurality of straight segments.

Là encore, ce second tronçon transversal 4b2 est ménagé à proximité de la seconde bordure transversale 2b2 en regard de la bague 2, de telle sorte que la distance e entre ces deux tronçons 4b2 et 2b2 soit avantageusement comprise entre 1 et 15 mm, et de préférence entre 1 et 10 mm.
Là encore, cette distance particulière permet de limiter l'encombrement de la bande de matière du panneau central 3 restante après le retrait de la portion amovible 5 du couvercle 1.Again, this second transverse portion 4 b 2 is provided near the second transverse edge 2 b 2 facing the ring 2, so that the distance e between the two sections 4 b 2 and 2 b 2 is advantageously between 1 and 15 mm, and preferably between 1 and 10 mm.
Here again, this particular distance makes it possible to limit the bulk of the material strip of the remaining central panel 3 after the removal of the removable portion 5 of the cover 1.

En pratique, l'anneau d'ouverture 7 permet à l'utilisateur d'exercer une traction sur la portion détachable 5, de manière à rompre la ligne d'incision 4 depuis la zone de cassure initiale 4c (attenante à l'organe de préhension 7), jusqu'à une zone distale ou aval située à l'opposée dudit anneau d'ouverture 7. Cette zone distale correspond ici au second tronçon transversal 4b2 de la ligne d'incision 4.In practice, the opening ring 7 allows the user to exert traction on the detachable portion 5, so as to break the incision line 4 from the initial fracture zone 4 c (adjoining the organ gripping 7) to a distal region or downstream at the opposite of said opening ring 7. This distal zone corresponds here to the second transverse portion 4B 2 of the incision line 4.

De manière classique, la manoeuvre de l'anneau 7 est mise en oeuvre en deux temps distincts, pour assurer l'ouverture du couvercle 1.In a conventional manner, the maneuvering of the ring 7 is implemented in two distinct times, to ensure the opening of the lid 1.

Dans la première étape d'amorce de rupture, l'utilisateur saisit la partie libre 7b de l'organe de préhension 7, de sorte à l'écarter de la portion détachable 5.
L'organe de préhension forme alors un levier, mis en rotation par l'utilisateur ; cela provoque, d'une part, une cassure locale de la ligne d'incision 4 au niveau de sa zone de cassure initiale 4c et, d'autre part, le pliage local vers l'intérieur d'une partie du panneau détachable 5 selon la ligne de séparation 8 (qui s'étend perpendiculairement à l'axe longitudinal 7' de l'organe de préhension 7).In the first step of initiation of rupture, the user grasps the free portion 7b of the gripping member 7, so as to move away from the detachable portion 5.
The gripping member then forms a lever, rotated by the user; this causes, on one hand, a local breakage of the incision line 4 at its initial breaking zone 4c and, secondly, the local folding inwardly a portion of the detachable panel 5 along the line of separation 8 (which extends perpendicularly to the longitudinal axis 7 'of the gripping member 7).

Lors de cette première étape, la portion amont 4b11 du premier tronçon transversal 4b1 et la portion amont 4a21 du premier tronçon longitudinal 4a2 de la ligne d'incision 4, sont déchirées.During this first stage, the upstream portion 4 b 11 of the first transverse portion 4b 1 and the upstream portion 4 to 21 of the first longitudinal member 4 2 of the incision line 4 are torn.

La séparation de la portion détachable 5 se poursuit par une seconde étape dans laquelle l'utilisateur exerce une traction sur l'organe de préhension 7, de sorte à continuer la déchirure de la ligne d'incision 4.The separation of the detachable portion 5 continues with a second step in which the user exerts a pull on the gripping member 7, so as to continue the tearing of the incision line 4.

Lors de cette traction, l'anneau d'ouverture 7 progresse au moins approximativement sur la longueur et en regard d'une ligne générale de traction.
Cette ligne de traction est illustrée sur la figure 1 par une ligne discontinue 11 correspondant à sa projection sur le panneau central 3; cette ligne de traction 11 s'étend entre la zone de rupture initiale 4c et le second tronçon transversal 4b2 de la ligne d'incision 4.During this traction, the opening ring 7 progresses at least approximately along the length and facing a general traction line.
This pulling line is illustrated on the figure 1 by a broken line 11 corresponding to its projection on the central panel 3; this pulling line 11 extends between the initial fracture zone 4c and the second transverse portion 4B 2 of the incision line 4.

En l'occurrence, cette ligne de traction 11 comprend deux portions sur sa longueur, à savoir :

  • une portion proximale 11a située du côté de la zone de rupture initiale 4c de la ligne d'amorce d'incision 4, et orientée coaxialement ou au moins sensiblement coaxialement par rapport à l'axe longitudinal 7' de l'organe de préhension 7, et
  • une portion distale 11 b située du côté de la zone distale 4b2 de la ligne d'amorce d'incision 4, et orientée coaxialement ou au moins sensiblement coaxialement par rapport à l'axe médian 3' du panneau central 3.
Ces deux portions 11a et 11 b de la ligne de traction 11 forment ici un angle, l'une par rapport à l'autre, en raison de la position de l'anneau 7 dans un angle de la ligne d'amorce d'incision 4. Elles sont reliées par une portion de jonction 11c, en forme générale d'arc de cercle : l'anneau d'ouverture 7 passe progressivement de la portion proximale 11a à la portion distale 11b.In this case, this traction line 11 comprises two portions along its length, namely:
  • a proximal portion 11 has on the side of the initial rupture zone 4c of the line of incision primer 4, and oriented coaxially or at least substantially coaxially to the longitudinal axis 7 'of the gripper 7, and
  • a distal portion 11 b located towards the distal region 4 b 2 of the line of incision primer 4, and oriented coaxially or at least substantially coaxially with the central axis 3 'of the central panel 3.
These two portions 11a and 11b of the pull line 11 here form an angle with respect to each other, due to the position of the ring 7 in an angle of the priming line incision 4. They are connected by a junction portion 11 c in the general shape of a circular arc: the ring opening 7 gradually changes from the proximal portion 11a to distal portion 11b.

Au cours de cette seconde étape de déchirure, la traction est donc initiée par l'opérateur dans une direction orientée selon l'axe longitudinal 7' de l'organe de préhension 7, correspondant à la portion proximale 11 a de la ligne de traction 11.
Le rendement de la force et de l'énergie de traction appliquées par l'utilisateur, pour initier la déchirure de la ligne d'incision 4 lors de cette étape de traction, est significativement amélioré par rapport aux couvercles habituels, cela grâce à la conformation particulière de la portion aval 4b12 du premier tronçon transversal 4b1.During this second tearing step, the traction is initiated by the operator in a direction oriented along the longitudinal axis 7 'of the gripping member 7, corresponding to the proximal portion 11a of the traction line 11 .
The efficiency of the force and traction energy applied by the user, to initiate the tearing of the incision line 4 during this traction step, is significantly improved compared with conventional lids, thanks to the particular conformation of the downstream portion 4b 12 of the first transverse portion 4b 1.

Toujours au cours de cette seconde étape, la traction sur l'organe de préhension 7 se poursuit de manière classique selon une portion distale 11b de la ligne de traction 11, cela de sorte à déchirer la ligne d'incision 4 en direction du second tronçon transversal 4b2.
La déchirure finale du second tronçon transversal 4b2 de la ligne d'incision 4 va être facilitée par sa forme courbe particulière, qui vise aussi à optimiser le rendement de la force et de l'énergie de traction.
Cette structure particulière permet de limiter le phénomène d'effet ressort souvent observé sur la portion détachée 5.Still during this second step, the traction on the gripping member 7 is continued in a conventional manner along a distal portion 11b of the traction line 11, so as to tear the incision line 4 towards the second section transversal 4 b 2.
The final tear of the second transverse section 4 b 2 of the incision line 4 will be facilitated by its particular curved shape, which also aims to optimize the efficiency of the force and the traction energy.
This particular structure makes it possible to limit the spring effect phenomenon often observed on the detached portion 5.

A titre indicatif, des essais avec le couvercle tel que représenté sur la figure 1 montrent que, pour son ouverture complète, il est nécessaire d'appliquer une force totale de 21,8 N et une énergie de 1,12 J, alors qu'un couvercle muni d'une ligne d'amorce de rupture classique, nécessite pour son ouverture complète une force de 32,4 N et une énergie de 1,41 J.As an indication, tests with the lid as shown on the figure 1 show that, for its full opening, it is necessary to apply a total force of 21.8 N and an energy of 1.12 J, whereas a cover provided with a conventional break initiation line, requires for its opening completes a force of 32.4 N and an energy of 1.41 J.

De manière générale, la bague d'assemblage 2 du couvercle 1 pourrait présenter toute autre forme, vue de dessus, adaptée à la section du corps de réception (par exemple ovale, circulaire ou polygonale).In general, the assembly ring 2 of the lid 1 could have any other shape, seen from above, adapted to the section of the receiving body (for example oval, circular or polygonal).

Le couvercle selon l'invention a l'intérêt de présenter une bonne sensation d'ouverture et une valeur de reprise améliorée, tout en maintenant une surface d'ouverture maximale.The lid according to the invention has the advantage of having a good opening feeling and an improved recovery value, while maintaining a maximum opening area.

Claims (10)

  1. Metal lid for a container body, in particular for a container of the metal can type, said lid (1) comprising (i) a central part (3) forming a sealing central panel, and (ii) a peripheral part (2) adapted to be secured to said container body, wherein said central part (3) comprises a removable part (5) delimited by a break-off line (4) in the general shape of a parallelogram, and wherein said break-off line (4) is consisted of two longitudinal sections (4a) and two transverse sections (4b), wherein said removable part (5) of the lid (1) is equipped, at one of the surfaces thereof, with a gripping member (7) consisted of two parts (7a, 7b) through which a longitudinal axis (7') passes:
    - a first part (7a) secured to said removable part (5) and a second part (7b), the actual gripping part, wherein said first part (7a) of the gripping member (7) is secured at a junction angle (4c) corresponding to the junction between a first longitudinal section (4a2) and a first transverse section (4b1) of said break-off line (4), which first longitudinal section (4a2) and first transverse section (4b1) of said break-off line (4) each comprising two portions: (i) an upstream portion (4a21, 4b11) arranged at said junction angle (4c), intended to be torn by an operation of initially pivoting said gripping member (7) and (ii) a downstream portion (4a22, 4b12) remote from said junction angle (4c), made up by the remaining length of said section (4a2, 4b1) and intended to be torn by a subsequent operation of pulling the gripping member (7),
    which downstream portion (4b12) of the first transverse section (4b1) of the break-off line (4) extends such that, all along the length thereof, the tangents (9) to it define an outer angle (α) greater than 45° with a straight line (8) perpendicular to said longitudinal axis (7') of the gripping member (7), wherein said outer angle (α) increases over the length of the downstream portion (4b12) of the transverse section (4b1) of the break-off line (4), starting from the upstream portion thereof (4b11),
    characterized in that the downstream portion (4b12) of the first transverse section (4b1) of the break-off line (4) is of generally curved shape, divided into two parts :
    - a first part in the general shape of an arc of an ellipse, on the upstream portion (4b11) side, and
    - a second part in the general shape of an arc of a circle, for the connection with the second longitudinal section (4a1).
  2. Metal lid according to claim 1, characterized in that the downstream portion (4b12) of the first transverse section (4b1) of the break-off line (4) comprises, on the upstream portion (4b11) side, the first part in the general shape of an arc of an ellipse, the outer angle (α) of which changes from an initial value comprised between 46° and 49° to a final value of the order of 67° to 68°.
  3. Metal lid according to any one of claims 1 or 2, characterized in that, at the downstream portion (4b12) of the first transverse section (4b1) of the beak-off line (4), the radius of the first part is greater than the radius of the second part.
  4. Metal lid according to claim 3, characterized in that the downstream portion (4b12) of the first transverse section (4b1) of the break-off line (4) is consisted of a succession of radii.
  5. Metal lid according to claim 3, characterized in that the downstream portion (4b12) of the first transverse section (4b1) of the break-off line (4) is consisted of a succession of straight line segments.
  6. Metal lid according to any one of claims 1 to 5, characterized in that the peripheral part (2) of the lid (1) is in the general shape of a parallelogram, consisted of two longitudinal edges (2a) and two transverse edges (2b), and in that the break-off line (4) extends along said peripheral part (2) of the lid.
  7. Metal lid according to claim 6, characterized in that the first transverse section (4b1) of the break-off line (4) is arranged near a first transverse edge (2b1) of the peripheral part (2) of the lid (1), such that the distance (d) between said first transverse edge (4b1) of the break-off line (4) and said first transverse edge (2b1) of the peripheral part (2) is comprised between 1 and 15 mm.
  8. Metal lid according to any one of claims 6 or 7, characterized in that the second transverse section (4b2) of the break-off line (4) is of curved shape.
  9. Metal lid according to claim 8, characterized in that the second transverse section (4b2) of the break-off line (4) is arranged near the second transverse edge (2b2) of the peripheral part (2) of the lid (1), such that the distance (e) between said second transverse section (4b2) of the break-off line (4) and said opposite transverse edge (2b2) of the peripheral part (2) is comprised between 1 and 15 mm.
  10. Container, in particular of the metal can type, equipped with a metal lid (1) according to any one of claims 1 to 9.
EP10807620.9A 2009-12-17 2010-12-17 Integral metal lid having parallelogram-shaped predetermined break-off line Not-in-force EP2512940B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10807620T PL2512940T3 (en) 2009-12-17 2010-12-17 Integral metal lid having parallelogram-shaped predetermined break-off line

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0906115A FR2954290B1 (en) 2009-12-17 2009-12-17 MONOBLOC METAL COVER WITH PARALLELOGRAM FORMED RUPTURE PRIMER LINE
PCT/FR2010/052793 WO2011073593A1 (en) 2009-12-17 2010-12-17 Integral metal lid having parallelogram-shaped predetermined break-off line

Publications (2)

Publication Number Publication Date
EP2512940A1 EP2512940A1 (en) 2012-10-24
EP2512940B1 true EP2512940B1 (en) 2015-07-29

Family

ID=42027717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10807620.9A Not-in-force EP2512940B1 (en) 2009-12-17 2010-12-17 Integral metal lid having parallelogram-shaped predetermined break-off line

Country Status (10)

Country Link
EP (1) EP2512940B1 (en)
JP (1) JP5695663B2 (en)
KR (1) KR101835804B1 (en)
BR (1) BR112012014472A2 (en)
CL (1) CL2012001388A1 (en)
ES (1) ES2550763T3 (en)
FR (1) FR2954290B1 (en)
MA (1) MA33750B1 (en)
PL (1) PL2512940T3 (en)
WO (1) WO2011073593A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR450848A (en) * 1912-10-25 1913-04-04 Biscuits Olibet Soc D Device for closing and opening a metal box with a welded cover
FR1241919A (en) * 1959-10-22 1960-09-23 Kelsey Hayes Compnay Opening device for sealed containers
USRE27017E (en) * 1969-09-25 1970-12-29 Fraze can end with folded full tab
US3653536A (en) * 1970-08-31 1972-04-04 Aluminum Co Of America Easy opening device for a rectangular container end
FR2502122B1 (en) * 1981-03-20 1985-07-05 Cebal EASY OPENING COVER WITH PULL-OUT TONG AND INCISION LINE
US20060042982A1 (en) * 2004-09-01 2006-03-02 Goodwin G W Jr Welding rod container

Also Published As

Publication number Publication date
JP5695663B2 (en) 2015-04-08
BR112012014472A2 (en) 2017-03-14
KR20120115968A (en) 2012-10-19
JP2013514241A (en) 2013-04-25
EP2512940A1 (en) 2012-10-24
KR101835804B1 (en) 2018-03-08
PL2512940T3 (en) 2015-12-31
ES2550763T3 (en) 2015-11-12
FR2954290B1 (en) 2012-03-23
CL2012001388A1 (en) 2012-10-12
FR2954290A1 (en) 2011-06-24
MA33750B1 (en) 2012-11-01
WO2011073593A1 (en) 2011-06-23

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