RU2774725C1 - Lid for closing a container and a method for making the same - Google Patents

Abstract

FIELD: container lids.

SUBSTANCE: invention relates to a lid for a container and a corresponding method for making the same. The lid comprises a side wall extending around the axis and a transverse wall located at the edge of the side wall, wherein a separating line is made on the side wall, limiting the retaining ring, made with the possibility of remaining attached to the neck of the container and with the possibility of internal engagement with the expansion of the neck, and closing an element configured to be removably engaged with the mouth for opening or closing the container. The separating line extends around said axis and is interrupted in the circumferential direction so that between the retaining ring and the closing element there remains a connecting part that extends in the circumferential direction by an appropriate angle, while the lid has a notch line that runs transversely to said axis between the separating line and the free edge of the retaining ring, so that between the separating line and the score line, two connecting strips are defined, which connect the retaining ring with the connecting section. The connecting strips are deformable, and the connecting section on the outside has a protrusion that protrudes from the connecting section and is located between the separation plane in which the dividing line runs and the notch line, so that when the closing element is in the open position, and the connecting strips hold the closing element is connected to the retaining ring, the edge of the connecting section, which in the closed position faces the retaining ring, in the open position faces the rim of the neck, and the protrusion rests against the neck in said open position.

EFFECT: improvement of lid for a container.

19 cl, 28 dwg

Description

The invention relates to a lid for a container, in particular to a lid comprising a retaining ring which is configured to be connected to the mouth of the container, the lid also comprising a closure element which remains connected to the retaining ring after opening. The cap according to the invention is particularly, but not exclusively, suitable for use on bottles intended for the storage of liquid substances.

The invention also relates to a corresponding method for the manufacture of such a cap.

Bottle caps are known which have a cup-shaped body having an internal thread configured to engage with the external thread of the bottle neck. Known lids also include a tamper-evident ring connected to the cup body via breakable members. When the lid is opened for the first time, the cup body separates from the tamper-evident ring as a result of rupture of the ruptured elements. The tamper evident ring remains connected to the neck of the bottle while the cup body can be unscrewed by the user, thereby separating the cup body from the bottle for access to the contents of the bottle. Subsequently, the cup body can be screwed back onto the neck to reseal the bottle.

Sometimes, after emptying the bottle, the user intentionally or accidentally throws the cup body on the ground, while the bottle, together with the tamper-evident ring connected to it, should in the right case be thrown into the trash can.

To overcome this shortcoming, closures have been proposed comprising a retaining ring which is operable to connect to the neck of a bottle and a closure member connected to the retaining ring by means of a swivel member. The closure element is rotatable around the swivel element between an open position in which the user can access the contents of the bottle and a closed position in which the closure element prevents access to the bottle. The pivot keeps the closure connected to the retaining ring and thus to the bottle, thereby preventing the closure from being thrown to the ground apart from the bottle.

However, prior art lids containing a pivoting member have the disadvantage of being rather complicated to manufacture. In fact, the pivot element is usually made in the same mold as the closure, in particular by injection molding or compression molding.

Thus, in order to produce closures with a known type of pivot, it is necessary to use special molds different from those normally used for the production of closures without a pivot. Such injection molds are more complex than known molds, in particular because pivot closures of the known type may have zones of greatly reduced thickness which are difficult to obtain because the molten polymeric material flows with difficulty into the portions of the mold intended to be molded. zone data.

This increases the cost of manufacturing pivot closures and/or the cycle time required to make them.

In pivot closures of the known type, the closure element, once moved to the open position, is sometimes prematurely closed by pivoting around the pivot. It is also possible that the closure element partially rotates around the pivot element, moving into a vertical or near-vertical configuration. In these cases, the closure may undesirably hit the face of a user who is drinking from a bottle that has a pivot cap, or may be caught between the bottle and a container, such as a glass, into which the liquid contained in the bottle is poured.

Moreover, in known type of pivot closures, when the closure is moved to the open position, the retaining ring, which remains connected to the neck, is free to rotate around the neck itself. Thus, it is possible that the user drinks the liquid contained in the bottle to which the swivel cap is attached, or pours the liquid contained in the bottle into a glass, while the retaining ring rotates around the mouth by gravity along with the closure. . In this case, the closure may hit the face of the user who is drinking or be caught between the mouth of the bottle and the glass, preventing liquid from pouring into the glass.

International Publication WO 2009048273 shows a lid configured to remain connected to the container mouth even after the lid is first opened, and comprising a protrusion positioned over a portion of the pivot member and configured to extend over the lid retaining ring to engage with the support step on the neck thereafter. when the lid is opened.

The aim of the invention is to improve known types of closures, in particular closures comprising a retaining ring configured to remain connected to the mouth of the container and a closure element configured to be removably engaged with the mouth to allow the user to open or alternatively close the container.

Another object is to provide a lid for a container of the above type, which can be easily manufactured.

Another object is to provide a lid for a container containing a closure that remains connected to the retaining ring, with the closure remaining in place when the lid is in the open position.

Another object is to provide a lid for a container in which, in the open position, the risk is reduced that the closure member inadvertently strikes the user's face or prevents the substance contained in the container from being poured into a glass or the like.

According to the invention, there is provided a lid for a container according to claim 1 and claims dependent on it, and a method for manufacturing a lid according to claim 19.

In one aspect of the invention, there is provided a closure for a container, comprising a side wall extending about an axis and a transverse wall located at the edge of the side wall, wherein a separating line is provided on the side wall delimiting a retaining ring configured to remain attached to the mouth of the container and with the possibility of internal engagement with the expansion of the neck, and the closing element, which is made with the possibility of removable engagement with the neck for opening or closing the container, and the dividing line passes around the specified axis and is interrupted in the circumferential direction, leaving between the retaining ring and the closing element a connecting section extending in circumferential direction at an appropriate angle, the lid also having a scoring line which extends transversely to said axis between the separating line and the free edge of the retaining ring, so that two joints are delimited between the separating line and the scoring line. sealing strips connecting the retaining ring with the connecting section, wherein the connecting strips are deformable to ensure rotation of the connecting section when the closing element is moved from the closed to the open position, and the connecting section on the outside has a protrusion protruding from the connecting section and located between the separating plane, in which the dividing line extends, and a score line, so that when the closure is in the open position and the connecting strips keep the closure connected to the retaining ring, the edge of the connecting section, which in the closed position faces the retaining ring, in the open position faces the rim neck, and the ledge rests on the neck in the specified open position.

Thanks to the connecting section, the closure element is securely connected to the retaining ring and thus to the container mouth. This prevents the closure from being thrown to the ground separately from the container. In this way, the likelihood is increased that the closure element together with the container will be properly disposed of with the same type of waste, in particular with plastic waste.

Thanks to this invention, i.e. thanks to the protrusion provided in the connecting portion, it is possible to form a lid which ensures a stable open position. Indeed, when the connecting section is rotated and the closure element moves from the closed to the open position, an interaction occurs between the protrusion and the neck of the container, since the protrusion rests on it. This interaction is preserved in the open position. To return the closing element to the closed position, it is necessary to apply a predetermined force to overcome the interaction between the neck and the ledge. This makes it difficult, if not impossible, for the closure member to return to the closed position on its own.

More specifically, in the open position, when the protrusion rests against the container mouth, the deformed connecting strips also apply a force to the connecting section, which ensures that the connecting section is kept in contact with the container mouth, and are made with the possibility of co-engagement with the protrusion. This causes interaction between the protrusion and the neck of the container, which ensures that the closure element is held stably in the open position.

Moreover, due to the fact that the protrusion is located between the dividing line and the scoring line, a stable abutment of the protrusion next to the neck extension is possible. This is a positive point, as the user may notice when the maximum interaction with the extension has been overcome and the lip needs to be detached from the extension.

If the protrusion is located closer to the score line than to the dividing line, the end edge of the protrusion may be positioned against the neck in an open position, such as above the flare or on the top wall of the flare facing the rim of the neck.

In this case, the user, in order to detach the closure element blocked by the protrusion and by twisting the connecting strips, will have to pull the closure element outwardly, allowing the protrusion to slide along the top wall of the extension.

If, on the contrary, the protrusion is located closer to the dividing line than to the notch line, the bottom wall of the protrusion, which in the closed position faces the free edge, can be located under the expansion, for example, to ensure contact with the bottom wall of the expansion, facing away from the rim necks.

In this case, the user, in order to detach the closure element blocked by the protrusion and by twisting the connecting strips, will have to pull the closure element outwardly until the protrusion is completely released from the extension.

Thus, because the protrusion is located between the dividing line and the scoring line, the user is forced to detach the protrusion from the extension to move the closure from the neck. This provides the advantage that the user can see when the maximum engagement has been overcome and thus when the closure can be moved away from the neck.

The interaction between the protrusion and the neck also creates an obstacle to the rotation of the cover, in particular the retaining ring, around the neck.

In one embodiment, the connecting strips are configured to deform by twisting when the closure member is moved from a closed to an open position.

This twisting may affect at least one part of the axial dimension of each connecting strip, defined as the size of the connecting strip along a line parallel to said axis, in the closed position of the closure element. During rotation of the connecting section, its edge, initially facing the free edge, slides in contact with the neck until an open position is reached in which this edge faces the neck rim, the protrusion is positioned against the neck and an interaction is created that reaches its maximum value when the connecting section is essentially perpendicular to the neck and the protrusion is in the final stop position, and which is reduced (but does not reach zero value) after the turning of the connecting section.

Again, even when moving to the open position, there is an advantage that the user can notice when the maximum engagement has been overcome, since the user can recognize when the protrusion is in stable engagement with the extension.

A user moving the closure towards the open position notices that the position at which the interaction is maximum has been passed as their hand perceives that the closure has been stably moved to the open position. This is welcomed by the user, who is confident that he opened the container correctly.

In one embodiment, the retaining ring has a retaining portion that is internally engaged with the circumferential expansion of the neck and extends between the notch line and the free edge of the retaining ring.

In one embodiment, the connecting section has an angular dimension relative to the axis of the side wall, which is greater than or equal to 20°, preferably greater than or equal to 25° and less than or equal to 120°, preferably less than or equal to 90°.

In this way, the connecting section is designed to be easily turned over, but at the same time to be able to hold the closure element stably in the open position.

In one embodiment, the connecting portion has a protrusion that protrudes towards the free edge and is formed by a central segment and a pair of peripheral notch line segments such that the lower edge of the web formed by the central segment faces towards the neck rim when in the open position. As a variant, the web is foldable about the pivot line so that it can rest on the neck near the expansion.

Provided the advantage that the ledge can be at least partially located on the jumper.

Due to this, the stability of the open position of the closing element relative to the neck is further enhanced, since the web protruding relative to the connecting strips allows the protrusion to be placed in various positions, even closer to the free edge of the lid, given the axial line parallel to the axis of the side wall.

Furthermore, due to the fact that the web can optionally be bent around a pivot line, the lip can be better adapted to the shape of the container mouth and thus can securely lock the closure on the mouth, preventing any pivotal movement of the closure, as in towards the inlet and around the mouth of the bottle.

In another aspect of the invention, a method for making a closure for a container is provided. Indeed, the lid according to the invention can be produced relatively simply, without the need for special injection molds. Indeed, the lid of the invention can be made in a traditional injection mold if the notch line is made by a cutting operation. With the cutting operation, it is possible to obtain a notch line that passes through the entire thickness of the side wall, or a notch line that does not pass through, but at which the side wall thickness is only partially crossed. It is also possible to consider the possibility of producing a notch line by casting, inside the mold in which the lid is made, but still without overly complicated form, due to the particularly simple shape of the notch line, even if it has a central segment and a pair of peripheral segments, as an option. , offset relative to each other in the axial direction, to perform the jumper. In this case, the notch line can also be made in the form of a line of weakening. The protrusion can easily be made with a conventional injection mold leaving a recessed area in the mold to form a protrusion protruding from the side wall of the lid.

Due to the fact that the scoring line extends between the separating line and the free edge of the retaining ring, the scoring line does not weaken the connecting section. Thus, in the proposed cover, the connecting section is sufficiently strong, which makes it difficult to accidentally separate the retaining ring from the closing element.

The connecting strips, together with the connecting section, form a pivoting means which is movable along the center line, significantly exceeding the possibility of movement that the connecting section alone could provide.

Indeed, such a pivot means allows the closure element to move away from the tamper-evident ring over a significant axial distance determined by the combination of the length of the connecting strips and the connecting section. In this way, the closure element can be easily detached from the mouth of the container.

The connecting strips can be arranged symmetrically to each other with respect to a plane containing the axis of the side wall and the central line of the connecting section, to form a symmetrical shape, which reduces involuntary movements of the closing element when the lid is in the open position, in particular, limiting its lateral movements.

In one embodiment, the connecting section has a substantially constant thickness in the separation plane containing the separation line.

This makes the lid according to the invention even easier to manufacture, since special injection molds are not needed to produce triangular pivots or very thin connecting sections.

The invention may be better understood and may be made with reference to the accompanying drawings, which illustrate several non-limiting exemplary embodiments of the same, and in which:

Fig. 1 is a side view of a container lid in a closed position fitted over the mouth of the container and containing a protrusion positioned between the dividing line and the score line;

Fig. 2 is a front view of the cover of FIG. 1 in the closed position;

Fig. 3 is a front view as shown in FIG. 2 in a separated state, the lid closure being separated from the retaining ring;

Fig. 4 is a side view of the cover shown in FIG. 1, in the open position, in which the lip of the lid abuts against the top wall of the neck extension because the lip is closer to the score line than to the dividing line;

Fig. 3 is a side view of the embodiment shown in FIG. 1 in the open position, with the protrusion of the lid in contact with the bottom wall of the expansion of the mouth, since the protrusion is closer to the dividing line than to the score line;

Fig. 6 is a side view of another embodiment of the cover shown in FIG. 1 in the open position, with the lip of the cap in contact with the outer end of the neck extension;

Fig. 7 is a side view of a neck onto which a cap according to the present invention may be screwed;

Fig. 8 is a perspective view of the neck shown in FIG. 7;

Fig. 9 is a front view of a variant of the cover shown in FIG. 1, according to an alternative embodiment, in a closed configuration, with the protrusion of the cover located on the bridge;

Fig. 10 is a front view of the cover shown in FIG. 9, in a split configuration, showing the beginning of separation of the lid closure from the retaining ring;

Fig. 11 is a side view of the cover shown in FIG. 9 in the open position, with the protrusion of the lid abutting the upper wall of the neck extension, since the protrusion is closer to the central segment of the notch line than to the dividing line;

Fig. 12 is a side view of an embodiment of the cover shown in FIG. 9, in the open position, with the protrusion of the lid in contact with the lower wall of the expansion of the mouth, since the protrusion is closer to the dividing line than to the central segment of the score line;

Fig. 13 is a side view of another embodiment of the cover shown in FIG. 9, in the open position, with the lip of the lid in contact with the outer end of the neck extension;

Fig. 14 is a plan view of a variant of the cover shown in FIG. 1, and the protrusion has a concave shape;

Fig. 15 is a plan view of another embodiment of the cover shown in FIG. 1, wherein the protrusion is concave and discontinuous;

Fig. 16 is a front view of the cover shown in FIG. 15 in a split configuration with the lid closure separated from the retaining ring;

Fig. 17 is a plan view of another embodiment of the cover shown in FIG. 1, and the protrusion has a convex shape;

Fig. 18 is a plan view of yet another embodiment of the cover shown in FIG. 1, and the protrusion has a convex shape and is discontinuous;

Fig. 19 is a side view of a cover according to another embodiment alternative to that shown in FIG. 1, wherein the lip of the lid is thicker than the lip of the lid shown in FIG. one;

Fig. 20 is a front view of the cover shown in FIG. 19 in a split configuration with the lid closure separated from the retaining ring;

Fig. 21 is a side view of the cover shown in FIG. 19, in the open position, with the protrusion resting on the top wall of the neck extension;

Fig. 22 is a side view of an embodiment of the cover shown in FIG. 19, in an open position, with the lip of the lid in contact with the bottom wall of the neck extension;

Fig. 23 is a side view of another embodiment of the cover shown in FIG. 19 in an open position, with the protrusion in contact with the outer end of the neck extension;

Fig. 24 is a side view of a lid according to yet another alternative embodiment to that shown in FIG. 9 in a closed configuration, with the lip of the lid located on the web and having a greater thickness than the lip of the lid shown in FIG. 9;

Fig. 25 is a front view of the cover shown in FIG. 24 in a split configuration with the lid closure separated from the retaining ring;

Fig. 26 is a side view of the cover shown in FIG. 24 in the open position, with the protrusion resting on the top wall of the neck extension;

Fig. 27 is a side view of an embodiment of the cover shown in FIG. 24, in the open position, with the protrusion of the lid in contact with the bottom wall of the expansion of the mouth;

Fig. 28 is a side view of another embodiment of the cover shown in FIG. 24 in the open position with the protrusion in contact with the outer end of the neck extension.

Hereinafter, the same item numbers are used to designate the same elements in different drawings. It should also be noted that, unless differences are explicitly stated, it should be understood that the same elements may also be applied to different variants.

In the accompanying drawings, the number 1 indicates the cover according to this invention.

Cover 1 is shown in Fig. 1 in the closed position it is in after it has left the closure production line and is ready to be put on a container not shown. In this state, the lid 1 comprises a side wall 2 that extends around the Z-axis and a transverse wall 3 located at the edge of the side wall 2 to cover this edge. The transverse wall 3 extends transversely, in particular perpendicular to the Z-axis. The transverse wall 3 can be flat, although other shapes are theoretically possible. In the illustrated example, in plan view, the transverse wall 3 has a substantially circular shape.

The side wall 2 and the transverse wall 3 form a concave body.

In more detail, the side wall 2 is in the form of a skirt that extends around the Z-axis. In particular, the side wall 2 is connected to the transverse wall 3 by a connecting zone 12, which in cross section may be in the form of a beveled edge or a circular joint.

The lid 1 has a dividing line 4 located on the side wall 2 and extending around the Z axis. The dividing line 4 runs in a separation plane located transversely, in particular perpendicular to the Z axis. The dividing line 4 delimits the retaining ring 5 and the closing element 6 on the lid 1. Said ring and element are located on opposite sides of the dividing line 4. As described in more detail below, when the cover 1 is moved to the open position, the closing element 6 is separated from the retaining ring 5 along the dividing line 4.

The retaining ring 5 is configured to remain attached to the mouth 18 of the container and is internally engaged by an extension 23 of the mouth 18. The closure member 6 is configured to releasably engage the mouth 18 to open or close the container.

Along the dividing line 4, breakable bridges (not illustrated) can be provided that connect the retaining ring 5 to the closure member 6. The breakable bridges are designed to break when the lid 1 is first moved to the open position to indicate that the integrity of the container has been compromised.

The dividing line 4 may be parallel to the free edge 16 of the cover 1. More specifically, the free edge 16 defines the retaining ring 5 on the side opposite the transverse wall 3.

The dividing line 4 does not extend through the entire 360° angle around the Z-axis. The dividing line 4 is interrupted in the circumferential direction to form a connecting section 8 on the side wall 2, in which the closing element 6 remains connected to the retaining ring 5.

In other words, the dividing line 4 has a first end 9 and a second end 10. A connecting section 8 is located between the first end 9 and the second end 10. At the connecting section 8, the retaining ring 5 is connected to the closing element 6.

As shown in FIG. 2, the connecting section 8 extends around the Z-axis by a predetermined angular dimension.

The connecting section 8 defines a turning strip around which the closure element 6 can be rotated after being detached from the mouth 18 of the container on which the lid 1 is fitted, shown in more detail in FIG. 7 and 8.

This headland extends between two opposite end zones of the connecting section 8, i.e. it extends from the area of the connecting section 8 immediately adjacent to the first end 9 to the area of the connecting section 8 immediately adjacent to the second end 10.

Thus, the headland defined by the connecting section 8 affects the entire angular dimension of this section 8, without alternating arrow-shaped turning elements or zones of reduced thickness.

In the example shown, the closure element 6 also has the shape of a bowl-shaped body.

The side wall 2 has, on its inner surface, a removable fastening means, not shown, with which the closure element 6 can be removably connected to the opening 18 of the container. The removable fastener may comprise, for example, an internal thread designed to engage with an external thread 17 provided on the neck 18.

The side wall 2 may have, on the respective outer surface, notches 13 extending parallel to the Z axis and designed to facilitate the gripping of the lid 1 by the user or by a lid machine that puts the lids 1 on the container to be closed. Notches 13 may also extend into the connecting zone 12 and/or onto the retaining ring 5.

In the illustrated example, the side wall 2 comprises a cylindrical section on which notches 13 are made, and an expanded section, the diameter of which is larger than the diameter of the cylindrical section. The expanded portion may be defined by a smooth outer surface, i. e. has no notches. However, this is not necessary, as the notches can also run over a wide area. Step 19 can be located between the cylindrical section and the expanded section.

The retaining ring 5 extends between the free edge 16 and the dividing line 4. The retaining ring 5 may be defined by an outer surface in the form of a cylinder or a truncated cone. In the closed position of the lid 1 shown in FIG. 1 and 2, holding the ring 5 coaxially with respect to the closing element 6.

The retaining ring 5 internally includes an engaging member 20 shown at least in FIG. 3 suitable for engagement with extension 23 shown at least in FIG. 3-8, which is circular in shape and protrudes from the outer surface of the neck 18. The engagement member 20 is configured to contact the circular extension 23 to prevent axial movement of the retaining ring 5 away from the neck 18 when the closure member 6 is moved away from the neck 18. .

The neck 18, shown in more detail in FIG. 7 and 8, is limited by an outer surface 18a, which in the illustrated example is cylindrical and coaxial with the longitudinal axis Z, which, when the lid 1 is put on the mouth 18 of the container in the closed position, coincides with the longitudinal axis Z of the lid 1.

The outer surface 18a extends to a rim 18b which surrounds an opening 18c through which the container can be accessed when the closure 6 is in the open position. Conversely, the closing element 6 closes the opening 18c when it is in the closed position.

Protruding from the outer surface 18a is a circular extension 23 suitable for engaging with the engagement member 20 located inside the retaining ring 5 to prevent the retaining ring 5 from detaching from the neck 18.

The circumferential extension 23 may be in the form of a truncated cone, its diameter increasing along a line extending away from the rim 18b, and thus may include a top wall 23a that faces the rim 18b.

However, other geometries of the circular expansion 23 are also possible.

The circular extension 23 also includes a bottom wall 23b, facing away from the rim 18b, with which said at least one engaging element of the retaining ring 5 contacts.

Top wall 23a is movable in direction from rim 18b to a corresponding outer end 23c which forms an outer rim for expansion 23.

The neck 18 also has an external thread 17 formed on the outer surface 18a and protruding from the outer surface 18a.

The lid 1 is intended to be put on the neck 18 when the closing element 6 is in the closed position. The lid 1 in particular is put on the neck 18 so that the engaging element 20, located inside the retaining ring 5, is under the circular extension 23.

The engaging element 20 may be in the form of a not shown annular element which is bent around the free edge 16 towards the inside of the retaining ring 5. More specifically, the annular element may be continuous or discontinuous. Indeed, in Fig. 3 shows possible bent elements in the form of protrusions that protrude from the free edge 16 and are bent towards the interior of the retaining ring 5 to form the engaging element 20. Alternatively, according to the not shown embodiment, the engaging element 20 may be in the form of a continuous or discontinuous expansion, which from the inner surface of the retaining ring 5 protrudes towards the Z axis to engage with the extension 23.

As shown in FIG. 1, the lid 1 has a scoring line 21 which extends on the side wall 2 transversely, in particular perpendicularly, to the Z axis. Z.

If the lid 1 is positioned in the same orientation it will have when placed on the container, i.e. with the transverse wall 3 facing upwards, the notch line 21 is located below the dividing line 4.

The retaining ring 5 includes a retaining section 501, which is designed to internally engage with the circular expansion 23 of the neck 18 and extends between the notch line 21 and the free edge 16 of the retaining ring 5.

Thus, the notch line 21 defines the holding portion 501 on the side opposite the free edge 16.

The connecting section 8 is located on the opposite side of the score line 21 relative to the holding section 501.

Thus, the notch line 21 defines the connecting section 8 towards the holding section 501.

It should be noted that the notch line 21 has an angular extent measured with respect to the Z-axis and greater than the angular distance (also measured with respect to the Z-axis) between the first end 9 and the second end 10 of the dividing line 4, i. the angular dimension of the connecting portion 8. For example, the angular extent of the notch line 21 may be from 60° to 200°, preferably from 75° to 180°.

The angular size of the connecting section 8 relative to the Z axis, i.e. the circumferential angular distance between the first end 9 and the second end 10 of the dividing line 4 may be greater than or equal to 20° and less than or equal to 120°, preferably greater than or equal to 25° and less than or equal to 90°.

In the illustrated example, the connecting section 8 is centered on the dividing line 21. In other words, the midpoint of the dividing line 21 and the center line of the connecting section 8 are aligned with each other along a line parallel to the Z axis, i. lie in a common plane containing the Z-axis. However, this condition is not necessary, since even a non-ideal centered location of the notch line 21 relative to the connecting section 8 is allowed.

In the illustrated example, the notch line 21 has a flat curved shape lying in a plane. However, other forms are also possible.

The notch line 21 and the dividing line 4 may be parallel to each other, although this is not a requirement. For example, the scoring line 21 and the dividing line 4 may be slightly inclined relative to each other. Alternatively, the score line 21 may comprise portions having different slopes, not necessarily parallel to each other.

As shown at least in FIG. 2, the notch line 21 has an end 27 and another end 28. The end 27 extends at an angle outside the connecting section 8, past the first end 9 of the separation line 4. The other end 28 also extends at an angle outside the connecting section 8, but extends beyond the second end. 10 dividing line 4.

The notch line 21 comprises a central segment 24 located between a peripheral segment 25 and another peripheral segment 26. The central segment 24 faces the connecting section 8. The peripheral segment 25 faces the dividing line 4, in particular the end section of the dividing line 4. More precisely, the peripheral segment 25 faces the dividing line 4 in the area between the first end 9 of the dividing line 4 and the end 27 of the notch line 21. The other peripheral segment 26 faces the dividing line 4, in particular, the other end portion of the dividing line 4. More precisely, the other peripheral segment 26 faces the dividing line 4 in the area between the second end 10 of the dividing line 4 and the other end 28 of the score line 21.

Between the peripheral segment 25 of the notch line 21 and the section of the dividing line 4, which starts from the first end 9, a connecting strip 29 is formed for connecting the connecting section 8 with the retaining ring 5. Also between the other peripheral segment 26 of the notch line 21 and the specified other section of the dividing line 4 , which starts from the second end 10, another connecting strip 30 is formed for connecting the connecting section 8 with the retaining ring 5. The connecting strips 29 and 30 are shown at least in FIG. 3.

The peripheral segment 25 and the other peripheral segment 26 respectively form a free lower edge and another free lower edge of the connecting strip 29 and the other connecting strip 30, respectively, and may lie in the same plane as the central segment 24 of the notch line 21 or may have different inclinations.

In the illustrated example, the connecting strip 29 and another connecting strip 30 are arranged symmetrically to each other with respect to the plane containing the Z-axis and the center line of the connecting section 8.

The connecting strips 29, 30 are deformable, which makes it possible to rotate the connecting section 8 when the closing element 6 is moved from the closed to the open position.

The notch line 21 may be in the form of a through notch passing through the entire thickness of the side wall 2. Even if this feature is not shown in the drawings, one or more breakable elements can be located along the notch line 21, designed to break when the cover 1 is first opened.

Alternatively, the notch line 21 may be provided as a line of weakness which does not extend through the entire thickness of the side wall 2, but in which the thickness of the side wall 2 is reduced compared to the surrounding areas.

At the first end 9 and the second end 10 of the dividing line 4 and/or at the end 27 and the other end 28 of the scoring line 21 not shown scoring zones can be made. The notched zones may have a circular geometric shape and, as a rule, have a transverse dimension greater than the width of the corresponding notch line or dividing line. This prevents the propagation of fracture cracks starting from the notch line or parting line.

In the central part of the connecting section 8, it is possible to make a reduction cut not illustrated in the drawing, the dimensions of which are very limited relative to the dimensions of the connecting section 8, so as not to adversely affect the strength of the connecting section 8. The reducing notch provides an increase in the possibility of deformation of the central part of the connecting section 8 by reducing stress in the surrounding areas.

The lid 1 is put on the neck 18 of the container in the closed position shown in FIG. 1 and 2. The cover 1 is positioned so that the engaging element 20, made inside the retaining ring 5, is located under the circular expansion 23 on the neck 18.

It should be noted that, as shown more clearly in FIG. 3, the connection section 8 is bounded from below by an edge 50 which, in the closed position of the closure element 6 (and in general before the closure element 6 is rotated relative to the retaining ring 5 to move to the open position) faces the retaining section 501 of the retaining ring 5. In in particular, the edge 50 is formed by a notch line 21.

In accordance with the invention, the connecting section 8 has on the outside a protrusion 31 which protrudes from the connecting section 8 itself and is located between the separation plane in which the dividing line 4 runs and the scoring line 21, so that when the closing element 6 is in the open position and the connecting strips 29, 30 keep the closure member 6 connected to the retaining ring 5, the edge 50 of the connecting portion 8, which in the closed position faces the retaining ring 5, in the open position faces towards the rim 18b of the neck 18, and the protrusion 31 abuts the neck 18 in the specified open position.

In more detail, the protrusion 31 is located at least partially between the Central segment 24 of the line 21 of the notch, facing the connecting section 8, and the separation plane.

When the closing element 6 passes from the closed to the open position, the connecting section 8 is turned over relative to the neck 18. Thus, the edge 50, which in the closed position was facing the retaining ring 5, is located so that it faces towards the rim 18b of the neck 18, those. in the upward direction shown in Fig. 4 and 5.

The connecting strips 29 and 30, which are designed to be deformable, undergo torsional movement as the closure moves from a closed to an open position, which can affect at least one part of the axial dimension of each connecting strip, defined as the size of the connecting strip along a line parallel to said axis. , in the closed position of the closing element.

The protrusion 31 acts in concert with the reversal of the connecting section 8 and can ensure the stability of the closing element 6 and locking it on the neck 18, preventing the connecting strips 29 and 30 from twisting in the opposite direction.

As already mentioned, the connecting section 8 extends through an angle around the Z-axis of the side wall 2 that is greater than or equal to 20° and less than or equal to 120°, preferably greater than or equal to 25° and less than or equal to 90°.

Thus, the connecting section 8 is not too wide with respect to the Z-axis of the side wall, which makes it difficult to turn over the connecting section 8, i.e. the transition of its edge 50 from the configuration facing the holding portion 501 to the configuration facing towards the rim 18b of the neck 18.

At the same time, the connecting section 8 is not too narrow with respect to the axis of the side wall 2, which may create interference between the connecting section 8 and the neck 18, which is not enough to hold the closing element 6 stably in the open position.

It should be noted that the protrusion 31 protrudes from the base of the side wall 2, which extends through a corresponding angle having a dimension with respect to the Z-axis that is greater than or equal to 4° and less than or equal to 90°. The term base of protrusion 31 m refers to the area of side wall 2 from which protrusion 31 protrudes.

Preferably, the protrusion 31 is located in the center of the connecting section 8, i. e. centered relative to the plane containing the Z-axis and the center line of the connecting section 8.

The protrusion 31, as shown in FIG. 1 has a top wall 31' which, in the closed position, faces towards the transverse wall 3, a bottom wall 31 m, which, in the closed position, faces towards the free edge 16, and an end edge 31'', which is the end edge of the projection 31. .

The protrusion 31 may have a thickness greater than or equal to 0.4 mm and less than or equal to 4 mm.

In this regard, the thickness of the protrusion 31 may be appropriately selected, as described in more detail below, in order to be able to select a location where it is preferable for the protrusion 31 to come into contact with the neck 18.

The thickness of the protrusion 31 is measured in the closed position along a line parallel to the Z axis.

The thickness of the protrusion 31 may be constant along the entire angular extent of the protrusion 31 relative to the Z axis, or the protrusion 31 may have a variable thickness relative to the Z axis.

Preferably, the protrusion 31 protrudes from the side wall 2 to a height that is less than or equal to 4 mm.

In the closed position, the height of the protrusion 31 is measured along a line transverse, in particular perpendicular to the Z axis, i.e. radially, assuming that the side wall 2 has a cylindrical shape.

The height may be constant over the entire angular extent of the projection 31 about the Z axis, or the height of the projection 31 may be variable over the entire angular extent of the projection 31 around the Z axis to define the projection 31 having an end edge 31''' that is concave or convex, or intermittent or flat.

For example, the end edge 31''' may lie in a plane and therefore be flat, while the height of the protrusion 31 along the end edge 331''' will be different relative to the Z axis.

As shown in FIG. 14-16, the end edge 31''' of the projection 31 may have a concave shape.

The end edge 31''' may be continuous as shown in FIG. 14, or as shown in FIG. 15, it may be intermittent.

In other words, the protrusion 31 may have sections, with some sections 34' having a predetermined height, and other sections 34" having a height close to 0, and located between two sections 34" with a predetermined height, so that the protrusion 31 has an end edge 31' '' which breaks but generally has the required form.

In order for the end edge 31''' to have the concave and discontinuous shape shown in FIG. 15 and 16, each section 34" having a predetermined height, which may be variable in the angular direction. However, alternatively, according to another variant not shown, each section 34' may have a corresponding straight end edge section, but this section has a height that is variable between different sections 34'.

If the portions 34" having a height close to 0 also have a thickness of 0, this means that the protrusion 31 has areas where it is absent in the angular direction.

As shown in FIG. 17 and 18, the end edge 31''' of the protrusion 31 differs from that shown in FIG. 14-16, as it has a convex shape.

The end edge 31''' may be continuous as shown in FIG. 17, or as shown in FIG. 18, it may be discontinuous and may have sections 34, similar to what has already been indicated and will not be repeated in more detail here, where some sections 34'' have a predetermined variable height, and other sections 34''' have a height close to 0 , so that the protrusion 31 has an end edge 31''' which is discontinuous, but generally has the desired shape, convex in this case.

The thickness of the protrusion 31 may be variable in height. For example, in one embodiment, not illustrated in the drawings, the protrusion 31 may be tapered and have an end edge 31''' with a reduced thickness compared to the thickness of the protrusion 31 at the base, despite the fact that the thickness remains constant throughout the angular extent of the protrusion. about the Z axis.

For example, in another embodiment, not illustrated in the drawings, the protrusion 31 may have corresponding beveled or rounded edges between the top wall 31'' and the end edge 31''' and/or between the end edge 31''' and the bottom wall 31'' ' to improve ergonomics and avoid sharp edges that may cause discomfort to the user.

The protrusion 31 is preferably elongated at an angle, i.e. has an angular extent about the Z-axis, which determines the length of the protrusion 31, exceeding its thickness. However, the thickness and/or height and/or length may be appropriately selected.

Considering the closing element 6 in the closed position, the position of the protrusion 31 in the connecting section 8 can be moved in the axial direction along a line parallel to the Z axis, i.e. the protrusion 31 may be located closer to the dividing line 4 or closer to the notch line 21, depending on the type of cap 1 or the type of neck 18 for which the cap is intended.

If the protrusion 31 is located closer to the notch line 21 than to the dividing line 4, as shown in FIG. 4, the end edge 31''' of the protrusion 31 is arranged to rest against the neck 18, for example above the extension 23 or on the top wall 23a of the extension 23, in an open position.

On FIG. 4, it can be seen that the end edge 31''' comes into contact with the neck just above the top wall 23a of the extension 23.

Thus, when the closing element 6 passes from the closed to the open position, the connecting section 8 is inverted relative to the neck 18, and the end edge 31''' of the protrusion 31 rests against the neck 18, locking the closing element 6.

On the contrary, in Fig. 3 shows an embodiment of a cover 1 in which the protrusion 31 is closer to the separating line 4 than to the notch line 21. Indeed, the bottom wall 31" of the protrusion 31 can be located under the extension 23 in an open position, for example, to ensure contact with the bottom wall 23b of the extension 23.

Thus, the protrusion 31 is blocked on the neck 18, since the axial movement of the protrusion 31 in the direction of the rim 18b of the neck 18 itself is prevented.

On the contrary, in Fig. 6 shows another embodiment of the cover 1, in which the protrusion 31 is located in the axial direction in the connecting section 8 between the dividing line 4 and the notch line 21 so that the end edge 31''' of the protrusion 31 is in contact with the outer end 23 of the extension 23 in open position.

Thus, the protrusion 31 is blocked on the neck 18, since the connecting section 8 is made with the possibility of overturning relative to the neck 18, and the end edge 31''' of the protrusion 31 comes into contact with the outer end 23 of the expansion 23.

Thus, by choosing the axial position of the protrusion 31 in the side wall 3, it is possible to position the protrusion 31 above or below, or at the outer end 23 of the extension 23.

The protrusion 31 has a plane of symmetry which is transverse, for example perpendicular, to the Z-axis when the closure element 6 is in the closed position. In other words, the protrusion 31 protrudes perpendicularly outward from the connecting section 8.

Between the protrusion 31 and the dividing line 4, and between the protrusion 31 and the notch line 21, the first distance and the second distance are measured, respectively, which are the distances between the plane of symmetry of the protrusion 31 and the plane in which the dividing line 4 lies, and between the plane of symmetry of the protrusion 31 and the plane , in which the notch line 21 lies.

The protrusion 31 is closer to the dividing line 4 if the specified second distance is greater than the specified first distance, and the protrusion 31 is closer to the notch line 21 if the specified first distance is greater than the specified second distance.

In use, when the user wishes to open the container for the first time, he grasps the side wall 2 of the closure 6 and rotates the closure 6 about the Z axis to unscrew the closure 6 from the mouth 18. First, the closure 6 and the retaining ring 5 rotate together about the Z axis. and simultaneously move together along a line parallel to the Z-axis away from the neck 18. This occurs as long as the engaging member 20 of the retaining ring 5 is in contact with the circular expansion 23 made on the neck 18. At this point, the circular expansion 23 prevents lifting the retaining ring 5 further along the Z axis, acting as a stop to move the retaining ring 5 away from the neck 18.

The closing element 6, which is unscrewed by the user, continues to move along the Z axis from the neck 18. In this way, the breakable bridges are tightened until they are broken. As a result, the closing element 6 is separated from the retaining ring 5 along the separating line 4, but remains connected to the retaining ring 5 in the connecting section 8.

If the user continues to unscrew the closing element 6 to move this element 6 along the Z axis to remove it from the neck 18, the first and second connecting strips 29, 30 are deformed. In particular, when the closure element 6 is moved upwards, the first strip 29 and the second strip 30 are also pulled upwards. Thus, the first strip 29 and the second strip 30 are separated from both the closure element 6 and the retaining ring 5 and remain connected to each other in the connecting section 8.

Thus, the first and second connecting strips 29, 30 take the form of a trapezoid, as shown in FIG. 3. In this configuration, the first connecting strip 29 remains connected to the retaining ring 5 at the end 27 of the score line 21. Similarly, the second connecting strip 30 remains connected to the retaining ring 5 at the other end 28 of the score line 21.

In other words, the first bonding strip 29 and the second bonding strip 30 are arranged in an oblique configuration with respect to the retaining ring 5 and converge at the bonding portion 8 as shown in FIG. 3.

By continuing to unscrew the closing element 6, it is detached from the external thread 17 provided on the neck 18 so that the container can be opened. The retaining ring 5, especially the connecting section 501, on the other hand, remains fixed on the neck 18. The first connecting strip 29, the second connecting strip 30 and the connecting section 8 form a pivoting means, not shown in the drawing, around which the closing element 6 can be rotated in order to the user could access the contents of the container.

In particular, by moving the closure element 6 relative to the pivot means after the closure element 6 has been detached from the neck 18, it is possible to move the closure element 6 to a lateral position relative to the neck 18, so that the closure element 6 is no longer coaxial with the retaining ring 5. It is possible pivoting the closure 6 further back to move it further away from the neck 18 and to provide the user with easier access to the contents of the container.

During the transition to the open position, the connecting strips 29 and 30 perform a movement that is at least partially twisting, and the protrusion 31 acts together with them and with the turning over of the connecting section 8, blocking the closing element 6 on the neck 18, since it prevents the connecting elements from making bands 29 and 30 twisting movement in the opposite direction.

The protrusion 31 in contact with the extension 23, as mentioned above, that is, when it is placed against the upper wall 23 a, or in contact with the lower wall 23 b or the outer end 23 c, blocks the closing element 6 on the neck 18.

After use, the user can return the lid 1 to the closed position shown in FIG. 1 using the reverse order of operations as described above.

The first connecting strip 29 and the second connecting strip 30 form a turning means which is longer than that which would be possible if only the turning strip formed by the connecting section 8 were present. , if the protrusion rested on the neck 18 or extension 23, or detachment of the protrusion 31 from the bottom of the extension 23 or from its outer end 23 s, if the protrusion 31 was hooked from the bottom of the extension 23 or at its outer end 23 s, to re-put on the closing element 6 on the neck 18 by turning the closing element 6 around the turning means.

In this way, the user can advantageously perceive when the projection 31 is stably engaged with the extension 23 both when moving from the closed to the open position and vice versa when moving from the open to the closed position.

On FIG. 9-13 show a cover 101 according to another embodiment.

Parts of the lid 101 common to the lid 1 described with reference to FIG. 1-8 will be denoted by the reference numerals already used in FIG. 1-8, and for brevity will not be described again in more detail. What has been described above with reference to the lid 1 should be understood to apply to the lid 101 unless the differences are explicitly stated.

According to this embodiment, the lid 101 differs from the lid 1 described above in that the connecting section 8 comprises a web 32 which protrudes towards the free edge 16.

Indeed, the lid has a notch line 21' which in turn comprises a central segment 24' located between a peripheral segment 25' and another peripheral segment 26', the peripheral segment 25' and the other peripheral segment 26' being aligned with each other, transverse to the axis Z and extend in a first plane which is parallel to the separation plane when the cover 101 is in the closed position.

The central section 24' extends in a second plane, parallel to the separation plane, which is located between said first plane and the free edge 16 of the retaining ring 5. Thus, the central section 24' forms the lower edge 32a of the web 32, which is formed in the side wall 2 and protrudes along towards the free edge 16, protruding relative to the connecting strips 29, 30.

The web 32 also has two side edges 32b, shown at least in FIG. 10 bounded by a pair of cuts 33 made on the side wall 2 which extend from opposite ends of the central section 24' towards the transverse wall 3. The cuts 33 shown in FIG. 1 run parallel to the Z-axis and are therefore perpendicular to the bottom edge 32a of web 32.

Along the circumference between the upper ends of the slits 33 is a turning line 32 c, around which the bridge 32 can be bent. It should be noted that the pivot line 32c is an imaginary line which in the side wall 2 defines a zone against which the web 32 can be bent, for example when changing from a closed to an open position. On the contrary, when the closing element 6 is in the open position and rotated relative to the neck 18 with support on the neck 18 near the expansion 23, the bridge 32 is not bent and remains in line with the closing element 6.

In other words, the connecting section 8 has a web 32 located between the connecting strips 29, 30, which protrudes towards the free edge 16 and can be bent around the turning line 32c.

The cuts 33 also limit the axial dimension of web 32, that is, the size of web 32 along a line parallel to the Z axis.

The cuts 33 can extend in the connection zone 8 up to the separation plane or even alternatively inside the closing element 6 if the web 32 is to have a particularly large axial dimension.

The protrusion 31 can be at least partially located in the bridge 32, that is, located in the connecting section 8 so that a part of the protrusion 31 is located along an axis parallel to the Z axis, between the side edges 32b of the bridge 32. However, preferably, the protrusion 31 is also may be located within the bridge 32, that is, the protrusion 31 may be completely enclosed in the bridge 32, as shown in FIG. 9-13.

Here again, as already described in detail, the protrusion 31 may be located closer to the notch line 21' than to the separating line 4, or closer to the separating line 4 than to the notch line 21'. What has been said above with respect to said first distance and said second distance applies here as well to determine whether the protrusion 31 is closer to the dividing line 4 or to the notch line 21'.

When the lid is in the closed position, the protrusion 31 may be located closer to the central segment 24' of the notch line 21' which defines the lower edge 32a of the bridge 32, or closer to the separation plane.

The protrusion 31 may be located closer to the lower edge 32a of the bridge 32 than to the dividing line 4, so that the end edge 31''' of the protrusion 31 may be positioned against the neck 18 in an open position, for example, above the extension 23 or on the top wall 23a extensions 23.

The protrusion 31 can also be located closer to the dividing line 4 than the lower edge 32a of the bridge 32, so that the bottom wall 31'' of the protrusion 31 can be located under the expansion 18, for example, to ensure contact with the bottom wall 23b of the expansion 23.

Alternatively, protrusion 31 may be positioned such that, in the open position, it engages outer end 23 of flare 23.

It should be noted that between the protrusion 31 and the side edges 32b of the web 32, a frame can be located that surrounds the protrusion 31. In other words, the protrusion 31 is located at a distance from the side edges 32b, and there is a free frame delimited by the side edges 32b and the bottom edge 32a.

However, depending on the type of technology used to make the score line 21, there may be an axial distance of 0 or greater than 0, for example, preferably greater than or equal to 0.3 mm.

Preferably, the plane of symmetry of the protrusion 31 is parallel to the bottom edge 32a of the web 32, which are perpendicular to the Z axis. In other words, the protrusion 31 protrudes perpendicularly from the web 32.

With regard to the shape of the protrusion 31 in the web 32, what has been said above applies here, i.e. the protrusion 31 can have a variable height in the angular direction, for example, to make the web continuous, or convex, or, if necessary, even discontinuous, as shown in FIG. 14-18.

Even the thickness of the protrusion 31 in the web 32 can be variable in the angular direction, just as the thickness can be variable in height to provide a protrusion whose end edge 31''' has a conical or, for example, bevelled shape.

Thanks to the cover 101, in which the protrusion 31 is located in the bridge 32, it is possible to block the closing element 6 even more in the open position.

The presence of the bridge 32 and the projection 31 in the bridge 32 allows the projection 31 to be positioned even further towards the free edge 16, with the lower edge 32a protruding from the connecting strips 29, 30 and thus providing greater freedom to block the closure element 6 with respect to the neck 18 .

In use, the cover 101 is in the open position as described above and the first connecting strip 29 remains connected to the retaining ring 5 at one end 27 of the peripheral length 25' of the notch line 21', and similarly the second connecting strip 30 remains connected to the retaining ring 5. ring 5 at the other end 28 of another peripheral segment 26' of the score line 21.

During the transition from the closed to the open position, the connecting strips 29 and 30 undergo a torsional movement, and the connecting section 8 can flip up, moving the lower edge 32a of the bridge 32 towards the rim 18b. Since the web 32 protrudes relative to the connecting strips 29, 30 and since the protrusion 31 is perpendicular to the web 32, the protrusion 31 can rest against the neck 18 while the connecting strips 29, 30 are deformed.

More specifically, the end edge 31''' of the protrusion 31 comes into contact with the neck 18 in a position which depends on the position of the protrusion 31 relative to the separating line 4 and the notch line 2D, more specifically relative to the central segment 24' of the notch line 21'.

If, for example, the protrusion 31 is located closer to the lower edge 32a of the web 32 than to the dividing line 4, the end edge 31''' of the protrusion may be positioned against the neck 18 in an open position, for example, on the upper wall 23a of the extension 23. On the contrary if, for example, the protrusion 31 is closer to the dividing line 4 than the lower edge 32a of the bridge 32, then in the open position it can be located under the extension 23, for example, to ensure contact with the bottom wall 23b of the extension 23 or contact with the outer end 23 from extension 23.

In addition, the flexibility of the web 32 provides improved contact between the lip 31 and the neck 18, as the lip 31 can be better adapted to the shape of the neck 18.

This improves the stability of the blocking of the closing element 6 on the neck 18, even in the presence of necks 18 having special dimensions and/or shapes.

The closing member 6 can be stably held in the open position. Indeed, in order to return the closing element 6 to the closed position, it is necessary to overcome the interference between the connecting section 8 and the neck 18, that is, between the projection 31 and the neck 18. In the normal state, this does not happen by chance, but only if the user has deliberately applied enough force to the closing element 6, i.e. if the user wishes to move the closing element 6 to the closed position.

In addition, the fact remains that the interference between the protrusion 31 and the neck 18 makes it difficult to rotate the cover 101 around the neck 18 due to the rotation of the retaining ring 5 around the neck 18. Indeed, the retaining ring 5 is connected to the connecting section 8 by connecting strips 29 , 30. Thus, the free rotation of the retaining ring 5 around the neck 18 is prevented, instead, its rotation is ensured only if the obstacles between the projection 31 and the neck 18 are overcome.

As already mentioned, the side wall 2 may have notches 13.

The dividing line 4 can cross the notches 13. In other words, the notches 13 can extend on both sides, i.e. both above and below the dividing line 4. However, the dividing line 4 can also be made in the part of the side wall 2 that is limited on the outside with a substantially smooth outer surface.

This is because the dividing line 4 is located as close as possible to the removable fasteners located inside the closing element 6, that is to say, to the internal thread. Thus, it is possible to increase the axial dimension of the connecting strips 29, 30.

As already mentioned, when the user wishes to close the container again, the closure element 6 can be returned to the closed position by the reverse sequence of operations as described above. In particular, the user rotates the closure element 6 relative to the neck 18 to return it to the closed position. Accordingly, the connecting section 8 is also rotated to return the edge 50 or bottom edge 32a of the web 32 under the connecting strips 29, 30 to a position directed towards the holding section 501. or feedback, which may (but need not) be accompanied by a click sound. In this way, the user can understand that the closure 6 is ready to be re-screwed onto the neck 18. Indeed, a disengagement position has been reached, from which the closure 6 can be screwed back onto the neck 18 to move it again to the closed position.

As already mentioned, the thickness of the protrusion 31 can be appropriately selected depending on what interference with the neck 18 is required.

On FIG. 19-23 show a lid that is different from the lid described with reference to FIG. 1-6 in that it has a projection 31 which is thicker than the projection 31 of the cover shown in FIG. one.

For this type of lid, all the previous considerations regarding the lid shown in FIG. 1-6, as well as all the options described for the shape of the protrusion 31 shown in FIG. 14-18.

On FIG. 21 shows a protrusion 31 designed so that the end edge 31''' can be positioned to rest on the neck 18, for example, above the extension 23 or on the top wall 23a of the extension 23 in the open position.

On FIG. 22 shows a variant of the closure in which the thickness of the protrusion 31 and/or the position of the protrusion is such that the bottom wall 31'' of the protrusion 31 can be positioned under the extension 23 in an open position, for example to contact the bottom wall 23b of the extension 23.

On FIG. 23 shows a variant of the lid, in which the thickness of the protrusion 31 and/or the location of the protrusion is such that the end edge 31'' of the protrusion 31 can be positioned substantially parallel to the Z axis and can come into contact with the outer end 23 of the extension 23 in the open position.

In addition, in FIG. 24-28 show a lid 101 which is different from the lid 101 shown in FIG. 9-12 in that it has a projection 31 that is thicker than the projection 31 of the cover shown in FIG. 9.

For lid 101, all of the considerations given above for the lid shown in FIG. 9-12 as well as the variations described for the shape of the protrusion 31 shown in FIG. 14-18. As shown in FIG. 25, the protrusion 31 is completely within the web 32 and has a thickness that is approximately equal to half the axial dimension of the web 32.

If the projection 31 is located on the bridge 32, then the thickness of the selected projection 31 may be significant. Indeed, the lower edge 32a of the web 32 can extend beyond the connecting strips 29, 30 up to the free edge 16 of the lid.

Indeed, it should be noted that, as shown in FIG. 26, the end edge 31''' of the protrusion 31, which has an increased thickness, is made with the possibility of being located on the neck 18, ensuring contact with both the upper wall 23a of the expansion 23, and with the outer surface 18a of the neck 18 above the expansion 23.

On FIG. 27 shows a variant of the closure in which the thickness of the protrusion 31 and/or the position of the protrusion are such that the bottom wall 31'' of the protrusion 31 can be positioned under the extension 23 in an open position, for example to contact the bottom wall 23b of the extension 23.

On FIG. 28 shows another embodiment of the lid, in which the thickness of the protrusion 31 and/or the location of the protrusion is such that the end edge 31''' of the protrusion 31 can be located essentially parallel to the Z axis and can come into contact with the outer end 23 of the extension 23 in the open position . Due to the increased thickness, the top wall 31'' of the protrusion 31 can be positioned to rest on the holding portion 501.

Both the lid 1 and the lid 101 are particularly easy to manufacture.

The method for manufacturing the cap 1 or 101 includes the following steps:

- production of a concave body containing a side wall 2, passing around the Z-axis, and a transverse wall 3 located at the edge of the side wall 2,

- cutting on the side wall 3, which extends around the Z-axis, a dividing line 4 to delimit a retaining ring 5 configured to remain attached to the mouth 18 of the container, and a closure element 6 which is configured to be removably engaged with the mouth 18 for opening or closing container, and

- the step of cutting the dividing line 4 includes interrupting the cut between the first end 9 and the second end 10, in order to keep the retaining ring 5 and the closure element 6 connected at the connecting section 8. The method of manufacturing the lid includes other steps:

- cutting the notch line 21, 21', which runs transversely to the Z axis between the separating line 4 and the free edge 16 of the retaining ring 5, so that between the separating line 4 and the notch line 21, 21' two connecting strips 29, 30 are formed, which connect the retaining ring 5 with connecting section 8,

- execution on the outer side of the connecting section 8 of the protrusion 31, which protrudes from the connecting section 8,

- obtaining a dividing line 4 and/or a notch line 21, 21' by a cutting operation carried out using appropriate blades, for example round or linear, which remain fixed and interact with the side wall 2 when the concave body is rotated, or which are rotated, while while the concave body remains motionless.

The concave body can be made by injection molding a polymeric material, such as compression molding or injection molding.

After the formation of the concave body on the side wall 2, a separating line 4 and a notch line 21 or 21' are made.

The cutting operations for making the separating line 4 and the notching lines 21, 21' can be performed, for example, in a cutting block located downstream of the mold in which the concave body was made. Such cutting operations can be carried out with appropriate blades, for example circular or linear, which interact with the side wall 2 from the outside or from the inside. In particular, the concave body can be rotated about the Z-axis of the side wall 2 while the blades remain stationary to move successive zones of the side wall 2 to engage one after the other with the blades. It is also possible to hold the concave body stationary so that the blades can be rotated to make a cut.

The blades which provide the separating line 4 and the score line 21, 21' can be configured to engage with the side wall 2 in appropriate parallel planes, for example perpendicular to the Z axis, if, as in the required examples, the separating line 4 and the line 21 , 21' notches lie in respective parallel planes.

The blades can have a discontinuous cutting edge if breakable bridges 7 are to be formed along the dividing line 4 and/or if corresponding breakable elements are to be formed along the notch line 21, 21'.

It is also possible that the blades do not cut through the entire thickness of the side wall 2, but only partially cut through the thickness of the side wall 2 to form along the notch line 21, 21' and/or along the dividing line 4 a thin membrane intended to be torn when the lid is first opened.

The separating line 4 and the notching line 21, 21' can be made simultaneously or in two separate steps.

The protrusion 31 protruding from the concave body can be obtained with an undercut portion.

The bridge 32 can be obtained by making a notch line 21' as described above, since the central segment 24' and the peripheral segments 25' and 26' lie in parallel planes. In contrast, the break lines 33 can be made with additional blades that are configured to engage with the side wall 2 from the outside of this wall or from the inside to cut it along a line parallel to the Z axis. Thus, as in the case of the line 21' notch, rupture elements may be limited along the fault line 33, or a thin membrane may be left to rupture when the lid is first opened.

Therefore, the lid 1 and the lid 101 are particularly easy to manufacture, since the concave body can be made in a conventional injection mold with an undercut portion.

Additional operation, i.e. making the notch line 21 can be done very simply by forming the dividing line 4.

According to another embodiment, not shown in the drawing, the lid may comprise a web 32 formed by a notch line in which the central segment, when the lid is in the closed position, lies in the same plane as the peripheral segment and the other peripheral segment. Thus, the lower edge 32a of the protrusion is aligned with the connecting strips 29, 30 and, more specifically, with the free lower edge of the strip 29 and with the other free lower edge of the other strip 30.

For a given type of cover, the axial size of the web is determined by the length of the cuts 33 that extend from opposite ends of the central segment.

The cover 1 described above is made of a plastic material such as polypropylene (PP) or polyethylene (PE).

When using polyethylene, its density can vary from low to high. More specifically, high density polyethylene (HDPE) may be used.

The high-density polyethylene (HDPE) used to make the closure described above may have the following properties:

- density variation from 950 to 968 kg/m3 ^,

- melt index variation from 0.3 to 20 g under the following measurement conditions: 10 minutes at 190°C, 2.16 kg,

- large, or narrow, or unimodal, or multimodal distribution of molecular weight.

When using polypropylene, the material may be in the form of a homopolymer, or a heterophasic copolymer, or a random copolymer.

The melt index of polypropylene can vary from 2 to 20 g under measurement conditions: 10 minutes, 230° C., 2.16 kg, in the zone of the central cut.

Claims (33)

1. Lid for a container, containing a side wall (2) passing around the axis (Z), and a transverse wall (3) located at the edge of the side wall (2), and on the side wall (2) there is a dividing line (4) for restrictions: a retaining ring (5) which is configured to remain attached to the neck (18) of the container and to be internally engaged with the extension (23) of the neck (18), and a closing element (6) made with the possibility of removable engagement with the neck (18) for opening or closing the container, moreover, the dividing line (4) runs around the indicated axis (Z) and is interrupted in the circumferential direction so that between the retaining ring (5) and the closing element (6) there remains a connecting section (8), which extends in the circumferential direction at a corresponding angle, while the cover (1, 101) also contains a line (21, 21') of the notch, which runs transversely to the specified axis (Z) between the dividing line (4) and the free edge (16) of the retaining ring (5), so that between the separating line 4 and the notch line (21, 21') two connecting strips (29, 30) are delimited, which connect the retaining ring (5) with the connecting section (8), while the connecting strips (29, 30) are deformable to enable the connecting section (8) to rotate when the closing element (6) is moved from the closed position to the open position, moreover the connecting section (8) has a protrusion (31) on the outside, which protrudes from the connecting section (8) and is located between the separation plane, in which the dividing line (4) passes, and the notch line (21, 21') so that when the closing element (6) is in the open position and the connecting strips (29, 30) keep the closing element (6) connected to the retaining ring (5), the edge (50) of the connecting section (8), which in the closed position faces the retaining ring (5) , in the open position, faces towards the rim (18b) of the neck (18), with the protrusion (31) abutting the neck (18) in said open position. 2. Lid according to claim 1, wherein the protrusion (31) extends around said axis (Z) through an appropriate angle which is greater than or equal to 4° and less than or equal to 90°. 3. Lid according to claim 1 or 2, in which the thickness of the protrusion (31) is greater than or equal to 0.4 mm and less than or equal to 4 mm. 4. Lid according to claim 3, in which said thickness is measured along a line parallel to said axis (Z), when the closing element (6) is in the closed position and is constant along the entire angular extent of the protrusion (31) around said axis (Z) . 5. Lid according to one of the previous claims, in which the protrusion (31) is located closer to the line (21, 21') of the notch than to the dividing line (4), so that the end edge (31''') of the protrusion (31) can be positioned resting on the neck (18) in an open position, for example above the extension (23) or resting on the top wall (23a) of the extension (23). 6. Cover according to one of paragraphs. 1-4, in which the protrusion (31) is located closer to the dividing line (4) than to the notch line (21, 21'), so that the lower wall (31'') of the protrusion (31), which in the closed position faces the towards the free edge (16), may be located below the expansion (18), for example, to ensure contact with the bottom wall (23b) of the expansion (23). 7. Lid according to claim 5 or 6, in which the protrusion (31) has a plane of symmetry passing transversely, for example, perpendicular to the specified axis (Z), when the closing element (6) is in the closed position, while between the protrusion (31) and the dividing line (4) and between the protrusion (31) and the notch line (21, 21') there is respectively a first distance and a second distance, which are the distances respectively between the symmetry plane and the separation plane and between the symmetry plane of the protrusion (31) and the plane, in which the notch line (21, 21') passes, and the protrusion (31) is closer to the dividing line (4), if the second distance is greater than the first distance, and the protrusion (31) is closer to the notch line (21, 21'), if the first distance is greater than the second distance. 8. Lid according to one of the previous paragraphs, in which the line (21) of the notch contains a central segment (24), which is located between one peripheral segment (25) and another peripheral segment (26), wherein said one peripheral segment (25) and the other the peripheral segment (26) are aligned with each other, located transversely to the indicated Z axis and extend in the first plane, which is parallel to the separation plane when the lid is in the closed position, and in which the central segment (24) is also located, while the protrusion (31) located between the central segment (24) and the separation plane. 9. The lid according to claim 8, which has two cuts that extend from opposite ends of the central segment (24) in the direction of the transverse wall (3), and the lid contains a jumper, the lower edge of which is formed by the central segment (24), the side edges of which are made through cuts to form a web, the lower edge of which is aligned with the connecting strips (29, 30), while the protrusion (31) is at least partially located in the web (32). 10. Cover according to one of paragraphs. 1-7, in which the line (21') of the notch contains a central segment (24'), which is located between one peripheral segment (25') and another peripheral segment (26'), wherein said one peripheral segment (25') and the other the peripheral segment (26') are aligned with each other, located transversely to the specified Z-axis and extend in the first plane parallel to the separation plane when the lid is in the closed position, the central segment (24') extending in the second plane parallel to the separation plane, which is located between the specified first plane and the free edge (16) of the retaining ring (5), while the cover contains a jumper (32), which extends in the direction of the free edge (16) and protrudes relative to the connecting strips (29, 30), and the specified central segment (24') delimits the lower edge (32a) of the bridge (32), and the protrusion (31) is at least partially located in the bridge (32). 11. The lid according to claim 10, which has two cuts (33), which are made on the side wall (2), when the lid is in the closed position, run parallel to the specified axis (Z), starting from opposite ends of the specified central segment (24') , in the direction of the transverse wall (3) and limit the respective side edges (32b) of the bridge (32). 12. Cover according to one of paragraphs. 9-11, in which the protrusion (31) is located closer to the lower edge (32a) of the bridge (32) than to the dividing line (4), so that the end edge (31''') of the protrusion (31) can be positioned with support on the neck (18) in the open position, for example, above the extension (23) or supported by the top wall (23a) of the extension (23). 13. Cover according to one of paragraphs. 9-11, in which the protrusion (31) is located closer to the dividing line (4) than to the lower edge (32a) of the bridge (32), so that the lower wall (31'') of the protrusion (31), which in the closed position faces in the direction of the free edge (16), can be located below the extension (18), for example, to ensure contact with the bottom wall (23b) of the extension (23). 14. Lid according to one of the preceding claims, in which the protrusion (31) protrudes from the connecting section (8) to a height measured along a line transverse, in particular perpendicular, to the indicated axis (Z) when the closing element (6) is in the closed position , and the specified height is constant over the entire angular extent of the protrusion (31) around the specified axis (Z). 15. Cover according to one of paragraphs. 1-13, in which the protrusion (31) protrudes from the connecting section (8) to a height measured along a line transverse, in particular perpendicular, to the specified axis (Z) when the closing element (6) is in the closed position, and the specified height is variable over the entire angular extent of the protrusion (31) around the specified axis (Z), limiting the protrusion (31) having an end edge (31'''), the shape of which is concave, or convex, or intermittent, or flat. 16. Lid according to claim 15, in which the protrusion (31) contains sections located around the specified axis (Z), and some sections (34') have a predetermined height, which can vary around the specified axis (Z), and other sections ( 34'') have a height equal to 0 and are located between two sections (34'') with a given height, so that the end edge (31''') of the protrusion (31) is interrupted, but generally has the desired shape. 17. Lid according to one of the preceding claims, in which the protrusion (31) protrudes from the connecting section (8) to a height measured along a line transverse, in particular perpendicular, to the specified axis (Z) when the closing element (6) is in the closed position , wherein said height is less than or equal to 4 mm. 18. Lid according to one of the preceding claims, in which the extension angle of the connecting section (8) is greater than or equal to 20° and less than or equal to 120°, preferably greater than or equal to 25° and less than or equal to 90°. 19. A method of manufacturing a cover (1, 101), made according to one of paragraphs. 1-18, and the method includes the following steps: production of a concave body containing a side wall (2) passing around the specified axis (Z), and a transverse wall (3) located at the edge of the side wall (2), cutting on the side wall (3) of the dividing line (4) that runs around the specified axis (Z) to limit the retaining ring (5) made with the possibility of remaining attached to the mouth (18) of the container, and the closing element (6), which is made with the possibility of removable engagement with the neck (18) for opening or closing the container, moreover, the step of cutting the dividing line (4) includes interrupting the cut between the first end (9) and the second end (10) in order to leave the retaining ring (5) and the closing element (6) connected in the connecting section (8), wherein the method for manufacturing the cap also includes the following steps: cutting line (21, 21') of the notch, which runs transversely to the specified axis (Z) between the dividing line (4) and the free edge (16) of the retaining ring (5) with the formation between the dividing line (4) and the line (21, 21' ) notching two connecting strips (29, 30) that connect the retaining ring (5) with the connecting section (8), execution on the outer side of the connecting section (8) protrusion (31), which protrudes from the connecting section (8), obtaining a separating line (4) and/or a notch line (21,21') by cutting operations using appropriate blades, for example round or linear, which are held stationary and they interact with the side wall (2) when the concave body is rotated, or which cause rotation while the concave body is held stationary.

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