ES2944289T3 - Safety ring for containers - Google Patents

Abstract

A circlip (100) for closing a container (105), wherein said container (105) comprises an opening (110), an annular rim (120) surrounding and radially protruding from said opening (110) and a lid (125) capable of closing said opening (110) and having a perimeter edge (130) capable of resting on the annular rim (120), wherein the safety ring (100) comprises: a curved band (140) that extending about a predetermined central axis (X) and having first and second end portions (160, 165) superimposed on one another, a clamping device (195) operable to make said end portions (160, 165) ) slide in a circumferential direction, keeping them in mutual overlap, between an open configuration, in which the overlap of said end parts (160, 165) is minimal and the diameter of the curved band (140) with respect to the central axis ( X) is maximum, and a closure configuration, where the superposition of said end portions (160, 165) is maximum and the diameter of the curved band (140) is minimum, and where said curved band (140) presents a lateral strip (155), substantially cylindrical. shaped, capable of surrounding the annular flange (120) of the container (105), a first circumferential edge (145) that protrudes radially inward with respect to the lateral strip (155), which is adapted to overlap the perimeter edge (130) of the lid (125), and a second circumferential edge (150) foldable under the annular rim (120) of the container (105). Capable of surrounding the annular flange (120) of the container (105), a first edge circumferential (145) that protrudes radially inward with respect to the side strip (155), which is adapted to overlap the perimeter edge (130) of the lid (125), and a second circumferential edge (150) foldable under the annular rim (120) of the container (105). capable of surrounding the annular flange (120) of the container (105), a first circumferential edge (145) that protrudes radially inward with respect to the lateral strip (155), which it is adapted to overlap the perimeter edge (130) of the lid (125), and a second circumferential edge (150) foldable under the annular rim (120) of the container (105). (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Safety ring for containers

technique field

The present invention relates to a security ring for closing containers, typically metal containers, such as buckets, buckets or drums, comprising an opening and an annular rim that surrounds and radially protrudes from said opening. The invention also relates to a method for closing a container.

prior art

As is known, containers of the type described above can be used for the packaging and sale of various products, mainly in liquid form, including dangerous, harmful and/or polluting products such as acids, paints, thinners and the like.

After being filled with the product to be packaged, these containers are closed with a corresponding lid, which occludes the opening and has a perimeter edge that rests on the annular rim.

A circlip may be used to constrain the lid to the container together.

Typically, this circlip is made from a curved band, typically of metallic material, which extends circumferentially around a predetermined central axis.

The two end parts of the curved band are superimposed on each other and solidly fixed to each other, for example by welding, to obtain a closed ring having a diameter that corresponds to that of the annular rim of the container.

Subsequently, one of the circumferential edges of the ring is deformed so that it protrudes radially inwards, that is, towards the central axis of the band, giving the band a substantially square or L-shaped cross section.

At this point, the ring is fitted over the container, ensuring that the protruding circumferential edge abuts the perimeter edge of the lid, after which the opposite circumferential edge is deformed and folds under the annular rim of the container.

In order to allow the opening of the container, predefined fracture lines are previously made in the band, which allow the users to break and remove the security ring.

This solution has the advantage of obtaining a very stable and secure closing of the lid, but suffers from the drawback that the container can no longer be closed after removing the security ring.

To solve this drawback, open circlips have been proposed in the past, the end portions of which are spaced apart and connected to each other by means of a clamping device, which is capable of moving them closer to and further from each other in the circumferential direction, respectively, reducing or increasing the overall diameter of the circlip.

In this way, by actuating the tightening device, users can effectively widen the safety ring, in order to allow the removal of the lid and the opening of the container and, vice versa, replace the lid and tighten the ring again. security, in order to be able to guarantee re-closing the container. However, not all of these reclosable safety rings can always provide a sufficiently stable and secure locking of the lid in the most critical conditions, for example in case of accidental fall of the container from a height of more than one meter. From EP 0512408 A1, a safety ring is further known. Said document EP 0512408 A1 does not describe a circlip in which the end parts of the clamping device, in the opening configuration, overlap each other and in which the first circumferential edge of the curved band is folded into a curl and it has a cross section, provided with respect to a section plane that contains the central axis (X) of the curved band, of substantially circular or arc shape.

Description of the invention

In view of the above, an object of the present invention is to provide a reclosable security ring that can guarantee a more stable and secure locking of the lid on the container.

Another objective is to achieve the above objective in the context of a simple, rational and relatively affordable solution.

These and other objects are achieved by the features of the invention as set out in independent claim 1. The dependent claims describe preferred and/or particularly advantageous aspects of the invention.

In particular, one embodiment of the present invention provides a circlip for closing a container, said container comprising an opening, an annular rim surrounding and radially protruding from said opening and a lid adapted to close said opening and having a perimeter edge adapted to rest on the annular rim, in which the security ring comprises:

- a curved band that extends around a predetermined central axis and that has a first and a second end part that are superimposed on each other,

- a clamping device operable to make said end parts slide in a circumferential direction, keeping them superimposed on each other, between an opening configuration, in which the overlap of said end parts is minimal and the diameter of the curved band with respect to the central axis is maximum, and a closure configuration, in which the overlap of said end portions is maximum and the diameter of the curved band is minimum,

wherein said curved band presents a lateral strip, substantially cylindrical in shape, capable of surrounding the annular rim of the container, a first circumferential edge that protrudes radially inwardly with respect to the lateral strip, the circumferential edge of which is adapted to overlap on top of the peripheral edge of the lid, and a second circumferential edge that can be folded under the annular rim of the container and the first circumferential edge of the curved band being folded in a curl and presenting a cross section, proportioned with respect to a section plane containing the central axis (X) of the curved band, substantially circular or arc shaped.

Thanks to the presence of the clamping device, this security ring can advantageously be opened and closed several times, guaranteeing the possibility of reclosing the container even after the first opening.

On the other hand, since the two end portions of the curved band overlap each other, this circlip is quite rigid and stable.

In particular, the stress that tends to open the circlip is not only discharged onto the clamping device, but is also transmitted to the curved band, in particular via the mutually overlapping end portions.

In this way, the circlip is quite strong and can provide a fairly solid lock of the lid on the container, even when subjected to critical stress, for example in the event of a fall. Another important advantage of this situation consists in the fact that the first installation of the circlip can be done very quickly and can be easily automated, since it does not require manual intervention in the clamping device but only requires that the circlip is inserted into the container and the second end edge of the curved band folds under the annular rim.

According to the invention, the first circumferential edge of the curved band can be folded into a curl and can have a cross section, proportioned with respect to a section plane containing the central axis of the curved band, of substantially circular or spiral shape, or at least an arc of a circle or an arc of a spiral.

Thanks to this solution, the first circumferential edge of the safety ring defines a kind of completely hollow perimeter bead that, in the event of an impact, can be deformed (for example, crushed), absorbing part of the mechanical energy that would otherwise would be transmitted to the container, preserving and increasing the security of the closure.

According to another aspect of the invention, this first circumferential edge can have a first part that extends in the first end part of the curved band and a second part that extends in the second end part of the curved band, where said first part of the first circumferential edge can be slidably inserted into the second part.

In this way, the clamping ring acquires great strength and rigidity, especially in the radial direction, without, however, preventing the mutual sliding of the two end parts in the circumferential direction and, therefore, without compromising the operation or the advantages of the clamping device

Another aspect of the invention provides that the first end portion of the curved band may be devoid of the second circumferential edge.

In other words, the first end part of the curved band can have a notch, that is to say a shape, which reduces the height with respect to the other zones of the curved band and, in particular, with respect to the height of the curved band. the second end part.

In this way, in the section of mutual overlap between the two end parts, the lower circumferential edge of the security ring will, however, have a single thickness, simplifying its folding under the annular rim of the container.

Another embodiment of the present invention provides a container comprising an opening, an annular rim surrounding and radially protruding from said opening, a lid capable of closing said opening and having a perimeter edge adapted to rest on the annular rim, and a security ring, wherein said security ring comprises:

- a curved band that extends around a predetermined central axis and that presents a first and a second end part superimposed on each other, and

- a clamping device operable to make said end parts slide in a circumferential direction, keeping them superimposed on each other, between an opening configuration, in which the overlap of said end parts is minimal and the diameter of the curved band with respect to the central axis is maximum, and a closure configuration, in which the overlap of said end portions is maximum and the diameter of the curved band is minimum, and

wherein said curved band presents a lateral strip, substantially cylindrical in shape, that can surround the annular rim of the container, a first circumferential edge that protrudes radially inwardly with respect to the lateral strip, the circumferential edge of which is adapted to overlap on the peripheral edge of the lid, and a second circumferential edge that can be folded under the annular rim of the container.

Taking advantage of the new security ring, this embodiment of the invention has the advantage of providing a container that, although it can be opened and closed several times, is quite solid and strong.

Of course, all the characteristics of the security ring that have been previously stated are also considered applicable to the container according to this form of embodiment of the invention.

Finally, the invention provides a method for closing a container, said container comprising an opening, an annular rim that surrounds and radially protrudes from said opening, and a lid that closes said opening and has a perimeter edge that rests on the annular rim, Said procedure comprising the stages consisting of:

- prepare a safety ring comprising:

a curved band extending about a predetermined central axis and having first and second end portions superimposed on each other, and

a clamping device operable to cause said end parts to slide in a circumferential direction, keeping them superimposed on each other, between an opening configuration, in which the overlap of said end parts is minimal and the diameter of the curved band with with respect to the central axis is maximum, and a closure configuration, in which the overlapping of said end portions is maximum and the diameter of the curved band is minimum,

said curved band presenting a lateral strip, substantially cylindrical in shape, a first circumferential edge protruding radially inward with respect to the lateral strip and a second circumferential edge, the first circumferential edge of the curved band being folded into a curl and presenting a cross section, provided with respect to a section plane containing the central axis (X) of the curved band, of a substantially circular or arcuate shape,

- applying said safety ring to the container so that the lateral strip of the curved band surrounds the annular rim of the container and the first circumferential edge overlaps the perimeter edge of the lid, and

- folding the second circumferential edge of the curved band under the annular rim of the container. This embodiment substantially achieves the same advantages described above, in particular that of allowing a fairly stable and secure closure of the container, while allowing its opening and closing on repeated occasions.

Obviously, also in this case, all the characteristics of the safety ring that have been described above are also considered applicable to the method according to this embodiment of the invention.

According to a preferred aspect of the method, the step of folding the second circumferential edge of the curved band can be carried out while the end portions of the curved band are in the closing configuration.

Thanks to this solution, the step of folding the second circumferential edge becomes simpler and safer.

According to another aspect of the method, the step of folding the second circumferential edge of the curved band can be obtained by rolling or crimping.

Rolling is a process that can use one or more rollers, in each of which a revolution movement is exerted around the central axis of the curved strip and, in this context, a radial movement from the outside to the inside, from so that they come into contact and roll against the second circumferential edge and push the axis of rotation, obtaining its folding below the annular rim of the container.

Crimping is a process that can use a plurality of jaws that are distributed circumferentially around the circlip and that move radially toward the central axis (without movement of revolution), to simultaneously contact the second circumferential edge and push it from the exterior towards the interior, obtaining its folding below the annular rim of the container.

These processes have the advantage of allowing the effective folding of the second circumferential edge of the security ring, guaranteeing a very stable and precise locking of the lid on the container.

Brief description of the drawings

Other features and advantages of the invention will become clearer after reading the following description provided as a non-limiting example, with the help of the attached drawings.

Figure 1 is a top view of a container closed by a security ring according to an embodiment of the present invention.

Figure 2 is the section ll-ll of figure 1.

Figure 3 is an enlarged detail of Figure 2.

Figure 4 is the detail of Figure 3 shown after the step of folding the second circumferential edge of the safety ring.

Figure 5 is a front view of the circlip of Figure 1 shown on an enlarged scale.

Figure 6 is a top view of the circlip of Figure 5.

Figure 7 is the view indicated by VII in Figure 6.

Figure 8 is the VIN-VIN section of Figure 7, shown on an enlarged scale.

Figure 9 is the section IX-IX of Figure 6.

Figure 10 is the X-X section of Figure 6.

Figure 11 is the detail of Figure 10 shown after attaching the safety ring to the container and folding its second circumferential edge under the annular rim of the container itself.

Detailed description

From the attached figures, a security ring 100 can be seen for closing a container 105, for example, but not necessarily a bucket, bucket or drum.

The container 105 can be used to contain products in liquid form, or at least fluid, for example, dangerous, harmful and/or polluting products, such as acids, paints, thinners and the like. The container 105, which can be made of metal, generally comprises an opening 110 through which it can be filled and emptied.

For example, the container 105 can have a side wall 115 that is substantially cylindrical or frustoconical in shape, which is closed at the bottom by a bottom wall (not shown) and has an upper circumferential edge that defines the opening 110.

The opening 110, which can have a circular circumference, is coaxially surrounded by an annular rim 120, which projects radially from the side wall 115 towards the outside of the opening 110.

The annular rim 120 can be obtained by turning back the upper circumferential edge of the side wall 115.

A cover 125 can be applied to the container 105, also made of metallic material, which is adapted to close the opening 110 and is provided with a perimeter edge 130 that rests on the annular rim 120.

Although in the attached figures the perimeter edge 130 has been shown perfectly flat, in many other embodiments the perimeter edge 130 can also be rotated backwards to at least partially embrace the annular rim 120, sometimes even wrapping around it. at its outermost diameter.

Locking ring 100 is used to securely lock lid 125 to container 105.

The circlip 100 comprises a curved band 140, preferably made of metal, which is curved so as to extend in a ring arrangement about a predetermined central axis X.

As illustrated in figure 3, in a direction parallel to the central axis X, the curved band 140 comprises a first circumferential edge 145, a second circumferential edge 150 and a lateral strip 155, substantially cylindrical in shape, which is interposed between the first circumferential edge edge 145 and the second circumferential edge 150.

The second circumferential edge 150 may initially be shaped as a simple extension of the side strip 155, ie as a further cylindrical strip or possibly a truncated cone-shaped strip extending from the side strip away from the first circumferential edge 145.

The first circumferential edge 145 is shaped so that it projects radially from the side strip 155 towards the central axis X.

For example, the first circumferential edge 145 may be folded in a curl toward the inside of the side strip 155 and, preferably, toward the second circumferential edge 150.

In this way, the cross section of the first circumferential edge 145, made with respect to a section plane containing the central axis X of the curved band 140, has a substantially circular or spiral shape, for example an arc of a circle or a spiral arc, similar to that of an open ring.

More generally, said crimping of the first circumferential edge 145 gives the overall cross section of the curved band 140 a substantially P-shaped shape.

As illustrated in figure 9, the curved band 140 can also present one or more notches 135, which can be provided in the form of projections that extend from the inner surface of the second circumferential edge 150 towards the central axis X.

These notches 135, which can be obtained by local deformation of the curved band 140, can be distributed around the central axis X in such a way that they are angularly equidistant.

For example, the circlip 100 can comprise three notches 135 separated from each other by an angle of 120° (as can be seen in Figure 1).

Thanks to this solution, the cover 125 can be coupled in a preliminary way to the security ring 100, with its own perimeter edge 130 that remains axially locked between the first circumferential edge 145 of the curved band 140 and the notches 135.

To obtain this effect, the axial distance that separates each notch 135 from the first circumferential edge 145 is generally greater than the thickness of the perimeter edge 130 of the cover 125, and the minimum radial distance that separates each notch 135 from the central axis X is less than the maximum radius of said perimeter edge 130.

In this way, the lid 125 and the security ring 100 can be applied to the container 105 with a single maneuver.

However, it is not excluded that in other embodiments the notches 135 are not present and/or that the safety ring 100 is installed on the container 105 after the latter has been closed with the lid 125. In any case, the safety ring 100 is coaxially inserted into the opening 110 of the container 105, so that the first circumferential edge 145 overlaps the annular rim 120, also resting on the perimeter edge 130 of the lid 125, as shown in the figure. figure 3.

In this position, the lateral strip 155 of the safety ring 100 coaxially surrounds the annular rim 120, while the second circumferential edge 150 descends and exceeds the bottom generatrices of the same annular rim 120.

The second circumferential edge 150 is then deformed and folded radially inward, i.e., towards the central axis X, to bring it under and against the annular rim 120, so that the circlip 100 is tight on the container. 105 and firmly lock the latter to the cover 125, as shown in figure 4.

This folding preferably affects the entire perimeter extension of the second circumferential edge 150 and can be obtained by rolling or crimping.

The rolling can also provide for the use of one or more rollers, exerting on each of them a movement of revolution around the central axis X and, in this context, a movement in a radial direction from the outside to the inside, so that each of them first comes into contact and begins to roll against the second circumferential edge 150 and then pushes it towards the central axis X, folding it under the annular rim 120.

The crimping can contemplate the use of a plurality of jaws that are distributed circumferentially around the circlip 100 and that, then, move radially towards the central axis X (without movement of revolution), to simultaneously enter into contact with the second circumferential edge 150 and then pushing it from the outside to the inside folding it under the annular rim 120. Returning to the circlip 100, the curved band 140 provides, in the circumferential direction, two opposite end parts, one first end part 160 and a second end part 165, which can be seen in figures 7 and 8.

The first and second end portions 160 and 165 overlap one another, collaterally and preferably in contact with one another, so that the curved band 140 also defines a closed ring about the central axis X.

The first and second end parts 160 and 165 are not fixed to each other, but can slide relative to each other in the circumferential direction, increasing or reducing the area of mutual overlap and thus varying the diameter of the ring. security 100.

In order to guide this sliding, the first circumferential edge 145 of the curved band 140 can have a first part 170 that extends along the first end part 160 and a second part 175 that extends along the second part of the end. end 165 and, preferably, for the entire remaining circumferential extent of curved band 140.

As illustrated in figure 10, the first part 170 can have a cross section (that is, with respect to a section plane containing the central axis X) having a smaller diameter with respect to the diameter of the cross section of the second part 175 and which can be slidably inserted into the latter. Thanks to this coupling, the first and second end parts 160 and 165 of the curved band 140, which can slide against each other in the circumferential direction, are firmly constrained with each other providing high strength and rigidity to the circlip. 100.

Also the lateral strip 155 of the curved band 140 can comprise a first part 180 that extends in the first end part 160 and a second part 185 that extends in the second end part 165, where the first part 180 can overlap collaterally on the inner side of the second part 185. In other words, the extrados surface of the first part 180 can be turned toward and preferably in contact with the intrados surface of the second part 185.

Preferably, the first end portion 160 of the curved band 140 is, however, devoid of the second circumferential edge 150, that is, of the appendage of the lateral strip 155 which is adapted to fold under and into contact with the annular rim. 120 from container 105.

In other words, the second circumferential edge 150 may extend along the second end portion 165, and preferably for the entire remaining extent of the curved band 140, except for the first end portion 160, the second circumferential edge 150 is missing or interrupted. From another point of view, the first end part 160 can present a notch 190, that is to say, a shape that reduces the height with respect to the other areas of the curved band 140 and, in particular, with respect to that of the second. end portion 165 (as can be seen in Figure 10).

In this way, the first end part 160 of the curved band 140 has substantially no appendage extending below the annular rim 120 of the container 105.

Thanks to this solution, in the mutually overlapping part between the two ends 160 and 165, the second circumferential edge 150 of the safety ring 100 is only defined by the second end part 165, simplifying its folding under the annular rim 120 of the container. 105 (as can be seen in Figure 11).

Lastly, as illustrated in Figures 5 and 6, the circlip 100 comprises a clamping device 195, which can be actuated, preferably manually, to make the end portions 160 and 165 of the curved band 140 slide circumferentially, keeping them superimposed on each other, in order to increase or reduce the total diameter of the curved band 140 with respect to the central axis X.

In particular, clamping device 195 may be adapted to cause end portions 160 and 165 to slide between an opening configuration (not shown) in which overlapping of end portions 160 and 165 is minimal. and the diameter of the curved band 140 is maximum, and a closure configuration (shown in the figures), in which the overlap of said end portions 160 and 165 is maximum and the diameter of the curved band 140 is minimum .

It is noted here that the terms "maximum" and "minimum" are simply meant to indicate that the "maximum" value is greater than the "minimum" value and vice versa.

Preferably, the clamping device 195 is associated with the curved band 140, for example, on the outer surface of the side strip 155, and its dimensions in the axial direction (or in a direction parallel to the central axis X) are preferably such, that do not protrude below said lateral strip 155, that is to say below the annular rim 120 of the container 105, so as not to interfere with the instruments that perform the folding of the second circumferential edge 150 (as can also be seen in figure 11) .

Going into more detail, the clamping device 195 may comprise a first fixing element 200 and a second fixing element 205.

The first fixing element 200 can be fixed to the side strip 155 of the curved band 140, preferably in an area adjacent to but external to the first end part 160.

The second fixing element 205 can be fixed to the side strip 155 of the curved bar 140, preferably at the second end part 165.

The clamping device 195 can further comprise an activation lever 210 and a rod 215.

The activation lever 210 can have an end 220 hinged to one of said fixing elements, in the example to the first fixing element 200, while the connecting rod 215 can have a first end 225 hinged to the other fixing element, in the example to the second fixing element 205, and a second end 230 articulated at an intermediate point of the activation lever 210.

The axes of rotation of the activation lever 210 and the connecting rod 215 may all be parallel to each other and parallel to the center axis X.

Thus, by moving the activation lever 210 in one direction (counterclockwise in Figure 6), the clamping device 195 can cause the end portions 160 and 165 of the curved band 140 to slide into the opening configuration and vice versa, by moving the lever in the opposite direction, the clamping device 195 can cause the end portions 160 and 165 of the curved band 140 to slide toward the closing configuration.

Preferably, the clamping device 195 is configured such that, once the closing configuration has been reached, the end portion 160 and 165 are locked and cannot slide relative to each other in the circumferential direction, unless the clamping device 195 is activated again, for example, by turning the activation lever 210.

The clamping device 195 is mounted on the curved band 140 during the manufacture of the circlip 100, before the latter is installed on the container 105.

During the steps of installing the safety ring 100 and folding of the second circumferential edge 150, the tightening device 195 is preferably kept in the closing configuration, in order to guarantee the locking of the lid 125 on the container 105 in accordance with the procedures described above.

In this way, the first installation of the circlip 100 can be carried out quickly and can be easily automated, since it does not require intervention in the clamping device 195, but only requires that the circlip 100 be inserted into the container 105 and that the second end edge 150 of the curved band 140 folds under the annular rim 120.

After the first installation, when the container 105 is to be opened, the clamping device 195 can be activated towards the opening configuration, to widen the security ring 100.

In this way, the second circumferential edge 150 of the curved band 140, although folded radially inward, can be inserted from the annular rim 120 of the container 105, allowing the removal of the circlip 100 and thus the lid. 125.

If the container 105 is to be closed again, it is possible to reposition the lid 125 and the circlip 100 and then activate the clamping device 195 towards the closing configuration.

In this way, the annular rim 120 of the container 105 and the perimeter edge 130 of the lid 125 can be re-clamped between the first and second circumferential edges 145 and 150 of the circlip 100, firmly locking the lid 125.

In conclusion, it should be noted that the clamping device 195 described above only represents one example and that, in other embodiments, the clamping device 195 could be made in many other different ways, as long as it is adapted so that, in its operation, allow the widening and narrowing of the safety ring 100.

Obviously, a person skilled in the art can make numerous modifications of a technical/installation nature to the safety ring 100 described above and the related method of use, without departing from the scope of the invention, as claimed below.

Claims (7)

A circlip (100) for closing a container (105), wherein said container (105) comprises an opening (110), an annular rim (120) surrounding and radially protruding from said opening (110) and a cover (125) capable of closing said opening (110) and presenting a perimeter edge (130) capable of resting on the annular rim (120), in which the safety ring (100) comprises: - a curved band (140) that extends around a predetermined central axis (X) and that has a first and a second end part (160, 165) superimposed one on the other, - a clamping device (195) operable to make said end parts (160, 165) slide in a circumferential direction, keeping them superimposed on each other, between an opening configuration, in which the superposition of said end parts ( 160, 165) is minimum and the diameter of the curved band (140) with respect to the central axis (X) is maximum, and a closure configuration, in which the overlapping of said end portions (160, 165) is maximum and the diameter of the curved band (140) is minimal, and in which said curved band (140) presents a lateral strip (155), substantially cylindrical in shape, capable of surrounding the annular rim (120) of the container (105), a first circumferential edge (145) that protrudes radially inwards with respect to the lateral strip (155), said circumferential edge being adapted to overlap the perimeter edge (130) of the lid (125), and a second circumferential edge (150) that can be folded under the annular rim (120) of the container (105), wherein the first circumferential edge (145) of the curved band (140) is folded into a curl and has a cross section, proportioned with respect to a section plane containing the central axis (X) of the curved band (140). ), of a substantially circular or arcuate conformation. 2. Circlip (100) according to claim 1, in which the first circumferential edge (145) can have a first part (170) extending into the first end part (160) of the curved band (140). and a second part (175) extending into the second end part (165) of the curved band (140), wherein said first part (170) of the first circumferential edge (145) is slidably inserted into the second part (175). A circlip (100) according to any preceding claim, wherein the first end portion (160) of the curved band (140) is devoid of the second circumferential edge (150). 4. Container (105) comprising an opening (110), an annular rim (120) surrounding and protruding radially from said opening (110), a lid (125) capable of closing said opening (110) and presenting an edge perimeter (130) adapted to rest on the annular rim (120), and a security ring (100) according to any of the preceding claims. 5. Method for closing a container (105), wherein said container (105) comprises an opening (110), an annular rim (120) that surrounds and radially protrudes from said opening (110) and a lid (125) that closes said opening (110) and which presents a perimeter edge (130) that rests on the annular rim (120), in which said procedure comprises the following steps: - preparing a security ring (100) comprising: a curved band (140) extending around a predetermined central axis (X) and having first and second end portions (160, 165) superimposed on each other, and a clamping device (195) operable to cause said end parts (160, 165) to slide in a circumferential direction, keeping them superimposed on each other, between an opening configuration, in which the superposition of said end parts (160 , 165) is minimum and the diameter of the curved band (140) with respect to the central axis (X) is maximum, and a closure configuration, in which the overlapping of said end portions (160, 165) is maximum and the diameter of the curved band (140) is minimal, wherein said curved band (140) presents a side strip (155) of substantially cylindrical shape, a first circumferential edge (145) radially inwardly projecting with respect to the side strip (155) and a second circumferential edge (150) ), wherein the first circumferential edge (145) of the curved band (140) is folded into a curl and has a cross section, proportioned with respect to a section plane containing the central axis (X) of the curved band (140). ), of a substantially circular or arcuate conformation, - applying said safety ring (100) to the container so that the lateral strip (155) of the curved band (140) surrounds the annular rim (120) of the container and the first circumferential edge (145) overlaps the perimeter edge (130) of the cover (125), and - folding the second circumferential edge (150) of the curved band (140) under the annular rim (120) of the container (105). The method according to claim 5, wherein the step of folding the second circumferential edge (150) of the curved band (140) is carried out while the end portions (160, 165) of the curved band (140) they are in the shutdown configuration. Method according to claim 5 or 6, in which the step of folding the second circumferential edge (150) of the curved band (140) is obtained by rolling or crimping.