ES2336811T3 - PLATE COVER WITH A BIG DRILL FOR A DRINK BOAT. - Google Patents

Abstract

The sheet metal lid (1) has a lid panel (10) surrounded by a folded edge (11). The panel has a large dimensioned opening (15) enclosed by a circumferential strip (16) which is axially offset opposite a plane (E) of the opening surface. A circumferentially and radially extending reinforcement plateau 20) runs along at least one circumferential section of the strip. The reinforcement plateau can be formed sickle-shaped with a central bulge (23) and two circumferentially extending arms (21,22).

Description

Sheet metal cover with a large hole for a drink boat

The invention relates to a sheet metal cover for close container bodies whose contents are in a closed state under increased internal pressure, such as boats for drinks that contain carbon dioxide.

To be able to easily open the containers of this type, it is usual to provide in the flat part of the lid (the panel or lid panel) of the sheet metal lid a limited area that can break by pressure and to thereby release the opening of exit. Different configurations of the opening zone are known by breakage and different ways of applying the opening pressure, among others by US-A 3,361,261 (Fraze) with a trapecial zone of rapid opening inside a Essentially oval surface, limited on the edge side by folding lines (see 16, 18 in the indicated document). This Rolled fold line stabilizes the panel. The surface oval inside the fold lines is clearly less than 30% of the complete panel.

Also in other tapas, a limited area is closed with sheet that by means of a lever flange (Tab) breaks along a line of weakening and it press inside the closed container. When desired set up the boat and in particular the lid so that you can close again, it is not possible to use the two solutions mentioned.

Numerous solutions according to the state of the technique are devoted to the problem of the possibility of closing again beverage cans, in particular under external pressure (policy) and with internal overpressure in the closed container. The charge for pressure on both sides requires the solution for the sheet metal lid numerous features that cannot be easily provided in a harmonized way and on a small surface. Numerous solutions according to the state of the art, which suggest a repeated closing capacity, they get the same only with the Loss of fitness of a boat for stacking. However, the Stacking fitness is an original feature of the boat closed that should not be lost. It should still be possible to stack Multi-level boats without the need to apply items additional. Particularly in the area of the boat's metal cover it is necessary to minimize modifying interventions in the closure to facilitate the filling company the acceptance of a new type of boat covers. The principle of the possibility of a repeated closure must be basically different, without the part flat on the lid is arranged a "Tab" (most of the SOT times). In this way an additional surface is obtained free, currently occupied by the quick opening flange. This additional space is located directly on the panel plane (slightly above it).

The object of the invention is to prepare a sheet metal lid for closing a beverage can for facilitate the assembly of a repeated closing device, first place separately, and facilitate the assembly of the same in the cover of lock. Also, the sheet metal cover must be configured in such a way to maintain its resistance to pressure, do not lose your ability to the stacking and be respect to its design at least in the area of the outer edge as close as possible to a standard part for keep changes as small as possible in a filling line However, the lid must provide the ability for repeated closure of the container, since the canister body of One piece, molded by drawing (using DWI) cannot contribute something to this solution (aptitude for repeated closure) Due to its original characteristics.

This objective is achieved with the claim 1. The lid is manufactured by a method (claim fifteen).

The invention starts from a solution in which a additional piece (a repeated closing device) is introduced in a "large opening" in the flat part of the lid. This piece additional should not be the purpose of this report descriptive and of this claim, but only the cover of sheet that as such presents the aptitude and characteristics and meet the requirements to be combined with a device repeated closure of this type and to be placed as a cover closure at the filler company in a canister body filled and closed by folding.

As a large sized opening in the panel (the flat part of the lid) should be understood that this provides a clearly larger opening than in the case of breakable areas initially described. These areas they have a relatively small surface extension to be able to Maintain total panel stability.

However, LOE closure caps are known that they provide for drinks (most of the time beer) a larger opening that is transversely oriented and configured in the form of a kidney, but not with a circular shape, due to that there is still a need to fix a lever flange (Tab) from the outside on the cover plate (using a rivet), and also this kidney-shaped opening is only on one side of the central axial plane of the cover, see figure 9 in the WO 97/30902 (ANCC).

With the invention a surface of the essentially larger opening. Perforation is performed in the lid whose opening dimensions exceed the center of the top. Large sized hole is not closed by means of a piece of sheet metal and it cannot be opened along a line of weakening notched; it stays open to be closed later by the closing device repeated that presents an adapted geometry. The lid allows the opening and closing the flow path in the open area (the perforation), so we continue talking about an "opening Largely sized "that releases the flow of the beverage controlled by the repeated closing device that should not explain here, see the document in detail PCT / NL2004 / 00024 of January 13, 2004 (WO-A 2005/068312.

The metal cover is still a metal cover completely molded and from a manufacturing process. It is more than a rough form, as it is prepared to be combined with the repeated closing part to replace in this combination a SOT closure cap with weakening line fitted, normally used today, and to close so that the boat bodies can be closed repeatedly available in a standardized way, so they are not explained here.

Around the opening sized large is provided a surrounding band shifted by one level. This band is used for stabilization. Throughout at least a perimeter section of this surrounding band is planned a flat part of reinforcement, located more towards the outside, that favors additionally the reinforcement of the sheet metal cover. Due to the relatively large sized opening is accurate take into account a large loss of resistance of the panel that compensates by surrounding band and reinforcement surface (flat part of reinforcement) that extends partially through the perimeter of the surrounding band. This is achieved through a stepped (sequence) of geometric shapes that extend clearly in the perimeter direction.

The flat reinforcement part extends only that only by a part of the perimeter and in radial direction, being oriented flat and configured in particular in the form of partial moon or similar to an arc segment. Can be described also in such a way that it presents a wider section with a larger radial dimension and two stretches of arm that extend perimeter. The flat part extends by an angle perimeter of more than 180º.

Because the large opening is arranged eccentrically with respect to the center, on one side of the opening is a greater part of the lid panel available than in the other side on which the opening comes closer to the groove perimeter. The eccentricity can be between 5% and 25% of the diameter of the flat part of the lid (in the unperforated state) and depends on the dimensioning of the configured main opening large and planned most of the time with form circular. Inside the perimeter groove is preferably an area with an extension between 10% and 15% referred to the diameter of the panel (flat part of the lid).

This shift to the side (seen from the center) allows the additional reinforcement to be located on the other side by the flat part of the partial moon-shaped reinforcement or arc segment (abbreviated "crescent-shaped"). The flat part of reinforcement extends at least 90º, preferably about 180 ° of the opening and is configured in such a way that it covers more than 180º in relation to the flat part of the lid. Due to the eccentric arrangement is created a space between the edge of the opening and the perimeter groove to arrange this reinforcement.

On the other side is a sheet metal surface lower than the opening surface formed by the perforation.

To describe a "big opening" is possible from more than 30% of the cover panel surface not yet drilled This dimension is related to the surface that It is proportional to the square of the radius. When the opening size with the diameter, the diameter of the opening (with an essentially circular configuration) is superior to a 50% of the diameter of the flat part of the lid, which is valid also with respect to the dimensioning of the spokes. It preferred an interval between 55% and 65%. The opening is at least in the essential circular or at least approximately oval and has a free inner edge.

Other information about the extension surface, seen in the radial direction of the flat part of the lid, refer to the perimeter band surrounding the opening Largely sized and leave between the edge of the opening and the beginning of the perimeter band another surrounding edge band also the opening. This edge band and the perimeter band previously mentioned are in axial direction (perpendicular to the radial extension) on two different levels, also called height or height level or height position. The axial direction defines the direction in cylindrical coordinates perpendicular to the radial.

Avoid talking with reference to the cover panel of "inside" and "outside", as it should be described and claim in the state not provided in the boat body.

As can be seen from the figures, it must start from that "outside" appears in reality as "above" in the figures, which does not represent a limitation with respect to the description of the axial relationships of height.

Due to the placement of the flat part of reinforcement in a part of the perimeter of the large opening, which is surrounded at least partially by a perimeter band, it facilitates the arrangement of another band that extends on one side of the perimeter and is called "another intermediate band". This band It lies between the outer edge of the flat reinforcement part and the perimeter groove.

The other intermediate band and the perimeter band they have along their perimeter extension preferably a constant width Thanks to the different structures arranged, which extend in the perimeter direction, it is possible to provide different heights for these structures, which refers to the axial direction of the geometry described above mainly in the radial direction.

In cross-sectional view it is possible form ascending and descending parts that with different levels height guarantee that a reinforcement can be obtained that can be extended to the flat part of the complete cover, however the perforation (opening) large dimension. Between two respective zones adjoining therefore a transition zone is formed. This can present as a step a part that runs at least by inclined sections and ends with the respective radios in the following structure.

As a reference for height positions a base level located at the level of the perforation can be defined,  that is, in the plane of the opening. The other positions of Height can be defined with reference to this base level.

In such a configuration it is achieved, notwithstanding the destabilizing effect of the "large opening", high pressure stability and additionally surprising a "bulging" controlled, which corresponds to a bulging of the lid under the effect of an internal pressure excessively high Until normal pressure is reached, and even a multiple of normal pressure, the lid maintains its flat stability  in such a way that through the repeated closing device you can get a secure shutter in the first perimeter band. This band remains reliably in the same height position (a same level along the entire perimeter) and guarantees a shutter function with respect to a shutter skirt of the repeated closing device. It presses in its position of closing and sealing on the perimeter band.

It is possible to reliably compensate for the loss of resistance. By combining all the geometries of reinforcement, in particular the outstanding features according to the claim 1, a "bulge" is also achieved controlled in the sense of increased space in the part higher due to increased internal pressure in the boat closed. The cover meets all the requirements initially mentioned regarding pressure resistance, the approximation largely to standardized closures, stacking capacity and the possibility of getting a repeated closure.

The other edge band can meet another height level than the first perimeter band, preferably at A lower level. The opening for the mentioned device can comprise two flattened parts to perfect assembly. These parts extend radially inwards.

The height of the flat part can be located preferably above the base level. When the flat part is limited radially inside and radially outside by the two perimeter bands (intermediate band and surrounding band) a perfected reinforcement is achieved with at least two levels of height different from these three zones. The surrounding band and the another intermediate band may preferably be at a same height.

A mouth of the so-called other band intermediate, which does not extend throughout the perimeter but, equally that the flat part of reinforcement, only for a part of it has place at the ends of the arms of the flat reinforcement part. Here a mouth surface formed in shape is formed of V or Y.

Beam-shaped reinforcement surfaces or partial moon have no additional grooves in their flat extension

It should be mentioned that the blank modified, ie the finished product and prepared to house the repeated closing device, presents an opening, called also perforation, which is not coated with sheet. Does not present notched or weakening lines. It is also not mounted on the sheet a quick opening flange (Tab).

To compensate for the loss of rigidity of the panel geometric shapes that extend in the direction are used perimeter. In the radial direction, a ascending and descending form, that is, a change of height positions (level change) in particular in the parts from the lid from which the large opening has moved (displaced from the center) and where the flat surface in Sickle shape is done without other reinforcements or grooves additional.

The step change of height positions is carried out from radially inside to radially out, starting from the inner edge band (around the opening large) to the first surrounding band, to the flat part of reinforcement, to the other intermediate band and, finally, through the Perimeter groove to folded edge or mounting edge. Between the reinforcement zones, which extend by at least 90º, are arranged steps that run preferably inclined

The invention is described and complemented by Below with reference to embodiments.

Figure 1 is a top plan view of a cover as one of several first examples.

Figure 2 is an axial sectional view. A-A of the cover according to figure 1.

Figure 3 is another example with two views in axial cutting A-A and B-B of the lid displaced in 90º.

The cover 1 shown in figures 1 and 2 as first example is intended for a drinking can body usual not represented. The cover is made of sheet metal with a wall thickness thin, as usual in general.

The lid has a lid surface 10 (in panel shape) and a folded edge 11 for connection with the corresponding container. Along the folded edge runs a cushioning groove 12 (perimeter groove) that limits the cover surface 10 radially outward. A molded body by drawing it is generally known, so it is not It is necessary to describe it. It has an upper body edge, radially outwardly shaped flange with an edge folding 11 which by means of a folding device (roller of folding) closes in the form of a multiple fold, most of the times in the filler company.

The folding edge 11 is radially outside the shutter groove 12, also called "groove perimeter ", and protrudes in axial height from the cover surface 10. The cover surface 10, also called "panel", is configured in a total of circular form but only partially exists due to the opening 15 that clearly stands out for its size and constitutes a cut hole and essentially circular in the cover surface.

Coordinates are used for the description radial cylindrical (horizontal direction) extension of the cover surface and the axial direction in the vertical direction or height direction, perpendicular to plane E in Figure 2.

The body itself is not shown and neither show separately the repeated closing device 90 that should insert into hole 15 and mount on the edge of it.

The opening 15 in Figure 1 is shown Largely sized in plan view from above. He center of the opening M15 is arranged eccentrically and shifted in ΔM with respect to center M10 of panel 10. In several examples of embodiment a shift has been selected between 5% and 25%, in the embodiment shown, it ranges from 10% to 12% up to 15% in relationship with the diameter d10 of the panel 10 which extends in the inside of the perimeter groove 12, d10 is 2-r10, as shown in the figure.

The diameter as an example of a dimension of the d15 opening with 2-r15 drilling, represented in the essential example in a circular way, is less than the diameter d10 of panel 10, but greater than 50% of this dimension of the opening, which clearly underlines the size of the opening 15.

A first and a second perimeter band surround opening 15. The first perimeter band adjoins immediately with the edge of the opening and has inside two opposite flattened parts 15b, 15a in the form of a segment. These they serve to perfect the assembly of the closing device repeated 90. The second perimeter band 16 has a radial dimension r16 which is superior to that of the first perimeter band. This set in the height direction above the plane E.

The plane E is located in the direction horizontal in the opening 15 and forms the reference level for height comparisons. This is the plane of the opening 15, a superficial extension in this plane forms the surface of the opening and describes the size of the opening 15.

The perimeter band 16 passes to the band interior perimeter 16a through a smooth step 16 ', in inclined The highest perimeter band 16 constitutes a pressure and support surface for a sealing skirt and closure of the repeated closing device 90 and is completely at the same level.

Surrounding band 16 runs completely around opening 15 and borders on the left side in the Figure 1 with the perimeter groove. On the right side in the figure 1, this band constitutes the limit of a flat part 20 configured as a sickle or partial moon that extends only by a part of the perimeter around the opening 15 and has been stamped in this place. This flat part is molded so both in the area of the cover surface whose center has been offset opening 15. It is located to the right of the first central axial plane that runs perpendicular to the line A-A through M10.

It extends over a part of the perimeter of the opening 15, in an essentially circular configuration by 180º.

In relation to the perimeter direction of the cover surface and perimeter groove 12, the extension perimeter of the flat part 20 in the form of a sickle is greater than 180º, It is in particular in the range between 200º and 240º, specifically in the range of 210º ± 3%.

This follows from two arms 21, 22 that are they extend in the perimeter direction and form the ends of the part reinforcement flat. The flat reinforcement part has between these two ends 21, 22 a wide part 23 having its maximum extension in the central background A-A and slimming in shape arc towards the ends 21, 22.

Between the flat part 20 and the perimeter groove 12 is provided another intermediate band 17 that presents in its essentially perimeter extension a constant width. The perimeter extension corresponds to the arc length of the part flat 20 and is in any case greater than 90º.

The two perimeter bands 16 and 17 have as essential the same width as indicated in figure 1 with r6 and r7. They also have essentially the same height position with with respect to plane E, which is clear from the figure 2.

Both the perimeter band 16 and also the perimeter band 17 pass through a step 16 '' and 17 ' preferably inclined to the flat surface area 20 which It is at a lower level, preferably a little above level E in figure 2.

An edge 20 'of the flat shaped surface 20 arc corresponds to these steps 16 '' and 17 'and is configured preferably as a respective inclined step with at minus a short inclined section with two radii of transition to the respective adjacent area. These inclined parts 20 'constitute reinforcement. Also the change between higher and lower levels (with respect to a height direction) constitutes a reinforcement, seen in a radial direction along a radius that starts from the center M15.

The outer perimeter band 17 leads to the inner surrounding band 16 in the two mouth areas 17b, 17a immediately adjoining ends 21, 22 of the arms of the flat part 20. Here are Y-shaped areas or V which are wider than the respective band shape of the bands perimeter 16, 17.

To explain the dimension of the opening 15 must be referred to radios. The inner radius r15 of the opening it is represented in comparison to the surface radius r10 Cover. Both radios start from their respective center M15 and M10. He radius r15 is greater than half of radius r10, in particular greater than 60% in a range between 60% and 65% of the radius Main panel cover. This fact characterizes an opening big. The expert understands "large" optically in comparison with a size of opening areas due to breakage in covers of beverage cans normally expected on the priority date of The present invention. If an expert in the field of beverage cans compare the length of these radios, i would say immediately with with respect to r15 that this is selected in a large way.

With regard to surfaces it is possible to carry also converting by means of radios (quadratic law), the surface of the opening 15 being in relation to the size original (without perforation 15) greater than 30% of the surface of panel 30. Also here a large area of the opening a range around 40%, preferably between 35% and 45% of the unperforated panel surface.

The indicated dimensions are also maintained with respect to the displacement of the center ΔM, as it appears of the position of the M10 and M15 centers. In this case it is useful a reference to diameter d10 (double the main radius) for The size indication.

The displacement of the center \ DeltaM is situated in different examples of realization between 5% and 25% that are not show in full. The embodiments vary in the extent to which also the size of the opening 15 has about margins and an area, as well as the shape of the opening that it can differ from the exact circular shape and it can be for example polygonal or oval. That is, the form is at least approximately circular or oval.

The center \ DeltaM offset is preferably located between 10% and 15%.

All these dimensions underline what it is, expressed in technical terms, of a large opening 15 in comparison with openings provided in beverage bottle covers normal and "expected" by the specialist.

To compensate for the loss of rigidity of the panel The geometric shapes described above are used. In radial direction appears an ascending and descending form, it is that is, a change in height positions (level change) in particular in the parts of the lid from which it has moved the opening 15 (offset from the center) and in which the flat surface 20 in the form of a sickle is made without other reinforcements or additional grooves.

The change in height positions takes out (staggered) from radially inside towards radially out, starting with the inner edge band (around opening 15) to the first surrounding band 16, to the flat reinforcement part 20, to the other intermediate band 17 and, finally, through the perimeter groove 12 to the edge perimeter 11. Between the zones are arranged steps that preferably run in a staggered manner, as has been described above with reference to step 20 'of the part reinforcement plane 20 (an essentially flat surface of great extension).

The change in the height level of the geometries of reinforcement 16a, 16, 20, 17, 12, 11 can be seen in the view in cut in figure 2. Each of the reinforcement geometries is extends perimeter by at least 90º, as symbolized using the auxiliary lines C-C in figure 1. These lines define an angle of 90º and all reinforcements exceed the same widely in the perimeter direction, reach 180º and some perimeter reinforcements even reach 360º.

The opening 15 is not covered with sheet metal but which is open and has a free inner edge 15a. This displaced between 5% and 25% compared to the center (in relation to the diameter of the panel) and the surrounding band 16 surrounding this opening reliably maintains the same height position for facilitate a shutter function.

The other embodiment according to figure 3 It is similar to the first embodiment and has two cuts A-A and B-B.

Here it is shown that in the transverse direction B-B (the central plane) also takes place a change from height levels from radially inside to radially out to the extent that sickle 20 extends. related to the central plane A-A, the opening 15 it is symmetric in the transverse direction, so the edge left and right edge have the same distance from the groove perimeter 12. Unlike the above, there is a asymmetry with respect to the central plane B-B. He hole 15 with the free inner edge 15a is displaced towards the first side (to this side) of the central plane, so in the on the other side there is a large space for perimeter reinforcement geometries.

The remaining descriptions in relation to the Figure 3 can be taken from the previous embodiment example.

The height difference h1 between the band outer perimeter 17 and inner perimeter band 16 is measured with respect to the flat sickle-shaped surface 20, located more low, according to section A-A.

Claims (16)

1. Sheet metal cover that facilitates repeated closure to close a drinking can body and to accommodate or to mount a repeated closing device (90), (a) in which the metal cover has a panel or a radially inner cover surface (10) of a groove perimeter (12) and a radially outer mounting edge (11) of the perimeter groove (12); (b) in which the panel has a circular or oval opening (15, ΔM), eccentric with respect to the panel, whose opening dimension (d15, r15) is greater than 50% of a diameter (d10, r10) of the panel and this opening is at least about circular, in particular non-rectangular or trapecial, and in which around the opening (15, ΔM) at least partially a surrounding band (16) is provided for stabilization, characterized in that (c) around the opening (15) is stamped a surrounding band (16) that has a perimeter around constant height position. 2. Sheet metal cover according to the claim 1, wherein the opening (15) defines a base plane (E) of the cover panel (10) with respect to which the folded edge or the mounting edge (11), respectively, is located axially higher and with respect to which the perimeter groove (12) is located axially lower. 3. Sheet metal cover according to the claim 1, wherein the first perimeter band (16) as surrounding band is located axially higher than the plane base (E) of the opening surface, extending the band surrounding (16) by a perimeter angle of preferably 360º. 4. Sheet metal cover according to the claim 1, wherein the flat reinforcing part (20) is configured in the form of a sickle with a wide central part (23) and two arms (21, 22) that extend perimeter. 5. Sheet metal cover according to the claim 1, wherein the size of the opening occupies more than one 30% of the surface of the cover panel (10) inside the perimeter groove (12), in particular is sized with a diameter between 55% and 65% of a cover panel diameter. 6. Sheet metal cover according to the claim 1 or 4, wherein the surrounding band (16) has an inner edge section that has a radial distance of one outer edge of the opening (15) to form another edge band interior (16a), in particular with at least two sections of opposite surfaces on the other edge band (16a) that are flattened inward (15a, 15b). 7. Sheet metal cover according to the claim 6, wherein the other edge band (16a) is located at another height level or at a different level than the first perimeter band (16). 8. Sheet metal cover according to the claim 1, wherein the flat reinforcing part (20) is extends by a perimeter angle greater than 180º, in particular by a perimeter angle greater than 200º in relation to the panel perimeter (10). 9. Sheet metal cover according to the claim 1, wherein the flat reinforcing part (20) has a height position located axially lower than that of the surrounding band (16). 10. Sheet metal cover according to the claim 1, wherein the axial height levels of zones (16a, 16, 20, 17, 12) adjoining, which extend at least partially by the perimeter, they are different in radial direction, particularly from radially inside to radially out starting with the other edge band (16a) around the opening (15), to through the first surrounding band (16), the flat part of reinforcement or a moon-shaped reinforcing surface (20) partial, another intermediate band (17) and the perimeter groove (12), presenting height levels an ascending development and falling. 11. Sheet metal cover according to the claim 1, wherein the opening (15) is an opening previously perforated in the lid, not covered with sheet, for housing or mounting the repeated closing device (90), the surrounding band (16) configured or provided, respectively, for the shutter with the device (90). 12. Sheet metal cover according to the claim 1, wherein the eccentric position (ΔM; M10, M15) of the opening (15) is between 5% and 25%, in particular in the range between 10% and 15% in relation to the diameter (d10) of the cover panel (10). 13. Sheet metal lid according to claim 1, wherein the large opening, understood in technical terms and evaluated in relation to "the size normally expected in a beverage can lid", is in particular larger than 30 % of the total area not yet perforated of the cover panel, in particular a quick-opening flange is not fixed in the cover panel (10) with which an area of breakage can be opened inwards
opening. 14. Sheet metal cover according to the claim 1, wherein a reinforcing surface (20, 21, 22, 23) partial moon-shaped or similar to an arc segment is arranged on one side of the eccentric opening (15) which, due to the eccentric arrangement, is further from the perimeter groove (12) than an opposite side of the opening (15). 15. Procedure for the manufacture of a sheet metal cover, according to which the sheet metal cover has a panel of cover (10) and a folded edge (11) that surrounds the panel and is adapted and appropriate for fixing by folding on an edge of a container body, according to which the lid panel (10): (a) is arranged radially inside a perimeter groove (12) and a free opening (15) is made that is extends laterally beyond its central axial plane (B-B), according to which the opening is essentially circular and around the opening (15) is provided at least partially a surrounding band (16) for stabilization; (b) a flat reinforcement portion (20; 21, 22, 23) that extends perimetrically and radially between the surface is stamped along at least one perimeter section, radially inside the perimeter groove (12). perimeter groove and free opening (12, 15), characterized in that (c) around the opening (15) a surrounding band (16) that perimetrically presents a position of constant height 16. Sheet metal cover according to claim 15, wherein the free opening (15) has a free inner edge (15a), in particular without a bent nerve that protrudes from the inner edge.