CA2325419A1 - Sheet-metal closing lid with slightly inclined surface area and tool for producing the same - Google Patents
Sheet-metal closing lid with slightly inclined surface area and tool for producing the same Download PDFInfo
- Publication number
- CA2325419A1 CA2325419A1 CA002325419A CA2325419A CA2325419A1 CA 2325419 A1 CA2325419 A1 CA 2325419A1 CA 002325419 A CA002325419 A CA 002325419A CA 2325419 A CA2325419 A CA 2325419A CA 2325419 A1 CA2325419 A1 CA 2325419A1
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- Canada
- Prior art keywords
- die
- face
- central panel
- edge
- flat portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
- B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
- B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
- B65D17/4012—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening partially by means of a tearing tab
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
The purpose of the present invention is to ensure the lowering of an opening area as well as the generation of a resistance to an upper compression in closing lids while avoiding buckling-type mechanical deformation of the lowered area during the application of an extended and high-pressure compression from below. To this end, a sheet-metal closing lid for beverage cans comprises from the inside towards the outside a lid surface (10), a peripheral groove (20) and a seamed collar (21). At the level of the lid surface, a flat area (40) is adapted to the shape of a gripping tab (9) and of an opening area (8), and is in a lower position relative to the plane of the lid surface (10). This flat area (40) comprises elongated (42, 43) and short (45, 46) edge areas for defining the same relative to the non-lowered remaining part. One at least of the short edge areas (45) rises slightly (.alpha.) from the plane of the lowered flat area (40) towards the plane of the lid surface (10) located above so as to define a transition area capable of elastic deformation upon the application of an extended compression from the lower side of the lid. This invention also relates to a tool comprising a plurality of individual punches (G, R, H, S) for deforming the lid.
Description
Smoothly depressed central panel in a sheet metal can end The technical field of the invention are can ends for beverage cans made of sheet metal, as known from the prior art document WO-A 95!10373 (Schmalbach-Lubeca).
s The invention relates to a portion of a can end which, in the said prior art document, is not treated in detail, but only mentioned casually, namely a lowered flat portion in a central panel on which a gripping tab for opening said can end and an opening portion, turned to the inside when opening the can and separated before along score lines, are arranged. Said two elements are the opening means of a beverage can end and, according to the invention, they are arranged in said lowered flat portion which, in technical terms, is often also designated as "depressed panel". Said lowered flat portion has a substantially rectangular shape with a considerable tendency to an oblong shape, which is larger on one small side, so that two opposite long sides and two short sides are provided, said short sides being located closer to the edge of said can end and a ~s circumferential bead or damping bead delimiting said central panel with respect to the seamed edge (said bead is often also designated as "anti-peaking bead" with an outer "chuck wall" for contacting the wall of the can body).
The problem to be resolved is to allow an opening portion to be depressed and to 2o provide a higher resistance to pressure, so that mechanical bending deformations of the depressed portion are not to be expected, when a surface pressure from below is applied and higher pressures are present. The resistance to pressure shall be improved.
Zs According to the invention, this is achieved by providing at least one of said shorter edge portions of a lowered flat portion not in a stepped shape, but elastically in the form of a transitional portion being smoothly inclined to rise from the level of said flat portion (claim 1 ). By providing an elastic portion which is located closer to a damping bead, a permanent deformation in case of an increasing pressure may be avoided longer than 3o by providing said portion with a stepped shape, said stepped shape, however, remaining for the longer edge portions of said lowered flat portion (claim 6).
Particularly when a barrier zone is provided close to the inner end of said damping bead (claim 5), which barrier zone is obtained by wear-hardening and has the shape of a 3s coined zone with asymmetrical cross-section, said coined zone being arranged entirely circumferentially, a possibility of compensation may be obtained by designing said small transitional portion to said lowered flat portion to be elastically deformable, said elasticity allowing to avoid a permanent deformation of said lowered flat portion, even when pressures of about 6 bar are applied, and to.yield in said portion. Bends along a longitudinal center plane of said can end, in a longitudinal direction through said lowered, particularly oblong flat portion do not occur.
s In contrast to step-shaped edge portions, which normally are to be expected and increase the stiffness and the stability, also at the short edge portions of the lowered flat portion, said elastic transitional portions, the width of which is limited to said portion, are resistant to a higher surface pressure.
A tool for shaping said can end is particularly pointed out (claim 10,11 ), which tool is not designed to have sharp steps in said edge portions, but is reduced in height to particularly have an inclined extension. In the remaining portion, the long edge portions, however, the tool still has a stepped shape, such that it is capable of depressing the surface of said lowered flat portion of said sheet metal can end and, thus, providing two ~s parallel curvatures, each having a radius (curved in opposite directions and being slightly spaced apart in radial direction). Two die portions of the tool, which die portions shape the short edge portion of the depressed surface in the central panel, are preferably reduced in height with respect to a long edge portion in relation to a counter-face of the lower die.
A double curvature comprises to elongated lines spaced apart in parallel, at each of which the can end has a sharply curved extension in a direction perpendicular to the extension of the line, said curvature extending in direction of a radius which is concave at the first curvature and convex at the second curvature. A web portion provided zs between said two curvatures connects the remaining portion of the central panel, said remaining portion being located further above, with said lowered flat portion in which the opening means of the can end are arranged. The connecting web or connecting wall between said two curvatures extends at an angle of substantially between 40° and 60°, particularly about 45°, and forms a reinforcement in said elongated portions. In the short 3o edge portions of said depressed portion, no curvature and no substantial step (bend) exists, but an elastic surface being inclined to rise in a ramp shape, said surface having a width of substantially between 30% and 80% of a distance of the two curvatures on one side to said two curvatures on the other side of said depressed portion, the distance mentioned being located close to the short edge portions (claim 7).
3s A transitional portion between said step-shaped longer edge portions and said elastic ramp-shaped portion (claim 8, claim 9) extends at a radius, at which said inclined web between said two curvatures continuously looses its inclination and changes from an initially steep inclination angle to an angle of substantially 0° in relation to the central panel.
In an end portion of said longer edge portion, said web does not only extend at a changed inclination angle, but can also have an additional curvature to pass into an elastic ramp-shaped portion, particularly one half of a hypothetical imaginary curvature of 90° missing and in the remaining half portion, said steeply inclined connecting web continuously changing to said flat ramp-shaped portion (claim 9).
An alternative is provided by a web wall continuously changing in height, said wall not substantially changing its angle (claim 9, first alternative).
Together with a tool for shaping a can end, a method is described to the expert by which he may one of shape further and shape at all a can end, such that at least one of ~s those edge portions of said lowered portion which are positioned close to said damping bead are provided with an elastic transition instead of a step-shaped reinforced transition as the depressed portion has in the remaining portions corresponding to the longer edge portions.
zo A first upper die, which is arranged radially inside an annular supporting die, is provided with one of a shortened and height-reduced face in the portions which are positioned close to said damping bead, said face, when said die is closed in a bottom end position, leaving a more than parasitic gap between a lower counter-face of a supporting die required for coining or scoring and a short edge portion of an upper die. Said closed Zs position is the lower operating position in which the elongated faces shape the longer edge portions of said depressed portion, such that a step is obtained.
Preferably, the face at the two shorter edge portions of said upper first die is reduced in height, said face being particularly designed as a web which contacts said central panel only at its outer portion.
Radially outside of said annular lower supporting die, which has a positioning and supporting function, an annular centering die is provided, which engages in said damping bead to allow said central panel to be located with said first upper die on both sides of said annular supporting die.
The height-reduced short edge portion of said upper first die and a face of said die, respectively, may be inclined to extend at an angle relative with respect to an assumed extended supporting surface of one of said outer lower annular die and a lower counter-face of said lower first die. The angle is larger than zero, but only small, particularly in a range between 3° and 10° (claim 15). When the upper first die is equipped with a receiving space, in which opening means may be arranged, the web in said short edge portion close to said circumferential bead is provided with an inclined face.
In an s operating position (bottom position) of said upper first die, the outer end of said inclined face extends substantially on the same level as an upward directing face of said supporting die, being a second lower die, and the sheet thickness of said can end would have to be added, and consequently, the level would be higher by the sheet thickness, here, however, according to the invention, a tool without an inserted can end shall be described and claimed.
It is understood, that the central panel as a whole does not have an entire flat surface, but a surface which is slightly vaulted to the outside (in upward direction), which has a corresponding effect on the general design of the can end and the depressed flat ~s portion.
In the following, the invention is described in detail by several embodiments.
Figure 1 illustrates an embodiment of a can end having a circumferential step-shaped edge portion 41 adapted to delimit a flat portion 40 (depressed s panel) lowered from a central panel (10).
Figure 2 is a sectional view along a plane A-A of figure 1 showing shaping tools G,T,S used for shaping and clampingly supporting a can end, whereas dies R,H are advantageous but not necessarily required.
Figure 3 illustrates an embodiment of a can end being provided with elastic transitional portions 45,46 at the smaller sides delimiting said flat portion 40.
Figure 4a is a sectional view along A-A of figure 3.
Figure 4b is a sectional view along B-B of figure 3 showing the shaping tools G,T,S
and R,H, respectively, used for shaping and clampingly supporting a can ~s end.
Figure 5 is a cross-sectional view of an elastic edge portion 45 between a coined web 30 obtained by wear-hardening and a lowered flat portion 40 (depressed panel).
2o Figure 1 is an illustration of a sheet metal can end, having a flat portion 40 depressed over a circumferential step 41, said flat portion having an oblong shape. At its short edge portions 41 a, which have a strongly curved extension, said depressed flat portion is positioned very close to a circumferential groove 20 which is visible more clearly in a cross-sectional view according to figure 2, according to which said can end comprises 2s an edge 21 intended to be seamed to a can body, an anti peaking bead 20 (also called chuck groove or circumferential bead) and a central panel 10, which, in the cross-section of figure 2, is represented only by a short stripe portion 10a between the dies S
and R and then passes through a sharp step 41 a into said lowered flat portion 40 in which the opening means are arranged. Said opening means comprise a gripping tab 9 3o for opening the can by turning said tab and an opening portion 8 de>iined by score lines and stiffening lines in said lowered portion 40 and extending up to the other short end of said oblong flat portion 40 which approaches said circumferential bead 20 closely on the other side. Two longer edge portions are provided, having a slightly diverging extension and a considerably larger distance with respect to said circumferential bead 20. The 3s outer shape of said gripping tab 9 and said opening portion 8, partly overlapped by said tab, are adapted to said depressed flat portion.
The same can end as in figure 1 is shown in figure 3, having a modified design of said short edge portions. In figure 3, said step-shaped edge 41, shown in figure 1 as being continuous and comprising a double curvature 41',41 ", is interrupted in favor of a continuous ramp-shaped portion 45 and 46 respectively, on both ends of said s depressed flat portion 40 which is visible more clearly in figure 4a, illustrating a section A-A. A section B-B according to figure 4b illustrates the stepped shape, further maintained at two curvatures 43'43" closely adjacent and extending in parallel with respect to each other, and each having a radius which is sharply curved and faces in opposite directions at the edges of the corresponding shaping dies G and S in the long edge portion 43 and the opposite long edge portion 42, respectively.
The depressed flat portion 40, which, on two long edges 43,42 according to figure 3, has two elongated curvatures 43',43" illustrated in figure 4b, is provided with a ramp-shaped inclined portion 45 elastically connecting said depressed portion with the ~s remaining central panel 10, which is visible between the tools R and S in figure 4a.
Here, the short edge portion approaches the circumferential bead 20 very closely, such that any curvatures and steps are avoided to allow said ramp portion to vault elastically, when a pressure is applied. It was found that, when said portion is capable of elastic deformation, it is in a position to resist to higher pressures than when curvatures are zo provided, which curvatures are maintained in the remaining elongated edge portions 42,43 of said depressed flat portion 40, but are avoided on one of both sides as well as on both sides of said depressed flat portion 40 positioned close to said circumferential bead.
zs A tool comprising shaping dies and supporting dies is illustrated in figure 4a and figure 4b, only those portions of a usual tool being shown which, with respect to prior art, are modified in the sense of the proposed idea. The remaining components of the tool may be of a usual nature and shall not be described herein.
3o An inserted can end is supported on an annular die S, the outer shape of which is adapted to the shape of a vertical wall of said circumferential bead 20, which wall faces to the inside, said annular die, according to the two sectional views of figures 4a and 4b, having substantially larger long edge portions of said depressed flat portion 40, to support said central panel 10 entirely circumferentially. Radially outside of said 3s supporting tool S, a wedge-shaped annular die T extending in downward direction and engaging with its face 71a in said circumferential bead 20, is provided. In a closed position, i. e. in a lower lifting or operating position of said tool, said face 71 a is positioned on a lower level with respect to an upward directing face 61 a (longer side) and 61 b (smaller side) of said annular supporting die S. Radially inside said annular die S, an oblong depressing die is provided to operate as a shaping die G, determining with its geometry the geometry of the depressed flat portion 40. Said die is represented with two of its edge portions, a long edge portion 51 and a short edge portion 50, each s having a face 50a,51 a, for contacting a metal sheet to be shaped of said central panel 10. Below said upper shaping die G, a die H is shown, not being provided with a shaping function in the present embodiment, but having a counter-face 60 to serve as a relative object only for defining a horizontal plane. Said die H may serve as a supporting die for applying score lines in one of the depressed flat portion 40 and, before said flat portion is depressed, the central panel 10.
A further annular die R is shown. It is arranged opposite said lower annular die S and has a supporting function, but does not necessarily have to support said can end by contacting or force application on said supporting die S, when an annular centering ~s die T as well as a shaping die G shaping said depressed portion are positioned on both sides of said supporting die S.
Said shaping die G, which may forcibly act in a direction F along an axis extending substantially in perpendicular direction with respect to one of said central panel 10 and zo said counter-face 60 of said tool H, defines with the geometry of its face the shape of the edge portions of said depressed flat portion 40. The elastic portions 45,46 of figure 3 are visible in figure 4a, they are not shaped in steps but remain extending continuously in a ramp-shape and thus elastically between an illustrated bottom (on the right side of figure 4b) of said depressed flat portion 40 and the edge of said central zs panel. In figure 4b, however, it is clearly visible that two closely adjacent curvatures 43',43" cause sharp bends of the metal sheet with a connection web between said two curvatures, said web defining a long edge portion 42,43 of said depressed surface 40. Said connecting web between the curvatures illustrated in figure 3 extends at an angle of substantially 45°, which angle changes to 3o substantially 0° in a portion extending to said ramp portion 45.
Here, said long edge portions 42,43 are visibly curved, each corresponding to substantially one half of a curved circumferential extension of 90°, the remaining 45° are occupied by the halves 45a,45b, respectively, of said ramp 45.
3s As a connecting web, only portions 43a and 42a, respectively remain as curved end portions, respectively, of each long edge portion 43 and 42. The same applies to the other ramp 46 comprising two halves 46a,46b. Thus, the short stepped edge 41 a according to figure 1 is replaced by the upper portions 43a,45a,45b,42a which are symmetrical with respect to a longitudinal center plane A-A of the can end.
An inner receiving portion 52 of the upper shaping die G may be used for one of s receiving a gripping tab 9 and having a protecting function, to leave the score lines and bead geometry in the central panel 10, which were applied before depressing said portion 40, without contact and to contact the metal sheet only at the edge portion of said depressed portion 40.
A face 50a as web-shaped edge portion 50, which face, being a face of the upper die G, does not provide a depressed portion, extends at a small angle of preferably 5°, which may change in a range of up to 3° and up to 10° with respect to the lower counter-face 60 of the lower die H. Said angle alpha (a) is also visible in figure 5, having a ramp-shaped transition 45 of a portion of a can end shown in a sectional view similar to ~s figure 3.
Figure 5 shows the geometry of said ramp-shaped transitional portion 45, being additionally provided with an adjacent circumferential coined portion 30 which is illustrated asymmetrically in a cross-sectional view. A wear-hardened zone obtained by 2o said coining 30, which, in practice, only displaces material in a radial outward direction, such as it may be displaced by a wedge-shaped annular die, provides a mechanical stiff stripe which is neighbored by said elastic ramp portion 45 towards said depressed portion 40. The illustration of said coined annular portion 30 is exaggerated to make it clearly visible. Said damping bead 20 is substantially deep and small to fulfil its function.
Zs Sheet metal can ends described herein are substantially used for closing beverage cans, inside of which high pressures up to 6 or 7 bar may occur. However, other applications are not excluded.
s The invention relates to a portion of a can end which, in the said prior art document, is not treated in detail, but only mentioned casually, namely a lowered flat portion in a central panel on which a gripping tab for opening said can end and an opening portion, turned to the inside when opening the can and separated before along score lines, are arranged. Said two elements are the opening means of a beverage can end and, according to the invention, they are arranged in said lowered flat portion which, in technical terms, is often also designated as "depressed panel". Said lowered flat portion has a substantially rectangular shape with a considerable tendency to an oblong shape, which is larger on one small side, so that two opposite long sides and two short sides are provided, said short sides being located closer to the edge of said can end and a ~s circumferential bead or damping bead delimiting said central panel with respect to the seamed edge (said bead is often also designated as "anti-peaking bead" with an outer "chuck wall" for contacting the wall of the can body).
The problem to be resolved is to allow an opening portion to be depressed and to 2o provide a higher resistance to pressure, so that mechanical bending deformations of the depressed portion are not to be expected, when a surface pressure from below is applied and higher pressures are present. The resistance to pressure shall be improved.
Zs According to the invention, this is achieved by providing at least one of said shorter edge portions of a lowered flat portion not in a stepped shape, but elastically in the form of a transitional portion being smoothly inclined to rise from the level of said flat portion (claim 1 ). By providing an elastic portion which is located closer to a damping bead, a permanent deformation in case of an increasing pressure may be avoided longer than 3o by providing said portion with a stepped shape, said stepped shape, however, remaining for the longer edge portions of said lowered flat portion (claim 6).
Particularly when a barrier zone is provided close to the inner end of said damping bead (claim 5), which barrier zone is obtained by wear-hardening and has the shape of a 3s coined zone with asymmetrical cross-section, said coined zone being arranged entirely circumferentially, a possibility of compensation may be obtained by designing said small transitional portion to said lowered flat portion to be elastically deformable, said elasticity allowing to avoid a permanent deformation of said lowered flat portion, even when pressures of about 6 bar are applied, and to.yield in said portion. Bends along a longitudinal center plane of said can end, in a longitudinal direction through said lowered, particularly oblong flat portion do not occur.
s In contrast to step-shaped edge portions, which normally are to be expected and increase the stiffness and the stability, also at the short edge portions of the lowered flat portion, said elastic transitional portions, the width of which is limited to said portion, are resistant to a higher surface pressure.
A tool for shaping said can end is particularly pointed out (claim 10,11 ), which tool is not designed to have sharp steps in said edge portions, but is reduced in height to particularly have an inclined extension. In the remaining portion, the long edge portions, however, the tool still has a stepped shape, such that it is capable of depressing the surface of said lowered flat portion of said sheet metal can end and, thus, providing two ~s parallel curvatures, each having a radius (curved in opposite directions and being slightly spaced apart in radial direction). Two die portions of the tool, which die portions shape the short edge portion of the depressed surface in the central panel, are preferably reduced in height with respect to a long edge portion in relation to a counter-face of the lower die.
A double curvature comprises to elongated lines spaced apart in parallel, at each of which the can end has a sharply curved extension in a direction perpendicular to the extension of the line, said curvature extending in direction of a radius which is concave at the first curvature and convex at the second curvature. A web portion provided zs between said two curvatures connects the remaining portion of the central panel, said remaining portion being located further above, with said lowered flat portion in which the opening means of the can end are arranged. The connecting web or connecting wall between said two curvatures extends at an angle of substantially between 40° and 60°, particularly about 45°, and forms a reinforcement in said elongated portions. In the short 3o edge portions of said depressed portion, no curvature and no substantial step (bend) exists, but an elastic surface being inclined to rise in a ramp shape, said surface having a width of substantially between 30% and 80% of a distance of the two curvatures on one side to said two curvatures on the other side of said depressed portion, the distance mentioned being located close to the short edge portions (claim 7).
3s A transitional portion between said step-shaped longer edge portions and said elastic ramp-shaped portion (claim 8, claim 9) extends at a radius, at which said inclined web between said two curvatures continuously looses its inclination and changes from an initially steep inclination angle to an angle of substantially 0° in relation to the central panel.
In an end portion of said longer edge portion, said web does not only extend at a changed inclination angle, but can also have an additional curvature to pass into an elastic ramp-shaped portion, particularly one half of a hypothetical imaginary curvature of 90° missing and in the remaining half portion, said steeply inclined connecting web continuously changing to said flat ramp-shaped portion (claim 9).
An alternative is provided by a web wall continuously changing in height, said wall not substantially changing its angle (claim 9, first alternative).
Together with a tool for shaping a can end, a method is described to the expert by which he may one of shape further and shape at all a can end, such that at least one of ~s those edge portions of said lowered portion which are positioned close to said damping bead are provided with an elastic transition instead of a step-shaped reinforced transition as the depressed portion has in the remaining portions corresponding to the longer edge portions.
zo A first upper die, which is arranged radially inside an annular supporting die, is provided with one of a shortened and height-reduced face in the portions which are positioned close to said damping bead, said face, when said die is closed in a bottom end position, leaving a more than parasitic gap between a lower counter-face of a supporting die required for coining or scoring and a short edge portion of an upper die. Said closed Zs position is the lower operating position in which the elongated faces shape the longer edge portions of said depressed portion, such that a step is obtained.
Preferably, the face at the two shorter edge portions of said upper first die is reduced in height, said face being particularly designed as a web which contacts said central panel only at its outer portion.
Radially outside of said annular lower supporting die, which has a positioning and supporting function, an annular centering die is provided, which engages in said damping bead to allow said central panel to be located with said first upper die on both sides of said annular supporting die.
The height-reduced short edge portion of said upper first die and a face of said die, respectively, may be inclined to extend at an angle relative with respect to an assumed extended supporting surface of one of said outer lower annular die and a lower counter-face of said lower first die. The angle is larger than zero, but only small, particularly in a range between 3° and 10° (claim 15). When the upper first die is equipped with a receiving space, in which opening means may be arranged, the web in said short edge portion close to said circumferential bead is provided with an inclined face.
In an s operating position (bottom position) of said upper first die, the outer end of said inclined face extends substantially on the same level as an upward directing face of said supporting die, being a second lower die, and the sheet thickness of said can end would have to be added, and consequently, the level would be higher by the sheet thickness, here, however, according to the invention, a tool without an inserted can end shall be described and claimed.
It is understood, that the central panel as a whole does not have an entire flat surface, but a surface which is slightly vaulted to the outside (in upward direction), which has a corresponding effect on the general design of the can end and the depressed flat ~s portion.
In the following, the invention is described in detail by several embodiments.
Figure 1 illustrates an embodiment of a can end having a circumferential step-shaped edge portion 41 adapted to delimit a flat portion 40 (depressed s panel) lowered from a central panel (10).
Figure 2 is a sectional view along a plane A-A of figure 1 showing shaping tools G,T,S used for shaping and clampingly supporting a can end, whereas dies R,H are advantageous but not necessarily required.
Figure 3 illustrates an embodiment of a can end being provided with elastic transitional portions 45,46 at the smaller sides delimiting said flat portion 40.
Figure 4a is a sectional view along A-A of figure 3.
Figure 4b is a sectional view along B-B of figure 3 showing the shaping tools G,T,S
and R,H, respectively, used for shaping and clampingly supporting a can ~s end.
Figure 5 is a cross-sectional view of an elastic edge portion 45 between a coined web 30 obtained by wear-hardening and a lowered flat portion 40 (depressed panel).
2o Figure 1 is an illustration of a sheet metal can end, having a flat portion 40 depressed over a circumferential step 41, said flat portion having an oblong shape. At its short edge portions 41 a, which have a strongly curved extension, said depressed flat portion is positioned very close to a circumferential groove 20 which is visible more clearly in a cross-sectional view according to figure 2, according to which said can end comprises 2s an edge 21 intended to be seamed to a can body, an anti peaking bead 20 (also called chuck groove or circumferential bead) and a central panel 10, which, in the cross-section of figure 2, is represented only by a short stripe portion 10a between the dies S
and R and then passes through a sharp step 41 a into said lowered flat portion 40 in which the opening means are arranged. Said opening means comprise a gripping tab 9 3o for opening the can by turning said tab and an opening portion 8 de>iined by score lines and stiffening lines in said lowered portion 40 and extending up to the other short end of said oblong flat portion 40 which approaches said circumferential bead 20 closely on the other side. Two longer edge portions are provided, having a slightly diverging extension and a considerably larger distance with respect to said circumferential bead 20. The 3s outer shape of said gripping tab 9 and said opening portion 8, partly overlapped by said tab, are adapted to said depressed flat portion.
The same can end as in figure 1 is shown in figure 3, having a modified design of said short edge portions. In figure 3, said step-shaped edge 41, shown in figure 1 as being continuous and comprising a double curvature 41',41 ", is interrupted in favor of a continuous ramp-shaped portion 45 and 46 respectively, on both ends of said s depressed flat portion 40 which is visible more clearly in figure 4a, illustrating a section A-A. A section B-B according to figure 4b illustrates the stepped shape, further maintained at two curvatures 43'43" closely adjacent and extending in parallel with respect to each other, and each having a radius which is sharply curved and faces in opposite directions at the edges of the corresponding shaping dies G and S in the long edge portion 43 and the opposite long edge portion 42, respectively.
The depressed flat portion 40, which, on two long edges 43,42 according to figure 3, has two elongated curvatures 43',43" illustrated in figure 4b, is provided with a ramp-shaped inclined portion 45 elastically connecting said depressed portion with the ~s remaining central panel 10, which is visible between the tools R and S in figure 4a.
Here, the short edge portion approaches the circumferential bead 20 very closely, such that any curvatures and steps are avoided to allow said ramp portion to vault elastically, when a pressure is applied. It was found that, when said portion is capable of elastic deformation, it is in a position to resist to higher pressures than when curvatures are zo provided, which curvatures are maintained in the remaining elongated edge portions 42,43 of said depressed flat portion 40, but are avoided on one of both sides as well as on both sides of said depressed flat portion 40 positioned close to said circumferential bead.
zs A tool comprising shaping dies and supporting dies is illustrated in figure 4a and figure 4b, only those portions of a usual tool being shown which, with respect to prior art, are modified in the sense of the proposed idea. The remaining components of the tool may be of a usual nature and shall not be described herein.
3o An inserted can end is supported on an annular die S, the outer shape of which is adapted to the shape of a vertical wall of said circumferential bead 20, which wall faces to the inside, said annular die, according to the two sectional views of figures 4a and 4b, having substantially larger long edge portions of said depressed flat portion 40, to support said central panel 10 entirely circumferentially. Radially outside of said 3s supporting tool S, a wedge-shaped annular die T extending in downward direction and engaging with its face 71a in said circumferential bead 20, is provided. In a closed position, i. e. in a lower lifting or operating position of said tool, said face 71 a is positioned on a lower level with respect to an upward directing face 61 a (longer side) and 61 b (smaller side) of said annular supporting die S. Radially inside said annular die S, an oblong depressing die is provided to operate as a shaping die G, determining with its geometry the geometry of the depressed flat portion 40. Said die is represented with two of its edge portions, a long edge portion 51 and a short edge portion 50, each s having a face 50a,51 a, for contacting a metal sheet to be shaped of said central panel 10. Below said upper shaping die G, a die H is shown, not being provided with a shaping function in the present embodiment, but having a counter-face 60 to serve as a relative object only for defining a horizontal plane. Said die H may serve as a supporting die for applying score lines in one of the depressed flat portion 40 and, before said flat portion is depressed, the central panel 10.
A further annular die R is shown. It is arranged opposite said lower annular die S and has a supporting function, but does not necessarily have to support said can end by contacting or force application on said supporting die S, when an annular centering ~s die T as well as a shaping die G shaping said depressed portion are positioned on both sides of said supporting die S.
Said shaping die G, which may forcibly act in a direction F along an axis extending substantially in perpendicular direction with respect to one of said central panel 10 and zo said counter-face 60 of said tool H, defines with the geometry of its face the shape of the edge portions of said depressed flat portion 40. The elastic portions 45,46 of figure 3 are visible in figure 4a, they are not shaped in steps but remain extending continuously in a ramp-shape and thus elastically between an illustrated bottom (on the right side of figure 4b) of said depressed flat portion 40 and the edge of said central zs panel. In figure 4b, however, it is clearly visible that two closely adjacent curvatures 43',43" cause sharp bends of the metal sheet with a connection web between said two curvatures, said web defining a long edge portion 42,43 of said depressed surface 40. Said connecting web between the curvatures illustrated in figure 3 extends at an angle of substantially 45°, which angle changes to 3o substantially 0° in a portion extending to said ramp portion 45.
Here, said long edge portions 42,43 are visibly curved, each corresponding to substantially one half of a curved circumferential extension of 90°, the remaining 45° are occupied by the halves 45a,45b, respectively, of said ramp 45.
3s As a connecting web, only portions 43a and 42a, respectively remain as curved end portions, respectively, of each long edge portion 43 and 42. The same applies to the other ramp 46 comprising two halves 46a,46b. Thus, the short stepped edge 41 a according to figure 1 is replaced by the upper portions 43a,45a,45b,42a which are symmetrical with respect to a longitudinal center plane A-A of the can end.
An inner receiving portion 52 of the upper shaping die G may be used for one of s receiving a gripping tab 9 and having a protecting function, to leave the score lines and bead geometry in the central panel 10, which were applied before depressing said portion 40, without contact and to contact the metal sheet only at the edge portion of said depressed portion 40.
A face 50a as web-shaped edge portion 50, which face, being a face of the upper die G, does not provide a depressed portion, extends at a small angle of preferably 5°, which may change in a range of up to 3° and up to 10° with respect to the lower counter-face 60 of the lower die H. Said angle alpha (a) is also visible in figure 5, having a ramp-shaped transition 45 of a portion of a can end shown in a sectional view similar to ~s figure 3.
Figure 5 shows the geometry of said ramp-shaped transitional portion 45, being additionally provided with an adjacent circumferential coined portion 30 which is illustrated asymmetrically in a cross-sectional view. A wear-hardened zone obtained by 2o said coining 30, which, in practice, only displaces material in a radial outward direction, such as it may be displaced by a wedge-shaped annular die, provides a mechanical stiff stripe which is neighbored by said elastic ramp portion 45 towards said depressed portion 40. The illustration of said coined annular portion 30 is exaggerated to make it clearly visible. Said damping bead 20 is substantially deep and small to fulfil its function.
Zs Sheet metal can ends described herein are substantially used for closing beverage cans, inside of which high pressures up to 6 or 7 bar may occur. However, other applications are not excluded.
Claims
We claim:
1. Can end for closing a beverage can made of sheet metal, comprising - from the inside towards the outside - a central panel (10), a circumferential damping bead (20) and an edge (21) for seaming, said can end having a flat portion (40), lowered with respect to a level of said central panel (10) and adapted to the shape of a gripping tab (9) and an opening portion (8), wherein said flat portion (40) is provided with longer (42,43) and shorter (45,46) edge portions, delimiting the flat portion with respect to a non-lowered remaining portion of said central panel (10); and wherein (a) at least one of said shorter edge portions (45) is smoothly inclined (alpha,.alpha.) to rise from the level of said lowered flat portion (40) to a plane of said central panel (10) positioned on a higher level, characterized in that (b) said at least one smoothly inclined edge portion (45) extends at an angle smaller than 10° in relation to a plane defined by said flat portion (40), for providing a transitional portion capable of elastic deformation when a surface pressure from a bottom of said can end is applied, and for being positioned below a gripping end of said gripping tab (9).
2. Can end made of sheet metal according to claim 1, wherein both said short edge portions (45,46) are inclined to rise smoothly.
3. Can end made of sheet metal according to one of the aforementioned claims, wherein two shorter edge portions are positioned closer to said damping bead (20).
4. Can end according to one of the aforementioned claims, wherein said longer edge portions (42,43) on a respective side are closely adapted to a shape of an edge of said gripping tab and said opening portion (8,9), the tab and the portion partly overlapping each other.
5. Can end according to one of the aforementioned claims, wherein an asymmetrically coined zone (30) is provided, extending between said smooth edge portion (45,46) and said damping bead (20) and considerably hardening the material in the transitional portion towards said damping bead (20), thus defining - starting at the radial inner end of said bead (20) and extending radially inward - firstly, a strong barrier zone (30) obtained by wear-hardening and subsequently, a transitional portion (45,46) towards said lowered flat portion (40), said transitional portion having a limited width and being capable of elastic deformation.
6. Can end according to one of the aforementioned claims, wherein said long edge portions (42,43) each substantially having a step from said lowered flat portion (40) to the level of said remaining central panel (10), particularly over two curvatures (43',43") spaced apart in a radial direction with respect to each other at which curvatures the metal sheet being strongly curved in opposite directions.
7. Can end according to one of the aforementioned claims, wherein said smoothly inclined portion (45,46) is ramp-shaped, particularly having a width of between 30% and 80% of a respective distance of the two longer edge portions (43,42).
8. Can end according to one of the aforementioned claims, wherein said longer edge portion (43,42) having an end portion (43a,42a), said end portion being shaped towards said shorter edge portion (45,46) through a curved extension having a radius, substantially one half of the length of said curved extension (circumferential segment) being provided as a transitional step between said lowered flat portion (40) and said remaining central panel (10), said step being between substantially not and not at all elastically deformable, and the remaining length of said curvature (45a,46a) defining said short edge portion (45,46) on that half of the can end which is smoothly inclined to rise between said lowered flat portion (40) and said remaining central panel (10).
9. Can end according to one of the aforementioned claims, wherein, in a respective zone delimiting said end (43a,42a) of said long step-shaped edge portion with respect to said short elastic deformable edge portion (45,46), one of a height of the step continuously decreases between a maximum height, defining the level of the lowered flat portion (40) substantially in the middle of said can end, and the absence of any step in said short edge portion (45,46);
and a connecting portion is provided, forming said step and having a continuously changing inclination, starting at a steep inclination angle of between 40° and 50° and changing to an inclination angle of substantially 0°.
11. Tool for shaping a can end having a central panel (10) and a deep circumferential bead (20) as well as an edge portion (21 ) radially adjacent to said bead, wherein (a) said tool having - in a radial direction from the inside towards the outside and in a relative position with respect to each other - a first upper die (G), a second lower die (S) and a centering ring die (T), having respective faces (50a,51a;61a,61b;71a);
(b) in a bottom end position (closed position), the face of said first upper die (G) and the face of said centering ring die (T) being located below the face (61a,61b) of said second lower die (S) to position said can end and to depress an inner flat portion (40) of said central panel (10) relative to the remaining portion of said central panel; but (c) at least one (50) of two edge portions of said first upper die (G), which portions are located one of close and closer to said centering ring die (T) having a face (50a) being reduced in height with respect to the remaining face (51a) of said upper first die (G), said remaining face (51a) being located more distant from said centering ring die (T), to leave in a portion of the central panel which is close to the circumferential bead a smooth transition (45,46) without a substantial step (sharp bend) from an edge of the central panel towards said depressed flat portion (40), and to provide in an edge portion of said depressed portion (40), which edge portion is located more distant from said circumferential bead, a stepped shape {42,43) to said depressed portion (40) by effect of the face (51 a) of said upper first die.
12. Tool according to one of claims 10 and 11, wherein said short and long edge portions (50,51) and the faces (50a,51 a) respectively of said upper first die (G) are designed as webs defining between them a receiving space (52) which is reduced in height.
13. Tool according to one of claims 10 and 11, wherein the face (50a) of said short edge portion (50), which is reduced in height, extends at a small angle (.alpha.,alpha) larger than zero in relation to said counter-face (60), particularly starting substantially on the level of the face (61b) of said second lower die (S), in a closed position corresponding to the bottom end position of a lifting range of the die.
14. Tool according to one of claims 10 and 11, wherein both short edge portions and both faces respectively of said upper first die (G) are reduced in height.
15. Tool according to one of claims 10 and 11, wherein the faces (50a) of said two short edge portions (50) of said first upper die (G) are inclined at an angle in relation to a counter-face (60) of said lower first die (H), said inclination angle particularly being between 3° and 10°.
16. Tool according to claim 10, wherein a centering ring (T) acting from above is provided around said second lower supporting die (S), for engaging in a bead (20) surrounding said central panel (10) of said can end and for supporting said can end in a relative position with respect to said second lower supporting die (S), when said first upper die (G) depresses said flat portion (40) from said central panel (10).
17. Tool according to one of claims 10 and 11, wherein at least one face (50a) of said first upper die (G), which face is located in an edge portion being closer to said centering ring die (T) engaging in said circumferential bead (20), remains substantially on the same level in a closed position of said tool, said level being the same on which the upward directing face (61b) of said second lower die (S) is located.
18. Tool according to one of claims 10 and 11, wherein said first upper die (G) has a substantially oblong shape, particularly having two slightly diverging longer side walls and two smaller side walls of different lengths.
1. Can end for closing a beverage can made of sheet metal, comprising - from the inside towards the outside - a central panel (10), a circumferential damping bead (20) and an edge (21) for seaming, said can end having a flat portion (40), lowered with respect to a level of said central panel (10) and adapted to the shape of a gripping tab (9) and an opening portion (8), wherein said flat portion (40) is provided with longer (42,43) and shorter (45,46) edge portions, delimiting the flat portion with respect to a non-lowered remaining portion of said central panel (10); and wherein (a) at least one of said shorter edge portions (45) is smoothly inclined (alpha,.alpha.) to rise from the level of said lowered flat portion (40) to a plane of said central panel (10) positioned on a higher level, characterized in that (b) said at least one smoothly inclined edge portion (45) extends at an angle smaller than 10° in relation to a plane defined by said flat portion (40), for providing a transitional portion capable of elastic deformation when a surface pressure from a bottom of said can end is applied, and for being positioned below a gripping end of said gripping tab (9).
2. Can end made of sheet metal according to claim 1, wherein both said short edge portions (45,46) are inclined to rise smoothly.
3. Can end made of sheet metal according to one of the aforementioned claims, wherein two shorter edge portions are positioned closer to said damping bead (20).
4. Can end according to one of the aforementioned claims, wherein said longer edge portions (42,43) on a respective side are closely adapted to a shape of an edge of said gripping tab and said opening portion (8,9), the tab and the portion partly overlapping each other.
5. Can end according to one of the aforementioned claims, wherein an asymmetrically coined zone (30) is provided, extending between said smooth edge portion (45,46) and said damping bead (20) and considerably hardening the material in the transitional portion towards said damping bead (20), thus defining - starting at the radial inner end of said bead (20) and extending radially inward - firstly, a strong barrier zone (30) obtained by wear-hardening and subsequently, a transitional portion (45,46) towards said lowered flat portion (40), said transitional portion having a limited width and being capable of elastic deformation.
6. Can end according to one of the aforementioned claims, wherein said long edge portions (42,43) each substantially having a step from said lowered flat portion (40) to the level of said remaining central panel (10), particularly over two curvatures (43',43") spaced apart in a radial direction with respect to each other at which curvatures the metal sheet being strongly curved in opposite directions.
7. Can end according to one of the aforementioned claims, wherein said smoothly inclined portion (45,46) is ramp-shaped, particularly having a width of between 30% and 80% of a respective distance of the two longer edge portions (43,42).
8. Can end according to one of the aforementioned claims, wherein said longer edge portion (43,42) having an end portion (43a,42a), said end portion being shaped towards said shorter edge portion (45,46) through a curved extension having a radius, substantially one half of the length of said curved extension (circumferential segment) being provided as a transitional step between said lowered flat portion (40) and said remaining central panel (10), said step being between substantially not and not at all elastically deformable, and the remaining length of said curvature (45a,46a) defining said short edge portion (45,46) on that half of the can end which is smoothly inclined to rise between said lowered flat portion (40) and said remaining central panel (10).
9. Can end according to one of the aforementioned claims, wherein, in a respective zone delimiting said end (43a,42a) of said long step-shaped edge portion with respect to said short elastic deformable edge portion (45,46), one of a height of the step continuously decreases between a maximum height, defining the level of the lowered flat portion (40) substantially in the middle of said can end, and the absence of any step in said short edge portion (45,46);
and a connecting portion is provided, forming said step and having a continuously changing inclination, starting at a steep inclination angle of between 40° and 50° and changing to an inclination angle of substantially 0°.
11. Tool for shaping a can end having a central panel (10) and a deep circumferential bead (20) as well as an edge portion (21 ) radially adjacent to said bead, wherein (a) said tool having - in a radial direction from the inside towards the outside and in a relative position with respect to each other - a first upper die (G), a second lower die (S) and a centering ring die (T), having respective faces (50a,51a;61a,61b;71a);
(b) in a bottom end position (closed position), the face of said first upper die (G) and the face of said centering ring die (T) being located below the face (61a,61b) of said second lower die (S) to position said can end and to depress an inner flat portion (40) of said central panel (10) relative to the remaining portion of said central panel; but (c) at least one (50) of two edge portions of said first upper die (G), which portions are located one of close and closer to said centering ring die (T) having a face (50a) being reduced in height with respect to the remaining face (51a) of said upper first die (G), said remaining face (51a) being located more distant from said centering ring die (T), to leave in a portion of the central panel which is close to the circumferential bead a smooth transition (45,46) without a substantial step (sharp bend) from an edge of the central panel towards said depressed flat portion (40), and to provide in an edge portion of said depressed portion (40), which edge portion is located more distant from said circumferential bead, a stepped shape {42,43) to said depressed portion (40) by effect of the face (51 a) of said upper first die.
12. Tool according to one of claims 10 and 11, wherein said short and long edge portions (50,51) and the faces (50a,51 a) respectively of said upper first die (G) are designed as webs defining between them a receiving space (52) which is reduced in height.
13. Tool according to one of claims 10 and 11, wherein the face (50a) of said short edge portion (50), which is reduced in height, extends at a small angle (.alpha.,alpha) larger than zero in relation to said counter-face (60), particularly starting substantially on the level of the face (61b) of said second lower die (S), in a closed position corresponding to the bottom end position of a lifting range of the die.
14. Tool according to one of claims 10 and 11, wherein both short edge portions and both faces respectively of said upper first die (G) are reduced in height.
15. Tool according to one of claims 10 and 11, wherein the faces (50a) of said two short edge portions (50) of said first upper die (G) are inclined at an angle in relation to a counter-face (60) of said lower first die (H), said inclination angle particularly being between 3° and 10°.
16. Tool according to claim 10, wherein a centering ring (T) acting from above is provided around said second lower supporting die (S), for engaging in a bead (20) surrounding said central panel (10) of said can end and for supporting said can end in a relative position with respect to said second lower supporting die (S), when said first upper die (G) depresses said flat portion (40) from said central panel (10).
17. Tool according to one of claims 10 and 11, wherein at least one face (50a) of said first upper die (G), which face is located in an edge portion being closer to said centering ring die (T) engaging in said circumferential bead (20), remains substantially on the same level in a closed position of said tool, said level being the same on which the upward directing face (61b) of said second lower die (S) is located.
18. Tool according to one of claims 10 and 11, wherein said first upper die (G) has a substantially oblong shape, particularly having two slightly diverging longer side walls and two smaller side walls of different lengths.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19812671 | 1998-03-23 | ||
| DE19812671.9 | 1998-03-23 | ||
| DE19833492A DE19833492A1 (en) | 1998-03-23 | 1998-07-24 | Closure cover made of sheet metal with a lowered opening area |
| DE19833492.3 | 1998-07-24 | ||
| PCT/DE1999/000826 WO1999048630A2 (en) | 1998-03-23 | 1999-03-22 | Sheet-metal closing lid with slightly inclined surface area and tool for producing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2325419A1 true CA2325419A1 (en) | 1999-09-30 |
Family
ID=26044887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002325419A Abandoned CA2325419A1 (en) | 1998-03-23 | 1999-03-22 | Sheet-metal closing lid with slightly inclined surface area and tool for producing the same |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1082184A2 (en) |
| CN (1) | CN1091012C (en) |
| AU (1) | AU4129999A (en) |
| BR (1) | BR9908952A (en) |
| CA (1) | CA2325419A1 (en) |
| PL (1) | PL343415A1 (en) |
| WO (1) | WO1999048630A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6315511B1 (en) * | 1999-07-15 | 2001-11-13 | William L. Taube | Method and apparatus for coining end panels of containers |
| DE10261232A1 (en) * | 2002-12-20 | 2004-07-22 | Wichelhaus, André | Closure for a container |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280427A (en) * | 1979-01-29 | 1981-07-28 | Crown Cork & Seal Company, Inc. | Easy open can end |
| US4901880A (en) * | 1989-01-09 | 1990-02-20 | Adolf Coors Company | Score line groove for container end members |
| US5219257A (en) * | 1990-11-21 | 1993-06-15 | Koch Systems Incorporated | Self-opening can lid with improved contour of score and means for making |
| WO1995010373A1 (en) * | 1993-10-08 | 1995-04-20 | Schmalbach-Lubeca Ag | Subsequent working process for a tin sealing cap |
-
1999
- 1999-03-22 AU AU41299/99A patent/AU4129999A/en not_active Abandoned
- 1999-03-22 EP EP99924666A patent/EP1082184A2/en not_active Withdrawn
- 1999-03-22 CA CA002325419A patent/CA2325419A1/en not_active Abandoned
- 1999-03-22 BR BR9908952-1A patent/BR9908952A/en unknown
- 1999-03-22 WO PCT/DE1999/000826 patent/WO1999048630A2/en not_active Application Discontinuation
- 1999-03-22 PL PL99343415A patent/PL343415A1/en unknown
- 1999-03-22 CN CN99804233A patent/CN1091012C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR9908952A (en) | 2000-11-28 |
| PL343415A1 (en) | 2001-08-13 |
| WO1999048630A2 (en) | 1999-09-30 |
| EP1082184A2 (en) | 2001-03-14 |
| AU4129999A (en) | 1999-10-18 |
| CN1091012C (en) | 2002-09-18 |
| CN1293602A (en) | 2001-05-02 |
| WO1999048630A3 (en) | 1999-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |