DE2728592A1 - TUBULAR PRESSURE TANK - Google Patents

Description

Patent attorneys Dipl. -Ing. Curt Wallach

Dipl.-Ing. Günther Koch

2728592 Dipl.-Phys. Dr Tino Haibach

ο Dipl.-Ing. Rainer Feldkamp

D-8000 Munich 2 ■ Kaufingerstraße 8 ■ Telephone (0 89) 24 02 75 Telex 5 29 513 wakai d

_Date: June 24, 1977

Our reference: 15 9 ^ 5 - Κ / Αρ Union priority

Date: June 25, 1977

Country: Orobri tannien File number »26451/76 Designation: tubular pressure vessel Applicant: Metal Box Limited, Reading RGl Berkshire, England Inventor: Martin Frank Ball, Welwyn Garden City, Hertfordshire, England

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The invention relates to an end wall for a tubular pressure vessel and in particular, but not exclusively to the end wall of a can, and the invention also relates to cans with such Front wall *

There are known metallic cylindrical pressure vessels, the convex end walls with a semi-elliptical cross-section have, the length of the major axis of the ellipse corresponding to the diameter of the cylindrical body. The perimeter section the end wall is butt welded onto the cylindrical body. To the one taken by the pressure vessel To keep space as small as possible, it is desirable to use end walls in which the relationship between the main axis and minor axis of the ellipse is greater than the preferred 2: 1 ratio. However, if the ratio is decreased, so will that the end wall becomes flatter, then a sufficient metal thickness must be provided to ensure the stability of the end wall to ensure under load. For example, a front wall with an elliptical cross-section with a ratio between Major axis and minor axis of 10: 1 a metal thickness two hundredths of the length of the minor axis.

A known end wall of a can suitable for beer has two special sections, namely a peripheral section for attachment to the cylindrical part of the container and a central flat closure plate that extends from the peripheral section surrounded and worn. However, if the support for a flat central plate is stiffened, then it becomes a point reached under excessive pressure conditions at which the tire tension, caused by external distortion of the flat plate, results in local bulges.

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With the end wall designs used today, the errors in the middle panels are considerably lower than errors of the supporting structure running all around. At the proposed Training will to a greater extent the potential strength of the support ring structure is used in which a central plate is provided «which effectively reduces the load on the peripheral element introduces «so that thinner sheet metal can be used and still achieve a satisfactory strength will.

According to a first feature of the invention, an end wall or a lid for a cylindrical container created "which has a peripheral portion and a central plate portion having. The arrangement is made in such a way that the circumferential section has a cover hook and a counter-pulled one Has wall and a beaded edge without stress peaks is used to connect the lid to the container by means a double hem and the middle plate is also supported by this «, this middle plate showing a semi-elliptical section.

According to a preferred embodiment of the invention, the main axis of the ellipse runs diametrically over the container body.

According to a further preferred embodiment of the invention the ratio between major axis and minor axis of the sectional ellipse is greater than 10: 1 and a preferred value is 21: 1. In accordance with another feature of the invention, there is provided a cylindrical container having a lid according to FIG The above identification has "whose central section has a semi-elliptical cross-section," with the peripheral section of the lid is fixed on the side walls by means of a double hem.

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Exemplary embodiments of the invention are described below with reference to the drawing. In the drawing show:

Fig. 1 is a sectional view of a known, welded, cylindrical pressure vessel;

2 shows a partial section of a known beer can;

Figure 3 is a sectional view of one constructed in accordance with the invention Container lids;

4 shows a seat corresponding to FIG. 2 in a modified embodiment.

According to FIG. 1, the cylindrical pressure vessel has a convex one Cover 1, which is connected to a cylindrical body 3 by a circumferential weld seam 2. The cross section of the Lid 1 has the shape of a half ellipse, the main axis of the ellipse being the same length as the diameter and runs along the diameter. The ratio between the major axis and minor axis of the cut ellipse is about 3: 2 and the convex end portion is relatively high.

In Fig. 2 a beer can is shown which carries a cover 4 on a can body 5, which are connected to one another by a double seam 6. The end section 4 is punched out of a tinplate of 0.4 mm cleaned by nitro and the lid has a flat end plate 1 which is surrounded by a flanged edge 8 and is made in one piece with this and connects to the flanged edge 9 of the cylindrical vessel. The beaded edge 9 is encompassed by the double seam 6 of the lid. Such a sleeve is able to withstand pressures of the order of 3> 2 kg / cm. However, you can

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Excessive internal pressures within the liner remove the cap 7 and the tire stresses that are generated in the process can cause local hump formation in the VerechluSdeokels 7 cause and also have a hump formation on the beaded edge 8 result.

In Fig. 3 is a can cover with about 127 mm in diameter shown which is made of tinplate 0.3 mm thick was punched out and this cover has a peripheral edge portion 10 and a closure plate 11 of semi-elliptical cross section. The peripheral section 10 has an annular cover hook 12 and a cylindrical wall 13 provides the connection with a bead 14 which establishes the connection to the Versohlußplatte 11. The closure plate 11 spans the area within the inner circumference of the beaded edge 14 and has the cross-sectional shape of a semi-ellipse. The ratio of the major axis to the minor axis of the ellipse is 21: 1..When the convex plate surface on the countersink block of the tool, then it is within the height of the recessed wall and therefore not above the Cover hook 12 in front. The convex surface can spring back into a flatter elliptical shape when it is removed from the tool die, which has an axis ratio on the order of 25: 1. Therefore, if the lid of FIG. 3 with a If the bushing is connected via a double hem, then the convex surface lies below the surface of the double hem and is protected by the double seam when filled cans are stacked on top of one another, as is the case with the known one The bushing according to FIG. 2 is the case.

This stacking requirement for filled cans results in a limitation in view of an acceptable convex height of the semi-elliptical closure plate 11. It has been found that a range of ratios for an acceptable lid thickness

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between the main axis and the minor axis between 10: 1 and 21.6: 1 is permissible for the die tool. A relationship 21: 1 is preferred for can ends with a diameter of 133 * 35 mm. Such a lid has a sufficient one Stability to take advantage of the strength of a peripheral edge that supports it. The bead 14 has an inner radius R according to FIG Fig. 3, which is about 1 mm and the circumference of the elliptical Closure plate 11 merges into the cylindrical recessed wall 13. A short cylindrical section can can expediently be used to connect the flanged edge 14 to the closure plate 11, as is the case at C in FIG. 3 can be seen.

In the modified embodiment according to FIG. 4, the socket cover consists of a modified circumferential section 20 and a modified shutter plate 21 semi-elliptical Cross-sectional. The circumferential section 20 has a cover edge 22, which is hook-like in cross section and is frustoconical Recessed wall 33 * which attaches to the inside of the part 22 and a rolled edge 24 that connects the wall 23 with the closure plate 21 connects.

The frustoconical retracted wall 23 extends downward and inward in connection with a rolled edge the radius R, as in Fig. 3 and it can be a Versohlußdeckel find application with a smaller diameter. Therefore, the ratio between major axis and minor axis of the semi-elliptical cross section of the closure plate can be reduced, if so desired. The socket cover according to FIG. 4 requires less metal than the socket cover according to FIG. 3.

Also in the embodiment according to FIG. 4, the Can end when stacked in a feed container of a trimming machine, which aligns the lid edges in the

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Engage the next rifle without wedging, leaving space saved and the transport is simplified.

According to the embodiment described, the lids are made of tinplate. The same application principles can be used however, can be used for liner covers made of other metals, for example aluminum. In addition, the combination a closure plate of semi-elliptical cross-section and a circumferential support wall are also used in containers are drawn from sheet metal. The side wall of such a drawn container then extends from the outer periphery of the hook cross-section 12 and 22 according to FIGS. 3 and 4 downwards.

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Lee AO

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Claims (1)

27285S2 Patent claims: 1. Socket cover for cylindrical pressure vessels with one overlying the beaded edge of the liner Cover edge »of an inwardly drawn-in wall and a rolled edge that turns into a convex central Plate passes, characterized in that the central plate has a cross section of a Possesses semi-ellipse. Socket cover according to claim 1,
characterized in that the inwardly drawn-in wall from the cover edge is cylindrical and the transition rolled edge after the central cover part has a semicircular cross-section, the central section of semi-elliptical cross-section spanning the space within the rolled edge. Socket cover according to claim 1,
characterized in that the wall drawn inward from the cover edge is frustoconical and the connection between the inner end of the wall after the central middle section of semicylindrical cross section is via a rolled edge of circular arc-shaped cross section, the central section spanning the space within the rolled edge. 709881 / 10U
ORIGINAL INSPECTED 4. Bush cover according to one of claims 1-3 * characterized in that that the main axis of the ellipse spans the opening of the sleeve diametrically 5. can cover according to one of claims 1-4 « characterized in that the ratio between major axis and minor axis the section ellipse lies within the range of IO: 1 and 25: 1. 6. Bush cover according to claims 1-5, characterized in that that a cylindrical portion (C) the rolled edge (14) with the circumference of the central end plate (11) connects. 709881 / 10U