JPH06156467A - Container for drink - Google Patents

Abstract

PURPOSE: To provide a beverage container with increased strength in the dropping resistance and having the bottom shape suitable for thinning a thickness of a material to be used therefor. CONSTITUTION: A container 10 comprising a cylindrical side wall 12, an annular supporting portion 16 connected to the side wall 12 by an outer connection port 28, a domed panel 38 radially mounted inside of the annular supporting portion 16, and an inner connection port 40 connecting the domed panel 38 to the annular supporting portion 16, is manufactured in accordance with the dimensions shown in a table, to achieve the beverage container improved in the dropping resistance while using a material having a thickness same as or thinner than that of a material used for a conventional container.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates generally to a metal container body of the type having a seamless sidewall and a bottom integrally formed with the sidewall. More specifically, the present invention relates to a bottom shape with enhanced drop strength.

[0002]

2. Description of the Prior Art Many container shapes have been manufactured to date, especially by means of a tooth space container maker. A tool case has a body having an integrated bottom wall at one end,
And a container having an opposite end formed to have a lid secured to the body. A container maker is a container made of steel or aluminum alloy and filled with various beverages.
The most ideal type of container bottom wall would be a flat wall that provides maximum capacity for a constant container of minimum height. However, such a container is economically impossible. This is because to prevent deformation, the bottom wall must be thick enough to make the cost of the container prohibitively high. In order to avoid such high cost, the drawing method and the ioning method are used, and recently, they are widely used especially in the aluminum container industry. In the manufacture of these containers utilizing plucking and ionization, it is important that the body wall and bottom wall of the container be as thin as possible to allow the container to sell at a competitive price. A great deal of effort has been made so far for reducing the thickness of the main body wall.

Although various bottom wall geometries have been developed to date for thin body wall construction, container strength is the most important factor in these developments. The first attempt in seeking sufficient rigidity of the bottom wall was
The bottom wall was formed into a spherical dome shape. This general shape is shown in Dan et al., U.S. Pat. No. 3,760,751 (September 25, 1973). According to this, the bottom wall is provided on the inside with a concave dome or indentation, which substantially comprises the entire bottom wall of the container. As a result, this
The shape of the mud shape is in the pressure range where the container is designed,
The strength of the bottom wall is increased and the deformation of the bottom wall is endured without changing the overall shape and size of the bottom wall. Various improved dome-shaped bottom walls have been manufactured. In this case, the dome structure itself is usually integrally formed at various angles with respect to the longitudinal axis of the container by using other curved or wall members to further strengthen the container structure. Although such improvements have improved stiffness as well as stability, these properties can still be achieved and in some respects can be further improved with the minimum required metal. It turns out.

Although this dome shape has made it possible to reduce the metal thickness to some extent in the container maker, the container maker does not sacrifice the container strength and further increases the metal thickness. We are continuing to study technologies that bring about reductions. Shape optimization is not an easy task. Prior art suggesting a dome-shaped bottom is also described in P. G. Stefan, U.S. Patent No. 3,
349,956 (October 31, 1967); Neusel et al., U.S. Pat. No. 3,693,828 (197).
September 26, 2); Dan Etoile, U.S. Pat. No. 3,
730,383 (May 1, 1973); Tokmanian, U.S. Pat. No. 3,904,069 (September 9, 1975); Ruet et al, U.S. Pat. No. 3,942.
673 (March 9, 1976); Mira et al., U.S. Pat. No. 4,294,373 (October 13, 1981).
Sun); Macmillan, US Pat. No. 4,834,256
(May 30, 1989); and Parsianie Tor-
U.S. Pat. No. 4,685,582 (August 11, 1987) and Patent No. 4,768,672 (September 6, 1988).

A patent for disclosing a device for forming a container having a dome-shaped bottom and for disclosing a container having a dome-shaped bottom is described by Mider et al., US Pat.
89,014 (September 15, 1981); Rubber Bath, U.S. Pat. No. 4,341,321 (July 27, 1982).
Date); Erato et al, U.S. Pat. No. 4,372,
143 (February 8, 1983); and Prussian ether, U.S. Pat. No. 4,620,434 (November 4, 1986).

US Pat. No. 3,349,956 discloses the use of a reduced diameter annular support section with an inwardly facing dome-shaped bottom located in the middle of the reduced diameter annular support section. ing. Stefan also discloses stacking annular support portions of reduced diameter inside the double seamed top of another container. U.S. Pat. No. 3,693,828 Neusel et al. Discloses an annular support portion having a conical bottom portion to reduce the diameter, and an inwardly facing dome-shaped bottom portion of the annular support portion in the radial direction. Discloses a steel container disposed inside the. Various shapes of the bottom have been adjusted to provide more uniform coating on the inner bottom surface, including radius reduction of the dome-shaped bottom.

Instead of the conical part of the Neusel et al US Pat. Nos. 4,685,582 and 4,768,6
No. 72, the Prussian et al. Discloses the installation of a conversion section between the cylindrical body of the container and an annular support section of reduced diameter, which conversion section is convex with respect to the outer diameter of the container. And a second annular arcuate portion that is convex with respect to the outer diameter of the container.

Macmillan in US Pat. No. 4,834,256 provides a conversion section between the cylindrical body of the container and an annular support section of reduced diameter, the conversion section having a double seam smaller than the cylindrical body. A container having a top can be stably stacked, and a container having a double seamed top having the same diameter as that of a cylindrical main body can be stably stacked. In this design, the reduced diameter container of the top is stacked inside the reduced diameter annular support portion. And a container with a relatively large top is stacked on this specially formed conversion part. Prussian ether, U.S. Pat. No. 4,62
Numerous prior art patents, including 0,434, disclose shapes designed to increase the pressure at which the liquid in the container reverses the dome at the bottom of the container. This pressure is static
It is called pressure reversal pressure. In this patent, the shape of the transducing part is so emphasized that it is usually defined within a certain range, but the radius of the dome-shaped panel is not specified. As mentioned above, one of the problems is getting the maximum dome reversal pressure for a given metal thickness. However, another problem is obtaining crush resistance when a container filled with contents falls on a hard surface. More specifically, another problem is the resistance to structural damage caused by the combination of the drop of the container on a hard surface and the internal fluid pressure in the container, which internal fluid pressure depends on the type of beverage and the temperature of the beverage. Given as a function of.

When the container is shipped in a ball carton, damage to the container can be prevented by the elastic energy of the carton material. However, if the car
If the material is thin, or if the container is not shipped in a container with ball paper and is shrink-wrapped with a plastic film, the drop resistance of the container becomes dangerous and is more than the dome reversal pressure. Even more dangerous. The current industrial test for drop resistance is called cumulative drop height. In this test, the filled container is first dropped onto the rigid plate from a height of 3 inches, with each subsequent drop increasing the drop height by 3 inches. The drop height resistance is the total distance over which the container is dropped, and includes the height at which the dome is inverted or partially inverted. That is, the drop height resistance is a cumulative height in a state where the bottom shape is considerably damaged and cannot be upright firmly in a plane shape. Furthermore, in the cumulative drop height test, the internal fluid pressure of the beverage strictly controls the rising pressure by controlling the temperature of the beverage. Therefore, container failure occurs due to a combination of internal fluid pressure due to the internal force of the fluid in the container as well as the stress induced by the impact of repeated drop tests.

[0010]

The conventional stacked state of the containers will be described with reference to FIGS. 4 and 5. The upper container of the container 10 is stacked on the lower container of the container 10 such that the outer connecting portion 54 of the upper container of the container 10 is placed inside the double seamed top 56 of the lower container of the container 10. The containers 10 arranged next to each other and vertically stacked are bundled by using shrink-wrapping plastic 60 to form a packaged product 58. This method of packaging is more economical than the previous method of packaging, but the potential for damage from rough handling becomes a problem. Therefore, the requirement regarding the drop strength of the container 10 becomes more stringent. As is well known, a large number of containers are manufactured throughout the year and the manufacturers are constantly striving to reduce the amount of metal used in container fabrication while still maintaining the same handling characteristics. Due to the large quantity of containers produced, even a slight reduction in metal thickness, for example 1 / 21000th of an inch, can substantially reduce manufacturing costs.

[0011] Therefore, the present invention provides a container having a bottom shape which has a high drop strength and which can reduce the thickness of the material used.

[0012]

SUMMARY OF THE INVENTION The beverage container of the present invention comprises an annular support portion, a sidewall, disposed about a vertical axis and including an annular support surface disposed about the vertical axis and at a right angle to the vertical axis. An outer connecting part interconnecting the ring and the annular support part, a concave panel located inside the annular support part and connected to the annular support part, extending inside the container, connected to the concave panel, and It has an internal connection with a concave panel located at a stereotactic distance from the support surface. More specifically, the beverage container of the present invention increases the drop strength of the container by increasing the curvature of the concave panel to a certain extent and reduces the dome reversal pressure of the container due to increased pressure. Further, the fixed position distance from the supporting surface to the curved portion is increased to increase the dome inversion pressure of the container.

The beverage container of the present invention reduces the curvature of the concave panel and increases the drop strength of the container, thus increasing the curvature reduces the dome reversal pressure of the container. And increasing the home position distance from the support surface to the concave panel to at least partially prevent the drop in container dome reversal pressure due to the increased curvature of the concave panel. The beverage container of the present invention is substantially cylindrical and includes side walls coaxially arranged about a vertical axis, an annular support surface perpendicular to the vertical axis, and inwardly and upwardly from the support surface. An annular supporting part having a convex annular part arranged around a curved vertical axis, an external connecting part interconnecting the side wall and the supporting part, a radius having a substantially spherical shape and having a convex shape. Concave panel located inwardly in the direction, concave annular section circumferentially arranged around the concave panel, connected to the concave panel and curved downward in the direction of the convex annular section, convex It has a circumferential inner wall connected to the annular portion, extending upwardly from the convex annular portion and connected to the concave annular portion.

More specifically, in the beverage container of the present invention, when the radius of curvature of the concave panel is reduced to a certain range in order to increase the drop strength, the dome reversal pressure of the concave panel is reduced due to the decrease of the radius of curvature. Is reduced. Therefore, the inner wall height is increased to increase the dome reversal pressure of the concave panel.

One method has been taken to increase the strength of the beverage container of the present invention, in which the container is positioned about a vertical axis, a sidewall, about the vertical axis and about the vertical axis. A support portion having an annular support surface,
An external connection part connecting the sidewall to the support surface, a concave panel located inside the annular support part, as well as connected to the annular support part, extending inside the container and concave at a fixed distance from the support surface. It has an internal connection part where the panel is arranged. More specifically, in the beverage container of the present invention, the drop strength of the container is increased by increasing the concave panel curvature and by limiting the increase to an acceptable drop in dome reversal pressure. In the beverage container of the present invention, the dome reversal pressure of the container is increased by increasing the home position distance from the support surface to the concave panel. In the beverage container of the present invention, the container
The inversion pressure as well as the drop strength are optimized by increasing the curvature of the dome-shaped panel to a certain curvature, in which the inversion pressure caused by the relatively small curvature is subtracted from the inversion pressure, Thereby increasing drop strength and increasing the home position distance from the support surface to at least partially compensate for the drop in dome reversal pressure.

In the beverage container of the present invention, the container has a first diameter and is an ordinary cylindrical side wall arranged circumferentially about a vertical axis, arranged circumferentially about a vertical axis, It is arranged radially inward from the side wall,
An annular portion having an outer convex annular portion and having an inner convex annular portion disposed radially inward of the outer convex annular portion and attached to the outer convex annular portion to support the container, a sidewall. Radial to a line tangent to the upper convex annular portion for connecting the outer convex annular portion and the side wall to the outer convex annular portion of the annular support means. An external connection portion having a concave annular portion disposed inwardly, generally in the shape of a sphere, a dome-shaped panel disposed radially inward of the annular support means and curved upward with respect to a vertical axis, And an interconnecting portion having a circumferential inner wall extending generally upward with respect to the vertical axis for connecting the dome-shaped panel to the annular support means. And the dome-shaped panel has a dome radius smaller than the average diameter of the container.

The present invention is a beverage container capable of substantially withstanding dome inversion upon impact, having a seamless cylindrical side wall, the bottom wall having a lower end portion thereof. And an outer connecting member formed integrally with the side wall and extending downwardly and inwardly from the side wall toward the vertical axis of the container, the outer connecting member having an upper convex portion having an inner radius. An annular bottom member having a lower concave portion with an outer radius, the radii being substantially equal, connected together and extending downwardly from the lower concave portion and having support means for the container, It has a conical surface integrally connected to the annular bottom member and extending upwardly and inwardly from the annular bottom member, said conical surface forming a slight angle with respect to the vertical axis of the container. The container then has a downwardly concave central panel integrally connected to the conical surface and extending upwardly and inwardly from the conical surface. And the radius of curvature of the downwardly concave center panel is substantially less than or equal to the diameter of the annular support surface.

[0018]

Embodiments will be described with reference to the drawings. These shapes are described in US Patent Nos. 4,685,582, 4,768,6.
FIG. 6 is a detailed view of the lower part of the beverage container common to the Prussian et al. 72 and 4,620,434 and embodiments of the present invention. More specifically, FIG. 1 is common to the aforementioned prior art and FIG. 2 is unique to the present invention. 3 shows, in an enlarged view, the partial details common to FIGS. 1 and 2. The present invention differs from the prior art primarily by selecting some of the parameters shown in FIGS.
The following description refers to all of these drawings unless otherwise stated. And some of the dimensions associated with FIGS. 1 and 2 are shown only in FIG. 3 to avoid crowding. Continuing to refer to FIGS. 1 to 3, the beverage container 1 of the drawing process and the ioning method is used.
0 is a generally cylindrical side wall ₁ having a first diameter D ₁ and arranged circumferentially about a vertical axis 14.
2, as well as an annular support portion, which is arranged circumferentially around the vertical axis 14 and radially inward of the side wall 12 and which is provided with an annular support surface 18 corresponding to the reference line 19, ie an annular support means. It has 16.

The annular support portion 16 is preferably an outer convex annular portion 20 which is preferably arcuate as well as an inner convex portion which is preferably arcuate and is located radially inward of the outer convex annular portion 20 and connected to the outer convex annular portion 20. It has an annular portion 22. The outer 20 and inner convex annular portions 22 have radii R _{1 and} R ₂ with a common center of curvature. More specifically, the radii R _{1 and} R ₂ both have the center of curvature of the point 24 and the rotation circle 26 of the point 24. This rotating circle 26 has a second diameter D ₂ . External connecting portion, or outer connecting means 28 bow is desirable, a radius R _3, and Saidowo - has an upper convex annular portion 30 connected to Le 12. The outer connecting portion 28 is also tangent 34, that is, the tangent 3 tangent to the outer convex annular portion 20 and the upper convex annular portion 30.
4 has a concave annular portion 32 arranged radially inward from a conical surface 36 which is rotated. As a result, the external connection means 28 connects the side wall 12 to the external convex annular portion 2.
Connected to 0. Dome shaped panel, ie concave panel 3
8 is preferably a spherical shape, but may be a curved shape having an appropriate radius of curvature. That is, the dome radius R ₄ is arranged radially inside the annular support portion 16 and
Curved upward of 0. That is, the dome-shaped panel 38 is curved upward in the direction of the vertical axis 14 when the container 10 is placed in the upright position.

The container 10 further comprises an inner connecting portion, namely an inner connecting wall 40 having a circumferential inner wall or a cylindrical inner wall 42 having a height L ₁ extending upward in the direction of the vertical axis 14. Have. The inner wall 42 may be cylindrical, or it may be conical inclined inward toward the vertical axis 14 at an angle α ₁ . Internal connection part 4
0 also has radius R ₅ and inner wall 42 and door
Inner concave shaped portion 44 interconnecting mu-shaped panels 38
have. Thus, the internal connection portion 40 connects the dome-shaped panel 38 to the annular support portion 16. The internal connecting portion 40 positions the outer periphery 45 of the dome-shaped panel 38 at a localization distance L ₂ from the reference line 19. As shown in FIG. 3, the localization distance L ₂ is the height L ₁ of the inner wall 42, the radius of curvature R ₅ of the inner concave annular portion 44, the radius R _{2 of} the inner convex annular portion 22 and the inner convex shape. It is approximately equal to or somewhat lower than the total material thickness of the annular portion 22. And as can be calculated by trigonometry, the localization value distance L ₂ is the angle alpha ₁ of the function, and de - the total periphery 45 of the domed panel 38 as a function of the angle alpha ₃ connected to the internal concave annular portion 44 Is less than. For example, the radius R ₅ of the inner concave annular portion 44 is 0.050 inch and the inner convex annular portion 22 is
If the radius R ₂ is 0.040 inches and the material thickness of the inner convex annular portion 22 is about 0.012 inches, the localization distance L ₂ is about 0 less than the height L ₁ of the inner wall 42. .10
Two inches larger or somewhat lower. Alternatively, when the radius and the metal thickness are as described above, when the height L ₁ of the inner wall 42 is 0.060 inch, the localization distance L ₂ is about 0.
162 inches or a little lower.

The annular support portion 16 is an outer convex annular portion 20.
And the arithmetic mean diameter D ₃ found at the junction of the inner convex annular portion 22. Therefore, this average diameter D ₃ and circle 2
The diameter D ₂ of 6 is the same diameter. The dome radius R ₄ lies on the vertical axis 14. The concave annular portion 32 is the outer convex annular portion 2
Above 0, it has a circumferential outer wall 46 extending outward from the vertical axis by an angle α ₂ and has a lower concave annular portion 48 with a radius R ₆ . Further, the concave annular portion 32 has a lower portion of the upper convex annular portion 30 depending on the choice of the size of the angle α ₂ , the radius R _{3 and the} radius R ₆ . Finally, the container 10 has a dome height measured from the support surface 18 to the dome shaped panel 38, ie, the panel height H ₁ , and a post diameter of the inner wall 42, ie, a relatively small diameter D ₄ . Have The upper convex annular portion 30 is a side wall 12
And the convex surface has a center 50. This center 5
0 is at a height H _{2 above} the support surface 18. The concave center 52 of the lower concave annular portion 48 lies on the diameter D ₅ . This center 52 is below the support surface 18. That is, the support surface 18 is at a height H ₃ from the center 52.

Here, referring to FIG. 1 and FIG.
In the prior art, the following dimensions were used. Ie D₁
= 2.597 inches; D₂, D₃= 2.000 inches; D
_Five= 2.365 inches; R₁, R₂= 0.040 inch;
R₃= 0.200 inch; R_Four= 2.375 inches; R_Five
= 0.050 inch; R₆= 0.100 inch; and
α ₁= Less than 5 degrees. R_FourIs 2.375 inches, but actually
Note that the touring radius was 2.12 inches
Should. Referring again to FIGS. 1 and 2, the book
The following dimensions were used in the examples of the invention. D₁=
2.598 inches; D₂, D₃= 2.000 inches; D_Four
= 1.882 inches; D_Five= 2.509 inches; R₁, R
₂= 0.040 inch; R₃= 0.200 inch; R_Four=
2.375 inches; R_Five= 0.050 inch; R₆= 0.
200 inches; H₁= 0.385 inch; H₂= 0.37
0 inch; H₃= 0.008 inch; α₁= 5 degrees 9 minutes; average
Binini α₂= 30 degrees. R_FourIs 2.375 inches, but
Note that the touring radius was 2.12 inches.
You should see it.

The following dimensions were used in the test runs for the present invention. D ₁ = 2.598 inches; D ₂ , D
₃ = 2.000 inches; D ₅ = 2.509 inches; R ₁ ,
R ₂ = 0.040 inch; R ₃ = 0.200 inch; R ₅
= 0.050 inches; R ₆ = 0.200 inches; H ₂ =
0.370 inch; H ₃ = 0.008 inch; and α ₂
= 30 degrees. The dimensions other than R ₄ , D ₄ , H ₁ , α ₁ , L ₁ , etc., as well as the thickness of the material used for the test are indicated in the tables shown in FIGS. 10 to 19 together with the test results. . In each table, static dome reversal pressure (S.D.
R) is shown in pounds per square inch, cumulative drop height (C.D.H.) is shown in inches, and the internal pressure (IP) at which the cumulative drop height test was performed is pounds per square inch. Indicated by. Here, referring to Tables 1 to 10 shown in FIGS. 10 to 19, the radius of curvature R of the dome-shaped panel 38 is shown.
₄ is the actual radius of curvature of the container measured, not the radius of curvature of the dome ring. For example, the radius of curvature R ₄ 2.375 inch tool has a radius of 2.120 inches - made using Le. The difference in the radii of curvature of the container and the touring is similar in prior art containers.
Table A of Figure 22 is tool - de exemplary ring radius and the container - a comparison table between the beam radius R _4.

Therefore, the radius of curvature R of 2.375 in Table A is
₄ indicates that the radius of the dome ring was 2.120 inches, comparable to prior art containers. And the improvement of the present invention can be seen by comparing the radius of curvature R ₄ of 2.375 inches with other radii of curvature. The tests in Tables 1 to 10 were performed using two thickness materials of metal as indicated. A 0.0118 inch thickness is a standard gauge used in the United States. And, a 0.0127 inch thickness is a custom case and is used specifically for applications outside the United States. All the test materials were aluminum alloys (commonly called 3104H9), and the test materials were adopted from the production raw materials. Cumulative drop height in the table C. D. H represents the average value of 18 tests. The static dome reversal pressure S.I. D. H represents the average value of 10 tests. Internal fluid pressure of each container before dropping I. P is shown in the table for each drop test. The purpose of determining the cumulative drop height is to determine the cumulative drop height at which the dome shaped panel of the canister exhibits partial or total inversion. The procedure is as follows. 1) Warm the product in the container at 90 degrees plus or minus 2 degrees F. 2) In order to achieve a solid container drop, the tube of the drop height tester is installed at 5 degrees from the vertical. 3) Insert the container over the tube, lower it to the 3 inch position, and
Support the container with your fingers. 4) Freely drop the container and tap the steel plate. 5) Continuously repeat the test from the height increased by 3 inches. 6) Touch the dome panel and inspect it for bulges or flips before testing at the next height. 7) Record the height at which the dome inversion occurred. 8) Calculate the cumulative drop height. That is,
Add up the total height of each drop of a given container, including the height at which the inversion occurred. And 9) take the average of the results from the 10 containers.

One beverage maker suggested that the containers delivered to the company have a minimum drop strength of 60 inches. Until now, no container manufacturer has been able to achieve such drop strength. However, the present invention can provide containers with drop strengths that far exceed those of the prior art. Further, the containers produced in accordance with the present invention are capable of meeting cumulative drop height requirements of 20 inches, 30 inches, 40 inches or even 60 inches without increasing material gauge and without increasing cost. is there.

Referring now to Table 1 of FIG. 10, it can be seen that the numbers of columns 3 and 4 exactly match the numbers of columns 1 and 2. The reason for this was that the purpose of the tests in columns 3 and 4 was to harmonize the static dome inversion shown in Figure 2 with varying dome depths. Table 1 of FIG.
2 is the same as the prior art parameter of FIG. 2, so the number of columns 3 and 4 is the same as the number of columns 1 and 2. Test results for the prior art geometries of Table 1 of FIG. 10 and FIG. 2 show metal thicknesses of 0.0118 inches and 0.0127 inches with an internal pressure of 6 per square inch.
At 2.4 lbs and 61.0 lbs, the cumulative drop height was 5.0 inches and 17.5 inches, respectively.
It can be seen that for these two metal thicknesses, static dome reversal pressures were 95.8 and 110.9 pounds per square inch. As shown in Table 1, the radius of curvature of the dome shaped panel is 2.375 inches, which is important to be the prior art radius of curvature of the dome toe ring is 2.120 inches. is there. Now, referring to Table 10 of FIG. 19, comparing with the prior art test results of Table 1, for both metal thicknesses of 0.0118 inch and 0.0127 inch, the dome radius of the container together. R ₄
Is 1.750 inches and the post diameter D ₄ is 1.88.
7 inches, internal pressures of 63.6 PSI (pounds per square inch) and 60.4 PSI, respectively, and the cumulative drop heights of the present invention are 73.5 inches and 137.7, respectively, as shown in columns 1 and 2. It was inches. Static dome reversal pressure is 83.3 PSI and 98.6 P respectively
It turns out that it was SI.

That is, according to the present invention, in the case of a thinner material,
The cumulative drop height was increased by more than 14 times from 5 inches to 73.5 inches and about 8 times from 17.5 inches to 137.7 inches for hot materials. However, FIG.
With reference to Table 1 of FIG. 1 and Table 10 of FIG.
A large reduction of the reversal pressure was achieved. Dome reversal pressure is 95.8 PSI for thin and thick materials in Table 1.
And 110.9 PSI to 83.3 PSI and 98.6 PS for the thin and thick materials of Table 10.
Decreased to I.

The present invention provides a means of eliminating, at least improving, such a reduction in static dome reversal pressure associated with a breakthrough increase in cumulative drop height. Referring now to Table 1 of FIG. 10 and columns 3 and 4 of Table 10 of FIG. 19, the present invention provides cumulative drop heights of 5 inches and 17.5 inches to 70.0 for thin and thick materials. Increased to 13 inches and 136.0 inches. Thus, the present invention increased the cumulative drop height by 14 times for thin materials and almost 8 times for thick materials. At the same time, the difference L ₁ of the inner wall 42 from 0.035 inch to 0.080 inch for thin material,
And by thickening 0.075 inches for thicker material, the container is 91.4 PSI and 106.9 PS.
It had a static dome reversal pressure of I. Therefore, the inner water
Increasing the height L ₁ of the ruler 42 reduces the static dome reversal pressure reduction by 5% for thin materials and 4% for thick materials, while depending on the thickness of the material about 8 times to 14 times. The cumulative drop height increase was achieved up to twice. Referring now to FIG. 9, de - the domed panel 38 various radii of curvature R ₄ and cumulative drop height and static de regard various comparison to the average diameter D ₃ of the annular supporting portion 16 of the radius of curvature R ₄ - Inversion pressure is shown.

In FIG. 9, the height L of the inner wall 42
By increasing ₁ , a tremendous increase in cumulative drop height can be achieved without reducing the static dome reversal pressure below the reversal pressure achieved by the prior art. Also referring now to Table 1 of FIG. 10 and Table 8 of FIG. 17, the prior art static dome reversal pressures of 95.8 and 110.9 of Table 1 are 96.0 and 111.
Static dome reversal pressure of 0 is exceeded and cumulative drop height increase from 5.0 inches to 44.2 inches, and 17.
It can be seen that the size has been increased from 5 inches to 89.1 inches. Thus, in the present invention, a high and significant increase in cumulative drop height can be achieved without a drop in static dome reversal pressure. Furthermore, the inner wall 42
Parameters such as the angle α _{1 and} the height L ₁ of the inner wall
Further improvements can be made by changing the target. The reason is that the test result presented here is the height L
An increase of ₁ increases the static dome reversal pressure,
It is shown that decreasing the angle α ₁ of rule 42 is to increase the static dome reversal pressure.

Referring to Table 11 shown in FIGS. 6 and 20, the test data of Tables 1 to 10 are summarized in Table 11 and the test is performed when the dome height H ₁ is kept constant. The change in results is shown. Then, in FIG. 6, the data of Table 11 is plotted to show the relationship between the cumulative drop height and the radius of curvature R ₄ of the test in which the dome height H ₁ is kept constant at 0.385 inch. There is. In Table 11 of FIG. 20 and Table 12 of FIG. 21, the designation B6A indicates a container made according to the dimensions currently given for the prior art container of the present invention. Other container names (eg X
0133) relates to the experimental drawing numbers of various experimental tools.

Similarly, referring to Table 12 of FIGS. 7 and 21, the test data of Tables 1 to 10 are summarized in Table 12, and the dome height H ₁ is variously changed to 0. .0
96 PSI and 0.0 for 118 inch material thickness
A 127 inch material thickness shows changes in test results when the static dome reversal pressure of 111 PSI is held constant or nearly constant. In FIG. 7, the data in Table 12 of FIG. 21 is plotted to show that the cumulative drop height and static dome reversal pressure are held constant or nearly constant as shown in Table 12. The relationship with the radius of curvature R ₄ is shown.

Referring now to FIG. 8, the static dome reversal pressure for various radii of curvature R _{4 of the} dome shaped panel 38,
Then, it is plotted against various ratios of the radius of curvature R _{4 to} the average diameter D ₃ of the annular support portion 16. In the curve of FIG. 8, the dome height H ₁ , the distance from the pointing surface 18 to the dome-shaped panel 38 along the axis 14, is held constant at 0.385 inches. In summary, the present invention provided results that, even for a person skilled in the art, a reduction in the dome radius R ₄ was not expected to achieve such a significant increase in cumulative drop strength. Furthermore, there was no hint in the prior art that the cumulative drop strength increase was achieved by decreasing the dome radius R ₄ . In addition, it is possible to suppress and eliminate the drop in static dome reversal pressure due to the surprising increase in cumulative drop height. It is also possible to increase the static dome reversal pressure by increasing the height L ₁ of the inner side 42.

Further, for a constant radius of curvature R ₄ of the dome-shaped panel 38, increasing the height L ₁ of the inner wall 42 increases the dome height H ₁ . Therefore, to explain the increase in dome height H ₁ or its limitation is explained in the inner wall 4
To explain the increase or limitation of the height L ₁ of 2. The height L ₁ of the inner wall 42 is increased by the fixed distance L ₂
Is to increase. Therefore, to explain the increase in the fixed position distance L ₂ or its limitation is explained in the inner wall 42.
To explain the increase or limitation of the height L ₁ of the.
Further, the description of the fixed position distance L ₂ is given by the inner convex annular portion 22
Regardless of the size or shape of the inner concave annular portion 44, the shape or inclination of the inner wall 42, or the thickness of the metallic material, the dimensions or restrictions of the present invention are clearly defined.

Finally, the present invention is accomplished by the means and methods described from the various aspects set forth herein.
So far, experiments have been conducted on aluminum containers, but the same principle has been adopted, namely, the radius R ₄ of the dome is reduced, the height L ₁ of the inner wall 42 is increased, the height H ₁ of the dome is increased, and the support is increased. An increase in the home position distance from the surface 18 to the dome shaped panel 38,
And the selection or minimization of the angle α ₁ of the inner wall 42 effectively increases the strength of the container made from other materials, including ferrous and non-ferrous metals, plastics and other non-metallic materials. is there.

[0035]

According to the present invention, the beverage container manufactured by the drawing process and the ioning process is an annular support portion disposed inward from the side wall of the container in a radial direction and coaxially about a vertical axis, It has a dome-shaped or concave panel located inside the annular support, as well as an external connection connecting the annular support to the sidewall. The outer connecting portion has a lower concave annular arcuate portion and an upper convex annular arcuate portion connected to the lower concave annular support portion and the side wall. The annular support portion has an inner and an outer convex annular portion, is preferably arcuate, and is arranged about the same center of curvature. The annular support portion and the inner and outer convex annular portions of the annular support portion provide an annular support surface for supporting the container on a flat, level surface and for resting the container when stacking the containers. The container has an internal connection that connects the dome or concave panel to the annular support. The internal connecting portion extends radially outward from the dome-shaped panel and is curved downwards in the direction of the internal convex annular portion, as well as arranged circumferentially around the vertical axis. And having an inner wall connecting the inner concave annular portion to the inner convex annular portion and locating the dome shaped panel at a stereotactic distance from the annular support surface. By carefully selecting the dimensions of the various parameters and measuring by the cumulative drop height test,
Unexpectedly large increase in container strength. In contrast to the prior art where the reduction of the radius of curvature of the dome-shaped panel is avoided from the reduction of the static dome reversal pressure of the container, in the present invention the curvature of the dome-shaped panel is reduced. When the radius is reduced to a certain range, the static dome reversal pressure drops to a level where the container does not perform satisfactorily. Such a drastic reduction in the radius of curvature of the dome-shaped panel results in a totally unacceptable reduction in static dome reversal pressure while at the same time providing a breakthrough and unexpected increase in drop strength. This increase in drop strength can be as high as 600% or even more. And this astonishing improvement in drop strength is achieved with the same material thickness. While this breakthrough improved drop strength effect is significant, this effect is also combined with a means of eliminating the adverse reduction in static dome reversal pressure associated with the required reduction in the radius of curvature of the dome panel. Without it, it has no commercial value. Static dome reversal pressure can be achieved by carefully choosing various other parameters of the container, such as the localization distance from the supporting surface to the dome-shaped panel and the height of the inner wall of the internal connection. It is possible to eliminate all, or almost all, of the drop in. Furthermore, if an improvement in drop strength of less than 600% is tolerated, by carefully selecting the parameters, one can obtain a good improvement in drop strength while still keeping the container static. It is even possible to increase the target dome reversal pressure. That is, the present invention provides a container having excellent static dome reversal pressure and surprisingly increased drop strength, shrink wrapping and other inexpensive means in place of the ball paper used to package the container. Not only allows the use of
It is possible to use thinner metal raw materials for the container and achieve material cost reductions.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of a lower portion of a beverage container showing details generally common to prior art designs.

2 is a cross-sectional side view of the lower portion of a beverage container, showing details generally common to the preferred embodiment of the present invention. FIG.

FIG. 3 is an enlarged cross-sectional side view showing details generally common to FIGS. 1 and 2.

FIG. 4 is a top view of beverage containers bundled by shrink wrap with a plastic film.

FIG. 5 is a side view of the bundled beverage containers.

FIG. 6 is a graph of the radius of curvature of the dome-shaped panel against cumulative drop height and the ratio of the radius of curvature divided by the average diameter of the annular support portion, wherein the distance from the support surface to the dome-shaped panel is Constant.

FIG. 7 is a graph of a radius of curvature of a dome-shaped panel with respect to a cumulative drop height and a ratio of the radius of curvature divided by an average diameter of an annular support portion. Parameters such as an inner wall height are shown in FIG. It differs from the graph of FIG. 6 in that it is selected to provide a constant static dome reversal pressure.

FIG. 8 is a graph of the radius of curvature for static dome reversal pressure and the ratio of the radius of curvature divided by the average diameter of the annular support portion, the dome height, ie, the dome-shaped panel from the support surface. The distance to is constant.

FIG. 9 is a graph of the radius of curvature of a dome-shaped panel versus static dome reversal pressure and the ratio of the radius of curvature divided by the average diameter of the annular support portion.

FIG. 10 is a table showing test data with different parameters.

FIG. 11 is a table showing test data with different parameters.

FIG. 12 is a table showing test data with different parameters.

FIG. 13 is a table showing test data with different parameters.

FIG. 14 is a table showing test data with different parameters.

FIG. 15 is a table showing test data with different parameters.

FIG. 16 is a table showing test data with different parameters.

FIG. 17 is a table showing test data with different parameters.

FIG. 18 is a table showing test data with different parameters.

FIG. 19 is a table showing test data with different parameters.

FIG. 20 is a table showing test data in which the dome height is constant.

FIG. 21 is a test data in which static dome reversal pressure is constant.
Table showing data.

FIG. 22 is a comparison table of a dome touring radius and a container dome radius.

[Explanation of symbols]

 10 Container 12 Side Wall 14 Vertical Axis 16 Annular Support Part 18 Annular Support Surface 20 External Convex Annular Part 22 Inner Convex Annular Part 28 External Connection Part 38 Concave Panel 40 Internal Connection Part 42 Cylindrical Inner Wall

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Gregory Edwin Robinson 95687 Alamo Drive, Fairfield, CA 9568 # 78 (72) Inventor John M. Wry, Colorado 80302 Boulder Bluff Street 2315-C

Claims (13)

[Claims] 1. A container having enhanced drop strength, a sidewall disposed around a vertical axis, an annular support portion disposed around the vertical axis and having an annular support surface having an arithmetic mean diameter, and the side. An external connection portion interconnecting the wall and the annular support portion, a concave panel disposed inside the annular support portion and having a radius of curvature, and the annular support portion extending inward toward the vertical axis. And a container formed by interconnecting the concave panels to each other, the drop strength is enhanced by selecting the radius of curvature and the arithmetic mean diameter, and the drop strength is the selected curvature. A beverage container characterized in that the radius increases as the ratio to the selected arithmetic mean diameter decreases. 2. The beverage container of claim 1, wherein the drop strength increases as the ratio decreases below 1.05. 3. A container having a desired static dome reversal pressure includes a panel height measured along said axis from said support surface to said recess panel, said panel height being a desired static height. 3. The panel height is selected to provide a high dome reversal pressure, and the panel height increases with decreasing ratio.
Beverage container described in. 4. The ratio of the selected panel height to the selected arithmetic mean diameter increases above 0.2 as the ratio of the selected radius of curvature to the selected arithmetic mean diameter decreases. The beverage container according to claim 3. 5. The ratio of the selected radius of curvature to the selected arithmetic mean diameter decreases by a first angle and the selected panel height increases by a second angle.
The beverage container of claim 3, wherein the first and second angles are selected to provide the drop strength and the static dome reversal pressure. 6. The ratio of the radius of curvature of the selection to the average diameter of the selection is less than 1.05 and the ratio of the panel height of the selection to the arithmetic average diameter is greater than 0.2. The beverage container described in 5. 7. A container having enhanced drop strength, wherein a substantially cylindrical diameter side wall having a diameter and arranged around a vertical axis, and an external connection part interconnecting the annular support part, and the annular support part. Placed inward from
And a container comprising a concave panel having a radius of curvature and an inwardly extending portion that extends inward in the direction of the vertical axis and interconnects the annular support portion and the concave panel, wherein the curvature A beverage container characterized in that the drop strength is enhanced by selecting a radius and the diameter, the drop strength increasing as the ratio of the selected radius of curvature to the selected diameter decreases. 8. The beverage container of claim 7, wherein the drop strength increases as the ratio decreases below 0.8. 9. A container having a desired static dome reversal pressure includes a panel height measured along said axis from said support surface to said recess panel, said panel height being a desired static height. 8. The panel height is selected to provide a high dome reversal pressure, and the panel height increases with decreasing ratio.
Beverage container described in. 10. The ratio of the selected panel height to the selected diameter increases above 0.15 as the ratio of the selected radius of curvature to the selected diameter decreases. Item 9. A beverage container according to item 9. 11. The ratio of the selected radius of curvature to the selected diameter is decreased by a first angle and the selected panel height is increased by a second angle, the first and second 10. The beverage container of claim 9, wherein an angle is selected to provide the drop strength and the static dome reversal pressure. 12. The ratio of the selected radius of curvature to the selected diameter is less than 0.8 and the ratio of the selected panel height to the selected diameter is greater than 0.15. The beverage container according to claim 11. 13. A container having enhanced drop strength and having a desired static dome reversal pressure, wherein an annular support surface is disposed about a vertical axis and an annular support surface is disposed about the vertical axis and has an arithmetic mean diameter. An annular support portion having an outer connection portion that interconnects the sidewall and the annular support portion with each other, an annular connection portion disposed inside the annular support portion and having a radius of curvature, and the concave panel from the support surface. From a concave panel having a panel height measured along the axis up to and an internal connecting portion extending inwardly in the direction of the vertical axis and interconnecting the annular support portion and the concave panel. A structured container,
The radius of curvature and the arithmetic mean diameter are both selected to provide the drop strength, the drop strength increasing as the ratio of the selected radius of curvature to the selected arithmetic mean diameter decreases. A beverage container characterized in that a panel height is selected to provide the static dome reversal pressure, the panel height increasing with a decrease in the ratio.