JPS58134865A - Vessel cover made of metal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metallic container lid, and more particularly to a metallic container lid for a container having a neck portion in which a male thread is formed on the outside surface of the metal container.

According to Shusho, a glass container with a mouth and neck with a male thread formed on the outer circumferential surface is widely used as a container for Western liquors or soft drinks. As a container lid for such a container, a metal container lid having a circular top surface and a cylindrical skirt hanging down from the periphery of the top surface is generally used. Such a container lid is
The above-mentioned male screw # is formed on the mouth and neck when it is attached to the mouth and neck of the container (more specifically, after it is fitted onto the mouth and neck)! (in the case of the so-called roll-on type), or by attaching the male thread formed on the neck of the container before attaching it to the mouth and neck of the container. By forming a corresponding female thread and screwing the female thread into the male thread at the time of mounting (in the case of a press screw type), the container is attached to the mouth and neck of the container. Installed as required.

When opening the neck of the container, the opening operation is performed by placing one's fingers on the skirt and rotating the container lid in the opening direction.

However, in the known metal container lid as described above, when the lid is opened, when the user puts his finger on the skirt and tries to rotate the container in the opening direction, the skirt is cylindrical. There are problems that need to be solved, such as the fact that the container lid may not easily rotate in the opening direction due to slipping of the fingers. In order to prevent fingers from slipping on the skirt, the skirt is generally formed with knurling or uneven portions, but such knurling or uneven portions do not necessarily sufficiently prevent fingers from slipping. I can't.

In order to solve the above-mentioned problems that exist in known metal container lids, it is conceivable to make the skirt not have a cylindrical shape but a regular hexagonal tube or a polygonal tube shape such as a regular hexagonal tube. However, if the entire skirt is formed into a polygonal tube shape, it becomes impossible or extremely difficult to form female threads on the skirt when or before attaching the container to the mouth and neck of the container.

The present invention has been made in view of the above facts, and its main purpose is to eliminate the above-mentioned problems existing in known metal container lids without making it impossible or extremely difficult to form trvs stripes on the skirt. To provide a new and superior metal container tie that solves the problem.

As a result of intensive research, the present author and others have created a skirt with a substantially cylindrical cylindrical part and a substantially polygonal cylindrical part, and formed a #1 thread on the cylindrical part to facilitate opening. By making it possible to put one's fingers on the polygonal cylindrical part in order to rotate the container lid in the opening direction, it is possible to open the container without making it impossible or difficult to form #S threads on the skirt. Therefore, we have found that it is possible to reliably prevent fingers from slipping by rotating the container ★ in the opening direction. In addition, it has been found that if the skirt includes a substantially cylindrical cylindrical portion and a substantially polygonal cylindrical portion, the container track can be made to have a new and attractive appearance.

That is, according to the present invention, there is provided a metal container comprising a top surface and a cylindrical skirt that hangs down from the periphery of the top surface, for a container having a neck portion with a male thread formed on the outer peripheral surface. to 2
the cylindrical skirt includes a polygonal cylindrical portion having a substantially polygonal cylindrical shape and a cylindrical portion having a substantially cylindrical shape; A quantity of the metal container is provided as a percentage of the formation of a male thread corresponding to the thread a.

Hereinafter, reference will be made to the accompanying drawings illustrating a practical example of a metal container constructed in accordance with the present invention. 4-m
Explain.

Referring to FIG. 1 illustrating a first embodiment of a metal container constructed in accordance with the present invention, the container may be made of any suitable metal such as aluminum-based alloy sheet, chromic acid treated steel sheet or tin plate. The container lid that can be formed, generally indicated by the number 2, comprises a top surface 4 and a cylindrical skirt 6 depending from the periphery of the top surface 40.

As clearly shown in FIG. 2, the top surface 4 in the illustrated embodiment has a substantially polygonal shape, preferably a regular octagonal shape or a regular polygonal shape such as a regular octagonal shape, and in the illustrated case, each corner is flattened. (or rounded) fic substantially in the shape of a regular octagon. On the other hand, the cylindrical skirt 6 in the illustrated example has a polygonal cylindrical portion 8 located at the top of the cylindrical skirt 6 following the top surface 4.
and a cylindrical portion lO located below the polygonal cylindrical portion 8. The polygonal tube s8 of the cylindrical skirt 6 is the third
As is clear from the figure, it has a substantially polygonal cylinder shape, preferably a regular hexagonal cylinder shape or a regular polygonal shape such as a regular hexagonal cylinder shape, and in the case shown, a substantially regular polygonal shape with each corner being flattened (or rounded). Hexagonal cylinder shape, soaring. The polygonal tube shape of both polygonal portions 8 of the cylindrical skirt 6 and the polygonal shape of the top surface 4 correspond to each other, although this is not necessarily the case. 8 has a substantially regular hexagonal cylindrical shape, the top surface 4 also has a substantially regular hexagonal shape, and the corners of the polygonal cylindrical portion 8 and the corners of the top surface 4 are mutually opposite to each other. Conveniently, it is located in alignment with.

As is clear from FIG. 4, the cylindrical portion 10Fi of the cylindrical skirt 6 has a substantially cylindrical shape.

As clearly shown in FIG. 1, an annular recess 12 is formed at the boundary between the polygonal cylindrical portion 8 and the cylindrical portion 10 of the cylindrical skirt 6. It is advantageous to have the function of guiding and positioning the forming roller when forming the male thread in the lO.

In the illustrated embodiment, the cylindrical skirt 60 has an annular line of weakness 14 in the cylindrical portion lO, as clearly shown in FIG.
is formed, and the cylinder s10 is an annular weakened line 14
↓Thread forming area 16 located at the top of 4 and pilfer proof area 1 located below the annular weakening fin 14
It is divided into 8. The annular weakening line 14 can be formed by a so-called score formed by reducing the thickness of the material, but as shown in the figure, it can be formed by a plurality of slits (kerfs) extending in the circumferential direction at intervals of t. )2
0 and a bridging portion 22 located between the slits 20.

Furthermore, in the specific example shown, as clearly shown in FIG. 1, the inner surface of the top surface 4 is provided with a sealing member 24 of an appropriate form that is engaged with the edge of the mouth and neck of the container as will be described later. is installed.

Seal member 24, which is conveniently formed from any suitable synthetic resin material, such as polyethylene or vinyl chloride resin.
For example, by supplying a synthetic resin material in a softened and molten state to the inner surface of the top WJ4 and then molding this synthetic resin material into the shape of a violet, or by supplying a synthetic resin material in a softened and molten state to the top surface. It can also be formed directly on the inner surface of the top surface 4 by pouring it into an appropriate shape such as an annular shape on the inner surface of the top surface 4 and then performing a foaming treatment. Alternatively, the synthetic resin material can be formed into a suitable shape separately. It can also be formed by molding the synthetic resin material and then positioning the formed synthetic resin material on the inner surface of the ceiling 14.

The container lid 2 as described above is applied to a container having a neck portion generally shown at 26 in FIG. The neck portion 26 of the container, which may be made of glass, has a thread 28 and an annular locking surface 30 formed on its outer peripheral surface. The annular locking surface 30 is formed below the male thread 28 and faces downward in the axial direction.

In order to seal the mouth and neck part 26 by attaching the container lid 2 to the mouth and neck part 26' of the container, as shown in FIG. Press downward in the @ line direction to bring the sealing member 24 into optically tight engagement with the edge of the opening part 26. Then, while maintaining this state, a thread is formed on the outer circumferential surface of the neck portion 26 in the thread forming region 16 of the cylindrical portion 10 of the cylindrical skirt 6 using an appropriate forming roller (not shown) which is known per se. male screw 2
A female thread 32 is formed along the line 8. When forming this female IIK strip, a forming roller (not shown) is initially positioned in the annular recess 12 formed at the boundary between the polygonal cylindrical portion 8 of the cylindrical skirt 6 and the circle wJs10. From the annular recess 12! The thread forming area 16 of the cylindrical portion 10 is moved spirally downward along the m thread 28, and a female thread extends spirally downward from the annular recess 12 along the male thread 28. 32 is formed. Container lid 2 on mouth and neck 26
When installing the pilfer-proof area 18 in the cylindrical part 10 of the cylindrical skirt 6, the pilfer-proof area 18 in the cylindrical part 10 of the cylindrical skirt 6 is fitted by means of a suitable molding known per se, row 17 (not shown).
The lower end is deformed radially inward and engaged with an annular locking surface 30 formed on the outer peripheral surface of the mouth and neck portion 26.

On the other hand, in the above-described container container 2 constructed according to the present invention, the cylindrical skirt 6 includes the cylindrical portion 10 as well as the polygonal cylindrical portion 8; The threads 32 are formed in the threaded region 16 of the cylindrical portion 10 and are also deformed radially inward to form the rock-like locking surface 30.
The part that is locked to the cylindrical part 10, specifically the lower end of the pilfer-proof area 18 of the cylindrical part 10, is formed by forming the female thread 32 and locking it to the annular locking surface 30.
It can be easily accomplished in the same way as known container closures.

Container lid 2t1 attached to mouth part 26 as described above
When opening the neck part 26 by separating it from the neck part 26, put your finger on the long part 8 of the cylindrical skirt 6 and press the container lid 2.
is rotated in one direction, that is, counterclockwise when viewed from above in FIG. In this way, since the #thread 32 formed in the thread forming area 16 of the cylindrical portion 10 is moved along the male thread 28 formed on the outer circumferential surface of the bottom portion 26, the eight container lids 2 also tries to move upward in the axial direction.

However, the Billfer proof area 1 of the cylindrical part 10
The lower end of the mouth and neck part 8 is locked to an annular locking surface 30 formed on the outer peripheral surface of the mouth and neck part 26, so that downward movement in the axial direction is prevented.

In this way, a considerable stress acts on the annular weakened line 14 formed in the cylindrical portion 10, which causes the annular weakened line 14 (its A-line portion 22) to break, and the container 2 to move upward from the annular weakened line 14. part (top 4, polygonal tube s8
and a thread forming region 16) of the cylindrical portion 1o and a portion below the annular feathering 2-in 14 (pilfer-proof region 18 of the cylindrical portion 10). After that, the portion of the container lid 2 above the annular emergence line 14 can be moved upward in the axial direction, so that the container lid 2
In response to the rotation, the seal moves upward in the axial direction and is detached from the mouth and neck part 26, thereby opening the mouth and neck part 26. On the other hand, a portion of the container lid 2 below the annular emergence line 14,
That is, the pilfer-proof region 18 of the cylindrical portion 10
It remains there without being removed from part A 26.

Thus, a container as described above constructed according to the present invention*
2, the cylindrical skirt 6 has a cylinder 5510 and a polygon 1! There is also an Ils&, which can be rotated when opening, so the opening operation can be carried out by rotating the container in the opening direction without causing slippage on the fingers. .

Furthermore, as can be easily understood from FIGS. 1 and 5, the above-mentioned container lid 2 constructed according to the present invention, in which the cylindrical skirt 6 includes the cylindrical portion 1o and the polygonal cylindrical portion 8,
It has a novel and attractive appearance.

Thus, in the container lid 2 shown in FIGS. 1 to 5, when opening the neck portion 26i, the Fi cubic weakening line 1
4. The part of the container lid 2 that is completely broken above the annular emergence line 14 and the part below the annular emergence line 14,
That is, it is completely separated from the pilfer-proof region 18 of the cylindrical portion 1o, and therefore the portion of the container iM2 above the annular emergence line 14 is separated from the mouth and neck portion 26, but
Pilfer-proof region 18 is configured to remain in mouth and neck region 26 . However, the present invention is not limited to container lids of this type, but can also be applied to bilfer-proof type or non-pilfer-proof type container lids.

For example, one or more weakened lines (such weakened lines/are called perforations or material thickness In addition to forming a so-called score that is reduced, at least a part of the bridging portion in the annular weakened line is made strong, and the mouth and neck area 1:I1 is made stronger.
1. When sealing, at least one of the axial weakening lines formed in the pilfer-proof region is broken to open the pilfer-proof region from an annular shape to a band shape, while the annular weakening line is not completely broken. Therefore, the pilfer-proof region is not completely separated from the part above the annular emergence line, but remains partially connected to it.
The present invention also relates to a container configured such that Vc is maintained, and thus the entire container lid including the pilfer-proof area can be removed from the mouth area without the pilfer-proof area remaining in the mouth and neck area. can be applied.

In addition, a relatively large number of weakened lines extending in the axial direction (such fracture lines may be so-called perforations or so-called scores that reduce the thickness of the material) are formed in the pilfer-proof region L, and the opening th During sealing, the annular eclosion line remains unbroken, the axial breakable line is broken to divide the birfer-proof area into a plurality of arcuate parts, and the divided plurality By displacing each of the arcuate parts outward in the radial direction, each of the arcuate parts formed on the outer circumferential surface of the mouth and neck part is separated from the fractured annular surface, and thus the pilfer-proof area is also prevented from extending to the mouth and neck part. The present invention can also be applied to a container lid configured such that the entire container lid including the proof area can be removed from the mouth and neck.

Furthermore, the present invention provides a non-pilfer material in which an annular weakening line is not formed in the cylindrical portion and the lower end of the cylindrical portion is not deformed inward in the radial direction when the container healing device is attached to the mouth and neck. It can also be used for container lids made of proof rind.

In the specific example mentioned above, the mouth and neck! When attaching the container lid 2t to the container lid 2t, the cylindrical portion 10 of the cylindrical skirt 6 (more specifically, the sJA square acid forming region 16 of the cylindrical portion 10 is formed with a thread 32?c, Before attaching the lid, a female thread is formed on the cylindrical part of the cylindrical skirt, and when the container lid is attached to the mouth part, the container lid is rotated in the closing direction with respect to the mouth neck part and the female thread is formed. The FJ# of the present invention can also be applied to a so-called press clean type container lid that is screwed onto a male thread formed on the outer peripheral surface of the mouth and neck.

Furthermore, the present invention can also be applied to a container lid, generally referred to as a stell cap, in which the cylindrical skirt has an elongated portion that extends further downward following the Tm of the pilfer-proof region.

FIG. 6 illustrates a specific example in which the present invention is applied to a container lid generally called a steal cap. To explain this with reference to FIG. 6, the container lid shown in the figure, indicated by the overall number 102, which can be formed from a suitable metal plate, has a top surface 104 and a flexible structure that hangs down from the periphery of the large curve 104. It has a long cylindrical skirt lo6. The top surface 104 is substantially polygonal, and in the case shown, each corner is flattened (or rounded)
It has a sharp hexagonal shape. A seal member 124 of an appropriate form is disposed on the inner surface of the top surface 104.

The cylindrical skirt 106 includes a polygonal cylindrical portion 108 located above the cylindrical skirt 106 following the top surface 104, and a cylinder 5110 located below the polygonal cylindrical portion 108. The polygonal cylinder part 108 is substantially the same as the polygonal cylinder s8 in the first specific example shown in FIGS. 1 to 5, and has a substantially polygonal cylinder shape, preferably a regular hexagonal cylinder shape or a regular hexagonal cylinder shape σ. In the illustrated case, each corner is rounded (or rounded) to correspond to the top surface 104, so that it is actually substantially in the shape of a regular square cylinder. The cylindrical portion 110 of the cylindrical skirt 106 has a substantially cylindrical shape, similar to the cylindrical portion IO in the first specific example. An annular recess 11 is provided at the boundary between the polygonal cylindrical portion 108 and the cylindrical portion 110 of the cylindrical skirt 106.
The annular recess 112 (corresponding to the circular recess 112 in the first specific example) is formed.

Therefore, in the second specific example shown in FIG. 6, the cylindrical portion 110 is formed with a loam-like weakening line 114, and the cylindrical portion 110 is annularly weakened. #Striped bottom area 1 located above line 114
16 and a pilfer-proof region 118 located below the annular weakened line 114.
In the second embodiment illustrated in the figures, the barrel 5110 has a fascia 134 that extends downwardly following the lower end of the pilfer-proof region 116. In the second specific example illustrated in FIG.
An annular protrusion 136 is formed on 18.

The second specific example shown in FIG. 6 is shown in FIG. 7 as a whole, and has a mouth and neck shaped as shown at 126, a female thread 128 on the outer peripheral surface, and a position below the pheasant ring 128. It is commonly used for containers having a neck portion having a lug-like catch 130 that is axially directed downward.

Container in the oral part 126 of the container! 102 with iron layer and mouth and neck 1
26, as shown in FIG. 7, the container ti 102 is fitted onto the neck 126, and the container ti 102 is pressed downward in the axial direction to seal the sealing member 124t - the neck 1.
26 is engaged with the optical splitter. Then, while maintaining this state, a cylindrical scarr) 1060 is formed by a suitable forming roller (not shown) which is known per se.
A male thread 132 is formed in the thread forming region 116 in the circular m portion 110 along the male thread 128 formed on the outer peripheral surface of the mouth and neck portion 126. Furthermore, the lower end of the pilfer-proof region 118 in the cylinder @ 110 of the cylindrical skirt 106 or the upper end of the extension 134, in other words the pilfer-proof region 118 and the boundary S between the extension part 134
is locked to an annular locking surface 130 that deforms radially inward.

Container lid 10 attached to mouth and neck 126 as described above
2 from the mouth and neck part 126 to remove the mouth and neck part 126t-
To open and return the container, as in the case of the first specific example, place your finger on the polygonal cylindrical portion 108 of the cylindrical scarf 106 and press the container lid 102 in the opening direction, that is, when viewed from above in FIG. Rotate the hour hand counterclockwise. In this way, as in the case of the specific example of the butterbur, the annular weakened line 114 is broken, and the container lid 102 is broken in the portion above the annular weakened 2-in 114 (the top surface 104, the polygonal cylindrical portion 108, and the cylindrical portion). 110
(the thread forming region 116) and the portion below the annular forming line 114 (the pilfer-proof region 1 of the cylindrical portion 110).
18 and an extension 134). The portion below the annular weakened line 1.14 remains in the mouth portion 126, but the portion above the annular weakened line 114 is separated from the mouth and neck portion 126, and thus the mouth and neck portion 12
6 is opened.

FIG. 8 shows a modification of the second specific example shown in FIGS. 6 and 7. In FIG. Container lid 2 illustrated in FIG.
02, the extension 234 that extends further downward following the lower end of the pilfer-proof region 218 is not substantially cylindrical in shape but is substantially polygonal cylindrical in shape. Extension part 23
Although the polygonal shape at 44 is not necessarily a public expense, the polygonal tube 5208 located at the top of the cylindrical skirt 206
If the polygonal tube fm08 has a substantially regular hexagonal tube shape, the extension portion 234 also has a substantially regular hexagonal tube shape correspondingly, and the polygonal tube fm08 corresponds to the polygonal tube shape in the polygonal tube portion 20.
The corner of 8 and the corner of the extension 234 are aligned with each other and positioned 1
It is convenient to have 1 ze.

The container @ 202 shown in FIG. 8 is applied to a container having a neck part 126 in the form shown in FIG.
A male thread is formed in the thread forming region 216 of the pilfer-proof region 216, and the lower end of the pilfer-proof region 218 is also deformed radially inward to be secured to the annular locking surface 130 formed on the outer peripheral surface of the neck portion 126. be stopped. Other than the above-mentioned points, the structure and operation of the container fi 202 shown in FIG. 8 are the same as the container lid 102 shown in FIGS. 6 and 7.

FIG. 9 shows the amount of the present invention 1 in a non-pilfer-proof container.
A concrete example of the application is illustrated. Referring to FIG. 9 (gold), the illustrated container quantity indicated by the number 302 in the whole 1 which can be formed from a suitable metal area plate includes a top surface 304 and a cylindrical skirt hanging from the periphery of the top surface 304. 306
and has. The top surface 304 has a substantially circular shape. Top surface 3
A sealing member 324 of an appropriate form is disposed on the inner surface of 04. On the other hand, the cylindrical skirt 306 is the top! 03
04 Next, there is a cylindrical portion 310 located above the cylindrical skirt 306, and a polygonal cylindrical portion 308 located below the cylindrical portion 310. The cylindrical portion 310 of the cylindrical skirt 306 has a substantially cylindrical shape and has an annular recess 312 formed in its upper portion. The polygonal cylindrical portion ν08 of the cylindrical skirt 306 has a substantially polygonal cylindrical shape, preferably a regular polygonal shape such as a regular hexagonal shape or a regular octagonal shape, and in the illustrated case, each corner is flattened (or rounded). It has a substantially regular hexagonal cylinder shape.

The container lid 302 shown in FIG. 9 is applied to a container having a □-shaped neck and neck, as shown generally by numeral 326 in FIG. A male thread 328 is formed on the outer peripheral surface of the mouth and neck portion 326 .

The container lid 302 is attached to the mouth and neck part 326 of the container, and the mouth and neck part 3
26, as shown in FIG.
The light beam is tightly aligned with the edge of the Then, while maintaining this state, an appropriate forming roller (
(not shown), a female thread 332 is formed in the cylinder @310 of the cylindrical skirt 306 along the male thread 328 formed on the outer peripheral surface of the mouth portion 326. When forming this female thread, a forming roller (not shown) is initially positioned in an annular recess 312 formed in the upper part of the cylindrical portion 310, and from this annular recess 312 a male thread 3 is formed.
Therefore, a female thread 332 is formed in the cylindrical portion 310, extending downward from the annular recess 312 in a spiral pattern along the male thread i28.

Rong Yi Gong 30 attached to the mouth and neck region 326 as described above
2 (j, when separating from the neck part 326 and unsealing the neck part 326, the polygonal cylinder part 308 of the cylindrical skirt 306
Put your finger on the container lid 3021 and turn it *-V in the opening direction, that is, counterclockwise when viewed from above in FIG.

Although several specific examples of container lids constructed according to the invention have been described above in detail with reference to the drawings, the invention is not limited to such specific examples, and does not fall within the scope of the present invention. Needless to say, various modifications and modifications are possible without deviation.

[Brief explanation of the drawing]

FIG. 1 is a side view, partially in section, of a first specific example of a container lid constructed according to the present invention. FIG. 2 is a plan view of the container lid shown in FIG. 1. FIG. 3 is a sectional view taken along the line ■--■ in FIG. 1. @Figure 4 is a sectional view taken along line IV-IV in Figure 81. FIG. 5 is a side view partially shown in the trr plane, showing a state in which the container amount shown in FIG. 1 is attached to the mouth part of the container. FIG. 6 is a sea bream view, partially in cross section, of a second specific example of the +V bell fly constructed according to the present invention. FIG. 7 is a partially sectional view showing a state in which the container lid shown in FIG. 6 is attached to the mouth and neck of the container. FIG. 8 is a side view, partially in cross section, of a third specific example of a container constructed according to the present invention. FIG. 9 shows the W
@ side view showing a part of a specific example of J4 in cross section. The 10th opening is a partially cross-sectional view of the container ¥i shown in FIG. 9 with the container ¥i attached to the mouth and neck of the container II! First page view. 2.102.202, and 302...Container
Quantity 4.104.204 and 304...Top surface 6.106X206 and 306...Strawberry skirt 8.10&, 208 and 308...Polygonal cylinder part 10.110. 210 and 310...Cylinder
Department Patent Applicant: Japan Crown Cork Co., Ltd. Figure 2

Claims (1)

[Claims] 1. A container made of gold IF4, comprising a top surface and a cylindrical skirt hanging down from the periphery of the top surface, for a container having a neck portion with a male thread formed on the outer peripheral surface. In the lid; the cylindrical skirt includes a polygonal cylindrical portion having a substantially polygonal cylindrical shape and a circular cylindrical portion having a substantially cylindrical shape; A metal container lid characterized in that a male thread corresponding to the male thread is formed on the front thereof. 2. The top surface has a substantially polygonal shape corresponding to the polygonal tube, the polygonal tube is located at the upper part of the cylindrical skirt following the hexagonal surface, and the inner tube has a substantially polygonal shape corresponding to the polygonal tube. 2. A metal container lid according to claim 1, which is located below said portion. 3. The metal container lid according to claim 2, wherein an annular recess is formed at the boundary between the polygonal tube portion and the cylindrical portion. 4. An annular weakened twin is formed in the cylindrical portion, and the cylindrical portion has a thread forming region located above the annular weakened line and a pilfer-proof region located below the annular weakened line. When the feeding amount is attached to the mouth and neck, the male thread is formed in the thread forming area, and the lower end of the pilfer-proof area 1j is radially inward. The metal container according to claim 3, which is deformed and is locked to a broken surface formed below the male thread on the outer circumferential surface of the neck and facing downward in the M-line direction. lid. 5. The cylindrical skirt has a length extending downwardly following the lower end of the pilfer-proof region. F
A metal container lid according to claim 4. 6. The metal container lid according to claim 5, wherein the extension portion has a substantially cylindrical shape. 7. The metal container lid according to claim 5, wherein the extension portion has a substantially polygonal cylinder shape. 8. The top surface has a substantially circular shape corresponding to the cylindrical portion,
The metal container lid according to claim 1, wherein the cylindrical part is located at the upper part of the cylindrical skirt following the top surface, and the polygonal cylindrical part is located below the cylindrical part. . 9. The metal container lid according to any one of items 1 to 8, wherein the polygonal cylinder portion has a substantially regular polygonal cylinder shape.