JP6989406B2 - Metal bottle - Google Patents

Metal bottle Download PDF

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JP6989406B2
JP6989406B2 JP2018023901A JP2018023901A JP6989406B2 JP 6989406 B2 JP6989406 B2 JP 6989406B2 JP 2018023901 A JP2018023901 A JP 2018023901A JP 2018023901 A JP2018023901 A JP 2018023901A JP 6989406 B2 JP6989406 B2 JP 6989406B2
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thread
bottle
cap
height
stage
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JP2018103265A (en
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武志 藍原
政臣 田村
俊幸 長谷川
健 村瀬
友彦 中村
尚也 松本
信宏 篠島
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Toyo Seikan Kaisha Ltd
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Description

本発明は、ねじ部を有する金属製ボトルに関するものである。 The present invention relates to a metal bottle having a threaded portion.

金属製ボトルは、有底筒状のボトル本体の上部に口金部を有し、その口金部にねじ式の金属製キャップを被着するものが、飲料製品などのキャップ付き容器として普及している。このような金属製ボトルは、ボトル本体を絞り加工、絞り−しごき加工等を施して有底筒状に形成し、上部を一端縮径して口金部を形成し、この口金部にねじ成形装置によってねじ部を形成している。 Metal bottles have a cap on the top of the bottomed tubular bottle body, and a screw-type metal cap is attached to the cap, which is widely used as a container with a cap for beverage products and the like. .. In such a metal bottle, the bottle body is drawn, drawn-ironed, etc. to form a bottomed cylinder, and the upper portion is reduced in diameter at one end to form a base portion, and a screw forming device is formed on the base portion. The threaded portion is formed by.

この際に用いられるねじ成形装置は、口金部の内周面に当接する中子と、口金部の外周面に当接する外子によって、口金部の外周に山部と谷部を有するねじ部を形成する。また、このような金属製ボトルにおける口金部の先端部には、カール成形装置によって、先端を外側に折り返したカール部が形成されている。 The thread forming apparatus used at this time uses a core that abuts on the inner peripheral surface of the mouthpiece and an outer element that abuts on the outer peripheral surface of the mouthpiece to form a threaded portion having ridges and valleys on the outer periphery of the mouthpiece. Form. Further, at the tip of the base portion of such a metal bottle, a curl portion whose tip is folded outward is formed by a curl molding apparatus.

このような従来の金属製ボトルは、口金部にねじ部を形成した後にカール部などを形成する後加工を行うため、後加工による軸方向圧縮荷重により、後加工後にカール部に近い一段目のねじ山の頂部が他のねじ山の頂部より外側に突出する変形を起こし、キャップの開閉を円滑に行うことができなくなる問題があり、これに対する回避案が提案されている。例えば、下記特許文献１の従来技術では、ねじ部の一段目のねじ山（カール部に近いねじ山）の高さを、所定の角度範囲で他段目のねじ山の高さより低く形成し、口金部の先端にカール部を形成した後に、ねじ部の一段目のねじ山の高さと他段目のねじ山の高さが略同等になるようにしている。 In such a conventional metal bottle, since the post-processing for forming the curl portion and the like is performed after forming the threaded portion on the base portion, the first stage close to the curl portion after the post-machining due to the axial compression load due to the post-processing. There is a problem that the top of the thread is deformed so as to protrude outward from the tops of other threads, and the cap cannot be opened and closed smoothly, and a workaround for this has been proposed. For example, in the prior art of Patent Document 1 below, the height of the thread of the first step of the threaded portion (the thread near the curled portion) is formed to be lower than the height of the thread of the other step in a predetermined angle range. After forming the curl portion at the tip of the base portion, the height of the thread of the first step of the threaded portion and the height of the thread of the other step are made to be substantially equal to each other.

特開２００８−８７０７１号公報Japanese Unexamined Patent Publication No. 2008-87071

前述した従来技術によると、金属製ボトルのねじ部の形成時には、一段目のねじ山の高さを低く形成しておき、後加工でカール部を成形する際の変形によって、ねじ部の一段目のねじ山の高さと他段目のねじ山の高さを略同等の高さとしている。
そして、このような金属製ボトルに内容物を充填後、金属製キャップ（ねじ加工前のカップ状キャップ）を金属製ボトルの口金部に被せ、ねじ加工ロールでキャップを口金部のねじ部の形状に応じた形状にキャッピング加工して被着、密封される。 According to the above-mentioned conventional technique, when forming the threaded portion of the metal bottle, the height of the threaded portion of the first step is formed low, and the first step of the threaded portion is caused by the deformation when the curl portion is formed in the post-processing. The height of the thread of No. 1 and the height of the thread of the other stage are almost the same height.
Then, after filling such a metal bottle with the contents, a metal cap (a cup-shaped cap before screw processing) is put on the base portion of the metal bottle, and the cap is placed on the base portion of the base portion with a screw processing roll. It is capped to a shape according to the above, adhered, and sealed.

このように、キャップが金属製ボトルの口金部のねじ部の形状に応じた形状に被着されるが、キャップ付き容器として、ねじ式のキャップの円滑な開閉を保ちつつ、内容物のレトルト殺菌時や炭酸飲料充填時などの内圧が高くなる場合のねじ部によるキャップの密封性（保持力）、キャッピング加工のしやすさ、キャップ再栓の操作性の向上、落下衝撃耐性の向上などがより一層望まれている。 In this way, the cap is attached to the shape corresponding to the shape of the threaded part of the base of the metal bottle, but as a container with a cap, the contents are sterilized by retort while maintaining the smooth opening and closing of the screw type cap. The sealing performance (holding power) of the cap by the threaded part when the internal pressure becomes high, such as when filling with carbonated drinks, the ease of capping, the operability of re-plugging the cap, and the improvement of drop impact resistance are improved. More desired.

本発明は、このような問題に対処するために提案されたものである。すなわち、口金部にねじ部を有する金属製ボトルにおいて、ねじ式のキャップの円滑な開閉を保ちつつ、ボトルの内圧が高くなる場合にねじ部によるキャップの密封が確実に行われ、キャッピング加工のしやすさ、キャップ再栓の操作性の向上、落下衝撃耐性の向上などが可能な金属製ボトルを得ること、などが本発明の課題である。 The present invention has been proposed to address such problems. That is, in a metal bottle having a threaded portion on the base, the cap is reliably sealed by the threaded portion when the internal pressure of the bottle is high while maintaining the smooth opening and closing of the threaded cap, and the capping process is performed. It is an object of the present invention to obtain a metal bottle capable of improving ease of use, operability of re-plugging a cap, improvement of drop impact resistance, and the like.

このような課題を解決するために、本発明は、以下の構成を具備するものである。 In order to solve such a problem, the present invention has the following configurations.

有底筒状のボトル本体の上部に口金部を有し、該口金部にねじ部を有すると共に、前記口金部の先端にカール部を有する金属製ボトルであって、完全ねじ部における、前記ねじ部の底部を連ねた直線と先端側から一段目のねじ山の頂部との距離であるねじ山の高さが、前記直線と先端側から二段目のねじ山の頂部との距離であるねじ山の高さより高く、前記一段目のねじ山の頂部とボトル軸との距離と、前記二段目のねじ山の頂部と前記ボトル軸との距離が略等しいことを特徴とする金属製ボトル。 A metal bottle having a cap portion at the upper part of a bottomed tubular bottle body, a thread portion at the cap portion, and a curl portion at the tip of the cap portion, and the screw in the completely threaded portion. The height of the thread, which is the distance between the straight line connecting the bottoms of the portions and the top of the first thread from the tip side , is the distance between the straight line and the top of the second thread from the tip side. A metal bottle that is higher than the height of the mountain and is characterized in that the distance between the top of the first-stage screw thread and the bottle shaft is substantially equal to the distance between the top of the second-stage screw thread and the bottle shaft.

本発明の金属製ボトルによれば、ねじ式のキャップの円滑な開閉を保ちつつ、ボトルの内圧が高くなる場合にねじ部によるキャップの密封が確実に行われ、キャッピング加工のしやすさ、キャップ再栓の操作性の向上、落下衝撃耐性の向上などが可能な金属製ボトルを容易に得ることができる。 According to the metal bottle of the present invention, the cap is surely sealed by the threaded portion when the internal pressure of the bottle is high while maintaining the smooth opening and closing of the screw type cap, and the cap is easy to cap. It is possible to easily obtain a metal bottle capable of improving the operability of re-plugging and improving the resistance to drop impact.

本発明の実施形態に係る金属製ボトルの全体構成を示した説明図である。It is explanatory drawing which showed the whole structure of the metal bottle which concerns on embodiment of this invention. 本発明の実施形態に係る金属製ボトルの口金部にねじ部を形成した状態を示した説明図（部分断面図）である。It is explanatory drawing (partial sectional view) which showed the state which the screw part was formed in the base part of the metal bottle which concerns on embodiment of this invention. 本発明の実施形態に係る金属製ボトルの口金部にねじ部を形成した後にカール部を形成した状態を示した説明図（部分断面図）である。It is explanatory drawing (partial sectional view) which showed the state which formed the curl part after forming the screw part in the base part of the metal bottle which concerns on embodiment of this invention. 本発明の他の実施形態を示した説明図である（（ａ）が口金部にねじ部を形成してカール部を形成する前の状態、（ｂ）が口金部にねじ部を形成した後にカール部を形成した状態を示している。）。It is explanatory drawing which showed the other embodiment of this invention ((a) is the state before forming the thread part in the mouthpiece part, and formed the curl part, (b) is after forming the thread part in the mouthpiece part. The state in which the curled portion is formed is shown.).

以下、図面を参照して本発明の実施形態を説明する。以下の説明で異なる図における同一符号は同一機能の部位を示しており、各図における重複説明は適宜省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different figures indicate parts having the same function, and duplicate description in each figure will be omitted as appropriate.

図１に示すように、金属製ボトル１は、ボトル本体１Ａの上部にボトル軸Ｏと同軸の口金部２を有している。そして、口金部２には、ねじ部３が形成され、また、口金部２の先端にはカール部４が形成されている。口金部２におけるねじ部３とカール部４の形成は、前述したように、ねじ成形装置とカール成形装置が用いられる。 As shown in FIG. 1, the metal bottle 1 has a base portion 2 coaxial with the bottle shaft O at the upper part of the bottle body 1A. A screw portion 3 is formed in the base portion 2, and a curl portion 4 is formed at the tip of the base portion 2. As described above, a screw forming apparatus and a curl forming apparatus are used to form the screw portion 3 and the curl portion 4 in the base portion 2.

ねじ成形装置は、口金部２の内周面に中子を当接し、口金部２の外周面に外子を当接することで、口金部２の外周にねじ部３を形成する。カール成形装置は、口金部２にねじ部３を形成した後に、口金部２の先端にカール形状の型を押し当てて、口金部２の先端を外側に折り返してカール部４を形成する。 The screw forming apparatus abuts the core on the inner peripheral surface of the mouthpiece 2 and abuts the outer element on the outer peripheral surface of the mouthpiece 2 to form the threaded portion 3 on the outer periphery of the mouthpiece 2. After forming the screw portion 3 on the base portion 2, the curl forming apparatus presses a curl-shaped mold against the tip of the base portion 2 and folds the tip of the base portion 2 outward to form the curl portion 4.

金属製ボトル１の口金部２には、キャップ５が被着される。キャップ５は、例えば、キャップ本体５Ａの下部に、スコア部５Ｂとブリッジ部５Ｃとリング部５Ｄを有している。キャップ５は、金属製ボトル１内に内容物を充填した後に被着され、図示省略のキャッピング装置によって、口金部２に設けたねじ部３に沿ってキャップ本体５Ａにねじ加工が施され、リング部５Ｄがねじ部３の下側にかしめ加工されるアルミニウム等の金属板から成る金属製キャップである。 A cap 5 is attached to the base portion 2 of the metal bottle 1. The cap 5 has, for example, a score portion 5B, a bridge portion 5C, and a ring portion 5D in the lower part of the cap body 5A. The cap 5 is attached after filling the metal bottle 1 with the contents, and the cap body 5A is threaded along the threaded portion 3 provided in the base portion 2 by a capping device (not shown) to form a ring. A metal cap made of a metal plate such as aluminum whose portion 5D is caulked under the threaded portion 3.

図２は、金属製ボトル１の口金部２におけるねじ部３の形成状態を示している。ねじ部３は、図示の断面において、先端側から一段目のねじ山３Ａと二段目のねじ山３Ｂが少なくとも形成されている。一段目のねじ山３Ａと二段目のねじ山３Ｂは、それぞれ、外側に突出した頂部３０と内側に突出した底部３１を備えている。 FIG. 2 shows the formation state of the screw portion 3 in the base portion 2 of the metal bottle 1. In the cross section shown in the figure, the threaded portion 3 has at least a first-step thread 3A and a second-step thread 3B formed from the tip side. The first-stage thread 3A and the second-stage thread 3B each have an outwardly projecting top 30 and an inwardly projecting bottom 31, respectively.

そして、金属製ボトル１の口金部２においては、後述するねじ部３の完全ねじ部における一段目のねじ山３Ａの高さＴ１と、二段目のねじ山３Ｂの高さＴ２が略等しく、一段目のねじ山３Ａの頂部３０とボトル軸Ｏとの距離Ｒ１が、二段目のねじ山３Ｂの頂部３０とボトル軸Ｏとの距離Ｒ２より小さく（Ｒ１＜Ｒ２）形成されている。 In the base portion 2 of the metal bottle 1, the height T1 of the first-stage thread 3A and the height T2 of the second-stage thread 3B in the completely threaded portion of the thread portion 3 described later are substantially equal. The distance R1 between the top 30 of the first-stage screw thread 3A and the bottle shaft O is formed to be smaller than the distance R2 between the top 30 of the second-stage screw thread 3B and the bottle shaft O (R1 <R2).

ここで、「ねじ山の高さ」を、ねじ部３（ねじ山３Ａ，３Ｂ）において、底部３１を連ねた線Ｌと頂部３０との距離の最大値と定義する。また、ねじ部３は、ねじ始点から徐々にねじ山が高くなって略一定のねじ山の高さになるが、ねじ始点から徐々にねじ山が高くなっている範囲を不完全ねじ部、略一定のねじ山の高さの範囲を完全ねじ部と定義する。図２においては、ねじ部３の一段目のねじ山３Ａの高さが、頂部３０と直線Ｌとの距離Ｔ１であり、二段目のねじ山３Ｂの高さが、頂部３０と直線Ｌとの距離Ｔ２になる。本発明の実施形態においては、略等しく（等しくも含む）、（Ｔ１≒Ｔ２、Ｔ１＝Ｔ２）なるように形成されている。 Here, the "thread height" is defined as the maximum value of the distance between the line L connecting the bottom portions 31 and the top portion 30 in the threaded portions 3 (thread threads 3A and 3B). Further, in the threaded portion 3, the thread gradually increases from the screw start point to reach a substantially constant thread height, but the range in which the thread gradually increases from the thread start point is an incomplete thread portion, which is omitted. A range of constant thread height is defined as a complete thread. In FIG. 2, the height of the first-stage thread 3A of the threaded portion 3 is the distance T1 between the top portion 30 and the straight line L, and the height of the second-stage thread 3B is the height of the top portion 30 and the straight line L. Distance T2. In the embodiment of the present invention, it is formed so as to be substantially equal (including equal) and (T1≈T2, T1 = T2).

図３は、金属製ボトル１の口金部２におけるカール部４の形成状態を示している。前述したように、カール部４はねじ部３の形成後に形成される。このため、カール部４のカール加工後は、ねじ部３、特に一段目のねじ山３Ａは外側に突出するように変形することになる。そして、カール部４の形成後には、ねじ部３の一段目のねじ山３Ａの頂部３０とボトル軸Ｏとの距離Ｒ１’と、二段目のねじ山３Ｂの頂部３０とボトル軸Ｏとの距離Ｒ２’ が略等しく（等しくも含む）、（Ｒ１’≒Ｒ２’、Ｒ１’＝Ｒ２’）形成される。 FIG. 3 shows the formation state of the curl portion 4 in the base portion 2 of the metal bottle 1. As described above, the curl portion 4 is formed after the thread portion 3 is formed. Therefore, after the curl processing of the curl portion 4, the screw portion 3, particularly the first-stage thread 3A, is deformed so as to project outward. Then, after the curl portion 4 is formed, the distance R1'between the top portion 30 of the first-stage thread 3A of the screw portion 3 and the bottle shaft O, and the top portion 30 of the second-stage screw thread 3B and the bottle shaft O The distances R2'are substantially equal (including equal), and (R1'≈R2', R1'= R2') are formed.

このような構成を有する本発明の実施形態によると、ねじ部３の形成後でカール部４の形成前の状態では、ねじ部３の一段目のねじ山３Ａの頂部３０とボトル軸Ｏとの距離Ｒ１が、二段目のねじ山３Ｂの頂部３０とボトル軸Ｏとの距離Ｒ２より小さく（Ｒ１＜Ｒ２）形成されている。このため、カール部４の形成時にねじ部３の一段目のねじ山３Ａが拡径変形した場合にも、ねじ山３Ａの頂部３０がねじ山３Ｂの頂部３０より外側に突出するのを防ぐことができる。これによって、キャップ５の開閉操作を円滑に行うことが可能になる。 According to the embodiment of the present invention having such a configuration, in the state after the formation of the threaded portion 3 and before the formation of the curl portion 4, the top portion 30 of the first-stage thread 3A of the threaded portion 3 and the bottle shaft O are formed. The distance R1 is formed to be smaller than the distance R2 between the top 30 of the second-stage thread 3B and the bottle shaft O (R1 <R2). Therefore, even if the first-stage thread 3A of the thread 3 is expanded and deformed during the formation of the curl portion 4, the top 30 of the thread 3A is prevented from protruding outward from the top 30 of the thread 3B. Can be done. This makes it possible to smoothly open and close the cap 5.

そして、ねじ部３の形成後でカール部４の形成前の状態で、ねじ部３の一段目のねじ山３Ａの高さ（距離Ｔ１）と、二段目のねじ山３Ｂの高さ（距離Ｔ２）が略等しく（等しくも含む）（Ｔ１≒Ｔ２、Ｔ１＝Ｔ２）形成されているので、カール部４の形成後には、一段目のねじ山３Ａが拡径変形することで、一段目のねじ山３Ａの高さ（距離Ｔ１’）が、二段目のねじ山３Ｂの高さ（距離Ｔ２’）より高く形成されることになる（Ｔ１’＞Ｔ２’）。これによって、キャップ５を被着した状態で、一段目のねじ山３Ａの高さ（距離Ｔ１’）を十分に高く設定でき、ボトル内圧が高い場合にも、ねじ部３によるキャップ５の密封性を十分に確保することができる。 Then, in the state after the formation of the screw portion 3 and before the formation of the curl portion 4, the height (distance T1) of the first-stage screw thread 3A and the height (distance T1) of the second-stage screw thread 3B of the screw portion 3 are formed. Since T2) is formed substantially equal (including equality) (T1≈T2, T1 = T2), after the curl portion 4 is formed, the thread 3A of the first stage is expanded and deformed, so that the first stage is formed. The height of the thread 3A (distance T1') is formed higher than the height of the second thread 3B (distance T2') (T1'> T2'). As a result, the height (distance T1') of the first-stage thread 3A can be set sufficiently high with the cap 5 attached, and the cap 5 can be sealed by the threaded portion 3 even when the bottle internal pressure is high. Can be sufficiently secured.

また、ねじ部３の一段目のねじ山３Ａの高さを比較的高くすることで、ねじ谷を深くすることができるので、キャッピング加工時に、キャッピング装置の加工ローラがねじ谷に入り易くなり、キャッピング加工がし易くなる。 Further, by making the height of the first-stage thread 3A of the threaded portion 3 relatively high, the thread valley can be deepened, so that the processing roller of the capping device can easily enter the thread valley during the capping process. Capping processing becomes easier.

更には、ねじ部３の一段目のねじ山３Ａの高さを比較的高くすることで、キャップ５を再栓する際に、キャップ５がねじ山を探しやすくなるので、再栓の操作を円滑に行うことが可能になる。 Furthermore, by making the height of the first-stage thread 3A of the threaded portion 3 relatively high, when the cap 5 is re-plugged, the cap 5 can easily find the thread, so that the re-plugging operation is smooth. It will be possible to do it.

また、図３に示すように、本発明の実施形態に係る金属製ボトル１は、ボトル軸Ｏに対してねじ部３の底部３１を連ねた線Ｌが上に行く程中心寄りに傾斜している。これによって、金属製ボトル１全体の軸荷重強度が増すことになり、変形し難く、口金部２に形成されたねじ部３の落下時の衝撃耐性を高めることができる。 Further, as shown in FIG. 3, the metal bottle 1 according to the embodiment of the present invention is inclined toward the center as the line L connecting the bottom portions 31 of the threaded portions 3 goes upward with respect to the bottle shaft O. There is. As a result, the axial load strength of the entire metal bottle 1 is increased, it is difficult to be deformed, and the impact resistance when the screw portion 3 formed in the base portion 2 is dropped can be enhanced.

なお、前述した実施形態では、ねじ部３は一段目のねじ山３Ａと二段目のねじ山３Ｂを有する例を示しているが、本発明におけるねじ部３は、図４に示すように、三段目以上にねじ部（ねじ山）を備えるものであってもよい。 In the above-described embodiment, the threaded portion 3 has an example of having a first-step thread thread 3A and a second-step thread thread 3B, but the threaded portion 3 in the present invention is as shown in FIG. It may be provided with a screw portion (thread) in the third stage or higher.

図４は、ねじ部３が一段目のねじ山３Ｘと二段目のねじ山３Ｙと三段目のねじ山３Ｚを備える例を示してる。この例では、図４（ａ）に示すカール加工前は、三段のねじ山３Ｘ，３Ｙ，３Ｚのねじ山の高さＴ０１，Ｔ０２，Ｔ０３の関係は、（Ｔ０１≒Ｔ０２≒Ｔ０３、Ｔ０１＝Ｔ０２＝Ｔ０３）になっている。また、ねじ山３Ｘ，３Ｙ，３Ｚの頂部３０とボトル軸Ｏとの距離Ｒ０１，Ｒ０２，Ｒ０３の関係は、（Ｒ０１＜Ｒ０２≒Ｒ０３、Ｒ０１＜Ｒ０２＝Ｒ０３）になっている。 FIG. 4 shows an example in which the threaded portion 3 includes a first-stage thread 3X, a second-stage thread 3Y, and a third-stage thread 3Z. In this example, before the curl processing shown in FIG. 4A, the relationship between the thread heights T01, T02, and T03 of the three-stage thread 3X, 3Y, and 3Z is (T01≈T02≈T03, T01 = T02 = T03). Further, the relationship between the distances R01, R02, and R03 between the top 30 of the thread 3X, 3Y, and 3Z and the bottle shaft O is (R01 <R02≈R03, R01 <R02 = R03).

そして、図４（ｂ）に示すカール部４を形成するカール加工後には、三段のねじ山３Ｘ，３Ｙ，３Ｚのねじ山の高さＴ０１’，Ｔ０２’，Ｔ０３’の関係は、（Ｔ０１’＞Ｔ０２’≒Ｔ０３’、Ｔ０１’＞Ｔ０２’ ＝Ｔ０３’）になり、ねじ山３Ｘ，３Ｙ，３Ｚの頂部３０とボトル軸Ｏとの距離Ｒ０１’，Ｒ０２’，Ｒ０３’の関係は、（Ｒ０１’≒Ｒ０２’≒Ｒ０３’、Ｒ０１’＝Ｒ０２’ ＝Ｒ０３’）になっている。 Then, after the curling process for forming the curl portion 4 shown in FIG. 4 (b), the relationship between the thread heights T01', T02', and T03'of the three-stage threads 3X, 3Y, and 3Z is (T01). '> T02'≈ T03', T01'> T02'= T03'), and the distance between the top 30 of the thread 3X, 3Y, 3Z and the bottle shaft O is R01', R02', R03'. R01'≈R02'≈R03', R01'= R02'= R03').

以上説明したように、本発明の実施形態に係る金属製ボトルの製造方法は、ねじ式のキャップの円滑な開閉を保ちつつ、ボトルの内圧が高くなる場合にねじ部によるキャップの密封が確実に行われ、キャッピング加工のしやすさ、キャップ再栓の操作性の向上、落下衝撃耐性の向上などが可能な金属製ボトルを容易に製造することができる。また、前述した実用的に有利な効果を呈する金属製ボトルとすることができる。 As described above, in the method for manufacturing a metal bottle according to the embodiment of the present invention, the cap is surely sealed by the screw portion when the internal pressure of the bottle becomes high while maintaining the smooth opening and closing of the screw type cap. It is possible to easily manufacture a metal bottle that can be easily capped, improve the operability of re-plugging the cap, and improve the resistance to drop impact. Further, it is possible to obtain a metal bottle having the above-mentioned practically advantageous effect.

１：金属製ボトル，１Ａ：ボトル本体，２：口金部，
３：ねじ部，４：カール部，５：キャップ，５Ａ：キャップ本体，
５Ｂ：スコア部，５Ｃ：ブリッジ部，５Ｄ：リング部，
３０：頂部，３１：底部 1: Metal bottle, 1A: Bottle body, 2: Base part,
3: Screw part, 4: Curl part, 5: Cap, 5A: Cap body,
5B: Score part, 5C: Bridge part, 5D: Ring part,
30: top, 31: bottom

Claims (1)

有底筒状のボトル本体の上部に口金部を有し、該口金部にねじ部を有すると共に、前記口金部の先端にカール部を有する金属製ボトルであって、
完全ねじ部における、前記ねじ部の底部を連ねた直線と先端側から一段目のねじ山の頂部との距離であるねじ山の高さが、前記直線と先端側から二段目のねじ山の頂部との距離であるねじ山の高さより高く、前記一段目のねじ山の頂部とボトル軸との距離と、前記二段目のねじ山の頂部と前記ボトル軸との距離が略等しいことを特徴とする金属製ボトル。 A metal bottle having a base portion at the upper part of a bottomed cylindrical bottle body, a screw portion at the base portion, and a curl portion at the tip of the base portion.
In the complete threaded portion , the height of the thread, which is the distance between the straight line connecting the bottoms of the threaded portion and the top of the first thread thread from the tip side, is the height of the straight line and the second step thread from the tip side. It is higher than the height of the thread, which is the distance from the top, and the distance between the top of the first-stage screw thread and the bottle shaft is substantially equal to the distance between the top of the second-stage screw thread and the bottle shaft. Characterized metal bottle.
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