JP2021195140A - Fastening ring for metal drum, and metal drum - Google Patents

Fastening ring for metal drum, and metal drum Download PDF

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JP2021195140A
JP2021195140A JP2020101371A JP2020101371A JP2021195140A JP 2021195140 A JP2021195140 A JP 2021195140A JP 2020101371 A JP2020101371 A JP 2020101371A JP 2020101371 A JP2020101371 A JP 2020101371A JP 2021195140 A JP2021195140 A JP 2021195140A
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top plate
band member
drum
side region
tightening
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JP7426905B2 (en
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克己 小島
Katsumi Kojima
克範 藤村
Katsunori Fujimura
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JFE Container Co Ltd
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Abstract

To provide a fastening ring for a metal drum, and a metal drum, such that internal pressure resistance of the metal drum is improved with a drum body and a top plate fastened with a bolt type fastening ring.SOLUTION: There is provided a fastening ring 100 for a metal drum that is fitted to an open metal drum which has a top plate 7 attached to and detached from a drum body 6, and needs to have internal pressure resistance, and fastens the drum body and top plate together by tightening operation by a fastening member, and has a band member 110 which is in a discontinuous circular shape, and fastens the peripheral edge parts of both the top plate and drum body, and first and second fitting members 2, 3 which retain the fastening member at the band member, wherein the band member has a top plate-side region 111 and a body-side region 112, and the top plate-side region has a deformation inducing part 120 which intentionally causes the top plate to deform at a desired place as the internal pressure of the metal drum rises.SELECTED DRAWING: Figure 1

Description

本発明は、オープンドラム缶の缶胴体に天板を締結するドラム缶用締め輪、及び該ドラム缶用締め輪を取り付けたドラム缶に関する。 The present invention relates to a drum can tightening ring in which a top plate is fastened to a can body of an open drum can, and a drum can to which the drum can tightening ring is attached.

缶胴体に対して天板が着脱可能でＪＩＳ Ｚ １６００に規定される鋼製のオープンドラム缶では、缶胴体内へ内容物を充填した後、蓋に該当する天板（オープンドラム缶の場合、天蓋と呼ばれる場合もある。）が缶胴体に取り付けられ閉止される。蓋をした後、図８に示すようなＵあるいはＶ字形の断面を有しドラム缶用締め輪１０を構成するバンド部材１が、図９に示すように、缶胴体６と天板７との接合部分に取り付けられ、バンド部材１をボルト４及びナット５にて締め込むことで、缶胴体６と天板７とが締結される。天板７における上記接合部分には、通常パッキンが設けられており、上記締結によりパッキンが変形し内容物の漏洩が防止され、例えば１００ｋＰａ程度までの内圧に耐えることができる。よって、このようなオープンドラム缶５０は、耐内圧用（液体危険物用）ドラム缶としても使用可能である。 The top plate can be attached to and detached from the can body, and in the case of steel open drum cans specified in JIS Z 1600, after filling the inside of the can body with the contents, the top plate corresponding to the lid (in the case of an open drum can, the canopy) (Sometimes called) is attached to the body of the can and closed. After the lid is closed, the band member 1 having a U or V-shaped cross section as shown in FIG. 8 and constituting the tightening ring 10 for the drum can joins the can body 6 and the top plate 7 as shown in FIG. The can body 6 and the top plate 7 are fastened by being attached to the portion and tightening the band member 1 with the bolt 4 and the nut 5. A packing is usually provided at the joint portion of the top plate 7, and the packing is deformed by the above fastening to prevent leakage of the contents, and can withstand an internal pressure of, for example, up to about 100 kPa. Therefore, such an open drum can 50 can also be used as a drum can for internal pressure resistance (for liquid dangerous goods).

このような耐内圧用（液体危険物用）ドラム缶は、密閉型ドラム缶の場合と同様に、危険物輸送に関する国連勧告(ＵＮ規格=UN Recommendations on the Transport of Dangerous Goods)に定められている気密試験、落下強度試験、水圧強度試験、及び積み重ね試験の各判定基準に適合する必要がある。例えば上述のバンド部材１を用いることで、各判定基準に適合することができる。 Such internal pressure resistant (liquid dangerous goods) drum cans have an airtight test specified in the UN Recommendations on the Transport of Dangerous Goods, as in the case of closed-type drums. , Drop strength test, hydraulic strength test, and stacking test must be met. For example, by using the above-mentioned band member 1, each determination criterion can be met.

一方、上述の、ボルト４、ナット５を用いたドラム缶用締め輪１０であるボルト式の締め輪（以下、「ボルト式締め輪」とも記す）１０では、図８に示すようにバンド部材１は、円周の一部を切り欠いたＣ字形にてなり、バンド部材１の両端部には、ボルト４を挿通するための取付部材２，３がそれぞれ溶接されている。ここで、通常、バンド部材１の両端１ａ、１ｂと、取付部材２、３の各端２ａ，３ａとが一致するようにして、取付部材２，３はバンド部材１に溶接されている。このような構造から、たとえボルト４及びナット５にてバンド部材１の両端１ａ、１ｂ、あるいは取付部材２、３の各端２ａ，３ａが当接するまでバンド部材１を締め込んだとしても、バンド部材１の両端１ａ、１ｂ、あるいは端２ａ，３ａの間には、物理的に不連続な部分（以下、「欠如部８」と記す。）が存在する。 On the other hand, in the bolt-type tightening ring (hereinafter, also referred to as "bolt-type tightening ring") 10, which is the above-mentioned tightening ring 10 for drums using bolts 4 and nuts 5, the band member 1 is as shown in FIG. , It has a C-shape with a part of the circumference cut out, and mounting members 2 and 3 for inserting bolts 4 are welded to both ends of the band member 1. Here, normally, the mounting members 2 and 3 are welded to the band member 1 so that both ends 1a and 1b of the band member 1 coincide with the ends 2a and 3a of the mounting members 2 and 3. Due to such a structure, even if the band member 1 is tightened by the bolts 4 and the nuts 5 until both ends 1a and 1b of the band member 1 or the ends 2a and 3a of the mounting members 2 and 3 come into contact with each other, the band is tightened. There is a physically discontinuous portion (hereinafter referred to as “missing portion 8”) between both ends 1a and 1b of the member 1 or the ends 2a and 3a.

よって、上述の圧力を超えて内圧が作用するようなときには、欠如部８付近にその応力が集中して、欠如部８が押し広げられる現象が発生する。その結果、図１０に示すように、欠如部８に対応した天板７の部分には、天板７が山状に膨れた状態で塑性変形したシワ、つまり塑性変形部９が発生し、結果的にパッキンによる封止が破れ、ドラム缶内の圧力低下が発生してしまう。
このように従来のオープンドラム５０缶では、上述の１００ｋＰａ程度の従来値を超えての耐内圧性能、あるいは該従来値での規定時間を超える耐内圧性能を向上させることは困難であるという問題があった。 Therefore, when the internal pressure exceeds the above-mentioned pressure, the stress is concentrated in the vicinity of the missing portion 8 and the missing portion 8 is expanded. As a result, as shown in FIG. 10, wrinkles that are plastically deformed in a state where the top plate 7 is swollen in a mountain shape, that is, a plastically deformed portion 9, are generated in the portion of the top plate 7 corresponding to the missing portion 8. The sealing by the packing is broken, and the pressure inside the drum can drop.
As described above, with the conventional 50 cans of the open drum, there is a problem that it is difficult to improve the internal pressure resistance performance exceeding the conventional value of about 100 kPa described above or the internal pressure resistance performance exceeding the specified time at the conventional value. there were.

そこで本願出願人は、上述の耐内圧性能をさらに向上すべく、天板そのものに工夫を施したドラム缶用天板について既に提案を行い、特許を得ている（特許文献１）。 Therefore, the applicant of the present application has already proposed and obtained a patent for a top plate for drums in which the top plate itself is devised in order to further improve the above-mentioned internal pressure resistance performance (Patent Document 1).

特許第４８２５８８１号公報Japanese Patent No. 4825881

上述した従来のオープンドラム５０缶では、缶胴体６を形成する鋼板の厚み（加工前の公称厚さ）は、通常、１．２ｍｍである。缶胴体６の板厚は、パッキンを設けた天板７との接合部分の強度に関係し、上述の耐内圧性能に直接に影響を及ぼす要因の一つである。
一方、ドラム缶ユーザーからは、ドラム缶の軽量化及び価格低減が求められており、該求めに応じるためには、缶胴体６の板厚低減は有効な手段であるが、上述のように耐内圧性能に懸念が生じてしまう。したがってドラム缶メーカーには、ユーザー要求及び上述の性能向上の両方を満たす、更なる工夫が求められている。 In the above-mentioned 50 cans of the conventional open drum, the thickness (nominal thickness before processing) of the steel plate forming the can body 6 is usually 1.2 mm. The plate thickness of the can body 6 is related to the strength of the joint portion with the top plate 7 provided with the packing, and is one of the factors directly affecting the internal pressure resistance performance described above.
On the other hand, drum can users are demanding weight reduction and price reduction of drum cans, and in order to meet the demands, reduction of the plate thickness of the can body 6 is an effective means, but as described above, the internal pressure resistance performance. Will raise concerns. Therefore, drum manufacturers are required to make further efforts to meet both user requirements and the above-mentioned performance improvements.

一方、従来のオープンドラム缶において、上述の従来の耐内圧性能を向上させる手法として、上述のようにドラム缶の天板側に工夫を施す他に、ボルト式締め輪に対して工夫を施す手法もあると考えられる。 On the other hand, in the conventional open drum can, as a method for improving the above-mentioned conventional internal pressure resistance performance, in addition to devising the top plate side of the drum can as described above, there is also a method of devising a bolt type tightening wheel. it is conceivable that.

本発明は、ボルト式締め輪によってドラム缶胴体と天板とが締結された状態のドラム缶における耐内圧性能を従来に比して向上可能にする、ドラム缶用締め輪、及び該ドラム缶用締め輪を取り付けたドラム缶を提供することを目的とする。 The present invention attaches a drum tightening ring and a drum can tightening ring that can improve the internal pressure resistance performance of a drum can in a state where the drum body and the top plate are fastened by a bolt type tightening ring. The purpose is to provide drums.

上記目的を達成するため、本発明は以下のように構成する。
即ち、本発明の第１態様におけるドラム缶用締め輪は、缶胴体に対して天板が着脱可能でありかつ耐内圧性能が要求されるオープンドラム缶に取り付けられ、締結用部材による締め付け動作により上記缶胴体と上記天板とを締結するドラム缶用締め輪であって、
円周の一箇所を完全に取り除いた欠如部を有する不連続な円形状にてなり、上記天板の周縁部及び上記缶胴体の開口周縁部を挟んで取り付けられ天板及び缶胴体の両方の周縁部を締結するバンド部材と、
上記締結用部材を上記バンド部材に保持する部材であり、上記欠如部における上記バンド部材の一端部にて上記バンド部材に固定される第１取付部材と、
上記締結用部材を上記バンド部材に保持する部材であり、上記欠如部における上記バンド部材の他端部にて上記バンド部材に固定される第２取付部材と、を備え、
上記バンド部材は、取付状態において、天板周縁部に接する天板側領域及び上記開口周縁部に接する胴体側領域を有し、少なくとも上記天板側領域は、当該バンド部材の周方向における所望箇所に変形誘発部を有し、該変形誘発部は、密閉された当該ドラム缶の内圧上昇に起因して生じる上記天板の変形を当該天板における上記所望箇所にて意図的に誘発させる部分である、
ことを特徴とする。 In order to achieve the above object, the present invention is configured as follows.
That is, the tightening ring for a drum can according to the first aspect of the present invention is attached to an open drum can whose top plate is removable from the can body and is required to have internal pressure resistance, and the can is tightened by a fastening member. A tightening ring for drums that fastens the body and the top plate.
It has a discontinuous circular shape with a missing part with one part of the circumference completely removed, and is attached by sandwiching the peripheral edge of the top plate and the opening peripheral edge of the can body, and both the top plate and the can body. With the band member that fastens the peripheral part,
A member that holds the fastening member to the band member, and a first mounting member that is fixed to the band member at one end of the band member in the missing portion.
A member that holds the fastening member to the band member, and includes a second mounting member that is fixed to the band member at the other end of the band member in the missing portion.
The band member has a top plate side region in contact with the peripheral edge portion of the top plate and a body side region in contact with the peripheral edge portion of the opening in the mounted state, and at least the top plate side region is a desired portion in the circumferential direction of the band member. The deformation-inducing portion is a portion that intentionally induces deformation of the top plate caused by an increase in the internal pressure of the sealed drum can at the desired location on the top plate. ,
It is characterized by that.

また、本発明の第２態様におけるドラム缶は、缶胴体と、上記缶胴体に対して着脱可能である天板と、を有し、耐内圧性能が要求されるオープンドラム缶であって、
付属の締結用部材による締め付け動作により上記缶胴体と上記天板とを締結する、上記第１態様におけるドラム缶用締め輪をさらに備えたことを特徴とする。 Further, the drum can according to the second aspect of the present invention is an open drum can having a can body and a top plate that can be attached to and detached from the can body and is required to have internal pressure resistance.
It is further provided with a drum tightening ring according to the first aspect, which fastens the can body and the top plate by a tightening operation by an attached fastening member.

本発明の第１態様におけるドラム缶用締め輪、及び第２態様のオープンドラム缶によれば、バンド部材における天板側領域に変形誘発部を設けたことで、上述の従来値を超えて内圧が作用した場合には、天板において、変形誘発部に対応した部分でも変形が発生し易くなる。したがって、従来のように上記不連続部分に対応した一箇所に応力が集中することを回避することができ、応力を分散させることができる。その結果、内圧により天板が変形する場合でも、それぞれの変形箇所の変形量は低減され、内圧低下を生じさせる程度の変形量に至るまでの変形を遅らせることができる。したがって、当該オープンドラム缶の耐内圧性能を従来に比べて向上させることができる。 According to the tightening ring for the drum can in the first aspect of the present invention and the open drum can in the second aspect, the internal pressure acts beyond the above-mentioned conventional value by providing the deformation inducing portion in the top plate side region of the band member. If this is the case, deformation is likely to occur even in the portion of the top plate corresponding to the deformation inducing portion. Therefore, it is possible to prevent the stress from concentrating in one place corresponding to the discontinuous portion as in the conventional case, and it is possible to disperse the stress. As a result, even when the top plate is deformed by the internal pressure, the amount of deformation at each deformed portion is reduced, and the deformation can be delayed until the amount of deformation causes a decrease in the internal pressure. Therefore, the internal pressure resistance performance of the open drum can can be improved as compared with the conventional case.

さらにまた、このような効果を奏するドラム缶用締め輪によれば、ドラム缶の缶胴体について、従来よりも薄い鋼板を使用して形成することが可能になる。したがって、耐内圧性能の向上を図り、かつドラム缶の軽量化及び価格低減をも図ることが可能になる。 Furthermore, according to the tightening ring for drums having such an effect, it becomes possible to form the can body of the drum can by using a steel plate thinner than the conventional one. Therefore, it is possible to improve the internal pressure resistance performance, reduce the weight of the drum can, and reduce the price.

本発明の実施形態におけるドラム缶用締め輪の一例を示す平面図である。It is a top view which shows an example of the tightening ring for a drum can in an embodiment of this invention. 図１に示すＡ部を示す図であり、図１のドラム缶用締め輪に備わる変形誘発部の一形態である凸部の一例を示す斜視図である。It is a figure which shows the part A shown in FIG. 1, and is the perspective view which shows an example of the convex part which is one form of the deformation inducing part provided in the tightening ring for a drum can of FIG. 図２に示す変形誘発部の箇所におけるバンド部材の断面図である。It is sectional drawing of the band member in the place of the deformation inducing part shown in FIG. 図２に示す変形誘発部の変形例の一例におけるバンド部材の断面図である。It is sectional drawing of the band member in an example of the deformation of the deformation inducing part shown in FIG. 図１に示す変形誘発部の他の形態であるスリット付き凸部の一例を示す斜視図である。FIG. 3 is a perspective view showing an example of a convex portion with a slit, which is another form of the deformation-inducing portion shown in FIG. 1. 図１に示す変形誘発部の別の形態であるスリット単独部の一例を示す斜視図である。It is a perspective view which shows an example of the slit alone part which is another form of the deformation inducing part shown in FIG. 図５Ａに示すスリット単独部の箇所におけるバンド部材の断面図である。It is sectional drawing of the band member in the part of the slit single part shown in FIG. 5A. 図５Ａ及び図５Ｂに示すスリットの形状の一例を示す斜視図である。It is a perspective view which shows an example of the shape of the slit shown in FIG. 5A and FIG. 5B. 図５Ａ及び図５Ｂに示すスリットの形状の一例を示す斜視図である。It is a perspective view which shows an example of the shape of the slit shown in FIG. 5A and FIG. 5B. 缶胴体に天板で蓋をし、図１に示すドラム缶用締め輪を取り付けた状態を示す断面図である。It is sectional drawing which shows the state which covered the can body with a top plate, and attached the tightening ring for a drum can shown in FIG. 本出願人の特許第５４０９０２３号におけるドラム缶用締め輪の概略を示す平面図である。It is a top view which shows the outline of the tightening ring for a drum can in Japanese Patent No. 5409023 of this applicant. 従来のドラム缶用締め輪を示す斜視図である。It is a perspective view which shows the conventional tightening ring for a drum can. 図８に示すドラム缶用締め輪を、缶胴体に天板で蓋をして取り付けた状態を示す図である。It is a figure which shows the state in which the tightening ring for a drum can shown in FIG. 8 is attached to a can body with a lid covered with a top plate. 図８に示すドラム缶用締め輪を取り付けたドラム缶に内圧が作用し天板に塑性変形部が生じた状態を示す斜視図である。FIG. 8 is a perspective view showing a state in which an internal pressure is applied to a drum can to which a tightening ring for a drum can is attached as shown in FIG. 8 to generate a plastically deformed portion on the top plate.

本発明の実施形態であるドラム缶用締め輪、及び該ドラム缶用締め輪を取り付けたドラム缶について、図を参照しながら以下に説明する。尚、各図において、同一又は同様の構成部分については同じ符号を付している。また、以下の説明が不必要に冗長になるのを避け当業者の理解を容易にするため、既によく知られた事項の詳細説明及び実質的に同一の構成に対する重複説明を省略する場合がある。また、以下の説明及び添付図面の内容は、特許請求の範囲に記載の主題を限定することを意図するものではない。又、各図では、説明箇所を誇張して図示している場合があり、各構成部分の実際の寸法関係とは一致しない部分が存在する。 A drum tightening ring according to an embodiment of the present invention and a drum can to which the drum can tightening ring is attached will be described below with reference to the drawings. In each figure, the same or similar components are designated by the same reference numerals. In addition, in order to avoid unnecessary redundancy of the following explanations and to facilitate the understanding of those skilled in the art, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. .. In addition, the following description and the contents of the attached drawings are not intended to limit the subject matter described in the claims. Further, in each drawing, the explanation part may be exaggerated and shown, and there is a part that does not match the actual dimensional relationship of each component part.

第１実施形態；
図１に示すような、ボルト式締め輪である本実施形態におけるドラム缶用締め輪１００は、既に説明した、缶胴体６に対して天板７が着脱可能な従来のオープンドラム缶５０（ＪＩＳ Ｚ １６００に規定される鋼製のオープンドラム缶）に取り付けられ、付属の締付用部材としての一例に相当するボルト４、ナット５による締め付け動作により缶胴体６と天板７とを締結する部材である。このようなドラム缶用締め輪１００にて上記締結が行われるオープンドラム缶５０は、缶胴体６と天板７との係合部分にパッキン７ｂ（図６）を設けることで耐内圧用のオープンドラム缶として用いられ、本実施形態では内容量２００リットルのものを例に採る。尚、パッキン７ｂは、天板７の周縁部７ａ（図２、天板周縁部７ａとも記す。）におけるカール部の溝内に配置され、例えば、天然ゴム、天然ゴムとスチレンブタジエンゴムとの混合物、ネオプレーンゴム、シリコーンゴムが使用可能である。また一例として、本実施形態では、天板７及び缶胴体６の直径は約６００ｍｍ、材料はＳＰＣＣ（冷間圧延鋼板）であり、天板７の鋼板厚みは１．２ｍｍ、缶胴体６の鋼板厚みは１．０ｍｍである。尚、これらの鋼板厚さは、いずれも缶胴体６等への加工前の板厚寸法（いわゆる公称厚さ）であるが、加工方法によっては殆ど減肉が生じない場合もあり、このとき上記厚さは、加工後の板厚寸法と読み替えることもできる。 First Embodiment;
As shown in FIG. 1, the drum can tightening ring 100 in the present embodiment, which is a bolt-type tightening ring, is a conventional open drum can 50 (JIS Z 1600) to which the top plate 7 can be attached to and detached from the can body 6 as described above. It is a member that is attached to a steel open drum can specified in 1) and fastens the can body 6 and the top plate 7 by a tightening operation with bolts 4 and nuts 5, which correspond to an example of an attached tightening member. The open drum can 50 to be fastened with such a tightening ring 100 for a drum can can be used as an open drum can for internal pressure resistance by providing a packing 7b (FIG. 6) at an engaging portion between the can body 6 and the top plate 7. It is used, and in this embodiment, the one having an internal capacity of 200 liters is taken as an example. The packing 7b is arranged in the groove of the curl portion in the peripheral edge portion 7a of the top plate 7 (FIG. 2, also referred to as the top plate peripheral edge portion 7a), and is, for example, natural rubber, a mixture of natural rubber and styrene-butadiene rubber. , Neoplane rubber and silicone rubber can be used. Further, as an example, in the present embodiment, the diameter of the top plate 7 and the can body 6 is about 600 mm, the material is SPCC (cold rolled steel plate), the steel plate thickness of the top plate 7 is 1.2 mm, and the steel plate of the can body 6 is steel plate. The thickness is 1.0 mm. All of these steel plate thicknesses are the plate thickness dimensions (so-called nominal thickness) before processing into the can body 6 and the like, but depending on the processing method, almost no wall thinning may occur, and at this time, the above The thickness can also be read as the plate thickness dimension after processing.

勿論、２００リットルのドラム缶に限定するものではなく、ドラム缶用締め輪１００は、耐内圧性能が要求される缶容器全般に適用可能である。又、本実施形態では、締付用部材としてボルト４、ナット５を使用するが、これに限定するものではなく、缶胴体６と天板７とを締結するようにドラム缶用締め輪１００を締め付け可能な部材、機構が使用可能である。 Of course, it is not limited to a 200-liter drum can, and the tightening ring 100 for a drum can can be applied to all can containers that require internal pressure resistance. Further, in the present embodiment, bolts 4 and nuts 5 are used as tightening members, but the present invention is not limited to these, and the drum can tightening ring 100 is tightened so as to fasten the can body 6 and the top plate 7. Possible members and mechanisms can be used.

上述のようなドラム缶用締め輪１００は、基本的構成として、バンド部材１１０と、第１取付部材２と、第２取付部材３とを備え、付属に締付用部材としてのボルト４、ナット５を有する。よって、本実施形態におけるドラム缶用締め輪１００は、バンド部材１１０以外、従来の締め輪における構成に同じである。また、当該ドラム缶用締め輪１００も、ボルト式締め輪と呼ぶことができる。 As a basic configuration, the drum tightening ring 100 as described above includes a band member 110, a first mounting member 2, and a second mounting member 3, and is attached with bolts 4 and nuts 5 as tightening members. Has. Therefore, the drum tightening ring 100 in the present embodiment has the same configuration as the conventional tightening ring except for the band member 110. Further, the drum tightening ring 100 can also be referred to as a bolt type tightening ring.

バンド部材１１０は、図６に示すように、天板７の天板周縁部７ａと缶胴体６の開口周縁部６ａとを締結するため、ほぼＵ字形あるいはＶ字形の縦断面を有し、バンド部材１１０の周囲の一箇所を完全に取り除いた切欠部８を設けた不連続な平面図でＣ字形の円形状で鋼製の部材である。切欠部８を有することから、上記締付用部材による締め付け動作により締め込みが可能である。本実施形態におけるバンド部材１１０は、一例として、材料がＳＰＨＣ（熱間圧延鋼板）から作製され、その厚み（呼び厚さ）は、２．３ｍｍである。尚、「呼び厚さ」には、その他、１．６ｍｍ、２．０ｍｍも存在し、バンド部材１１０は、これらの呼び厚さの鋼板を使用して作製することも可能である。 As shown in FIG. 6, the band member 110 has a substantially U-shaped or V-shaped vertical cross section for fastening the top plate peripheral edge portion 7a of the top plate 7 and the opening peripheral edge portion 6a of the can body 6, and is a band. It is a C-shaped circular steel member in a discontinuous plan view provided with a notch 8 in which one portion around the member 110 is completely removed. Since it has the notch 8, it can be tightened by the tightening operation by the tightening member. As an example, the band member 110 in the present embodiment is made of SPHC (hot rolled steel plate) and has a thickness (nominal thickness) of 2.3 mm. In addition, the "nominal thickness" also includes 1.6 mm and 2.0 mm, and the band member 110 can be manufactured by using a steel plate having these nominal thicknesses.

第１取付部材２及び第２取付部材３は、共に、ボルト４、ナット５の締結用部材をバンド部材１１０に取り付けて保持するための部材であり、図８等を参照して既に説明したように、第１取付部材２は、欠如部８におけるバンド部材１１０の一端部１ａにてバンド部材１１０に固定され、第２取付部材３は、欠如部８におけるバンド部材１１０の他端部１ｂにてバンド部材１１０に固定される。 Both the first mounting member 2 and the second mounting member 3 are members for attaching and holding the fastening member of the bolt 4 and the nut 5 to the band member 110, and as described above with reference to FIG. 8 and the like. The first mounting member 2 is fixed to the band member 110 at one end 1a of the band member 110 in the missing portion 8, and the second mounting member 3 is fixed to the band member 110 at the other end 1b of the band member 110 in the missing portion 8. It is fixed to the band member 110.

バンド部材１１０についてはさらに詳しく説明を行う。
バンド部材１１０は、図６に示すようにほぼＵ字形あるいはＶ字形の断面において、天板７の天板周縁部７ａに接する天板側領域１１１、及び缶胴体６の開口周縁部６ａに接する胴体側領域１１２を有する。ここで、少なくとも天板側領域１１１は、図１に示すように、バンド部材１１０の周方向１１８における一又は複数の所望箇所に変形誘発部１２０を有する。当該変形誘発部１２０は、当該ドラム缶５０の内圧上昇に起因して生じる天板７の変形（膨れ）を、天板７の上記所望箇所に対応した箇所に意図的に誘発させる部分である。図１では、変形誘発部１２０は、バンド部材１１０の周方向１１８において２箇所に配置した場合を示しているが、周方向１１８における変形誘発部１２０の配置位置は、最低１箇所でもよく、さらに３箇所以上最大１５箇所まで配置することができる。 The band member 110 will be described in more detail.
As shown in FIG. 6, the band member 110 has a substantially U-shaped or V-shaped cross section, and the top plate side region 111 in contact with the top plate peripheral portion 7a of the top plate 7 and the fuselage in contact with the opening peripheral edge portion 6a of the can body 6. It has a side region 112. Here, at least the top plate side region 111 has the deformation inducing portion 120 at one or a plurality of desired positions in the circumferential direction 118 of the band member 110, as shown in FIG. The deformation inducing portion 120 is a portion that intentionally induces deformation (swelling) of the top plate 7 caused by an increase in the internal pressure of the drum can 50 to a portion corresponding to the desired portion of the top plate 7. FIG. 1 shows a case where the deformation inducing portions 120 are arranged at two locations in the circumferential direction 118 of the band member 110, but the deformation inducing portions 120 may be arranged at at least one location in the circumferential direction 118, and further. It can be arranged at 3 or more locations and up to 15 locations.

変形誘発部１２０について、詳しく説明する。
変形誘発部１２０の一形態として、図２に示すような凸部１２２が考えられる。該凸部１２２は、バンド部材１１０を当該ドラム缶５０に取り付けた取付状態において、バンド部材１１０を反天板側７ｃの方へ変形させた部分であり、バンド部材１１０の天板側領域１１１と天板７の天板周縁部７ａとが非接触となる部分である。このような非接触部分をバンド部材１１０に形成することで、密閉状態におけるドラム缶５０の内圧が高まった際に、凸部１２２に対応した天板７の箇所における変形（膨れ）が容易になる。よって、天板７において、内圧上昇に起因した応力の集中化を抑制して応力の分散化を図ることができ、ドラム缶５０の耐内圧性能の向上が可能になる。 The deformation inducing unit 120 will be described in detail.
As one form of the deformation inducing portion 120, a convex portion 122 as shown in FIG. 2 can be considered. The convex portion 122 is a portion in which the band member 110 is deformed toward the anti-top plate side 7c in the mounted state in which the band member 110 is attached to the drum can 50. This is a portion where the peripheral portion 7a of the top plate of the plate 7 is not in contact with the peripheral portion 7a. By forming such a non-contact portion on the band member 110, when the internal pressure of the drum can 50 in the closed state is increased, the top plate 7 corresponding to the convex portion 122 is easily deformed (bulged). Therefore, in the top plate 7, it is possible to suppress the concentration of stress due to the increase in internal pressure and to disperse the stress, and it is possible to improve the internal pressure resistance performance of the drum can 50.

凸部１２２は、バンド部材１１０を例えばプレス加工することで形成可能であり、微視的には図２に示すように、バンド部材１１０の周方向１１８に沿って台形形状になる。しかしながら、凸部１２２の形状は、凸部１２２の形成方法に依存し、四角形状等であってもよく、その形状は問わない。 The convex portion 122 can be formed by, for example, pressing the band member 110, and microscopically, as shown in FIG. 2, the convex portion 122 has a trapezoidal shape along the circumferential direction 118 of the band member 110. However, the shape of the convex portion 122 depends on the method of forming the convex portion 122, and may be a quadrangular shape or the like, and the shape is not limited.

凸部１２２における、バンド部材１１０の周方向１１８における当該凸部の長さＬ１、つまり天板側領域１１１と天板周縁部７ａとが非接触となる長さは、天板７の周囲長さの約０．２％から２．２％程度の範囲に設定している。一例として、長さＬ１は、約４ｍｍから約４０ｍｍに設定可能である。この範囲は、凸部１２２の形成方法との関係から、及び、出願人の実験等によって設定されたもので、長さＬ１が上記２．２％を超えた場合には、長さＬ１と、天板７への意図的変形作用との間に顕著な関連が見られなくなることから、上限値は、２．２％に決定したものである。 The length L1 of the convex portion in the convex portion 122 in the circumferential direction 118 of the band member 110, that is, the length at which the top plate side region 111 and the top plate peripheral edge portion 7a are not in contact with each other is the peripheral length of the top plate 7. It is set in the range of about 0.2% to 2.2%. As an example, the length L1 can be set from about 4 mm to about 40 mm. This range is set from the relationship with the method of forming the convex portion 122 and by the experiment of the applicant, and when the length L1 exceeds the above 2.2%, the length L1 is set. The upper limit was determined to be 2.2% because no significant association was found with the intentional deformation action on the top plate 7.

また凸部１２２は、本実施形態では図３Ａに示すように、バンド部材１１０の縦断面における円弧方向１１７に沿って天板側領域１１１のほぼ半分あるいは半分を超える程度の範囲にわたり形成している。具体的には、バンド部材１１０の頂点１１３である、天板側領域１１１と胴体側領域１１２との接合点を含む面からの仰角αにおいて、凸部１２２は、約３０度から約８０度の範囲に存在するように形成している。換言すると、変形誘発部１２０の一例に相当する凸部１２２は、本実施形態では、天板側領域１１１において、円弧方向１１７に沿って頂点１１３とは反対側に位置する始点１１１ａから、天板側領域１１１の例えば２／３程度までの範囲に延在している。尚、図３Ａにおいて、凸部１２２は、円弧方向１１７に沿っても台形形状にて示しているが、該形状も、上述と同様に形成方法に起因するものであり、凸部１２２の形状を限定する意図ではない。 Further, in the present embodiment, as shown in FIG. 3A, the convex portion 122 is formed over a range of about half or more than half of the top plate side region 111 along the arc direction 117 in the vertical cross section of the band member 110. .. Specifically, at the elevation angle α from the surface including the joint point between the top plate side region 111 and the body side region 112, which is the apex 113 of the band member 110, the convex portion 122 has a convex portion 122 of about 30 degrees to about 80 degrees. It is formed so that it exists in the range. In other words, in the present embodiment, the convex portion 122 corresponding to an example of the deformation inducing portion 120 is a top plate from the start point 111a located on the opposite side of the apex 113 along the arc direction 117 in the top plate side region 111. It extends to a range of, for example, about 2/3 of the side region 111. In FIG. 3A, the convex portion 122 is shown in a trapezoidal shape even along the arc direction 117, but the shape is also due to the forming method as described above, and the shape of the convex portion 122 is formed. It is not intended to be limited.

さらに凸部１２２は、図３Ａに示すように、天板側領域１１１のみに形成してもよいが、図３Ｂに示すように、バンド部材１１０の円弧方向１１７に沿って頂点１１３を越えてさらに胴体側領域１１２まで延在させてもよい。また図３Ｂでは、凸部１２２は、円弧方向１１７において胴体側領域１１２の途中まで延在させた状態を示すが、胴体側領域１１２の全域にわたり、つまり天板側領域１１１及び胴体側領域１１２の全域に渡って形成してもよい。 Further, the convex portion 122 may be formed only in the top plate side region 111 as shown in FIG. 3A, but as shown in FIG. 3B, the convex portion 122 is further formed beyond the apex 113 along the arc direction 117 of the band member 110. It may extend to the fuselage side region 112. Further, in FIG. 3B, the convex portion 122 shows a state of extending halfway of the body side region 112 in the arc direction 117, but covers the entire body side region 112, that is, the top plate side region 111 and the body side region 112. It may be formed over the entire area.

次に、変形誘発部１２０の他の形態として、図４に示すようなスリット付き凸部１２４が考えられる。
該スリット付き凸部１２４は、上述した凸部１２２に対して、周方向１１８において一部分断するように、スリット１２５、つまり切れ目、切り込みを加えたものである。該スリット１２５は、天板７の直径方向に沿って、また円弧方向１１７に沿って形成され、また周方向１１８において凸部１２２の中央部に形成される。スリット１２５の周方向１１８における長さＬ２は、一例として約０．５ｍｍであるが、これに限定されず、凸部１２２の長さＬ１までの範囲にて設定可能である。 Next, as another form of the deformation inducing portion 120, a convex portion 124 with a slit as shown in FIG. 4 can be considered.
The convex portion 124 with a slit has a slit 125, that is, a cut or a notch, added to the convex portion 122 described above so as to partially cut the convex portion 122 in the circumferential direction. The slit 125 is formed along the diameter direction of the top plate 7 and along the arc direction 117, and is formed at the center of the convex portion 122 in the circumferential direction 118. The length L2 of the slit 125 in the circumferential direction 118 is, for example, about 0.5 mm, but is not limited to this, and can be set within the range up to the length L1 of the convex portion 122.

スリット付き凸部１２４の配置場所は、上述の凸部１２２の場合に同じである。このとき、スリット１２５の配置範囲は、凸部１２２が天板側領域１１１のみに存在する場合には、凸部１２２と同じ又はその一部の範囲であり、凸部１２２がバンド部材１１０の円弧方向１１７に沿って天板側領域１１１及び胴体側領域１１２の両方に渡る形態では、スリット１２５が周方向１１８及び円弧方向１１７の両方においてバンド部材１１０を切断してしまわない範囲である。 The location of the convex portion 124 with a slit is the same as that of the convex portion 122 described above. At this time, the arrangement range of the slit 125 is the same as or a part of the convex portion 122 when the convex portion 122 exists only in the top plate side region 111, and the convex portion 122 is an arc of the band member 110. In the form extending along both the top plate side region 111 and the body side region 112 along the direction 117, the slit 125 is a range in which the band member 110 is not cut in both the circumferential direction 118 and the arc direction 117.

このようなスリット付き凸部１２４は、凸部１２２の場合と同様の作用効果、即ち、ドラム缶５０の内圧が高まった際に、スリット付き凸部１２４に対応した天板７の箇所における変形を容易にする、という効果を奏する。また、スリット１２５の存在により、凸部１２２のみを設けた場合に比べて、周方向１１８における凸部１２２の変位が容易になることから、天板７の意図的変形をより容易に生じさせることができる、という効果が得られる。よって、スリット付き凸部１２４は、耐内圧性能の更なる向上を図ることができる。 Such a convex portion 124 with a slit has the same effect as that of the convex portion 122, that is, when the internal pressure of the drum can 50 is increased, the top plate 7 corresponding to the convex portion 124 with a slit can be easily deformed. It has the effect of making it. Further, since the presence of the slit 125 facilitates the displacement of the convex portion 122 in the circumferential direction 118 as compared with the case where only the convex portion 122 is provided, intentional deformation of the top plate 7 can be caused more easily. The effect of being able to do is obtained. Therefore, the convex portion 124 with a slit can further improve the internal pressure resistance performance.

さらにまた、変形誘発部１２０のさらに別の形態として、図５Ａ及び図５Ｂに示すように、バンド部材１１０に凸部１２２を設けずに、スリット１２５のみを形成した形態が考えられる。尚、説明の便宜上、この形態を、スリット単独部１２６と記す。
このスリット単独部１２６におけるスリット１２５の円弧方向１１７における配置範囲も、上述の凸部１２２の場合に同じである。但し、スリット付き凸部１２４の場合と同様に、スリット１２５がバンド部材１１０の円弧方向１１７に沿って天板側領域１１１及び胴体側領域１１２の両方に渡る形態では、スリット１２５は、スリット１２５が周方向１１８及び円弧方向１１７の両方においてバンド部材１１０を切断してしまわない範囲である。
またスリット１２５の長さＬ２は、上述の０．５ｍｍから上述の長さＬ１の範囲（約０．２％から２．２％程度）に設定可能である。 Furthermore, as still another form of the deformation inducing portion 120, as shown in FIGS. 5A and 5B, a form in which only the slit 125 is formed without providing the convex portion 122 on the band member 110 can be considered. For convenience of explanation, this form is referred to as a slit single portion 126.
The arrangement range of the slit 125 in the slit single portion 126 in the arc direction 117 is also the same as in the case of the above-mentioned convex portion 122. However, as in the case of the convex portion 124 with the slit, in the form in which the slit 125 extends to both the top plate side region 111 and the body side region 112 along the arc direction 117 of the band member 110, the slit 125 has the slit 125. It is a range in which the band member 110 is not cut in both the circumferential direction 118 and the arc direction 117.
Further, the length L2 of the slit 125 can be set in the range from the above-mentioned 0.5 mm to the above-mentioned length L1 (about 0.2% to 2.2%).

このようなスリット単独部１２６の作用効果は、スリット付き凸部１２４の場合に同様であるが、スリット付き凸部１２４との比較において以下のような効果もある。
即ち、スリット付き凸部１２４及びスリット単独部１２６におけるスリット１２５は、バンド部材１１０を、例えば切削加工あるいは打ち抜き加工することで形成可能である。スリット単独部１２６は、スリット付き凸部１２４と比較して加工が容易であり、ドラム缶用締め輪１００の製造におけるコスト低減を図れるという利点がある。 Such an action effect of the slit single portion 126 is the same as in the case of the convex portion 124 with a slit, but there is also the following effect in comparison with the convex portion 124 with a slit.
That is, the slit 125 in the convex portion 124 with a slit and the single slit portion 126 can be formed by, for example, cutting or punching the band member 110. The slit single portion 126 is easier to process than the convex portion 124 with a slit, and has an advantage that the cost in manufacturing the tightening ring 100 for a drum can can be reduced.

また、スリット１２５は、上述の形成方法では、図５Ｃにスリット単独部１２６の例で示すように、バンド部材１１０の周方向１１８に沿って矩形形状になる。しかしながら、スリット１２５の形状は、スリット１２５の形成方法に依存し、図５Ｄに示すように、例えばＵ字型形状等であってもよく、その形状は問わない。
尚、図５Ｃ及び図５Ｄでは、その形状を明示するため、スリット１２５部分を誇張、拡大して表示している。 Further, in the above-mentioned forming method, the slit 125 has a rectangular shape along the circumferential direction 118 of the band member 110, as shown in the example of the slit single portion 126 in FIG. 5C. However, the shape of the slit 125 depends on the method of forming the slit 125, and as shown in FIG. 5D, it may be, for example, a U-shaped shape or the like, and the shape is not limited.
In FIGS. 5C and 5D, the slit 125 portion is exaggerated and enlarged in order to clearly show its shape.

以上説明した変形誘発部１２０は、バンド部材１１０の周方向１１８において、以下のように配置される。ここで変形誘発部１２０は、凸部１２２、スリット付き凸部１２４、及びスリット単独部１２６の少なくとも１種である。換言すると、周方向１１８においてバンド部材１１０の複数箇所に変形誘発部１２０を配置する場合、各変形誘発部１２０は、３種のうちのいずれか１種のみで構成してもよいし、異なる複数種類の変形誘発部１２０を組み合わせて構成してもよい。 The deformation inducing portion 120 described above is arranged as follows in the circumferential direction 118 of the band member 110. Here, the deformation inducing portion 120 is at least one of a convex portion 122, a convex portion 124 with a slit, and a slit single portion 126. In other words, when the deformation inducing portions 120 are arranged at a plurality of positions of the band member 110 in the circumferential direction 118, each deformation inducing portion 120 may be composed of only one of the three types, or a plurality of different types. A combination of different types of deformation-inducing units 120 may be configured.

既に説明したように、変形誘発部１２０は、ドラム缶５０における耐内圧性能向上のため、バンド部材１１０における不連続箇所であり応力集中箇所となる欠如部８とは異なる箇所にて、天板７に意図的変形を生じさせるためのものであることから、バンド部材１１０の周方向１１８において最低１箇所に形成可能である。その場所は、欠如部８の対向位置、つまり周方向１１８において欠如部８の中心位置を０度としたとき、周方向１１８において１８０度の位置が相当する。ここで、凸部１２２、スリット付き凸部１２４、及びスリット単独部１２６は、上述のように、いずれも周方向１１８において長さ（Ｌ１等）を有することから、凸部１２２、スリット付き凸部１２４、及びスリット単独部１２６の、周方向１１８における中心位置が基準位置となり、該基準位置が上記対向位置（１８０度位置）に対応する（下記の場合も同じ）。 As described above, the deformation inducing portion 120 is provided on the top plate 7 at a location different from the missing portion 8 which is a discontinuous portion and a stress concentration portion in the band member 110 in order to improve the internal pressure resistance performance of the drum can 50. Since it is intended to cause intentional deformation, it can be formed at at least one position in the circumferential direction 118 of the band member 110. The location corresponds to the opposite position of the missing portion 8, that is, the position of 180 degrees in the circumferential direction 118 when the center position of the missing portion 8 is 0 degrees in the circumferential direction 118. Here, since the convex portion 122, the convex portion 124 with a slit, and the single slit portion 126 all have a length (L1 or the like) in the circumferential direction 118 as described above, the convex portion 122 and the convex portion with a slit The center position of the 124 and the slit single portion 126 in the circumferential direction 118 becomes the reference position, and the reference position corresponds to the facing position (180 degree position) (the same applies to the following case).

また、図１に示すように、上記対向位置（１８０度位置）を間に配して、該対向位置の近辺で対向位置の両側の２箇所、つまり周方向１１８における例えば１３５度及び２２５度に、変形誘発部１２０を配置することもできる。 Further, as shown in FIG. 1, the facing positions (180 degree positions) are arranged in between, and at two locations on both sides of the facing position in the vicinity of the facing positions, that is, at, for example, 135 degrees and 225 degrees in the circumferential direction 118. , The deformation inducing unit 120 can also be arranged.

さらにまた、周方向１１８における４５度、１３５度、２２５度、及び３１５度の４箇所に、変形誘発部１２０を配置してもよい。 Furthermore, the deformation inducing portions 120 may be arranged at four locations of 45 degrees, 135 degrees, 225 degrees, and 315 degrees in the circumferential direction 118.

周方向１１８における変形誘発部１２０の配置位置の考え方として、４５度間隔もしくは２２．５度間隔、又はこれらを組み合わせた位置で対称的に配置することができる。ここで、対称的とは、天板７の中心点と、欠如部８の中心位置（上記０度の位置）とを通る直径軸に対する対称を意味する。
このとき、最大の配置数は、１５箇所であり、この場合、周方向１１８における２２．５度、４５度、６７．５度、９０度、１１２．５度、１３５度、１５７．５度、１８０度、２０２．５度、２２５度、２４７．５度、２７０度、２９２．５度、３１５度、及び３３７．５度に配置することができる。
また、１３箇所の場合には、４５度、６７．５度、９０度、１１２．５度、１３５度、１５７．５度、１８０度、２０２．５度、２２５度、２４７．５度、２７０度、２９２．５度、及び３１５度の位置に配置することができる。
また、９箇所の場合には、４５度、６７．５度、９０度、１３５度、１８０度、２２５度、２７０度、２９２．５度、及び３１５度の位置に配置することができる。
また、７箇所の場合には、４５度、９０度、１３５度、１８０度、２２５度、２７０度、及び３１５度の位置に配置することができる。 As a concept of the arrangement position of the deformation inducing portion 120 in the circumferential direction 118, it can be arranged symmetrically at an interval of 45 degrees, an interval of 22.5 degrees, or a position in which these are combined. Here, symmetry means symmetry with respect to the diameter axis passing through the center point of the top plate 7 and the center position of the missing portion 8 (the position at 0 degrees above).
At this time, the maximum number of arrangements is 15, and in this case, 22.5 degrees, 45 degrees, 67.5 degrees, 90 degrees, 112.5 degrees, 135 degrees, and 157.5 degrees in the circumferential direction 118. It can be arranged at 180 degrees, 202.5 degrees, 225 degrees, 247.5 degrees, 270 degrees, 292.5 degrees, 315 degrees, and 337.5 degrees.
In the case of 13 points, 45 degrees, 67.5 degrees, 90 degrees, 112.5 degrees, 135 degrees, 157.5 degrees, 180 degrees, 202.5 degrees, 225 degrees, 247.5 degrees, 270 degrees. It can be placed in degrees, 292.5 degrees, and 315 degrees.
Moreover, in the case of nine places, it can be arranged at the positions of 45 degrees, 67.5 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees, 292.5 degrees, and 315 degrees.
Moreover, in the case of seven places, it can be arranged at the positions of 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees, and 315 degrees.

出願人の実験等によれば、４箇所以上配置した場合、配置数が増えても耐圧強度の最大値は大きく向上しないことが確認されているが、各配置位置における耐内圧力のバラツキが減り、より安定的な耐内圧性能が得られるという効果がある。尚、配置数は、変形誘発部１２０の加工コストとの関係から決定することができる。 According to the applicant's experiments, it has been confirmed that the maximum value of the withstand voltage does not significantly improve even if the number of arrangements increases when four or more locations are arranged, but the variation in internal pressure resistance at each arrangement position is reduced. It has the effect of obtaining more stable internal pressure resistance. The number of arrangements can be determined from the relationship with the processing cost of the deformation inducing unit 120.

また、図１に示すように、天板７に設けられている大栓（注入口）７ｄ及び小栓（換気口）７ｅが設けられており、大栓７ｄ及び小栓７ｅ付近は、内圧上昇に際し、従来から天板７の変形が発生し易い箇所であることが確認されている。よって、大栓７ｄ及び小栓７ｅと、ドラム缶用締め輪１００におけるバンド部材１１０の欠如部８との位置関係について、欠如部８の配置位置は、大栓７ｄと小栓７ｅとの中間に配置するのが基本である。つまり、大栓７ｄ及び小栓７ｅを結ぶ直径軸に対して直交する直径軸上に欠如部８を配向するのが好ましい。
しかしながら、ドラム缶用締め輪１００は、顧客側で取り付けられる場合が多いことから、正確にこの位置に配置することはできず、ズレが生じる。
よって、バンド部材１１０に設ける変形誘発部１２０の設置数を多くすることで、上記ズレに対する影響を受け難くするという効果が得られる。 Further, as shown in FIG. 1, a large plug (injection port) 7d and a small plug (ventilation port) 7e provided on the top plate 7 are provided, and the internal pressure rises in the vicinity of the large plug 7d and the small plug 7e. At this time, it has been confirmed that the top plate 7 is likely to be deformed. Therefore, regarding the positional relationship between the large plug 7d and the small plug 7e and the missing part 8 of the band member 110 in the drum tightening ring 100, the position of the missing part 8 is arranged between the large plug 7d and the small plug 7e. It is basic to do. That is, it is preferable to orient the missing portion 8 on the diameter axis orthogonal to the diameter axis connecting the large plug 7d and the small plug 7e.
However, since the drum tightening ring 100 is often attached by the customer, it cannot be accurately arranged at this position, resulting in misalignment.
Therefore, by increasing the number of deformation inducing portions 120 provided on the band member 110, it is possible to obtain the effect of making it less susceptible to the above-mentioned deviation.

また、変形誘発部１２０を有するドラム缶用締め輪１００の場合、既述した出願人の特許である、耐内圧性能向上のため天板側に工夫を施したドラム缶用天板に比べると、バンド部材１１０に対する加工の方が容易であり、加工コストの低減を図れるという効果もある。 Further, in the case of the drum can tightening ring 100 having the deformation inducing portion 120, the band member is compared with the above-mentioned patent of the applicant for the drum can top plate in which the top plate side is devised to improve the internal pressure resistance performance. It is easier to process 110, and it also has the effect of reducing processing costs.

以上説明した、変形誘発部１２０を有するドラム缶用締め輪１００の作用について、説明する。
既に説明したように、缶胴体６の開口周縁部６ａに天板７を載せ、天板７の天板周縁部７ａと開口周縁部６ａとが締結するように、バンド部材１１０を取り付ける。そして第１取付部材２及び第２取付部材３にボルト４、ナット５を装着し、該ボルト４、ナット５を締め込み、ドラム缶用締め輪１００にてドラム缶５０を密閉する。 The operation of the tightening ring 100 for a drum can having the deformation inducing portion 120 described above will be described.
As described above, the top plate 7 is placed on the opening peripheral edge portion 6a of the can body 6, and the band member 110 is attached so that the top plate peripheral edge portion 7a and the opening peripheral edge portion 6a of the top plate 7 are fastened. Then, bolts 4 and nuts 5 are mounted on the first mounting member 2 and the second mounting member 3, the bolts 4 and nuts 5 are tightened, and the drum can 50 is sealed by the drum tightening ring 100.

このように密閉されたドラム缶５０に対して、出願人は、変形誘発部１２０を有するドラム缶用締め輪１００を使用した場合の耐内圧性能向上について、以下のような確認結果を得ている。
内圧上昇に伴う天板７の変形部付近における、天板７に設けられるパッキン７ｂと、缶胴体６の開口周縁部６ａとの接触面積を計算し、計算結果を用いて耐内圧性能の評価を行った。即ち、変形誘発部１２０である、凸部１２２、スリット付き凸部１２４、及びスリット単独部１２６のそれぞれについて、上述の長さＬ１、Ｌ２を変化させながら、接触面積と耐内圧力との関係評価を行った。
その結果の一例として、スリット付き凸部１２４及びスリット単独部１２６の変形誘発部１２０を有するドラム缶用締め輪１００における耐内圧性能の従来に対する向上が最も大きく、次いで凸部１２２（特にＬ１が１０ｍｍのもの）を有するものが良好であった。 For the drum can 50 sealed in this way, the applicant has obtained the following confirmation results regarding the improvement in the internal pressure resistance performance when the drum can tightening ring 100 having the deformation inducing portion 120 is used.
The contact area between the packing 7b provided on the top plate 7 and the opening peripheral edge 6a of the can body 6 in the vicinity of the deformed portion of the top plate 7 due to the increase in internal pressure is calculated, and the internal pressure resistance performance is evaluated using the calculation results. gone. That is, for each of the convex portion 122, the convex portion 124 with a slit, and the slit single portion 126, which are the deformation inducing portions 120, the relationship between the contact area and the internal pressure resistance is evaluated while changing the above-mentioned lengths L1 and L2. Was done.
As an example of the result, the improvement in the internal pressure resistance performance of the drum tightening ring 100 having the convex portion 124 with the slit and the deformation inducing portion 120 of the slit single portion 126 is the largest, followed by the convex portion 122 (particularly L1 is 10 mm). Those with (things) were good.

以上説明したように、本実施形態におけるドラム缶用締め輪１００によれば、バンド部材１１０における少なくとも天板側領域１１１に変形誘発部１２０を設けたことで、ドラム缶の内圧上昇により天板７が変形する場合でも、当該オープンドラム缶の耐内圧性能を従来に比べて向上させることができる。
さらにまた、ドラム缶用締め輪１００を使用することで、ドラム缶の少なくとも缶胴体６について、勿論、従来の１．２ｍｍ厚の鋼板も使用可能であるが、従来よりも薄い鋼板、例えば本実施形態のように１．０ｍｍ厚さの鋼板を使用して作製することが可能になる。更には、上記１．０ｍｍ未満、例えば０．９ｍｍ、０．８ｍｍ、等の厚さの鋼板にて缶胴体６を形成することも可能である。１．０ｍｍ以下の鋼板を使用することで、耐内圧性能の向上を図りながら、ドラム缶の軽量化及び価格低減をも図ることが可能になる。 As described above, according to the drum tightening ring 100 in the present embodiment, the deformation inducing portion 120 is provided at least in the top plate side region 111 of the band member 110, so that the top plate 7 is deformed due to the increase in the internal pressure of the drum can. Even in this case, the internal pressure resistance of the open drum can can be improved as compared with the conventional case.
Furthermore, by using the tightening ring 100 for a drum can, of course, a conventional 1.2 mm thick steel plate can be used for at least the can body 6 of the drum can, but a steel plate thinner than the conventional one, for example, the present embodiment. As described above, it becomes possible to manufacture using a steel plate having a thickness of 1.0 mm. Further, it is also possible to form the can body 6 from a steel plate having a thickness of less than 1.0 mm, for example, 0.9 mm, 0.8 mm, or the like. By using a steel plate of 1.0 mm or less, it is possible to reduce the weight and price of the drum can while improving the internal pressure resistance.

第２実施形態；
既に説明したように、上述した変形誘発部１２０は、従来から使用されているドラム缶用締め輪に対して変形誘発部１２０の加工を施したものである。一方、当該出願人は、同じくドラム缶の耐内圧性能向上を図る目的で、上述の欠如部８に関連した工夫を施した、図７に示すようなドラム缶用締め輪を提案し、既に特許を得ている（特許第５４０９０２３号）。
該特許第５４０９０２３号におけるドラム缶用締め輪（以下、「特許締め輪」と記す）は、以下のような構成を有するものである。 Second embodiment;
As described above, the above-mentioned deformation-inducing portion 120 is obtained by processing the deformation-inducing portion 120 on the conventionally used drum tightening ring. On the other hand, the applicant has also proposed a tightening ring for a drum can as shown in FIG. 7, which has been devised in relation to the above-mentioned missing portion 8, for the purpose of improving the internal pressure resistance performance of the drum can, and has already obtained a patent. (Patent No. 5409023).
The tightening ring for drums (hereinafter referred to as "patented tightening ring") in the patent No. 5409023 has the following configuration.

即ち、缶胴体に対して天板が着脱可能でありかつ耐内圧性能が要求されるオープンドラム缶に取り付けられ、付属の締付用部材による締め付け動作により上記缶胴体と上記天板とを締結するドラム缶用締め輪１０００（図７）であって、
周囲の一箇所を切り欠いた不連続な円形状にてなり、上記天板の周縁部及び上記缶胴体の開口周縁部にこれらを挟んで取り付けられ両方の上記周縁部を締結するバンド部材１１００と、
上記締付用部材を上記バンド部材に保持する部材であり、上記バンド部材の一端部１１２０の一端面より上記バンド部材の周方向に沿って上記バンド部材が露出した重なり領域１１４０を空けて上記バンド部材に固定される第１取付部材１２１０と、
上記第１取付部材と協働して上記締付用部材を上記バンド部材に保持する部材であり、上記バンド部材の他端部１１３０の他端面より上記周方向に突出して上記バンド部材に固定され、上記締めつけ動作によって上記バンド部材の上記重なり領域を覆う第２取付部材１２２０と、
を備え、
上記バンド部材を上記天板の上記周縁部及び上記缶胴体の上記周縁部に取り付け上記締付用部材を設けていない状態において、上記バンド部材の上記一端面と上記第２取付部材における先端面との間に隙間が形成される状態にて上記第２取付部材は上記バンド部材に固定され、
上記締付用部材を設け上記締め付け動作により上記第１取付部材と上記第２取付部材とが当接した状態において、上記バンド部材の上記一端面と上記他端面との隙間がゼロ以上で上記重なり領域の長さ未満となる隙間を有して、上記第１取付部材及び上記第２取付部材は、上記バンド部材に固定され、
上記周方向における上記第２取付部材の長さは、上記第１取付部材の長さに比べて大きく、
上記バンド部材の上記一端部は、テーパー状にて形成された、
という構成を有するドラム缶用締め輪である。 That is, a drum can that is attached to an open drum can whose top plate is removable from the can body and requires internal pressure resistance, and that fastens the can body and the top plate by a tightening operation by an attached tightening member. The tightening wheel 1000 (Fig. 7)
With a band member 1100 which has a discontinuous circular shape with one notch around it, is attached to the peripheral edge of the top plate and the opening peripheral edge of the can body, and fastens both peripheral edges. ,
A member that holds the tightening member to the band member, and the band is opened from an overlapping region 1140 in which the band member is exposed from one end surface of the one end portion 1120 of the band member along the circumferential direction of the band member. The first mounting member 1210 fixed to the member and
It is a member that holds the tightening member to the band member in cooperation with the first mounting member, and projects from the other end surface of the other end portion 1130 of the band member in the circumferential direction and is fixed to the band member. The second mounting member 1220 that covers the overlapping region of the band member by the tightening operation, and
Equipped with
In a state where the band member is attached to the peripheral edge portion of the top plate and the peripheral edge portion of the can body and the tightening member is not provided, the one end surface of the band member and the tip surface of the second attachment member The second mounting member is fixed to the band member in a state where a gap is formed between the two.
In a state where the tightening member is provided and the first mounting member and the second mounting member are in contact with each other by the tightening operation, the gap between the one end surface and the other end surface of the band member is zero or more and the above overlap. The first mounting member and the second mounting member are fixed to the band member with a gap that is less than the length of the region.
The length of the second mounting member in the circumferential direction is larger than the length of the first mounting member.
One end of the band member is formed in a tapered shape.
It is a tightening ring for drums having the above configuration.

上述した変形誘発部１２０は、このような上記特許締め輪に対しても、適用することができる。特許締め輪は、それ自体でも耐内圧性能向上が可能であることから、さらに変形誘発部１２０を設けることで、より効果的に耐内圧性能の向上を図ることが可能になる。また、変形誘発部１２０を設けた特許締め輪によっても、上述のように、従来よりも薄い鋼板の使用が可能になり、例えば上述のＵＮ規格適用のドラム缶であっても、さらに、上述の０．８ｍｍ未満の厚さの鋼板にて缶胴体を形成することが期待される。このように、変形誘発部１２０を設けた特許締め輪では、より効果的な耐内圧性能の向上が期待できることから、耐内圧性能の向上を図りながら、更なるドラム缶の軽量化及び価格低減をも図ることが可能になると期待される。 The above-mentioned deformation inducing portion 120 can also be applied to the above-mentioned patented tightening ring. Since the patented tightening wheel itself can improve the internal pressure resistance performance, it is possible to more effectively improve the internal pressure resistance performance by further providing the deformation inducing portion 120. Further, the patented tightening ring provided with the deformation inducing portion 120 also makes it possible to use a steel plate thinner than the conventional one as described above. For example, even in the case of the above-mentioned drum can to which the UN standard is applied, the above-mentioned 0 It is expected that the can body will be formed of a steel plate with a thickness of less than 8.8 mm. In this way, the patented tightening wheel provided with the deformation inducing portion 120 can be expected to improve the internal pressure resistance performance more effectively. Therefore, while improving the internal pressure resistance performance, the weight and price of the drum can can be further reduced. It is expected that it will be possible to plan.

本発明は、オープンドラム缶の缶胴体に天板を締結するドラム缶用締め輪、及び該ドラム缶用締め輪を取り付けたドラム缶に適用可能である。 The present invention is applicable to a drum can tightening ring in which a top plate is fastened to the can body of an open drum can, and a drum can to which the drum can tightening ring is attached.

２、３…取付部材、４…ボルト、５…ナット、６…缶胴体、６ａ…開口周縁部、
７…天板、７ａ…天板周縁部、８…欠如部、５０…オープンドラム缶、
１００…ドラム缶用締め輪、１１０…バンド部材、１１１…天板側領域、
１１２…胴体側領域、１２０…変形誘発部、１２２…凸部、
１２４…スリット付き凸部、１２５…スリット、１２６…スリット単独部。 2, 3 ... Mounting member, 4 ... Bolt, 5 ... Nut, 6 ... Can body, 6a ... Opening peripheral edge,
7 ... Top plate, 7a ... Top plate peripheral part, 8 ... Missing part, 50 ... Open drum can,
100 ... Drum tightening ring, 110 ... Band member, 111 ... Top plate side area,
112 ... Body side region, 120 ... Deformation inducing part, 122 ... Convex part,
124 ... Convex part with slit, 125 ... Slit, 126 ... Slit single part.

Claims (12)

缶胴体（６）に対して天板（７）が着脱可能でありかつ耐内圧性能が要求されるオープンドラム缶（５０）に取り付けられ、締結用部材（４，５）による締め付け動作により上記缶胴体と上記天板とを締結するドラム缶用締め輪（１００）であって、
円周の一箇所を完全に取り除いた欠如部（８）を有する不連続な円形状にてなり、上記天板の周縁部（７ａ）及び上記缶胴体の開口周縁部（６ａ）を挟んで取り付けられ天板及び缶胴体の両方の周縁部を締結するバンド部材（１１０）と、
上記締結用部材を上記バンド部材に保持する部材であり、上記欠如部における上記バンド部材の一端部（１ａ）にて上記バンド部材に固定される第１取付部材（２）と、
上記締結用部材を上記バンド部材に保持する部材であり、上記欠如部における上記バンド部材の他端部（１ｂ）にて上記バンド部材に固定される第２取付部材（３）と、を備え、
上記バンド部材は、取付状態において、天板周縁部に接する天板側領域（１１１）及び上記開口周縁部に接する胴体側領域（１１２）を有し、少なくとも上記天板側領域は、当該バンド部材の周方向（１１８）における所望箇所に変形誘発部（１２０）を有し、該変形誘発部は、密閉された当該ドラム缶の内圧上昇に起因して生じる上記天板の変形を当該天板における上記所望箇所にて意図的に誘発させる部分である、
ことを特徴とするドラム缶用締め輪。 The top plate (7) is removable from the can body (6) and is attached to an open drum can (50) that requires internal pressure resistance, and the can body is tightened by the fastening members (4, 5). A drum can tightening ring (100) for fastening the top plate to the top plate.
It has a discontinuous circular shape with a missing portion (8) from which one part of the circumference is completely removed, and is attached by sandwiching the peripheral edge portion (7a) of the top plate and the opening peripheral edge portion (6a) of the can body. A band member (110) that fastens the peripheral edges of both the top plate and the can body,
A first mounting member (2) that is a member that holds the fastening member to the band member and is fixed to the band member at one end portion (1a) of the band member in the missing portion.
A member that holds the fastening member to the band member, and includes a second mounting member (3) that is fixed to the band member at the other end (1b) of the band member in the missing portion.
The band member has a top plate side region (111) in contact with the top plate peripheral edge portion and a body side region (112) in contact with the opening peripheral edge portion in the mounted state, and at least the top plate side region is the band member. The deformation inducing portion (120) is provided at a desired position in the circumferential direction (118), and the deformation inducing portion causes the deformation of the top plate caused by the increase in the internal pressure of the sealed drum can to be caused by the deformation of the top plate. The part that is intentionally induced at the desired location,
A tightening ring for drums that is characterized by this. 上記バンド部材は、Ｕ字又はＶ字形の縦断面を有し、上記天板側領域と上記胴体側領域との接合点で上記縦断面における頂点（１１３）を形成している、請求項１に記載のドラム缶用締め輪。 The band member has a U-shaped or V-shaped vertical cross section, and forms an apex (113) in the vertical cross section at a joint point between the top plate side region and the body side region, according to claim 1. The above-mentioned tightening ring for drums. 上記変形誘発部は、上記天板側領域において上記頂点とは反対側に位置する始点（１１１ａ）から当該天板側領域のほぼ２／３までの範囲に、又は、上記始点から上記頂点を通り上記胴体側領域の一部までの範囲に延在する、請求項２に記載のドラム缶用締め輪。 The deformation-inducing portion extends from a start point (111a) located on the opposite side of the apex to approximately two-thirds of the top plate side region in the top plate side region, or passes through the apex from the start point. The tightening ring for a drum can according to claim 2, which extends to a part of the body side region. 上記変形誘発部は、取付状態の上記バンド部材において当該バンド部材を反天板側（７ｃ）へ変形させた部分で上記天板側領域と上記天板周縁部とが非接触となる凸部（１２２）である、請求項１から３のいずれかに記載のドラム缶用締め輪。 The deformation inducing portion is a convex portion (a convex portion in which the top plate side region and the top plate peripheral edge portion are not in contact with each other at a portion where the band member is deformed to the anti-top plate side (7c) in the mounted band member. 122) The tightening ring for a drum can according to any one of claims 1 to 3. 上記凸部における、上記バンド部材の周方向における長さであって上記天板側領域と上記天板周縁部とが非接触な長さは、天板周囲長さの０．２％から２．２％の範囲にある、請求項４に記載のドラム缶用締め輪。 The length of the convex portion in the circumferential direction in which the top plate side region and the top plate peripheral edge are not in contact is 0.2% to 2. of the top plate peripheral length. The tightening ring for a drum can according to claim 4, which is in the range of 2%. 上記変形誘発部は、上記天板側領域のみにおいて、又は上記天板側領域から上記胴体側領域の一部において、天板の直径方向に沿って形成したスリット（１２５）である、請求項１から５のいずれかに記載のドラム缶用締め輪。 The deformation inducing portion is a slit (125) formed along the diameter direction of the top plate only in the top plate side region or in a part of the body side region from the top plate side region, claim 1. The tightening ring for a drum can according to any one of 5 to 5. 上記変形誘発部は、上記バンド部材の周方向において、上記欠如部の対向位置又は該対向位置の両側位置に存在する、請求項１から６のいずれかに記載のドラム缶用締め輪。 The tightening ring for a drum can according to any one of claims 1 to 6, wherein the deformation-inducing portion exists at a position facing the missing portion or at positions on both sides of the facing position in the circumferential direction of the band member. 上記変形誘発部は、上記バンド部材の周方向において、上記欠如部を０度として４５度間隔もしくは２２．５度間隔、又はこれらを組み合わせた位置に配置される、請求項１から６のいずれかに記載のドラム缶用締め輪。 Any of claims 1 to 6, wherein the deformation-inducing portion is arranged at intervals of 45 degrees or 22.5 degrees, or a combination thereof, with the missing portion as 0 degrees in the circumferential direction of the band member. Tightening wheel for drums described in. 上記変形誘発部は、上記バンド部材の周方向において２から１５箇所に配置される、請求項８に記載のドラム缶用締め輪。 The tightening ring for a drum can according to claim 8, wherein the deformation inducing portion is arranged at 2 to 15 positions in the circumferential direction of the band member. 缶胴体に対して天板が着脱可能でありかつ耐内圧性能が要求されるオープンドラム缶に取り付けられ、付属の締付用部材による締め付け動作により上記缶胴体と上記天板とを締結するドラム缶用締め輪であって、
周囲の一箇所を切り欠いた不連続な円形状にてなり、上記天板の周縁部及び上記缶胴体の開口周縁部にこれらを挟んで取り付けられ両方の上記周縁部を締結するバンド部材と、
上記締付用部材を上記バンド部材に保持する部材であり、上記バンド部材の一端部の一端面より上記バンド部材の周方向に沿って上記バンド部材が露出した重なり領域を空けて上記バンド部材に固定される第１取付部材と、
上記第１取付部材と協働して上記締付用部材を上記バンド部材に保持する部材であり、上記バンド部材の他端部の他端面より上記周方向に突出して上記バンド部材に固定され、上記締めつけ動作によって上記バンド部材の上記重なり領域を覆う第２取付部材と、
を備え、
上記バンド部材を上記天板の上記周縁部及び上記缶胴体の上記周縁部に取り付け上記締付用部材を設けていない状態において、上記バンド部材の上記一端面と上記第２取付部材における先端面との間に隙間が形成される状態にて上記第２取付部材は上記バンド部材に固定され、
上記締付用部材を設け上記締め付け動作により上記第１取付部材と上記第２取付部材とが当接した状態において、上記バンド部材の上記一端面と上記他端面との隙間がゼロ以上で上記重なり領域の長さ未満となる隙間を有して、上記第１取付部材及び上記第２取付部材は、上記バンド部材に固定され、
上記周方向における上記第２取付部材の長さは、上記第１取付部材の長さに比べて大きく、
上記バンド部材の上記一端部は、テーパー状にて形成されており、
上記バンド部材は、取付状態において、天板周縁部に接する天板側領域（１１１）及び上記開口周縁部に接する胴体側領域（１１２）を有し、少なくとも上記天板側領域は、当該バンド部材の周方向（１１８）における所望箇所に変形誘発部（１２０）を有し、該変形誘発部は、密閉された当該ドラム缶の内圧上昇に起因して生じる上記天板の変形を当該天板における上記所望箇所にて意図的に誘発させる部分である、
ことを特徴とするドラム缶用締め輪。 Tightening for drum cans, which is attached to an open drum can whose top plate is removable from the can body and requires internal pressure resistance, and which fastens the can body and the top plate by the tightening operation by the attached tightening member. It ’s a ring,
A band member that has a discontinuous circular shape with one notch around it, is attached to the peripheral edge of the top plate and the opening peripheral edge of the can body, and fastens both peripheral edges.
A member that holds the tightening member to the band member, and the band member has an overlapping region where the band member is exposed from one end surface of one end of the band member along the circumferential direction of the band member. The first mounting member to be fixed and
It is a member that holds the tightening member to the band member in cooperation with the first mounting member, and projects from the other end surface of the other end of the band member in the circumferential direction and is fixed to the band member. A second mounting member that covers the overlapping region of the band member by the tightening operation, and
Equipped with
In a state where the band member is attached to the peripheral edge portion of the top plate and the peripheral edge portion of the can body and the tightening member is not provided, the one end surface of the band member and the tip surface of the second attachment member The second mounting member is fixed to the band member in a state where a gap is formed between the two.
In a state where the tightening member is provided and the first mounting member and the second mounting member are in contact with each other by the tightening operation, the gap between the one end surface and the other end surface of the band member is zero or more and the above overlap. The first mounting member and the second mounting member are fixed to the band member with a gap that is less than the length of the region.
The length of the second mounting member in the circumferential direction is larger than the length of the first mounting member.
The one end portion of the band member is formed in a tapered shape.
The band member has a top plate side region (111) in contact with the top plate peripheral edge portion and a body side region (112) in contact with the opening peripheral edge portion in the mounted state, and at least the top plate side region is the band member. The deformation inducing portion (120) is provided at a desired position in the circumferential direction (118), and the deformation inducing portion causes the deformation of the top plate caused by the increase in the internal pressure of the sealed drum can to be caused by the deformation of the top plate. The part that is intentionally induced at the desired location,
A tightening ring for drums that is characterized by this. 上記缶胴体は、０．８ｍｍと１．０ｍｍとの間の範囲にある板厚さを有する、請求項１から１０のいずれかに記載のドラム缶用締め輪。 The tightening ring for a drum can according to any one of claims 1 to 10, wherein the can body has a plate thickness in the range of 0.8 mm and 1.0 mm. 缶胴体（６）と、
上記缶胴体に対して着脱可能である天板（７）と、を有し、耐内圧性能が要求されるオープンドラム缶であって、
付属の締結用部材による締め付け動作により上記缶胴体と上記天板とを締結する、請求項１から１１のいずれかに記載のドラム缶用締め輪（１００）をさらに備えたことを特徴とするオープンドラム缶。 Can body (6) and
An open drum can that has a top plate (7) that can be attached to and detached from the can body and is required to have internal pressure resistance.
An open drum can further provided with a drum tightening ring (100) according to any one of claims 1 to 11, which fastens the can body and the top plate by a tightening operation by an attached fastening member. ..
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US6435576B1 (en) * 1999-07-19 2002-08-20 Lenix Fred Kusta Closure ring assembly for an open-head drum
JP2008265869A (en) * 2007-03-29 2008-11-06 Showa Aluminum Kan Kk Can lid
JP2011098769A (en) * 2009-11-09 2011-05-19 Nittetsu Drum Kk Open type drum can for liquid dangerous article
JP4825881B2 (en) * 2009-01-27 2011-11-30 Ｊｆｅコンテイナー株式会社 Drum can top plate and drum can
JP2013144558A (en) * 2012-01-13 2013-07-25 Nippon Steel & Sumikin Drum Co Ltd Open-type drum
JP5409023B2 (en) * 2009-01-14 2014-02-05 Ｊｆｅコンテイナー株式会社 Drum ring and drum
JP2018030636A (en) * 2016-08-26 2018-03-01 日鉄住金ドラム株式会社 Open type drum

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6084774A (en) * 1983-10-14 1985-05-14 Hitachi Ltd Fuel cell
JP2000226063A (en) * 1999-02-01 2000-08-15 Giken Seisakusho Co Ltd Tying device and tying method for line shaped material
US6435576B1 (en) * 1999-07-19 2002-08-20 Lenix Fred Kusta Closure ring assembly for an open-head drum
JP2008265869A (en) * 2007-03-29 2008-11-06 Showa Aluminum Kan Kk Can lid
JP5409023B2 (en) * 2009-01-14 2014-02-05 Ｊｆｅコンテイナー株式会社 Drum ring and drum
JP4825881B2 (en) * 2009-01-27 2011-11-30 Ｊｆｅコンテイナー株式会社 Drum can top plate and drum can
JP2011098769A (en) * 2009-11-09 2011-05-19 Nittetsu Drum Kk Open type drum can for liquid dangerous article
JP2013144558A (en) * 2012-01-13 2013-07-25 Nippon Steel & Sumikin Drum Co Ltd Open-type drum
JP2018030636A (en) * 2016-08-26 2018-03-01 日鉄住金ドラム株式会社 Open type drum

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