JP4466944B2

JP4466944B2 - Easy-to-open can lid

Info

Publication number: JP4466944B2
Application number: JP2003311159A
Authority: JP
Inventors: 山本　　明; 聡田村
Original assignee: Daiwa Can Co Ltd
Current assignee: Daiwa Can Co Ltd
Priority date: 2003-09-03
Filing date: 2003-09-03
Publication date: 2010-05-26
Anticipated expiration: 2023-09-03
Also published as: JP2005075448A

Description

本発明は、飲料缶等の缶容器の天板側の端壁として缶胴に巻締固着される缶蓋で、缶蓋のパネル部にリベット止めされたタブの一端側を指掛け部として引き上げることで開口操作を行なうような開口容易缶蓋に関し、特に、缶内圧が高い陽圧缶で使用するのに好適な開口容易缶蓋に関する。 The present invention is a can lid that is fastened and fastened to a can body as an end wall on the top plate side of a can container such as a beverage can, and pulls up one end side of a tab riveted to the panel portion of the can lid as a finger-hanging portion. In particular, the present invention relates to an easy-to-open can lid suitable for use in a positive pressure can having a high internal pressure.

缶容器の天板側の端壁として缶胴に巻締固着される開口容易缶蓋（イージーオープンエンド）として、従来から、飲料用の缶容器では、缶蓋のパネル部にリベット止めされたタブの一端側を指掛け部として引き上げることにより、缶蓋のパネル部のスコア線で囲まれた開口片の部分を缶内に押し下げて、タブや開口片を缶蓋から切り離すことなく、缶蓋のパネル部の一部分を飲み口として部分的に開口するようなステイオンタブ方式の缶蓋が多く使用されており、一方、プリンやゼリーや固形物を内容物とする缶容器では、缶蓋のパネル部にリベット止めされたタブの一端側を指掛け部として引き上げることにより、缶蓋のスコア線で囲まれたパネル部の大部分を開口片としてタブと共に缶蓋から切り離すことで、缶蓋のパネル部を全面的に開口するようなフルオープンタイプの缶蓋が多く使用されている。 As an easy-to-open can lid (easy open end) that is fastened and fastened to the can body as an end wall on the top plate side of the can container, a tab that has been riveted to the panel portion of the can lid has traditionally been used for beverage can containers By pulling up one end side of the can as a finger-hanging part, the part of the opening piece surrounded by the score line of the panel part of the can lid is pushed down into the can, and the panel of the can lid can be removed without separating the tab or opening piece from the can lid. Steion tab-type can lids that partially open with a part of the mouth as a drinking mouth are often used. On the other hand, in can containers containing pudding, jelly, or solid matter, the panel portion of the can lid By pulling up one end side of the tab riveted to the finger as a finger-hanging part, the panel part of the can lid is separated from the can lid together with the tab as an opening piece by separating most of the panel part surrounded by the score line of the can lid. Totally Full-open type of can lid, such as the mouth is often used.

また、ステイオンタブ方式の開口容易缶蓋において、缶蓋のパネル部にリベット止めされたタブの一端側を指掛け部として引き上げる際に、指掛け部に指が掛かり易くするために、タブの指掛け部を下側から支える突起を缶蓋のパネル部に形成すると共に、タブに曲げ弾性を生じさせる打刻凹条を形成することで、タブの指掛け部を浮き上がらせてタブの指掛け部と缶蓋のパネル部との間の隙間を大きくするということが下記の特許文献により従来公知となっている。
実公平８−６７４６号公報 In addition, in the easy opening can lid of the steion tab method, when the one end side of the tab riveted to the panel portion of the can lid is pulled up as a finger hanging portion, the finger holding portion of the tab The tabs on the can lid are formed with protrusions that support the tab from the lower side, and the embossed recesses that generate bending elasticity on the tabs are lifted so that the tab finger rests rise and the tab finger rests and the can lid Increasing the gap between the panel and the panel portion is conventionally known from the following patent document.
No. 8-6746

ところで、上記のようにタブの指掛け部を缶蓋のパネル部から浮き上がらせた従来公知の開口容易缶蓋では、タブを高く浮き上がらせる程それだけタブに指を掛け易くなるものの、缶蓋の単体としてパネル部からタブを予め浮き上がらせていることから、缶蓋の単体同士を重ね合わせた状態で巻締装置（シーマー）に向けて搬送するような際に、タブの指掛け部がその上に重なる他の缶蓋の内面と擦れ合うことで、他の缶蓋の内面を傷付けてしまうような虞があると共に、缶蓋の内面とその下に重なる他の缶蓋のタブとが接触して積み重ね状態が不安定となり、缶蓋の積み重ね性（スタック性）が悪くなることで、巻締装置での缶蓋の切り出しにトラブルが生じて、巻締装置に対して缶蓋を適正な状態で供給できないような虞もある。特に、内容物が炭酸飲料やビール等の発泡性飲料である缶内圧が陽圧の飲料缶の場合には、胴部と底部が一体成形された缶本体に内容物を充填した後で缶蓋を巻締め固着していることから、そのような巻締装置でのトラブルの発生は、単に缶容器のロスとなるだけでなく、内容物のロスにもつながる大きな問題である。 By the way, in the conventionally known easy opening can lid in which the tab-fitting part of the tab is lifted from the panel part of the can lid as described above, the tab is easily lifted so that the tab is easily lifted. Since the tabs are lifted from the panel in advance, when the can lids are transported toward the tightening device (seamer) in a state where the can lids are stacked together, There is a risk that the inner surface of the other can lid may be damaged by rubbing against the inner surface of the other can lid, and the inner surface of the can lid and the tab of the other can lid that overlaps with the inner surface of the can lid may come into contact with each other. It becomes unstable and the stackability (stackability) of the can lid deteriorates, causing troubles in cutting out the can lid with the winding device, so that the can lid cannot be supplied to the winding device in an appropriate state. There is also a fear. In particular, in the case of a beverage can with a positive pressure inside the can whose contents are sparkling beverages such as carbonated beverages and beer, the can lid after the contents are filled into the can body integrally formed with the body and the bottom Therefore, the occurrence of troubles in such a tightening device is not only a loss of the can container but also a major problem that leads to a loss of the contents.

本発明は、上記のような問題の解消を課題とするものであり、具体的には、陽圧缶で使用する開口容易缶蓋について、缶蓋の単体同士を重ね合わせた際には、タブにより他の缶蓋の内面を傷付けることなく、良好な積み重ね性（スタック性）が得られると共に、缶容器として使用する際には、開口操作のためのタブに指が掛かり易くすることを課題とするものである。 The present invention is intended to solve the above-described problems. Specifically, for easy opening can lids used in positive pressure cans, when the can lids are overlapped with each other, a tab is formed. With this, good stackability (stackability) can be obtained without damaging the inner surface of other can lids, and when used as a can container, it is easy to put a finger on the tab for opening operation. To do.

本発明は、上記のような課題を解決するために、缶蓋のパネル部に、開口片を画成するためのスコア線が刻設され、且つ、開口操作のためのタブがリベット止めされていて、リベットから離れたタブの一端側を指掛け部として引き上げることで開口操作を行なうような開口容易缶蓋において、缶蓋のパネル部には、タブの指掛け部の基部付近の下方に、タブ回り止め用となる左右一対の突起部を、タブの裏側の窪みに嵌まり込むように形成すると共に、この突起部のそれぞれに対して、その周囲を囲むように、環状の膨出容易部を形成して、この環状の膨出容易部を、通常の缶詰の製造によって発生する缶内圧により缶外方に突出する変形容易部とすることで、その突出変形によりタブの指掛け部を浮き上がらせるように形成することを特徴とするものである。 In order to solve the above-mentioned problems, the present invention has a score line for defining an opening piece formed in the panel portion of the can lid, and a tab for opening operation is riveted. In the easy-to-open can lid where the opening operation is performed by pulling up one end side of the tab away from the rivet as a finger-hanging portion, the panel portion of the can-lid has a tab around the bottom of the tab-hooking base. A pair of left and right projections for stopping are formed so as to fit into the recesses on the back side of the tab, and an annular bulging easy part is formed so as to surround each of the projections. Then, by making this annular bulging easy part into an easily deformable part that protrudes outward from the can due to the internal pressure of the can generated by normal canning , the protruding part of the tab can be lifted by the projecting deformation. Features forming Is intended to.

上記のような本発明の開口容易缶蓋によれば、缶蓋の単体においてタブの指掛け部を予めパネル部から浮き上がらないようにしておくことで、缶蓋の単体同士を重ね合わせた際には、タブにより他の缶蓋の内面を傷付けることなく、また、良好な状態で缶蓋同士を積み重ねることができて、積み重ね性（スタック性）の悪化に起因する巻締装置でのトラブルの発生を防止することができる。また、缶蓋を陽圧缶に巻締め固着した後では、缶内圧により変形容易部が缶外方に突出変形してタブの指掛け部を浮き上がらせることで、タブの指掛け部に容易に指を掛けることができて、缶容器の開口操作を容易に行なうことができる。 According to the easy opening can lid of the present invention as described above, when the tabs of the can lids are overlapped with each other by keeping the finger-hook portion of the tab from floating in advance from the panel portion. The tabs can be stacked in good condition without damaging the inner surface of other can lids with tabs, and troubles can occur in the winding device due to deterioration of stackability (stackability). Can be prevented. In addition, after the can lid is wrapped and fixed to the positive pressure can, the easily deformable portion protrudes outwardly from the can due to the internal pressure of the can and lifts up the finger hook portion of the tab, so that the finger hook portion of the tab can be easily moved. It can be hung and the opening operation of a can container can be performed easily.

缶蓋の単体同士を重ね合わせた際には、タブを他の缶蓋の内面を接触させることなく、且つ、陽圧缶の缶蓋として使用する際には、タブの指掛け部を缶蓋のパネル部から浮き上がらせて指に掛かり易くするという目的を、最良の形態として以下の実施例に具体的に示すように、缶蓋のパネル部には、タブの指掛け部の基部付近の下方に、タブ回り止め用となる左右一対の突起部を、タブの裏側の窪みに嵌まり込むように形成すると共に、この突起部のそれぞれに対して、その周囲を囲むように環状の膨出容易部を形成して、この環状の膨出容易部を、通常の缶詰の製造によって発生する缶内圧により缶外方に突出する変形容易部とすることで、その突出変形によりタブの指掛け部を浮き上がらせるように形成するということで実現した。 When the can lids are overlapped with each other, the tabs are not brought into contact with the inner surface of the other can lids. As shown in the following examples as the best mode, the panel lid portion of the can lid is positioned below the base of the finger-hanging portion of the tab. A pair of left and right protrusions for tab rotation prevention are formed so as to fit into the recesses on the back side of the tab, and an annular bulging easy part is formed so as to surround the periphery of each of the protrusions. formed by the bulging easy portion of the annular, the cans pressure generated by conventional canning manufacturing with easily deformable portion projecting to the can outside, so as to float the finger hook tabs by the protruding deformation Realized by forming in.

本実施例は、炭酸飲料やビール等の発泡性飲料を内容物とする陽圧の飲料缶に使用するステイオンタブ方式の開口容易缶蓋によるものであって、そのようなステイオンタブ方式の開口容易缶蓋では、従来から一般的に、図１（Ａ），（Ｂ）に示すように、パネル部２とカウンターシンク部３とフランジ部４とが一体的にプレス成形されている本体部分に対して、それとは別体に形成された開口操作用のタブ６が、略円板状のパネル部２の略中央に一体的に形成されたリベット部５でのリベット止めによって固着されている。なお、図示していないが、缶胴との巻締固着部分となるフランジ部４の裏面側には、有機高分子製のシール剤が塗布されて付着される。 The present embodiment is based on the easy opening lid of the steion tab method used for a positive pressure beverage can containing sparkling beverages such as carbonated beverages and beer. In an easy-to-open can lid, as shown in FIGS. 1 (A) and 1 (B), a main body portion in which a panel portion 2, a counter sink portion 3, and a flange portion 4 are integrally press-molded. On the other hand, a tab 6 for opening operation formed separately from the rivet is fixed by riveting at a rivet portion 5 integrally formed at a substantially center of the substantially disk-shaped panel portion 2. . Although not shown, an organic polymer sealing agent is applied and adhered to the back surface side of the flange portion 4 which is a portion to be fastened to the can body.

そして、缶蓋１の略円板状のパネル部２には、その一部分を飲み口として部分的に開口するように、破断可能なスコア線７で囲まれた部分が開口片８として画成されている。すなわち、開口部の形状に沿って始端から終端に連続するスコア線７（なお、開口時に破断する外側の主スコア線７に対して、破断しない内側の副スコア線が二重線の状態で設けられている）が、その一部分がリベット部５に近接して沿うようにパネル部２に刻設されていて、スコア線７（開口時に破断する主スコア線）によって囲まれた領域が、開口時に缶内に押し下げられる開口片８の部分となり、スコア線７の両端部の間の部分が、開口時にパネル部２と開口片８とを繋ぐヒンジ部分となる。 In the substantially disc-shaped panel portion 2 of the can lid 1, a portion surrounded by a breakable score line 7 is defined as an opening piece 8 so that a portion thereof is partially opened as a drinking mouth. ing. That is, the score line 7 that continues from the start end to the end along the shape of the opening (in addition to the outer main score line 7 that breaks when opening, the inner sub-score line that does not break is provided in a double line state. However, the area surrounded by the score line 7 (the main score line that breaks when opening) is partly engraved in the panel portion 2 so as to be close to the rivet portion 5, It becomes the part of the opening piece 8 pushed down in a can, and the part between the both ends of the score line 7 becomes a hinge part which connects the panel part 2 and the opening piece 8 at the time of opening.

また、スコア線７の両端部の間をヒンジ部分として残すようにパネル部２に部分的に形成されている開口片８に対して、開口操作用のタブ６が、その一端側が指掛け部６ａとしてリベット部５を挟んで開口片８とは反対側に位置し、その他端側が押下げ部６ｂとして開口片８の上方に位置するように、開口片８の領域外で、パネル部２の略中央に形成されたリベット部５により、パネル部２にリベット止めで固着されている。なお、タブ６では、全体の外周縁や指掛け部６ａの内周縁の部分で金属板が下面側に折り曲げられていて、それらの部分では剛性が極めて高いのに対して、リベット部５によりリベット止めされる部分６ｃの近傍では、一枚の金属板だけで変形し易いようになっている。 In addition, the opening operation tab 6 has an opening operation tab 6 as a finger-hanging portion 6a with respect to the opening piece 8 partially formed in the panel portion 2 so as to leave the space between both ends of the score line 7 as a hinge portion. Outside the region of the opening piece 8 and at the approximate center of the panel portion 2 so that the other end side is located above the opening piece 8 as a pressing portion 6b with the rivet portion 5 interposed therebetween. The rivet portion 5 is fixed to the panel portion 2 by rivets. In the tab 6, the metal plate is bent on the lower surface side at the entire outer peripheral edge and the inner peripheral edge of the finger-hanging portion 6a. In the vicinity of the portion 6c to be formed, it is easy to deform with only one metal plate.

さらに、缶蓋１のパネル部２には、タブ６と開口片８の領域を内包するように、傾斜面１１と該傾斜面１１で囲まれた底面１２とを有する浅い凹部１０が形成されており、それによって、缶蓋上面でのタブ６の突出の度合いが低く抑えられると共に、パネル部２の全体的な剛性が高められている。そして、パネル部２に形成された凹部１０の底面１２には、開口片８の部分の剛性を高めるための補強突起１３が形成されており、また、タブ６の指掛け部６ａの末端付近の下方に、指掛け部６ａを摘み易くするための指入れ凹部１４が、傾斜面１１の一部分と連なった状態で、凹部１０の底面１２から更に下方に凹むように形成されていると共に、リベット部５を回動支点としてタブ６が横ずれ回動するのを防止するタブ回り止め用の左右一対の突起部１５が、指掛け部６ａの基部付近の下方でタブ６の裏側に嵌まり込むように形成されている。 Furthermore, a shallow recess 10 having an inclined surface 11 and a bottom surface 12 surrounded by the inclined surface 11 is formed in the panel portion 2 of the can lid 1 so as to enclose the region of the tab 6 and the opening piece 8. Thus, the degree of protrusion of the tab 6 on the upper surface of the can lid is suppressed to a low level, and the overall rigidity of the panel portion 2 is enhanced. A reinforcing projection 13 is formed on the bottom surface 12 of the recess 10 formed in the panel portion 2 to increase the rigidity of the opening piece 8, and the lower portion of the tab 6 near the end of the finger-hanging portion 6 a. In addition, a finger insertion recess 14 for facilitating picking the finger-hanging portion 6a is formed so as to be recessed further downward from the bottom surface 12 of the recess 10 in a state where it is continuous with a part of the inclined surface 11, and the rivet portion 5 is A pair of left and right projections 15 for preventing the tab 6 from rotating laterally as a pivotal fulcrum is formed so as to be fitted to the back side of the tab 6 below the base of the finger-hanging portion 6a. Yes.

ところで、上記のような構造を備えた従来のステイオンタブ方式の開口容易缶蓋に対して、本発明の開口容易缶蓋では、タブ６の指掛け部６ａ付近で、缶蓋のパネル部２に、通常の缶詰の製造によって発生する５０ｋＰａ〜３００ｋＰａ程度の缶内圧により缶外方に突出する変形容易部が、その突出変形によりタブ６の指掛け部６ａを浮き上がらせるように形成されている。 By the way, in contrast to the conventional easy-open can lid of the conventional steion tab type having the above-described structure, the easy-open can lid of the present invention is arranged near the panel portion 2 of the can lid in the vicinity of the finger-hanging portion 6a of the tab 6. An easily deformable portion that protrudes outward from the can by an internal pressure of about 50 kPa to 300 kPa, which is generated by normal can manufacturing, is formed so that the finger hook portion 6a of the tab 6 is lifted by the protruding deformation.

すなわち、本実施例では、図２に示すように、缶蓋のパネル部２（パネル部２に形成された凹部１０の底面１２）において、タブ６の指掛け部６ａの基部付近の下方に形成されたタブ回り止め用の突起部１５に対し、図３（Ａ）に示すように、タブ６の裏側の窪みに嵌まっている突起部１５の周囲で、タブ６の下端部と接触する部分の外側に、変形容易部として環状の膨出容易部１６を形成しており、それによって、缶内圧が缶蓋のパネル部２に裏側から作用したときに、図３（Ｂ）に示すように、環状の膨出容易部１６が缶外方に膨出するように変形することで、その内側でタブ６の下端部と接触している部分（パネル部２の一部である突起部１５の周りの部分）が上方（缶外方）に変位して、その結果、タブ６の指掛け部６ａがパネル部２（凹部１０の底面１２）から浮き上がるようになっている。 That is, in the present embodiment, as shown in FIG. 2, the panel portion 2 of the can lid (the bottom surface 12 of the recess 10 formed in the panel portion 2) is formed below the vicinity of the base portion of the finger hooking portion 6a of the tab 6. As shown in FIG. 3A, the portion of the tab 15 that comes into contact with the lower end of the tab 6 around the projection 15 that fits in the recess on the back side of the tab 6 As shown in FIG. 3 (B), an annular bulging easy part 16 is formed on the outside as an easily deformable part, whereby when the can internal pressure acts on the panel part 2 of the can lid from the back side, By deforming the annular bulging easy portion 16 so as to bulge outward from the can, a portion in contact with the lower end portion of the tab 6 on the inner side (around the protrusion 15 which is a part of the panel portion 2) ) Is displaced upward (outside of the can), and as a result, the finger hooking portion 6a of the tab 6 becomes the panel portion. So that the floats from (the bottom surface 12 of the recess 10).

なお、このようなタブ回り止め用の突起部１５および環状の膨出容易部１６は、缶蓋の成形時に、先ず、タブ回り止め用の突起部１５よりも大きい予備突起部を形成し、次いで、この予備突起部の周辺部の膨出容易部１６に相当する部分を潰しながら、予備突起部の中央部のタブ回り止め用の突起部１５に相当する部分を突出させることによって成形される。 The tab detent projection 15 and the annular bulging easy portion 16 first form a preliminary projection larger than the tab detent projection 15 at the time of molding the can lid, and then Then, the portion corresponding to the bulging easy portion 16 in the peripheral portion of the preliminary projection is crushed, and the portion corresponding to the tab detent projection 15 at the center of the preliminary projection is projected .

また、本実施例では、タブ６と開口片８の領域を囲むように形成された凹部１０の傾斜面１１において、図２に示すように、タブ６の両側部と対向する部分１１ａ，１１ａで、凹部１０の底面１２に対する傾斜面１１の折れ曲がり角度が、図４（Ａ）に示すような他の部分（傾斜面１１の大部分）での折れ曲がり角度α１と比べて、図４（Ｂ）に示すように、部分的に小さな折れ曲がり角度α２となるように成形緩和されており、それによって、この成形緩和部１１ａ，１１ａの部分が、パネル部２の剛性を高めている（変形させ難い補強部となっている）傾斜面１１の部分において、比較的変形し易い変形容易部となっている。 Further, in this embodiment, in the inclined surface 11 of the recess 10 formed so as to surround the region of the tab 6 and the opening piece 8, as shown in FIG. 2, the portions 11 a and 11 a facing the both side portions of the tab 6 are used. 4B, the bending angle of the inclined surface 11 with respect to the bottom surface 12 of the recess 10 is compared with the bending angle α1 in the other part (most part of the inclined surface 11) as shown in FIG. 4A. As shown in the drawing, the molding is relaxed so as to partially have a small bending angle α2, and thereby the molding relaxation parts 11a and 11a have increased rigidity of the panel part 2 (a reinforcing part that is difficult to deform). The portion of the inclined surface 11 is an easily deformable portion that is relatively easily deformed.

さらに、そのようにタブ６の両側部と対向する位置で傾斜面１１に形成された成形緩和部１１ａ，１１ａに対して、本実施例では、図２に示すように、各成形緩和部１１ａ，１１ａの近傍からタブ６を横切る方向で、コイニングによる直線状の薄肉部１７が、変形容易部としてパネル部２（凹部１０の底面１２）の上面側に形成されており、それによって、缶内圧が缶蓋１のパネル部２に裏側から作用したときに、各成形緩和部１１ａ，１１ａの間の部分での変形が容易となり、その結果、図５（Ａ）に示すような元の状態から、図５（Ｂ）に示すように、タブ６を横切る方向で薄肉部１７に沿って折れ曲がるようにパネル部３の中央側が膨出して、タブ６の指掛け部６ａの末端側がパネル部２（凹部１０の底面１２）から浮き上がるようになっている。 Further, in the present embodiment, as shown in FIG. 2, each of the molding relaxation portions 11 a, 11 a formed on the inclined surface 11 at positions facing the both side portions of the tab 6, as shown in FIG. In the direction crossing the tab 6 from the vicinity of 11a, a thin linear portion 17 by coining is formed on the upper surface side of the panel portion 2 (the bottom surface 12 of the concave portion 10) as an easily deformable portion. When acting on the panel portion 2 of the can lid 1 from the back side, deformation at the portion between the molding relaxation portions 11a and 11a is facilitated, and as a result, from the original state as shown in FIG. As shown in FIG. 5B, the center side of the panel portion 3 bulges so as to bend along the thin portion 17 in a direction crossing the tab 6, and the terminal side of the finger-hanging portion 6 a of the tab 6 is the panel portion 2 (recess 10. So that it floats from the bottom 12) You have me.

上記のような本実施例の開口容易缶蓋によれば、缶内圧が缶蓋１のパネル部２に裏側から作用したときに、膨出容易部１６が環状に膨出変形することで、タブ６の指掛け部６ａがパネル部２（凹部１０の底面１２）から浮き上がると共に、各成形緩和部１１ａ，１１ａの間で薄肉部１７に沿って折れ曲がるようにパネル部２の中央側が膨出変形することで、さらに、タブ６の指掛け部６ａの末端側がパネル部２（凹部１０の底面１２）から浮き上がることとなり、その結果、タブ６の指掛け部６ａとパネル部２（凹部１０の底面１２）との間に大きな隙間が開くことで、指掛け部６ａに容易に指を掛けてタブ６を簡単に引き上げることができる。 According to the easy opening can lid of the present embodiment as described above, when the internal pressure of the can acts on the panel portion 2 of the can lid 1 from the back side, the bulging easy portion 16 bulges and deforms in an annular shape, so that the tab 6 finger-hanging portions 6a are lifted from the panel portion 2 (the bottom surface 12 of the concave portion 10), and the center side of the panel portion 2 bulges and deforms so as to bend along the thin-walled portion 17 between the molding relaxation portions 11a and 11a. Further, the terminal side of the finger hooking portion 6a of the tab 6 is lifted from the panel portion 2 (bottom surface 12 of the concave portion 10). As a result, the finger hooking portion 6a of the tab 6 and the panel portion 2 (bottom surface 12 of the concave portion 10) By opening a large gap therebetween, the tab 6 can be easily pulled up by easily placing a finger on the finger-hanging portion 6a.

以上、本発明の開口容易缶蓋の一実施例について説明したが、本発明は、上記のような実施例に限定されるものではなく、例えば、上記の実施例では、缶蓋のパネル部の変形容易部として、環状の膨出容易部１６と各成形緩和部１１ａ，１１ａと薄肉部１７とを全て設けるようにしているが、場合によっては、環状の膨出容易部１６のみを変形容易部として設けることで実施することも可能であって、環状の膨出容易部１６のみを変形容易部として設ける場合には、タブや開口片を缶蓋から切り離すことなく缶蓋のパネル部の一部を開口片として缶内に押し下げるようなステイオンタブ方式の缶蓋に限らず、缶蓋のパネル部の大部分を開口片としてタブと共に缶蓋から切り離すようなフルオープンタイプの缶蓋としても実施可能である等、適宜に設計変更可能なものである。 As mentioned above, although one Example of the easy opening can lid of this invention was described, this invention is not limited to the above Examples, For example, in said Example, in the panel part of a can lid, as easily deformable portion, an annular bulged readily portion 16 and each forming relieving portion 11a, but so as to form all of the 11a and the thin portion 17, in some cases, facilitate deformation only of the annular bulging easily portion 16 In the case where only the annular bulging easy portion 16 is provided as the easily deformable portion, the panel portion of the can lid is not separated from the can lid. It is not limited to the Steion Tab type can lid that pushes the part into the can as an opening piece, but also as a fully open type can lid that separates the majority of the panel part of the can lid from the can lid together with the tab as an opening piece Applicable, etc. And it is capable of design changes to.

従来のステイオンタブ方式の開口容易缶蓋について、缶蓋全体の構造を示す（Ａ）平面図、および（Ｂ）断面図。(A) Top view and (B) Cross-sectional view showing the structure of the entire can lid for a conventional steion tab type easy opening lid. 本発明の開口容易缶蓋の一実施例について、缶蓋の要部の構造を示す平面図。The top view which shows the structure of the principal part of a can lid about one Example of the easy opening can lid of this invention. 図２に示した実施例においてタブ回り止め用の突起部の周囲に形成される変形容易部（環状の膨出容易部）について、（Ａ）変形前の状態と（Ｂ）変形後の状態とをそれぞれ示す断面説明図。In the embodiment shown in FIG. 2, the easily deformable portion (annular bulge easy portion) formed around the tab detent projection (A) before deformation and (B) after deformation Cross-sectional explanatory drawing which shows each. 図２に示した実施例においてパネル部の凹部の傾斜面に形成される変形容易部（成形緩和部）について、（Ａ）成形緩和部ではない通常の傾斜面と（Ｂ）成形緩和部に形成された傾斜面とにおける傾斜面の折れ曲がり角度をそれぞれ示す断面説明図。In the embodiment shown in FIG. 2, the easily deformable portion (molding relief portion) formed on the sloped surface of the recess of the panel portion is formed on (A) a normal slope surface that is not the molding relief portion and (B) the molding relief portion Cross-sectional explanatory drawing which each shows the bending angle of the inclined surface in the made inclined surface. 図２に示した実施例においてパネル部の凹部の傾斜面の各成形緩和部の間に形成される変形容易部（薄肉部）について、（Ａ）変形前の状態と（Ｂ）変形後の状態とをそれぞれ示す断面説明図。In the embodiment shown in FIG. 2, (A) the state before deformation and (B) the state after deformation of the easily deformable portion (thin wall portion) formed between the respective formed relief portions of the inclined surface of the concave portion of the panel portion. Cross-sectional explanatory drawing which shows each.

Explanation of symbols

１缶蓋
２パネル部
５リベット部
６タブ
６ａ（タブの）指掛け部
７スコア線
８開口片
１０凹部
１１傾斜面
１１ａ成形緩和部（変形容易部）
１２底面
１５タブ回り止め用の突起部
１６環状の膨出容易部（変形容易部）
１７薄肉部（変形容易部） DESCRIPTION OF SYMBOLS 1 Can lid 2 Panel part 5 Rivet part 6 Tab 6a (Tab) finger-hanging part 7 Score line 8 Opening piece 10 Recessed part 11 Inclined surface 11a Molding relaxation part (deformable part)
12 Bottom surface 15 Protrusions for preventing rotation of tabs 16 Annular bulging easy part (deformable part)
17 Thin part (deformable part)

Claims

A score line for defining an opening piece is engraved on the panel portion of the can lid, and a tab for opening operation is riveted, and the one end side of the tab away from the rivet is pulled up as a finger-hanging portion. In the easy-to-open can lid that performs the opening operation, a pair of left and right protrusions for tab rotation prevention are provided on the panel portion of the can lid under the vicinity of the base of the finger-hook portion of the tab. An annular bulging easy part is formed so as to surround the periphery of each of the protrusions, and the annular bulging easy part is formed so as to fit in the recess. An opening characterized in that it is formed as an easily deformable portion that protrudes outward due to the internal pressure of the can generated by the production of a normal can , so that the protruding portion of the tab is raised by the protruding deformation. Easy can lid.

An opening piece is partially formed in the panel portion of the can lid so as to leave between the both ends of the score line as a hinge portion, and the tab is riveted outside the region of the opening piece at the approximate center of the panel portion of the can lid, In addition, the shallow concave portion having the inclined surface and the bottom surface surrounded by the inclined surface is formed in the panel portion of the can lid so as to include the region of the tab and the opening piece. In the vicinity of the portion facing the both sides of the tab, the bending angle of the inclined surface is relaxed so as to be partially smaller than the other portions, and this forming relaxation portion is an easily deformable portion. The easy-to-open can lid according to claim 1.

The easy-to-open can lid according to claim 2 , wherein a thin-walled portion that is an easily deformable portion is formed in a direction crossing the tab from the vicinity of the forming relaxation portion.