【特許請求の範囲】
【請求項１】 容器口部の頂面或いは頂面乃至そのコーナー部と密封的に係合するフランジ部と、容器口部の内周面と係合する側壁部と、閉塞底面部とを備えた中栓において、
前記側壁部の外周には側壁部の高さ方向に延びるリブ部と凹部とが交互に多数配置され、前記各リブ部の中間にはフランジ面に平行な共通平面上でしかも共通な円周上に位置する突起部が形成されていることを特徴とする易開栓性中栓。
【請求項２】 前記フランジ部の付け根には容器口部の内周側コーナー部と密封的に係合するコーナー部が形成されていることを特徴とする請求項１に記載の易開栓性中栓。
【請求項３】 前記円周上に位置する突起部の合計の周長をＬ、円周長をＬ０としたとき、Ｌ／Ｌ０の比が０．２５乃至０．８の範囲にあることを特徴とする請求項１または２に記載の易開栓性中栓。
【請求項４】 前記円周の径をＤ、容器口部の内径をＤ０としたとき、Ｄ／Ｄ０の比が１．０１乃至１．０９の範囲にあることを特徴とする請求項１乃至３の何れかに記載の易開栓性中栓。
【請求項５】 前記円周の径をＤ、突起部が位置する面上における凹部の最深部の径をＤ１、容器口部の内径をＤ０としたとき、各部の径が下記式
Ｄ＞Ｄ０＞Ｄ１
を満足する関係にあることを特徴とする請求項１乃至４の何れかに記載の易開栓性中栓。
【請求項６】 （Ｄ−Ｄ１）／Ｄの比が０．１乃至０．２５の範囲にあることを特徴とする請求項５に記載の易開栓性中栓。
【請求項７】 リブの数が６乃至２４個であることを特徴とする請求項１乃至６の何れかに記載の易開栓性中栓。
【請求項８】 前記側壁部または底面部には開栓用把持部が設けられている請求項１乃至７の何れかに記載の易開栓性中栓。
【請求項９】 容器口部に螺子締結により着脱自在に装着される合成樹脂製の蓋体と、該蓋体と容器口部上端との間で挟持される合成樹脂製の中栓とから成り、前記蓋体には開閉可能な弁機構が設けられている中栓付容器蓋において、前記中栓が、容器口部の頂面または頂面乃至そのコーナー部と密封的に係合するフランジ部と、容器口部の内周面と係合する側壁部と、閉塞底面部とを備え、前記側壁部の外周には側壁部の高さ方向に延びるリブ部と凹部とが交互に多数配置され、前記各リブ部の中間にはフランジ面に平行な共通平面上でしかも共通な円周上に位置する突起部が形成されていることを特徴とする易開栓性中栓付容器蓋。
【請求項１０】 前記中栓はフランジ部外周に薄肉周縁部と側壁部に底面部とを有する中栓であり、前記蓋体は、水平フランジ部を備えた頂板部と、該水平フランジ部から垂下したスカート部とを備え、前記スカート部の内面には、容器口部の外面に形成された螺条と螺子係合する螺条が形成されていると共に、該螺条よりも上方であって且つ前記水平フランジ部とは小間隔を置いた位置に中栓係止用突起が形成されていることを特徴とする請求項９記載の易開栓性中栓付容器蓋。
[Claims]
1. A flange portion that hermetically engages with the top surface or the top surface of the container mouth portion or its corner portion, a side wall portion that engages with the inner peripheral surface of the container mouth portion, and a closed bottom surface portion. In the inner plug
A large number of rib portions and recesses extending in the height direction of the side wall portion are alternately arranged on the outer periphery of the side wall portion, and in the middle of each rib portion, on a common plane parallel to the flange surface and on a common circumference. An easily openable inner plug characterized in that a protrusion located at is formed.
2. The easy-opening property according to claim 1, wherein a corner portion that is hermetically engaged with the inner peripheral side corner portion of the container mouth portion is formed at the base of the flange portion. Inner plug.
3. When the total circumference of the protrusions located on the circumference is L and the circumference is L 0 , the ratio of L / L 0 is in the range of 0.25 to 0.8. The easily openable inner plug according to claim 1 or 2.
4. The claim is characterized in that the ratio of D / D 0 is in the range of 1.01 to 1.09, where D is the diameter of the circumference and D 0 is the inner diameter of the container mouth. The easily openable inner plug according to any one of 1 to 3.
5. When the diameter of the circumference is D, the diameter of the deepest part of the recess on the surface where the protrusion is located is D 1 , and the inner diameter of the container mouth is D 0 , the diameter of each part is the following formula D. > D 0 > D 1
The easily openable inner plug according to any one of claims 1 to 4, wherein the relationship is satisfied.
6. The easily openable inner plug according to claim 5, wherein the ratio of (DD 1) / D is in the range of 0.1 to 0.25.
7. The easily openable inner plug according to any one of claims 1 to 6, wherein the number of ribs is 6 to 24.
8. The easily openable inner plug according to any one of claims 1 to 7, wherein a grip portion for opening is provided on the side wall portion or the bottom surface portion.
9. A lid made of synthetic resin that is detachably attached to the container mouth portion by fastening a screw, and an inner stopper made of synthetic resin sandwiched between the lid body and the upper end of the container mouth portion. In a container lid with an inner plug provided with a valve mechanism that can be opened and closed, the inner plug is a flange portion that hermetically engages with the top surface or the top surface of the container mouth portion or its corner portion. A side wall portion that engages with the inner peripheral surface of the container mouth portion and a closed bottom surface portion are provided, and a large number of rib portions and recesses extending in the height direction of the side wall portion are alternately arranged on the outer periphery of the side wall portion. A container lid with an easily openable inner plug, characterized in that a protrusion located on a common plane parallel to the flange surface and on a common circumference is formed in the middle of each of the rib portions.
10. The inner plug is an inner plug having a thin peripheral edge portion on the outer periphery of the flange portion and a bottom surface portion on the side wall portion, and the lid body is formed from a top plate portion having a horizontal flange portion and the horizontal flange portion. It is provided with a hanging skirt portion, and a screw engaging with a screw formed on the outer surface of the container mouth portion is formed on the inner surface of the skirt portion, and is above the screw. The container lid with an easily openable inner plug according to claim 9 , wherein a protrusion for locking the inner plug is formed at a position at a small distance from the horizontal flange portion.
中栓の側壁部２は全体として円周状に形成されており、その内周面１３は、型抜きが容易に行えるように、下向きに径が小さくなるようなテーパー状に形成されている。一方、その外周面１０には、リブ部５と凹部６とが形成されているが、リブ部５のフランジ部２よりも下方に離隔した位置に、径外方向に最も膨出した突起部７が形成されている。突起部７の下方には、下向きに径が縮小するテーパー部が形成されていて、容器口部への打栓が容易に行えるようになっている。
The side wall portion 2 of the inner plug is formed in a circumferential shape as a whole, and the inner peripheral surface 13 thereof is formed in a tapered shape so that the diameter decreases downward so that die cutting can be easily performed. On the other hand, the rib portion 5 and the recess 6 are formed on the outer peripheral surface 10, but the protrusion 7 that bulges most in the out-diameter direction is located at a position separated below the flange portion 2 of the rib portion 5. Is formed. A tapered portion whose diameter is reduced downward is formed below the protrusion 7, so that the container mouth can be easily plugged.