JP2022086920A

JP2022086920A - Safety cap

Info

Publication number: JP2022086920A
Application number: JP2020199219A
Authority: JP
Inventors: 和寿吉村; Kazuhisa Yoshimura
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-06-09

Abstract

To improve the operability of a safety cap.SOLUTION: An inner cap 2 has an opening protrusion and a closing protrusion 24, and an outer cap 3 has a locking protrusion and an elastic piece 34. The locking protrusion can pass through the opening protrusion in the circumferential direction, and the elastic piece 34 has a base end portion 34a, an intermediate portion 34b extending from the base end portion 34a to a tightening side in the circumferential direction, and a tip portion 34c protruding downward from the intermediate portion 34b and having a larger vertical dimension than the closing protrusion 24. When the outer cap 3 is rotated to the loose side in the circumferential direction, the tip portion 34c can get over the closing protrusion 24 to the loose side, and when the outer cap 3 is rotated to the tightening side in the circumferential direction, it is abutted against the closing protrusion 24 and locked. The locking protrusion is locked to the opening protrusion by rotating the elastic piece 34 to the loosening side in the circumferential direction in a state where the outer cap 3 is pushed down while elastically deforming the elastic piece 34, and the elastic piece 34 and the closing protrusion 24 are arranged apart from each other in a state where the locking protrusion and the closing protrusion are locked.SELECTED DRAWING: Figure 8

Description

本発明は、安全キャップに関する。 The present invention relates to a safety cap.

従来、子供の悪戯等によって容器のキャップが開栓されるのを抑制するチャイルドプルーフ機能付きの安全キャップが知られている。例えば特許文献１、２に記載の安全キャップでは、内キャップに対して外キャップを押し下げることで、内キャップと外キャップとが開栓（緩み）方向に供回り可能となり、キャップを開栓できる。 Conventionally, a safety cap with a child-proof function that prevents the cap of a container from being opened due to mischief by a child or the like is known. For example, in the safety caps described in Patent Documents 1 and 2, by pushing down the outer cap with respect to the inner cap, the inner cap and the outer cap can rotate in the opening (loose) direction, and the cap can be opened.

特開２０１６－２０４０２１号公報Japanese Unexamined Patent Publication No. 2016-204021 特開２０１９－６４６６号公報Japanese Unexamined Patent Publication No. 2019-6466

この種のチャイルドプルーフ機能を備えた安全キャップでは、より操作性を高める点に改善の余地があった。 With this type of safety cap with childproof function, there was room for improvement in terms of improving operability.

本発明は、操作性を向上できる安全キャップを提供することを目的の一つとする。 One of the objects of the present invention is to provide a safety cap capable of improving operability.

本発明の安全キャップの一つの態様は、上下方向に延びるキャップ軸を中心とする有頂筒状であり、容器の口部に装着される内キャップと、前記内キャップを覆う有頂筒状であり、前記内キャップに対して前記キャップ軸回りの周方向に回転可能にかつ前記上下方向に移動可能に装着される外キャップと、を備え、前記内キャップは、第１頂壁と、前記第１頂壁の外周部から垂下設される第１周壁と、前記第１頂壁の上面から突出する開栓用突起と、前記第１頂壁の上面から突出する閉栓用突起と、を有し、前記外キャップは、前記第１頂壁の上側に配置される第２頂壁と、前記第２頂壁の外周部から垂下設され、前記第１周壁の径方向外側に配置される第２周壁と、前記第２頂壁の下面および前記第２周壁の内周面の少なくともいずれかから突出する係止突起と、前記第２頂壁から下側に突出し前記周方向に延びる弾性変形可能な弾性片と、を有し、前記係止突起は、前記開栓用突起の径方向位置と同じ径方向位置に配置される部分を有し、かつ、前記開栓用突起を前記周方向に通過可能であり、前記弾性片は、前記閉栓用突起の径方向位置と同じ径方向位置に配置される部分を有し、前記弾性片は、前記第２頂壁から下側に突出する基端部と、前記基端部から前記周方向の締込み側に延びる中間部と、前記中間部から下側に突出し、前記閉栓用突起よりも前記上下方向の寸法が大きい先端部と、を有し、前記先端部は、前記外キャップを前記周方向の緩み側に回転させた場合には、前記弾性片が弾性変形することで前記閉栓用突起を前記緩み側に乗り越え可能であり、前記外キャップを前記周方向の締込み側に回転させた場合には、前記閉栓用突起に突き当てられて係止され、前記係止突起は、前記弾性片を弾性変形させつつ前記外キャップを押し下げた状態で前記周方向の緩み側に回転させることにより、前記周方向において前記開栓用突起と係止され、前記係止突起と前記開栓用突起とが係止された状態において、前記弾性片と前記閉栓用突起とが離れて配置される。 One aspect of the safety cap of the present invention is an eclipsed tubular shape centered on a cap shaft extending in the vertical direction, and is an inner cap attached to the mouth of the container and an eclipsed tubular shape covering the inner cap. The inner cap includes an outer cap that is rotatably mounted in the circumferential direction around the cap axis and is movable in the vertical direction with respect to the inner cap, and the inner cap includes a first top wall and the first top wall. (1) It has a first peripheral wall hanging from the outer peripheral portion of the top wall, an opening protrusion protruding from the upper surface of the first top wall, and a closing protrusion protruding from the upper surface of the first top wall. The outer cap is a second top wall arranged on the upper side of the first top wall and a second top wall suspended from the outer peripheral portion of the second top wall and arranged radially outside the first peripheral wall. A peripheral wall, a locking projection protruding from at least one of the lower surface of the second top wall and the inner peripheral surface of the second peripheral wall, and elastically deformable extending downward from the second top wall and extending in the circumferential direction. It has an elastic piece, and the locking protrusion has a portion arranged at the same radial position as the radial position of the opening protrusion, and passes through the opening protrusion in the circumferential direction. It is possible, the elastic piece has a portion arranged at the same radial position as the radial position of the plugging protrusion, and the elastic piece has a proximal end portion protruding downward from the second top wall. It has an intermediate portion extending from the base end portion to the tightening side in the circumferential direction, and a tip portion protruding downward from the intermediate portion and having a larger vertical dimension than the plugging protrusion. When the outer cap is rotated to the loose side in the circumferential direction, the tip portion can overcome the plugging protrusion to the loose side by elastically deforming the elastic piece, and the outer cap can be used. When it is rotated to the tightening side in the circumferential direction, it is abutted against the plugging protrusion and locked, and the locking protrusion is in a state where the outer cap is pushed down while elastically deforming the elastic piece. By rotating to the loose side in the circumferential direction, the elastic piece and the elastic piece are locked in the circumferential direction, and the locking protrusion and the opening protrusion are locked. It is placed apart from the closing protrusion.

また本発明の安全キャップの一つの態様は、上下方向に延びるキャップ軸を中心とする有頂筒状であり、容器の口部に装着される内キャップと、前記内キャップを覆う有頂筒状であり、前記内キャップに対して前記キャップ軸回りの周方向に回転可能にかつ前記上下方向に移動可能に装着される外キャップと、を備え、前記内キャップは、第１頂壁と、前記第１頂壁の外周部から垂下設される第１周壁と、前記第１頂壁の上面から突出する開栓用突起と、前記第１頂壁から上側に突出し前記周方向に延びる弾性変形可能な弾性片と、を有し、前記外キャップは、前記第１頂壁の上側に配置される第２頂壁と、前記第２頂壁の外周部から垂下設され、前記第１周壁の径方向外側に配置される第２周壁と、前記第２頂壁の下面および前記第２周壁の内周面の少なくともいずれかから突出する係止突起と、前記第２頂壁の下面から突出する閉栓用突起と、を有し、前記係止突起は、前記開栓用突起の径方向位置と同じ径方向位置に配置される部分を有し、かつ、前記開栓用突起を前記周方向に通過可能であり、前記弾性片は、前記閉栓用突起の径方向位置と同じ径方向位置に配置される部分を有し、前記弾性片は、前記第１頂壁から上側に突出する基端部と、前記基端部から前記周方向の緩み側に延びる中間部と、前記中間部から上側に突出し、前記閉栓用突起よりも前記上下方向の寸法が大きい先端部と、を有し、前記閉栓用突起は、前記外キャップを前記周方向の緩み側に回転させた場合には、前記弾性片が弾性変形することで前記先端部を前記緩み側に乗り越え可能であり、前記外キャップを前記周方向の締込み側に回転させた場合には、前記先端部に突き当てられて係止され、前記係止突起は、前記弾性片を弾性変形させつつ前記外キャップを押し下げた状態で前記周方向の緩み側に回転させることにより、前記周方向において前記開栓用突起と係止され、前記係止突起と前記開栓用突起とが係止された状態において、前記弾性片と前記閉栓用突起とが離れて配置される。 Further, one aspect of the safety cap of the present invention is an eclipsed cylinder centered on a cap shaft extending in the vertical direction, an inner cap attached to the mouth of the container, and an eclipsed cylinder covering the inner cap. The inner cap is provided with an outer cap that is rotatably mounted in the circumferential direction around the cap axis and is movable in the vertical direction with respect to the inner cap, and the inner cap is the first top wall and the said. A first peripheral wall that hangs down from the outer peripheral portion of the first top wall, an opening protrusion that protrudes from the upper surface of the first top wall, and an elastically deformable protrusion that protrudes upward from the first top wall and extends in the circumferential direction. The outer cap has a second top wall arranged above the first top wall, and is hung from the outer peripheral portion of the second top wall, and has a diameter of the first peripheral wall. A second peripheral wall arranged on the outer side in the direction, a locking projection protruding from at least one of the lower surface of the second top wall and the inner peripheral surface of the second peripheral wall, and a closing plug protruding from the lower surface of the second top wall. The locking projection has a portion arranged at the same radial position as the radial position of the opening projection, and passes through the opening projection in the circumferential direction. It is possible, the elastic piece has a portion arranged at the same radial position as the radial position of the plugging protrusion, and the elastic piece has a proximal end portion protruding upward from the first top wall. It has an intermediate portion extending from the base end portion to the loosening side in the circumferential direction, and a tip portion protruding upward from the intermediate portion and having a larger vertical dimension than the plugging protrusion, and for closing the plug. When the outer cap is rotated to the loose side in the circumferential direction, the protrusion can overcome the tip portion of the elastic piece by elastically deforming to the loose side, and the outer cap can be moved to the loose side in the circumferential direction. When it is rotated to the tightening side, it is abutted against the tip and locked, and the locking projection is in the circumferential direction with the outer cap pushed down while elastically deforming the elastic piece. By rotating to the loosening side, the elastic piece and the plugging protrusion are engaged in the circumferential direction, and the elastic piece and the plugging protrusion are engaged in a state where the locking protrusion and the plugging protrusion are locked. Are placed apart.

この安全キャップでは、キャップ開栓時においては、弾性片を弾性変形させつつ外キャップを押し下げた状態のまま周方向の緩み側に回転させることで、周方向において係止突起と開栓用突起とが係止され、外キャップと内キャップとが供回り可能となり、キャップが開栓される。これに対し、例えば子供などが、外キャップを押し下げずに単に周方向の緩み側に回転させた場合には、弾性片の先端部および閉栓用突起のいずれか一方が他方を緩み側に乗り越え、かつ周方向において係止突起と開栓用突起とが係止されないため、外キャップが空転してキャップは開栓されない。つまりこの安全キャップは、子供の悪戯等によってキャップが開栓されるのを抑制するチャイルドプルーフ機能を備えている。また、キャップ閉栓時においては、外キャップを周方向の締込み側に回転させることで、周方向において弾性片の先端部と閉栓用突起とが係止され、外キャップと内キャップとが供回り可能となり、キャップは閉栓される。 In this safety cap, when the cap is opened, the elastic piece is elastically deformed and the outer cap is rotated to the loosening side in the circumferential direction while the outer cap is pushed down, so that the locking protrusion and the opening protrusion are formed in the circumferential direction. Is locked, the outer cap and the inner cap can be rotated, and the cap is opened. On the other hand, when, for example, a child simply rotates the outer cap to the loosening side in the circumferential direction without pushing down, either the tip of the elastic piece or the plugging protrusion gets over the loosening side of the other. Moreover, since the locking protrusion and the opening protrusion are not locked in the circumferential direction, the outer cap slips and the cap is not opened. That is, this safety cap has a child-proof function that prevents the cap from being opened due to mischief by a child or the like. In addition, when the cap is closed, by rotating the outer cap to the tightening side in the circumferential direction, the tip of the elastic piece and the plugging protrusion are locked in the circumferential direction, and the outer cap and the inner cap rotate together. It becomes possible and the cap is closed.

本発明によれば、弾性片の先端部の上下方向の寸法が、閉栓用突起の上下方向の寸法よりも大きい。そして、外キャップを押し下げ、係止突起と開栓用突起とが係止された状態において、弾性片と閉栓用突起とは非接触であり互いに干渉しない。例えば本発明と異なり、外キャップを押し下げた際に、弾性片と閉栓用突起とが上下方向で干渉する構成の場合には、外キャップの押し下げ量が不十分となり、係止突起と開栓用突起との係止状態も不安定となって、キャップを安定して開栓できないおそれがある。一方、本発明によれば、このような不具合が抑えられ、特にキャップ開栓時の操作性が安定して高められる。 According to the present invention, the vertical dimension of the tip of the elastic piece is larger than the vertical dimension of the plugging protrusion. Then, in a state where the outer cap is pushed down and the locking protrusion and the plugging protrusion are locked, the elastic piece and the plugging protrusion are not in contact with each other and do not interfere with each other. For example, unlike the present invention, when the outer cap is pushed down and the elastic piece and the plugging protrusion interfere with each other in the vertical direction, the pushing down amount of the outer cap becomes insufficient, and the locking protrusion and the plugging protrusion are used. The locked state with the protrusion may also become unstable, and the cap may not be opened stably. On the other hand, according to the present invention, such a defect is suppressed, and in particular, operability at the time of opening the cap is stably enhanced.

上記安全キャップにおいて、前記弾性片は、少なくとも前記中間部と前記先端部との接続部分が湾曲状であり、前記係止突起と前記開栓用突起とが係止された状態において、前記接続部分と前記閉栓用突起とは、前記上下方向に対向して配置されることが好ましい。 In the safety cap, the elastic piece has a curved connecting portion between at least the intermediate portion and the tip portion, and the connecting portion is in a state where the locking projection and the opening projection are locked. And the plugging protrusion are preferably arranged so as to face each other in the vertical direction.

この場合、弾性片の湾曲した接続部分の直下（または直上）に閉栓用突起が配置されるため、弾性片と閉栓用突起との接触をより抑制できる。 In this case, since the closing protrusion is arranged directly below (or directly above) the curved connection portion of the elastic piece, the contact between the elastic piece and the closing protrusion can be further suppressed.

上記安全キャップにおいて、前記開栓用突起は、前記周方向に互いに間隔をあけて複数設けられ、前記係止突起は、前記周方向に互いに間隔をあけて複数または１つ設けられ、前記開栓用突起の数が、前記係止突起の数よりも多いことが好ましい。 In the safety cap, a plurality of the opening protrusions are provided at intervals in the circumferential direction, and a plurality or one of the locking protrusions are provided at intervals in the circumferential direction. It is preferable that the number of protrusions is larger than the number of locking protrusions.

この場合、外キャップを押し下げた状態で周方向の緩み側に回転させたときに、係止突起と開栓用突起とが係止されるまでの外キャップの回転量を少なく抑えることができる。このため、キャップ開栓時の操作性がより向上する。 In this case, when the outer cap is rotated to the loose side in the circumferential direction with the outer cap pushed down, the amount of rotation of the outer cap until the locking protrusion and the opening protrusion are locked can be suppressed to a small amount. Therefore, the operability at the time of opening the cap is further improved.

上記安全キャップにおいて、前記開栓用突起のうち少なくとも前記係止突起と係止される部分は、前記閉栓用突起よりも径方向外側に位置することが好ましい。 In the safety cap, at least a portion of the opening protrusion that is locked to the locking protrusion is preferably located radially outside the closing protrusion.

キャップ開栓時には、外キャップを押し下げた状態を維持しつつ周方向の緩み側に回転させる操作が必要であり、つまり押下力および回転力が必要となる。本発明の上記構成によれば、係止突起と開栓用突起との係止部分が、閉栓用突起よりも径方向外側に配置されるため、係止突起および開栓用突起を介して、外キャップから内キャップへと効率よく回転力が伝えられる。小さな回転力でキャップを開栓でき、操作性がより向上する。 At the time of opening the cap, it is necessary to rotate the outer cap to the loosening side in the circumferential direction while maintaining the pressed down state, that is, a pressing force and a rotational force are required. According to the above configuration of the present invention, since the locking portion between the locking protrusion and the opening protrusion is arranged radially outside the closing protrusion, the locking protrusion and the opening protrusion are interposed. The rotational force is efficiently transmitted from the outer cap to the inner cap. The cap can be opened with a small rotational force, improving operability.

本発明の一つの態様の安全キャップによれば、操作性を向上できる。 According to the safety cap of one aspect of the present invention, operability can be improved.

図１は、第１実施形態の安全キャップを示す縦断面図である。FIG. 1 is a vertical sectional view showing a safety cap according to the first embodiment. 図２は、安全キャップを示す縦断面図であり、外キャップを押し下げた状態を表す。FIG. 2 is a vertical cross-sectional view showing a safety cap, and shows a state in which the outer cap is pushed down. 図３は、安全キャップを模式的に示す横断面図であり、第１開栓用突起と係止突起とが係止された状態を表す。FIG. 3 is a cross-sectional view schematically showing the safety cap, and shows a state in which the first opening protrusion and the locking protrusion are locked. 図４は、安全キャップの一部を拡大して示す縦断面図である。FIG. 4 is an enlarged vertical sectional view showing a part of the safety cap. 図５は、安全キャップの一部を拡大して示す縦断面図であり、外キャップを押し下げた状態を表す。FIG. 5 is a vertical cross-sectional view showing a part of the safety cap in an enlarged manner, and shows a state in which the outer cap is pushed down. 図６は、安全キャップを模式的に示す横断面図であり、第２開栓用突起と係止突起とが係止された状態を表す。FIG. 6 is a cross-sectional view schematically showing the safety cap, and shows a state in which the second opening protrusion and the locking protrusion are locked. 図７は、安全キャップの一部を拡大して示す縦断面図である。FIG. 7 is an enlarged vertical sectional view showing a part of the safety cap. 図８は、安全キャップの一部を拡大して示す縦断面図であり、外キャップを押し下げた状態を表す。FIG. 8 is a vertical cross-sectional view showing a part of the safety cap in an enlarged manner, and shows a state in which the outer cap is pushed down. 図９は、第１実施形態の変形例の安全キャップの一部を拡大して示す縦断面図である。FIG. 9 is an enlarged vertical sectional view showing a part of the safety cap of the modified example of the first embodiment. 図１０は、第２実施形態の安全キャップの一部を拡大して示す縦断面図である。FIG. 10 is an enlarged vertical sectional view showing a part of the safety cap of the second embodiment.

＜第１実施形態＞
本発明の第１実施形態の安全キャップ１Ａについて、図１～図８を参照して説明する。なお以下では、安全キャップ１Ａを単にキャップと呼ぶ場合がある。安全キャップ１Ａは、子供の悪戯等によって容器のキャップが開栓されるのを抑制するチャイルドプルーフ機能を備えている。 <First Embodiment>
The safety cap 1A of the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. In the following, the safety cap 1A may be simply referred to as a cap. The safety cap 1A has a child proof function that prevents the cap of the container from being opened due to mischief by a child or the like.

図１に示すように、本実施形態の安全キャップ１Ａは、有底筒状の容器１００の口部１００ａに取り付けられる。容器１００には、図示しない内容物が収容される。安全キャップ１Ａは、キャップ軸Ｃを中心とする有頂筒状であり口部１００ａに装着される内キャップ２と、内キャップ２を覆う有頂筒状であり内キャップ２に装着される外キャップ３と、シール部材４と、を備える。
口部１００ａ、内キャップ２、外キャップ３およびシール部材４は、キャップ軸Ｃを中心として互いに同軸に配置される。つまりキャップ軸Ｃは、口部１００ａ、内キャップ２、外キャップ３およびシール部材４の共通軸である。 As shown in FIG. 1, the safety cap 1A of the present embodiment is attached to the mouth portion 100a of the bottomed cylindrical container 100. The container 100 contains contents (not shown). The safety cap 1A has an inner cap 2 having a ridged cylinder centered on the cap shaft C and attached to the mouth portion 100a, and an outer cap 2 having a ridged cylinder shape covering the inner cap 2 and attached to the inner cap 2. 3 and a seal member 4.
The mouth portion 100a, the inner cap 2, the outer cap 3 and the sealing member 4 are arranged coaxially with each other about the cap shaft C. That is, the cap shaft C is a common shaft of the mouth portion 100a, the inner cap 2, the outer cap 3, and the seal member 4.

本実施形態では、キャップ軸Ｃが延びる方向、つまりキャップ軸Ｃと平行な方向を上下方向と呼ぶ。上下方向のうち、内キャップ２の頂壁（後述する第１頂壁２１）から外キャップ３の頂壁（後述する第２頂壁３１）へ向かう方向を上側と呼び、外キャップ３の頂壁（第２頂壁３１）から内キャップ２の頂壁（第１頂壁２１）へ向かう方向を下側と呼ぶ。
上下方向から見た平面視で、キャップ軸Ｃと直交する方向を径方向と呼ぶ。径方向のうち、キャップ軸Ｃに近づく方向を径方向内側と呼び、キャップ軸Ｃから離れる方向を径方向外側と呼ぶ。
キャップ軸Ｃ回りに周回する方向を周方向と呼ぶ。図３に示すように、周方向のうち、図示しない使用者が外キャップ３を回転操作してキャップを開栓させる方向（＋θ側）を緩み側と呼び、キャップを閉栓させる方向（－θ側）を締込み側と呼ぶ。 In the present embodiment, the direction in which the cap shaft C extends, that is, the direction parallel to the cap shaft C is referred to as the vertical direction. Of the vertical directions, the direction from the top wall of the inner cap 2 (first top wall 21 described later) to the top wall of the outer cap 3 (second top wall 31 described later) is called the upper side, and the top wall of the outer cap 3 is called the upper side. The direction from (second top wall 31) to the top wall (first top wall 21) of the inner cap 2 is called the lower side.
The direction orthogonal to the cap axis C in the plan view seen from the vertical direction is called the radial direction. Of the radial directions, the direction closer to the cap shaft C is called the radial inner side, and the direction away from the cap shaft C is called the radial outer side.
The direction that orbits around the cap axis C is called the circumferential direction. As shown in FIG. 3, of the circumferential directions, the direction in which the user (not shown) rotates the outer cap 3 to open the cap (+ θ side) is called the loosening side, and the direction in which the cap is closed (−θ side). ) Is called the tightening side.

図１に示すように、容器１００の口部１００ａは、上下方向に延びる筒状である。口部１００ａは、口部１００ａの外周面に雄ネジ部１００ｂを有する。 As shown in FIG. 1, the mouth portion 100a of the container 100 has a cylindrical shape extending in the vertical direction. The mouth portion 100a has a male screw portion 100b on the outer peripheral surface of the mouth portion 100a.

内キャップ２は、第１頂壁２１と、第１周壁２２と、開栓用突起２３と、閉栓用突起２４と、摺動リブ２５と、を有する。内キャップ２は、単一の部材により一体に形成される。
第１頂壁２１は、キャップ軸Ｃを中心とする円板状であり、キャップ軸Ｃと垂直な方向に拡がる。第１頂壁２１の一対の板面は、上下方向を向く。第１頂壁２１は、口部１００ａの上側に配置される。第１頂壁２１は、シール部材４を介して、口部１００ａの上端開口部を上側から覆う。 The inner cap 2 has a first top wall 21, a first peripheral wall 22, a plug opening protrusion 23, a plug closing protrusion 24, and a sliding rib 25. The inner cap 2 is integrally formed by a single member.
The first top wall 21 has a disk shape centered on the cap shaft C and extends in a direction perpendicular to the cap shaft C. The pair of plate surfaces of the first top wall 21 face in the vertical direction. The first top wall 21 is arranged above the mouth portion 100a. The first top wall 21 covers the upper end opening of the mouth portion 100a from above via the sealing member 4.

第１周壁２２は、キャップ軸Ｃを中心とする円筒状であり、上下方向に延びる。第１周壁２２は、第１頂壁２１の外周部から垂下設される。第１周壁２２は、口部１００ａの径方向外側に配置される。第１周壁２２は、雌ネジ部２２ａと、第１抜止め突起２２ｂと、を有する。 The first peripheral wall 22 has a cylindrical shape centered on the cap shaft C and extends in the vertical direction. The first peripheral wall 22 is hung from the outer peripheral portion of the first top wall 21. The first peripheral wall 22 is arranged on the outer side in the radial direction of the mouth portion 100a. The first peripheral wall 22 has a female screw portion 22a and a first retaining protrusion 22b.

雌ネジ部２２ａは、第１周壁２２の内周面に配置される。雌ネジ部２２ａは、口部１００ａの雄ネジ部１００ｂと螺着される。すなわち安全キャップ１Ａは、容器１００の口部１００ａに、螺着により着脱可能に取り付けられる。
第１抜止め突起２２ｂは、第１周壁２２の外周面から突出する。第１抜止め突起２２ｂは、例えば、周方向に延びるリブ状である。 The female screw portion 22a is arranged on the inner peripheral surface of the first peripheral wall 22. The female screw portion 22a is screwed to the male screw portion 100b of the mouth portion 100a. That is, the safety cap 1A is detachably attached to the mouth portion 100a of the container 100 by screwing.
The first retaining protrusion 22b projects from the outer peripheral surface of the first peripheral wall 22. The first retaining protrusion 22b has, for example, a rib shape extending in the circumferential direction.

開栓用突起２３は、第１頂壁２１の上面から突出する。図３に示すように、開栓用突起２３は、第１頂壁２１の上面のうち外周部に配置される。開栓用突起２３は、周方向に延びるリブ状である。開栓用突起２３の周方向を向く一対の端面は、それぞれ、周方向と垂直な方向に拡がる平面状である。開栓用突起２３は、周方向に互いに間隔をあけて複数設けられる。図示の例では、開栓用突起２３が周方向に等ピッチで６つ配置される。 The opening protrusion 23 projects from the upper surface of the first top wall 21. As shown in FIG. 3, the opening protrusion 23 is arranged on the outer peripheral portion of the upper surface of the first top wall 21. The opening protrusion 23 has a rib shape extending in the circumferential direction. Each of the pair of end faces facing the circumferential direction of the opening protrusion 23 is a flat surface extending in a direction perpendicular to the circumferential direction. A plurality of opening protrusions 23 are provided at intervals in the circumferential direction. In the illustrated example, six opening protrusions 23 are arranged at equal pitches in the circumferential direction.

複数の開栓用突起２３は、第１開栓用突起２３ａと、第２開栓用突起２３ｂと、を含む。第１開栓用突起２３ａは、周方向において、閉栓用突起２４の緩み側（＋θ側）に配置される。第２開栓用突起２３ｂは、周方向において、閉栓用突起２４の締込み側（－θ側）に配置される。本実施形態では、第１開栓用突起２３ａが複数（３つ）設けられ、第２開栓用突起２３ｂが複数（３つ）設けられる。第１開栓用突起２３ａと第２開栓用突起２３ｂとは、周方向に交互に並ぶ。第１開栓用突起２３ａと第２開栓用突起２３ｂとは、互いに同一形状である。 The plurality of opening protrusions 23 include a first opening protrusion 23a and a second opening protrusion 23b. The first opening protrusion 23a is arranged on the loosening side (+ θ side) of the closing protrusion 24 in the circumferential direction. The second opening protrusion 23b is arranged on the tightening side (−θ side) of the closing protrusion 24 in the circumferential direction. In the present embodiment, a plurality (three) of the first opening protrusions 23a are provided, and a plurality (three) of the second opening protrusions 23b are provided. The first opening protrusion 23a and the second opening protrusion 23b are arranged alternately in the circumferential direction. The first opening protrusion 23a and the second opening protrusion 23b have the same shape.

図１に示すように、閉栓用突起２４は、第１頂壁２１の上面から突出する。閉栓用突起２４は、第１頂壁２１の上面のうち、径方向においてキャップ軸Ｃが位置する中央部と外周部との間に配置される。閉栓用突起２４は、開栓用突起２３よりも径方向内側に位置する部分を有する。言い換えると、開栓用突起２３は、閉栓用突起２４よりも径方向外側に位置する部分を有する。図示の例では、閉栓用突起２４の径方向外端部の径方向位置と、開栓用突起２３の径方向内端部の径方向位置とが、互いに同じである。 As shown in FIG. 1, the plugging protrusion 24 projects from the upper surface of the first top wall 21. The closing protrusion 24 is arranged between the central portion and the outer peripheral portion where the cap shaft C is located in the radial direction on the upper surface of the first top wall 21. The plugging protrusion 24 has a portion located radially inside the plugging protrusion 23. In other words, the opening protrusion 23 has a portion located radially outward of the closing protrusion 24. In the illustrated example, the radial position of the radial outer end portion of the plugging protrusion 24 and the radial position of the radial inner end portion of the plugging protrusion 23 are the same as each other.

図３に示すように、閉栓用突起２４は、径方向に延びるリブ状である。閉栓用突起２４は、周方向において、第１開栓用突起２３ａと、この第１開栓用突起２３ａの周方向の締込み側（－θ側）に隣り合う第２開栓用突起２３ｂと、の間に位置する。閉栓用突起２４は、周方向に互いに間隔をあけて複数設けられる。図示の例では、閉栓用突起２４が周方向に等ピッチで３つ配置される。 As shown in FIG. 3, the plugging protrusion 24 has a rib shape extending in the radial direction. The closing protrusion 24 includes a first opening protrusion 23a in the circumferential direction and a second opening protrusion 23b adjacent to the tightening side (−θ side) in the circumferential direction of the first opening protrusion 23a. Located between ,. A plurality of closing protrusions 24 are provided at intervals in the circumferential direction. In the illustrated example, three plugging protrusions 24 are arranged at equal pitches in the circumferential direction.

図４に示すように、閉栓用突起２４は、周方向を向く一対の側面を有する。一対の側面のうち、周方向の締込み側（－θ側）を向く一方の側面は、傾斜面２４ａであり、周方向の緩み側（＋θ側）を向く他方の側面は、突き当て面２４ｂである。すなわち、閉栓用突起２４は、傾斜面２４ａと、突き当て面２４ｂと、を有する。傾斜面２４ａは、上側へ向かうに従い周方向の緩み側に位置する傾斜面状である。突き当て面２４ｂは、周方向と垂直な方向に拡がる平面状である。 As shown in FIG. 4, the plugging protrusion 24 has a pair of side surfaces facing in the circumferential direction. Of the pair of side surfaces, one side facing the tightening side (−θ side) in the circumferential direction is the inclined surface 24a, and the other side surface facing the loosening side (+ θ side) in the circumferential direction is the abutting surface 24b. Is. That is, the plugging protrusion 24 has an inclined surface 24a and an abutting surface 24b. The inclined surface 24a has an inclined surface shape that is located on the loose side in the circumferential direction toward the upper side. The abutting surface 24b has a planar shape extending in a direction perpendicular to the circumferential direction.

図１に示すように、摺動リブ２５は、第１頂壁２１の上面から突出し、周方向に延びる。摺動リブ２５の上面は、キャップ軸Ｃと垂直な方向に拡がる平面状である。摺動リブ２５の上面は、開栓用突起２３の上面よりも下側に位置する。 As shown in FIG. 1, the sliding rib 25 projects from the upper surface of the first top wall 21 and extends in the circumferential direction. The upper surface of the sliding rib 25 is a flat surface extending in a direction perpendicular to the cap axis C. The upper surface of the sliding rib 25 is located below the upper surface of the opening protrusion 23.

外キャップ３は、内キャップ２に対して周方向に回転可能であり、かつ上下方向に移動可能である。外キャップ３は、第２頂壁３１と、第２周壁３２と、係止突起３３と、弾性片３４と、を有する。外キャップ３の構成要素のうち、後述する上カバー３５ｂ以外の部分は、単一の部材により一体に形成される。 The outer cap 3 can rotate in the circumferential direction with respect to the inner cap 2 and can move in the vertical direction. The outer cap 3 has a second top wall 31, a second peripheral wall 32, a locking projection 33, and an elastic piece 34. Of the components of the outer cap 3, the portions other than the upper cover 35b, which will be described later, are integrally formed by a single member.

第２頂壁３１は、第１頂壁２１の上側に配置される。第２頂壁３１は、頂壁本体３５ａと、上カバー３５ｂと、開口部３１ａと、を有する。
頂壁本体３５ａは、キャップ軸Ｃを中心とする円板状であり、キャップ軸Ｃと垂直な方向に拡がる。頂壁本体３５ａの一対の板面は、上下方向を向く。 The second top wall 31 is arranged above the first top wall 21. The second top wall 31 has a top wall main body 35a, an upper cover 35b, and an opening 31a.
The top wall main body 35a has a disk shape centered on the cap shaft C, and extends in a direction perpendicular to the cap shaft C. The pair of plate surfaces of the top wall main body 35a face in the vertical direction.

上カバー３５ｂは、頂壁本体３５ａの上側に配置される。上カバー３５ｂは、キャップ軸Ｃを中心とする有頂筒状である。上カバー３５ｂの頂壁部は、頂壁本体３５ａおよび開口部３１ａを上側から覆う。上カバー３５ｂの周壁部は、第２周壁３２の上端部内に嵌合する。図示の例では、上カバー３５ｂの周壁部が、アンダーカット嵌合により上側への抜け出しを規制された状態で、第２周壁３２内に嵌合する。上カバー３５ｂの周壁部の下端面は、頂壁本体３５ａの上面と接触する。 The upper cover 35b is arranged on the upper side of the top wall main body 35a. The upper cover 35b has a ridged cylinder shape centered on the cap shaft C. The top wall portion of the top cover 35b covers the top wall main body 35a and the opening 31a from above. The peripheral wall portion of the upper cover 35b is fitted in the upper end portion of the second peripheral wall 32. In the illustrated example, the peripheral wall portion of the upper cover 35b is fitted into the second peripheral wall 32 in a state where the outer cover is restricted from coming out upward by the undercut fitting. The lower end surface of the peripheral wall portion of the upper cover 35b comes into contact with the upper surface of the top wall main body 35a.

開口部３１ａは、頂壁本体３５ａを上下方向に貫通する孔である。開口部３１ａは、周方向に延びる円弧孔状である。開口部３１ａは、周方向に互いに間隔をあけて複数配置される。本実施形態では開口部３１ａが、周方向に等ピッチで３つ設けられる。開口部３１ａの数は、弾性片３４の数と同じである。 The opening 31a is a hole that penetrates the top wall main body 35a in the vertical direction. The opening 31a has an arcuate shape extending in the circumferential direction. A plurality of openings 31a are arranged at intervals in the circumferential direction. In this embodiment, three openings 31a are provided at equal pitches in the circumferential direction. The number of openings 31a is the same as the number of elastic pieces 34.

第２周壁３２は、キャップ軸Ｃを中心とする円筒状であり、上下方向に延びる。第２周壁３２は、第２頂壁３１の外周部から垂下設され、第１周壁２２の径方向外側に配置される。第２周壁３２の上下方向の寸法は、第１周壁２２の上下方向の寸法よりも大きい。第２周壁３２の下端面は、第１周壁２２の下端面よりも下側に位置する。 The second peripheral wall 32 has a cylindrical shape centered on the cap shaft C and extends in the vertical direction. The second peripheral wall 32 is hung from the outer peripheral portion of the second top wall 31, and is arranged on the radial outer side of the first peripheral wall 22. The vertical dimension of the second peripheral wall 32 is larger than the vertical dimension of the first peripheral wall 22. The lower end surface of the second peripheral wall 32 is located below the lower end surface of the first peripheral wall 22.

第２周壁３２は、第２抜止め突起３２ａを有する。
第２抜止め突起３２ａは、第２周壁３２の内周面から突出する。第２抜止め突起３２ａは、例えば、周方向に延びるリブ状である。第２抜止め突起３２ａは、第１抜止め突起２２ｂの下側に配置される。第２抜止め突起３２ａは、第１抜止め突起２２ｂに対して下側から接触可能である。第１抜止め突起２２ｂと第２抜止め突起３２ａとが上下方向に係止されることにより、外キャップ３が内キャップ２から上側に離脱することが抑制される。 The second peripheral wall 32 has a second retaining protrusion 32a.
The second retaining protrusion 32a projects from the inner peripheral surface of the second peripheral wall 32. The second retaining protrusion 32a has, for example, a rib shape extending in the circumferential direction. The second retaining protrusion 32a is arranged below the first retaining projection 22b. The second retaining protrusion 32a can come into contact with the first retaining protrusion 22b from below. By locking the first retaining protrusion 22b and the second retaining projection 32a in the vertical direction, it is possible to prevent the outer cap 3 from being detached upward from the inner cap 2.

係止突起３３は、第２頂壁３１の下面および第２周壁３２の内周面の少なくともいずれかから突出する。本実施形態では係止突起３３が、頂壁本体３５ａの下面から下側に突出し、かつ第２周壁３２の内周面から径方向内側に突出する。図１および図３に示すように、係止突起３３は、直方体状である。係止突起３３のうち、周方向を向く一対の端面および下面は、それぞれ平面状である。 The locking projection 33 projects from at least one of the lower surface of the second top wall 31 and the inner peripheral surface of the second peripheral wall 32. In the present embodiment, the locking projection 33 projects downward from the lower surface of the top wall main body 35a and radially inward from the inner peripheral surface of the second peripheral wall 32. As shown in FIGS. 1 and 3, the locking projection 33 has a rectangular parallelepiped shape. Of the locking projections 33, the pair of end faces and lower surfaces facing in the circumferential direction are planar, respectively.

係止突起３３は、開栓用突起２３の径方向位置と同じ径方向位置に配置される部分を有する。図１に示すように、内キャップ２に対して外キャップ３が押し下げられていない状態（初期状態）、つまり外キャップ３の上昇端位置においては、係止突起３３は、開栓用突起２３よりも上側に配置される。このため係止突起３３は、開栓用突起２３を周方向に通過可能である。 The locking projection 33 has a portion arranged at the same radial position as the radial position of the opening projection 23. As shown in FIG. 1, in the state where the outer cap 3 is not pushed down with respect to the inner cap 2 (initial state), that is, at the raised end position of the outer cap 3, the locking projection 33 is from the opening projection 23. Is also placed on the upper side. Therefore, the locking projection 33 can pass through the opening projection 23 in the circumferential direction.

図２に示すように、弾性片３４を弾性変形させつつ内キャップ２に対して外キャップ３を押し下げた状態、つまり外キャップ３の下降端位置において、係止突起３３の下面は、摺動リブ２５の上面と摺動自在に接触する。この外キャップ３の下降端位置において、外キャップ３を周方向の緩み側（＋θ側）に回転させることにより、係止突起３３は、周方向において開栓用突起２３と係止される（図３参照）。開栓用突起２３のうち少なくとも係止突起３３と係止される部分は、閉栓用突起２４よりも径方向外側に位置する。 As shown in FIG. 2, in a state where the outer cap 3 is pushed down against the inner cap 2 while elastically deforming the elastic piece 34, that is, at the lower end position of the outer cap 3, the lower surface of the locking projection 33 is a sliding rib. It makes slidable contact with the upper surface of 25. At the descending end position of the outer cap 3, the locking projection 33 is locked to the opening projection 23 in the circumferential direction by rotating the outer cap 3 toward the loosening side (+ θ side) in the circumferential direction (FIG. FIG. 3). At least a portion of the plugging protrusion 23 that is locked to the locking protrusion 33 is located radially outside the plugging protrusion 24.

図３に示すように、係止突起３３は、周方向に互いに間隔をあけて複数設けられる。本実施形態では、係止突起３３が周方向に等ピッチで３つ設けられる。すなわち、開栓用突起２３の数が、係止突起３３の数よりも多い。図３においては、各係止突起３３の周方向の緩み側（＋θ側）を向く端面が、各第１開栓用突起２３ａの周方向の締込み側（－θ側）を向く端面に接触している。 As shown in FIG. 3, a plurality of locking projections 33 are provided at intervals in the circumferential direction. In this embodiment, three locking projections 33 are provided at equal pitches in the circumferential direction. That is, the number of opening protrusions 23 is larger than the number of locking protrusions 33. In FIG. 3, the end face of each locking projection 33 facing the loosening side (+ θ side) in the circumferential direction contacts the end face of each first opening projection 23a facing the tightening side (−θ side) in the circumferential direction. is doing.

図３および図４に示すように、弾性片３４は、弾性変形可能な板状である。弾性片３４は、第２頂壁３１から下側に突出し、周方向に延びる。具体的に、弾性片３４は、頂壁本体３５ａの下面から下側に突出し、頂壁本体３５ａとの接続部分から周方向の締込み側（－θ側）へ向けて延びる。弾性片３４は、上下方向から見て開口部３１ａと重なって配置される。 As shown in FIGS. 3 and 4, the elastic piece 34 has an elastically deformable plate shape. The elastic piece 34 projects downward from the second top wall 31 and extends in the circumferential direction. Specifically, the elastic piece 34 projects downward from the lower surface of the top wall main body 35a and extends from the connection portion with the top wall main body 35a toward the tightening side (−θ side) in the circumferential direction. The elastic piece 34 is arranged so as to overlap the opening 31a when viewed from the vertical direction.

図１および図３に示すように、本実施形態では弾性片３４の径方向寸法つまり幅寸法が、第２頂壁３１との接続部分から離れるに従い小さくなる。弾性片３４の径方向寸法は、閉栓用突起２４の径方向寸法よりも小さい。弾性片３４は、閉栓用突起２４の径方向位置と同じ径方向位置に配置される部分を有する。本実施形態では弾性片３４全体が、閉栓用突起２４の径方向位置と同じ径方向位置に配置される。 As shown in FIGS. 1 and 3, in the present embodiment, the radial dimension, that is, the width dimension of the elastic piece 34 becomes smaller as the distance from the connection portion with the second top wall 31 increases. The radial dimension of the elastic piece 34 is smaller than the radial dimension of the plugging protrusion 24. The elastic piece 34 has a portion arranged at the same radial position as the radial position of the plugging protrusion 24. In the present embodiment, the entire elastic piece 34 is arranged at the same radial position as the radial position of the plugging protrusion 24.

図４に示すように、弾性片３４は、基端部３４ａと、中間部３４ｂと、先端部３４ｃと、を有する。なお図４は、外キャップ３が押し下げられていない状態、つまり外キャップ３の上昇端位置を表している。
基端部３４ａは、第２頂壁３１から下側に突出する。中間部３４ｂは、基端部３４ａの下端から周方向の締込み側（－θ側）に延びる。基端部３４ａおよび中間部３４ｂは、閉栓用突起２４よりも上側に位置する。先端部３４ｃは、中間部３４ｂの締込み側（－θ側）端部から下側に突出する。先端部３４ｃの上下方向の寸法は、閉栓用突起２４の上下方向の寸法よりも大きい。本実施形態では、図４に示す外キャップ３の上昇端位置において、先端部３４ｃが第１頂壁２１の上面と接触する。
また弾性片３４は、少なくとも中間部３４ｂと先端部３４ｃとの接続部分３４ｄが湾曲状である。本実施形態では、基端部３４ａと中間部３４ｂとの接続部分３４ｅも湾曲状である。このため弾性片３４は、径方向から見てＳ字状に湾曲して形成される。 As shown in FIG. 4, the elastic piece 34 has a base end portion 34a, an intermediate portion 34b, and a tip end portion 34c. Note that FIG. 4 shows a state in which the outer cap 3 is not pushed down, that is, the position of the rising end of the outer cap 3.
The base end portion 34a projects downward from the second top wall 31. The intermediate portion 34b extends from the lower end of the base end portion 34a to the tightening side (−θ side) in the circumferential direction. The base end portion 34a and the intermediate portion 34b are located above the plugging protrusion 24. The tip portion 34c projects downward from the tightening side (−θ side) end portion of the intermediate portion 34b. The vertical dimension of the tip portion 34c is larger than the vertical dimension of the plugging protrusion 24. In the present embodiment, the tip portion 34c comes into contact with the upper surface of the first top wall 21 at the rising end position of the outer cap 3 shown in FIG.
Further, in the elastic piece 34, at least the connecting portion 34d between the intermediate portion 34b and the tip portion 34c is curved. In the present embodiment, the connecting portion 34e between the base end portion 34a and the intermediate portion 34b is also curved. Therefore, the elastic piece 34 is formed by being curved in an S shape when viewed from the radial direction.

なお、弾性片３４の基端部３４ａおよび先端部３４ｃは、それぞれ、上下方向と平行に延びていてもよいし、上下方向と交差する傾斜方向に延びていてもよい。また中間部３４ｂは、上下方向と垂直な水平方向に延びていてもよいし、水平方向と交差する傾斜方向に延びていてもよい。また基端部３４ａ、中間部３４ｂおよび先端部３４ｃはそれぞれ、図４に示す縦断面視で、直線状に延びていてもよく、曲線状に延びていてもよい。本実施形態ではこの縦断面視において、基端部３４ａが周方向の緩み側（＋θ側）に凸の円弧状であり、先端部３４ｃが周方向の締込み側（－θ側）に凸の円弧状である。 The base end portion 34a and the tip end portion 34c of the elastic piece 34 may extend in parallel with the vertical direction or may extend in an inclined direction intersecting the vertical direction, respectively. Further, the intermediate portion 34b may extend in the horizontal direction perpendicular to the vertical direction, or may extend in the inclined direction intersecting the horizontal direction. Further, the base end portion 34a, the intermediate portion 34b, and the tip end portion 34c may extend linearly or curvedly in the vertical cross-sectional view shown in FIG. 4, respectively. In the present embodiment, in this vertical cross-sectional view, the base end portion 34a has an arcuate shape that is convex toward the loosening side (+ θ side) in the circumferential direction, and the tip portion 34c is convex toward the tightening side (−θ side) in the circumferential direction. It is arcuate.

先端部３４ｃは、外キャップ３を周方向の緩み側（＋θ側）に回転させた場合には、弾性片３４が弾性変形することで閉栓用突起２４を緩み側に乗り越え可能である。具体的に、外キャップ３を周方向の緩み側に回転させると、先端部３４ｃが傾斜面２４ａ上を摺動しつつ弾性片３４は弾性変形して、先端部３４ｃは閉栓用突起２４を緩み側に乗り越える。 When the outer cap 3 is rotated to the loosening side (+ θ side) in the circumferential direction, the tip portion 34c can get over the plugging protrusion 24 to the loosening side by elastically deforming the elastic piece 34. Specifically, when the outer cap 3 is rotated to the loosening side in the circumferential direction, the elastic piece 34 is elastically deformed while the tip portion 34c slides on the inclined surface 24a, and the tip portion 34c loosens the plugging protrusion 24. Get over the side.

また先端部３４ｃは、外キャップ３を周方向の締込み側（－θ側）に回転させた場合には、閉栓用突起２４に突き当てられて係止される。具体的に、外キャップ３を周方向の締込み側に回転させると、先端部３４ｃが突き当て面２４ｂに突き当てられることで、先端部３４ｃは閉栓用突起２４を乗り越え不能とされ、先端部３４ｃと閉栓用突起２４とが係止される。 Further, when the outer cap 3 is rotated to the tightening side (−θ side) in the circumferential direction, the tip portion 34c is abutted against the plugging protrusion 24 and locked. Specifically, when the outer cap 3 is rotated to the tightening side in the circumferential direction, the tip portion 34c is abutted against the abutting surface 24b, so that the tip portion 34c cannot get over the plugging protrusion 24 and the tip portion The 34c and the plugging protrusion 24 are locked.

図５は、外キャップ３が押し下げられた状態、つまり外キャップ３の下降端位置を表しており、かつ、係止突起３３と開栓用突起２３とが周方向に係止された状態（図３参照）でもある。図５に示すように、外キャップ３が押し下げられることで、弾性片３４は第１頂壁２１の上面に押し付けられて弾性変形し、弾性復元力により第２頂壁３１を上方付勢する。図５に示す状態において、弾性片３４と閉栓用突起２４とは離れて配置される。詳しくは、図３に示すように、係止突起３３と第１開栓用突起２３ａとが周方向に係止された状態において、図５に示すように閉栓用突起２４は、弾性片３４の基端部３４ａの直下に、基端部３４ａとの間に隙間をあけて配置される。 FIG. 5 shows a state in which the outer cap 3 is pushed down, that is, a state in which the lower end position of the outer cap 3 is shown, and the locking projection 33 and the opening projection 23 are locked in the circumferential direction (FIG. 5). 3). As shown in FIG. 5, when the outer cap 3 is pushed down, the elastic piece 34 is pressed against the upper surface of the first top wall 21 to be elastically deformed, and the second top wall 31 is urged upward by the elastic restoring force. In the state shown in FIG. 5, the elastic piece 34 and the plugging protrusion 24 are arranged apart from each other. Specifically, as shown in FIG. 3, in a state where the locking protrusion 33 and the first opening protrusion 23a are locked in the circumferential direction, as shown in FIG. 5, the closing protrusion 24 is an elastic piece 34. Immediately below the base end portion 34a, a gap is provided between the base end portion 34a and the base end portion 34a.

図６～図８は、前述の図３～図５とは異なる位置で、係止突起３３と開栓用突起２３とが周方向に係止される場合について説明する図である。なお図７は、外キャップ３の上昇端位置を表し、図８は、外キャップ３の下降端位置を表している。そして、図６は、係止突起３３と第２開栓用突起２３ｂとが周方向に係止された状態を表す。具体的に、図６において、各係止突起３３の周方向の緩み側（＋θ側）を向く端面は、各第２開栓用突起２３ｂの周方向の締込み側（－θ側）を向く端面に接触している。 6 to 8 are views for explaining a case where the locking projection 33 and the opening projection 23 are locked in the circumferential direction at positions different from those of FIGS. 3 to 5 described above. Note that FIG. 7 shows the position of the rising end of the outer cap 3, and FIG. 8 shows the position of the falling end of the outer cap 3. FIG. 6 shows a state in which the locking projection 33 and the second opening projection 23b are locked in the circumferential direction. Specifically, in FIG. 6, the end face of each locking projection 33 facing the loosening side (+ θ side) in the circumferential direction faces the tightening side (−θ side) of each second opening projection 23b in the circumferential direction. It is in contact with the end face.

ここで図８は、外キャップ３が押し下げられた状態であり、かつ、係止突起３３と開栓用突起２３とが周方向に係止された状態（図６参照）でもある。図８に示す状態において、弾性片３４と閉栓用突起２４とは離れて配置される。詳しくは、図６に示すように、係止突起３３と第２開栓用突起２３ｂとが周方向に係止された状態において、図８に示すように閉栓用突起２４は、弾性片３４の接続部分３４ｄの直下に、接続部分３４ｄとの間に隙間をあけて配置される。すなわち、接続部分３４ｄと閉栓用突起２４とは、上下方向に対向して配置される。 Here, FIG. 8 shows a state in which the outer cap 3 is pushed down, and the locking projection 33 and the opening projection 23 are locked in the circumferential direction (see FIG. 6). In the state shown in FIG. 8, the elastic piece 34 and the plugging protrusion 24 are arranged apart from each other. Specifically, as shown in FIG. 6, in a state where the locking protrusion 33 and the second opening protrusion 23b are locked in the circumferential direction, as shown in FIG. 8, the closing protrusion 24 is an elastic piece 34. It is arranged directly under the connection portion 34d with a gap between the connection portion 34d and the connection portion 34d. That is, the connecting portion 34d and the plugging protrusion 24 are arranged so as to face each other in the vertical direction.

図１に示すように、シール部材４は、口部１００ａの上端開口部と、第１頂壁２１の下面との間に介装される。シール部材４は、キャップ軸Ｃと垂直な方向に拡がる円板状であり、例えば弾性変形可能なパッキン等である。 As shown in FIG. 1, the seal member 4 is interposed between the upper end opening of the mouth portion 100a and the lower surface of the first top wall 21. The seal member 4 has a disk shape that extends in a direction perpendicular to the cap shaft C, and is, for example, a packing that can be elastically deformed.

以上説明した本実施形態の安全キャップ１Ａでは、キャップ開栓時においては、弾性片３４を弾性変形させつつ外キャップ３を押し下げた状態のまま周方向の緩み側（＋θ側）に回転させることで、周方向において係止突起３３と開栓用突起２３とが係止され、外キャップ３と内キャップ２とが供回り可能となり、キャップが開栓される。これに対し、例えば子供などが、外キャップ３を押し下げずに単に周方向の緩み側に回転させた場合には、弾性片３４の先端部３４ｃが閉栓用突起２４を緩み側に乗り越え、かつ周方向において係止突起３３と開栓用突起２３とが係止されないため、外キャップ３が空転してキャップは開栓されない。また、キャップ閉栓時においては、外キャップ３を押し下げずに単に周方向の締込み側（－θ側）に回転させることで、周方向において弾性片３４の先端部３４ｃと閉栓用突起２４とが係止され、外キャップ３と内キャップ２とが供回り可能となり、キャップは閉栓される。 In the safety cap 1A of the present embodiment described above, when the cap is opened, the elastic piece 34 is elastically deformed and the outer cap 3 is rotated to the loose side (+ θ side) in the circumferential direction while being pushed down. In the circumferential direction, the locking projection 33 and the opening projection 23 are locked so that the outer cap 3 and the inner cap 2 can rotate and the cap is opened. On the other hand, for example, when a child or the like simply rotates the outer cap 3 to the loosening side in the circumferential direction without pushing down, the tip portion 34c of the elastic piece 34 gets over the plugging protrusion 24 to the loosening side and turns around. Since the locking protrusion 33 and the opening protrusion 23 are not locked in the direction, the outer cap 3 slips and the cap is not opened. Further, when the cap is closed, the outer cap 3 is not pushed down but simply rotated to the tightening side (−θ side) in the circumferential direction, so that the tip portion 34c of the elastic piece 34 and the plugging protrusion 24 are brought together in the circumferential direction. It is locked so that the outer cap 3 and the inner cap 2 can rotate, and the cap is closed.

本実施形態によれば、弾性片３４の先端部３４ｃの上下方向の寸法が、閉栓用突起２４の上下方向の寸法よりも大きい。そして、外キャップ３を押し下げ、係止突起３３と開栓用突起２３とが係止された状態において、弾性片３４と閉栓用突起２４とは非接触であり互いに干渉しない。例えば本実施形態と異なり、外キャップ３を押し下げた際に、弾性片３４と閉栓用突起２４とが上下方向で干渉する構成の場合には、外キャップ３の押し下げ量が不十分となり、係止突起３３と開栓用突起２３との係止状態も不安定となって、キャップを安定して開栓できないおそれがある。一方、本実施形態によれば、このような不具合が抑えられ、特にキャップ開栓時の操作性が安定して高められる。 According to the present embodiment, the vertical dimension of the tip portion 34c of the elastic piece 34 is larger than the vertical dimension of the plugging protrusion 24. Then, in a state where the outer cap 3 is pushed down and the locking protrusion 33 and the plugging protrusion 23 are locked, the elastic piece 34 and the plugging protrusion 24 are not in contact with each other and do not interfere with each other. For example, unlike the present embodiment, when the outer cap 3 is pushed down, the elastic piece 34 and the plugging protrusion 24 interfere with each other in the vertical direction, the pushing down amount of the outer cap 3 becomes insufficient, and the outer cap 3 is locked. The locked state between the protrusion 33 and the opening protrusion 23 may also become unstable, and the cap may not be opened stably. On the other hand, according to the present embodiment, such a defect is suppressed, and in particular, the operability at the time of opening the cap is stably enhanced.

また本実施形態では、係止突起３３と開栓用突起２３（第２開栓用突起２３ｂ）とが係止された状態において、図８に示すように、弾性片３４の湾曲した接続部分３４ｄの直下に閉栓用突起２４が配置される。このため、弾性片３４と閉栓用突起２４との接触をより抑制できる。 Further, in the present embodiment, as shown in FIG. 8, in a state where the locking protrusion 33 and the opening protrusion 23 (second opening protrusion 23b) are locked, the curved connecting portion 34d of the elastic piece 34d. The plugging protrusion 24 is arranged directly under the. Therefore, the contact between the elastic piece 34 and the plugging protrusion 24 can be further suppressed.

また本実施形態では、開栓用突起２３の数が、係止突起３３の数よりも多い。
この場合、外キャップ３を押し下げた状態で周方向の緩み側（＋θ側）に回転させたときに、係止突起３３と開栓用突起２３とが係止されるまでの外キャップ３の回転量を少なく抑えることができる。このため、キャップ開栓時の操作性がより向上する。 Further, in the present embodiment, the number of the opening protrusions 23 is larger than the number of the locking protrusions 33.
In this case, when the outer cap 3 is rotated to the loose side (+ θ side) in the circumferential direction with the outer cap 3 pushed down, the outer cap 3 is rotated until the locking protrusion 33 and the opening protrusion 23 are locked. The amount can be kept small. Therefore, the operability at the time of opening the cap is further improved.

また本実施形態では、開栓用突起２３のうち少なくとも係止突起３３と係止される部分が、閉栓用突起２４よりも径方向外側に位置する。
キャップ開栓時には、外キャップ３を押し下げた状態を維持しつつ周方向の緩み側に回転させる操作が必要であり、つまり押下力および回転力が必要となる。本実施形態の上記構成によれば、係止突起３３と開栓用突起２３との係止部分が、閉栓用突起２４よりも径方向外側に配置されるため、係止突起３３および開栓用突起２３を介して、外キャップ３から内キャップ２へと効率よく回転力が伝えられる。小さな回転力でキャップを開栓でき、操作性がより向上する。 Further, in the present embodiment, at least a portion of the plugging protrusion 23 that is locked to the locking protrusion 33 is located radially outside the plugging protrusion 24.
At the time of opening the cap, it is necessary to perform an operation of rotating the outer cap 3 toward the loosening side in the circumferential direction while maintaining the pressed down state, that is, a pressing force and a rotational force are required. According to the above configuration of the present embodiment, since the locking portion between the locking protrusion 33 and the plugging protrusion 23 is arranged radially outside the plugging protrusion 24, the locking protrusion 33 and the plugging protrusion 23 are used. The rotational force is efficiently transmitted from the outer cap 3 to the inner cap 2 via the protrusion 23. The cap can be opened with a small rotational force, improving operability.

また本実施形態では、外キャップ３を押し下げたときに、係止突起３３の下面と摺動リブ２５の上面とが摺動自在に接触する。
この場合、係止突起３３の下面と摺動リブ２５の上面とを接触させることで、外キャップ３の下降端位置を位置決めでき、かつ回転動作も安定するため、キャップ開栓時の操作性がより向上する。 Further, in the present embodiment, when the outer cap 3 is pushed down, the lower surface of the locking projection 33 and the upper surface of the sliding rib 25 are slidably contacted.
In this case, by bringing the lower surface of the locking projection 33 into contact with the upper surface of the sliding rib 25, the position of the descending end of the outer cap 3 can be positioned and the rotational operation is stable, so that the operability at the time of opening the cap is improved. Improve more.

なお、外キャップ３の下降端位置において、中間部３４ｂの下面が閉栓用突起２４より上側に位置することが好ましい。この場合、外キャップ３の下降端位置において、中間部３４ｂの下面が閉栓用突起２４よりも上側に配置されるため、係止突起３３と開栓用突起２３とが係止する係止位置だけでなく、外キャップ３と内キャップ２との相対回転時においても弾性片３４と閉栓用突起２４との干渉が抑制される。 It is preferable that the lower surface of the intermediate portion 34b is located above the plugging protrusion 24 at the descending end position of the outer cap 3. In this case, at the descending end position of the outer cap 3, the lower surface of the intermediate portion 34b is arranged above the closing protrusion 24, so that only the locking position where the locking protrusion 33 and the opening protrusion 23 are locked. Not only, the interference between the elastic piece 34 and the plugging protrusion 24 is suppressed even when the outer cap 3 and the inner cap 2 rotate relative to each other.

図９は、第１実施形態の変形例の安全キャップ１Ｂの一部を拡大して示す縦断面図である。この変形例では、弾性片３４が、径方向から見てクランク状に屈曲して形成される。また先端部３４ｃの上下方向の寸法ｈは、閉栓用突起２４の上下方向の寸法よりも大きい。この変形例においても、前述した安全キャップ１Ａと同様の作用効果が得られる。 FIG. 9 is an enlarged vertical sectional view showing a part of the safety cap 1B of the modified example of the first embodiment. In this modification, the elastic piece 34 is formed by bending in a crank shape when viewed from the radial direction. Further, the vertical dimension h of the tip portion 34c is larger than the vertical dimension h of the plugging protrusion 24. Also in this modified example, the same action and effect as the above-mentioned safety cap 1A can be obtained.

＜第２実施形態＞
次に、本発明の第２実施形態の安全キャップ１Ｃについて、図１０を参照して説明する。なお第２実施形態では、主として第１実施形態と異なる構成について説明し、同一の構成についてはその説明を省略する。 <Second Embodiment>
Next, the safety cap 1C of the second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a configuration different from that of the first embodiment will be mainly described, and the description of the same configuration will be omitted.

図１０は、第２実施形態の安全キャップ１Ｃの一部を拡大して示す縦断面図である。なお図１０は、外キャップ３が押し下げられた状態、つまり外キャップ３の下降端位置を表している。
本実施形態では、内キャップ２の第１頂壁２１が、第１頂壁２１を上下方向に貫通する開口部２１ａを有する。開口部２１ａは、周方向に延びる円弧孔状である。開口部２１ａは、周方向に互いに間隔をあけて複数配置される。また本実施形態では内キャップ２が、第１頂壁２１から上側に突出し周方向に延びる弾性変形可能な弾性片２６を有する。具体的に、弾性片２６は、第１頂壁２１の上面から上側に突出し、第１頂壁２１との接続部分から周方向の緩み側（＋θ側）に向けて延びる。弾性片２６は、周方向に互いに間隔をあけて複数配置される。弾性片２６の数は、開口部２１ａの数と同じである。各弾性片２６は、上下方向から見て各開口部２１ａと重なって配置される。 FIG. 10 is an enlarged vertical sectional view showing a part of the safety cap 1C of the second embodiment. Note that FIG. 10 shows a state in which the outer cap 3 is pushed down, that is, the position of the lower end of the outer cap 3.
In the present embodiment, the first top wall 21 of the inner cap 2 has an opening 21a that penetrates the first top wall 21 in the vertical direction. The opening 21a has an arcuate shape extending in the circumferential direction. A plurality of openings 21a are arranged at intervals in the circumferential direction. Further, in the present embodiment, the inner cap 2 has an elastic piece 26 that is elastically deformable and protrudes upward from the first top wall 21 and extends in the circumferential direction. Specifically, the elastic piece 26 projects upward from the upper surface of the first top wall 21 and extends from the connection portion with the first top wall 21 toward the loose side (+ θ side) in the circumferential direction. A plurality of elastic pieces 26 are arranged at intervals in the circumferential direction. The number of elastic pieces 26 is the same as the number of openings 21a. Each elastic piece 26 is arranged so as to overlap each opening 21a when viewed from the vertical direction.

本実施形態では、外キャップ３の第２頂壁３１が、開口部３１ａを有していない。また特に図示しないが、第２頂壁３１は、上カバー３５ｂを有していなくてもよい。第２頂壁３１は、少なくとも弾性片２６および開口部２１ａを上側から覆う。また外キャップ３は、第２頂壁３１の下面から突出する閉栓用突起３６を有する。閉栓用突起３６は、周方向を向く一対の側面を有する。一対の側面のうち、周方向の緩み側（＋θ側）を向く一方の側面は、傾斜面３６ａであり、周方向の締込み側（－θ側）を向く他方の側面は、突き当て面３６ｂである。すなわち、閉栓用突起３６は、傾斜面３６ａと、突き当て面３６ｂと、を有する。傾斜面３６ａは、下側へ向かうに従い周方向の締込み側に位置する傾斜面状である。突き当て面３６ｂは、周方向と垂直な方向に拡がる平面状である。閉栓用突起３６は、周方向に互いに間隔をあけて複数設けられる。 In this embodiment, the second top wall 31 of the outer cap 3 does not have the opening 31a. Further, although not particularly shown, the second top wall 31 may not have the upper cover 35b. The second top wall 31 covers at least the elastic piece 26 and the opening 21a from above. Further, the outer cap 3 has a plugging protrusion 36 protruding from the lower surface of the second top wall 31. The closing protrusion 36 has a pair of side surfaces facing in the circumferential direction. Of the pair of side surfaces, one side facing the loosening side (+ θ side) in the circumferential direction is the inclined surface 36a, and the other side surface facing the tightening side (−θ side) in the circumferential direction is the abutting surface 36b. Is. That is, the plugging protrusion 36 has an inclined surface 36a and an abutting surface 36b. The inclined surface 36a has an inclined surface shape that is located on the tightening side in the circumferential direction toward the lower side. The abutting surface 36b has a planar shape extending in a direction perpendicular to the circumferential direction. A plurality of closing protrusions 36 are provided at intervals in the circumferential direction.

弾性片２６は、基端部２６ａと、中間部２６ｂと、先端部２６ｃと、を有する。
基端部２６ａは、第１頂壁２１から上側に突出する。中間部２６ｂは、基端部２６ａの上端から周方向の緩み側（＋θ側）に延びる。基端部２６ａおよび中間部２６ｂは、閉栓用突起３６よりも下側に位置する。先端部２６ｃは、中間部２６ｂの緩み側（＋θ側）端部から上側に突出する。先端部２６ｃの上下方向の寸法は、閉栓用突起３６の上下方向の寸法よりも大きい。 The elastic piece 26 has a base end portion 26a, an intermediate portion 26b, and a tip end portion 26c.
The base end portion 26a projects upward from the first top wall 21. The intermediate portion 26b extends from the upper end of the proximal end portion 26a to the loosening side (+ θ side) in the circumferential direction. The base end portion 26a and the intermediate portion 26b are located below the plugging protrusion 36. The tip portion 26c projects upward from the loosened side (+ θ side) end portion of the intermediate portion 26b. The vertical dimension of the tip portion 26c is larger than the vertical dimension of the plugging protrusion 36.

閉栓用突起３６は、外キャップ３を周方向の緩み側（＋θ側）に回転させた場合には、弾性片２６が弾性変形することで先端部２６ｃを緩み側に乗り越え可能である。具体的に、外キャップ３を周方向の緩み側に回転させると、先端部２６ｃが傾斜面３６ａ上を摺動しつつ弾性片２６は弾性変形して、閉栓用突起３６は先端部２６ｃを緩み側に乗り越える。 When the outer cap 3 is rotated to the loosening side (+ θ side) in the circumferential direction, the closing protrusion 36 can overcome the tip portion 26c to the loosening side by elastically deforming the elastic piece 26. Specifically, when the outer cap 3 is rotated to the loosening side in the circumferential direction, the elastic piece 26 is elastically deformed while the tip portion 26c slides on the inclined surface 36a, and the plugging protrusion 36 loosens the tip portion 26c. Get over the side.

また閉栓用突起３６は、外キャップ３を周方向の締込み側（－θ側）に回転させた場合には、先端部２６ｃに突き当てられて係止される。具体的に、外キャップ３を周方向の締込み側に回転させると、先端部２６ｃが突き当て面３６ｂに突き当てられることで、閉栓用突起３６は先端部２６ｃを乗り越え不能とされ、閉栓用突起３６と先端部２６ｃとが係止される。 Further, when the outer cap 3 is rotated to the tightening side (−θ side) in the circumferential direction, the plugging protrusion 36 is abutted against the tip portion 26c and locked. Specifically, when the outer cap 3 is rotated to the tightening side in the circumferential direction, the tip portion 26c is abutted against the abutting surface 36b, so that the closing protrusion 36 cannot get over the tip portion 26c and is used for closing. The protrusion 36 and the tip portion 26c are locked.

図１０は、外キャップ３が押し下げられた状態を表しており、かつ、特に図示しないが係止突起３３と開栓用突起２３とが周方向に係止された状態でもある。図１０に示すように、外キャップ３が押し下げられることで、弾性片２６は第２頂壁３１の下面に押し付けられて弾性変形し、弾性復元力により第２頂壁３１を上方付勢する。図１０に示す状態において、弾性片２６と閉栓用突起３６とは離れて配置される。図示の例では、閉栓用突起３６が、弾性片２６の基端部２６ａの直上に、基端部２６ａとの間に隙間をあけて配置される。 FIG. 10 shows a state in which the outer cap 3 is pushed down, and is also a state in which the locking protrusion 33 and the opening protrusion 23 are locked in the circumferential direction, although not particularly shown. As shown in FIG. 10, when the outer cap 3 is pushed down, the elastic piece 26 is pressed against the lower surface of the second top wall 31 to be elastically deformed, and the second top wall 31 is urged upward by the elastic restoring force. In the state shown in FIG. 10, the elastic piece 26 and the plugging protrusion 36 are arranged apart from each other. In the illustrated example, the plugging protrusion 36 is arranged directly above the base end portion 26a of the elastic piece 26 with a gap between the base end portion 26a and the base end portion 26a.

本実施形態においても、前述の実施形態と同様の作用効果が得られる。 Also in this embodiment, the same action and effect as those in the above-mentioned embodiment can be obtained.

なお、本発明は前述の実施形態に限定されず、例えば下記に説明するように、本発明の趣旨を逸脱しない範囲において構成の変更等が可能である。 The present invention is not limited to the above-described embodiment, and the configuration can be changed without departing from the spirit of the present invention, for example, as described below.

前述の第１実施形態では、係止突起３３が、第２頂壁３１の下面と第２周壁３２の内周面の両方から突出する例を挙げたが、これに限らない。係止突起３３は、第２頂壁３１の下面のみから突出していてもよいし、第２周壁３２の内周面のみから突出していてもよい。また係止突起３３が、周方向に互いに間隔をあけて複数設けられる例を挙げたが、これに限らず、係止突起３３は１つのみ設けられてもよい。 In the first embodiment described above, the locking projection 33 projects from both the lower surface of the second top wall 31 and the inner peripheral surface of the second peripheral wall 32, but the present invention is not limited to this. The locking projection 33 may protrude only from the lower surface of the second top wall 31, or may protrude only from the inner peripheral surface of the second peripheral wall 32. Further, although a plurality of locking projections 33 are provided at intervals in the circumferential direction, the present invention is not limited to this, and only one locking projection 33 may be provided.

前述の第１実施形態では、弾性片３４全体が、閉栓用突起２４の径方向位置と同じ径方向位置に配置される例を挙げたが、これに限らない。弾性片３４は、少なくとも先端部３４ｃの少なくとも１部の径方向位置が閉栓用突起２４の径方向位置と同じであればよく、例えば、先端部３４ｃ以外の部分の径方向位置が、閉栓用突起２４の径方向位置と異なっていてもよい。 In the above-mentioned first embodiment, an example is given in which the entire elastic piece 34 is arranged at the same radial position as the radial position of the plugging protrusion 24, but the present invention is not limited to this. The elastic piece 34 may have at least one radial position of the tip portion 34c that is the same as the radial position of the closing protrusion 24. For example, the radial position of the portion other than the tip portion 34c is the closing protrusion. It may be different from the radial position of 24.

その他、本発明の趣旨を逸脱しない範囲で、上述した実施形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、上述した実施形態および変形例を適宜組み合わせてもよい。 In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the above-described embodiments and modifications may be appropriately combined.

１Ａ，１Ｂ，１Ｃ…安全キャップ、２…内キャップ、３…外キャップ、２１…第１頂壁、２２…第１周壁、２３…開栓用突起、２４，３６…閉栓用突起、２６，３４…弾性片、２６ａ，３４ａ…基端部、２６ｂ，３４ｂ…中間部、２６ｃ，３４ｃ…先端部、３１…第２頂壁、３２…第２周壁、３３…係止突起、３４ｄ…接続部分、１００…容器、１００ａ…口部、Ｃ…キャップ軸、ｈ…寸法 1A, 1B, 1C ... Safety cap, 2 ... Inner cap, 3 ... Outer cap, 21 ... First top wall, 22 ... First peripheral wall, 23 ... Opening protrusion, 24, 36 ... Closing protrusion, 26,34 ... Elastic piece, 26a, 34a ... Base end, 26b, 34b ... Intermediate, 26c, 34c ... Tip, 31 ... Second top wall, 32 ... Second peripheral wall, 33 ... Locking protrusion, 34d ... Connection part, 100 ... container, 100a ... mouth, C ... cap shaft, h ... dimensions

Claims

An inner cap that has a ridged cylinder centered on a cap shaft that extends in the vertical direction and is attached to the mouth of the container.
It is provided with an outer cap which is a ridged cylinder covering the inner cap and is mounted so as to be rotatable in the circumferential direction around the cap axis and movable in the vertical direction with respect to the inner cap.
The inner cap is
The first top wall and
The first peripheral wall hanging from the outer peripheral portion of the first top wall and the first peripheral wall
The opening protrusion protruding from the upper surface of the first top wall,
It has a plugging protrusion protruding from the upper surface of the first top wall, and has.
The outer cap is
The second apex wall arranged above the first apex wall and
A second peripheral wall hanging from the outer peripheral portion of the second top wall and arranged radially outside the first peripheral wall,
A locking projection protruding from at least one of the lower surface of the second top wall and the inner peripheral surface of the second peripheral wall,
It has an elastic piece that is elastically deformable and protrudes downward from the second top wall and extends in the circumferential direction.
The locking protrusion has a portion arranged at the same radial position as the radial position of the opening protrusion, and can pass through the opening protrusion in the circumferential direction.
The elastic piece has a portion arranged at the same radial position as the radial position of the plugging protrusion.
The elastic piece is
The base end portion protruding downward from the second top wall and
An intermediate portion extending from the base end portion to the tightening side in the circumferential direction,
It has a tip portion that protrudes downward from the intermediate portion and has a larger vertical dimension than the plugging protrusion.
The tip is
When the outer cap is rotated to the loose side in the circumferential direction, the elastic piece is elastically deformed so that the plugging protrusion can get over the loose side.
When the outer cap is rotated to the tightening side in the circumferential direction, it is abutted against the plugging protrusion and locked.
The locking protrusion is locked to the opening protrusion in the circumferential direction by rotating the elastic piece to the loosening side in the circumferential direction while pushing down the outer cap while elastically deforming the elastic piece.
The elastic piece and the plugging protrusion are arranged apart from each other in a state where the locking protrusion and the plugging protrusion are locked.
Safety cap.

An inner cap that has a ridged cylinder centered on a cap shaft that extends in the vertical direction and is attached to the mouth of the container.
It is provided with an outer cap which is a ridged cylinder covering the inner cap and is mounted so as to be rotatable in the circumferential direction around the cap axis and movable in the vertical direction with respect to the inner cap.
The inner cap is
The first top wall and
The first peripheral wall hanging from the outer peripheral portion of the first top wall and the first peripheral wall
The opening protrusion protruding from the upper surface of the first top wall,
It has an elastic piece that protrudes upward from the first top wall and extends in the circumferential direction and is elastically deformable.
The outer cap is
The second apex wall arranged above the first apex wall and
A second peripheral wall hanging from the outer peripheral portion of the second top wall and arranged radially outside the first peripheral wall,
A locking projection protruding from at least one of the lower surface of the second top wall and the inner peripheral surface of the second peripheral wall,
It has a plugging protrusion protruding from the lower surface of the second top wall, and has.
The locking protrusion has a portion arranged at the same radial position as the radial position of the opening protrusion, and can pass through the opening protrusion in the circumferential direction.
The elastic piece has a portion arranged at the same radial position as the radial position of the plugging protrusion.
The elastic piece is
The base end portion protruding upward from the first top wall and
An intermediate portion extending from the base end portion to the loosening side in the circumferential direction,
It has a tip portion that protrudes upward from the intermediate portion and has a larger vertical dimension than the plugging protrusion.
The closing protrusion is
When the outer cap is rotated to the loose side in the circumferential direction, the elastic piece is elastically deformed so that the tip portion can get over the loose side.
When the outer cap is rotated to the tightening side in the circumferential direction, it is abutted against the tip portion and locked.
The locking protrusion is locked to the opening protrusion in the circumferential direction by rotating the elastic piece to the loosening side in the circumferential direction while pushing down the outer cap while elastically deforming the elastic piece.
The elastic piece and the plugging protrusion are arranged apart from each other in a state where the locking protrusion and the plugging protrusion are locked.
Safety cap.

The elastic piece has at least a curved connection portion between the intermediate portion and the tip portion.
In a state where the locking protrusion and the opening protrusion are locked, the connection portion and the closing protrusion are arranged so as to face each other in the vertical direction.
The safety cap according to claim 1 or 2.

A plurality of the opening protrusions are provided at intervals in the circumferential direction.
A plurality or one of the locking projections are provided at intervals in the circumferential direction.
The number of the opening protrusions is larger than the number of the locking protrusions.
The safety cap according to any one of claims 1 to 3.

At least a portion of the opening protrusion that is locked to the locking protrusion is located radially outside the closing protrusion.
The safety cap according to any one of claims 1 to 4.