JP6876474B2 - Synthetic resin container lid - Google Patents

Synthetic resin container lid Download PDF

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JP6876474B2
JP6876474B2 JP2017049865A JP2017049865A JP6876474B2 JP 6876474 B2 JP6876474 B2 JP 6876474B2 JP 2017049865 A JP2017049865 A JP 2017049865A JP 2017049865 A JP2017049865 A JP 2017049865A JP 6876474 B2 JP6876474 B2 JP 6876474B2
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lid
wall
outer lid
peripheral surface
circumferential direction
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JP2018154341A (en
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知 島田
知 島田
林　浩昭
浩昭 林
尚 杉山
尚 杉山
淳 脇島
淳 脇島
剛 大田
剛 大田
祐介 谷
祐介 谷
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Nippon Closures Co Ltd
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Description

本発明は、容器の口頸部に装着される蓋本体とこの蓋本体に装着される外蓋とから構成された合成樹脂製容器蓋に関する。 The present invention relates to a synthetic resin container lid composed of a lid main body attached to the mouth and neck of the container and an outer lid attached to the lid main body.

液体調味料の如き液体が収容されたガラス或いは合成樹脂製容器のための容器蓋として、下記特許文献１には、容器の口頸部に装着される蓋本体とこの蓋本体に装着される外蓋とから構成された合成樹脂製容器蓋が開示されている。蓋本体は上端が自由端面である円筒形状の被装着壁を含み、この被装着壁の外周面には雄螺条が形成されている。外蓋は天面壁とこの天面壁から垂下する円筒形状の装着壁とを含み、装着壁の内周面には雌螺条が形成されている。外蓋の天面壁の内面には、周方向に連続して延在する円筒形状の突起が形成されており、突起の下面によって周方向に連続して延在する肩面が規定されている。蓋本体の被装着壁に形成されている雄螺条に外蓋の装着壁に形成されている雌螺条を螺合することによって蓋本体に外蓋が装着される。蓋本体の雄螺条と外蓋の雌螺条との螺合度合は外蓋の肩面が蓋本体の被装着壁の自由端面に当接することによって規制される。 As a container lid for a glass or synthetic resin container containing a liquid such as a liquid seasoning, Patent Document 1 below describes a lid body attached to the mouth and neck of the container and an outer lid attached to the lid body. A synthetic resin container lid composed of a lid is disclosed. The lid body includes a cylindrical mounting wall whose upper end is a free end face, and a male thread is formed on the outer peripheral surface of the mounting wall. The outer lid includes a top wall and a cylindrical mounting wall that hangs down from the top wall, and a female thread is formed on the inner peripheral surface of the mounting wall. Cylindrical protrusions that extend continuously in the circumferential direction are formed on the inner surface of the top wall of the outer lid, and the lower surface of the protrusions defines a shoulder surface that extends continuously in the circumferential direction. The outer lid is attached to the lid body by screwing the female threads formed on the attachment wall of the outer lid into the male threads formed on the attachment wall of the lid body. The degree of screwing between the male thread of the lid body and the female thread of the outer lid is regulated by the shoulder surface of the outer lid abutting against the free end surface of the mounting wall of the lid body.

特許第４００５２０８号公報Japanese Patent No. 4005208

而して、本発明者等の経験によれば、上述したとおりの従来の容器蓋には、蓋本体の被装着壁の自由端面に外蓋の肩面が当接して被装着壁に押圧力が加えられると、被装着壁が上方に向かって半径方向内方に傾斜されてしまって、蓋本体の雄螺条に外蓋の雌螺条が過剰に螺合され、その結果、ネジを乗り越えて回転を生じる所謂オーバーターンが発生してしまう虞があることが判明した。 Therefore, according to the experience of the present inventors, in the conventional container lid as described above, the shoulder surface of the outer lid abuts on the free end surface of the mounted wall of the lid body, and the pressing force is applied to the mounted wall. Is added, the wall to be mounted is tilted inward in the radial direction, and the female thread of the outer lid is excessively screwed into the male thread of the lid body, and as a result, the screw is overcome. It has been found that there is a risk that a so-called overturn that causes rotation may occur.

本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、蓋本体の被装着壁が上方に向かって半径方向内方に傾斜されることが充分に防止され、従って蓋本体の雄螺条に外蓋の雌螺条が過剰に螺合されてしまうことが確実に防止される、新規且つ改良された合成樹脂製容器蓋を提供することである。 The present invention has been made in view of the above facts, and its main technical problem is that the mounted wall of the lid body is sufficiently prevented from being inclined inward in the radial direction toward the upper side, and therefore the lid body is sufficiently prevented. It is to provide a new and improved synthetic resin container lid that ensures that the female thread of the outer lid is not excessively screwed into the male thread of the outer lid.

本発明者等は鋭意研究の結果、外蓋の肩面（かかる肩面は、天面壁の内面に形成された突起に代えて外蓋の装着壁の内周面における雌螺条が形成されている部位よりも上方に形成された突起の下面によって規定することができ、そしてまた周方向に連続した突起ではなく周方向に間隔をおいて形成された突起の下面によって規定することもできる）及び／又は被装着壁の自由端面を半径方向外方に向かって上方に傾斜することによって、上記主たる技術的課題を達成することができることを見出した。 As a result of diligent research, the present inventors have formed a female thread on the inner peripheral surface of the outer lid mounting wall instead of the protrusion formed on the inner surface of the outer lid. It can be defined by the underside of the protrusions formed above the site, and also by the underside of the protrusions formed at intervals in the circumferential direction rather than continuous projections in the circumferential direction) and / Or it has been found that the above-mentioned main technical problem can be achieved by inclining the free end face of the mounted wall upward in the radial direction.

即ち、本発明によれば、上記主たる技術的課題を達成する合成樹脂製容器蓋として、容器の口頸部に装着される蓋本体と該蓋本体に装着される外蓋とから構成され、
該蓋本体は上端が自由端面である円筒形状の被装着壁を含み、該被装着壁の外周面には雄螺条が形成されており、
該外蓋は天面壁と該天面壁から垂下する円筒形状の装着壁とを含み、該装着壁の内周面には雌螺条が形成されており、該装着壁の内周面における該雌螺条が形成されている部位よりも上方又は該天面壁の内面には周方向に間隔をおいて配設された複数個の突起或いは周方向に連続して延在する突起が形成されていて、該突起の下面によって周方向に間隔をおいて或いは周方向に連続して延在する肩面が規定されており、
該蓋本体の該被装着壁に形成されている該雄螺条に該外蓋の該装着壁に形成されている該雌螺条を螺合し、該外蓋の該肩面を該被装着壁の該自由端面に当接することによって該蓋本体に該外蓋が装着される合成樹脂製容器蓋において、
該外蓋の該肩面及び／又は該蓋本体の該被装着壁の該自由端面は、半径方向外方に向かって上方に傾斜しており、
該蓋本体の該被装着壁の該自由端面に該外蓋の該肩面が当接して該被装着壁に押圧力が加えられると、該被装着壁には上方に向かって半径方向外側に向けて力が加えられる、
ことを特徴とする合成樹脂製容器蓋が提供される。 That is, according to the present invention, the synthetic resin container lid that achieves the above-mentioned main technical problem is composed of a lid main body attached to the mouth and neck of the container and an outer lid attached to the lid main body.
The lid body includes a cylindrical mounted wall having a free end face at the upper end, and a male thread is formed on the outer peripheral surface of the mounted wall.
The outer lid includes a top wall and a cylindrical mounting wall hanging from the top wall, and a female screw is formed on the inner peripheral surface of the mounting wall, and the female on the inner peripheral surface of the mounting wall. A plurality of protrusions arranged at intervals in the circumferential direction or protrusions extending continuously in the circumferential direction are formed above the portion where the spiral is formed or on the inner surface of the top wall. , it is defined shoulder surface extending continuously protruding to the lower surface or the circumferential direction at intervals in the circumferential direction by the electromotive force,
The female screw formed on the mounting wall of the outer lid is screwed into the male screw formed on the mounted wall of the lid body, and the shoulder surface of the outer lid is mounted. In a synthetic resin container lid in which the outer lid is attached to the lid body by abutting on the free end face of the wall.
The shoulder surface of the outer lid and / or the free end surface of the mounted wall of the lid body is inclined upward in the radial direction .
When the shoulder surface of the outer lid abuts on the free end surface of the mounted wall of the lid body and a pressing force is applied to the mounted wall, the mounted wall is radially outwardly outward. Power is applied toward
A synthetic resin container lid is provided.

好ましくは、該外蓋の該肩面及び／又は該被装着壁の該自由端面は水平に対して５乃至３０度の傾斜角度で傾斜している。該外蓋の該装着壁の該内周面には、該雌螺条よりも上方で且つ該肩面よりも下方に位置し、周方向に間隔をおいて配設された複数個の突条或いは周方向に連続して延びる突条が形成されており、該突条の内径は該突起の内径よりも大きく、該蓋本体に該外蓋が装着されると、該突条の内面は該蓋本体の該被装着壁の外周面上端部の、該雄螺条が存在しない部位の外周面に対して間隔をおいて対向する形態が好ましい。 Preferably, the shoulder surface of the outer lid and / or the free end surface of the mounted wall is inclined at an inclination angle of 5 to 30 degrees with respect to the horizontal. On the inner peripheral surface of the mounting wall of the outer lid, a plurality of protrusions located above the female thread and below the shoulder surface and arranged at intervals in the circumferential direction. Alternatively, a ridge extending continuously in the circumferential direction is formed, the inner diameter of the ridge is larger than the inner diameter of the protrusion, and when the outer lid is attached to the lid body, the inner surface of the ridge becomes the same. It is preferable that the upper end of the outer peripheral surface of the wall to be mounted of the lid body faces the outer peripheral surface of the portion where the male screw does not exist at a distance .

本発明の合成樹脂製容器蓋によれば、蓋本体の被装着壁の自由端面に外蓋の肩面が当接して被装着壁に押圧力が加えられると、外蓋の肩面及び／又は蓋本体の被装着壁の自由端面は半径方向外方に向かって上方に傾斜している故に、被装着壁には上方に向かって半径方向内側ではなく半径方向外側に向けて力が加えられる。容器蓋における種々の構成上の制約等によって、被装着壁の上方に向かって半径方向内方への傾動を規制することは必ずしも容易ではないが、被装着壁の上方に向かって半径方向外方への傾動は、外蓋の装着壁の内周面に突条を配設する等によって充分容易に規制することができる。かくして、本発明の合成樹脂製容器蓋によれば、外蓋の雌螺条が蓋本体の雄螺条に過剰に螺合されてしまうことが充分確実に防止される。 According to the synthetic resin container lid of the present invention, when the shoulder surface of the outer lid comes into contact with the free end surface of the mounted wall of the lid body and a pressing force is applied to the mounted wall, the shoulder surface of the outer lid and / or Since the free end face of the mounted wall of the lid body is inclined upward in the radial direction, the force is applied to the mounted wall upward not in the radial direction but in the radial direction. Due to various structural restrictions on the container lid, it is not always easy to regulate the inward tilt in the radial direction toward the upper side of the mounted wall, but the radial outward direction toward the upper side of the mounted wall. The tilting toward can be sufficiently easily regulated by disposing a ridge on the inner peripheral surface of the mounting wall of the outer lid. Thus, according to the synthetic resin container lid of the present invention, it is sufficiently surely prevented that the female thread of the outer lid is excessively screwed into the male thread of the lid body.

本発明に従って構成された合成樹脂製容器蓋の好適実施形態を容器の口頸部に装着した状態において、一部を断面で示す正面図。The front view which shows a part in the cross section in the state which the preferable embodiment of the synthetic resin container lid constructed according to this invention is attached to the mouth neck part of a container. 図１に示す合成樹脂製容器蓋における外蓋の断面図。FIG. 3 is a cross-sectional view of the outer lid of the synthetic resin container lid shown in FIG. 図１に示す合成樹脂製容器蓋における外蓋の底面図。The bottom view of the outer lid in the synthetic resin container lid shown in FIG.

以下、本発明に従って構成された容器蓋の好適実施形態を図示している添付図面を参照して、更に詳細に説明する。 Hereinafter, the description will be made in more detail with reference to the accompanying drawings illustrating preferred embodiments of the container lid configured according to the present invention.

本発明に従って構成された、全体を番号２で示す容器蓋は蓋本体４及び外蓋６から構成されている。蓋本体４はポリエチレンの如き比較的軟質合成樹脂から射出成型することができ、外蓋６は高密度ポリエチレン又はポリプロピレンの如き比較的硬質合成樹脂から射出成形することができる。 The container lid, which is configured according to the present invention and is indicated by No. 2, is composed of a lid main body 4 and an outer lid 6. The lid body 4 can be injection molded from a relatively soft synthetic resin such as polyethylene, and the outer lid 6 can be injection molded from a relatively hard synthetic resin such as high density polyethylene or polypropylene.

図１を参照して説明すると、蓋本体４は閉塞壁８と、この閉塞壁８の外周縁から垂下する円筒形状の側壁１０とを備えている。閉塞壁８には軸方向に見て比較的上方に位置する円形中央領域８ａと、軸方向に見て比較的下方に位置する円環形外周領域８ｂとが区画されている。閉塞壁８の中央領域８ａには円環形状の破断可能ライン１２によって規定された円形排出開口形成領域１４が設けられている。閉塞壁８の上面には、外周領域８ｂの半径方向略中間位置において上方に延出し且つ上端が自由端面である円筒形状の被装着壁１６と、外周領域８ｂの半径方向内側縁部において上方に延出する円筒形状の注出壁１８と、中央領域８ａ（更に詳しくは排出開口形成領域１４）の中央部において上方に延出する円筒形状の被係止壁２０とが形成されている。被装着壁１６の外周面には雄螺条２２が形成されている。注出壁１８の上端部は半径方向外方にカールせしめられている。注出壁１８の延出高さは被装着壁１６及び被係止壁２０の延出高さよりも高い。被係止壁２０の上端には実質上水平な円形壁部２４が設けられている。被係止壁２０の外周面の上端部には、周方向に連続して延在し且つ半径方向外方に突出する第一の被係止突条２６と、この第一の被係止突条２６よりも幾分下方において周方向に連続して延在し且つ半径方向外方に突出する補助突条２８とが配設されている。被係止壁２０の外周面における補助突条２８の下方には、第一の周方向被係止手段３０が配設されている。図示は省略するが、第一の周方向被係止手段３０は周方向に等角度間隔をおいて６個配設されている。第一の周方向被係止手段３０については後に言及する。被係止壁２０の内周面には軸線方向に延びるリブ３２が周方向に等角度間隔をおいて複数個形成されている。リブ３２は、蓋本体４に外蓋６を装着する際に所定の治具と協働して外蓋６に対する蓋本体４の回転を規制することを可能とする。 Explaining with reference to FIG. 1, the lid main body 4 includes a closing wall 8 and a cylindrical side wall 10 hanging from the outer peripheral edge of the closing wall 8. The closed wall 8 is divided into a circular central region 8a located relatively upward in the axial direction and an annular outer peripheral region 8b located relatively downward in the axial direction. The central region 8a of the closed wall 8 is provided with a circular discharge opening forming region 14 defined by a ring-shaped breakable line 12. On the upper surface of the closed wall 8, a cylindrical mounted wall 16 extending upward at a substantially intermediate position in the radial direction of the outer peripheral region 8b and having a free end surface at the upper end, and an upward radial inner edge portion of the outer peripheral region 8b. A cylindrical pouring wall 18 extending upward and a cylindrical locked wall 20 extending upward in the central portion of the central region 8a (more specifically, the discharge opening forming region 14) are formed. A male screw 22 is formed on the outer peripheral surface of the mounted wall 16. The upper end of the injection wall 18 is curled outward in the radial direction. The extension height of the injection wall 18 is higher than the extension height of the mounted wall 16 and the locked wall 20. A substantially horizontal circular wall portion 24 is provided at the upper end of the locked wall 20. At the upper end of the outer peripheral surface of the locked wall 20, a first locked ridge 26 extending continuously in the circumferential direction and protruding outward in the radial direction, and the first locked protrusion 26 Auxiliary ridges 28, which extend continuously in the circumferential direction and project outward in the radial direction, are arranged slightly below the ridge 26. A first circumferential locked means 30 is arranged below the auxiliary ridge 28 on the outer peripheral surface of the locked wall 20. Although not shown, six first circumferential locking means 30 are arranged at equal angular intervals in the circumferential direction. The first circumferentially locked means 30 will be described later. A plurality of ribs 32 extending in the axial direction are formed on the inner peripheral surface of the locked wall 20 at equal angular intervals in the circumferential direction. The rib 32 makes it possible to regulate the rotation of the lid main body 4 with respect to the outer lid 6 in cooperation with a predetermined jig when the outer lid 6 is attached to the lid main body 4.

図１を参照して説明を続けると、閉塞壁８の下面における外周領域８ｂには、その半径方向略中間位置において下方に延出する環状シール壁３４と、半径方向内側端部に位置するラチェット凹部３６とが形成されている。ラチェット凹部３６はそれ自体周知の構成であり、蓋本体４に外蓋６を装着する際に所定の治具と協働して外蓋６に対する蓋本体４の回転を規制することを可能とする（特開２００８−２７３５３１号公報を参照されたい）。閉塞壁８の下面の中央領域８ａには、破断可能ライン１２の半径方向内側において閉塞壁８の下面に接続された基端から半径方向外方に向かって下方に傾斜して延出し、延出端は半径方向において破断可能ライン１２よりも外方に位置する環状シール片３８も形成されている。シール片３８は比較的肉薄であり弾性的に変形することが可能である。 Continuing the description with reference to FIG. 1, in the outer peripheral region 8b on the lower surface of the closed wall 8, an annular seal wall 34 extending downward at a substantially intermediate position in the radial direction and a ratchet located at the inner end in the radial direction. A recess 36 is formed. The ratchet recess 36 has a well-known configuration itself, and when the outer lid 6 is attached to the lid main body 4, it is possible to regulate the rotation of the lid main body 4 with respect to the outer lid 6 in cooperation with a predetermined jig. (Refer to JP-A-2008-273531). The central region 8a of the lower surface of the closed wall 8 is extended and extended radially outward from the base end connected to the lower surface of the closed wall 8 on the radial inside of the breakable line 12. An annular seal piece 38 located at the end outside the breakable line 12 in the radial direction is also formed. The seal piece 38 is relatively thin and can be elastically deformed.

側壁１０の外周面の上端部には、周方向に連続して延在し且つ半径方向外方に突出する第二の被係止突条４０が配設されている。側壁１０の外周面の下端部には、第二の周方向被係止手段４２が配設されている。図示は省略するが、第二の周方向被係止手段４２は周方向に等角度間隔をおいて複数配設されている。第二の周方向被係止手段４２については後に言及する。側壁１０の内周面の下端部には、半径方向内方に突出する係止突条４４が配設されている。 At the upper end of the outer peripheral surface of the side wall 10, a second locked ridge 40 that extends continuously in the circumferential direction and projects outward in the radial direction is arranged. A second circumferential locking means 42 is provided at the lower end of the outer peripheral surface of the side wall 10. Although not shown, a plurality of second circumferential locking means 42 are arranged at equal angular intervals in the circumferential direction. The second circumferentially locked means 42 will be described later. At the lower end of the inner peripheral surface of the side wall 10, a locking ridge 44 protruding inward in the radial direction is arranged.

図１と共に図２及び図３を参照して説明を続けると、外蓋６は円形天面壁４６と、この天面壁４６の外周縁から垂下する円筒形状のスカート壁４８とを備えている。天面壁４６の内面には、その外周縁部において下方に垂下する円筒形状の装着壁５０、及び中央領域において下方に垂下する円筒形状の係止壁５２が形成されている。天面壁４６の内面には、半径方向に見て装着壁５０と係止壁５２との間において下方に垂下する筒状液留め片５４、及び半径方向に見て液留め片５４と係止壁５２との間において下方に垂下する筒状補助シール片５６も形成されている。装着壁５０の内周面の下端部には雌螺条５８が配設されている。装着壁５０の内周面における雌螺条５８が形成されている部位よりも上方には周方向に間隔をおいて配設された複数個（図示の実施形態においては６個）の突起６０が形成されていて、突起６０の下端には周方向に間隔をおいて肩面６２が規定されている。図示の実施形態においては、夫々の突起６０は天面壁４６の内面から鉛直下方に延び、その下端部を除く主部の横断面形状は矩形である。所望ならば、上記突起を装着壁５０の内周面における雌螺条５８が形成されている部位よりも上方に位置することに代えて、（装着壁５０の内周面から半径方向内方に幾分離隔して）天面壁４６の内面に形成するようにしてもよい。また、上記突起を周方向に間隔をおいて複数個配設することに代えて、周方向に連続して延在させるようにしてもよい。上記突起を周方向に連続して延在させるようにした場合には、上記肩面も周方向に連続して延在するように規定される。 Continuing the description with reference to FIGS. 2 and 3 together with FIG. 1, the outer lid 6 includes a circular top wall 46 and a cylindrical skirt wall 48 hanging from the outer peripheral edge of the top wall 46. On the inner surface of the top wall 46, a cylindrical mounting wall 50 that hangs downward at the outer peripheral edge thereof and a cylindrical locking wall 52 that hangs downward at the central region are formed. On the inner surface of the top wall 46, a tubular liquid retaining piece 54 that hangs downward between the mounting wall 50 and the locking wall 52 when viewed in the radial direction, and the liquid retaining piece 54 and the locking wall when viewed in the radial direction. A tubular auxiliary seal piece 56 that hangs downward from the 52 is also formed. A female screw 58 is arranged at the lower end of the inner peripheral surface of the mounting wall 50. Above the portion of the inner peripheral surface of the mounting wall 50 where the female threads 58 are formed, a plurality of (six in the illustrated embodiment) protrusions 60 are arranged at intervals in the circumferential direction. A shoulder surface 62 is defined at the lower end of the protrusion 60 at intervals in the circumferential direction. In the illustrated embodiment, each of the protrusions 60 extends vertically downward from the inner surface of the top wall 46, and the cross-sectional shape of the main portion excluding the lower end thereof is rectangular. If desired, instead of locating the protrusion above the portion of the inner peripheral surface of the mounting wall 50 where the female threads 58 are formed, (inward in the radial direction from the inner peripheral surface of the mounting wall 50). It may be formed on the inner surface of the top wall 46 (with some separation). Further, instead of arranging a plurality of the protrusions at intervals in the circumferential direction, the protrusions may be continuously extended in the circumferential direction. When the protrusions are made to extend continuously in the circumferential direction, the shoulder surface is also defined to be continuously extended in the circumferential direction.

本発明にかかる容器蓋２においては、外蓋６の肩面６２及び／又は蓋本体４の被装着壁１６の自由端面が、半径方向外方に向かって上方に傾斜していることが重要である。そして、外蓋６の肩面６２及び／又は被装着壁１６の自由端面は水平に対して５乃至３０度の傾斜角度で傾斜しているのが好ましい。図示の実施形態においては、外蓋６の肩面６２が半径方向外方に向かって上方に１０度傾斜している。装着壁５０の内周面であって且つ夫々の肩面６２の半径方向外側端部には、肩面６２から下方に延び縦断面形状が矩形である突条６４が形成されている（換言すると、装着壁５０の内周面には、雌螺条５８よりも上方で且つ肩面６２よりも下方の位置において、周方向に間隔をおいて配設された複数個の突条６４が形成されているおり、この突条６４の外径は突起６０の内径よりも大きい）。所望ならば、上記突条を周方向に間隔をおいて複数個配設することに代えて、周方向に連続して延びるようにしてもよい。 In the container lid 2 according to the present invention, it is important that the shoulder surface 62 of the outer lid 6 and / or the free end surface of the mounted wall 16 of the lid body 4 is inclined upward in the radial direction. is there. The shoulder surface 62 of the outer lid 6 and / or the free end surface of the mounted wall 16 is preferably inclined at an inclination angle of 5 to 30 degrees with respect to the horizontal. In the illustrated embodiment, the shoulder surface 62 of the outer lid 6 is inclined upward by 10 degrees in the radial direction outward. On the inner peripheral surface of the mounting wall 50 and at the radial outer end of each shoulder surface 62, a ridge 64 extending downward from the shoulder surface 62 and having a rectangular vertical cross-sectional shape is formed (in other words,). On the inner peripheral surface of the mounting wall 50, a plurality of ridges 64 arranged at intervals in the circumferential direction are formed at positions above the female screw 58 and below the shoulder surface 62. The outer diameter of the ridge 64 is larger than the inner diameter of the protrusion 60). If desired, instead of arranging a plurality of the ridges at intervals in the circumferential direction, they may extend continuously in the circumferential direction .

図２及び図３を参照して説明を続けると、係止壁５２の内周面の下端部には、周方向に連続して延在し且つ半径方向内方に突出する第一の係止突条６６が配設されている。係止壁５２の内周面における第一の係止突条６６の下方には、第一の周方向係止手段６８が配設されている。図３を参照することによって明確に理解されるとおり、第一の周方向係止手段６８は周方向に等角度間隔をおいて６個配設されており、第一の周方向係止手段６８の各々は蓋本体４に配設された第一の周方向被係止手段３０の各々と協働する。即ち、蓋本体４に対して外蓋６が時計方向に回転する際には、外蓋６に設けられた第一の周方向係止手段６８は蓋本体４に設けられた第一の周方向被係止手段３０を弾性的に乗り越えるが、蓋本体４に対して外蓋６が反時計方向に回転する際には、外蓋６に設けられた第一の周方向係止手段６８は蓋本体４に設けられた第一の周方向被係止手段３０によって規制される。 Continuing the description with reference to FIGS. 2 and 3, the first locking that extends continuously in the circumferential direction and projects inward in the radial direction at the lower end of the inner peripheral surface of the locking wall 52. A ridge 66 is arranged. A first circumferential locking means 68 is disposed below the first locking ridge 66 on the inner peripheral surface of the locking wall 52. As is clearly understood by referring to FIG. 3, six first circumferential locking means 68 are arranged at equal angular intervals in the circumferential direction, and the first circumferential locking means 68 is arranged. Each of the above cooperates with each of the first circumferentially locked means 30 arranged on the lid main body 4. That is, when the outer lid 6 rotates clockwise with respect to the lid main body 4, the first circumferential locking means 68 provided on the outer lid 6 is provided on the lid main body 4 in the first circumferential direction. The locked means 30 is elastically overcome, but when the outer lid 6 rotates counterclockwise with respect to the lid main body 4, the first circumferential locking means 68 provided on the outer lid 6 is a lid. It is regulated by the first circumferentially locked means 30 provided on the main body 4.

スカート壁４８の下端部には周方向に延びる破断可能ライン７０が形成されており、スカート壁４８は破断可能ライン７０よりも上方の主部４８ａと破断可能ライン７０よりも下方のタンパーエビデント裾部４８ｂとに区画される。軸線方向に見て、破断可能ライン７０は、装着壁５０の下端と同一或いはこれよりも下方に位置するのが好ましい。スカート壁４８における主部４８ａの外周面には掛けられる指の滑りを防止するためのナール（凹凸形状）７２が形成されている。タンパーエビデント裾部４８ｂの内周面の上端部には、周方向に連続して延在し且つ半径方向内方に突出する第二の係止突条７４が配設されている。タンパーエビデント裾部４８ｂの内周面の下端部には、第二の周方向係止手段７６が配設されている。図３を参照することによって明確に理解されるとおり、第二の周方向係止手段７６は周方向に等角度間隔をおいて多数配設されており、第二の周方向係止手段７６の各々は蓋本体６に配設された第二の周方向被係止手段４２の各々と協働する。即ち、蓋本体４に対して外蓋６が時計方向に回転する際には、外蓋６に設けられた第二の周方向係止手段７６は蓋本体４に設けられた第二の周方向被係止手段４２を弾性的に乗り越えるが、蓋本体４に対して外蓋６が反時計方向に回転する際には、外蓋６に設けられた第二の周方向係止手段７６は蓋本体４に設けられた第二の周方向被係止手段４２によって規制される。 A breakable line 70 extending in the circumferential direction is formed at the lower end of the skirt wall 48, and the skirt wall 48 has a main portion 48a above the breakable line 70 and a tamper evidence hem below the breakable line 70. It is divided into parts 48b. When viewed in the axial direction, the breakable line 70 is preferably located at the same level as or below the lower end of the mounting wall 50. A knurl (concave and convex shape) 72 is formed on the outer peripheral surface of the main portion 48a of the skirt wall 48 to prevent the fingers from slipping. A second locking ridge 74 that extends continuously in the circumferential direction and projects inward in the radial direction is disposed at the upper end of the inner peripheral surface of the tamper evidence hem portion 48b. A second circumferential locking means 76 is provided at the lower end of the inner peripheral surface of the tamper evidence hem 48b. As is clearly understood by referring to FIG. 3, a large number of the second circumferential locking means 76 are arranged at equal angular intervals in the circumferential direction, and the second circumferential locking means 76 Each cooperates with each of the second circumferentially locked means 42 disposed on the lid body 6. That is, when the outer lid 6 rotates clockwise with respect to the lid main body 4, the second circumferential locking means 76 provided on the outer lid 6 is provided on the lid main body 4 in the second circumferential direction. The locked means 42 is elastically overcome, but when the outer lid 6 rotates counterclockwise with respect to the lid main body 4, the second circumferential locking means 76 provided on the outer lid 6 is a lid. It is regulated by the second circumferentially locked means 42 provided on the main body 4.

上述したとおりの蓋本体４と外蓋６とは、蓋本体４に外蓋６を被嵌した状態で蓋本体４に対して外蓋６を上方から見て時計方向に回転し、蓋本体４の雄螺条２２に外蓋６の雌螺条５８を螺合せしめることによって相互に組み合わされる。この際には、上述したとおり蓋本体４のリブ３２及びラチェット凹部３６に所定の治具を作用させて、外蓋６に対する蓋本体４の回転を規制した状態で行われる。蓋本体４に対して外蓋６を上記方向に回転せしめて外蓋６が蓋本体４に対して降下する際には、上述したとおり、外蓋６における第一の周方向係止手段６８は蓋本体４における第一の周方向被係止手段３０を弾性的に乗り越えると共に、外蓋６における第二の周方向係止手段７６も蓋本体４における第二の周方向被係止手段４２を弾性的に乗り越える。従って蓋本体４に対する外蓋６の回転が第一の周方向係止手段３０と第一の周方向被係止手段６８との共働及び第二の周方向係止手段７６と第二の周方向被係止手段４２との共働によって規制されることはない。蓋本体４の雄螺条２２に外蓋６の雌螺条５８を螺合せしめて蓋本体４と外蓋６とが組み合わされる際には更に、外蓋６の係止壁５２に配設されている第一の係止突条６６が蓋本体４の被係止壁２０に配設されている第一の係止突条２６を弾性的に乗り越えてこれの下方に係止され、さらに、外蓋６のスカート壁４８に配設されている第二の係止突条７４が蓋本体４の側壁１０に配設されている第二の係止突条４０を弾性的に乗り越えてこれの下方に係止される。外蓋６は、その装着壁５０に形成された肩面６２が蓋本体４の被装着壁１６の自由端面に当接するまで蓋本体４に対して回転せしめられ、かくして外蓋６は蓋本体４に装着される。外蓋６が蓋本体４に装着された状態にあっては、図１に示すとおり、外蓋６の補助シール片５６の外周面が蓋本体４の注出壁１８の上端部の内周面に密着する。また、突条６４の内面は蓋本体４の被装着壁１６の外周面上端部の雄螺条２２が存在しない部位の外周面に対して間隔をおいて対向する（突条を外蓋６の装着壁５０の内周面に形成することに代えて、蓋本体４の被装着壁１６の外周面上端部の、雄螺条２２が存在しない部位の外周面に形成した場合には、蓋本体４に外蓋６が装着されると、突条の外面は外蓋６の装着壁５０の内周面における肩面６２よりも下方で且つ雌螺条５８よりも上方の部位に対して間隔をおいて対向することとなる）。 As described above, the lid main body 4 and the outer lid 6 rotate clockwise with respect to the lid main body 4 with the outer lid 6 fitted to the lid main body 4, and the lid main body 4 The male threads 22 of the outer lid 6 are combined with each other by screwing the female threads 58 of the outer lid 6. At this time, as described above, a predetermined jig is applied to the rib 32 and the ratchet recess 36 of the lid main body 4 to regulate the rotation of the lid main body 4 with respect to the outer lid 6. When the outer lid 6 is rotated in the above direction with respect to the lid main body 4 and the outer lid 6 descends with respect to the lid main body 4, as described above, the first circumferential locking means 68 in the outer lid 6 is used. The first circumferential locking means 30 in the lid body 4 is elastically overcome, and the second circumferential locking means 76 in the outer lid 6 also uses the second circumferential locking means 42 in the lid body 4. Overcome elastically. Therefore, the rotation of the outer lid 6 with respect to the lid body 4 cooperates with the first circumferential locking means 30 and the first circumferential locking means 68, and the second circumferential locking means 76 and the second circumference. It is not regulated by the cooperation with the directional locking means 42. When the female thread 58 of the outer lid 6 is screwed into the male thread 22 of the lid body 4 and the lid body 4 and the outer lid 6 are combined, the female thread 58 of the outer lid 6 is further arranged on the locking wall 52 of the outer lid 6. The first locking ridge 66 elastically overcomes the first locking ridge 26 disposed on the locked wall 20 of the lid body 4 and is locked below the first locking ridge 26, and further outside. The second locking ridge 74 disposed on the skirt wall 48 of the lid 6 elastically overcomes the second locking ridge 40 disposed on the side wall 10 of the lid body 4 and is below the second locking ridge 40. Locked to. The outer lid 6 is rotated with respect to the lid body 4 until the shoulder surface 62 formed on the mounting wall 50 abuts on the free end surface of the mounted wall 16 of the lid body 4, and thus the outer lid 6 is the lid body 4. It is attached to. When the outer lid 6 is attached to the lid main body 4, as shown in FIG. 1, the outer peripheral surface of the auxiliary seal piece 56 of the outer lid 6 is the inner peripheral surface of the upper end portion of the ejection wall 18 of the lid main body 4. Adhere to. Further, the inner surface of the ridge 64 faces the outer peripheral surface of the outer peripheral surface of the outer peripheral surface 16 of the lid main body 4 at a distance where the male screw 22 does not exist (the ridge is the outer lid 6). When it is formed on the outer peripheral surface of the outer peripheral surface of the mounted wall 16 of the lid main body 4 where the male screw 22 does not exist, instead of being formed on the inner peripheral surface of the mounting wall 50, the lid main body is formed. When the outer lid 6 is attached to 4, the outer surface of the ridge is spaced below the shoulder surface 62 and above the female thread 58 on the inner peripheral surface of the outer lid 6 mounting wall 50. Will face each other).

本発明の合成樹脂製容器蓋によれば、蓋本体４の被装着壁１６の自由端面に外蓋６の肩面６２が当接して被装着壁１６に押圧力が加えられると、外蓋６の肩面６２及び／又は蓋本体４の被装着壁１６の自由端面は半径方向外方に向かって上方に傾斜している故に、被装着壁１６には上方に向かって半径方向内側ではなく半径方向外側に向けて力が加えられる。容器蓋における種々の構成上の制約等によって、被装着壁１６の上方に向かって半径方向内方への傾動を規制することは必ずしも容易ではないが、被装着壁１６の上方に向かって半径方向外方への傾動は、外蓋６の装着壁５０の内周面に突条６４を配設する等によって充分容易に規制することができる。かくして、本発明の合成樹脂製容器蓋によれば、外蓋６の雌螺条５８が蓋本体４の雄螺条２２に過剰に螺合されてしまうことが充分確実に防止される。 According to the synthetic resin container lid of the present invention, when the shoulder surface 62 of the outer lid 6 comes into contact with the free end surface of the mounted wall 16 of the lid main body 4 and a pressing force is applied to the mounted wall 16, the outer lid 6 Since the free end surface of the shoulder surface 62 and / or the mounted wall 16 of the lid body 4 is inclined upward in the radial direction, the mounted wall 16 has a radius rather than a radial inward toward the upward direction. The force is applied outward in the direction. It is not always easy to regulate the inward tilt in the radial direction toward the upper side of the mounted wall 16 due to various structural restrictions on the container lid, but the radial direction toward the upper side of the mounted wall 16. The outward tilt can be sufficiently easily regulated by disposing a ridge 64 on the inner peripheral surface of the mounting wall 50 of the outer lid 6. Thus, according to the synthetic resin container lid of the present invention, it is sufficiently surely prevented that the female screw 58 of the outer lid 6 is excessively screwed into the male screw 22 of the lid main body 4.

上記のとおりに組み合わされた容器蓋２は、図１において二点鎖線で示す容器の口頸部７８に対して図１に示す状態まで強制的に下降せしめることによって容器の口頸部７８に装着される。かくすると、蓋本体４における側壁１０の内周面に形成されている係止突条４４が口頸部７８の外周面に形成されている係止あご部８０を弾性的に乗り越えてこれに係止せしめられ、蓋本体４が口頸部７８に固着される。また、蓋本体４のシール壁３４が口頸部７８内に進入せしめられ、これによって口頸部７８が密封される。 The container lid 2 combined as described above is attached to the mouth and neck 78 of the container by forcibly lowering the mouth and neck 78 of the container shown by the alternate long and short dash line in FIG. 1 to the state shown in FIG. Will be done. In this way, the locking ridge 44 formed on the inner peripheral surface of the side wall 10 of the lid body 4 elastically overcomes the locking jaw portion 80 formed on the outer peripheral surface of the mouth neck 78 and engages with this. It is stopped and the lid body 4 is fixed to the mouth and neck 78. Further, the seal wall 34 of the lid body 4 is inserted into the mouth and neck 78, whereby the mouth and neck 78 is sealed.

容器の内容物を消費する際には、外蓋６のスカート壁４８に指を掛けて、蓋本体４に装着されている外蓋６を上方から見て反時計方向に回転する。蓋本体４に対して外蓋６を上記方向に回転すると、外蓋６の装着壁５０に形成されている雌螺条５８と蓋本体４に形成されている雄螺条２２との螺合が解除されて蓋本体４に対して外蓋６が上昇せしめられる。このとき、外蓋６の係止壁５２に配設されている第一の係止突条６６が蓋本体４の被係止壁２０に配設されている第一の被係止突条２６に係止して蓋本体４に対する外蓋６の上昇が規制されると共に、外蓋６の係止壁５２に配設されている第一の周方向係止手段６８が蓋本体４の被係止壁２０に配設されている第一の周方向被係止手段３０に係止して蓋本体４に対する外蓋６の回転が規制される。従って、外蓋６を更に蓋本体４に対して上記方向に回転せしめると、第一の係止突条６６及び第一の被係止突条２６と、第一の周方向係止手段６８及び第一の周方向被係止手段３０とを介して閉塞壁８に設けられた破断可能ライン１２に応力が伝えられこれに集中し、かかる力によって破断可能ライン１２が破断され、排出開口が形成される。破断可能ライン１２が破断して蓋本体４の閉塞壁８に排出開口が形成された後、外蓋６を蓋本体４に対して上記方向に更に回転せしめると、排出開口形成領域１４が閉塞壁８のその他の部分から分離され外蓋６と共に排出開口形成領域１４が蓋本体４に対して上昇する。排出開口形成領域１４が閉塞壁８のその他の部分から除去される際にはシール片３８は弾性的に撓んで上記その他の部分より上方に移動する。 When consuming the contents of the container, a finger is hung on the skirt wall 48 of the outer lid 6 and the outer lid 6 attached to the lid main body 4 is rotated counterclockwise when viewed from above. When the outer lid 6 is rotated in the above direction with respect to the lid main body 4, the female screw 58 formed on the mounting wall 50 of the outer lid 6 and the male screw 22 formed on the lid main body 4 are screwed together. It is released and the outer lid 6 is raised with respect to the lid main body 4. At this time, the first locking ridge 66 disposed on the locking wall 52 of the outer lid 6 is disposed on the locked wall 20 of the lid main body 4, and the first locked ridge 26 is arranged. The outer lid 6 is restricted from rising with respect to the lid main body 4, and the first circumferential locking means 68 disposed on the locking wall 52 of the outer lid 6 is engaged with the lid main body 4. The rotation of the outer lid 6 with respect to the lid main body 4 is restricted by locking the first circumferentially locked means 30 provided on the stop wall 20. Therefore, when the outer lid 6 is further rotated in the above direction with respect to the lid main body 4, the first locking ridge 66, the first locked ridge 26, the first circumferential locking means 68, and Stress is transmitted to and concentrated on the breakable line 12 provided on the closing wall 8 via the first circumferentially locked means 30, and the breakable line 12 is broken by the applied force to form a discharge opening. Will be done. After the breakable line 12 is broken and a discharge opening is formed in the closed wall 8 of the lid main body 4, when the outer lid 6 is further rotated in the above direction with respect to the lid main body 4, the discharge opening forming region 14 becomes the closed wall. Separated from the other parts of 8, the discharge opening forming region 14 rises with respect to the lid body 4 together with the outer lid 6. When the discharge opening forming region 14 is removed from the other portion of the closing wall 8, the seal piece 38 elastically bends and moves above the other portion.

蓋本体４に対して外蓋６を上記方向に回転させ、蓋本体４に対して外蓋６が上昇せしめられる際には更に、外蓋６のスカート壁４８に配設されている第二の係止突条７４が蓋本体４の側壁１０に配設されている第二の被係止突条４０に係止して蓋本体４に対する外蓋６の上昇が規制されると共に、外蓋６のスカート壁４８に配設されている第二の周方向係止手段７６が蓋本体４の側壁１０に配設されている第二の周方向被係止手段４２に係止して蓋本体４に対する外蓋６の回転が規制される。従って、外蓋６を更に蓋本体４に対して上記方向に回転せしめると、第二の係止突条７４及び第二の被係止突条４０と、第二の周方向係止手段７６及び第二の周方向被係止手段４２とを介してスカート壁４８に設けられた破断可能ライン７０に応力が伝えられこれに集中し、かかる力によって破断可能ライン７０も破断される。しかる後においては、タンパーエビデント裾部４８ｂを残して主部４８ａは回転と共に上方に移動して蓋本体４から離脱され、これにより蓋本体４の閉塞壁８に生成された排出開口が露呈され、かかる排出開口を通して内容物を排出することができる。 When the outer lid 6 is rotated in the above direction with respect to the lid main body 4 and the outer lid 6 is raised with respect to the lid main body 4, a second second arranged on the skirt wall 48 of the outer lid 6 is further provided. The locking ridge 74 is locked to the second locked ridge 40 arranged on the side wall 10 of the lid main body 4, and the outer lid 6 is restricted from rising with respect to the lid main body 4, and the outer lid 6 is restricted. The second circumferential locking means 76 arranged on the skirt wall 48 of the lid main body 4 is locked to the second circumferential locking means 42 arranged on the side wall 10 of the lid main body 4. The rotation of the outer lid 6 with respect to is restricted. Therefore, when the outer lid 6 is further rotated in the above direction with respect to the lid main body 4, the second locking ridge 74, the second locked ridge 40, the second circumferential locking means 76, and the second locking ridge 76 Stress is transmitted to and concentrated on the breakable line 70 provided on the skirt wall 48 via the second circumferentially locked means 42, and the breakable line 70 is also broken by the applied force. After that, the main portion 48a moves upward with rotation, leaving the tamper-evidence hem portion 48b, and is separated from the lid main body 4, thereby exposing the discharge opening created in the closing wall 8 of the lid main body 4. , The contents can be discharged through such a discharge opening.

内容物の必要量の排出が終了した後においては、外蓋６を蓋本体４に被嵌し、次いで上方から見て時計方向に回転して外蓋６の装着壁５０の内周面に形成されている雌螺条５８を蓋本体４の被装着壁１６の外周面に形成されている雄螺条２２に螺合せしめて蓋本体４に対して外蓋６を降下させる。外蓋６を蓋本体４に対して上記方向に回転して蓋本体４に対して外蓋６を降下させると、図示は省略するが、シール片３８が閉塞壁８の上記その他の部分の上面に当接して排出開口形成領域１４の下方への移動が阻止されると共に、閉塞壁８に生成された排出開口が閉じられる。かくして、蓋本体４から離脱された外蓋６が蓋本体４に再装着される。 After the required amount of the contents has been discharged, the outer lid 6 is fitted to the lid body 4, and then rotated clockwise when viewed from above to be formed on the inner peripheral surface of the mounting wall 50 of the outer lid 6. The female screw 58 is screwed into the male screw 22 formed on the outer peripheral surface of the mounted wall 16 of the lid body 4, and the outer lid 6 is lowered with respect to the lid body 4. When the outer lid 6 is rotated in the above direction with respect to the lid main body 4 and the outer lid 6 is lowered with respect to the lid main body 4, although not shown, the seal piece 38 is the upper surface of the other portion of the closing wall 8. The discharge opening forming region 14 is prevented from moving downward, and the discharge opening formed in the closing wall 8 is closed. Thus, the outer lid 6 detached from the lid main body 4 is reattached to the lid main body 4.

２：容器蓋
４：蓋本体
６：外蓋
１６：被装着壁
２２：雄螺条
４６：天面壁
５０：装着壁
５８：雌螺条
６０：突起
６２：肩面
６４：突条 2: Container lid 4: Lid body 6: Outer lid 16: Attached wall 22: Male screw 46: Top wall 50: Mounting wall 58: Female screw 60: Protrusion 62: Shoulder surface 64: Protrusion

Claims (3)

容器の口頸部に装着される蓋本体と該蓋本体に装着される外蓋とから構成され、
該蓋本体は上端が自由端面である円筒形状の被装着壁を含み、該被装着壁の外周面には雄螺条が形成されており、
該外蓋は天面壁と該天面壁から垂下する円筒形状の装着壁とを含み、該装着壁の内周面には雌螺条が形成されており、該装着壁の内周面における該雌螺条が形成されている部位よりも上方又は該天面壁の内面には周方向に間隔をおいて配設された複数個の突起或いは周方向に連続して延在する突起が形成されていて、該突起の下面によって周方向に間隔をおいて或いは周方向に連続して延在する肩面が規定されており、
該蓋本体の該被装着壁に形成されている該雄螺条に該外蓋の該装着壁に形成されている該雌螺条を螺合し、該外蓋の該肩面を該被装着壁の該自由端面に当接することによって該蓋本体に該外蓋が装着される合成樹脂製容器蓋において、
該外蓋の該肩面及び／又は該蓋本体の該被装着壁の該自由端面は、半径方向外方に向かって上方に傾斜しており、
該蓋本体の該被装着壁の該自由端面に該外蓋の該肩面が当接して該被装着壁に押圧力が加えられると、該被装着壁には上方に向かって半径方向外側に向けて力が加えられる、
ことを特徴とする合成樹脂製容器蓋。 It is composed of a lid body attached to the mouth and neck of the container and an outer lid attached to the lid body.
The lid body includes a cylindrical mounted wall having a free end face at the upper end, and a male thread is formed on the outer peripheral surface of the mounted wall.
The outer lid includes a top wall and a cylindrical mounting wall hanging from the top wall, and a female screw is formed on the inner peripheral surface of the mounting wall, and the female on the inner peripheral surface of the mounting wall. A plurality of protrusions arranged at intervals in the circumferential direction or protrusions extending continuously in the circumferential direction are formed above the portion where the spiral is formed or on the inner surface of the top wall. , it is defined shoulder surface extending continuously protruding to the lower surface or the circumferential direction at intervals in the circumferential direction by the electromotive force,
The female screw formed on the mounting wall of the outer lid is screwed into the male screw formed on the mounted wall of the lid body, and the shoulder surface of the outer lid is mounted. In a synthetic resin container lid in which the outer lid is attached to the lid body by abutting on the free end face of the wall.
The shoulder surface of the outer lid and / or the free end surface of the mounted wall of the lid body is inclined upward in the radial direction .
When the shoulder surface of the outer lid abuts on the free end surface of the mounted wall of the lid body and a pressing force is applied to the mounted wall, the mounted wall is radially outwardly outward. Power is applied toward
A synthetic resin container lid characterized by this. 該外蓋の該肩面及び／又は該被装着壁の該自由端面は水平に対して５乃至３０度の傾斜角度で傾斜している、請求項１記載の合成樹脂製容器蓋。 The synthetic resin container lid according to claim 1, wherein the shoulder surface of the outer lid and / or the free end surface of the mounted wall is inclined at an inclination angle of 5 to 30 degrees with respect to the horizontal. 該外蓋の該装着壁の該内周面には、該雌螺条よりも上方で且つ該肩面よりも下方に位置し、周方向に間隔をおいて配設された複数個の突条或いは周方向に連続して延びる突条が形成されており、該突条の内径は該突起の内径よりも大きく、該蓋本体に該外蓋が装着されると、該突条の内面は該蓋本体の該被装着壁の外周面上端部の、該雄螺条が存在しない部位の外周面に対して間隔をおいて対向する、請求項１又は２記載の合成樹脂製容器蓋。 On the inner peripheral surface of the mounting wall of the outer lid, a plurality of ridges located above the female thread and below the shoulder surface and arranged at intervals in the circumferential direction. Alternatively, a ridge extending continuously in the circumferential direction is formed, the inner diameter of the ridge is larger than the inner diameter of the protrusion, and when the outer lid is attached to the lid body, the inner surface of the ridge becomes the same. The synthetic resin container lid according to claim 1 or 2, wherein the upper end of the outer peripheral surface of the mounted wall of the lid body faces the outer peripheral surface of the portion where the male screw does not exist at a distance .
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