JP4410498B2 - Cap hinge structure - Google Patents

Cap hinge structure Download PDF

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Publication number
JP4410498B2
JP4410498B2 JP2003173859A JP2003173859A JP4410498B2 JP 4410498 B2 JP4410498 B2 JP 4410498B2 JP 2003173859 A JP2003173859 A JP 2003173859A JP 2003173859 A JP2003173859 A JP 2003173859A JP 4410498 B2 JP4410498 B2 JP 4410498B2
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Prior art keywords
cap
hinge
lid
cap body
side edges
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JP2005008209A (en
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昌幸 染谷
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Tokan Kogyo Co Ltd
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Tokan Kogyo Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、容器等の口部に嵌合されるキャップに関し、特に、キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品から構成されるキャップのヒンジ構造に関する。
【０００２】
【従来の技術】
従来、キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品からキャップが構成され、蓋部がキャップ本体部の上面を覆う閉状態と、蓋部がキャップ本体部の上面を露出させる開状態との間で前記ヒンジ部により蓋部がキャップ本体部に対して回動可能となったキャップのヒンジ構造が知られている。このようなキャップは、容器等の口部等に装着されて、容器等の口部を保護する際には閉状態となり、容器等の内容物を取出すときには、蓋部をキャップ本体部から反転させて開状態としてキャップ本体部の上面を露出し、キャップ本体部を通して内容物を取出すことができるようになっている。
【０００３】
従来のキャップのヒンジ構造においては、ヒンジ部が、弾性中間素子から構成され、弾性中間素子が薄肉の膜状ヒンジによってキャップ本体部と蓋部とにそれぞれつながっているものが知られている（例えば、特許文献１、特許文献２参照。）。また、図８及び図９は、現在市販されているキャップのヒンジ構造のヒンジ部の構成を表す要部平面図及び要部断面図であり、キャップ本体部２と蓋部４との間を連結するヒンジ部６は、その両端縁部においてステップ状の弾性肉厚部６ａ、６ａを備えており、該弾性肉厚部６ａ、６ａとキャップ本体部２及び蓋部４とをそれぞれ連結する膜状ヒンジ６ｂ、６ｂとを備えている。
【０００４】
【特許文献１】
特公昭６３−１７７０７号公報
【特許文献２】
実用新案登録第２５２４６３６号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、従来のキャップのヒンジ構造においては、蓋部の開閉動作を繰り返したり、または冷蔵庫のような低温で長時間保管したキャップに衝撃力を与えたりすると、弾性肉厚部６ａとキャップ本体部２及び蓋部４とを連結する薄肉の膜状ヒンジ６ｂ、６ｂの部分に亀裂が入り、最終的には膜状ヒンジ６ｂ、６ｂが切断して、キャップが破損するという問題がある。
【０００６】
本発明はかかる課題に鑑みなされたもので、その目的は、ヒンジ部の強度を向上させることができ、繰り返しの開閉や低温保管に対して耐久性を向上させることができるキャップのヒンジ構造を提供することである。
【０００７】
【課題を解決するための手段】
上記目的を達成するために、本発明のうち請求項１記載の発明は、キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品からキャップが構成され、蓋部がキャップ本体部の上面を覆う閉状態と、蓋部がキャップ本体部の上面を露出させる開状態との間で前記ヒンジ部により蓋部がキャップ本体部に対して回動可能となったキャップのヒンジ構造において、
前記ヒンジ部は少なくともその両側縁部が全体的に薄肉膜の面で構成され、該ヒンジ部の両側縁部がキャップ成形時における形状から延伸された形状に塑性変形された結果、開状態で平面から見て薄肉膜の該両側縁部が扇状となっていることを特徴とする。
【０００８】
請求項２記載の発明は、キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品からキャップが構成され、蓋部がキャップ本体部の上面を覆う閉状態と、蓋部がキャップ本体部の上面を露出させる開状態との間で前記ヒンジ部により蓋部がキャップ本体部に対して回動可能となったキャップのヒンジ構造において、
前記ヒンジ部は少なくともその両側縁部が全体的に薄肉膜の面で構成され、該ヒンジ部の両側縁部は、その端縁に沿った長さがキャップ成形時における長さよりも長くなるように塑性変形された結果、開状態で平面から見て薄肉膜の該両側縁部が扇状となっていることを特徴とする。
【０００９】
請求項３記載の発明は、キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品からキャップが構成され、蓋部がキャップ本体部の上面を覆う閉状態と、蓋部がキャップ本体部の上面を露出させる開状態との間で前記ヒンジ部により蓋部がキャップ本体部に対して回動可能となったキャップのヒンジ構造において、
前記ヒンジ部は少なくともその両側縁部が全体的に薄肉膜の面で構成され、該ヒンジ部の両側縁部は、その肉厚が、キャップ成形時における肉厚よりも薄くなるように塑性変形された結果、開状態で平面から見て薄肉膜の該両側縁部が扇状となっていることを特徴とする。
【００１０】
本発明では、ヒンジの両側縁部が薄肉膜で構成されて、延伸による変形が発生している。この延伸による変形は、ヒンジ部の両側縁部の端縁に沿った長さがキャップ成形時における長さよりも長くなる変形か、または、ヒンジ部の両側縁部の肉厚が、キャップ成形時における肉厚よりも薄くなる変形を伴うことが考えられる。いずれにおいても延伸による変形によって、ヒンジ部の両側縁部の強度が向上し、ヒンジ部に亀裂が入ることを抑制することができる。
【００１１】
上記延伸による変形は、任意の方法で発生させることができるが、請求項４記載の発明は、塑性変形が、前記蓋部がキャップ本体部に対して１８０度開いた開状態で行われる成形後に、閉状態へと蓋部を回動させることによって発生されたものであることを特徴とする。
【００１２】
成形後、初めて蓋部を閉動作させると、ヒンジ部に作用する引張り力によって、ヒンジ部の前記両側縁部に延伸を発生させることができる。一度の閉動作によって延伸により分子構造を配向させて塑性変形させることができる。こうして、蓋部の閉動作で簡単にヒンジ部の両側縁部に変形をさせることができる。
【００１３】
また、請求項５記載の発明は、ヒンジ部の前記両側縁部のキャップ本体部との境界部及び蓋部との境界部において、ヒンジ部の前記両側縁部の肉厚は、キャップ本体部または蓋部からヒンジ部に向かって漸次薄くなるように変化していることを特徴とする。
【００１４】
境界部の肉厚を漸次変化させることで、延伸変形させる際に、境界部に応力が集中することを防ぎ、両側縁部全体に亘り延伸変形を発生させて、ヒンジ部全体の強度を向上させることができる。
【００１５】
【発明の実施の形態】
図１〜図４は本発明のキャップのヒンジ構造の実施形態を表す図である。図において、キャップ１０は一体の合成樹脂成形品からなっており、好ましくは、延伸性に優れたポリプロピレン樹脂が用いられるとよいが、これに限るものではなく、ポリエチレン樹脂等の任意の延伸性を有する樹脂を使用することができる。
【００１６】
キャップ１０は、大まかに、キャップ本体部１２と、蓋部１４と、該キャップ本体部１２及び蓋部１４のそれぞれの外周面を連結するヒンジ部１６とを備えている。キャップ本体部１２と蓋部１４とは、筒状（円筒、またはそれ以外の四角筒、多角形筒等でも良い）形状をなしている。キャップ本体部１２の上部には、鍔部１２ｂが形成されており、一方の蓋部１４の内周面には係止リブ１４ａが形成されており、蓋部１４の係止リブ１４ａがキャップ本体部１２の鍔部１２ｂに着脱可能に係止することにより、蓋部１４はキャップ本体部１２の上部に嵌合して、キャップ本体部１２の上面を覆うことができるようになっている。キャップ本体部１２の上面には、適宜ノズル１２ａを突設することができ、ノズル１２ａの中心孔は、キャップ本体部１２が装着される容器内部に連通される。
【００１７】
蓋部１４は、キャップ本体部１２の上面を覆う閉状態と、キャップ本体部１２の上面を露出させる開状態との間で反転回動して開閉動作可能となっており、閉状態にある０度から１８０度以上開くことができ、その角度の中で少なくとも一部の角度範囲において、ヒンジ部１６がその弾発力によって弾性開閉するようになっている。
【００１８】
ヒンジ部１６の拡大図を図５に示す。ヒンジ部１６は、中央の部分が中央ヒンジ部１６ａとなっている。中央ヒンジ部１６ａに対してその両側に伸びる両側縁部１６ｂは、全体的に連続の薄肉膜で構成される。キャップ１０開状態において、各側縁部１６ｂの平面形状は略三角形状、両側縁部１６ｂあわせて略蝶形状となっており、各側縁部１６ｂは、中央ヒンジ部１６ａからその端縁１６ｄに向かって漸次下方へと下がっている。両側縁部１６ｂの少なくとも端縁１６ｄ部分、好ましくは両側縁部１６ｂ全体には、延伸変形の妨げとなるようなステップ状の肉厚部または凹凸は一切存在していない。また、両側縁部１６ｂの薄肉膜の肉厚は、０．１ｍｍ〜０．５ｍｍ程度、好ましくは、０．２ｍｍ〜０．４ｍｍ程度とするとよい。
【００１９】
このヒンジ部１６の両側縁部１６ｂのキャップ本体部１２と蓋部１４とのそれぞれの境界部１６ｃ、１６ｃにおいては、図６に示すように、ヒンジ部１６の前記両側縁部１６ｂの肉厚が、キャップ本体部１２または蓋部１４からヒンジ部１６に向かって漸次薄くなるように変化している。例えば、キャップ本体部１２または蓋部１４側肉厚０．６ｍｍ以上から、ヒンジ部１６側肉厚０．１ｍｍ〜０．５ｍｍへと漸次変化する。
【００２０】
以上のキャップ１０は、成形する際には、図３に示したように蓋部１４がキャップ本体部１２に対して１８０度回動した開状態を成形品として金型を用いて射出成型される。この金型で設定されるヒンジ部１６の両側縁部１６ｂに対応する部分は、例えば、境界部１６ｃを除き、薄肉膜状になる肉厚に設定され、特に、少なくとも両側縁部１６ｂの端縁１６ｄはその端縁１６ｄの長さに亘り所定の均一な肉厚（例えば０．１ｍｍ〜０．５ｍｍ）に設定され、且つ、両側縁部１６ｂの端縁１６ｄは、ヒンジ軸１８に対して直交する方向に直線状に伸びるように設定されている（図５）。
【００２１】
以上のように設定された金型で図３に示す開状態で成形された成形品に対して、蓋部１４を回動して蓋部１４を閉じると、ヒンジ部１６の両側縁部１６ｂは、薄肉膜状となっているために、延伸が発生し変形する。換言すると、両側縁部１６ｂの肉厚は、この蓋部１４の閉動作により延伸が発生する程度の肉厚に設定されている必要がある。この延伸に伴い、両側縁部１６ｂの少なくとも端縁１６ｄは、その肉厚が金型で設定された肉厚、言い換えると成形された直後の肉厚よりも薄くなるか、または、その端縁１６ｄに沿って３次元的に測った長さが、金型で設定された長さ、言い換えると成形された直後の長さよりも長くなるか、の少なくともいずれかの現象が生ずる。この例の場合、図７に示すように、端縁１６ｄの形状は、ヒンジ軸１８に直交する直線から扇状へと変化する。
【００２２】
両側縁部１６ｂの境界部１６ｃにおいては、漸次肉厚が変化しており、且つ、境界部１６ｃを除く端縁１６ｄにおいては肉厚は均一であるために、延伸の際に境界部１６ｃに応力が集中することはなく、延伸による分子構造の配向は、端縁１６ｄの全体に亘り発生することになる。
【００２３】
以上の延伸による塑性変形により、端縁１６ｄの強度は向上する。そのために、繰り返しの開閉動作による耐久性や低温における耐衝撃性が格段に向上する。従来の図８及び図９に示す構成であると、仮に延伸が起こるとしても、それは膜状ヒンジ６ｂ、６ｂの部分だけとなり、膜状ヒンジ６ｂ、６ｂに応力集中が発生する結果となり、却って膜状ヒンジ６ｂ、６ｂの強度が低下し、亀裂が入りやすくなる。これに対して本発明では、かかる亀裂の発生を抑制することができる。
【００２４】
【発明の効果】
以上のように本発明によれば、ヒンジ部の両側縁部が薄肉膜で構成されているために延伸による変形を発生させることができ、この延伸による変形によって、ヒンジ部の両側縁部の強度が向上し、ヒンジ部に亀裂が入ることを抑制することができ、耐久性、低温時の耐衝撃性を格段に向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るキャップの斜視図である。
【図２】本発明の実施形態に係るキャップの開状態を表す平面図である。
【図３】図２の３−３線に沿って見た断面図である。
【図４】キャップの閉状態を表す図３相当図である。
【図５】本発明の実施形態に係るキャップのヒンジ部を含む要部拡大平面図であり、成形直後の状態を表す。
【図６】図５の６−６線に沿って見た断面図である。
【図７】本発明の実施形態に係るキャップのヒンジ部を含む要部拡大平面図であり、成形後にヒンジ部の両側縁部を延伸した状態を表す。
【図８】従来のキャップのヒンジ部を含む要部拡大平面図である。
【図９】図８の９−９線に沿って見た断面図である。
【符号の説明】
１０ キャップ
１２ キャップ本体部
１４ 蓋部
１６ ヒンジ部
１６ｂ 側縁部
１６ｄ 端縁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap fitted to a mouth portion of a container or the like, and in particular, an integrated body including a cap main body portion, a lid portion, and a hinge portion that connects the outer peripheral surfaces of the cap main body portion and the lid portion. The present invention relates to a hinge structure of a cap composed of a synthetic resin molded product.
[0002]
[Prior art]
Conventionally, a cap is composed of an integral synthetic resin molded product including a cap main body portion, a lid portion, and a hinge portion connecting the cap main body portion and each outer peripheral surface of the lid portion. A hinge structure of a cap is known in which the lid portion is rotatable with respect to the cap body portion by the hinge portion between a closed state that covers the upper surface and an open state in which the lid portion exposes the upper surface of the cap body portion. ing. Such a cap is attached to the mouth of a container or the like, and is closed when protecting the mouth of the container or the like. When removing the contents of the container or the like, the lid is inverted from the cap body. Then, the upper surface of the cap main body is exposed in the open state, and the contents can be taken out through the cap main body.
[0003]
In a conventional cap hinge structure, there is known a structure in which a hinge portion is composed of an elastic intermediate element, and the elastic intermediate element is connected to a cap body portion and a lid portion by a thin film hinge (for example, , Patent Document 1 and Patent Document 2). 8 and 9 are a main part plan view and a main part sectional view showing the structure of the hinge part of the hinge structure of the cap currently on the market, and the cap body part 2 and the lid part 4 are connected to each other. The hinge portion 6 is provided with step-like elastic thick portions 6a and 6a at both edge portions thereof, and the elastic thick portions 6a and 6a are connected to the cap body portion 2 and the lid portion 4 respectively. Hinges 6b and 6b are provided.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 63-17707 [Patent Document 2]
Utility Model Registration No. 2524636 Gazette
[Problems to be solved by the invention]
However, in the conventional hinge structure of the cap, when the opening / closing operation of the lid is repeated or when an impact force is applied to the cap stored at a low temperature such as a refrigerator for a long time, the elastic thick portion 6a and the cap main body 2 In addition, there is a problem that the thin film hinges 6b and 6b connecting the cover 4 are cracked and eventually the film hinges 6b and 6b are cut to break the cap.
[0006]
The present invention has been made in view of such a problem, and an object of the present invention is to provide a hinge structure of a cap that can improve the strength of the hinge part and can improve durability against repeated opening and closing and low-temperature storage. It is to be.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention is an integrated body comprising a cap body part, a lid part, and a hinge part for connecting the cap body part and the outer peripheral surface of the lid part. A cap is formed of the synthetic resin molded product, and the lid portion is capped by the hinge portion between a closed state where the lid portion covers the upper surface of the cap body portion and an open state where the lid portion exposes the upper surface of the cap body portion. In the hinge structure of the cap that can rotate with respect to the main body,
The hinge portion is constituted by a surface of at least both side edges generally thin film, results both side edge portions of the hinge portion is plastically deformed into a shape that is drawn from the shape during the cap molding plane in the open state When viewed from the side, the both side edges of the thin film are fan-shaped .
[0008]
According to a second aspect of the present invention, a cap is formed of an integral synthetic resin molded article including a cap body portion, a lid portion, and a hinge portion that couples the outer peripheral surfaces of the cap body portion and the lid portion. The lid portion can be rotated with respect to the cap body portion by the hinge portion between a closed state where the portion covers the upper surface of the cap body portion and an open state where the lid portion exposes the upper surface of the cap body portion In the hinge structure of
The hinge part is formed of a thin film surface at least at both side edges, and the length of the both side edges of the hinge part is longer than the length at the time of molding the cap. As a result of plastic deformation, both side edges of the thin film are fan-shaped when viewed from the plane in the open state .
[0009]
According to a third aspect of the present invention, a cap is formed of an integral synthetic resin molded article including a cap main body portion, a lid portion, and a hinge portion connecting the outer peripheral surfaces of the cap main body portion and the lid portion. The lid portion can be rotated with respect to the cap body portion by the hinge portion between a closed state where the portion covers the upper surface of the cap body portion and an open state where the lid portion exposes the upper surface of the cap body portion In the hinge structure of
The hinge part is formed of a thin film surface at least on both sides of the hinge part, and the both side edges of the hinge part are plastically deformed so that the thickness thereof is thinner than the thickness at the time of cap molding. As a result, the both side edges of the thin film are fan-shaped when viewed from above in the open state .
[0010]
In the present invention, both side edges of the hinge are formed of a thin film, and deformation due to stretching occurs. This deformation due to stretching is a deformation in which the length along the edge of both side edges of the hinge part is longer than the length at the time of cap molding, or the thickness of both side edges of the hinge part is at the time of cap molding. It may be accompanied by deformation that becomes thinner than the wall thickness. In any case, the strength of both side edges of the hinge portion is improved by deformation due to stretching, and cracks can be prevented from entering the hinge portion.
[0011]
The deformation due to the stretching can be generated by an arbitrary method, but the invention according to claim 4 is characterized in that the plastic deformation is performed after the molding in which the lid portion is opened 180 degrees with respect to the cap body portion. It is generated by rotating the lid portion to the closed state.
[0012]
When the lid portion is closed for the first time after molding, stretching can be generated at both side edges of the hinge portion by a tensile force acting on the hinge portion. The molecular structure can be oriented and plastically deformed by stretching by a single closing operation. In this way, the side edges of the hinge can be easily deformed by the closing operation of the lid.
[0013]
In the invention according to claim 5, the thickness of the both side edges of the hinge part in the boundary part between the both side edges of the hinge part and the cap body part and the lid part is determined as follows: It changes so that it may become thin gradually from a cover part toward a hinge part.
[0014]
By gradually changing the thickness of the boundary portion, when stretching and deforming, the stress is prevented from concentrating on the boundary portion, and stretching deformation is generated over the entire side edges, thereby improving the strength of the entire hinge portion. be able to.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1-4 is a figure showing embodiment of the hinge structure of the cap of this invention. In the figure, the cap 10 is made of an integral synthetic resin molded product, and preferably, a polypropylene resin excellent in stretchability is used. However, the present invention is not limited to this, and any stretchability such as polyethylene resin can be used. Can be used.
[0016]
The cap 10 roughly includes a cap main body portion 12, a lid portion 14, and a hinge portion 16 that couples the outer peripheral surfaces of the cap main body portion 12 and the lid portion 14. The cap main body portion 12 and the lid portion 14 have a cylindrical shape (may be a cylinder, or other rectangular tube, polygonal tube, or the like). A collar portion 12b is formed on the upper portion of the cap body portion 12, a locking rib 14a is formed on the inner peripheral surface of one lid portion 14, and the locking rib 14a of the lid portion 14 is the cap body. By detachably engaging the collar portion 12b of the portion 12, the lid portion 14 can be fitted to the upper portion of the cap main body portion 12 so as to cover the upper surface of the cap main body portion 12. A nozzle 12 a can be appropriately provided on the upper surface of the cap body 12, and the central hole of the nozzle 12 a communicates with the inside of the container in which the cap body 12 is mounted.
[0017]
The lid portion 14 is capable of opening and closing by rotating reversely between a closed state that covers the upper surface of the cap body portion 12 and an open state that exposes the upper surface of the cap body portion 12. The hinge portion 16 can be elastically opened and closed by its elastic force in at least a part of the angle range.
[0018]
An enlarged view of the hinge portion 16 is shown in FIG. As for the hinge part 16, the center part is the center hinge part 16a. Both side edge portions 16b extending on both sides of the central hinge portion 16a are formed of a continuous thin film as a whole. In the cap 10 open state, the planar shape of each side edge portion 16b is substantially triangular, and the both side edge portions 16b are substantially butterfly shaped. Each side edge portion 16b extends from the central hinge portion 16a to its end edge 16d. It gradually goes down. There are no stepped thick portions or irregularities that obstruct the stretching deformation at least at the end edge 16d portion of the side edge portions 16b, preferably the entire side edge portions 16b. Further, the thickness of the thin film on both side edges 16b is about 0.1 mm to 0.5 mm, preferably about 0.2 mm to 0.4 mm.
[0019]
In the boundary portions 16c and 16c between the cap main body portion 12 and the lid portion 14 of the side edge portions 16b of the hinge portion 16, as shown in FIG. The cap body portion 12 or the lid portion 14 is gradually thinned toward the hinge portion 16. For example, the thickness gradually changes from the cap body portion 12 or the lid portion 14 side thickness of 0.6 mm or more to the hinge portion 16 side thickness of 0.1 mm to 0.5 mm.
[0020]
When the above cap 10 is molded, it is injection-molded using a mold with the open state where the lid portion 14 is rotated 180 degrees with respect to the cap body portion 12 as shown in FIG. . The portions corresponding to both side edge portions 16b of the hinge portion 16 set by this mold are set to have a thin film shape, for example, except for the boundary portion 16c. In particular, at least the edges of both side edge portions 16b 16d is set to a predetermined uniform thickness (for example, 0.1 mm to 0.5 mm) over the length of the end edge 16d, and the end edges 16d of both side edges 16b are orthogonal to the hinge shaft 18. It is set so as to extend in a straight line in the direction of movement (FIG. 5).
[0021]
When the lid portion 14 is rotated and the lid portion 14 is closed with respect to a molded product molded in the open state shown in FIG. 3 with the mold set as described above, both side edges 16b of the hinge portion 16 are Since it is in the form of a thin film, stretching occurs and deforms. In other words, the thickness of the side edge portions 16b needs to be set to such a thickness that stretching occurs due to the closing operation of the lid portion 14. With this stretching, at least the edge 16d of the side edges 16b becomes thinner than the wall thickness set by the mold, in other words, the wall thickness immediately after molding, or the edge 16d. The length measured in a three-dimensional manner along the length of at least one of the length set by the mold, in other words, longer than the length immediately after molding occurs. In the case of this example, as shown in FIG. 7, the shape of the end edge 16 d changes from a straight line orthogonal to the hinge shaft 18 to a fan shape.
[0022]
At the boundary portion 16c of the side edge portions 16b, the wall thickness gradually changes, and at the edge 16d excluding the boundary portion 16c, the wall thickness is uniform, so that stress is applied to the boundary portion 16c during stretching. However, the molecular structure is oriented by stretching over the entire edge 16d.
[0023]
Due to the plastic deformation caused by the above stretching, the strength of the edge 16d is improved. Therefore, durability by repeated opening and closing operations and impact resistance at low temperatures are significantly improved. 8 and 9, even if stretching occurs, only the film hinges 6 b and 6 b become part of the film hinges 6 b and 6 b, resulting in stress concentration on the film hinges 6 b and 6 b. The strength of the hinges 6b and 6b is reduced, and cracks are easily formed. On the other hand, in this invention, generation | occurrence | production of this crack can be suppressed.
[0024]
【The invention's effect】
As described above, according to the present invention, since both side edges of the hinge portion are formed of a thin film, deformation due to stretching can be generated. Can be improved and cracks can be suppressed in the hinge portion, and the durability and impact resistance at low temperatures can be significantly improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cap according to an embodiment of the present invention.
FIG. 2 is a plan view showing an open state of a cap according to the embodiment of the present invention.
3 is a cross-sectional view taken along line 3-3 in FIG.
FIG. 4 is a view corresponding to FIG. 3 showing a closed state of the cap.
FIG. 5 is an enlarged plan view of a main part including a hinge part of a cap according to an embodiment of the present invention, showing a state immediately after molding.
6 is a cross-sectional view taken along line 6-6 in FIG.
FIG. 7 is an enlarged plan view of a main part including a hinge part of a cap according to an embodiment of the present invention, and shows a state where both side edges of the hinge part are extended after molding.
FIG. 8 is an enlarged plan view of a main part including a hinge part of a conventional cap.
9 is a cross-sectional view taken along line 9-9 of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Cap 12 Cap main-body part 14 Cover part 16 Hinge part 16b Side edge part 16d End edge

Claims (5)

キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品からキャップが構成され、蓋部がキャップ本体部の上面を覆う閉状態と、蓋部がキャップ本体部の上面を露出させる開状態との間で前記ヒンジ部により蓋部がキャップ本体部に対して回動可能となったキャップのヒンジ構造において、
前記ヒンジ部は少なくともその両側縁部が全体的に薄肉膜の面で構成され、該ヒンジ部の両側縁部がキャップ成形時における形状から延伸された形状に塑性変形された結果、開状態で平面から見て薄肉膜の該両側縁部が扇状となっていることを特徴とするキャップのヒンジ構造。The cap is composed of an integral synthetic resin molded product comprising a cap body part, a lid part, and a hinge part that connects the outer peripheral surfaces of the cap body part and the lid part, and the lid part covers the upper surface of the cap body part. In the hinge structure of the cap in which the lid portion can be rotated with respect to the cap body portion by the hinge portion between the closed state to cover and the open state in which the lid portion exposes the upper surface of the cap body portion,
The hinge portion is constituted by a surface of at least both side edges generally thin film, results both side edge portions of the hinge portion is plastically deformed into a shape that is drawn from the shape during the cap molding plane in the open state A hinge structure of a cap, wherein both side edges of the thin film are fan-shaped when viewed from the top . キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品からキャップが構成され、蓋部がキャップ本体部の上面を覆う閉状態と、蓋部がキャップ本体部の上面を露出させる開状態との間で前記ヒンジ部により蓋部がキャップ本体部に対して回動可能となったキャップのヒンジ構造において、
前記ヒンジ部は少なくともその両側縁部が全体的に薄肉膜の面で構成され、該ヒンジ部の両側縁部は、その端縁に沿った長さがキャップ成形時における長さよりも長くなるように塑性変形された結果、開状態で平面から見て薄肉膜の該両側縁部が扇状となっていることを特徴とするキャップのヒンジ構造。The cap is composed of an integral synthetic resin molded product comprising a cap body part, a lid part, and a hinge part that connects the outer peripheral surfaces of the cap body part and the lid part, and the lid part covers the upper surface of the cap body part. In the hinge structure of the cap in which the lid portion can be rotated with respect to the cap body portion by the hinge portion between the closed state to cover and the open state in which the lid portion exposes the upper surface of the cap body portion,
The hinge part is formed of a thin film surface at least at both side edges, and the length of the both side edges of the hinge part is longer than the length at the time of molding the cap. A hinge structure of a cap, characterized in that, as a result of plastic deformation, the both side edges of the thin film are fan-shaped when viewed from the plane in the open state . キャップ本体部と、蓋部と、キャップ本体部と蓋部のそれぞれの外周面とを連結するヒンジ部とからなる一体の合成樹脂成形品からキャップが構成され、蓋部がキャップ本体部の上面を覆う閉状態と、蓋部がキャップ本体部の上面を露出させる開状態との間で前記ヒンジ部により蓋部がキャップ本体部に対して回動可能となったキャップのヒンジ構造において、
前記ヒンジ部は少なくともその両側縁部が全体的に薄肉膜の面で構成され、該ヒンジ部の両側縁部は、その肉厚が、キャップ成形時における肉厚よりも薄くなるように塑性変形された結果、開状態で平面から見て薄肉膜の該両側縁部が扇状となっていることを特徴とするキャップのヒンジ構造。The cap is composed of an integral synthetic resin molded product comprising a cap body part, a lid part, and a hinge part that connects the outer peripheral surfaces of the cap body part and the lid part, and the lid part covers the upper surface of the cap body part. In the hinge structure of the cap in which the lid portion can be rotated with respect to the cap body portion by the hinge portion between the closed state to cover and the open state in which the lid portion exposes the upper surface of the cap body portion,
The hinge part is formed of a thin film surface at least on both sides of the hinge part, and the both side edges of the hinge part are plastically deformed so that the thickness thereof is thinner than the thickness at the time of cap molding. As a result, the hinge structure of the cap, wherein both side edges of the thin film are fan-shaped when viewed from the plane in the open state . 前記塑性変形は、前記蓋部がキャップ本体部に対して１８０度開いた開状態で行われる成形後に、閉状態へと蓋部を回動させることによって発生されたものであることを特徴とする請求項１ないし３のいずれか１項に記載のキャップのヒンジ構造。  The plastic deformation is generated by rotating the lid portion to a closed state after molding performed in an open state in which the lid portion is opened 180 degrees with respect to the cap main body portion. The hinge structure of the cap according to any one of claims 1 to 3. ヒンジ部の前記両側縁部のキャップ本体部との境界部及び蓋部との境界部において、ヒンジ部の前記両側縁部の肉厚は、キャップ本体部または蓋部からヒンジ部に向かって漸次薄くなるように変化していることを特徴とする請求項１ないし４のいずれか１項に記載のキャップのヒンジ構造。  The thickness of the both side edges of the hinge part gradually decreases from the cap body part or the cover part toward the hinge part at the boundary part between the both side edges of the hinge part and the cap body part. The hinge structure of the cap according to any one of claims 1 to 4, wherein the hinge structure is changed to become.
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