JP3795623B2

JP3795623B2 - Synthetic plastic female part for snap fastener

Info

Publication number: JP3795623B2
Application number: JP09824297A
Authority: JP
Inventors: 精武田
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-31
Filing date: 1997-03-31
Publication date: 2006-07-12
Anticipated expiration: 2017-03-31
Also published as: JPH10272005A

Description

【０００１】
【発明の属する技術分野】
本発明は、スナップファスナーの雌スナップを構成するための合成樹脂製雌型部材に関し、詳しくは、外側ほど低くなるように傾斜した後、下方へ垂下した環状基板の中央に、裏面側へ凹入し且つ上端側内周面には雄型部材の突起部を係止する隆起部が周方向に小間隙を隔てて形成された雌型嵌合部を連設すると共に、この雌型嵌合部の底壁の中央には、可撓性膜体の片側から打ち込まれるリベット部材の突起を挿入してカシメ止めするための貫通孔を形成し、環状基板裏面と雌型嵌合部との間に形成された溝には前記隆起部間の小間隙に対応する位置において雌型嵌合部と環状基板とを連結する複数のリブを形成してあるスナップファスナー用の合成樹脂製雌型部材の改良技術に関するものである。
【０００２】
【従来の技術】
一般に、この種の合成樹脂製雌型部材においては、雌型嵌合部の開口端側の内径が、内周面から隆起部を突出させることよって、雄型部材の突起部の先端側外径よりも小さくなっている。そして、雄型部材の突起部を嵌合ならびに嵌合離脱する際、隆起部が突起部で半径方向外方へ押圧されることにより、雌型嵌合部が弾性復元力に抗して半径方向へ拡径変形するように構成されている。
【０００３】
しかしながら、従来の合成樹脂製雌型部材では、隆起部の下方に円筒状の周壁部分が位置し、この周壁部分が雌型嵌合部の弾性変形に対する抵抗となるため、雄型部材の突起部との嵌合（スナップ作用）がきつくなりがちである。そのため、雌型嵌合部の開口端側の内径や雄型部材の突起部の先端側の外径に、僅かでも製作誤差があると、嵌合が不能になったり、あるいは無理に嵌合して、嵌合離脱が困難になることがあった。
【０００４】
【発明が解決しようとする課題】
上記の従来欠点の解消策として、本発明者は、次のようなスナップファスナー用の合成樹脂製雌型部材を既に開発している。この合成樹脂製雌型部材は、図１１に示すように、外側ほど低くなるように傾斜した後、下方へ垂下した環状基板６の中央に、裏面側へ凹入し且つ上端側内周面には雄型部材の突起部を係止する隆起部７が周方向に小間隙８を隔てて形成された雌型嵌合部９を連設すると共に、この雌型嵌合部９の底壁１０の中央には、可撓性膜体の片側から打ち込まれるリベット部材の突起を挿入してカシメ止めするための貫通孔１２を形成し、環状基板裏面と雌型嵌合部との間に形成された溝１３には前記隆起部間の小間隙８に対応する位置において雌型嵌合部９と環状基板６とを連結する複数の放射状のリブ１４を形成してあるスナップファスナー用の合成樹脂製雌型部材２Ａであって、前記隆起部７と環状基板６との接続部位Ｐを環状基板６よりも薄肉に形成する一方、前記隆起部７の下方で且つリブ１４，１４同士の間に、半径方向へ開口した開口部１５を形成した点に特徴がある。
【０００５】
上記の構成によれば、雄型部材の突起部とのスナップ作用時、雌型嵌合部の弾性変形に対する抵抗となる部位、つまり、従来の合成樹脂製雌型部材において隆起部の下方に位置していた円筒状の周壁部分に相当する部位に、半径方向へ開口した開口部１５が形成されているので、隆起部７の半径方向への弾性変形が容易に行われることになる。
【０００６】
しかも、隆起部７と環状基板６との接続部位Ｐが薄肉に形成されていることと、隆起部７の下方に開口部１５が形成されていることとによって、雄型部材１Ａの突起部３とのスナップ作用時、図１２に実線と仮想線で示すように、隆起部７は薄肉の接続部位Ｐを中心にして揺動するように弾性変形するので、半径方向だけでなく、上下方向（軸芯方向）へも弾性変形することが可能となる。
【０００７】
従って、雌型嵌合部の開口端側の内径や雄型部材の突起部の先端側の外径に多少の製作誤差があっても、嵌合が不能になったり、嵌合離脱が困難になったりすることを防止できるのである。
【０００８】
以上のとおり、隆起部７と環状基板６との接続部位Ｐを薄肉に形成することと、隆起部７の下方に開口部１５を形成することは、雄型部材の突起部との嵌合ならびに嵌合離脱の作用を確実化する上で、非常に好ましいのであるが、多くの試作実験の結果、隆起部７の下方に開口部１５を形成すると、製造上、次のような問題が生じることが判明した。
【０００９】
即ち、スナップファスナー用の合成樹脂製雌型部材は、一般に、雌型部材の裏面側を成形する固定側の金型と、雌型部材の表面側を成形する可動側の金型との間に形成される成形用空間に溶融樹脂を注入する射出成形法によって製造されるものであり、従来の合成樹脂製雌型部材において隆起部の下方に位置していた円筒状の周壁部分に相当する部位に、半径方向へ開口した開口部１５を形成するにあたっては、図１３に示すように、前記固定側の金型１７Ａのうち、雌型嵌合部の外周面を成形する金型部分と、前記可動側の金型１７Ｂのうち、雌型嵌合部の内周面を成形する金型部分とを、開口部成形位置において、局部的に密着させ、この密着部位Ｘに溶融樹脂が注入されないようにする必要がある。
【００１０】
従って、射出成形の都度、固定側金型１７Ａと可動側金型１７Ｂとが、上記の密着部位Ｘで互いに摺動することになり、金型１７Ａ，１７Ｂの摺動面が早期に磨耗するので、同一金型１７Ａ，１７Ｂによる大量生産が困難であり、製造コスト上、不利である。
【００１１】
本発明は、この点を改良し、雄型部材の突起部とのスナップ作用時、雌型嵌合部の弾性変形に対する抵抗となる部位、つまり、従来の合成樹脂製雌型部材において隆起部の下方に位置していた円筒状の周壁部分に相当する部位に、半径方向へ開口した開口部を形成した場合に比しても遜色ない程、確実に嵌合ならびに嵌合離脱の作用を行え、それでいて、射出成形用金型の磨耗を抑制して、同一金型による大量生産が可能となる製造コスト上、有利なスナップファスナー用の合成樹脂製雌型部材を提供せんとするものである。
【００１２】
【課題を解決するための手段】
上記の目的を達成するために、本発明が講じた技術的手段は次の通りである。即ち、本発明によるスナップファスナー用の合成樹脂製雌型部材は、外側ほど低くなるように傾斜した後、下方へ垂下した環状基板の中央に、裏面側へ凹入し且つ上端側内周面には雄型部材の突起部を係止する隆起部が周方向に小間隙を隔てて形成された雌型嵌合部を連設すると共に、この雌型嵌合部の底壁の中央には、可撓性膜体の片側から打ち込まれるリベット部材の突起を挿入してカシメ止めするための貫通孔を形成し、環状基板裏面と雌型嵌合部との間に形成された溝には前記隆起部間の小間隙に対応する位置において雌型嵌合部と環状基板とを連結する複数のリブを形成してあるスナップファスナー用の合成樹脂製雌型部材であって、前記隆起部と環状基板との接続部位を環状基板よりも薄肉に形成する一方、前記隆起部の下方で且つリブ同士の間に位置する周壁部分を薄膜状に形成したことを特徴としている。
【００１３】
上記の構成によれば、雄型部材の突起部とのスナップ作用時、雌型嵌合部の弾性変形に対する抵抗となる部位、つまり、従来の合成樹脂製雌型部材において隆起部の下方に位置していた円筒状の周壁部分が薄膜状に形成されているので、隆起部の半径方向への弾性変形に対する抵抗は、極端に小さくなる。
【００１４】
しかも、隆起部と環状基板との接続部位が薄肉に形成されていることと、隆起部の下方の周壁部分が薄膜状に形成されていることとによって、隆起部は半径方向だけでなく、上下方向（軸芯方向）へも弾性変形することが可能となる。
【００１５】
従って、隆起部の下方に開口部を形成した場合に比しても遜色ない程、確実な嵌合ならびに嵌合離脱の作用が得られ、雌型嵌合部の開口端側の内径や雄型部材の突起部の先端側の外径に多少の製作誤差があっても、嵌合が不能になったり、嵌合離脱が困難になったりすることを防止できるのである。
【００１６】
それでいて、隆起部の下方に開口部を形成する場合のように、射出成形用の固定側金型と可動側金型の一部を密着させて摺動面とする必要がなく、当該摺動面に相当する部位に、薄膜の厚みに相当する薄膜部成形用の隙間が形成されることになるから、射出成形用金型の磨耗を抑制して、同一金型による大量生産が可能となり、製造コスト上、有利である。
【００１７】
【発明の実施の形態】
図１は、雄スナップ１と雌スナップ２とによるスナップファスナーを示している。雄スナップ１は、突起部３を備えた雄型部材１Ａと、当該雄型部材１Ａを衣服等の可撓性膜体４ａに止着する合成樹脂製のリベット部材５ａとから構成されており、雌スナップ２は、合成樹脂製雌型部材２Ａと、当該雌型部材２Ａを衣服等の可撓性膜体４ｂに止着する合成樹脂製のリベット部材５ｂとから構成されている。
【００１８】
前記雌型部材２Ａの詳細な構成は、次のとおりである。即ち、図２〜図７に示すように、外側ほど低くなるように傾斜した後、下方へ垂下した断面形状の環状基板６の中央に、裏面側へ凹入し且つ上端側内周面には雄型部材１Ａの突起部３を係止する隆起部７が周方向に小間隙８を隔てて形成された雌型嵌合部９を連設すると共に、この雌型嵌合部９の底壁１０の中央には、可撓性膜体４ｂの片側から打ち込まれるリベット部材５ｂの突起１１を挿入してカシメ止めするための貫通孔１２を形成してある。
【００１９】
環状基板６裏面と雌型嵌合部との間に形成された溝１３には、前記隆起部７，７間の小間隙８に対応する位置において雌型嵌合部９と環状基板６とを連結する複数（図示の例では６枚）の放射状のリブ１４を形成してある。
【００２０】
前記隆起部７と環状基板６との接続部位Ｐを環状基板６よりも薄肉に形成する一方、前記各隆起部７の下方で且つリブ１４，１４同士の間に位置する周壁部分（隆起部７とリブ１４，１４と底壁１０とで囲まれた周壁部分）を、厚さが０．６mm以下の薄膜状１６に形成してある。
【００２１】
上記の構成によれば、雄型部材１Ａの突起部３とのスナップ作用時、雌型嵌合部９の弾性変形に対する抵抗となる部位、つまり、従来の合成樹脂製雌型部材において隆起部の下方に位置していた円筒状の周壁部分が薄膜状１６に形成されているので、隆起部７の半径方向への弾性変形が殆ど抵抗なく行われ、軽微な操作力によっても容易に行われることになる。
【００２２】
しかも、隆起部７と環状基板６との接続部位Ｐが薄肉に形成されていることと、隆起部７の下方が薄膜状１６に形成されていることとによって、雄型部材１Ａの突起部３とのスナップ作用時、図８に実線と仮想線で示すように、隆起部７は薄肉の接続部位Ｐを中心にして揺動するように弾性変形するので、半径方向だけでなく、上下方向（軸芯方向）へも弾性変形することが可能となる。
【００２３】
従って、隆起部の下方に開口部を形成した場合に比しても遜色ない程、確実な嵌合ならびに嵌合離脱の作用が得られ、雌型嵌合部９の開口端側の内径や雄型部材１Ａの突起部３の先端側の外径に多少の製作誤差があっても、嵌合が不能になったり、嵌合離脱が困難になったりすることを防止できるのである。
【００２４】
また、上記の雌型部材２Ａを合成樹脂の射出成形法で製造するにあたっては、図９、図１０に示すように、雌型部材２Ａの裏面側を成形する固定側の金型１７Ａと、雌型部材２Ａの表面側を成形する可動側の金型１７Ｂとの間に形成される成形用空間Ｓ₁にゲート１８から溶融樹脂１９を注入するのであるが、隆起部の下方に開口部を形成する場合のように、射出成形用の固定側金型と可動側金型の一部を密着させて摺動面とする必要がなく、当該摺動面に相当する部位に、図１０の（イ）に示すように、薄膜の厚みに相当する薄膜部成形用の隙間Ｓ₂が形成されることになるから、射出成形の都度、金型１７Ａ、１７Ｂが、図１０の（イ）に示す状態と、（ロ）に示す状態とを繰り返しても、図１３に示したような摺動面の磨耗が生ぜず、同一金型１７Ａ、１７Ｂによる大量生産が可能となり、製造コスト上、有利である。
【００２５】
尚、上述した薄膜状１６の部分の厚さは、厚すぎると、この部位の剛性が増して、隆起部７の半径方向への弾性変形に対する抵抗が大きくなり、薄すぎると、金型間の薄膜部成形用隙間Ｓ₂への溶融樹脂の注入が困難になるので、０．６mm〜０．３mm程度（好ましくは、０．５mm以下）に設定することが望ましい。隆起部７と環状基板６との接続部位Ｐの厚さは、環状基板６よりも薄ければ足り、任意に設定できるが、実用上は、薄膜状１６の部分の厚さと同様に、０．６mm〜０．３mm程度に設定することが望ましい。また、薄膜状１６の部分と接続部位Ｐの厚さは、互いに一致させてもよく、例えば、前者を０．５mm、後者を０．３mmに設定したり、或いは、その逆に、前者を０．３mm、後者を０．５mmに設定するといったように、両者の厚さを異ならせてもよい。
【図面の簡単な説明】
【図１】本発明に係る合成樹脂製雌型部材を用いて構成されたスナップファスナーの断面図である。
【図２】合成樹脂製雌型部材の平面図である。
【図３】合成樹脂製雌型部材の側面図である。
【図４】合成樹脂製雌型部材の底面図である。
【図５】図２のＡ−Ａ線断面図である。
【図６】図２のＢ−Ｂ線断面図である。
【図７】図３のＣ−Ｃ線断面図である。
【図８】作用の説明図である。
【図９】製造時の作用を説明するための射出成形用金型の概略断面図である。
【図１０】製造時の作用を説明するための射出成形用金型の概略断面図である。
【図１１】参考例を示す断面図である。
【図１２】参考例の作用の説明図である。
【符号の説明】
２Ａ…合成樹脂製雌型部材、６…環状基板、７…隆起部、８…小間隙、９…雌型嵌合部、１０…底壁、１２…貫通孔、１３…溝、１４…リブ、１６…薄膜状。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin female member for constituting a female snap of a snap fastener, and more specifically, after being inclined so as to become lower toward the outer side, it is recessed into the back surface side at the center of an annular substrate hanging downward. In addition, a female fitting portion in which a protruding portion that locks the protruding portion of the male member is formed on the inner peripheral surface of the upper end side with a small gap in the circumferential direction is provided continuously. A through-hole is formed in the center of the bottom wall of the flexible film body to insert and insert a protrusion of a rivet member that is driven from one side of the flexible membrane body, and between the annular substrate back surface and the female fitting portion. Improvement of a synthetic resin female mold member for a snap fastener in which a plurality of ribs connecting the female mold fitting portion and the annular substrate are formed in the formed groove at a position corresponding to the small gap between the raised portions. It is about technology.
[0002]
[Prior art]
In general, in this type of synthetic resin female member, the inner diameter of the female fitting portion on the opening end side projects the protruding portion from the inner peripheral surface, so that the outer diameter on the distal end side of the protruding portion of the male member Is smaller than Then, when the protruding portion of the male member is fitted and detached, the raised portion is pressed radially outward by the protruding portion, so that the female fitting portion resists the elastic restoring force in the radial direction. It is comprised so that it may expand to a diameter.
[0003]
However, in the conventional synthetic resin female member, a cylindrical peripheral wall portion is located below the raised portion, and this peripheral wall portion becomes a resistance against the elastic deformation of the female fitting portion. The fitting (snap action) tends to be tight. Therefore, if there is even a slight manufacturing error in the inner diameter of the female fitting part on the open end side or the outer diameter of the male part projection, the fitting may become impossible or impossible. As a result, it may be difficult to detach and fit.
[0004]
[Problems to be solved by the invention]
As a solution to the above-mentioned conventional drawbacks, the present inventor has already developed a synthetic resin female member for a snap fastener as follows. As shown in FIG. 11, the synthetic resin female mold member is inclined so as to become lower toward the outer side, and is then recessed into the back surface side at the center of the annular substrate 6 hanging downward, and on the inner peripheral surface on the upper end side. The ridge 7 for locking the protrusion of the male member is provided with a female fitting portion 9 formed with a small gap 8 in the circumferential direction, and a bottom wall 10 of the female fitting portion 9. A through-hole 12 is formed in the center of the flexible film body to insert and insert a projection of a rivet member that is driven from one side of the flexible membrane body, and is formed between the back surface of the annular substrate and the female fitting portion. The groove 13 is formed of a synthetic resin for a snap fastener in which a plurality of radial ribs 14 for connecting the female fitting portion 9 and the annular substrate 6 are formed at positions corresponding to the small gaps 8 between the raised portions. The female member 2 </ b> A has a connection portion P between the raised portion 7 and the annular substrate 6 thinner than the annular substrate 6. While formed, during and ribs 14, 14 with each other below said raised portion 7, is characterized in that to form the opening 15 which opens radially.
[0005]
According to the above configuration, at the time of snap action with the protrusion of the male member, the portion that becomes a resistance to the elastic deformation of the female fitting portion, that is, below the raised portion in the conventional synthetic resin female member Since the opening 15 that is opened in the radial direction is formed in a portion corresponding to the cylindrical peripheral wall portion that has been formed, the protruding portion 7 can be easily elastically deformed in the radial direction.
[0006]
Moreover, the projecting portion 3 of the male member 1A is formed by the fact that the connecting portion P between the raised portion 7 and the annular substrate 6 is formed thin and the opening 15 is formed below the raised portion 7. 12, as shown by a solid line and an imaginary line in FIG. 12, the raised portion 7 is elastically deformed so as to oscillate around the thin connection portion P, so that not only the radial direction but also the vertical direction ( It can be elastically deformed in the axial direction.
[0007]
Therefore, even if there is some manufacturing error in the inner diameter of the opening end side of the female fitting part and the outer diameter of the protrusion part of the male member, it becomes impossible to fit or the fitting is difficult to remove. It can be prevented from becoming.
[0008]
As described above, forming the connection portion P between the raised portion 7 and the annular substrate 6 to be thin and forming the opening 15 below the raised portion 7 include fitting with the protrusion of the male member and Although it is very preferable to ensure the action of fitting and disengaging, as a result of many trial experiments, if the opening 15 is formed below the raised portion 7, the following problems occur in manufacturing. There was found.
[0009]
That is, a synthetic resin female mold member for a snap fastener is generally between a fixed mold that molds the back side of the female mold member and a movable mold that molds the front side of the female mold member. A portion corresponding to a cylindrical peripheral wall portion that is manufactured by an injection molding method in which a molten resin is injected into a molding space to be formed and is located below a raised portion in a conventional synthetic resin female mold member Further, in forming the opening 15 opened in the radial direction, as shown in FIG. 13, the mold portion for molding the outer peripheral surface of the female fitting portion of the mold 17A on the fixed side, Of the movable mold 17B, the mold part that molds the inner peripheral surface of the female fitting part is brought into close contact locally at the opening forming position so that the molten resin is not injected into the contact part X. It is necessary to.
[0010]
Therefore, each time the injection molding is performed, the fixed mold 17A and the movable mold 17B slide on each other at the contact portion X described above, and the sliding surfaces of the molds 17A and 17B wear quickly. , Mass production with the same molds 17A and 17B is difficult, which is disadvantageous in terms of manufacturing cost.
[0011]
The present invention improves this point, and at the time of snap action with the protrusion of the male member, the portion that becomes a resistance against the elastic deformation of the female fitting portion, that is, in the conventional synthetic resin female member, In the part corresponding to the cylindrical peripheral wall part located below, it is possible to perform the action of fitting and detaching surely as much as compared with the case where an opening part opened in the radial direction is comparable, Nevertheless, it is an object of the present invention to provide a synthetic resin female die member for a snap fastener that is advantageous in terms of manufacturing cost, which enables mass production using the same die while suppressing wear of the injection molding die.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the technical means taken by the present invention are as follows. That is, the synthetic resin female mold member for a snap fastener according to the present invention is inclined so as to become lower toward the outer side, and then recessed into the center of the annular substrate hanging downward and on the inner peripheral surface on the upper end side. Is provided with a female fitting portion in which a protruding portion for locking the protruding portion of the male member is formed with a small gap in the circumferential direction, and at the center of the bottom wall of the female fitting portion, A through-hole is formed to insert a protrusion of a rivet member to be driven from one side of the flexible membrane body and fasten it, and the groove formed between the back surface of the annular substrate and the female fitting portion A synthetic resin female member for a snap fastener, in which a plurality of ribs for connecting a female fitting portion and an annular substrate are formed at a position corresponding to a small gap between the portions, the raised portion and the annular substrate While the connecting part is formed thinner than the annular substrate, One of the peripheral wall portion located between the ribs to each other is characterized in that the form of a thin film.
[0013]
According to the above configuration, at the time of snap action with the protrusion of the male member, the portion that becomes a resistance to the elastic deformation of the female fitting portion, that is, below the raised portion in the conventional synthetic resin female member Since the cylindrical peripheral wall portion that has been formed is formed into a thin film, the resistance to the elastic deformation of the raised portion in the radial direction becomes extremely small.
[0014]
In addition, since the connecting portion between the raised portion and the annular substrate is formed thin, and the peripheral wall portion below the raised portion is formed in a thin film shape, the raised portion is not only in the radial direction but also in the vertical direction. It is possible to elastically deform in the direction (axial direction).
[0015]
Therefore, as compared with the case where the opening is formed below the raised portion, it is possible to obtain a secure fitting and fitting release action, so that the inner diameter of the female fitting portion on the opening end side and the male die can be obtained. Even if there is some manufacturing error in the outer diameter on the tip side of the protruding portion of the member, it is possible to prevent the fitting from becoming impossible or the fitting from being removed.
[0016]
However, unlike the case where the opening is formed below the raised portion, there is no need to make a part of the fixed side mold for injection molding and the part of the movable side die in close contact with each other. Since a gap for forming the thin film part corresponding to the thickness of the thin film is formed in the part corresponding to, the wear of the injection mold is suppressed, and mass production with the same mold becomes possible. This is advantageous in terms of cost.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a snap fastener with a male snap 1 and a female snap 2. The male snap 1 is composed of a male member 1A having a protrusion 3 and a synthetic resin rivet member 5a for fastening the male member 1A to a flexible film body 4a such as clothes. The female snap 2 is composed of a synthetic resin female member 2A and a synthetic resin rivet member 5b for fastening the female member 2A to a flexible film body 4b such as clothes.
[0018]
The detailed configuration of the female member 2A is as follows. That is, as shown in FIG. 2 to FIG. 7, after being inclined so as to become lower toward the outside, in the center of the annular substrate 6 having a sectional shape that hangs downward, it is recessed on the back surface side and on the inner peripheral surface on the upper end side. A raised portion 7 that locks the protruding portion 3 of the male member 1A is provided with a female fitting portion 9 formed in a circumferential direction with a small gap 8 therebetween, and a bottom wall of the female fitting portion 9 A through-hole 12 is formed in the center of 10 for inserting and inserting the protrusion 11 of the rivet member 5b driven from one side of the flexible film body 4b.
[0019]
In the groove 13 formed between the back surface of the annular substrate 6 and the female fitting portion, the female fitting portion 9 and the annular substrate 6 are provided at a position corresponding to the small gap 8 between the raised portions 7, 7. A plurality of (six in the illustrated example) radial ribs 14 to be connected are formed.
[0020]
The connecting portion P between the raised portion 7 and the annular substrate 6 is formed thinner than the annular substrate 6, while the peripheral wall portion (the raised portion 7 is located below the raised portions 7 and between the ribs 14, 14. And a peripheral wall portion surrounded by the ribs 14 and 14 and the bottom wall 10) is formed in a thin film shape 16 having a thickness of 0.6 mm or less.
[0021]
According to the above configuration, at the time of snap action with the protrusion 3 of the male member 1A, the portion that becomes the resistance against the elastic deformation of the female fitting portion 9, that is, the raised portion of the conventional synthetic resin female member, Since the cylindrical peripheral wall portion located below is formed in the thin film shape 16, elastic deformation in the radial direction of the raised portion 7 can be performed with little resistance and can be easily performed even with a slight operating force. become.
[0022]
In addition, the connecting portion P between the raised portion 7 and the annular substrate 6 is formed thin, and the lower portion of the raised portion 7 is formed in a thin film shape 16, thereby causing the protruding portion 3 of the male member 1 </ b> A. 8, as shown by a solid line and a virtual line in FIG. 8, the raised portion 7 is elastically deformed so as to oscillate around the thin connection portion P, so that not only the radial direction but also the vertical direction ( It can be elastically deformed in the axial direction.
[0023]
Accordingly, the engagement and disengagement can be performed more reliably than the case where the opening is formed below the raised portion, and the inner diameter of the female fitting portion 9 on the opening end side and the male can be obtained. Even if there is a slight manufacturing error in the outer diameter on the tip side of the protrusion 3 of the mold member 1A, it is possible to prevent the fitting from becoming impossible or the fitting from being removed.
[0024]
Further, in manufacturing the female mold member 2A by the synthetic resin injection molding method, as shown in FIGS. 9 and 10, a fixed mold 17A for molding the back side of the female mold member 2A, and a female Although the molding space S ₁ formed between the movable side of the mold 17B for molding the surface side of the molding member 2A is to inject molten resin 19 from the gate 18, an opening below the ridge There is no need to make a part of the fixed mold for injection molding and a part of the movable mold in close contact with each other as a sliding surface, as shown in FIG. ), A thin film portion forming gap S ₂ corresponding to the thickness of the thin film is formed, so that the molds 17A and 17B are in the state shown in FIG. Even if the state shown in (b) is repeated, wear of the sliding surface as shown in FIG. Mass production by the single dies 17A and 17B is possible, which is advantageous in terms of manufacturing cost.
[0025]
If the thickness of the thin film-like portion 16 described above is too thick, the rigidity of this portion increases and resistance to elastic deformation in the radial direction of the raised portion 7 is increased. since the injection of molten resin into a thin film portion forming a gap S ₂ becomes difficult, about 0.6Mm～0.3Mm (preferably, 0.5 mm or less) is preferably set to. The thickness of the connecting portion P between the raised portion 7 and the annular substrate 6 is only required to be thinner than the annular substrate 6 and can be set arbitrarily. It is desirable to set to about 6 mm to 0.3 mm. The thickness of the thin film-like portion 16 and the connecting portion P may be equal to each other. For example, the former is set to 0.5 mm and the latter is set to 0.3 mm, or vice versa. The thicknesses of the two may be different, such as .3 mm and the latter set to 0.5 mm.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a snap fastener constructed using a synthetic resin female member according to the present invention.
FIG. 2 is a plan view of a female member made of synthetic resin.
FIG. 3 is a side view of a synthetic resin female member.
FIG. 4 is a bottom view of a female member made of synthetic resin.
FIG. 5 is a cross-sectional view taken along line AA in FIG.
6 is a cross-sectional view taken along line BB in FIG.
7 is a cross-sectional view taken along the line CC of FIG. 3;
FIG. 8 is an explanatory diagram of the operation.
FIG. 9 is a schematic cross-sectional view of an injection mold for explaining the operation during production.
FIG. 10 is a schematic cross-sectional view of an injection mold for explaining the operation at the time of manufacture.
FIG. 11 is a cross-sectional view showing a reference example.
FIG. 12 is an explanatory diagram of the operation of the reference example.
[Explanation of symbols]
2A ... Synthetic resin female member, 6 ... annular substrate, 7 ... raised portion, 8 ... small gap, 9 ... female mold fitting portion, 10 ... bottom wall, 12 ... through hole, 13 ... groove, 14 ... rib, 16 ... Thin film.

Claims

After inclining so as to be lower toward the outer side, a ridge that is recessed in the back surface and engages the protrusion of the male member in the circumferential direction in the center of the annular substrate that hangs downward is provided in the circumferential direction. A female fitting part formed with a small gap is provided continuously, and a protrusion of a rivet member that is driven from one side of the flexible film body is inserted into the center of the bottom wall of the female fitting part. A through hole is formed between the back surface of the annular substrate and the female fitting portion, and the groove formed between the female fitting portion and the female fitting portion is annular at a position corresponding to the small gap between the raised portions. A synthetic resin female member for a snap fastener having a plurality of ribs for connecting to a substrate, wherein a connecting portion between the raised portion and the annular substrate is formed thinner than the annular substrate, The peripheral wall part located below the part and between the ribs is formed in a thin film shape. Synthetic resin female member of the snap fastener to symptoms.