JP3917071B2

JP3917071B2 - Heat-resistant power plug

Info

Publication number: JP3917071B2
Application number: JP2002373694A
Authority: JP
Inventors: 邦弘山本
Original assignee: 邦弘山本
Priority date: 2002-12-25
Filing date: 2002-12-25
Publication date: 2007-05-23
Anticipated expiration: 2022-12-25
Also published as: JP2004206996A

Description

【０００１】
【発明の属する技術分野】
本発明は、電源コンセントに差し込み、電気機器類に電力を供給するための電源プラグに関し、更に詳しくは、電源コンセントの差込穴に差し込まれる端子部材の突出端面部分に耐熱性合成樹脂材料によって成形した耐熱性中子を備え、且つ前記端子部材の突出部根元を、コンセントの差込穴内に挿入される絶縁スリーブで被覆し、トラッキング火災を防止するようにした電源プラグに関する。
【０００２】
【従来の技術】
一般に、高電圧対応用の電源プラグとしては、コンセントの差込穴に挿し込む端子部材の突出部分に耐熱性合成樹脂材をもってモールド成形された耐熱性の中子を備え、該中子に端子部材を貫通させ、端子部材と電源コードとの接続部分および前記中子を埋め込んで、ポリ塩化ビニル樹脂などの熱可塑性合成樹脂材によるプラグ本体を成形した耐高圧電源用の電源プラグが知られている。
【０００３】
この従来の電源プラグは、中子を端子部材突出面に露出させて位置させることにより、端子部材とコンセントの接触子との間で生じる熱に対して発火や変形が発生し難い構造としている。
【０００４】
また、コンセントに差し込まれた端子部材の根元部が露出していると、その露出部分に埃が堆積し、端子部材間が短絡し発火するというトラッキング火災が発生する虞があることから、近年、端子部材の突出部根元外周にコンセントの差込穴に挿入される絶縁スリーブを嵌め付け、これによって差し込み状態にある時に端子部材が露出しない構造としたものが知られている。
【０００５】
これらの従来技術に関するものとして特許文献１に記載の構造のものがあり、この電源プラグは、図９に示すように、中子１をプラグ本体２の端面に露出させて埋め込むとともに、中子１の端板部１ａに開口させた端子部材貫通孔１ｂに絶縁スリーブ３が挿入され、該絶縁スリーブ３内に端子部材４を貫通させている。
【０００６】
端子部材４にはプラグ内埋め込み側端部に電源コード５が固着されて電気接続されている。また、端子部材４には図１０に示すようにその両側縁に、該端子部材４を中子１に対して位置決めさせるための段部７と、端子部材４に対して絶縁スリーブを位置決めさせる段部６とが間隔を隔てて設けられ、段部６より埋め込み側端部側がプラグ本体２を構成している軟質合成樹脂材２ａ内に埋め込まれている。
【０００７】
この電源コネクタの製造は、中子１及び絶縁スリーブ３をプラグ本体２とは別に予めモールド成形しておき、端子部材４に絶縁スリーブ３を嵌め合わせ、これを中子１にセットした状態でプラグ本体成型用の型内にセットし、これに軟質合成樹脂材を注入することにより、プラグ本体２内に各部材を埋め込んだ状態に一体化させるようにしている。
【０００８】
【特許文献】
特開平１０−３０８２５１号公報
【０００９】
【発明が解決しようとする課題】
上述した従来の耐熱型の電源プラグにおいては、予め別体として耐熱性合成樹脂をもって成形した中子１の端子部材貫通孔１ｂの内面と端子部材４の外面との間に絶縁スリーブ３が介在された構造となっているため、端子部材貫通孔１ｂと端子部材４との間に微細な隙間が生じる。
【００１０】
このため、端子部材４のガタツキを防止する必要から、プラグ本体２を形成した軟質合成樹脂材２ａ内に埋め込まれる部分、即ち図９における長さＬ１部分を長く必要とする。その結果、電源プラグ全体の長さＬ２が長くなり、全体形状が大きくならざるを得ないという問題があった。
【００１１】
本発明は上述の如き従来の問題に鑑み、中子及び絶縁スリーブを別々に成形し、これらと端子部材とを組み合わせた状態でプラグ本体樹脂に埋め込むようにした耐熱型の電源プラグにおいて、端子部材と中子及び絶縁スリーブとの結合が強固で、端子部材のプラグ内埋め込み側の長さが短くてもガタツキが生じることなく、全体として小型化できる電源プラグの提供を目的としたものである。
【００１２】
【課題を解決するための手段】
上述の如き従来の問題を解決し、所期の目的を達成するための請求項１に記載の発明の特徴は、絶縁性合成樹脂材料からなるプラグ本体と、該プラグ本体の差込側端面に先端部を突出させた複数の板状をした端子部材とを有し、前記プラグ本体はその差込側端面に露出させた耐熱性合成樹脂材からなる中子と、該中子を一体に埋め込んだ軟質性合成樹脂材からなる本体成形樹脂部とをもって構成され、前記端子部材は前記中子を貫通して先端側が該プラグ本体の端面から突出されるとともに、該突出部分の根元部外周にはコンセントの差込穴内に挿入される絶縁スリーブが嵌めつけられている耐熱型電源プラグにおいて、前記端子部材は、前記プラグ本体内に埋め込まれた基端側の両側部に位置決め用突部が一体に形成され、その各位置決め用突部より先端側に切欠状凹部が備えられ、前記絶縁スリーブは、基端側が前記端子部材の位置決め用突部に当接されるとともに、前記端子部材の切欠状凹部に対応する位置に該絶縁スリーブ内外に連通開口する窓穴部が形成され、前記中子は、プラグ本体の差込側端面に露出した端板部に端子部材を嵌合させる端子部材貫通孔を備え、該貫通孔の端板部背面側開口縁部に、該縁部を切り欠いた形状のプラグ本体樹脂流入路を備え、該中子に対し該端子部材を貫通させて支持させ、前記絶縁スリーブの窓穴部を該中子の背面に露出させ、前記プラグ本体樹脂流入路を通じて絶縁スリーブの窓穴部及び端子部材の切欠状凹部に本体成形樹脂部の軟質合成樹脂材料を流入充填させて、該合成樹脂材料により該絶縁スリーブの窓穴部及び切欠状凹部内の空間が埋められていることにある。
【００１３】
このように構成することにより、本体成形樹脂部をモールド成形する際に合成樹脂材料が絶縁スリーブの窓穴部及び端子部材の切欠状凹部内に入り込んで固化し、これらをより強固に結合させることとなり、端子部材は短い埋め込み長さであってもガタツキがなくグラツキのない安定した固定がなされる。
また、中子は、プラグ本体の差込側端面に露出した端板部に端子部材を嵌合させる端子部材貫通孔を備え、該貫通孔の端板部背面側開口縁部に、該縁部を切り欠いた形状のプラグ本体樹脂流入路を備え、該流入路を通じて絶縁スリーブの窓穴部及び端子部材の切欠状凹部に本体成形樹脂部の合成樹脂材料を流入充填させて、該合成樹脂材料により該絶縁スリーブの窓穴部及び切欠状凹部内の空間が埋められている構成により、中子の端子部材貫通孔内でのガタツキが防止されるとともに、中子、絶縁スリーブ及び端子部材間の結合がより強固になる。
【００１４】
また、請求項２に記載の発明の特徴は、上記請求項１の構成に加え、絶縁スリーブの基端部外周には、端子部材の位置決め用突部に対応する位置に半径方向に張り出した係止用突片を一体に有し、該突片を前記位置決め用突部に当接させるとともに、該係止用突片を介して前記位置決め用突部を中子背面側に位置決めさせたことにある。
【００１５】
このように構成することにより、絶縁スリーブと端子部材が、中子の同一部分で位置決めされることとなり、構造が簡略化される。
【００１８】
請求項３に記載の発明の特徴は、上記請求項１又は２の構成に加え、中子は、端板部背面外周に筒状をしたスカート部を備え、該スカート部の中央を二分する配置に仕切りを備え、該仕切りの両側のスカート部内に端子部材貫通孔を開口させるとともに、前記仕切りは前記各端子部材貫通孔に嵌合させた両端子部材の基端部に接続した各電源コードのリード線露出部間を仕切る長さに形成されていることにある。
【００１９】
このように構成することにより、端子部材間が耐熱性樹脂材料による仕切によって仕切られるため、一方の加熱が他方に影響を及ぼすことを防止できるとともに、中子表面に沿った端子間沿面距離が長くなり、絶縁性が高くなる。
【００２０】
【発明の実施の形態】
次に本発明の実施の形態を図１〜図８について説明する。
図において、符号１０は本発明に係る耐熱型の電源プラグであり、１１はプラグ本体、１１ａはプラグ本体１１を構成している軟質合成樹脂材からなる本体成形樹脂部であり、一例としてポリ塩化ビニルが使用されている。
【００２１】
プラグ本体１１内には、そのプラグ差込側端面に露出して中子１２が埋め込まれている。この中子１２は耐熱性合成樹脂材、一例としてメラミンフェノールをもって成形されており、図1〜図４に示すように、端板部１２ａとその背面周縁から背面側に延びる角筒状のスカート部１２ｂ、及びスカート部１２ｂ内を二分する仕切り１２ｃとが一体に成形されている。仕切り１２ｃはスカート部１２ｂ後端よりさらに背面側に突出されている。
【００２２】
中子１２の端板部１２ａには一対の端子部材貫通孔１３，１３が貫通開口されている。この貫通孔１３，１３は仕切り１２ｃによって仕切られたスカート部内空間１２ｄ，１２ｄにそれぞれ開口し、仕切り１２ｃを中央にした互いに対称な位置に設けられている。
【００２３】
各貫通孔１３の背面側開口縁の長辺部には、一方の短辺部即ち側縁側に片寄せた位置をテーパ―状に切り欠いた形状のプラグ本体樹脂流入路１３ａ，１３ａが形成されている。
【００２４】
各端子部材貫通孔１３内には端子部材１４が貫通されている。この端子部材１４は、図５、図６に示すように矩形の板状をなしており、導電性板材を打ち抜いて形成され、その基端部の両側縁には位置決め用突部１５，１５が段状に形成されているとともに、その両位置決め用突部１５，１５の端子部材先端側位置には、端子部材１４の縁部を切り欠いた形状の切欠状凹部１６，１６が互いに対称な配置に形成されている。
【００２５】
端子部材１４の基端部には電源コード接続部１７が一体に形成されている。この電源コード接続部１７は左右に一対のリード線挟持片１７ａ，１７ａを有し、両リード線挟持片１７ａ，１７ａを互いに向き合う方向に折り曲げることによって電源コード１８のリード線１８ａを挟持して端子部材１４と電源コード１８との固着及び電気的接続がなされるようになっている。
【００２６】
端子部材１４には絶縁スリーブ１９が嵌め合わされている。この絶縁スリーブ１９は軟質合成樹脂をもってモールド成形されており、図６、図７に示すように断面長方形の角筒状をしており、その内面は端子部材１４が略密な状態で嵌合される形状及び大きさに、外面が中子の端子部材貫通孔１３内に略密な状態で嵌め合わされる形状及び大きさに形成されている。
【００２７】
絶縁スリーブ１９には、その先端側外周縁には先細りのテーパー面２０が形成されているとともに、基端部外周には、前後面のそれぞれ互い違いに側縁側に片寄せた位置から側縁に掛けて連続した一対の係止用突片２１，２１が互いに対称な配置に突設されている。また、前記基端部外周の前後面には係止用突片２１，２１とは反対側に片寄せた位置に樹脂流入用窓穴部２２，２２が互いに対称な配置に開口されている。
【００２８】
この窓穴部２２，２２は、絶縁スリーブ１９を端子部材１４の外周に先端側から嵌め合わせ、該絶縁スリーブ１９の基端側が端子部材１４の位置決め用突部１５，１５に当接させた状態で、各切欠状凹部１６，１６と連通するように対応させた位置に形成されている。
【００２９】
このように構成される端子部材１４及び絶縁スリーブ１９は、図２に示すように、端子部材１４の電源コード接続部１７に電源コード１８を連結させるとともに、該端子部材１４に絶縁スリーブ１９をその基端部が位置決め用突部１５，１５に当接させて嵌め合わせ、この状態で中子１２の背面側から貫通孔１３に挿通させ、絶縁スリーブ１９の係止用突片２１，２１を貫通孔１３の背面側開口縁部に当接させる。
【００３０】
このようにして端子部材１４の位置決め用突部１５，１５を、係止用突片２１，２１を介して中子１２の端板部１２ａの背面に対して位置決めさせ、絶縁スリーブ１９を端子部材１４の根元部外周を被覆する配置に位置決めさせる。
【００３１】
尚、この状態で両端子部材１４，１４の電源コード接続部１７を含む中子背面側突出部及び電源コード１８のリード線露出部間に前述した仕切り１２ｃを位置させている。これによって端子部材１４，１４間の中子表面沿面距離を長くし、絶縁性を高めると共に、一方の端子部材１４における発熱が他方の端子部材に影響を及ぼし難くいようにしている。
【００３２】
この状態でこれらを図示しないが、プラグ本体モールド成形型内の所定の位置に収容し、該型内にプラグ本体成形用の溶融合成樹脂を注入し、その内部に、端子部材１４及び絶縁スリーブ１９の各基端側を埋め込み、中子１２の端板部１２ａを差込側端面に露出させてプラグ本体１１内に埋め込み、耐熱型の電源プラグを形成している。
【００３３】
このようにしてプラグ本体１１成型用の樹脂を金型内に注入することにより、中子１２のスカート部１２ｂ内に流入した溶融樹脂は、中子端板部１２ａの貫通孔縁部に形成されている本体樹脂流入路１３ａから絶縁スリーブ１９樹脂流入窓２２を通して端子部材１４の切欠状凹部１６内に入り込み、これらの空間を埋める。これによって端子部材１４と中子１２及び絶縁スリーブ１９が強固に一体化されることとなり、特に端子部材１４のプラグ本体成形樹脂部１１ａに埋め込まれる部分の長さが短い場合であってもガタツキの生じない電源プラグが得られる。
【００３４】
尚、このようにして成形された電源プラグの絶縁スリーブ１９は、図８に示すように端子部材１４がコンセント３０の差込穴３１に完全に差し込まれた状態で、先端部が前記差込穴３１内に挿入されるがコンセント３０内のターミナル３２の端子部材接触部までは達しない長さに形成されている。
【００３５】
【発明の効果】
上述のように、本発明に係る耐熱型電源プラグは、耐熱性合成樹脂によって予めモールド成形されている中子に、絶縁スリーブを嵌めつけた端子部材を嵌合させて本体成形樹脂部のモールド成形によってプラグ本体部及び端子部材を一体化させる構造であっても、端子部材に切欠状凹部をそなえるとともに、絶縁スリーブに前記切欠凹部に連通する樹脂流入用窓穴部を備え、これらが本体成形樹脂部の軟質合成樹脂材料により埋めることにより、全体の一体化がより強固になされ、端子部材の埋め込み長さが短くても、ガタツキの生じない強固な結合が得られ、プラグ形状を小型化できる。
【図面の簡単な説明】
【図１】本発明に係る耐熱型電源プラグの実施の一例の全体構造の断面図である。
【図２】図1に示す耐熱型電源プラグの中子、端子部材、絶縁スリーブ及び電源コードの組み合わせ状態を示す断面図である。
【図３】図1に示す耐熱型電源プラグの中子を示しており、（ａ）は平面図、（ｂ）は正面図、（ｃ）は背面図、（ｄ）は側面図である。
【図４】図1に示す耐熱型電源プラグの中子を示しており、（ｅ）は図３中のＡ−Ａ断面図、（ｆ）は図３中のＢ−Ｂ断面図、（ｇ）は図３中のＣ−Ｃ断面図、（ｈ）は図３中のＤ−Ｄ断面図である。
【図５】図1に示す耐熱型電源プラグの電源コード接続前の端子部材を示しており、（ａ）は平面図、（ｂ）は側面図、（ｃ）は背面図である。
【図６】図1に示す耐熱型電源プラグの端子部材と絶縁スリーブとの嵌合状態を示しており、（ａ）は平面図、（ｂ）は（ａ）図中のＥ−Ｅ断面図である。
【図７】図1に示す耐熱型電源プラグの絶縁スリーブをしめしており、（ａ）、（ｂ）は斜視方向を違えた斜視図である。
【図８】図1に示す耐熱型電源プラグのコンセントへの差込状態を示す部分省略断面図である。
【図９】従来の耐熱型電源プラグの一例を示す断面図である。
【図１０】同上の中子、端子部材及び絶縁スリーブの嵌合状態を示す断面図である。
【符号の説明】
１０電源プラグ
１１プラグ本体
１１ａ本体成形樹脂部
１２中子
１２ａ端板部
１２ｂスカート部
１２ｃ仕切り
１２ｄスカート部内空間
１３端子部材貫通孔
１３ａプラグ本体樹脂流入路
１４端子部材
１５位置決め用突部
１６切欠状凹部
１７電源コード接続部
１７ａリード線挟持片
１８電源コード
１８ａリード線
１９絶縁スリーブ
２０テーパー面
２１係止用突片
２２樹脂流入用窓穴部
３０コンセント
３１差込穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power plug for plugging into a power outlet and supplying power to electrical equipment, and more specifically, a protruding end surface portion of a terminal member inserted into an insertion hole of the power outlet is formed of a heat resistant synthetic resin material. The present invention relates to a power plug including the heat-resistant core and covering the base of the protruding portion of the terminal member with an insulating sleeve inserted into an insertion hole of an outlet so as to prevent a tracking fire.
[0002]
[Prior art]
Generally, as a power plug for high voltage, a heat-resistant core molded with a heat-resistant synthetic resin material is provided on a protruding portion of a terminal member that is inserted into an insertion hole of an outlet, and the terminal member is provided on the core. There is known a power plug for a high voltage resistant power source in which a plug body made of a thermoplastic synthetic resin material such as polyvinyl chloride resin is formed by embedding the connecting portion between the terminal member and the power cord and the core. .
[0003]
This conventional power plug has a structure in which ignition and deformation are not easily caused by heat generated between the terminal member and the contact of the outlet by positioning the core exposed on the protruding surface of the terminal member.
[0004]
In addition, if the base part of the terminal member inserted into the outlet is exposed, dust may accumulate on the exposed part, and there is a risk that a tracking fire may occur due to a short circuit between the terminal members. There is known a structure in which an insulating sleeve to be inserted into an insertion hole of an outlet is fitted to the outer periphery of the base of the protruding portion of the terminal member so that the terminal member is not exposed when in an inserted state.
[0005]
As related to these prior arts, there is one having a structure described in Patent Document 1. This power plug is embedded with the core 1 exposed on the end face of the plug body 2 as shown in FIG. The insulating sleeve 3 is inserted into the terminal member through hole 1 b opened in the end plate portion 1 a, and the terminal member 4 is passed through the insulating sleeve 3.
[0006]
A power cord 5 is fixedly connected to the terminal member 4 at the end of the plug embedded side. Further, as shown in FIG. 10, the terminal member 4 has stepped portions 7 for positioning the terminal member 4 with respect to the core 1 on both side edges and a step for positioning the insulating sleeve with respect to the terminal member 4. A portion 6 is provided at a distance from the step portion 6 , and an embedded side end portion side from the step portion 6 is embedded in a soft synthetic resin material 2 a constituting the plug body 2.
[0007]
In manufacturing the power connector, the core 1 and the insulating sleeve 3 are molded in advance separately from the plug main body 2, the insulating sleeve 3 is fitted to the terminal member 4, and the plug is set in the core 1. By setting in a mold for molding the main body and injecting a soft synthetic resin material into the mold, the members are integrated in the plug body 2 in an embedded state.
[0008]
[Patent Literature]
Japanese Patent Laid-Open No. 10-308251
[Problems to be solved by the invention]
In the above-described conventional heat-resistant power plug, the insulating sleeve 3 is interposed between the inner surface of the terminal member through hole 1b of the core 1 and the outer surface of the terminal member 4 which are previously molded separately from heat-resistant synthetic resin. Therefore, a fine gap is generated between the terminal member through hole 1b and the terminal member 4.
[0010]
Therefore, to the need to prevent rattling of the terminal member 4, the portion to be embedded in the soft synthetic resin material in 2a forming the plug body 2, i.e. require a longer length L1 portion in FIG. As a result, there has been a problem that the entire length L2 of the power plug becomes longer and the overall shape must be increased.
[0011]
In view of the conventional problems as described above, the present invention provides a terminal member in a heat-resistant power plug in which a core and an insulating sleeve are separately molded and embedded in a plug body resin in a state in which these and a terminal member are combined. It is an object of the present invention to provide a power plug that can be miniaturized as a whole without causing any backlash even when the length of the terminal member embedded side in the plug is short and the coupling between the core and the insulating sleeve is strong.
[0012]
[Means for Solving the Problems]
In order to solve the above-described conventional problems and achieve the intended object, the feature of the invention described in claim 1 is that a plug body made of an insulating synthetic resin material and a plug-side end face of the plug body are provided. A plurality of plate-like terminal members with projecting tips, and the plug body is integrally embedded with a core made of a heat-resistant synthetic resin material exposed on the end surface on the insertion side. The terminal member penetrates the core and the tip end protrudes from the end surface of the plug body, and on the outer periphery of the root of the protruding portion. In a heat-resistant power plug in which an insulating sleeve to be inserted into an insertion hole of an outlet is fitted, the terminal member has positioning protrusions integrally formed on both sides on the base end side embedded in the plug body. Formed and its each positioning A notch-shaped recess is provided on the distal end side from the protrusion, and the insulating sleeve is in contact with the positioning protrusion of the terminal member on the base end side, and the insulating sleeve is in a position corresponding to the notch-shaped recess of the terminal member. A window hole portion that communicates with the inside and outside of the sleeve is formed, and the core includes a terminal member through hole that fits a terminal member into an end plate portion that is exposed on the insertion side end surface of the plug body, and the end of the through hole the plate portion back side opening edge, comprising a plug body resin inlet passage having a shape cut out said edges, is supported by penetrating the pin member relative to said core, said the window hole portion of the insulating sleeve exposed on the back of the core, with the plug body through the resin inlet path cutout-like recesses of the window hole portion and the terminal member of the insulating sleeve is flowed filled with soft synthetic resin material of the body molding resin portion, said by the synthetic resin material Insulation sleeve window hole and cutout recess It lies in the fact that the space has been filled.
[0013]
By constituting in this way, when molding the main body molding resin part, the synthetic resin material enters into the window hole part of the insulating sleeve and the notch-like concave part of the terminal member, and solidifies them, thereby bonding them more firmly. Thus, even if the terminal member has a short embedding length, the terminal member can be stably fixed without rattling.
Further, the core includes a terminal member through hole for fitting a terminal member to the end plate portion exposed on the plug-side end surface of the plug body, and the edge portion on the end plate portion rear side opening edge of the through hole. A plug body resin inflow passage having a shape of notch, and through the inflow passage, the synthetic resin material of the body molding resin portion is inflow-filled into the window hole portion of the insulating sleeve and the notch-shaped recess of the terminal member, and the synthetic resin material With the configuration in which the space in the window hole portion and the notch-shaped recess portion of the insulating sleeve is filled, rattling in the terminal member through hole of the core is prevented, and between the core, the insulating sleeve, and the terminal member is prevented. Bonds become stronger.
[0014]
The invention according to claim 2 is characterized in that, in addition to the structure of claim 1, the outer periphery of the base end portion of the insulating sleeve projects radially in a position corresponding to the positioning protrusion of the terminal member. A stop protrusion is integrally formed, the protrusion is brought into contact with the positioning protrusion, and the positioning protrusion is positioned on the back side of the core via the locking protrusion. is there.
[0015]
By comprising in this way, an insulation sleeve and a terminal member will be positioned in the same part of a core, and a structure will be simplified.
[0018]
According to a third aspect of the present invention, in addition to the configuration of the first or second aspect , the core has a cylindrical skirt portion on the outer periphery of the back surface of the end plate portion, and is arranged to bisect the center of the skirt portion. Each of the power cords connected to the base ends of both terminal members fitted in the respective terminal member through holes, and the terminal member through holes are opened in the skirt portions on both sides of the partition. It exists in the length which partitions off between lead wire exposed parts.
[0019]
By comprising in this way, since between terminal members are partitioned by the partition by a heat resistant resin material, while being able to prevent one heating having influence on the other, the creeping distance between terminals along the core surface is long. As a result, the insulation becomes high.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS.
In the figure, reference numeral 10 is a heat-resistant power plug according to the present invention, 11 is a plug body, 11a is a body molding resin portion made of a soft synthetic resin material constituting the plug body 11, and polychlorinated as an example. Vinyl is used.
[0021]
A core 12 is embedded in the plug main body 11 so as to be exposed at the end surface on the plug insertion side. The core 12 is formed of a heat-resistant synthetic resin material, for example, melamine phenol. As shown in FIGS. 1 to 4, the end plate portion 12a and a rectangular tube-shaped skirt portion extending from the back surface periphery to the back surface side. 12b and a partition 12c that bisects the inside of the skirt portion 12b are integrally formed. The partition 12c protrudes further to the back side than the rear end of the skirt portion 12b.
[0022]
A pair of terminal member through holes 13, 13 are opened through the end plate portion 12 a of the core 12. The through-holes 13 and 13 are opened in the skirt portion inner spaces 12d and 12d partitioned by the partition 12c, respectively, and are provided at symmetrical positions with the partition 12c at the center.
[0023]
Plug main body resin inflow passages 13a and 13a are formed on the long side portion of the opening edge on the back side of each through-hole 13 in a shape in which one short side portion, that is, the side edge side of the through hole 13 is cut away in a tapered shape. ing.
[0024]
A terminal member 14 is passed through each terminal member through-hole 13. The terminal member 14 has a rectangular plate shape as shown in FIGS. 5 and 6 and is formed by punching a conductive plate material. Positioning protrusions 15 and 15 are formed on both side edges of the base end portion. The step-shaped recesses 16 and 16 are formed symmetrically with each other at the tip end side positions of the positioning protrusions 15 and 15, and the edge of the terminal member 14 is notched. Is formed.
[0025]
A power cord connecting portion 17 is integrally formed at the base end portion of the terminal member 14. The power cord connecting portion 17 has a pair of lead wire clamping pieces 17a and 17a on the left and right sides, and the lead wire 18a of the power cord 18 is clamped by bending both the lead wire clamping pieces 17a and 17a in a direction facing each other. The member 14 and the power cord 18 are fixed and electrically connected.
[0026]
An insulating sleeve 19 is fitted to the terminal member 14. The insulating sleeve 19 is molded with a soft synthetic resin and has a rectangular tube shape with a rectangular cross section as shown in FIGS. 6 and 7, and the inner surface of the insulating sleeve 19 is fitted in a substantially dense state. The outer surface is formed into a shape and a size that are fitted in the terminal member through hole 13 of the core in a substantially dense state.
[0027]
The insulating sleeve 19 is formed with a tapered surface 20 at the outer peripheral edge on the distal end side, and on the outer periphery of the base end portion, it is hung on the side edge from a position where the front and rear surfaces are alternately shifted to the side edge side. A pair of consecutive locking protrusions 21 and 21 protrude in a symmetrical arrangement. In addition, resin inflow window hole portions 22 are opened symmetrically on the front and rear surfaces of the outer periphery of the base end portion at positions shifted to the opposite side to the locking projections 21, 21.
[0028]
The window holes 22 and 22 are such that the insulating sleeve 19 is fitted to the outer periphery of the terminal member 14 from the front end side, and the base end side of the insulating sleeve 19 is in contact with the positioning protrusions 15 and 15 of the terminal member 14. Thus, they are formed at positions corresponding to the respective notch-shaped recesses 16 and 16 so as to communicate with each other.
[0029]
As shown in FIG. 2, the terminal member 14 and the insulating sleeve 19 configured in this way are connected to the power cord connecting portion 17 of the terminal member 14 and the insulating sleeve 19 is connected to the terminal member 14. The base end portions are brought into contact with the positioning projections 15 and 15 and fitted together. In this state, the base end portion is inserted into the through-hole 13 from the back side of the core 12 and penetrates the locking projection pieces 21 and 21 of the insulating sleeve 19. It is made to contact | abut to the back side opening edge part of the hole 13. FIG.
[0030]
In this way, the positioning projections 15 and 15 of the terminal member 14 are positioned with respect to the back surface of the end plate portion 12a of the core 12 via the locking projections 21 and 21, and the insulating sleeve 19 is connected to the terminal member. It positions to the arrangement | positioning which covers 14 base part outer periphery.
[0031]
In this state, the partition 12 c described above is positioned between the core rear side protruding portion including the power cord connecting portion 17 of both the terminal members 14 and 14 and the lead wire exposed portion of the power cord 18. As a result, the creepage distance between the core surfaces of the terminal members 14 and 14 is increased to improve insulation, and the heat generated in one terminal member 14 is unlikely to affect the other terminal member.
[0032]
In this state, although not shown, they are accommodated in a predetermined position in the plug body mold, a molten synthetic resin for molding the plug body is injected into the mold, and the terminal member 14 and the insulating sleeve 19 are inserted therein. The end plate portion 12a of the core 12 is exposed at the end surface on the insertion side and embedded in the plug main body 11 to form a heat-resistant power plug.
[0033]
By injecting the resin for molding the plug body 11 into the mold in this way, the molten resin flowing into the skirt portion 12b of the core 12 is formed at the edge of the through hole of the core end plate portion 12a. The main body resin inflow passage 13a enters the notch-shaped recess 16 of the terminal member 14 through the insulating sleeve 19 through the resin inflow window 22, and fills these spaces. As a result, the terminal member 14, the core 12 and the insulating sleeve 19 are firmly integrated. In particular, even when the length of the portion embedded in the plug body molding resin portion 11 a of the terminal member 14 is short, there is no backlash. A power plug that does not occur is obtained.
[0034]
Incidentally, the insulating sleeve 19 of the power plug formed in this way has the distal end portion thereof in the insertion hole with the terminal member 14 completely inserted into the insertion hole 31 of the outlet 30, as shown in FIG. It is formed in a length that is inserted into 31 but does not reach the terminal member contact portion of the terminal 32 in the outlet 30.
[0035]
【The invention's effect】
As described above, the heat-resistant power plug according to the present invention is formed by molding the body molding resin portion by fitting the terminal member fitted with the insulating sleeve into the core that is previously molded by the heat-resistant synthetic resin. Even if the plug body portion and the terminal member are integrated with each other, the terminal member is provided with a notch-shaped recess, and the insulating sleeve is provided with a resin inflow window hole portion that communicates with the notch recess. By filling the portion with a soft synthetic resin material, the overall integration is further strengthened, and even when the embedding length of the terminal member is short, a firm connection without rattling can be obtained, and the plug shape can be reduced in size.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of the overall structure of an example of a heat-resistant power plug according to the present invention.
2 is a cross-sectional view showing a combined state of a core, a terminal member, an insulating sleeve, and a power cord of the heat-resistant power plug shown in FIG.
3 shows a core of the heat-resistant power plug shown in FIG. 1, wherein (a) is a plan view, (b) is a front view, (c) is a rear view, and (d) is a side view.
4 shows the core of the heat-resistant power plug shown in FIG. 1, wherein (e) is a cross-sectional view taken along line AA in FIG. 3, (f) is a cross-sectional view taken along line BB in FIG. ) Is a cross-sectional view taken along the line CC in FIG. 3, and (h) is a cross-sectional view taken along the line DD in FIG.
5 shows a terminal member of the heat-resistant power plug shown in FIG. 1 before connection of a power cord, where (a) is a plan view, (b) is a side view, and (c) is a rear view.
6 shows a fitting state between the terminal member and the insulating sleeve of the heat-resistant power plug shown in FIG. 1, (a) is a plan view, and (b) is a sectional view taken along line EE in FIG. It is.
7 shows an insulating sleeve of the heat-resistant power plug shown in FIG. 1, and (a) and (b) are perspective views with different perspective directions.
FIG. 8 is a partially omitted cross-sectional view showing a state where the heat-resistant power plug shown in FIG. 1 is inserted into an outlet.
FIG. 9 is a cross-sectional view showing an example of a conventional heat-resistant power plug.
FIG. 10 is a cross-sectional view showing a fitting state of the core, the terminal member, and the insulating sleeve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Power plug 11 Plug main body 11a Main body molded resin part 12 Core 12a End plate part 12b Skirt part 12c Partition 12d Skirt inner space 13 Terminal member through-hole 13a Plug main body resin inflow path 14 Terminal member 15 Positioning protrusion 16 Notch-shaped recess 17 Power cord connecting portion 17a Lead wire clamping piece 18 Power cord 18a Lead wire 19 Insulating sleeve 20 Tapered surface 21 Locking protrusion 22 Resin inflow window hole 30 Outlet 31 Insertion hole

Claims

A plug body made of an insulating synthetic resin material; and a plurality of plate-like terminal members having tip portions protruding from the plug-side end face of the plug body, the plug body exposed at the plug-side end face A core made of a heat-resistant synthetic resin material, and a body molding resin portion made of a soft synthetic resin material in which the core is integrally embedded, and the terminal member penetrates the core and has a tip side thereof In the heat-resistant power plug that protrudes from the end face of the plug body, and an insulating sleeve that is inserted into the outlet hole of the outlet is fitted on the outer periphery of the base portion of the protruding portion,
The terminal member is integrally formed with positioning protrusions on both sides on the base end side embedded in the plug body, and a notch-like recess is provided on the distal end side from each positioning protrusion.
The insulating sleeve has a proximal end abutting against the positioning protrusion of the terminal member, and a window hole portion that is open to communicate with the inside and outside of the insulating sleeve is formed at a position corresponding to the notched recess of the terminal member.
The core includes a terminal member through-hole for fitting a terminal member to an end plate portion exposed on the plug-side end surface of the plug body, and the edge portion is disposed on the end plate portion rear side opening edge of the through-hole. includes a plug body resin inlet passage having a shape cut out, said core relative to the support by penetrating the terminal members, to expose the window hole portion of the insulating sleeve to the back of the tang,
Said plug body through resin inlet path cutout-like recesses of the window hole portion and the terminal member of the insulating sleeve is flowed filled with soft synthetic resin material of the body forming the resin portion, window holes portion and the notch of the insulating sleeve by said synthetic resin material A heat-resistant power plug characterized in that the space in the concave portion is filled.

On the outer periphery of the base end portion of the insulating sleeve, there is integrally provided a locking protruding piece projecting radially in a position corresponding to the positioning protrusion of the terminal member, and the protruding piece abuts on the positioning protrusion. The heat-resistant power plug according to claim 1, wherein the positioning protrusion is positioned on the core back side through the locking protrusion.

The core includes a cylindrical skirt portion on the outer periphery of the back surface of the end plate portion, includes a partition in an arrangement that bisects the center of the skirt portion, and opens terminal member through holes in the skirt portions on both sides of the partition, the divider according the to claim 1 or 2 is formed to a length that partition the lead wire exposed portions of the power cord connected to the base end portions of the terminal members is fitted into each pin member through hole Heat-resistant power plug.