JP3739667B2

JP3739667B2 - Saddle faucet and its drilling method

Info

Publication number: JP3739667B2
Application number: JP2001129431A
Authority: JP
Inventors: 茂樹松林
Original assignee: Kitz Corp
Current assignee: Kitz Corp
Priority date: 2001-04-26
Filing date: 2001-04-26
Publication date: 2006-01-25
Anticipated expiration: 2021-04-26
Also published as: JP2002323190A

Description

【０００１】
【発明の属する技術分野】
本発明は、上中下水道配管或はガス配管に適用する樹脂製本管に、不断水・不断ガスの状態で分岐管を接続するためのサドル分水栓及びサドル分水栓の穿孔方法に関する。
【０００２】
【従来の技術】
通常、水道用本管やガス本管を分岐する場合は、水道用本管等にサドル分水栓を固定し、この分水栓に分岐管を接続して分岐し、更には、本管の穿孔穴とサドル取付面との間に、ガスケットを装着して分水栓と穿孔穴との密封性を図るようにしている。この本管が鋳鉄管や鋼管等のように金属製配管であれば、上記のガスケットによってサドル取付面の密封性は保持される。ところが、本管がポリエチレン、ポリプロピレン等のような樹脂管の場合は、サドルをボルト・ナットで締付けた状態で長期間使用すると、樹脂管の残留応力等により、配管がクリープ変形してガスケットのシール性能が低下したり、または、地震等によりサドルに大きな外力を受けた場合、樹脂管に対してずれが生じるため、水等の流体がこの部分からリークする事態が起きる。そこで、これらの欠点を解決するため、従来より、特開平１０−１９６８７１号、特開平１１−２３８０号公報等に記載された対応策が提案されている。
【０００３】
このうち、特開平１０−１９６８７１号公報は、樹脂管にガスケットを介してサドル分水栓を取付け、更に、樹脂管の取付位置に穿孔具により分岐孔を形成し、その後、この分岐孔にインサートコアをねじ込むようにしている。また、特開平１１−２３８０号公報は、樹脂管にサドル分岐栓を取付け、次いで、樹脂管への穿孔と同時に、樹脂管とサドルとのずれを防止するスリーブを分岐孔に挿入する分岐工法である。
【０００４】
【発明が解決しようとする課題】
しかしながら、前者の公報は、第一段階で樹脂管に分岐孔を穿孔するため穿孔具による穿孔作業を必要とし、次いで、第二段階として、この分岐孔にコア装着具によりインサートコアを装着する作業を必要としていた。そのため、樹脂管に分岐管を接合して分岐する作業が煩雑となり、作業効率の点で良好といえるものではなかった。
【０００５】
後者の公報は、樹脂管を穿孔する穿孔刃には、分岐孔の穿孔に伴ってくり抜かれた樹脂管の切片を保持するための縮径部があり、この縮径部の存在により、穿孔具の刃先により形成される分岐孔の内径は、穿孔刃の先端に沿って小径とした先端を持つスリーブの外径よりも、その肉厚分以上に小さくなるので、スリーブと分岐孔の周面との接触圧が高まり、分岐孔からスリーブが抜け出るのを防止するようにしている。
【０００６】
そのため、後者の穿孔方法は、穿孔後における樹脂管の復元力により、スリーブが内側に押されて穿孔刃に密着してしまい、穿孔刃のみを引き上げることが困難であった。また、スリーブの先端が小径であり、しかもスリーブが樹脂管と係止する部分がないことから、穿孔刃にスリーブが密着している場合や、サドルがずれた場合等には、分岐孔からスリーブが抜けてしまうおそれがあった。更には、スリーブの外周が分岐孔の内周に接触した状態で穿孔され、しかも穿孔が進めば進むほど、上述の接触部が増えるので、穿孔トルクが増加して、一層穿孔が困難になる問題も有していた。特に、穿孔後に、穿孔刃の内周を穿孔刃内の切片が樹脂の持つ復元力により広げることになり、一方、追従して分岐孔に圧入されたスリーブは、樹脂管の復元力によりスリーブを内周方向へ狭めようとする。この時、スリーブの内周より穿孔刃の外周が大きくなり、そのため、穿孔刃のみを引き上げるのが極めて困難となっていた。
【０００７】
本発明は、従来の課題点に鑑みて開発したものであり、その目的とするところは、樹脂本管に取付けたサドル分水栓に穿孔作業とこの分水孔にコアを装着する装着作業を同時にかつ円滑に遂行できるようにして作業能率の向上を図ることはもとより、分水栓と分水孔との高精度な密封性を図ることにある。
【０００８】
【課題を解決するための手段】
上記の目的を達成するため、請求項１に係る発明は、樹脂本管に固定し、分水孔穿孔用の穿孔刃を有するサドル分水栓において、前記穿孔刃の穿孔と同時に分水孔に装着する筒状コアを穿孔刃の外周位置に設け、この筒状コアの筒状部分は、分水孔の内周方向への圧力に対応して変形しない程度の肉厚状である厚肉部とし、更に、筒状コアの下端には、穿孔する際に、分水孔の内周を拡径する係止部を設け、この係止部は、分水孔内周を拡径しながら穿孔刃とともに挿入するテーパ部と、分水孔の内側開口縁に係合する段部面より成るサドル分水栓である。
【０００９】
請求項２に係る発明は、樹脂本管に穿孔刃による分水孔の穿孔と同時に、前記分水孔に筒状コアを装着するようにしたサドル分水栓の穿孔方法において、穿孔刃の穿孔に伴って筒状コアの下端に形成した係止部により分水孔を拡径しながら筒状コアを挿入し、この係止部は、分水孔内周を拡径しながら穿孔刃とともに挿入するテーパ部と、分水孔の内側開口縁に係合する段部面よりなり、この係止部を分水孔の内周縁部に係合し或は、その内方側まで挿入して筒状コアを装着するようにしたサドル分水栓の穿孔方法である。
【００１０】
【発明の実施の形態】
以下に、本発明におけるサドル分水栓及びその穿孔方法について、好ましい実施形態を図面に従って説明する。図１〜図３は、樹脂本管の穿孔と筒状コアの装着を同時に行う工程をそれぞれ示した縦断面図である。
【００１１】
図中１は、ポリエチレン樹脂、ポリプロピレン樹脂等の軟質の樹脂本管であり、例えば、水道水等を給水する本管であって、この樹脂本管１の外周面には、本管１の流体通路を分岐するためのサドル分水栓２を固定している。この分水栓２は、樹脂本管１の外周面をバンドとサドル３で囲んで、図示しないボルト・ナットで締付け固定し、サドル３に形成した取付突部４の内周面に樹脂本管１に穿孔する分水孔６を密封シールする環状のガスケット５を装着し、更に、取付突部４のめねじ部４ａに、Ｔ字形状の分水栓本体７のおねじ部７ａを螺合して固着することによりサドル３に分水栓本体７を固定している。
【００１２】
分水栓本体７の分岐部８に継手９を介して分岐管１０を接続し、一方、分水栓本体７の上端には、シール材１１ａを介して挿入孔１１ｂを有するナット１１を螺着している。また、分水栓本体７の下部穴の内周にリング状の顎部１２を設け、分水栓本体７の縦管内周面にめねじ部７ｂを形成している。
【００１３】
１３は、金属、硬質樹脂、セラミック製等の硬質材料から成る筒状コアであり、本例においては、ステンレス製であって、例えば、樹脂本管１の肉厚が１１ｍｍの場合における筒状コア１３の肉厚は０．５ｍｍである。即ち、筒状コア１３の筒状部分は厚肉部１３ａとしており、この厚肉部１３ａは、穿孔時に、コア１３の先端が縮径されるのを防ぎ、穿孔後は、樹脂本管１との密着圧力により、コア１３全体が縮径されるのを防ぐことが可能な程度の肉厚とする。よって、この厚肉部１３ａは、穿孔時にコア先端が縮径されるのを防ぎ、穿孔後は、樹脂本管１との密着圧力により、筒状コア１３の全体が縮径されるのを防ぐ機能を有する。
【００１４】
また、筒状コア１３の上端には、分水栓本体７に設けた顎部１２に係合する環状の鍔部１４を形成し、筒状コア１３の下端には、段部面１５とテーパ面１６を有する係止部１７を設けている。本例における段部面１５の突出寸法ｔ_２は、１ｍｍである。この係止部１７のテーパ面１６により、穿孔時に、分水孔６の内周を円滑に拡径しながら筒状コア１３を挿入し、次いで、係止部１７を分水孔６の内周縁部の内方側まで挿入して筒状コア１３を分水孔６に装着するようにしている。筒状コア１３の下端内径はストレート形状であり、係止部１７のテーパ面１７のテーパ角度は、小さいと穿孔時の抵抗が大きくなり、大きいと係止部１７が大きくなってしまうため、そのテーパ角度は６０°〜７０°が好ましい。また、テーパ面１６の先端１６ａは、穿孔刃１８の外周にコアが嵌合装着された際、穿孔刃１８の刃部１８ａの延長線上に位置するように、構成されている。更に、テーパ面１６の先端１６ａは、尖らせずに平面を形成するようにして先端１６ａに剛性をもたせることにより、樹脂本管１の穿孔の際、コアが穿孔刃側に寄ってしまうのを防止している。
【００１５】
１８は、円筒状の金属製穿孔刃であり、この穿孔刃１８の上部には、拡径した拡径部１９の外周におねじ部１９ａを形成すると共に、拡径部１９の下端外周面１９ｂで、前記の筒状コア１３の鍔部１４上面を押圧しながら筒状コア１３を樹脂本管１に圧入するようにしている。更に、拡径部１９の中央上端に穿孔操作具を取付けて回転駆動させる回転棒２０を係合固定する角形部１９ｃを設けている。また、穿孔刃１８の内周側には、樹脂本管１の穿孔切片１ａを保持するための保持部２１を設けている。
【００１６】
また、穿孔刃１８の外周には、筒状コア１３をＯリング２２を介して軸方向に対して仮固定し、コア１３の係止部１７の下端より刃部１８ａを突出するように、穿孔刃１８の外周に筒状コア１３を嵌合状態に装着している。筒状コア１３は、穿孔刃１８の拡径部１９に設けられている下端外周面１９ｂが筒状コア１３の鍔部１４を押圧しながら、分水孔６内に挿入される。
【００１７】
次に、上記実施形態の作用を説明する。樹脂本管１にサドル分水栓を固定し、次いで、穿孔開始時の状態まで、手動又は自動で回転棒２０を回転操作して穿孔刃１８を螺子込みながら筒状コア１３を下降させて図１に示す状態にする。このとき、回転棒２０の操作トルク値は、図１２のＡの値になる。
【００１８】
次に、図４に示すように、コア挿入開始時において、樹脂本管１には、刃部１８ａの中心径φｄの口径で、分水孔６の穿孔が行われる。穿孔刃１８の挿入につれ、分水孔６は、刃部１８ａの厚さの半分だけ（図４R>４におけるｔ寸法分）更に押し広げられる。なお、穿孔刃１８の刃部１８ａが樹脂本管１の上面に入り込む際の、本実施例における回転棒２０の操作トルク値は、図１２１２において、Ｂの値（約１９．６Ｎ・ｍ）になる。
【００１９】
次に、図５に示すように、コア挿入の始めの時において、筒状コア１３が穿孔刃１８に続いて分水孔６の口径（φｄ＋２ｔ）を更に広げながら進む。すなわち、樹脂本管１の分水孔６は、同図のＴ寸法（刃部１８ａの刃中心から筒状コア１３の外周までの距離ｔ₁＋段部面１５の突出分ｔ_２）の厚さ分、押し広げられる。この時の回転棒２０の操作トルク値は、図１２において、Ｃの値（約３５Ｎ・ｍ）になる。次いで、図６に示すように、穿孔の途中においては、筒状コア１３の係止部１７によって、樹脂本管１が段部面１５の突出分ｔ_２だけ押し広げられていることにより、筒状コア１３と樹脂本管１との接触面積が少なくなるので、回転棒２０の操作トルクは降下し、図１２において、Ｄの値（約２４．５Ｎ・ｍ）になる。なお、穿孔が進むにつれ、段部面１５の突出分ｔ_２だけ押し広げられていた樹脂本管１が押し戻されてくるが、筒状コア１３の外周と樹脂本管１とが直ちに接触をするわけではないので、回転棒２０の操作トルクアップにはならない。
【００２０】
次に、図７に示すように、コア挿入終了時において、筒状コア１３の係止部１７の段部面１５が分水孔６の内周側開口縁に係合される。係止部１７と樹脂本管１との接触抵抗がなくなるので、この時の回転棒２０の操作トルク値は更に減少し、図１２において、Ｅの値（約１９．６Ｎ・ｍ）になる。なお、コア１３の寸法設定により、この状態、すなわち筒状コア１３の係止部１７の段部面１５が分水孔６の内側開口縁に係合した状態において、筒状コア１３の鍔部１４と分水栓本体に設けた顎部１２も係合する場合と、図２に示すように、筒状コア１３の鍔部１４と分水栓本体に設けた顎部１２が係合するまで筒状コア１３の挿入を続けると、係止部１７が分水孔６の内側開口縁を離れて内方側まで挿入される場合とがある。これらは、実施において任意である。図２に示す状態まで更に筒状コアを挿入する場合は、筒状コア１３の外周面と樹脂本管１との接触面積が増えるため、回転棒２０の操作トルクは上昇し、図１２において、Ｆの値（約３９Ｎ・ｍ）になる。
【００２１】上記のように、穿孔中において、穿孔刃１８が回転しながら、筒状コアを下方に押し込むが、このとき、筒状コア１３の係止部１７により、分水孔６が拡径されるので、筒状コア１３と分水孔６の接触圧力が小さくなり、しかも、図１２に示すように、穿孔トルクも小さくて済む。なお、コアに係止部がない場合は、図１２R>２における二点鎖のようなトルク値となるのに対し、本発明による構造は、Ｃ−Ｄ−Ｅの実線に示すようにトルク値が低くなる。この筒状コア１３の係止部１７は、穿孔作業終了後の穿孔刃の引抜きの際や、サドル分水栓に不用意に外力が加わっても、筒状コア１３が分水孔６から抜け出るのを防止する機能を兼用している。
【００２２】
また、穿孔後において、筒状コア１３の外周と分水孔６の内周が密着するが、筒状コア１３は厚肉部１３ａを有しているので、変形するおそれがなく、穿孔刃１８の引き上げが容易となる。更に、サドル分水栓の通水時においては、回転棒２０を取り除いて、穿孔刃１８が分水栓本体７の内部上方に位置させておく。一方、分水栓を再閉止する場合は、穿孔刃１８の上部に取付けた回転棒２０を回転操作して、穿孔刃１８を図２の状態に下降させることにより分水栓の通水を再度閉止することができる。
【００２３】
【発明の効果】
以上のことから明らかなように、本発明によると、筒状コアを肉厚に形成しているので、樹脂本管の分水孔との密着圧により筒状コアが変形して縮径されることがないため、穿孔終了後において、筒状コアから穿孔刃を円滑に引き上げることができる。
【００２４】
また、分水孔の穿孔の際、筒状コアの下端に形成された係止部により分水孔の内径が拡径され、筒状コアの外周と分水孔との接触面積が減るので、軽い穿孔トルクで穿孔作業を行うことができる。更には、穿孔刃の引き上げ時において、筒状コアの係止部が、分水孔の内周縁部に係合されるので、穿孔刃の引き上げに伴って筒状コアが抜け出るおそれはない。また、サドル分水栓に不用意に外力が加わっても、筒状コア外周と分水孔内周が密着しているので、サドル分水栓と樹脂本管との位置関係が変化することなく、サドル分水栓と分水孔との密封性を確実に保持させることができる。
【００２５】
【図面の簡単な説明】
【図１】本発明における樹脂管用サドル分水栓の穿孔開始前の状態を示す一部切欠き縦断面図である。
【図２】図１の状態における穿孔とコアの装着時或は再閉止時を示す縦断面図である。
【図３】図２の状態において、穿孔刃を上方へ引き上げた状態を示す縦断面図である。
【図４】コアの挿入開始時の状態を示す部分拡大断面図である。
【図５】コアの挿入始めの状態を示す部分拡大断面図である。
【図６】コアの挿入途中の状態を示す部分拡大断面図である。
【図７】コアの挿入終了時の状態を示す部分拡大断面図である。
【図８】穿孔刃の平面図である。
【図９】穿孔刃の正面図である。
【図１０】コアの平面図である。
【図１１】コアの正面図である。
【図１２】穿孔と挿入のトルク値を示したグラフである。
【符号の説明】
１樹脂本管
２サドル分水栓
６分水孔
７分水栓本体
１３筒状コア
１３ａ厚肉部
１５段部面
１６テーパ面
１７係止部
１８穿孔刃

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a saddle water faucet for connecting a branch pipe to a resin main pipe applied to upper, middle and sewer pipes or gas pipes in a state of indefinite water and indefinite gas, and a method for perforating the saddle water faucet.
[0002]
[Prior art]
Normally, when branching a water main or gas main, a saddle water faucet is fixed to the water main, etc., and a branch pipe is connected to the water faucet for branching. A gasket is mounted between the perforated hole and the saddle mounting surface so as to achieve a sealing property between the water faucet and the perforated hole. If the main pipe is a metal pipe such as a cast iron pipe or a steel pipe, the sealing performance of the saddle mounting surface is maintained by the gasket. However, when the main pipe is a resin pipe such as polyethylene, polypropylene, etc., if the saddle is tightened with bolts and nuts for a long time, the pipe will creep due to the residual stress of the resin pipe, etc. When the performance deteriorates or the saddle receives a large external force due to an earthquake or the like, the resin pipe is displaced, so that a fluid such as water leaks from this portion. In order to solve these disadvantages, countermeasures described in JP-A-10-196871, JP-A-11-2380 and the like have been proposed.
[0003]
Of these, Japanese Patent Laid-Open No. 10-196871 discloses that a saddle water faucet is attached to a resin pipe via a gasket, and further, a branch hole is formed by a punching tool at a position where the resin pipe is attached, and then inserted into the branch hole. The core is screwed in. Japanese Patent Application Laid-Open No. 11-2380 is a branching method in which a saddle branch plug is attached to a resin pipe, and then a sleeve for preventing the resin pipe and the saddle from being displaced at the same time as drilling into the resin pipe is inserted into the branch hole. is there.
[0004]
[Problems to be solved by the invention]
However, the former publication requires a drilling operation with a drilling tool in order to drill a branch hole in the resin pipe in the first stage, and then, as a second stage, a process of mounting an insert core in the branch hole with a core mounting tool. Needed. For this reason, the work of joining the branch pipe to the resin pipe and branching it becomes complicated, which is not good in terms of work efficiency.
[0005]
According to the latter publication, a drilling blade for drilling a resin tube has a reduced diameter portion for holding a section of the resin tube that has been hollowed out along with the drilling of the branch hole. The inner diameter of the branch hole formed by the blade tip is smaller than the outer diameter of the sleeve having a small diameter along the tip of the drilling blade. The contact pressure is increased to prevent the sleeve from coming out of the branch hole.
[0006]
Therefore, in the latter drilling method, due to the restoring force of the resin tube after drilling, the sleeve is pushed inward and is in close contact with the drilling blade, and it is difficult to pull up only the drilling blade. Also, since the tip of the sleeve has a small diameter and there is no portion where the sleeve engages with the resin tube, when the sleeve is in close contact with the drilling blade or when the saddle is displaced, the sleeve extends from the branch hole. Could fall out. Furthermore, the hole is drilled in a state where the outer periphery of the sleeve is in contact with the inner periphery of the branch hole, and as the drilling progresses, the contact portion increases, so that the drilling torque increases and the drilling becomes more difficult. Also had. In particular, after drilling, the inner periphery of the drilling blade is expanded by the restoring force of the resin in the section of the drilling blade. Try to narrow toward the inner circumference. At this time, the outer periphery of the drilling blade is larger than the inner periphery of the sleeve, so that it is extremely difficult to pull up only the drilling blade.
[0007]
The present invention has been developed in view of the conventional problems, and the object of the present invention is to perform a drilling operation on a saddle water faucet attached to a resin main pipe and a mounting operation of mounting a core on the water distribution hole. In addition to improving work efficiency by enabling simultaneous and smooth execution, the aim is to achieve highly accurate sealing between the water faucet and the water distribution hole.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a saddle water faucet fixed to a resin main pipe and having a perforating blade for perforating water holes. A cylindrical core to be mounted is provided at the outer peripheral position of the drilling blade, and the cylindrical portion of the cylindrical core is a thick portion that does not deform corresponding to the pressure in the inner peripheral direction of the water diversion hole In addition, the lower end of the cylindrical core is provided with a locking portion that expands the inner periphery of the water dividing hole when drilling, and this locking portion is drilled while expanding the inner periphery of the water dividing hole. A saddle water faucet comprising a tapered portion inserted together with a blade and a stepped surface that engages with an inner opening edge of a water distribution hole.
[0009]
According to a second aspect of the present invention, there is provided a method for drilling a saddle water faucet in which a cylindrical core is attached to the water splitting hole simultaneously with the drilling of a water splitting hole by a drilling blade in a resin main pipe. Along with this, the cylindrical core is inserted while expanding the water splitting hole by the locking part formed at the lower end of the cylindrical core, and this locking part is inserted together with the drilling blade while expanding the inner diameter of the water splitting hole. A tapered portion and a stepped surface that engages with the inner opening edge of the water diverting hole. The engaging portion engages with the inner peripheral edge of the water diverting hole, or is inserted to the inner side of the cylindrical portion. Is a method of drilling a saddle water faucet with a cylindrical core.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a saddle water faucet and a drilling method thereof according to the present invention will be described with reference to the drawings. 1 to 3 are longitudinal sectional views respectively showing processes for simultaneously drilling a resin main pipe and mounting a cylindrical core.
[0011]
In the figure, reference numeral 1 denotes a soft resin main pipe such as polyethylene resin or polypropylene resin. For example, a main pipe for supplying tap water or the like. A saddle faucet 2 for branching the passage is fixed. The water faucet 2 is formed by surrounding the outer peripheral surface of the resin main pipe 1 with a band and a saddle 3 and tightening and fixing them with bolts and nuts (not shown). The main pipe is attached to the inner peripheral surface of the mounting projection 4 formed on the saddle 3. 1 is fitted with an annular gasket 5 for hermetically sealing the water-dividing hole 6 pierced in 1, and the threaded portion 7 a of the T-shaped water faucet body 7 is screwed onto the female threaded portion 4 a of the mounting projection 4. Thus, the water faucet body 7 is fixed to the saddle 3 by being fixed.
[0012]
A branch pipe 10 is connected to the branching portion 8 of the water faucet body 7 via a joint 9, while a nut 11 having an insertion hole 11 b is screwed to the upper end of the water faucet body 7 via a sealing material 11 a. is doing. A ring-shaped jaw 12 is provided on the inner periphery of the lower hole of the water faucet body 7, and a female thread 7 b is formed on the inner peripheral surface of the vertical pipe of the water faucet body 7.
[0013]
Reference numeral 13 denotes a cylindrical core made of a hard material such as metal, hard resin, or ceramic. In this example, the cylindrical core is made of stainless steel. For example, the cylindrical core when the thickness of the resin main pipe 1 is 11 mm. The wall thickness of 13 is 0.5 mm. That is, the cylindrical portion of the cylindrical core 13 is a thick portion 13a, and this thick portion 13a prevents the tip of the core 13 from being reduced in diameter when drilling. The thickness of the core 13 is such that the entire core 13 can be prevented from being reduced in diameter. Therefore, this thick portion 13a prevents the core tip from being reduced in diameter during drilling, and prevents the entire cylindrical core 13 from being reduced in diameter by the pressure of contact with the resin main pipe 1 after drilling. It has a function.
[0014]
Further, an annular flange 14 is formed on the upper end of the cylindrical core 13 to engage with the jaw 12 provided on the water faucet body 7, and a stepped surface 15 and a taper are formed on the lower end of the cylindrical core 13. A locking portion 17 having a surface 16 is provided. Projecting dimension _{t 2} of the stepped portion surface 15 in this example is 1 mm. Due to the tapered surface 16 of the locking portion 17, the cylindrical core 13 is inserted while smoothly expanding the inner periphery of the water dividing hole 6 during drilling, and then the locking portion 17 is connected to the inner peripheral edge of the water dividing hole 6. The cylindrical core 13 is inserted into the water dividing hole 6 by being inserted to the inner side of the part. The inner diameter of the lower end of the cylindrical core 13 is a straight shape, and if the taper angle of the tapered surface 17 of the locking part 17 is small, the resistance at the time of drilling increases, and if it is large, the locking part 17 becomes large. The taper angle is preferably 60 ° to 70 °. Further, the tip 16a of the tapered surface 16 is configured to be positioned on an extension line of the blade portion 18a of the drilling blade 18 when the core is fitted and mounted on the outer periphery of the drilling blade 18. Furthermore, the tip 16a of the taper surface 16 forms a flat surface without being sharpened so that the tip 16a has rigidity, so that when the resin main pipe 1 is drilled, the core approaches the drilling blade side. It is preventing.
[0015]
Reference numeral 18 denotes a cylindrical metal drilling blade. A screw portion 19 a is formed on the outer periphery of the enlarged diameter portion 19 on the upper portion of the drilling blade 18, and a lower end outer peripheral surface 19 b of the enlarged diameter portion 19. Thus, the cylindrical core 13 is press-fitted into the resin main pipe 1 while pressing the upper surface of the flange portion 14 of the cylindrical core 13. Further, a square portion 19c for engaging and fixing a rotating rod 20 that is attached to the center upper end of the enlarged diameter portion 19 and is driven to rotate is provided. Further, on the inner peripheral side of the punching blade 18, a holding portion 21 for holding the punched piece 1 a of the resin main pipe 1 is provided.
[0016]
Further, on the outer periphery of the drilling blade 18, the cylindrical core 13 is temporarily fixed with respect to the axial direction via the O-ring 22, and the drilling portion 18 a protrudes from the lower end of the locking portion 17 of the core 13. The cylindrical core 13 is mounted on the outer periphery of the blade 18 in a fitted state. The cylindrical core 13 is inserted into the water diversion hole 6 while the lower end outer peripheral surface 19 b provided on the enlarged diameter portion 19 of the drilling blade 18 presses the flange portion 14 of the cylindrical core 13.
[0017]
Next, the operation of the above embodiment will be described. The saddle water faucet is fixed to the resin main pipe 1, and then the cylindrical core 13 is lowered while screwing the drilling blade 18 by rotating the rotating rod 20 manually or automatically until the drilling is started. 1 is set. At this time, the operation torque value of the rotating rod 20 becomes the value A in FIG.
[0018]
Next, as shown in FIG. 4, at the start of core insertion, water splitting holes 6 are drilled in the resin main pipe 1 with the diameter of the center diameter φd of the blade portion 18a. As the piercing blade 18 is inserted, the water diversion hole 6 is further expanded by half the thickness of the blade portion 18a (the t dimension in FIG. 4R> 4). The operating torque value of the rotating rod 20 in this embodiment when the blade portion 18a of the drilling blade 18 enters the upper surface of the resin main pipe 1 is the value B (about 19.6 N · m) in FIG. Become.
[0019]
Next, as shown in FIG. 5, at the beginning of core insertion, the cylindrical core 13 advances following the drilling blade 18 while further expanding the diameter (φd + 2t) of the water diversion hole 6. That is, the water diversion hole 6 of the resin main pipe 1 has a thickness of T dimension (distance t ₁ from the blade center of the blade portion 18a to the outer periphery of the cylindrical core 13 + protruding portion t ₂ of the step portion surface 15). It will be pushed out for a while. The operating torque value of the rotating rod 20 at this time is the value of C (about 35 N · m) in FIG. Next, as shown in FIG. 6, in the middle of drilling, the resin main pipe 1 is pushed and expanded by the protrusion t ₂ of the stepped surface 15 by the locking portion 17 of the cylindrical core 13. Since the contact area between the cylindrical core 13 and the resin main pipe 1 is reduced, the operating torque of the rotating rod 20 drops and becomes the value D (about 24.5 N · m) in FIG. Incidentally, as the drilling progresses, the projecting amount t ₂ only press resin main 1 has been widened in the step portion surface 15 comes pushed back, and the outer resin main 1 of the tubular core 13 is immediately contact However, the operation torque of the rotating rod 20 is not increased.
[0020]
Next, as shown in FIG. 7, at the end of core insertion, the stepped surface 15 of the locking portion 17 of the cylindrical core 13 is engaged with the inner peripheral side opening edge of the water dividing hole 6. Since the contact resistance between the locking portion 17 and the resin main pipe 1 is eliminated, the operating torque value of the rotating rod 20 at this time further decreases, and becomes the value E (about 19.6 N · m) in FIG. In this state, that is, in a state in which the stepped surface 15 of the locking portion 17 of the cylindrical core 13 is engaged with the inner opening edge of the water dividing hole 6 by the dimension setting of the core 13, the flange portion of the cylindrical core 13 14 and the jaw 12 provided on the water faucet body are also engaged, and until the collar portion 14 of the cylindrical core 13 and the jaw 12 provided on the water faucet body are engaged, as shown in FIG. If the insertion of the cylindrical core 13 is continued, the locking portion 17 may be inserted from the inner opening edge of the water diversion hole 6 to the inner side. These are optional in the implementation. When the cylindrical core is further inserted to the state shown in FIG. 2, the contact area between the outer peripheral surface of the cylindrical core 13 and the resin main pipe 1 is increased, so that the operating torque of the rotating rod 20 is increased. The value of F is about 39 N · m.
As described above, during drilling, the cylindrical core is pushed downward while the drilling blade 18 rotates. At this time, the water diversion hole 6 is expanded by the engaging portion 17 of the cylindrical core 13. Therefore, the contact pressure between the cylindrical core 13 and the water dividing hole 6 is reduced, and the drilling torque can be reduced as shown in FIG. When the core does not have a locking portion, the torque value is as shown by a two-dot chain in FIG. 12R> 2, whereas the structure according to the present invention has a torque value as indicated by the solid line C-D-E. Becomes lower. The locking portion 17 of the cylindrical core 13 is pulled out from the water diverting hole 6 when the drilling blade is pulled out after the drilling operation is completed or when an external force is applied to the saddle water faucet carelessly. It also has a function to prevent this.
[0022]
Further, after drilling, the outer periphery of the cylindrical core 13 and the inner periphery of the water diversion hole 6 are in close contact with each other. However, since the cylindrical core 13 has the thick portion 13a, there is no possibility of deformation, and the drilling blade 18 Can be easily lifted. Further, when the saddle water faucet is passed through, the rotary rod 20 is removed and the perforating blade 18 is positioned above the water faucet body 7. On the other hand, when reclosing the water faucet, the rotary rod 20 attached to the upper portion of the perforating blade 18 is rotated to lower the perforating blade 18 to the state shown in FIG. Can be closed.
[0023]
【The invention's effect】
As is clear from the above, according to the present invention, since the cylindrical core is formed thick, the cylindrical core is deformed and reduced in diameter by the contact pressure with the water diversion hole of the resin main pipe. Therefore, the drilling blade can be smoothly pulled up from the cylindrical core after completion of drilling.
[0024]
In addition, when the water split hole is drilled, the inner diameter of the water split hole is increased by the locking portion formed at the lower end of the cylindrical core, and the contact area between the outer periphery of the cylindrical core and the water split hole is reduced. Drilling can be performed with light drilling torque. Furthermore, when the drilling blade is pulled up, the locking portion of the cylindrical core is engaged with the inner peripheral edge of the water diversion hole, so that there is no possibility that the cylindrical core will come out when the drilling blade is pulled up. Even if an external force is applied to the saddle water faucet carelessly, the outer periphery of the cylindrical core and the inner periphery of the water distribution hole are in close contact with each other, so that the positional relationship between the saddle water faucet and the resin main pipe does not change. Further, it is possible to reliably maintain the sealing performance between the saddle water faucet and the water distribution hole.
[0025]
[Brief description of the drawings]
FIG. 1 is a partially cutaway longitudinal sectional view showing a state before starting drilling of a saddle water faucet for a resin pipe according to the present invention.
2 is a longitudinal sectional view showing a state in which the perforation and core are mounted or reclosed in the state shown in FIG. 1;
3 is a longitudinal sectional view showing a state in which the drilling blade is pulled upward in the state of FIG. 2;
FIG. 4 is a partially enlarged cross-sectional view showing a state at the start of core insertion.
FIG. 5 is a partially enlarged cross-sectional view showing a state where a core is first inserted.
FIG. 6 is a partially enlarged sectional view showing a state in the middle of core insertion.
FIG. 7 is a partially enlarged cross-sectional view showing a state at the end of core insertion.
FIG. 8 is a plan view of a drilling blade.
FIG. 9 is a front view of a drilling blade.
FIG. 10 is a plan view of a core.
FIG. 11 is a front view of a core.
FIG. 12 is a graph showing torque values for drilling and insertion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin main pipe 2 Saddle water tap 6 Water split hole 7 Water tap main body 13 Cylindrical core 13a Thick part 15 Step part surface 16 Tapered surface 17 Locking part 18 Perforation blade

Claims

In a saddle water faucet fixed to a resin main pipe and having a perforating blade for perforating a water splitting hole, a cylindrical core that is attached to the water splitting hole simultaneously with the perforation of the perforating blade is provided at the outer peripheral position of the perforating blade The cylindrical part of the cylindrical core is a thick part that is thick enough not to deform in response to the pressure in the inner circumferential direction of the water diversion hole, and further, the lower end of the cylindrical core is A locking portion for expanding the inner periphery of the water diversion hole is provided , and the locking portion is formed on the inner opening edge of the water diversion hole and a tapered portion that is inserted together with the drilling blade while expanding the inner periphery of the water diversion hole. A saddle water faucet comprising an engaging stepped surface.

In the method for drilling a saddle water faucet in which a cylindrical core is attached to the water splitting hole at the same time as the water splitting hole is drilled in the resin main pipe, the lower end of the cylindrical core is The cylindrical core is inserted while the water splitting hole is enlarged by the locking part formed on the inner side, and the locking part is inserted with the drilling blade while expanding the inner diameter of the water splitting hole, and the water splitting hole It is composed of a stepped surface that engages with the inner opening edge of this, and this locking portion is engaged with the inner peripheral edge of the water diverting hole or inserted to the inner side to mount the cylindrical core. A method for drilling a saddle faucet characterized by the above.