JP3187984U

JP3187984U - Cutting edge thread

Info

Publication number: JP3187984U
Application number: JP2013006064U
Authority: JP
Inventors: 康弘大場
Original assignee: 株式会社コクブ
Filing date: 2013-10-03
Publication date: 2013-12-26
Anticipated expiration: 2020-10-05

Abstract

【課題】ねじ込みの精度を良好に維持しつつ、頭部の天面に汚れや水が溜まらず、頭部の腐食を防止できる切り刃先ねじを提供する。
【解決手段】切り刃先ねじ１の頭部３０の天面３１の形状は、凹みがなくて、膨らんでいる。このため、頭部３０の天面３１には、埃等の汚れや雨水等の水が溜まらない。また、切り刃先ねじ１の鍔部２０の裏面２１は、環状の溝部を有する。このため、頭部３０の外形を高精度に成形できる。軸部１０の外周面には、第１のねじ山１１および第２のねじ山１２が設けられている。第１のねじ山１１の呼び径は、第２のねじ山１２の呼び径よりも大きい。第１のねじ山１１と第２のねじ山１２とは、ダブルリードねじとして、軸方向に交互に並んで設けられている。
【選択図】図１There is provided a cutting edge screw capable of preventing the head from corroding without maintaining dirt and water on the top surface of the head while maintaining good screwing accuracy.
A top surface 31 of a head 30 of a cutting blade tip screw 1 has no dent and swells. For this reason, dirt such as dust and water such as rainwater do not collect on the top surface 31 of the head 30. Moreover, the back surface 21 of the flange portion 20 of the cutting blade tip screw 1 has an annular groove portion. For this reason, the external shape of the head 30 can be shape | molded with high precision. A first thread 11 and a second thread 12 are provided on the outer peripheral surface of the shaft portion 10. The nominal diameter of the first thread 11 is larger than the nominal diameter of the second thread 12. The first screw threads 11 and the second screw threads 12 are provided alternately in the axial direction as double lead screws.
[Selection] Figure 1

Description

この考案は、例えば、ソーラーパネルの架台、板金金具、支持金具等の屋外用の役物を、屋根材、外壁材等の被取付材に取り付けることに使用される切り刃先ねじに関する。 The present invention relates to a cutting edge screw used to attach an outdoor accessory such as a solar panel base, a sheet metal fitting, and a support fitting to a material to be attached such as a roofing material or an outer wall material.

従来より、締結部材としては、ボルトと切り刃先ねじとが良く知られている。ボルトの六角頭部の外周面は、金型で拘束されて形成されるため、比較的精度が低いが、ボルトは、ねじ穴に案内されてねじ込まれるため、六角頭部と工具との嵌合に多少のがたつきがあっても問題がない。 Conventionally, bolts and cutting edge screws are well known as fastening members. The outer peripheral surface of the hexagon head of the bolt is formed by being constrained by a mold, so the accuracy is relatively low. However, the bolt is screwed by being guided by the screw hole, so the hexagon head fits with the tool. There is no problem even if there is some shakiness.

一方、切り刃先ねじは、切刃で穴を開けながら、ねじを切りつつねじ込むため、切刃が穴を開ける方向からブレないように、頭部に設けた凹部と工具の先端とを密に嵌合するようにしなければならない。 On the other hand, the cutting edge screw is screwed in while cutting the screw while making a hole with the cutting blade, so the recess provided in the head and the tip of the tool are closely fitted so that the cutting blade does not shake from the direction of drilling the hole. You have to make sure.

従来、この種の切り刃先ねじとしては、ねじ山を有する軸部の先端に切刃を設ける一方、上記軸部の他端の頭部に、精度の高い十字溝を設けて、この十字溝と工具とを密に嵌合して、切刃の穴開け方向がブレ無いようにしている（特開２００３−４２１２１号公報：特許文献１参照）。 Conventionally, as this type of cutting edge screw, a cutting blade is provided at the tip of a shaft portion having a thread, and a high-precision cross groove is provided at the head of the other end of the shaft portion. The tool is closely fitted so that the direction of drilling the cutting blade does not fluctuate (see Japanese Patent Laid-Open No. 2003-42121: Patent Document 1).

しかしながら、上記従来の切り刃先ねじでは、ソーラーパネルの架台のように屋外で使用すると、頭部の天面に十字穴を設けているため、この十字穴に雨水や塵埃がたまって、錆等の腐食が生じると言う問題がある。 However, the above conventional cutting edge screw has a cross hole on the top of the head when used outdoors like a solar panel mount, so rainwater and dust accumulate in the cross hole, causing rust, etc. There is a problem that corrosion occurs.

特開２００３−４２１２１号公報JP 2003-42121 A

そこで、この考案の課題は、ねじ込みの精度を良好に維持しつつ、頭部の天面に汚れや水が溜まらず、頭部の腐食を防止できる切り刃先ねじを提供することにある。 Therefore, an object of the present invention is to provide a cutting edge screw that can prevent the head from corroding while keeping the accuracy of screwing in a good state and preventing dirt and water from accumulating on the top surface of the head.

上記課題を解決するため、この考案の切り刃先ねじは、
外周面にねじ山が設けられている軸部と、
この軸部の一端側に位置する頭部と、
上記軸部の一端と上記頭部との間に位置する鍔部と、
上記軸部の他端に位置する切刃と、
上記軸部に貫通されて上記鍔部の上記軸部側の一面に位置する環状のシール部材とを備え、上記頭部の上記軸部と反対側の一面の形状は、凹みがなくて、平坦または膨らんでおり、上記鍔部の上記軸部側の上記一面は、上記軸部の外側に位置する座面部と、この座面部の外側に位置する環状の溝部と、この溝部の外側に位置する環状のリブ部とを有し、
上記シール部材は、上記座面部に接触すると共に、上記シール部材の少なくとも一部が、上記溝部に入り込むことを特徴としている。In order to solve the above problem, the cutting edge screw of this device is
A shaft portion provided with a thread on the outer peripheral surface;
A head located on one end side of the shaft,
A collar portion located between one end of the shaft portion and the head portion;
A cutting blade located at the other end of the shaft,
An annular seal member that is penetrated by the shaft portion and located on one surface of the flange portion on the shaft portion side, and the shape of the one surface on the opposite side of the shaft portion of the head portion is flat and flat. Alternatively, the one surface on the shaft portion side of the flange portion is swelled, a seat surface portion located outside the shaft portion, an annular groove portion located outside the seat surface portion, and located outside the groove portion. An annular rib portion,
The seal member is in contact with the seat surface portion, and at least a part of the seal member enters the groove portion.

ここで、切り刃先ねじとは、被取付材や役物に下穴加工を必要とせずに、切刃で穴を開けながらねじ山でねじ穴を切りつつねじ込んでいくねじをいう。 Here, the cutting blade tip screw refers to a screw that is screwed while cutting a screw hole with a screw thread while making a hole with a cutting blade, without requiring a prepared hole processing on a material to be attached or an accessory.

この考案の切り刃先ねじによれば、上記頭部の上記一面の形状は、凹みがなくて、平坦または膨らんでいるので、頭部の一面には、埃等の汚れや雨水等の水が溜まらない。このため、頭部の腐食を防止できる。 According to the cutting edge screw of the present invention, the shape of the one surface of the head is flat or swollen without a dent, so that dirt such as dust and water such as rainwater collect on one surface of the head. Absent. For this reason, corrosion of the head can be prevented.

また、上記鍔部の上記一面は、環状の溝部を有するので、頭部を金型で拘束して成型するとき、鍔部の一面に溝部を形成するように鍔部の一面を押し込むことで、押し込まれた部分の体積（材料）が頭部に流れ込んで、頭部の外形（輪郭）を高精度に成形できる。このように、頭部の外形の精度が良好であるので、工具により頭部を嵌合して保持しながら切り刃先ねじを被取付材や役物にねじ込むとき、工具と頭部との間のがたつきがなくて、切り刃先ねじのねじ込みの精度を良好に維持できる。In addition, since the one surface of the collar portion has an annular groove portion, when the head portion is constrained by a mold, by pressing one surface of the collar portion so as to form a groove portion on one surface of the collar portion, The volume (material) of the pushed-in portion flows into the head, and the outer shape (contour) of the head can be formed with high accuracy. As described above, since the accuracy of the outer shape of the head is good, when the cutting edge screw is screwed into the attachment material or the accessory while the head is fitted and held by the tool, it is between the tool and the head. There is no rattling, and the screwing accuracy of the cutting edge screw can be maintained well.

また、上記鍔部の上記一面は、上記座面部と上記溝部と上記リブ部とを有し、上記シール部材は、上記座面部に接触すると共に、上記シール部材の少なくとも一部が、上記溝部に入り込むので、切り刃先ねじを被取付材や役物にねじ込んだとき、シール部材は、被取付材および役物と鍔部との間に挟持されつつ、座面部、溝部およびリブ部の凹凸構造に、挟み込まれる。このため、鍔部に対するシール部材の動きを抑制でき、止水性が向上する。 Further, the one surface of the flange has the seat surface portion, the groove portion, and the rib portion, and the seal member contacts the seat surface portion, and at least a part of the seal member is in the groove portion. Therefore, when the cutting edge screw is screwed into the material to be attached or an accessory, the sealing member is sandwiched between the object to be attached and the accessory and the collar part, and the uneven structure of the seat surface part, groove part and rib part is obtained. , Get caught. For this reason, the movement of the sealing member with respect to the collar portion can be suppressed, and the water stoppage is improved.

また、上記軸部の他端には、切刃が設けられているので、切り刃先ねじを被取付材や役物にねじ込むとき、切刃により被取付材や役物を先行して切り込むことができ、切り刃先ねじをスムーズにねじ込むことができる。 Further, since the other end of the shaft portion is provided with a cutting blade, when the cutting blade tip screw is screwed into the attached material or accessory, the attached material or accessory can be cut in advance by the cutting blade. The cutting edge screw can be screwed in smoothly.

この考案の切り刃先ねじによれば、上記頭部の上記一面の形状は、凹みがなくて、平坦または膨らんでいるので、頭部の一面には、埃等の汚れや雨水等の水が溜まらず、頭部の腐食を防止できる。また、上記鍔部の上記一面は、環状の溝部を有するので、切り刃先ねじのねじ込みの精度を良好に維持できる。 According to the cutting edge screw of the present invention, the shape of the one surface of the head is flat or swollen without a dent, so that dirt such as dust and water such as rainwater collect on one surface of the head. Therefore, corrosion of the head can be prevented. Moreover, since the said one surface of the said collar part has a cyclic | annular groove part, the precision of the screwing of a cutting blade tip screw can be maintained favorable.

本考案の切り刃先ねじの一実施形態を示す斜視図である。It is a perspective view showing one embodiment of a cutting blade tip screw of the present invention. 頭部の天面側からみた切り刃先ねじの斜視図である。It is a perspective view of the cutting blade tip screw seen from the top surface side of the head. 鍔部の裏面側からみた切り刃先ねじの斜視図である。It is a perspective view of the cutting blade tip screw seen from the back surface side of a collar part.

以下、この考案を図示の実施の形態により詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

図１は、この考案の切り刃先ねじの一実施形態である斜視図を示している。ここで、切り刃先ねじとは、被取付材や役物に下穴加工を必要とせずに、切刃で穴を開けながらねじ山でねじ穴を切りつつねじ込んでいくねじをいう。 FIG. 1: has shown the perspective view which is one Embodiment of the cutting blade tip screw of this invention. Here, the cutting blade tip screw refers to a screw that is screwed while cutting a screw hole with a screw thread while making a hole with a cutting blade, without requiring a prepared hole processing on a material to be attached or an accessory.

図１に示すように、上記切り刃先ねじ１は、例えば、ソーラーパネルの架台、板金金具、支持金具等の屋外用の役物を、屋根材、外壁材等の被取付材に取り付けることに使用される。この被取付材としては、例えば木質材や薄鉄板等から構成される。 As shown in FIG. 1, the cutting blade tip screw 1 is used, for example, to attach an outdoor accessory such as a solar panel base, a sheet metal fitting, and a support fitting to a material to be attached such as a roofing material or an outer wall material. Is done. As this to-be-attached material, it is comprised from a wood material, a thin iron plate, etc., for example.

上記切り刃先ねじ１は、軸部１０と、この軸部１０の一端側に位置する頭部３０と、軸部１０の一端と頭部３０との間に位置する鍔部２０と、軸部１０の他端に位置する切刃１３と、鍔部２０の軸部１０側の一面（裏面）２１に位置するシール部材４０とを有する。 The cutting edge screw 1 includes a shaft portion 10, a head portion 30 positioned on one end side of the shaft portion 10, a flange portion 20 positioned between one end of the shaft portion 10 and the head portion 30, and the shaft portion 10. And the sealing member 40 located on one surface (back surface) 21 on the shaft portion 10 side of the flange portion 20.

上記軸部１０、上記頭部３０、上記鍔部２０および上記切刃１３は、例えばステンレスにより、一体に構成されている。上記シール部材４０は、例えば樹脂やゴムにより構成されている。 The shaft portion 10, the head portion 30, the flange portion 20, and the cutting blade 13 are integrally formed of, for example, stainless steel. The seal member 40 is made of, for example, resin or rubber.

上記軸部１０の外周面には、第１のねじ山１１および第２のねじ山１２が設けられている。第１のねじ山１１の呼び径は、第２のねじ山１２の呼び径よりも大きい。第１のねじ山１１と第２のねじ山１２とは、ダブルリードねじとして、軸方向に交互に並んで設けられている。A first thread 11 and a second thread 12 are provided on the outer peripheral surface of the shaft portion 10. The nominal diameter of the first thread 11 is larger than the nominal diameter of the second thread 12. The first screw threads 11 and the second screw threads 12 are provided alternately in the axial direction as double lead screws.

上記切刃１３は、いわゆるスプーン刃であり、平面視略Ｖ字状に形成され、円錐を高さ方向に沿って半分に切断したような形状である。切り刃先ねじ１の被取付材や役物へのねじ込みの際に、切刃１３の被取付材や役物に対する食い付きが良好となる。 The said cutting blade 13 is what is called a spoon blade, is formed in planar view substantially V shape, and is a shape which cut | disconnected the cone in half along the height direction. When the cutting blade tip screw 1 is screwed into the attached material or accessory, the biting of the cutting blade 13 against the attached material or accessory becomes good.

図２に示すように、上記頭部３０の外形（輪郭）は、六角形である。頭部３０の軸部１０と反対側の一面（天面）３１の形状は、（十字穴や四角穴等の）凹みがなくて、膨らんでいる。つまり、頭部３０の一面３１には、平面視円形の膨出部３２が設けられている。 As shown in FIG. 2, the outer shape (contour) of the head 30 is a hexagon. The shape of one surface (top surface) 31 on the opposite side of the shaft portion 10 of the head 30 is swollen without a dent (such as a cross hole or a square hole). That is, a bulging portion 32 having a circular shape in plan view is provided on one surface 31 of the head 30.

上記鍔部２０の外形（輪郭）は、円形であり、この鍔部２０の径は、頭部３０の径よりも、大きい。図３に示すように、鍔部２０の上記一面２１は、軸部１０の外側に位置する座面部２５と、この座面部２５の外側に位置する環状の溝部２６と、この溝部２６の外側に位置する環状のリブ部２７とを有する。座面部２５とリブ部２７とは、同一の高さに位置する。なお、図３では、分かりやすくするために、シール部材４０を一部省略して描いている。 The outer shape (contour) of the flange 20 is circular, and the diameter of the flange 20 is larger than the diameter of the head 30. As shown in FIG. 3, the one surface 21 of the flange portion 20 is formed on a seat surface portion 25 located outside the shaft portion 10, an annular groove portion 26 located outside the seat surface portion 25, and outside the groove portion 26. And an annular rib portion 27 which is positioned. The seat surface portion 25 and the rib portion 27 are located at the same height. In FIG. 3, the seal member 40 is partially omitted for easy understanding.

上記シール部材４０は、環状であり、軸部１０に貫通されている。シール部材４０の外周面は、鍔部２０のリブ部２７の径方向内側に位置する。つまり、シール部材４０の軸方向端面は、鍔部２０の座面部２５および溝部２６に対向する。シール部材４０は、座面部２５に接触すると共に溝部２６に入り込む。 The seal member 40 is annular and penetrates the shaft portion 10. The outer peripheral surface of the seal member 40 is located on the radially inner side of the rib portion 27 of the flange portion 20. That is, the axial end surface of the seal member 40 faces the seat surface portion 25 and the groove portion 26 of the flange portion 20. The seal member 40 contacts the seat surface portion 25 and enters the groove portion 26.

次に、上記切り刃先ねじ１を上記被取付材や役物にねじ込む状態を説明すると、電動回転工具等の工具により切り刃先ねじ１の頭部３０を嵌合して保持しながら切り刃先ねじ１に回転力を付与して、切り刃先ねじ１を被取付材や役物にねじ込んでいく。この工具の頭部３０を嵌合して保持する部分の形状は、例えば、袋ナット状に形成されている。 Next, a state in which the cutting blade tip screw 1 is screwed into the attached material or accessory will be described. The cutting blade tip screw 1 while fitting and holding the head 30 of the cutting blade tip screw 1 with a tool such as an electric rotary tool. The cutting blade tip screw 1 is screwed into the material to be attached or the accessory by applying a rotational force. The shape of the part which fits and holds the head 30 of the tool is formed in a cap nut shape, for example.

すると、切り刃先ねじ１の切刃１３が、先行して被取付材や役物に穴を開けながら、被取付材や役物の内部に進入していく。第１のねじ山１１と第２のねじ山１２とは、交互に、切刃１３によって開けられた穴の内面に雌ねじを形成しながら進入していく。 Then, the cutting blade 13 of the cutting blade tip screw 1 enters the inside of the attached material or the accessory while previously making a hole in the attached material or the accessory. The first screw thread 11 and the second screw thread 12 alternately enter the inner surface of the hole opened by the cutting blade 13 while forming a female screw.

このように、切刃１３により被取付材や役物を先行して切り込むことで、切り刃先ねじ１を被取付材や役物にスムーズにねじ込んでいく。なお、切刃１３の切削によって生じた切削くずは、第１のねじ山１１と第２のねじ山１２との間の隙間を通って、穴の外側へ排出される。 In this way, the cutting blade 13 is smoothly screwed into the attachment material or the accessory by cutting the attachment material or the accessory in advance with the cutting blade 13. Note that cutting waste generated by cutting the cutting edge 13 passes through the gap between the first screw thread 11 and the second screw thread 12 and is discharged to the outside of the hole.

次に、上記切り刃先ねじ１を上記被取付材や役物にねじ込んで取り付けた状態を説明すると、上記シール部材４０は、被取付材および役物と切り刃先ねじ１の鍔部２０との間に挟持されている。このとき、シール部材４０は、鍔部２０の上記一面２１の上記座面部２５に接触すると共に、シール部材４０の少なくとも一部が、鍔部２０の上記一面２１の上記溝部２６に入り込む。つまり、シール部材４０は、上記座面部２５、上記溝部２６および上記リブ部２７で構成される凹凸構造に、挟み込まれる。このため、鍔部２０に対するシール部材４０の動きを抑制でき、止水性が向上する。 Next, a state where the cutting blade tip screw 1 is screwed into and attached to the attached material or accessory will be described. The seal member 40 is located between the attached material and the accessory and the flange portion 20 of the cutting edge screw 1. Is sandwiched between. At this time, the seal member 40 contacts the seat surface portion 25 of the one surface 21 of the flange portion 20, and at least a part of the seal member 40 enters the groove portion 26 of the one surface 21 of the flange portion 20. That is, the seal member 40 is sandwiched between the concavo-convex structure constituted by the seat surface portion 25, the groove portion 26 and the rib portion 27. For this reason, the movement of the sealing member 40 with respect to the collar part 20 can be suppressed, and water-stopping is improved.

また、切り刃先ねじ１の頭部３０の上記一面３１の形状は、凹みがなくて、膨らんでいるので、頭部３０の一面３１には、埃等の汚れや雨水等の水が溜まらない。このため、頭部３０に錆等の腐食が発生することを防止できる。特に、切り刃先ねじ１を屋外で使用するときに顕著となる。 Moreover, since the shape of the one surface 31 of the head 30 of the cutting blade tip screw 1 has no dent and swells, dirt such as dust and water such as rainwater do not collect on the one surface 31 of the head 30. For this reason, it can prevent that corrosion, such as rust, generate | occur | produces in the head 30. FIG. This is particularly noticeable when the cutting edge screw 1 is used outdoors.

次に、上記切り刃先ねじ１の頭部３０の成型を説明すると、ねじ材料を頭部成型用の金型で拘束した状態で、鍔部２０の一面２１に溝部２６を形成するように鍔部２０の一面２１をポンチ等で押し込むことで、押し込まれた部分の体積（材料）が頭部３０に流れ込む。この結果、頭部３０の外形を高精度に成形できる。言い換えると、上記鍔部２０の上記一面２１は、環状の溝部２６を有するので、頭部３０の外形の精度が良好となる。 Next, the molding of the head portion 30 of the cutting blade tip screw 1 will be described. In a state where the screw material is constrained by the head molding die, the flange portion is formed so as to form the groove portion 26 on the one surface 21 of the flange portion 20. The volume (material) of the pushed portion flows into the head 30 by pushing the one surface 21 of the 20 with a punch or the like. As a result, the outer shape of the head 30 can be formed with high accuracy. In other words, since the one surface 21 of the flange portion 20 has the annular groove portion 26, the accuracy of the outer shape of the head 30 is improved.

したがって、工具により頭部３０を嵌合して保持しながら切り刃先ねじ１を被取付材や役物にねじ込むとき、工具と頭部３０との間のがたつきがなくて、切り刃先ねじ１のねじ込みの精度を良好に維持できる。 Accordingly, when the cutting blade tip screw 1 is screwed into a material to be attached or an accessory while the head portion 30 is fitted and held by a tool, there is no rattling between the tool and the head portion 30, and the cutting blade tip screw 1. The screwing accuracy can be maintained well.

上記構成の切り刃先ねじ１によれば、上記頭部３０の上記一面３１の形状は、凹みがなくて、膨らんでいるので、頭部３０の一面３１には、埃等の汚れや雨水等の水が溜まらない。このため、頭部３０の腐食を防止できる。 According to the cutting blade tip screw 1 having the above-described configuration, the shape of the one surface 31 of the head 30 has no dent and swells. Therefore, the one surface 31 of the head 30 has dirt such as dust and rainwater. Water does not collect. For this reason, corrosion of the head 30 can be prevented.

また、上記鍔部２０の上記一面２１は、環状の溝部２６を有するので、頭部３０を金型で拘束して成型するとき、鍔部２０の一面２１に溝部２６を形成するように鍔部２０の一面２１を押し込むことで、押し込まれた部分の体積（材料）が頭部３０に流れ込んで、頭部３０の外形を高精度に成形できる。このように、頭部３０の外形の精度が良好であるので、工具により頭部３０を嵌合して保持しながら切り刃先ねじ１を被取付材や役物にねじ込むとき、工具と頭部３０との間のがたつきがなくて、切り刃先ねじ１のねじ込みの精度を良好に維持できる。 Moreover, since the said one surface 21 of the said collar part 20 has the cyclic | annular groove part 26, when restraining and molding the head 30 with a metal mold | die, the collar part 26 is formed in the one surface 21 of the collar part 20 By pressing the one surface 21 of 20, the volume (material) of the pressed portion flows into the head 30 and the outer shape of the head 30 can be formed with high accuracy. As described above, since the accuracy of the outer shape of the head 30 is good, when the cutting blade tip screw 1 is screwed into a material to be attached or an accessory while the head 30 is fitted and held by a tool, the tool and the head 30 are used. It is possible to maintain good screwing accuracy of the cutting edge screw 1.

また、上記鍔部２０の上記一面２１は、上記座面部２５と上記溝部２６と上記リブ部２７とを有し、上記シール部材４０は、上記座面部２５に接触すると共に、上記シール部材４０の少なくとも一部が、上記溝部２６に入り込むので、切り刃先ねじ１を被取付材や役物にねじ込んだとき、シール部材４０は、被取付材および役物と鍔部２０との間に挟持されつつ、座面部２５、溝部２６およびリブ部２７の凹凸構造に、挟み込まれる。このため、鍔部２０に対するシール部材４０の動きを抑制でき、止水性が向上する。 The one surface 21 of the flange portion 20 includes the seat surface portion 25, the groove portion 26, and the rib portion 27. The seal member 40 is in contact with the seat surface portion 25, and the seal member 40. Since at least a part of the groove 26 is inserted, when the cutting edge screw 1 is screwed into the attached material or accessory, the seal member 40 is sandwiched between the attached material and the accessory and the flange 20. , And sandwiched in the concavo-convex structure of the seat surface portion 25, the groove portion 26 and the rib portion 27. For this reason, the movement of the sealing member 40 with respect to the collar part 20 can be suppressed, and water-stopping is improved.

また、上記軸部１０の他端には、切刃１３が設けられているので、切り刃先ねじ１を被取付材や役物にねじ込むとき、切刃１３により被取付材や役物を先行して切り込むことができ、切り刃先ねじ１をスムーズにねじ込むことができる。 Moreover, since the cutting blade 13 is provided at the other end of the shaft portion 10, when the cutting blade tip screw 1 is screwed into the attached material or accessory, the cutting blade 13 leads the attached material or accessory. The cutting edge screw 1 can be smoothly screwed in.

なお、比較例として、例えば、木ねじなどの下穴加工を必要とするねじにおいて、ねじ頭の天面の形状が、凹みがなくて、平坦または膨らんでいる場合、ねじ頭の外形（輪郭）の精度は低下することになる。つまり、工具によりねじ頭を嵌合して保持しながら木ねじを被取付材や役物にねじ込むとき、工具とねじ頭との間にがたつきが発生する。しかし、木ねじは、既に下穴が加工されている被取付材や役物にねじ込まれるため、木ねじのねじ込み精度は、必要とされない。このため、木ねじでは、上記切り刃先ねじ１とは異なり、ねじ頭の外形の精度は、必要とされていない。 As a comparative example, for example, in the case of a screw that requires drilling of a hole such as a wood screw, when the top surface of the screw head is flat or bulged without a dent, the outer shape (contour) of the screw head Accuracy will be reduced. That is, when the wood screw is screwed into the attachment material or the accessory while the screw head is fitted and held by the tool, rattling occurs between the tool and the screw head. However, since the wood screw is screwed into the attached material or the accessory whose pilot hole has already been processed, the screwing accuracy of the wood screw is not required. For this reason, in the wood screw, unlike the cutting edge screw 1, the accuracy of the external shape of the screw head is not required.

なお、この考案は上述の実施形態に限定されない。例えば、頭部の軸部と反対側の一面の形状は、凹みがなくて、平坦であってもよい。この場合でも、頭部の一面には、埃等の汚れや雨水等の水が溜まらないため、頭部の腐食を防止できる。The invention is not limited to the above-described embodiment. For example, the shape of one surface of the head opposite to the shaft portion may be flat without a dent. Even in this case, since dirt such as dust and water such as rainwater do not collect on one surface of the head, corrosion of the head can be prevented.

また、頭部、鍔部およびシール部材の大きさや形状は、設計変更可能である。例えば、頭部の外形は、六角形以外に、四角形等の多角形であってもよい。鍔部の外形は、円形以外に、多角形であってもよい。 In addition, the size and shape of the head, the collar, and the seal member can be changed in design. For example, the outer shape of the head may be a polygon such as a quadrangle other than a hexagon. The outer shape of the collar portion may be a polygon other than a circle.

また、軸部のねじ山は、二条ねじ以外に、一条ねじ等であってもよい。また、切刃の数量を複数とし、切刃の形状を例えば螺旋状やドリル状に形成しもよい。また、切り刃先ねじを屋内で用いてもよい。 Further, the thread of the shaft portion may be a single thread or the like in addition to the double thread. Further, the number of cutting blades may be plural, and the shape of the cutting blade may be formed in a spiral shape or a drill shape, for example. Moreover, you may use a cutting blade tip screw indoors.

１切り刃先ねじ
１０軸部
１１第１のねじ山
１２第２のねじ山
１３切刃
２０鍔部
２１一面（裏面）
２５座面部
２６溝部
２７リブ部
３０頭部
３１一面（天面）
３２膨出部
４０シール部材DESCRIPTION OF SYMBOLS 1 Cutting blade tip screw 10 Shaft part 11 1st thread 12 Second thread 13 Cutting edge 20 ridge part 21 One surface (back surface)
25 Seat surface portion 26 Groove portion 27 Rib portion 30 Head portion 31 One surface (top surface)
32 bulging part 40 sealing member

Claims

外周面にねじ山が設けられている軸部と、
この軸部の一端側に位置する頭部と、
上記軸部の一端と上記頭部との間に位置する鍔部と、
上記軸部の他端に位置する切刃と、
上記軸部に貫通されて上記鍔部の上記軸部側の一面に位置する環状のシール部材とを備え、上記頭部の上記軸部と反対側の一面の形状は、凹みがなくて、平坦または膨らんでおり、上記鍔部の上記軸部側の上記一面は、上記軸部の外側に位置する座面部と、この座面部の外側に位置する環状の溝部と、この溝部の外側に位置する環状のリブ部とを有し、上記シール部材は、上記座面部に接触すると共に、上記シール部材の少なくとも一部が、上記溝部に入り込むことを特徴とする切り刃先ねじ。A shaft portion provided with a thread on the outer peripheral surface;
A head located on one end side of the shaft,
A collar portion located between one end of the shaft portion and the head portion;
A cutting blade located at the other end of the shaft,
An annular seal member that is penetrated by the shaft portion and located on one surface of the flange portion on the shaft portion side, and the shape of the one surface on the opposite side of the shaft portion of the head portion is flat and flat. Alternatively, the one surface on the shaft portion side of the flange portion is swelled, a seat surface portion located outside the shaft portion, an annular groove portion located outside the seat surface portion, and located outside the groove portion. A cutting blade tip screw having an annular rib portion, wherein the seal member contacts the seat surface portion, and at least a part of the seal member enters the groove portion.