JP2016050620A

JP2016050620A - screw

Info

Publication number: JP2016050620A
Application number: JP2014175995A
Authority: JP
Inventors: 哲史中田; Tetsushi Nakata
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2014-08-29
Filing date: 2014-08-29
Publication date: 2016-04-11
Anticipated expiration: 2034-08-29
Also published as: JP6289312B2

Abstract

PROBLEM TO BE SOLVED: To provide a screw capable of preventing occurrence of failure resulting from metal scraps by storing scraps occurring in screw fastening and discharging them from a screw head side.SOLUTION: A screw 1 includes: a screw head 2 in which an opening part 2b is formed; a male screw part 3 that is provided integrally with the screw head 2, and in which an opening part 3a is formed at a screw portion; and a scrap storage part 5 that is provided in the screw head 2 and the male screw part 3, and is a cavity communicating the opening part 2b and the opening part 3a.SELECTED DRAWING: Figure 1

Description

この発明は、ねじ締めを行った際に雌ねじ側から発生した屑を収容して排出可能なねじに関する。 The present invention relates to a screw capable of containing and discharging waste generated from the female screw side when screw tightening is performed.

製品の金属部材間をねじ締めする際に、雌ねじ側から発生した金属屑が製品内部に侵入する場合があった。このような金属屑が製品内部の電気部品に接触すると、電気的不具合（ショートなど）を発生させる可能性がある。このため金属屑が製品内部に侵入することを防ぐ必要がある。 When screwing between metal members of a product, metal scrap generated from the female screw side may enter the product. When such metal scraps come into contact with the electrical components inside the product, there is a possibility of causing an electrical failure (such as a short circuit). For this reason, it is necessary to prevent metal scraps from entering the product.

特許文献１には、ねじ山の形状を改良して雌ねじの成形屑の発生を減少させた部品締結用のタッピンねじが開示されている。このねじは、ねじ締めにおける金属屑の発生が減少するので、上述の金属屑に起因した電気的不具合の発生を低減させることができる。 Patent Document 1 discloses a tapping screw for fastening a component in which the shape of a screw thread is improved to reduce the generation of internal thread molding waste. Since this screw reduces the generation of metal debris during screw tightening, it is possible to reduce the occurrence of electrical problems due to the above-mentioned metal debris.

特開２００９−１５０３４号公報JP 2009-15034 A

特許文献１に代表される従来の技術は、ねじ締めにおける金属屑の発生を完全に抑えるものではない。このため、金属屑が一度発生すると、雄ねじのねじ込みによって金属屑が製品内部に導かれ、金属屑に起因した電気的不具合が発生する可能性があるという課題があった。 The conventional technology represented by Patent Document 1 does not completely suppress the generation of metal scraps during screw tightening. For this reason, there is a problem that once the metal scrap is generated, the metal scrap is guided into the product by the screwing of the male screw, and an electrical failure due to the metal scrap may occur.

この発明は、上記のような課題を解決するためになされたもので、ねじ締めで発生した屑を収容してねじ頭側から排出することにより金属屑に起因した不具合の発生を防ぐことができるねじを得ることを目的とする。 This invention was made in order to solve the above problems, and can prevent the occurrence of problems caused by metal scraps by storing scraps generated by screw tightening and discharging them from the screw head side. The purpose is to obtain a screw.

この発明に係るねじは、第１の開口部が形成されたねじ頭と、ねじ頭と一体に設けられ、ねじ部分に第２の開口部が形成された雄ねじ部と、ねじ頭および雄ねじ部に設けられ、第１の開口部と第２の開口部とを連通させる空洞である屑収容部とを備える。 The screw according to the present invention includes a screw head in which a first opening is formed, a male screw part that is provided integrally with the screw head and in which a second opening is formed in the screw part, and a screw head and a male screw part. And a waste container that is a cavity that communicates the first opening and the second opening.

この発明によれば、ねじ締めで発生した屑を収容してねじ頭側から排出することにより金属屑に起因した不具合の発生を防ぐことができるという効果がある。 According to the present invention, there is an effect that it is possible to prevent the occurrence of defects caused by metal scraps by storing scraps generated by screw tightening and discharging them from the screw head side.

この発明の実施の形態１に係るねじの斜視図である。It is a perspective view of the screw which concerns on Embodiment 1 of this invention. 実施の形態１に係るねじの断面図（Ａ−Ａ線で切断）である。It is sectional drawing (cut | disconnected by the AA line) of the screw which concerns on Embodiment 1. FIG. 実施の形態１に係るねじの断面図（Ｂ−Ｂ線で切断）である。It is sectional drawing (cut | disconnected by the BB line) of the screw which concerns on Embodiment 1. FIG. 実施の形態１に係るねじの断面図（Ｃ−Ｃ線で切断）である。It is sectional drawing (cut | disconnected by CC line) of the screw which concerns on Embodiment 1. FIG. この発明の実施の形態２に係るねじの斜視図である。It is a perspective view of the screw concerning Embodiment 2 of this invention. 実施の形態２に係るねじの断面図（Ｄ−Ｄ線で切断）である。It is sectional drawing (cut | disconnected by DD line) of the screw which concerns on Embodiment 2. FIG. この発明の実施の形態３に係るねじの斜視図である。It is a perspective view of the screw which concerns on Embodiment 3 of this invention. 実施の形態３に係るねじの断面図（Ｅ−Ｅ線で切断）である。It is sectional drawing (cut | disconnected by the EE line | wire) of the screw which concerns on Embodiment 3. 実施の形態３に係るねじの断面図（Ｆ−Ｆ線で切断）である。It is sectional drawing (cut | disconnected by the FF line) of the screw which concerns on Embodiment 3. FIG.

実施の形態１．
図１は、この発明の実施の形態１に係るねじの斜視図である。図１において、ねじ１は、ねじ頭２とこれに一体に形成された雄ねじ部３とを備えたねじであり、例えば、板金材などの金属部材間を締結するために用いられる。
ねじ頭２の端面２ａには、本発明における第１の開口部である開口部２ｂが形成されており、開口部２ｂから柱状部４の端面４ａが露出している。
柱状部４の端面４ａには、ドライバーが差し込まれてねじ込み駆動力が伝達されるねじ溝４ｂが形成される。また、雄ねじ部３のねじ部分には、本発明の第２の開口部に相当する開口部３ａが形成されている。 Embodiment 1 FIG.
FIG. 1 is a perspective view of a screw according to Embodiment 1 of the present invention. In FIG. 1, a screw 1 is a screw provided with a screw head 2 and a male screw part 3 formed integrally therewith, and is used for fastening between metal members such as a sheet metal material, for example.
The end surface 2a of the screw head 2 is formed with an opening 2b which is the first opening in the present invention, and the end surface 4a of the columnar portion 4 is exposed from the opening 2b.
On the end surface 4 a of the columnar portion 4, a screw groove 4 b into which a screwdriver is inserted and a screw driving force is transmitted is formed. Further, an opening 3a corresponding to the second opening of the present invention is formed in the screw portion of the male screw portion 3.

図２は、実施の形態１に係るねじの断面図であり、図２（ａ）は上面図、図２（ｂ）は図２（ａ）のＡ−Ａ線で切った断面矢示図である。図２（ｂ）に示すように、ねじ頭２と雄ねじ部３には、開口部２ｂからねじ軸と同軸に形成された空洞である屑収容部５が形成されている。柱状部４は、この屑収容部５内にねじ軸と同軸に設けられる。
また、図２（ａ）に示すように、柱状部４の端面４ａは、ねじ溝４ｂに沿った形状（プラス形状）の端面である。ここでは、柱状部４は、ねじ軸方向断面がプラス形状の柱状部となっている。 2 is a cross-sectional view of the screw according to Embodiment 1, FIG. 2 (a) is a top view, and FIG. 2 (b) is a cross-sectional arrow view taken along line AA of FIG. 2 (a). is there. As shown in FIG. 2 (b), the screw head 2 and the male screw portion 3 are formed with a waste accommodating portion 5 which is a cavity formed coaxially with the screw shaft from the opening 2b. The columnar portion 4 is provided in the scrap accommodating portion 5 coaxially with the screw shaft.
Moreover, as shown to Fig.2 (a), the end surface 4a of the columnar part 4 is an end surface of the shape (plus shape) along the screw groove 4b. Here, the columnar portion 4 is a columnar portion having a positive cross section in the screw axis direction.

図３（ａ）は実施の形態１に係るねじの側面図（開口部３ａ側の側面図）であり、図３（ｂ）は図３（ａ）のＢ−Ｂ線で切った断面矢示図である。図４（ａ）は実施の形態１に係るねじの側面図であり、図４（ｂ）は図４（ａ）のＣ−Ｃ線で切った断面矢示図である。図３（ａ）に示すように、開口部３ａは、雄ねじ部３のねじ部分をねじ軸方向に穿った長穴である。また、開口部３ａは、図３（ｂ）および図４（ｂ）に示すように屑収容部５に連通している。 3A is a side view of the screw according to Embodiment 1 (side view of the opening 3a side), and FIG. 3B is a cross-sectional arrow cut along the line BB in FIG. 3A. FIG. 4A is a side view of the screw according to Embodiment 1, and FIG. 4B is a cross-sectional arrow view taken along the line CC in FIG. 4A. As shown in FIG. 3 (a), the opening 3a is a long hole formed by drilling the threaded portion of the male threaded portion 3 in the screw axis direction. Moreover, the opening part 3a is connected to the waste accommodating part 5, as shown in FIG.3 (b) and FIG.4 (b).

なお、開口部３ａは、ねじ締めで発生した金属屑が誘い込まれるように、雄ねじ部３のねじ部分に形成されていればよい。ただし、図３（ａ）に示すように、ねじ部分における複数のねじ山とねじ谷に渡って形成された長穴とすることで、ねじ部分における金属屑を効率よく収容することができる。 In addition, the opening part 3a should just be formed in the screw part of the external thread part 3 so that the metal waste generated by the screw fastening may be drawn. However, as shown to Fig.3 (a), the metal waste in a screw part can be efficiently accommodated by setting it as the elongate hole formed over the some screw thread and screw valley in a screw part.

ねじ１で板金材間をねじ締めすると、雄ねじ部３が雌ねじを削って金属屑が発生する。この金属屑は、ねじ１のねじ締めに応じて雄ねじ部３のねじ部分を移動し、開口部３ａに到達すると屑収容部５へ誘い込まれる。これにより、金属屑は屑収容部５に収容される。
ねじ締めに応じて金属屑が屑収容部５内に溜まっていくと、先に収容された金属屑が、新たに収容された金属屑により押されて屑収容部５の内部でねじ頭２に向けて徐々に移動する。そして、ねじ頭２の端面２ａに達した金属屑は開口部２ｂから排出される。 When the sheet metal member is screwed with the screw 1, the male screw portion 3 cuts the female screw to generate metal scrap. The metal scrap moves along the screw portion of the male screw portion 3 according to the screw tightening of the screw 1, and is led into the scrap accommodating portion 5 when reaching the opening 3 a. Thereby, metal waste is accommodated in the waste accommodating part 5.
When the metal scrap accumulates in the scrap container 5 in accordance with the screw tightening, the metal scrap previously stored is pushed by the newly stored metal scrap to the screw head 2 inside the scrap container 5. Move gradually toward. And the metal scrap which reached the end surface 2a of the screw head 2 is discharged | emitted from the opening part 2b.

以上のように、この実施の形態１によれば、ねじ１が、開口部２ｂが形成されたねじ頭２と、ねじ頭２と一体に設けられ、ねじ部分に開口部３ａが形成された雄ねじ部３と、ねじ頭２および雄ねじ部３に設けられ、開口部２ｂと開口部３ａとを連通させる空洞である屑収容部５とを備える。このように構成することで、ねじ締めで発生した金属屑が開口部３ａから屑収容部５内に収容されてねじ頭２の開口部２ｂから排出される。これにより、金属屑を的確に排出することができ、金属屑に起因した不具合の発生を防止できる。
例えば、電子機器の外側からねじ締めする際に、金属屑は、屑収容部５に溜まり最終的に開口部２ｂから排出される。従って、金属屑がねじ穴を通って電子機器内に落ちることがない。 As described above, according to the first embodiment, the screw 1 is provided integrally with the screw head 2 in which the opening 2b is formed and the screw head 2, and the male screw in which the opening 3a is formed in the screw portion. The part 3 is provided with a scrap housing part 5 that is provided in the screw head 2 and the male screw part 3 and is a cavity that allows the opening 2b and the opening 3a to communicate with each other. By comprising in this way, the metal waste which generate | occur | produced by screwing is accommodated in the waste accommodating part 5 from the opening part 3a, and is discharged | emitted from the opening part 2b of the screw head 2. FIG. Thereby, metal waste can be discharged | emitted correctly and generation | occurrence | production of the malfunction resulting from metal waste can be prevented.
For example, when screwing from the outside of the electronic device, the metal waste is collected in the waste storage portion 5 and finally discharged from the opening 2b. Accordingly, the metal scrap does not fall into the electronic device through the screw hole.

また、この実施の形態１によれば、屑収容部５が、ねじ頭２の端面２ａに形成された開口部２ｂからねじ軸と同軸に形成された空洞であり、屑収容部５内にねじ軸と同軸に設けられ、ねじ溝４ｂの形成された端面４ａが開口部２ｂから露出する柱状部４を備える。
このように構成することで、柱状部４の周囲を屑収容部５とすることができ、より多くの金属屑を収容することが可能となる。 Further, according to the first embodiment, the waste container 5 is a cavity formed coaxially with the screw shaft from the opening 2b formed in the end surface 2a of the screw head 2, and the waste container 5 is screwed into the waste container 5 An end surface 4a provided coaxially with the shaft and having a thread groove 4b is provided with a columnar portion 4 exposed from the opening 2b.
By comprising in this way, the circumference | surroundings of the columnar part 4 can be made into the waste accommodating part 5, and it becomes possible to accommodate more metal waste.

さらに、この実施の形態１によれば、開口部３ａは、雄ねじ部３のねじ部分をねじ軸方向に沿って穿った長穴である。このように構成することで、ねじ締めで発生した金属屑を効率よく収容することができる。 Furthermore, according to the first embodiment, the opening 3a is a long hole that is formed by drilling the screw portion of the male screw portion 3 along the screw axis direction. By comprising in this way, the metal scrap which generate | occur | produced by screwing can be accommodated efficiently.

実施の形態２．
図５は、この発明の実施の形態２に係るねじの斜視図である。図５において、ねじ１Ａは、上記実施の形態１と同様に、ねじ頭２とこれに一体に形成された雄ねじ部３とを備えたねじであり、例えば、板金材などの金属部材間を締結するために用いられる。
ねじ頭２の端面２ａには、本発明における第１の開口部である開口部２ｃが形成されており、雄ねじ部３のねじ部分には、本発明の第２の開口部に相当する開口部３ｂが形成されている。 Embodiment 2. FIG.
FIG. 5 is a perspective view of a screw according to Embodiment 2 of the present invention. In FIG. 5, a screw 1A is a screw provided with a screw head 2 and a male screw portion 3 formed integrally with the screw head 2 as in the first embodiment. For example, a screw 1A is fastened between metal members such as a sheet metal material. Used to do.
The end surface 2a of the screw head 2 is formed with an opening 2c which is the first opening in the present invention, and the screw portion of the male screw 3 has an opening corresponding to the second opening of the present invention. 3b is formed.

図６は、実施の形態２に係るねじの断面図であり、図６（ａ）は上面図、図６（ｂ）は図６（ａ）のＤ−Ｄ線で切った断面矢示図である。図６（ｂ）に示すように、ねじ頭２と雄ねじ部３には屑収容部６が形成されている。屑収容部６は、開口部２ｃと開口部３ｂとを連通させる管状の空間である。 6A and 6B are cross-sectional views of the screw according to the second embodiment, in which FIG. 6A is a top view, and FIG. 6B is a cross-sectional arrow view taken along the line DD in FIG. is there. As shown in FIG. 6 (b), a waste container 6 is formed on the screw head 2 and the male screw portion 3. The waste container 6 is a tubular space that allows the opening 2c and the opening 3b to communicate with each other.

ねじ１Ａで板金材間をねじ締めすると、雄ねじ部３が雌ねじを削ることにより金属屑が発生する。この金属屑は、ねじ１Ａのねじ締めに応じて雄ねじ部３のねじ部分を移動し、開口部３ｂに到達すると屑収容部６へ誘い込まれる。これにより、金属屑は屑収容部６に収容される。また、ねじ締めに応じて金属屑が屑収容部６内に溜まっていくと、先に収容された金属屑が、新たに収容された金属屑により押されて屑収容部６の内部でねじ頭２に向けて徐々に移動する。そして、ねじ頭２の端面２ａに達した金属屑は、開口部２ｃから排出される。 When the sheet metal members are screwed together with the screws 1A, the male screw portion 3 cuts the female screws to generate metal scrap. This metal scrap moves along the screw portion of the male screw portion 3 in response to the screw tightening of the screw 1A, and when it reaches the opening 3b, it is drawn into the scrap accommodating portion 6. Thereby, metal waste is accommodated in the waste accommodating part 6. Further, when the metal scrap accumulates in the scrap accommodating portion 6 in accordance with the screw tightening, the metal scrap previously accommodated is pushed by the newly accommodated metal scrap and is screwed inside the scrap accommodating portion 6. Move gradually toward 2. And the metal scrap which reached the end surface 2a of the screw head 2 is discharged | emitted from the opening part 2c.

以上のように、この実施の形態２によれば、屑収容部６が、開口部２ｃと開口部３ｂとを連通させる管状の空洞である。このように構成することで、実施の形態１と同様の効果を得ることができる。またねじ１Ａを管状に穴を穿つだけで屑収容部６を作成でき、製造が容易である。 As described above, according to the second embodiment, the waste container 6 is a tubular cavity that allows the opening 2c and the opening 3b to communicate with each other. By configuring in this way, the same effect as in the first embodiment can be obtained. Moreover, the waste container 6 can be created simply by drilling the screw 1A into a tubular shape, which is easy to manufacture.

実施の形態３．
図７は、この発明の実施の形態３に係るねじの斜視図である。図７において、ねじ１Ｂは、上記実施の形態１と同様に、ねじ頭２とこれに一体に形成された雄ねじ部３とを備えたねじであり、例えば、板金材などの金属部材間を締結するために用いられる。
ねじ頭２の端面２ａには、本発明における第１の開口部である開口部２ｄが形成されており、雄ねじ部３のねじ部分には、本発明の第２の開口部に相当する開口部３ｃが形成されている。 Embodiment 3 FIG.
FIG. 7 is a perspective view of a screw according to Embodiment 3 of the present invention. In FIG. 7, a screw 1B is a screw provided with a screw head 2 and a male screw portion 3 formed integrally with the screw head 2 as in the first embodiment. For example, a metal member such as a sheet metal material is fastened. Used to do.
An opening 2d, which is the first opening in the present invention, is formed on the end surface 2a of the screw head 2, and an opening corresponding to the second opening of the present invention is formed in the threaded portion of the male screw 3. 3c is formed.

図８（ａ）は実施の形態３に係るねじの上面図、図８（ｂ）は図８（ａ）のＥ−Ｅ線で切った断面矢示図である。また、図９（ａ）は実施の形態３に係るねじの側面図であり、図９（ｂ）は図９（ａ）のＦ−Ｆ線で切った断面矢示図である。図８（ｂ）に示すように、ねじ頭２と雄ねじ部３には空洞部７ａが形成されている。空洞部７ａは、ねじ頭２の端面２ａからねじ軸方向に雄ねじ部３まで穿った孔部であり、開口部２ｄに連通している。 FIG. 8A is a top view of the screw according to Embodiment 3, and FIG. 8B is a cross-sectional arrow view taken along the line EE of FIG. 8A. FIG. 9A is a side view of the screw according to Embodiment 3, and FIG. 9B is a cross-sectional arrow view taken along the line FF in FIG. 9A. As shown in FIG. 8 (b), a cavity 7 a is formed in the screw head 2 and the male screw portion 3. The hollow portion 7a is a hole that is bored from the end surface 2a of the screw head 2 to the male screw portion 3 in the screw axis direction, and communicates with the opening 2d.

開口部３ｃは、図９（ａ）に示すように、雄ねじ部３のねじ部分をねじ軸方向に沿って穿った長穴である。また、空洞部７ｂは、図９（ｂ）に示すように、雄ねじ部３をねじ軸方向に内部まで切り欠いて形成された空洞である。この空洞部７ｂに連通する開口が開口部３ｃである。なお、実施の形態３における屑収容部７は、空洞部７ａと空洞部７ｂとを繋いだ空洞である。 As shown in FIG. 9A, the opening 3c is a long hole formed by drilling the threaded portion of the male threaded portion 3 along the screw axis direction. Moreover, the cavity part 7b is a cavity formed by notching the male screw part 3 to the inside in the screw axis direction, as shown in FIG. 9B. An opening communicating with the hollow portion 7b is an opening 3c. In addition, the waste accommodating part 7 in Embodiment 3 is a cavity which connected the cavity part 7a and the cavity part 7b.

ねじ１Ｂで板金材間をねじ締めすると、雄ねじ部３が雌ねじを削ることにより金属屑が発生する。この金属屑は、ねじ１Ｂのねじ締めに応じて雄ねじ部３のねじ部分を移動し、開口部３ｃに到達すると屑収容部７へ誘い込まれる。これにより、金属屑は屑収容部７に収容される。また、ねじ締めに応じて金属屑が屑収容部７内に溜まっていくと、先に収容された金属屑が、新たに収容された金属屑により押されて屑収容部７の内部でねじ頭２に向けて徐々に移動する。そして、ねじ頭２の端面２ａに達した金属屑は、開口部２ｄから排出される。 When the sheet metal member is screwed with the screw 1B, the male screw portion 3 cuts the female screw to generate metal scrap. This metal scrap moves along the screw portion of the male screw portion 3 in response to the screw tightening of the screw 1B, and when it reaches the opening 3c, it is drawn into the scrap accommodating portion 7. Thereby, metal waste is accommodated in the waste accommodating part 7. Further, when the metal scrap accumulates in the scrap accommodating portion 7 in accordance with the screw tightening, the metal scrap previously accommodated is pushed by the newly accommodated metal scrap and is screwed inside the scrap accommodating portion 7. Move gradually toward 2. And the metal scrap which reached the end surface 2a of the screw head 2 is discharged | emitted from the opening part 2d.

以上のように、この実施の形態３によれば、屑収容部７が、雄ねじ部３をねじ軸方向に内部まで切り欠いて形成された空洞部７ｂと開口部２ｄに連通する空洞部７ａとを繋いだ空洞である。このように構成することで、実施の形態１と同様の効果を得ることができる。また、屑収容部７を、ねじ軸方向に穿って空洞部７ａを形成する工程と、雄ねじ部３をねじ軸方向に切り欠いて空洞部７ｂを形成する工程とで容易に作成することができる。 As described above, according to the third embodiment, the waste container 7 includes the cavity 7b formed by cutting out the male screw 3 to the inside in the screw axis direction, and the cavity 7a communicating with the opening 2d. It is a cavity that connects By configuring in this way, the same effect as in the first embodiment can be obtained. Moreover, the waste container 7 can be easily created by the process of forming the cavity 7a by drilling in the screw axis direction and the process of forming the cavity 7b by notching the male screw 3 in the screw axis direction. .

なお、本発明はその発明の範囲内において、各実施の形態の自由な組み合わせ、あるいは各実施の形態の任意の構成要素の変形、もしくは各実施の形態において任意の構成要素の省略が可能である。 In the present invention, within the scope of the invention, any combination of each embodiment, any component of each embodiment can be modified, or any component can be omitted in each embodiment. .

１，１Ａ，１Ｂねじ、２ねじ頭、２ａねじ頭の端面、２ｂ〜２ｄ開口部（第１の開口部）、３雄ねじ部、３ａ〜３ｃ開口部（第２の開口部）、４柱状部、４ａ柱状部の端面、４ｂねじ溝、５〜７屑収容部、７ａ，７ｂ空洞部。 1, 1A, 1B screw, 2 screw head, 2a end face of screw head, 2b to 2d opening (first opening), 3 male screw, 3a to 3c opening (second opening), 4 columnar portion 4a End face of columnar part, 4b Thread groove, 5-7 Scrap storage part, 7a, 7b Cavity part.

Claims

A screw head formed with a first opening;
A male screw portion provided integrally with the screw head and having a second opening formed in the screw portion;
A screw provided with a scrap housing portion which is provided in the screw head and the male screw portion and is a cavity for communicating the first opening and the second opening.

The waste container is a cavity formed coaxially with the screw shaft from the first opening formed on the end face of the screw head,
2. The screw according to claim 1, further comprising: a columnar portion that is provided coaxially with the screw shaft in the waste accommodating portion and has an end surface in which a screw groove is formed exposed from the first opening.

The screw according to claim 1, wherein the waste container is a tubular cavity that allows the first opening and the second opening to communicate with each other.

The screw according to any one of claims 1 to 3, wherein the second opening is an elongated hole formed by drilling a screw portion of the male screw portion along a screw axis direction.

The said waste container part is a cavity which connected the cavity formed by notching the said external thread part to the inside in the screw-axis direction, and the cavity connected to a said 1st opening part. The described screw.