JP2019014023A - Screw extraction tool - Google Patents

Screw extraction tool Download PDF

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JP2019014023A
JP2019014023A JP2017134090A JP2017134090A JP2019014023A JP 2019014023 A JP2019014023 A JP 2019014023A JP 2017134090 A JP2017134090 A JP 2017134090A JP 2017134090 A JP2017134090 A JP 2017134090A JP 2019014023 A JP2019014023 A JP 2019014023A
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Japan
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screw
blade
screw extraction
tip
shaft body
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JP6301537B1 (en
Inventor
高崎　充弘
Mitsuhiro Takasaki
充弘 高崎
雅則 安藤
Masanori Ando
雅則 安藤
真之介 川合
Shinnosuke Kawai
真之介 川合
真優 福田
Mayu Fukuda
真優 福田
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ENGINEER Inc
Eng Inc
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ENGINEER Inc
Eng Inc
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Priority to JP2017134090A priority Critical patent/JP6301537B1/en
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Priority to PCT/JP2018/015844 priority patent/WO2019008865A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/18—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same withdrawing broken threaded parts or twist drills

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)

Abstract

To provide a screw extraction tool capable of easily extracting a screw with its engaging groove crushed.SOLUTION: A screw extraction tool 1 for extracting a screw whose engaging groove at a head of the screw has been crushed comprises a shaft body 101 and a screw extraction part 102 formed at a tip part of the shaft body 101 and having a shape toward tapered toward the tip. One or more blades 104 each having an edge 104a on the outer peripheral side and extending in a spiral shape from the tip side of the screw extraction part 102 toward the rear end side are formed on the outer peripheral side of the screw extraction part 102. An inclination angle of a tapered surface 105 including the edge 104a of the one or more blades 104 relative to an axis 101a of the shaft body 101 is larger than 26.5 degrees.SELECTED DRAWING: Figure 1

Description

本発明は、ネジの抜取りに用いられる工具に関するものである。   The present invention relates to a tool used for extracting a screw.

従来のネジの抜取りに用いられる工具として、柄の一端部を先尖に形成し、先端の先尖部よりテーパー状に後部が大径となる左ネジの抜き取りネジを形成してなるネジ抜き用ビットであって、抜き取りネジの刃先角θを４５°とし、先端から後側に向かって大径となる前記テーパー状のネジ部の角度αを１５〜２０°としていることを特徴とするネジ抜き用ビットが知られていた（例えば、特許文献１参照）。   As a tool used for conventional screw extraction, one end of the handle is formed at the tip of the tip, and a screw for removing the left screw whose rear portion has a larger diameter than the tip of the tip is formed. A screw removal tool characterized in that the cutting edge angle θ of the extraction screw is 45 °, and the angle α of the tapered screw portion having a larger diameter from the tip toward the rear is 15 to 20 °. Bits have been known (see, for example, Patent Document 1).

実願２００２−３３９７号公報（第１頁、第１図等）No. 2002-3397 (first page, FIG. 1 etc.)

しかしながら、従来の技術においては、ネジ回し用の係止穴が潰れたネジ頭部の中心部にあらかじめ下穴を穿設し、この下穴に抜き取りネジの先をネジ込み、ネジがネジ抜き用ビットと供回りするようにして、ネジを緩む方向に回転させて抜き取るため、ネジ頭部に予め下孔を穿設する必要があり、作業に手間がかかり、係止穴が潰れたネジを容易に抜き取ることができない、という課題があった。   However, in the prior art, a pilot hole is made in advance in the center of the screw head where the locking hole for screwdriver is crushed, and the tip of the extraction screw is screwed into this pilot hole. Since the screw is rotated in the loosening direction so that it can be rotated with the bit, it is necessary to drill a pilot hole in the screw head in advance. There was a problem that it could not be extracted.

本発明は、上記のような課題を解消するためになされたものであり、係合溝が潰れたネジを容易に抜き取ることができるネジ抜取工具を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a screw extraction tool that can easily extract a screw whose engagement groove is crushed.

本発明のネジ抜取工具は、ネジ頭部の係合溝が潰れたネジを抜き取るためのネジ抜取工具であって、軸体と、軸体の先端部分に形成されており、先端に向かって先細りとなる形状を有するネジ抜取部と、を備え、ネジ抜取部の外周側には、刃先が外周側に設けられた刃であって、ネジ抜取部の先端側から後端側に向かって螺旋状に伸びる１以上の刃が形成されており、１以上の刃の刃先を含むテーパー面の、軸体の軸心に対する傾斜角度が、２６．５度より大きいネジ抜取工具である。   The screw extraction tool of the present invention is a screw extraction tool for extracting a screw whose engagement groove on the screw head is crushed, and is formed on a shaft body and a tip portion of the shaft body, and is tapered toward the tip. A screw extraction part having a shape to be formed, and on the outer peripheral side of the screw extraction part, a blade provided with a cutting edge on the outer peripheral side, and spirally formed from the front end side to the rear end side of the screw extraction part 1 or more blades are formed, and the inclination angle of the tapered surface including the cutting edge of the one or more blades with respect to the axis of the shaft body is greater than 26.5 degrees.

かかる構成により、羽部の傾斜面の傾斜角度が２６度または２６．５度である一般的な十字ネジ回しを用いたことによって潰れた係合溝を有するネジを、螺旋状の刃の刃先を、潰れた係合溝の縁部に当てることによって、緩める方向に回すことができ、係合溝が潰れたネジを容易に抜き取ることができる。   With this configuration, the screw having the engagement groove that is crushed by using a general cross screwdriver in which the inclination angle of the inclined surface of the wing portion is 26 degrees or 26.5 degrees is used as the cutting edge of the spiral blade. By hitting the edge of the crushed engagement groove, it can be rotated in the loosening direction, and the screw with the crushed engagement groove can be easily pulled out.

また、本発明のネジ抜取工具は、前記ネジ抜取工具において、ネジ抜取部の外周側には、複数の刃が並列するよう形成されているネジ抜取工具である。   Moreover, the screw extraction tool of this invention is a screw extraction tool in which the said blade extraction tool is formed in the outer peripheral side of a screw extraction part so that a some blade may be paralleled.

かかる構成により、複数の刃の刃先が潰れた係合溝の縁部に当たることによって、より確実にネジを緩める方向に回して抜き取ることができる。   With such a configuration, when the cutting edges of the plurality of blades hit the edge of the smashed engagement groove, the screws can be more reliably rotated and extracted.

また、本発明のネジ抜取工具は、前記ネジ抜取工具において、ネジ抜取部の外周側には、６つの刃が並列するよう形成されているネジ抜取工具である。   Moreover, the screw extraction tool of the present invention is a screw extraction tool in which six blades are formed in parallel on the outer peripheral side of the screw extraction portion in the screw extraction tool.

かかる構成により、６つの刃の刃先が潰れた係合溝の縁部に当たることによって、より確実にネジを緩める方向に回して抜き取ることができる。   With such a configuration, when the cutting edges of the six blades hit the edges of the smashed engagement grooves, the screws can be more reliably rotated and extracted.

また、本発明のネジ抜取工具は、前記ネジ抜取工具において、螺旋状の刃の回転方向は、ネジのネジ切り方向とは逆方向であるネジ抜取工具である。   The screw extraction tool of the present invention is a screw extraction tool in which the rotational direction of the spiral blade is opposite to the screw cutting direction of the screw in the screw extraction tool.

かかる構成により、ネジをゆるむ方向に回して、ネジを抜き取ることができる。   With this configuration, the screw can be removed by turning the screw in the loosening direction.

また、本発明のネジ抜取工具は、前記ネジ抜取工具において、螺旋状の刃の後端側の側面が、テーパー面に対してなす角度が、刃の前端側の側面が、テーパー面に対してなす角度よりも大きいネジ抜取工具である。   In the screw extraction tool of the present invention, in the screw extraction tool, the angle formed by the side surface on the rear end side of the spiral blade with respect to the tapered surface is such that the side surface on the front end side of the blade is in relation to the tapered surface. It is a screw removal tool that is larger than the angle that it makes.

かかる構成により、ネジがゆるむ方向に回した際に、ネジの潰れた係合溝の縁部に刃を食い込ませやすく、あるいは引っかかりやすくして、ネジを確実に緩めることができる。   With this configuration, when the screw is rotated in the loosening direction, the blade can be easily bited into or caught by the edge of the engagement groove where the screw is crushed, and the screw can be reliably loosened.

また、本発明のネジ抜取工具は、前記ネジ抜取工具において、ネジ抜取部の先端が面であるネジ抜取工具である。   Moreover, the screw extraction tool of this invention is a screw extraction tool in which the front-end | tip of a screw extraction part is a surface in the said screw extraction tool.

かかる構成により、ネジ抜取部の先端が、ネジの潰れた係合溝の底部に当たって、刃が係合溝の縁部に当たらなくなることを防ぐことができる。   With such a configuration, it is possible to prevent the tip of the screw extraction portion from hitting the bottom of the engagement groove where the screw is crushed and the blade from coming into contact with the edge of the engagement groove.

本発明によるネジ抜取工具によれば、係合溝が潰れたネジを容易に抜き取ることができる。   According to the screw extraction tool of the present invention, it is possible to easily extract a screw whose engagement groove is crushed.

実施の形態におけるネジ抜取工具の側面図（図１（ａ））、底面図（図１（ｂ））、片側断面図（図１（ｃ））、および断面部分拡大図（図１（ｄ））Side view (FIG. 1 (a)), bottom view (FIG. 1 (b)), one-side cross-sectional view (FIG. 1 (c)), and partial cross-sectional enlarged view (FIG. 1 (d)) of the screw extraction tool in the embodiment ) ネジ抜取工具について説明するための側面図（図２（ａ）〜図２（ｄ））、およびネジの平面図（図２（ｅ）および２（ｆ））Side view (FIGS. 2 (a) to 2 (d)) for explaining the screw removal tool, and plan view of the screw (FIGS. 2 (e) and 2 (f)) ネジ抜取工具について説明するための、ネジの潰れた係合溝に、本実施の形態におけるネジ抜取工具の先端部分を押し当てた状態を示す片側断面図（図３（ａ））、および部分拡大図（図３（ｂ））One-side cross-sectional view (FIG. 3 (a)) showing a state in which the tip portion of the screw extraction tool in the present embodiment is pressed against the screw-engaged engagement groove for explaining the screw extraction tool, and a partially enlarged view Figure (Figure 3 (b))

以下、ネジ抜取工具の実施形態について図面を参照して説明する。なお、実施の形態において同じ符号を付した構成要素は同様の動作を行うので、再度の説明を省略する場合がある。   Hereinafter, an embodiment of a screw extraction tool will be described with reference to the drawings. In addition, since the component which attached | subjected the same code | symbol in embodiment performs the same operation | movement, description may be abbreviate | omitted again.

（実施の形態）
図１は、本実施の形態におけるネジ抜取工具の側面図（図１（ａ））、底面図（図１（ｂ））、片側断面図（図１（ｃ））、および図１（ｃ）の領域Ｉｃの断面部分拡大図（図１（ｄ））である。 (Embodiment)
1 is a side view (FIG. 1 (a)), a bottom view (FIG. 1 (b)), a cross-sectional side view (FIG. 1 (c)), and FIG. 1 (c) of a screw extraction tool in the present embodiment. It is a cross-section partial enlarged view (Drawing 1 (d)) of field Ic.

図２は、本実施の形態におけるネジ抜取工具の抜取対象となるネジのネジ頭部の係合溝が、十字ネジ回しで潰れる様子を説明するための側面図（図２（ａ）〜図２（ｄ））、およびネジの平面図（図２（ｅ）および２（ｆ））である。ただし、図２（ａ）に示すネジは、図２（ｅ）に示したネジの右側面を示し、図２（ｂ）および図２（ｃ）におけるネジは、図２（ｅ）に示したネジのＩＩｂ−ＩＩｂ線による断面を示し、図２（ｄ）におけるネジは、図２（ｆ）に示したネジのＩＩｄ−ＩＩｄ線による断面を示す。なお、図２（ｂ）に示した十字ネジ回しは、ここでは、図２（ａ）に示した十字ネジ回しを、軸心周りに４５度回転させた状態を示しているものとする。   FIG. 2 is a side view for explaining a state in which the engagement groove of the screw head of the screw to be extracted by the screw extraction tool according to the present embodiment is crushed by a cross screwdriver (FIGS. 2A to 2). (D)), and a top view of a screw (Drawing 2 (e) and 2 (f)). However, the screw shown in FIG. 2 (a) shows the right side surface of the screw shown in FIG. 2 (e), and the screw in FIGS. 2 (b) and 2 (c) is shown in FIG. 2 (e). A cross section taken along line IIb-IIb of the screw is shown, and a screw shown in FIG. 2D shows a cross section taken along line IId-IId of the screw shown in FIG. Here, the cross screwdriver shown in FIG. 2B shows a state in which the cross screwdriver shown in FIG. 2A is rotated 45 degrees around the axis.

図３は、本実施の形態におけるネジ抜取工具について説明するための、図２（ｄ）に示した抜取対象となるネジの潰れた係合溝に、本実施の形態におけるネジ抜取工具のネジ抜取部１０２の先端部分を押し当てた状態を示す片側断面図（図３（ａ））、および図３（ａ）の領域ＩＩＩａの部分拡大図（図３（ｂ））である。   FIG. 3 is a diagram illustrating the screw extraction tool of the present embodiment in the engagement groove in which the screw to be extracted illustrated in FIG. 2D is crushed to explain the screw extraction tool of the present embodiment. It is the one side sectional view (Drawing 3 (a)) which shows the state where the tip part of part 102 was pressed, and the elements on larger scale (Drawing 3 (b)) of field IIIa of Drawing 3 (a).

まず、ネジ３を回すための十字ネジ回しについて説明する。ネジ頭部３０２に平面形状が十字形状である係合溝３０１を備えたネジ３を回すために用いられる工具である十字ネジ回し２は、図２（ａ）および図２（ｂ）に示すように、十字ネジ回し２の軸体２０１の先端部分に、先端側から軸体２０１の軸心２０１ａ方向に見て十字型の羽部２０２が形成されている。十字型の羽部２０２の外周縁には、先端に向かうに従って、軸心側に傾斜する平面である傾斜面２０２ａが設けられており、十字側の羽部２０２は、先端側が先細りの形状を有している。十字型の羽部２０２の最も先端側の最先端部分２０２ｂは、傾斜面２０２ａよりも、軸心２０１ａに対してなす角度が大きくなるよう、軸心２０１ａ方向に傾斜しており、傾斜した面が集まる先端が尖っている。十字ネジ回し２は、十字型ドライバー等とも呼ばれる。係合溝３０１は、例えば、平面形状が十字形状である。係合溝３０１は、十字ネジ回し２の十字型の羽部２０２の先端側に嵌合する嵌合溝等であってもよい。   First, a cross screwdriver for turning the screw 3 will be described. A cross screwdriver 2, which is a tool used to turn the screw 3 having the engagement groove 301 having a cross shape in the planar shape on the screw head 302, is shown in FIGS. 2 (a) and 2 (b). In addition, a cross-shaped wing portion 202 is formed at the distal end portion of the shaft body 201 of the cross screwdriver 2 when viewed from the distal end side toward the axis 201a of the shaft body 201. On the outer peripheral edge of the cross-shaped wing portion 202, an inclined surface 202a, which is a flat surface inclined toward the axial center as it goes to the tip, is provided. The cross-side wing portion 202 has a shape with a tapered tip. doing. The most distal end portion 202b on the most distal side of the cross-shaped wing portion 202 is inclined in the direction of the axis 201a so that the angle formed with respect to the axis 201a is larger than that of the inclined surface 202a. The gathering tip is pointed. The cross screwdriver 2 is also called a cross-shaped screwdriver or the like. For example, the engaging groove 301 has a cross shape in plan view. The engagement groove 301 may be a fitting groove or the like that fits on the tip side of the cross-shaped wing 202 of the cross screwdriver 2.

一般的に広く用いられている十字ネジ回し２の傾斜面２０２ａの、軸心２０１ａに対する傾斜角度βは、２６度または２６．５度である。例えば、日本工業規格では、いわゆるＨ型のネジ回し２のこの傾斜角度βが２６．５度（公差＋０／−１度）に規定されており、いわゆるＳ型の十字ネジ回し２のこの傾斜角度βが、２６．５度（公差＋０／−１度）に規定されている。本実施の形態においては、ネジ抜取工具１が、傾斜角度βが２６．５度であるＨ型の十字ネジ回し２を用いて回したことによって係合溝３０１が潰れたネジ３を外すために用いられるものである場合を例に挙げて説明する。   The inclination angle β of the inclined surface 202a of the cross screwdriver 2 that is generally widely used with respect to the axis 201a is 26 degrees or 26.5 degrees. For example, in the Japanese Industrial Standard, the inclination angle β of the so-called H-type screwdriver 2 is defined as 26.5 degrees (tolerance + 0 / −1 degree). β is defined as 26.5 degrees (tolerance + 0 / −1 degree). In the present embodiment, in order to remove the screw 3 in which the engagement groove 301 is crushed by turning the screw extraction tool 1 using an H-shaped cross screwdriver 2 having an inclination angle β of 26.5 degrees. The case where it is used will be described as an example.

ネジ抜取工具１は、軸体１０１と、ネジ抜取部１０２とを備える。   The screw extraction tool 1 includes a shaft body 101 and a screw extraction unit 102.

ネジ抜取工具１は、ネジ頭部の係合溝が潰れたネジを抜き取るために用いられる工具である。例えば、ネジ抜取工具１は、図２（ｄ）および図２（ｆ）に示すように、ネジ頭部３０２に十字形状の係合溝３０１を有するネジ３の、この係合溝３０１が潰れた場合に、このネジ３を抜き取るために用いられる工具である。なお、ネジの係合溝は、係合孔と考えてもよい。係合溝が潰れたネジとは、例えば、係合溝の少なくとも一部が欠けたネジや、係合溝の少なくとも一部が削れたネジ、係合溝の少なくとも一部が凹んだネジ、係合溝の形状が変形したネジ等であってもよい。また、係合溝が潰れたネジは、係合溝の一部が潰れたネジであっても良く、係合溝全体が潰れたネジであっても良い。係合溝が潰れたネジは、例えば、十字ネジ回しの十字型の羽部の先端によって係合溝が潰れたネジである。   The screw extraction tool 1 is a tool used for extracting a screw whose engagement groove on the screw head is crushed. For example, as shown in FIGS. 2D and 2F, in the screw extraction tool 1, the engagement groove 301 of the screw 3 having the cross-shaped engagement groove 301 in the screw head 302 is crushed. In some cases, this is a tool used to remove the screw 3. Note that the engagement groove of the screw may be considered as an engagement hole. For example, a screw in which at least a part of the engaging groove is cut off, a screw in which at least a part of the engaging groove is cut off, a screw in which at least a part of the engaging groove is recessed, A screw or the like having a deformed groove shape may be used. Further, the screw in which the engagement groove is crushed may be a screw in which a part of the engagement groove is crushed, or may be a screw in which the entire engagement groove is crushed. The screw in which the engagement groove is crushed is, for example, a screw in which the engagement groove is crushed by the tip of the cross-shaped wing portion of a cross screwdriver.

軸体１０１は、先端と後端とを有し、先端部分にネジ抜取部１０２が形成されている。軸体１０１は、例えば、ネジ抜取部１０２以外の部分の軸方向に垂直な断面形状が正六角形である。ただし、軸体１０１のネジ抜取部１０２以外の軸方向に垂直な端面形状は、どのような形状であっても良く、例えば、円形、または四角形であってもよい。軸体１０１の後端側には、例えば、握り柄（図示せず）等が取付けられていても良い。また、軸体１０１の後端側は、インパクトドライバー、または電動ドライバー等に取付け可能な形状を有していても良い。例えば、軸体１０１の少なくとも後端側の軸方向に垂直な断面形状を、インパクトドライバー、または電動ドライバー等のチャック等に挿入取付け可能な大きさの六角形とし、後端側の軸体１０１の周囲に、抜け止め用の溝（図示せず）等を設けるようにしても良い。軸体１０１の長さおよび径等は問わない。軸体１０１の材質等は問わない。例えば、軸体１０１の材質等としては、ネジ抜取工具１で抜き取ろうとするネジよりも硬い材質であることが好ましい。軸体１０１の材質としては、例えば、クロムバナジウム鋼、クロムモリブデン鋼等の合金鋼や、高炭素鋼、ステンレス鋼等の鋼材が用いられる。   The shaft body 101 has a front end and a rear end, and a screw extraction portion 102 is formed at the front end portion. For example, the shaft body 101 has a regular hexagonal cross-sectional shape perpendicular to the axial direction of the portion other than the screw extraction portion 102. However, the shape of the end surface perpendicular to the axial direction other than the screw extraction portion 102 of the shaft body 101 may be any shape, for example, a circle or a rectangle. For example, a grip handle (not shown) or the like may be attached to the rear end side of the shaft body 101. Further, the rear end side of the shaft body 101 may have a shape that can be attached to an impact driver or an electric screwdriver. For example, a cross-sectional shape perpendicular to the axial direction of at least the rear end side of the shaft body 101 is a hexagonal shape that can be inserted and attached to a chuck such as an impact driver or an electric screwdriver, and the shaft body 101 on the rear end side A retaining groove (not shown) or the like may be provided around the periphery. The length and diameter of the shaft body 101 are not limited. The material of the shaft body 101 does not matter. For example, the material of the shaft body 101 is preferably a material harder than the screw to be extracted by the screw extraction tool 1. As a material of the shaft body 101, for example, alloy steel such as chrome vanadium steel and chrome molybdenum steel, or steel materials such as high carbon steel and stainless steel are used.

ネジ抜取部１０２は、軸体１０１の先端部分に形成されている。ネジ抜取部１０２は、軸体１０１の先端に向かって先細りとなる形状を有している。ネジ抜取部１０２の外周側は、例えば、軸体１０１の軸心１０１ａ側にテーパー状に傾斜している。先端に向かって先細りの形状とは、例えば、先端に向かって径が縮小していく形状である。なお、ネジ抜取部１０２の最も太い部分（通常は後端側）の径は、抜取対象のネジ３の潰れた係合溝３０１ａの径よりも大きい径とすることが好ましく、最も細い部分（通常は先端側）の径は、潰れた係合溝３０１ａの径よりも小さい径とすることが好ましい。   The screw extraction portion 102 is formed at the tip portion of the shaft body 101. The screw extraction unit 102 has a shape that tapers toward the tip of the shaft body 101. For example, the outer peripheral side of the screw extraction part 102 is inclined in a tapered shape toward the shaft center 101 a side of the shaft body 101. The tapered shape toward the tip is, for example, a shape whose diameter decreases toward the tip. The diameter of the thickest part (usually the rear end side) of the screw extraction part 102 is preferably larger than the diameter of the crushed engagement groove 301a of the screw 3 to be extracted, and the thinnest part (normally normal) Is preferably smaller than the diameter of the crushed engagement groove 301a.

ネジ抜取部１０２の外周側には、ネジ抜取部１０２の先端側から後端側に向かって螺旋状に伸びる６つの刃１０４が形成されている。刃１０４は、刃先１０４ａがネジ抜取部１０２の外周側に設けられた刃である。６つの刃は、並列するよう形成されている。具体的には、６つの刃は並列して螺旋状に伸びている。６つの刃は、予め決められた間隔を隔てて隣接して形成されている。なお、６つの刃１０４間の間隔や、刃先１０４ａの間隔は、刃１０４の伸びる方向において通常は一定であるが、一定でなくても良い。螺旋状の刃１０４は、例えば、ネジ抜取部１０２の外周側に巻付けられるように形成されている。ここでは、ネジ抜取部１０２の外周側に形成されている刃１０４のそれぞれが、略一巻きの螺旋状の刃１０４である場合について示している。   On the outer peripheral side of the screw extraction portion 102, six blades 104 that spirally extend from the front end side to the rear end side of the screw extraction portion 102 are formed. The blade 104 is a blade in which the blade edge 104 a is provided on the outer peripheral side of the screw extraction unit 102. The six blades are formed in parallel. Specifically, the six blades extend in a spiral in parallel. The six blades are formed adjacent to each other at a predetermined interval. In addition, although the space | interval between the six blades 104 and the space | interval of the blade edge | tip 104a are normally constant in the direction where the blade 104 is extended, it does not need to be constant. The spiral blade 104 is formed, for example, so as to be wound around the outer peripheral side of the screw extraction portion 102. Here, a case is shown in which each of the blades 104 formed on the outer peripheral side of the screw extraction portion 102 is a substantially one-turn spiral blade 104.

ネジ抜取部１０２の外周側の刃１０４に挟まれた部分には、溝１０３が形成されている。ここでは６つの刃１０４が形成されているため、６つの溝１０３が形成されている。溝１０３は、隣接する刃１０４に沿って先端側から後端側に向かって螺旋状に伸びている。溝１０３は、通常一定の幅および深さを有しているが、幅および深さは一定でなくても良い。溝１０３の断面形状は問わない。例えば溝１０３の断面形状はＵ字形状やＶ字形状である。   A groove 103 is formed in a portion sandwiched between the blades 104 on the outer peripheral side of the screw extraction portion 102. Here, since six blades 104 are formed, six grooves 103 are formed. The groove 103 extends spirally along the adjacent blade 104 from the front end side toward the rear end side. The groove 103 usually has a constant width and depth, but the width and depth may not be constant. The cross-sectional shape of the groove 103 is not limited. For example, the cross-sectional shape of the groove 103 is U-shaped or V-shaped.

螺旋状の刃１０４のネジ抜取部１０２の先端に向かう螺旋の回転方向は、ネジ抜取工具１の抜取り対象となるネジ３の螺旋状のネジ溝のネジ３の先端に向かう螺旋の回転方向とは逆方向とする。例えば、螺旋状の刃１０４は、ネジ抜取工具１の抜取り対象となるネジ３に対していわゆる逆ネジを切った形状を有するものとなっている。本実施の形態においては、抜取対象となるネジがいわゆる右ネジであり、ネジ抜取部１０２に形成された螺旋状の刃１０４の、ネジ抜取部１０２の先端に向かう螺旋の回転方向が、抜取り対象となる右ネジの先端に向かうネジ溝の螺旋の回転方向とは逆方向、すなわち左回りである場合を例に挙げて示している。なお、抜取り対象となるネジが、左ネジである場合、螺旋状の溝１０３の先端に向かう螺旋の回転方向は、左ネジの先端に向かうネジ溝の螺旋の回転方向とは逆方向、すなわち右回りとすればよい。ここでの刃１０４の先端に向かう方向とは、例えば、刃１０４の、ネジ抜取部１０２の先端に向かう方向である。また、ここでのネジの先端に向かう方向とは、ネジの、ネジ頭部から、ネジの先端、すなわちネジ頭部とは反対側の端部に向かう方向である。なお、螺旋状の刃１０４の、ネジ抜取部１０２の先端に向かう螺旋の回転方向が、ネジ抜取工具１の抜取り対象となるネジ３の螺旋状のネジ溝のネジ３の先端に向かう螺旋の回転方向とは逆方向であるということは、螺旋状の刃１０４を軸体１０１の先端側から後端側に向かって見た場合の螺旋の回転方向が、ネジ３のネジ溝をネジ３の先端側からネジ頭部３０２側に向かって見た場合の螺旋の回転方向に対して逆方向であることと考えてもよい。   The rotation direction of the spiral toward the tip of the screw extraction portion 102 of the spiral blade 104 is the rotation direction of the spiral toward the tip of the screw 3 in the spiral thread groove of the screw 3 to be extracted by the screw extraction tool 1. The reverse direction. For example, the spiral blade 104 has a shape in which a so-called reverse screw is cut with respect to the screw 3 to be extracted by the screw extraction tool 1. In the present embodiment, the screw to be extracted is a so-called right screw, and the spiral rotation direction of the spiral blade 104 formed on the screw extraction unit 102 toward the tip of the screw extraction unit 102 is the extraction target. An example is shown in which the direction of rotation of the spiral of the thread groove toward the tip of the right screw is opposite, that is, counterclockwise. When the screw to be extracted is a left screw, the rotation direction of the spiral toward the tip of the spiral groove 103 is opposite to the rotation direction of the spiral of the screw groove toward the tip of the left screw, that is, right Just go around. Here, the direction toward the tip of the blade 104 is, for example, the direction toward the tip of the screw extraction unit 102 of the blade 104. The direction toward the tip of the screw here is the direction from the screw head to the tip of the screw, that is, the end opposite to the screw head. In addition, the rotation direction of the spiral of the spiral blade 104 toward the tip of the screw extraction unit 102 is the rotation of the spiral toward the tip of the screw 3 of the spiral screw groove of the screw 3 to be extracted by the screw extraction tool 1. When the spiral blade 104 is viewed from the front end side to the rear end side of the shaft body 101, the rotation direction of the spiral is the screw groove of the screw 3 and the tip of the screw 3. It may be considered that the direction is opposite to the direction of rotation of the spiral when viewed from the side toward the screw head 302 side.

６つの刃１０４は、刃先１０４ａが一のテーパー面１０５に含まれるように形成されている。このテーパー面１０５は、仮想のテーパー面である。このテーパー面１０５は、軸体１０１の軸心１０１ａを含む平面と交わる交線が、直線となる面である。このテーパー面１０５は、ネジ抜取部１０２の後端を底面とし、ネジ抜取部１０２の後端から先端に向かう方向を高さ方向とし、軸体１０１の軸心１０１ａを回転軸とした円錐台の側面と同じ形状を有している。このテーパー面１０５は、例えば、ネジ抜取部１０２が先端側に向かって先細りとなるよう軸体１０１の軸心１０１ａ側に傾斜しているテーパー面１０５である。複数の刃１０４は、刃先１０４ａが、例えば、軸体１０１の軸心１０１ａに交わる直線に同時に接するように形成されている。なお、複数の刃１０４は、刃先１０４ａの全ての部分が同一のテーパー面１０５に含まれるよう形成することが好ましいが、その一部は、他の部分と同一のテーパー面１０５に含まれていなくてもよい。同一のテーパー面に接しない部分は、例えば、ネジ抜取部１０２の先端側近傍や、ネジ抜取部１０２の後端側近傍、刃先１０４ａの１以上の箇所に局在する刃１０４の伸びる方向の長さが約２ｍｍ未満の微少な部分等である。先端側近傍とは、例えば、軸心１０１ａ方向において、先端から後端方向に約２ｍｍ未満の位置であり、後端側近傍とは、軸心１０１ａ方向において、後端から先端方向に約２ｍｍ未満の位置である。ネジ抜取部１０２の先端側近傍と後端側近傍の刃先１０４ａは、潰れた係合溝３０１ａに接しない場合が多いと考えられるからである。なお、ここで挙げた微少な部分や、先端側近傍や、後端側近傍を示す数値は、一例であり、実際の数値は、ここで挙げた数値よりも大きくても良く、小さくても良い。   The six blades 104 are formed such that the blade edge 104 a is included in one tapered surface 105. The tapered surface 105 is a virtual tapered surface. The tapered surface 105 is a surface in which an intersecting line intersecting a plane including the axis 101a of the shaft body 101 is a straight line. The tapered surface 105 is a truncated cone having a rear end of the screw extraction portion 102 as a bottom surface, a direction from the rear end to the tip of the screw extraction portion 102 as a height direction, and an axis 101a of the shaft body 101 as a rotation axis. It has the same shape as the side. The tapered surface 105 is, for example, a tapered surface 105 that is inclined toward the axial center 101a of the shaft body 101 so that the screw extraction portion 102 is tapered toward the distal end side. The plurality of blades 104 are formed such that the blade tips 104a are simultaneously in contact with a straight line that intersects the shaft center 101a of the shaft body 101, for example. The plurality of blades 104 are preferably formed so that all portions of the blade edge 104a are included in the same tapered surface 105, but some of them are not included in the same tapered surface 105 as the other portions. May be. The portion not in contact with the same tapered surface is, for example, the length in the extending direction of the blade 104 located in the vicinity of the front end side of the screw extraction portion 102, the rear end side of the screw extraction portion 102, or one or more locations of the blade edge 104a. Is a minute part with a length of less than about 2 mm. The vicinity of the front end side is, for example, a position less than about 2 mm from the front end to the rear end direction in the direction of the axis 101a, and the vicinity of the rear end side is less than about 2 mm from the rear end to the front end direction in the direction of the axis 101a. Is the position. This is because it is considered that the cutting edges 104a in the vicinity of the front end side and the rear end side of the screw extraction portion 102 do not often come into contact with the crushed engagement groove 301a. Note that the numerical values shown here, the numerical values indicating the vicinity of the front end side and the vicinity of the rear end side are examples, and the actual numerical values may be larger or smaller than the numerical values listed here. .

本実施の形態においては、ネジ抜取部１０２の６つの刃１０４の刃先１０４ａを含むテーパー面１０５の、軸体１０１の軸心１０１ａに対する傾斜角度αが、一般的な十字ネジ回し２の傾斜面２０２ａの傾斜角度βである２６．５度より大きい角度となるようにしている。このことは、例えば、ネジ抜取部１０２の６つの刃が、その刃先１０４ａを含むテーパー面１０５の、軸心１０１ａに対する傾斜角度αが、２６．５度より大きい角度となるようにネジ抜取部１０２の外周側に形成されていることと考えてもよい。６つの刃１０４の刃先１０４ａを含むテーパー面１０５の軸心１０１ａに対する傾斜角度αは、例えば、６つの刃１０４の刃先１０４ａを含むテーパー面１０５と軸心１０１ａとが交わる交線である直線が、軸心１０１ａに対してなす角度である。この傾斜角度αは、例えば、軸体１０１の軸心１０１ａを回転軸とした円錐台の側面と同じ形状を有するテーパー面１０５の稜線が、軸心１０１ａに対してなす角度と考えてもよい。この傾斜角度αは、例えば、軸心１０１ａを通るとともに螺旋状の６つの刃１０４の刃先１０４ａに接する直線と、軸心１０１ａとがなす角度と考えてもよい。   In the present embodiment, the inclination angle α of the taper surface 105 including the cutting edges 104a of the six blades 104 of the screw extraction portion 102 with respect to the axis 101a of the shaft body 101 is equal to the inclined surface 202a of the general cross screwdriver 2. The inclination angle β is larger than 26.5 degrees. This is because, for example, the six blades of the screw extraction unit 102 have the screw extraction unit 102 so that the inclination angle α of the tapered surface 105 including the cutting edge 104a with respect to the axis 101a is larger than 26.5 degrees. It may be considered that it is formed on the outer peripheral side of the. The inclination angle α of the tapered surface 105 including the cutting edge 104a of the six blades 104 with respect to the axis 101a is, for example, a straight line that is an intersection line between the tapered surface 105 including the cutting edge 104a of the six blades 104 and the axis 101a. This is an angle formed with respect to the axis 101a. The inclination angle α may be considered as an angle formed by the ridge line of the tapered surface 105 having the same shape as the side surface of the truncated cone having the axis 101a of the shaft body 101 as the rotation axis, with respect to the axis 101a. The inclination angle α may be considered as, for example, an angle formed between the axis 101a and a straight line passing through the axis 101a and in contact with the blade tips 104a of the six spiral blades 104.

各刃１０４は、例えば、ネジ抜取工具１で抜き取ろうとするネジ３を、締める方向とは逆方向、すなわち緩める方向に軸体１０１を回転させた場合に、この刃１０４に当接されるものを切削可能な形状を有しているように形成することが好ましい。切削可能な形状とすることで、例えば、ネジ抜取工具１で抜き取ろうとするネジ３を緩める方向に軸体１０１を回転させた場合に、刃１０４がネジ３のネジ頭部３０２の潰れた係合溝３０１の開口部３０１１の縁部３０１１ａ等に食い込みやすくしたり、引っかかりやすくして、ネジをゆるむ方向に回しやすくなる。なお、潰れた係合溝３０１の開口部３０１１の縁部３０１１ａを、潰れた係合溝３０１の縁部３０１１ａと呼ぶ場合がある。   Each blade 104 comes into contact with the blade 104 when the shaft body 101 is rotated in the direction opposite to the direction in which the screw 3 to be extracted by the screw extraction tool 1 is tightened, that is, in the loosening direction. Is preferably formed so as to have a shape that can be cut. With the shape that can be cut, for example, when the shaft body 101 is rotated in the direction of loosening the screw 3 to be extracted by the screw extraction tool 1, the blade 104 is crushed in the screw head 302 of the screw 3. It becomes easy to bite into the edge portion 3011a of the opening 3011 of the joint groove 301 or the like, and it is easy to be caught, so that the screw can be easily turned in the loosening direction. Note that the edge 3011a of the opening 3011 of the crushed engagement groove 301 may be referred to as the edge 3011a of the crushed engagement groove 301.

ここでは、図１（ｄ）に示すように、螺旋状の刃１０４の刃先１０４ａの後端側の側面１０４２がネジ抜取部１０２のテーパー面１０５に対してなす角度Ｒｂが、刃１０４の刃先１０４ａの前端側の側面１０４１がネジ抜取部１０２のテーパー面１０５に対してなす角度Ｒｆよりも大きくなるようにしている。これにより、刃先１０４が軸体１０１の後方側に傾斜することとなり、例えば、ネジ抜取工具１で抜き取ろうとするネジ３を緩める方向に軸体１０１を回転させた場合に、刃１０４の刃先１０４ａがネジ頭部３０２の潰れた係合溝３０１ａの縁部３０１１ａ等に食い込みやすく、あるいは引っかかりやすくなり、ネジ３をゆるむ方向に回しやすくなる。ここでの刃先１０４の側面とは、例えば、刃先１０４ａ近傍の側面である。刃先１０４が軸体１０１の後方側に傾斜するということは、例えば、刃１０４が、根元側から刃先１０４に向かって後方側に傾斜していることと考えても良い。ここでの前端側および後端側は、例えば、軸体１０１の前端側および後端側と考えてよい。ここでの、螺旋状の刃１０４の刃先１０４ａの側面が、テーパー面１０５に対してなす角度Ｒｆ、Ｒｂとは、例えば、軸心１０１ａを含む断面におけるテーパー面１０５に対する刃１０４の刃先１０４ａの側面のなす角度である。なお、刃１０４の後端側の側面１０４２は、溝１０３の前端側の側面と考えてもよい。また、刃１０４の前端側の側面１０４１は溝１０３の後端側の側面と考えてもよい。なお、刃１０４の刃先１０４ａの後端側の側面１０４２がネジ抜取部１０２のテーパー面１０５に対してなす角度Ｒｂが、刃１０４の刃先１０４ａの前端側の側面１０４１がネジ抜取部１０２のテーパー面１０５に対してなす角度Ｒｆよりも大きいということは、刃１０４の断面における刃先１０４ａの二等分線の、刃先１０４ａ側が、軸心１０１ａ側よりも、軸心１０１ａ方向において後方側に位置することと考えても良く、この二等分線が、軸心１０１ａ側から、刃先１０４ａに向かって伸びる方向、言い換えれば外周方向に向かう方向が、軸体１０１の後方側に向かって傾斜していることと考えてもよい。刃の刃先１０４ａの二等分線は、例えば、刃１０４の刃先１０４ａの前端側の側面１０４１と、刃１０４の刃先１０４ａの後端側の側面１０４２とがなす角度の二等分線である。ただし、角度Ｒｂが、角度Ｒｆ以下となるようにしてもよい。   Here, as shown in FIG. 1D, the angle Rb formed by the side surface 1042 on the rear end side of the blade edge 104 a of the spiral blade 104 with respect to the taper surface 105 of the screw extraction portion 102 is equal to the blade edge 104 a of the blade 104. The front end side surface 1041 is set to be larger than an angle Rf formed with respect to the tapered surface 105 of the screw extraction portion 102. As a result, the blade edge 104 is inclined to the rear side of the shaft body 101. For example, when the shaft body 101 is rotated in the direction of loosening the screw 3 to be extracted by the screw extraction tool 1, the blade edge 104a of the blade 104 is rotated. However, it is easy to bite or get caught in the edge 3011a of the engagement groove 301a of the screw head 302 that is crushed, and the screw 3 is easily turned in the loosening direction. The side surface of the blade edge 104 here is, for example, the side surface in the vicinity of the blade edge 104a. The fact that the blade edge 104 is inclined toward the rear side of the shaft body 101 may be considered, for example, that the blade 104 is inclined rearward from the root side toward the blade edge 104. Here, the front end side and the rear end side may be considered as the front end side and the rear end side of the shaft body 101, for example. Here, the angles Rf and Rb formed by the side surface of the blade edge 104a of the spiral blade 104 with respect to the tapered surface 105 are, for example, the side surface of the blade edge 104a of the blade 104 with respect to the tapered surface 105 in the cross section including the axis 101a. This is the angle formed by The side surface 1042 on the rear end side of the blade 104 may be considered as the side surface on the front end side of the groove 103. Further, the side surface 1041 on the front end side of the blade 104 may be considered as the side surface on the rear end side of the groove 103. Note that the angle Rb formed by the side surface 1042 on the rear end side of the blade edge 104a of the blade 104 with respect to the taper surface 105 of the screw extraction portion 102 is such that the side surface 1041 on the front end side of the blade edge 104a of the blade 104 is the taper surface of the screw extraction portion 102. Is larger than the angle Rf formed with respect to 105 is that the bisector of the blade edge 104a in the cross section of the blade 104 is located on the rear side in the direction of the axis 101a rather than the axis center 101a side. The direction in which the bisector extends from the axis 101a side toward the cutting edge 104a, in other words, the direction toward the outer peripheral direction, is inclined toward the rear side of the shaft body 101. You may think. The bisector of the blade edge 104a of the blade is, for example, a bisector of an angle formed by the side surface 1041 on the front end side of the blade edge 104a of the blade 104 and the side surface 1042 on the rear end side of the blade edge 104a of the blade 104. However, the angle Rb may be equal to or less than the angle Rf.

また、ここでは、刃１０４の刃先１０４ａの断面の角度を鋭角としている。これにより、刃１０４は、例えば、ネジ抜取工具１で抜き取ろうとするネジ３を緩める方向に軸体１０１を回転させた場合に、この刃１０４の刃先１０４ａが、この刃先１０４ａに当接されるネジ頭部３０２の潰れた係合溝３０１ａの縁部３０１１ａ等に食い込みやすくなり、軸体１０１に加えた回転方向の力を、ネジに効率良く伝えることができる。なお、刃先１０４ａの断面の角度とは、刃１０４の伸びる方向に垂直な断面における刃先１０４ａの角度、具体的には刃先１０４の近傍における刃１０４の前端側の側面１０４１と後端側の側面１０４２とがなす角度である。ただし、刃１０４の刃先１０４ａの断面の角度は鋭角でなくてもよく、例えば、９０度であっても良く、鈍角であってもよい。   Here, the angle of the cross section of the blade edge 104a of the blade 104 is an acute angle. Thereby, for example, when the shaft body 101 is rotated in the direction of loosening the screw 3 to be extracted with the screw extraction tool 1, the blade edge 104a of the blade 104 comes into contact with the blade edge 104a. It becomes easy to bite into the edge portion 3011a of the engagement groove 301a that has been crushed in the screw head 302, and the rotational force applied to the shaft body 101 can be efficiently transmitted to the screw. The angle of the cross section of the blade edge 104a is the angle of the blade edge 104a in the cross section perpendicular to the extending direction of the blade 104, specifically, the side surface 1041 on the front end side and the side surface 1042 on the rear end side of the blade 104 in the vicinity of the blade edge 104. Is the angle between However, the angle of the cross section of the blade edge 104a of the blade 104 may not be an acute angle, for example, 90 degrees or an obtuse angle.

なお、刃１０４は、断面が角である突端を有する凸条であって、この突端が、一のテーパー面１０５に含まれる凸条と考えてもよい。ここでの断面は、凸条の伸びる方向に垂直な断面である。この凸条は外周方向に凸となる線条と考えてもよい。また、この突端が刃先１０４ａに相当すると考えても良い。   Note that the blade 104 may be a protruding line having a protruding end having a corner in cross section, and the protruding end may be considered as a protruding line included in one tapered surface 105. The cross section here is a cross section perpendicular to the direction in which the ridges extend. This protruding line may be considered as a line protruding in the outer circumferential direction. Moreover, you may think that this protrusion corresponds to the blade edge 104a.

ここでは、ネジ抜取部１０２の先端には面１０６が形成されており、ネジ抜取部１０２の先端が尖鋭とならないようにしている。これにより、ネジ抜取部１０２を潰れた係合溝３０１に押し当てた際に、ネジ抜取部１０２の外周側に設けられた刃１０４が、係合溝３０１の縁部３０１１ａに当たる前に、ネジ抜取部１０２の先端がネジの係合溝３０１の底部に当たらないようにしている。なお、先端の面は、通常は平面であるが、凹面や凸面等の曲面であっても良い。また、ネジ抜取部１０２の先端は、ネジ抜取部１０２を潰れた係合溝３０１に押し当てた際に、ネジ抜取部１０２の外周側に設けられた刃１０４が、係合溝３０１の縁部３０１３に当たる前に、ネジ抜取部１０２の先端がネジの係合溝３０１の底部３０１１ｂに当たらないようにすることが可能な形状であれば、どのような形状であってもよい。   Here, a surface 106 is formed at the tip of the screw extraction portion 102 so that the tip of the screw extraction portion 102 does not become sharp. As a result, when the screw extraction portion 102 is pressed against the crushed engagement groove 301, the blade 104 provided on the outer peripheral side of the screw extraction portion 102 is removed before the contact with the edge 3011 a of the engagement groove 301. The tip of the portion 102 is prevented from hitting the bottom of the engagement groove 301 of the screw. The tip surface is usually a flat surface, but may be a curved surface such as a concave surface or a convex surface. Further, when the tip of the screw extraction portion 102 is pressed against the smashed engagement groove 301, the blade 104 provided on the outer peripheral side of the screw extraction portion 102 has an edge portion of the engagement groove 301. Any shape may be used as long as it can prevent the tip of the screw extraction portion 102 from hitting the bottom portion 3011b of the engagement groove 301 of the screw before hitting 3013.

次に、ネジ抜取工具１の製造方法の一例について説明する。
まず、軸体１０１の先端部分に、先端に向かって先細りとなるよう、軸心側に傾斜している外周面を形成する。例えば、軸体１０１として用いられる六角柱形状の棒状材料（図示せず）を用意し、この棒状材料を工作機械（図示せず）等を用いて軸心周りに回転させ、棒状材料の先端部分を切削用の切刃（図示せず）等を用いて先端側が先細りとなり、外周面が軸心側に傾斜するよう切削して、先端部分にテーパー状の外周面を形成する。このとき、この外周面と、軸体１０１の軸心１０１ａを通る平面との交線が直線となるようにする。また、軸体１０１の軸心１０１ａに対する外周面の傾斜角度が、２６．５度より大きい角度となるよう外周面を形成する。この外周面が形成された部分がネジ抜取部１０２となる。 Next, an example of the manufacturing method of the screw extraction tool 1 will be described.
First, the outer peripheral surface which inclines to the axial center side is formed in the front-end | tip part of the shaft body 101 so that it may taper toward the front-end | tip. For example, a hexagonal column-shaped rod-shaped material (not shown) used as the shaft body 101 is prepared, and this rod-shaped material is rotated around the axis using a machine tool (not shown) or the like, so that the tip portion of the rod-shaped material Is cut using a cutting blade (not shown) or the like so that the tip end is tapered and the outer peripheral surface is inclined toward the axial center, thereby forming a tapered outer peripheral surface at the tip portion. At this time, an intersection line between the outer peripheral surface and a plane passing through the axis 101a of the shaft body 101 is set to be a straight line. Further, the outer peripheral surface is formed so that the inclination angle of the outer peripheral surface with respect to the shaft center 101a of the shaft body 101 is larger than 26.5 degrees. The portion where the outer peripheral surface is formed becomes the screw extraction portion 102.

そして、この外周面に、ネジ抜取部１０２の先端側から後端側に向かって螺旋状に伸びる６本の溝１０３を隣接するよう形成して、外周面の複数の溝に挟まれた部分が刃先１０４ａとなる刃１０４を複数の溝１０３の間に形成する。例えば、軸体１０１を回転させ、溝切削用の切刃（図示せず）をネジ抜取部１０２の先端から後端側に相対的に移動させながらネジ抜取部１０２のテーパー状の外周面を切削して、６本の螺旋状の溝１０３をネジ抜取部１０２の外周面に刻設する。このとき、隣接する溝１０３間にネジ抜取部１０２のテーパー状の外周面が線状に残るよう各溝１０３を刻設することで、外周面に刃先１０４ａを有する刃１０４が隣接する溝１０３間に形成される。溝１０３の側面の傾斜角度や溝の深さ等は、溝切削用の切刃の形状や、切刃をネジ抜取部１０２の外周面に当てる角度等によって決定される。   Then, on this outer peripheral surface, six grooves 103 extending spirally from the front end side to the rear end side of the screw extraction portion 102 are formed so as to be adjacent to each other, and a portion sandwiched between the plurality of grooves on the outer peripheral surface is formed. A blade 104 to be the blade edge 104 a is formed between the plurality of grooves 103. For example, the tapered outer peripheral surface of the screw extraction part 102 is cut while rotating the shaft body 101 and relatively moving a cutting edge (not shown) for groove cutting from the front end of the screw extraction part 102 to the rear end side. Then, six spiral grooves 103 are formed on the outer peripheral surface of the screw extraction portion 102. At this time, by engraving each groove 103 so that the tapered outer peripheral surface of the screw extraction portion 102 remains linearly between the adjacent grooves 103, the blade 104 having the blade edge 104a on the outer peripheral surface is between the adjacent grooves 103. Formed. The inclination angle of the side surface of the groove 103, the depth of the groove, and the like are determined by the shape of the cutting edge for groove cutting, the angle at which the cutting edge is applied to the outer peripheral surface of the screw extraction portion 102, and the like.

なお、ここでの、軸体１０１の先端部分に形成した外周面は、上述したテーパー面１０５に相当するものであり、この外周面を、例えば、テーパー面１０５と考えてもよい。例えば、この外周面は、ネジ抜取部１０２の径が先端に向かう方向の距離に比例して縮小するように、テーパー状に傾斜している面である。また、ここでの刃先１０４ａは、外周面のうちの、隣接する螺旋状の溝の間に残された部分である。また、ここでの軸体１０１の軸心１０１ａに対する外周面の傾斜角度は、上述したテーパー面１０５の、軸体１０１の軸心１０１ａに対する傾斜角度に相当するものであり、軸心１０１ａを含む平面と外周面との交線である直線と、軸心１０１ａとがなす角度と考えてもよい。   Here, the outer peripheral surface formed at the tip of the shaft body 101 corresponds to the tapered surface 105 described above, and this outer peripheral surface may be considered as the tapered surface 105, for example. For example, the outer peripheral surface is a surface inclined in a tapered shape so that the diameter of the screw extraction portion 102 decreases in proportion to the distance in the direction toward the tip. The cutting edge 104a here is a portion of the outer peripheral surface left between adjacent spiral grooves. The inclination angle of the outer peripheral surface of the shaft body 101 with respect to the shaft center 101a here corresponds to the inclination angle of the tapered surface 105 with respect to the shaft center 101a of the shaft body 101, and is a plane including the shaft center 101a. It may be considered as an angle formed by a straight line that is a line of intersection between the outer peripheral surface and the axis 101a.

なお、上記のように製造されることから、本実施の形態のネジ抜取工具１は、ネジ頭部３０２の係合溝３０１が潰れたネジを抜き取るためのネジ抜取工具１であって、軸体１０１と、軸体１０１の先端部分に形成されており、先端に向かって先細りとなるよう、外周面が軸心側に傾斜しているネジ抜取部１０２と、を備え、ネジ抜取部１０２の外周面には、ネジ抜取部１０２の先端側から後端側に向かって螺旋状に伸びる１以上の溝１０３、例えば６つの溝１０３が隣接するよう形成されており、溝１０３の間には、ネジ抜取部１０２の外周面の溝１０３に挟まれた部分が刃先１０４ａとなる刃１０４が形成されており、軸体１０１の軸心１０１ａに対するネジ抜取部１０２の外周面の傾斜角度が、２６．５度より大きいネジ抜取工具１と考えてもよい。   In addition, since it manufactures as mentioned above, the screw extraction tool 1 of this Embodiment is the screw extraction tool 1 for extracting the screw with which the engaging groove 301 of the screw head 302 was crushed, Comprising: 101 and a screw extraction portion 102 that is formed at the distal end portion of the shaft body 101 and has an outer peripheral surface inclined toward the axial center so as to be tapered toward the distal end. One or more grooves 103 extending in a spiral shape from the front end side to the rear end side of the screw extraction portion 102, for example, six grooves 103 are adjacent to each other on the surface. A blade 104 is formed in which a portion sandwiched between the grooves 103 on the outer peripheral surface of the extraction portion 102 is a blade edge 104a, and the inclination angle of the outer peripheral surface of the screw extraction portion 102 with respect to the shaft center 101a of the shaft body 101 is 26.5. Screw removal tool 1 larger than It may be.

次に、ネジ抜取工具１を用いたネジの抜取方法等について具体例を挙げて説明する。ここで用いられるネジ３は、ネジ頭部３０２方向から見て時計回り（右回り）に回したときに、先端方向に進む右ネジであるとする。また、ここで用いられるネジ抜取工具１の傾斜角度αは２７度であるとする。   Next, a screw extraction method using the screw extraction tool 1 will be described with a specific example. It is assumed that the screw 3 used here is a right screw that advances in the tip direction when rotated clockwise (clockwise) when viewed from the screw head 302 direction. Further, it is assumed that the inclination angle α of the screw extraction tool 1 used here is 27 degrees.

ある部材にねじ込まれた図２（ｅ）に示すようなネジ頭部３０２に十字型の係合溝３０１が設けられたネジ３を取り外すため、または、ある部材にネジ３をねじ込むために、図２（ａ）および図２（ｂ）に示すように、ネジ３の十字形状の係合溝３０１に、傾斜角度βが２６．５度である十字ネジ回し２の羽部２０２の先端側を嵌め込み、図２（ｃ）に示すように、十字ネジ回し２を回したとする。このとき、十字ネジ回し２の羽部２０２によってネジ３の係合溝３０１が潰れてしまったとする。係合溝３０１が潰れた状態のネジ３の軸心３００に沿った断面は、図２（ｄ）のようになり、ネジ頭部３０２の平面図は、図２（ｆ）のようになる。潰れた係合溝３０１ａは、先端側を嵌めた十字型の羽部２０２を軸心２０１ａを中心として回転させたことによって、係合溝３０１が潰れて形成されたものであることから、潰れた係合溝３０１ａの開口部３０１１の平面形状は、例えば、略円形となり、潰れた係合溝３０１ａの開口部３０１１側の内側面３０１２がネジ３の軸心３００に対してなす角度は、傾斜角度βと略同じ角度、すなわち略２６．５度となったとする。なお、潰れた係合溝３０１ａの開口部３０１１側の内側面３０１２がネジ３の軸心３００に対してなす角度とは、ネジ３の軸心３００を含む平面と係合溝３０１ａの内側面３０１２とが交わる交線が、ネジ３の軸心３００に対してなす角度である。なお、内側面３０１２は、軸心３００周りを回転する羽部２０２の傾斜面２０２ａで削られた面であり、傾斜面２０２ａは平面であることから、上記の交線は、直線となる。   In order to remove the screw 3 provided with the cross-shaped engaging groove 301 in the screw head 302 as shown in FIG. 2E screwed into a certain member or to screw the screw 3 into a certain member. 2 (a) and FIG. 2 (b), the tip side of the wing portion 202 of the cross screwdriver 2 having an inclination angle β of 26.5 degrees is fitted into the cross-shaped engagement groove 301 of the screw 3. Suppose that the cross screwdriver 2 is turned as shown in FIG. At this time, it is assumed that the engagement groove 301 of the screw 3 is crushed by the wing portion 202 of the cross screwdriver 2. The cross section along the axis 300 of the screw 3 in a state where the engagement groove 301 is crushed is as shown in FIG. 2D, and the plan view of the screw head 302 is as shown in FIG. The crushed engaging groove 301a is crushed because the engaging groove 301 is crushed by rotating the cruciform wing 202 fitted with the tip side around the axis 201a. The planar shape of the opening 3011 of the engagement groove 301a is, for example, substantially circular, and the angle formed by the inner surface 3012 on the opening 3011 side of the crushed engagement groove 301a with respect to the axis 300 of the screw 3 is an inclination angle. Assume that the angle is substantially the same as β, that is, approximately 26.5 degrees. The angle formed by the inner surface 3012 on the opening 3011 side of the crushed engagement groove 301a with respect to the axis 300 of the screw 3 is the plane including the axis 300 of the screw 3 and the inner surface 3012 of the engagement groove 301a. Is an angle formed with respect to the axis 300 of the screw 3. The inner side surface 3012 is a surface cut by the inclined surface 202a of the wing portion 202 that rotates around the axis 300. Since the inclined surface 202a is a flat surface, the above-mentioned intersection line is a straight line.

上記のような潰れた係合溝３０１ａを有するネジ３をある部材から抜き取るために、ネジ抜取工具１を、図３（ａ）に示すように、ネジ３の潰れた係合溝３０１ａ内に、ネジ抜取部１０２の先端側を押し込むように挿入して、軸体１０１をネジ３を嵌め込む際に回す方向とは逆方向である左方向に回転させる。ネジ抜取工具１を係合溝３０１ａに挿入する際には、軸体１０１の軸心１０１ａと、ネジ３の軸心３００とが略同一直線上に位置するように挿入することが好ましい。ネジ抜取工具１のネジ抜取部１０２の外周面の傾斜角度αは、十字ネジ回し２の羽部２０２の傾斜面２０２ａの傾斜角度β、すなわち２６．５度より大きい角度である２７度であるため、図３（ｂ）に示すように、ネジ抜取部１０２の６本の刃１０４の外周側に位置する刃先１０４ａの一部が、潰れた係合溝３０１ａの縁部３０１１ａに当接されることとなる。潰れた係合溝３０１ａの縁部３０１１ａとは、例えば、ネジ３の潰れた係合溝３０１の内側面の、ネジ頭部３０２の表面が交わる部分（例えば内側面とネジ頭部３０２の表面とがなす角）やその近傍である。刃１０４は先端側から後端側に向かって左回りに螺旋状に伸びており、この刃１０４は外周側に刃先が形成されているため、上記のようにネジ抜取部１０２の先端側を押し込むように挿入した状態で軸体１０１を軸心１０１ａを回転軸として左周りに回転させると、ネジ抜取部１０２にネジ３方向にねじ込まれようとする力が加わり、刃１０４の、係合溝３０１の縁部３０１１ａに当接されている刃先１０４ａが、係合溝３０１の開口部３０１１の縁部３０１１ａに食い込もうとする。これにより、ネジ抜取工具１の軸体１０１に加えられた回転力が、ネジ３に伝達され、ネジ３がゆるむ方向に回転して部材から抜き出される。   In order to extract the screw 3 having the crushed engagement groove 301a as described above from a certain member, the screw removing tool 1 is inserted into the crushed engagement groove 301a of the screw 3, as shown in FIG. Inserting the tip of the screw extraction part 102 so as to push it in, the shaft body 101 is rotated to the left, which is the opposite direction to the direction in which the screw 3 is turned. When inserting the screw extraction tool 1 into the engagement groove 301a, it is preferable to insert the shaft center 101a of the shaft body 101 and the shaft center 300 of the screw 3 so as to be located on substantially the same straight line. The inclination angle α of the outer peripheral surface of the screw extraction part 102 of the screw extraction tool 1 is 27 degrees, which is an inclination angle β of the inclined surface 202a of the wing part 202 of the cross screwdriver 2, that is, an angle larger than 26.5 degrees. As shown in FIG. 3B, a part of the blade edge 104a located on the outer peripheral side of the six blades 104 of the screw extraction portion 102 is brought into contact with the edge portion 3011a of the crushed engagement groove 301a. It becomes. The edge 3011a of the crushed engagement groove 301a is, for example, the portion of the inner surface of the crushed engagement groove 301 of the screw 3 where the surface of the screw head 302 intersects (for example, the inner surface and the surface of the screw head 302). The angle formed by) and its vicinity. The blade 104 spirally extends counterclockwise from the front end side toward the rear end side. Since the blade 104 has a cutting edge formed on the outer peripheral side, the front end side of the screw extraction portion 102 is pushed in as described above. When the shaft body 101 is rotated counterclockwise with the shaft center 101a as the rotation axis in the inserted state, a force to be screwed in the screw 3 direction is applied to the screw extraction portion 102, and the engagement groove 301 of the blade 104 is applied. The cutting edge 104 a that is in contact with the edge portion 3011 a of the engagement groove 301 tries to bite into the edge portion 3011 a of the opening 3011 of the engagement groove 301. Thereby, the rotational force applied to the shaft body 101 of the screw extraction tool 1 is transmitted to the screw 3, and the screw 3 rotates in the loosening direction and is extracted from the member.

以上、本実施の形態においては、ネジ頭部の中心部にあらかじめ下穴を穿設することなく、係合溝が潰れたネジをネジがゆるむ方向に回転させることができ、係合溝が潰れたネジを容易に抜き取ることができる。   As described above, in the present embodiment, the screw with the crushed engagement groove can be rotated in the direction in which the screw is loosened without previously drilling a pilot hole at the center of the screw head. Can be easily removed.

なお、上記具体例においては、傾斜角度αを２７度としたネジ抜取工具１を用いた場合について説明したが、ネジ抜取工具１の傾斜角度αは、一般的な十字ネジ回しの傾斜角度βである２６．５度より大きければよい。   In the above specific example, the case of using the screw extraction tool 1 with the inclination angle α of 27 degrees has been described, but the inclination angle α of the screw extraction tool 1 is the inclination angle β of a general cross screwdriver. It may be larger than a certain 26.5 degrees.

また、上記実施の形態においては、羽部２０２の傾斜面２０２ａの傾斜角度βが、２６．５度である一般的な十字ネジ回し２を用いたことによって潰れた係合溝３０１を有するネジを、ネジ抜取工具１で抜き取る場合を例に挙げて説明したが、ネジ抜取工具１は、傾斜角度βが２６．５度である十字ネジ回しと同様に一般的に用いられる傾斜角度βが２６度の十字ネジ回しを用いたことによって係合溝３０１が潰れたネジ３を抜き取る際にも利用することができる。本実施の形態のネジ抜取工具１のネジ抜取部１０２の傾斜角度αは２６．５度よりも大きい角度であるため、傾斜角度βが２６度である十字ネジ回しを用いたことで潰れたネジ３の係合溝３０１ａの縁部３０１１ａに対しても、上記の具体例と同様に、ネジ抜取部１０２の螺旋状の刃１０４を食い込ませて、あるいは引っかけて、ネジ３を緩める方向に回すことが可能である。   Moreover, in the said embodiment, the screw | thread which has the engagement groove | channel 301 crushed by using the general cross screwdriver 2 whose inclination | tilt angle (beta) of the inclined surface 202a of the wing | blade part 202 is 26.5 degree | times is used. In the above description, the case of extracting with the screw extraction tool 1 has been described as an example. However, the screw extraction tool 1 has an inclination angle β of 26 degrees that is generally used in the same manner as a cross screwdriver having an inclination angle β of 26.5 degrees. This can also be used when removing the screw 3 whose engagement groove 301 is crushed by using the cross screwdriver. Since the inclination angle α of the screw extraction portion 102 of the screw extraction tool 1 of the present embodiment is an angle larger than 26.5 degrees, the screw crushed by using a cross screwdriver with the inclination angle β of 26 degrees. Similarly to the above-described specific example, the spiral blade 104 of the screw extraction portion 102 is bitten or hooked to the edge portion 3011a of the third engagement groove 301a and the screw 3 is rotated in the loosening direction. Is possible.

つまり、ネジ抜取工具１の傾斜角度αが、一般的な十字ネジ回し２（例えば、Ｈ型の十字ネジ回しや、Ｓ型の十字ネジ回し）の傾斜角度βである２６度および２６．５度より大きければ、一般的な十字ネジ回し２によって潰れた係合溝を有するネジ３を回して抜き取ることができる。すなわち、ネジ抜取工具１の傾斜角度αは、２６．５度よりも大きければよい。   That is, the inclination angle α of the screw extraction tool 1 is 26 degrees and 26.5 degrees, which are the inclination angles β of a general cross screwdriver 2 (for example, an H-shaped crossscrewdriver or an S-shaped crossscrewdriver). If it is larger, the screw 3 having the engagement groove crushed by the general cross screwdriver 2 can be turned out. That is, the inclination angle α of the screw extraction tool 1 only needs to be larger than 26.5 degrees.

なお、傾斜角度αが大きすぎると、ネジ３の潰れた係合溝３０１ａの縁部３０１１ａに刃１０４が食い込まなくなったり引っ掛からなくなったりすることから、傾斜角度αは、ネジ３の潰れた係合溝３０１ａの縁部３０１１ａに刃１０４が食い込ましたり、引っかけたりすることが可能な範囲の値であることが好ましい。   If the inclination angle α is too large, the blade 104 does not bite into the edge 3011a of the engagement groove 301a where the screw 3 is crushed or is not caught. Therefore, the inclination angle α is less than the engagement groove where the screw 3 is crushed. It is preferable that the value is within a range in which the blade 104 can bite into or be caught in the edge portion 3011a of 301a.

また、上記実施の形態においては、ネジ抜取部１０２が６本の螺旋状の刃１０４を有する場合について説明したが、螺旋状の刃１０４の数は１以上であればその数は問わない。また、螺旋状の溝１０３を形成して、隣接した溝１０３の間に刃１０４を形成する場合、形成する溝１０３の数は、２以上であればよい。   Moreover, in the said embodiment, although the case where the screw extraction part 102 had the six helical blades 104 was demonstrated, if the number of the helical blades 104 is one or more, the number will not ask | require. Further, when the spiral groove 103 is formed and the blade 104 is formed between the adjacent grooves 103, the number of the grooves 103 to be formed may be two or more.

また、上記実施の形態においては、螺旋状の刃１０４のそれぞれの巻数が略一巻きとした場合について説明したが、刃１０４の巻数は問わない。例えば、刃１０４の巻数は、１／２巻や、１／３巻等、１巻よりも少ない巻数であってもよく、１巻以上の巻数としてもよい。刃１０４の巻数は、例えば、ネジ抜取部１０２の外周に設けられる螺旋状の刃１０４の数や、ネジ抜取部１０２の高さや径等に応じて変更しても良い。   Moreover, although the said embodiment demonstrated the case where each winding number of the spiral blade 104 was set to substantially one winding, the winding number of the blade 104 is not ask | required. For example, the number of turns of the blade 104 may be less than 1, such as 1/2 or 1/3, or may be 1 or more. The number of turns of the blade 104 may be changed according to, for example, the number of spiral blades 104 provided on the outer periphery of the screw extraction unit 102, the height and diameter of the screw extraction unit 102, and the like.

なお、抜取対象となるネジ３のネジ頭部３０２等の形状は問わない。例えば、ネジ３のネジ頭部３０２の形状は、皿形状であっても良く、ナベ形状であっても良く、丸皿形状であってもよい。   The shape of the screw head 302 of the screw 3 to be extracted is not limited. For example, the shape of the screw head 302 of the screw 3 may be a dish shape, a pan shape, or a round dish shape.

本発明は、以上の実施の形態に限定されることなく、種々の変更が可能であり、それらも本発明の範囲内に包含されるものであることは言うまでもない。   The present invention is not limited to the above-described embodiments, and various modifications are possible, and it goes without saying that these are also included in the scope of the present invention.

以上のように、本発明にかかるネジ抜取工具は、ネジを抜き取る工具として適しており、特に、ネジ頭部の係合溝が潰れたネジを抜き取る工具等として有用である。   As described above, the screw removal tool according to the present invention is suitable as a tool for removing a screw, and is particularly useful as a tool for removing a screw whose engagement groove on the screw head is crushed.

１ ネジ抜取工具
２ ネジ回し
３ ネジ
１０１ 軸体
１０１ａ 軸心
１０２ ネジ抜取部
１０３ 溝
１０４ 刃
１０４ａ 刃先
１０５ テーパー面
１０６ 面 DESCRIPTION OF SYMBOLS 1 Screw extraction tool 2 Screwdriver 3 Screw 101 Shaft body 101a Axis center 102 Screw extraction part 103 Groove 104 Blade 104a Cutting edge 105 Tapered surface 106 Surface

Claims (6)

ネジ頭部の係合溝が潰れたネジを抜き取るためのネジ抜取工具であって、
軸体と、
前記軸体の先端部分に形成されており、先端に向かって先細りとなる形状を有するネジ抜取部と、を備え、
前記ネジ抜取部の外周側には、刃先が外周側に設けられた刃であって、前記ネジ抜取部の先端側から後端側に向かって螺旋状に伸びる１以上の刃が形成されており、
前記１以上の刃の刃先を含むテーパー面の、前記軸体の軸心に対する傾斜角度が、２６．５度より大きいネジ抜取工具。 A screw extraction tool for extracting a screw whose engagement groove on the screw head is crushed,
A shaft body;
A screw extraction portion that is formed at the tip portion of the shaft body and has a shape that tapers toward the tip; and
On the outer peripheral side of the screw extraction portion, one or more blades that are provided with a cutting edge on the outer peripheral side and extend spirally from the front end side to the rear end side of the screw extraction portion are formed. ,
A screw extracting tool, wherein an inclination angle of a tapered surface including a cutting edge of the one or more blades with respect to an axis of the shaft body is larger than 26.5 degrees. 前記ネジ抜取部の外周側には、複数の刃が並列するよう形成されている請求項１記載のネジ抜取工具。 The screw extraction tool according to claim 1, wherein a plurality of blades are formed in parallel on an outer peripheral side of the screw extraction unit. 前記ネジ抜取部の外周側には、６つの刃が並列するよう形成されている請求項１または請求項２記載のネジ抜取工具。 The screw extraction tool according to claim 1, wherein six blades are formed in parallel on an outer peripheral side of the screw extraction unit. 前記螺旋状の刃の回転方向は、前記ネジのネジ切り方向とは逆方向である請求項１から請求項３いずれか一項記載のネジ抜取工具。 The screw extraction tool according to any one of claims 1 to 3, wherein a rotation direction of the spiral blade is opposite to a screw cutting direction of the screw. 前記螺旋状の刃の後端側の側面が、前記テーパー面に対してなす角度が、当該刃の前端側の側面が、前記テーパー面に対してなす角度よりも大きい請求項１から請求項４いずれか一項記載のネジ抜取工具。 The angle formed by the side surface on the rear end side of the spiral blade with respect to the tapered surface is larger than the angle formed by the side surface on the front end side of the blade with respect to the tapered surface. The screw extraction tool as described in any one of Claims. 前記ネジ抜取部の先端が面である請求項１から請求項５いずれか一項記載のネジ抜取工具。 The screw extraction tool according to any one of claims 1 to 5, wherein a tip of the screw extraction portion is a surface.
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JP2001162552A (en) * 1999-12-13 2001-06-19 Hiroshi Morimoto Reversely rotating bit capable of removing worn down screw
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JP4272608B2 (en) * 2004-10-07 2009-06-03 株式会社ミツトモ製作所 Unscrewing bit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022067985A (en) * 2020-10-21 2022-05-09 株式会社兼古製作所 Screw remover

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WO2019008865A1 (en) 2019-01-10

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