JP2017209766A - Polishing tool for punch - Google Patents

Polishing tool for punch Download PDF

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JP2017209766A
JP2017209766A JP2016105971A JP2016105971A JP2017209766A JP 2017209766 A JP2017209766 A JP 2017209766A JP 2016105971 A JP2016105971 A JP 2016105971A JP 2016105971 A JP2016105971 A JP 2016105971A JP 2017209766 A JP2017209766 A JP 2017209766A
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polishing
punch
shape
cutting blade
tool
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JP6657017B2 (en
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高芝　伊知郎
Ichiro Takashiba
伊知郎 高芝
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TAKASHIBA GIMUNE SEISAKUSHO KK
Takashiba Gimune Seisakushokk
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TAKASHIBA GIMUNE SEISAKUSHO KK
Takashiba Gimune Seisakushokk
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  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a polishing tool which can uniformly polish outside and inside of a ring-shaped cutting edge positioned on one end of a punch used for boring a hole having a circular shape on leather, paper, a resin sheet, rubber, a metal plate, a metal net or the like, with one tool, and enables a general user to easily polish the cutting edge.SOLUTION: There is provided a polishing tool for punch that includes a first polishing section 1 which has abrasive grains 4 thereon and projects in a conical or gimlet shape, a base portion 2 positioned on the bottom face side of the first polishing section 1, and a second polishing section 3 which is positioned in an opposite side to the first polishing section 1 on the base portion 2, has abrasive grains thereon and is recessed in the conical or gimlet shape, or the polishing tool for punch, where the first polishing section 1 has the conical or gimlet shape and the second polishing section 3 has the conical or gimlet shape.SELECTED DRAWING: Figure 1

Description

本発明は、皮、紙、樹脂シート、ゴム、金属板、金属網等に円形状等の孔をあけるために使用されるポンチの刃先を研磨するときに使用される研磨具に関する。   The present invention relates to a polishing tool used when polishing a cutting edge of a punch used to make a circular hole or the like in a leather, paper, resin sheet, rubber, metal plate, metal net or the like.

従来、工作、手芸、工芸、美術などの種々の分野において、皮、紙、樹脂シート、ゴム、金属板、金属網等の比較的厚みが薄い部材に所望の大きさの孔をあけるために、ポンチと呼ばれる穿孔具が使用されている。一般には、ポンチの一端側には円筒形状を有する部材の先端にリング状の切断刃が設けられているために、前記の比較的厚みの薄い部材に対しポンチの刃先を当て、切断刃とは反対側である他端側を金槌や木槌等の殴打する部材で叩くことによって打ち抜いて、孔をあけることができる。   Conventionally, in various fields such as work, handicrafts, crafts, art, etc., in order to make a hole of a desired size in a relatively thin member such as leather, paper, resin sheet, rubber, metal plate, metal net, A punch called a punch is used. Generally, since a ring-shaped cutting blade is provided at the tip of a cylindrical member on one end side of the punch, the punch blade edge is applied to the relatively thin member, and the cutting blade is The other end, which is the opposite side, can be punched out by hitting it with a hammering member such as a hammer or a wooden hammer.

ポンチの使用回数が増えるに従って徐々に切断刃が摩耗することなどにより切れ味が悪化して、綺麗な孔をあけにくくなるところ、再び購入時のような切れ味を復元するためには切断刃を研磨する必要がある。   As the number of punches used increases, the cutting edge gradually wears out and the sharpness deteriorates, making it difficult to make a beautiful hole. To restore the sharpness at the time of purchase again, the cutting blade is polished. There is a need.

ポンチの切断刃を研磨するには、使用者は製造メーカーに送付して、製造メーカーにおいて、種々の直径を有するリング状の切断刃に対して、グラインダーを用いてそれぞれのサイズごとに用意された専用の砥石にその切断刃の外側をあてがって研磨し、さらにその内側を棒状のヤスリ等で研磨することにより行っていた。   In order to polish the punch cutting blade, the user sends it to the manufacturer, and the manufacturer prepared for each size of ring-shaped cutting blades with various diameters using a grinder. The cutting was performed by applying the outside of the cutting blade to a special grindstone and polishing the inside with a rod-shaped file or the like.

しかしながら、ポンチの一端側に位置する切断刃が直線状ではなく円環状など閉じた線状であるために、種々の直径を有する切断刃の外側と内側を研磨するためにはそれぞれのサイズごとに用意された専用の砥石を使用しなければならず、さらに、均一に研磨することが難しいことから一般の使用者が簡易に研磨することが困難であったという課題があった。   However, since the cutting blade located on one end side of the punch is not a straight line but a closed linear shape such as an annular shape, it is necessary to grind the outside and inside of a cutting blade having various diameters for each size. The prepared dedicated grindstone must be used, and furthermore, since it is difficult to polish uniformly, there is a problem that it is difficult for general users to easily polish.

そこで、本発明は、皮、紙、樹脂シート、ゴム、金属板、金属網等に円形状等の孔をあけるために使用されるポンチの一端に位置するリング状の切断刃を研磨するときに、切断刃の外側と内側を、一つの道具で研磨することができ、さらに均一に研磨することでき、また、一般の使用者でも簡易に研磨することができる研磨具を提供することを目的とする。   Therefore, the present invention is for polishing a ring-shaped cutting blade located at one end of a punch used to make a circular hole in a leather, paper, resin sheet, rubber, metal plate, metal net or the like. An object of the present invention is to provide a polishing tool that can polish the outer and inner sides of the cutting blade with a single tool, can be evenly polished, and can be easily polished by a general user. To do.

〔１〕すなわち、本発明は、表面に砥粒（４）を有し錐状又は錐台状に突出する第一研磨部（１）と、前記第一研磨部（１）の底面側に位置する基部（２）と、前記基部（２）において、前記第一研磨部（１）とは反対側に位置し、表面に砥粒（４）を有し錐状又は錐台状に窪んでいる第二研磨部（３）とを備えることを特徴とするポンチ用研磨具である。
〔２〕そして、前記第一研磨部（１）が円錐状又は円錐台状であり、前記第二研磨部（３）が円錐状又は円錐台状であることを特徴とする前記〔１〕に記載のポンチ用研磨具である。
〔３〕そして、前記第一研磨部（１）における対向する稜線のなす角度が１０〜４０度であることを特徴とする前記〔１〕又は前記〔２〕に記載のポンチ用研磨具である。
〔４〕そして、前記第二研磨部（３）における対向する稜線のなす角度が６０〜１００度であることを特徴とする前記〔１〕から前記〔３〕のいずれかに記載のポンチ用研磨具である。
〔５〕そして、前記基部（２）の外周部に凹凸が設けられていることを特徴とする前記〔１〕から前記〔４〕のいずれかに記載のポンチ用研磨具である。 [1] That is, the present invention is located on the bottom side of the first polishing section (1) having the abrasive grains (4) on the surface and projecting in the shape of a cone or a frustum, and the first polishing section (1). The base portion (2) and the base portion (2) are located on the opposite side of the first polishing portion (1), have abrasive grains (4) on the surface, and are recessed in a cone shape or a frustum shape. A punch polishing tool comprising a second polishing section (3).
[2] In the above [1], the first polishing portion (1) has a conical shape or a truncated cone shape, and the second polishing portion (3) has a conical shape or a truncated cone shape. The punching abrasive tool according to the description.
[3] The punch polishing tool according to [1] or [2], wherein an angle formed by opposing ridge lines in the first polishing section (1) is 10 to 40 degrees. .
[4] The punch polishing according to any one of [1] to [3], wherein an angle formed by opposing ridge lines in the second polishing section (3) is 60 to 100 degrees. It is a tool.
[5] The punch polishing tool according to any one of [1] to [4], wherein an unevenness is provided on an outer peripheral portion of the base (2).

本発明のポンチ用研磨具によれば、皮、紙、樹脂シート、ゴム、金属板、金属網等に円形状等の孔をあけるために使用されるポンチの一端に位置するリング状の切断刃を研磨するときに、切断刃の外側と内側を、一つの道具で研磨することができ、さらに均一に研磨することできる。   According to the punch polishing tool of the present invention, a ring-shaped cutting blade located at one end of a punch used to make a circular hole in a leather, paper, resin sheet, rubber, metal plate, metal net or the like When grinding, the outer side and the inner side of the cutting blade can be polished with one tool, and can be further uniformly polished.

本発明のポンチ用研磨具の一実施形態を示す底部から見た斜視図である。It is the perspective view seen from the bottom part which shows one Embodiment of the abrasive | polishing tool for punches of this invention. 本発明のポンチ用研磨具の一実施形態を示す頂部から見た斜視図である。It is the perspective view seen from the top which shows one Embodiment of the abrasive | polishing tool for punches of this invention. 本発明のポンチ用研磨具を用いてポンチの切断刃の外側を研磨する方法を示した部分切断図である。It is the partial cutaway figure which showed the method of grind | polishing the outer side of the cutting blade of a punch using the polishing tool for punches of this invention. 本発明のポンチ用研磨具を用いてポンチの切断刃の内側を研磨する方法を示した部分切断図である。It is the partial cutaway figure which showed the method of grind | polishing the inner side of the cutting blade of a punch using the polishing tool for punches of this invention.

以下、本発明のポンチ用研磨具に関する実施形態について、図面を参照して詳しく説明する。なお、以下に説明する実施形態は、本発明を実施するに好ましい具体例であるから、技術的に種々の限定がなされているが、本発明は、以下の説明において特に発明を限定する旨明記されていない限り、これらの形態に限定されるものではない。また、数値範囲をあらわす記載は上限と下限を含むものである。   Hereinafter, embodiments of the punch polishing tool of the present invention will be described in detail with reference to the drawings. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms. Moreover, the description showing a numerical range includes an upper limit and a lower limit.

図１から図４に示すように、ポンチ用研磨具は、表面に砥粒４を有し錐状又は錐台状に突出する第一研磨部１と、第一研磨部１の底面側に位置する基部２と、基部２において、第一研磨部１とは反対側に位置し、表面に砥粒４を有し錐状又は錐台状に窪んでいる第二研磨部３を備えている。   As shown in FIG. 1 to FIG. 4, the punch polishing tool has a first polishing portion 1 that has abrasive grains 4 on its surface and protrudes in a cone shape or a frustum shape, and is positioned on the bottom side of the first polishing portion 1. And a second polishing portion 3 that is located on the opposite side of the first polishing portion 1 and has abrasive grains 4 on the surface and is recessed in a cone shape or a frustum shape.

第一研磨部１は、その表面に砥粒４が固設されている円錐状の部材である。図４（ａ）（ｂ）に示すように、第一研磨部１をポンチ５の一端側に位置する円環状の切断刃５１の内側に挿入し、第一研磨部１又はポンチ５を相対的に中心軸周りに回転させることにより、切断刃５１の内側を研磨することができる。   The 1st grinding | polishing part 1 is a cone-shaped member by which the abrasive grain 4 is fixed by the surface. As shown in FIGS. 4A and 4B, the first polishing section 1 is inserted inside an annular cutting blade 51 located on one end side of the punch 5, and the first polishing section 1 or the punch 5 is relatively moved. The inside of the cutting blade 51 can be polished by rotating it around the central axis.

第一研磨部１は、錐状又は錐台状に形成されていることにより、ポンチ５の切断刃５１の径が異なる複数の種類のものに対して、一つの部材で研磨することができる。本実施形態において、第一研磨部１の形状は、円錐状であるが、他の実施形態において、円錐台（ただし、上底の直径が切断刃５１の内径よりも小さいもの）、角錐状、角錐台状（ただし、上底の最大の亘り幅が切断刃５１の内径よりも小さいもの）とすることができる。角錐状又は角錐台状の場合、切断刃５１の内側との接触箇所を増やすにためにできるだけ角数の多い多角形状のものとすることが好ましい。   The 1st grinding | polishing part 1 can grind | polish with one member with respect to several types from which the diameter of the cutting blade 51 of the punch 5 differs by forming in cone shape or frustum shape. In the present embodiment, the shape of the first polishing unit 1 is a conical shape. However, in other embodiments, a truncated cone (however, the diameter of the upper base is smaller than the inner diameter of the cutting blade 51), a pyramid shape, It can be in the shape of a truncated pyramid (however, the maximum span of the upper base is smaller than the inner diameter of the cutting blade 51). In the case of a pyramid shape or a truncated pyramid shape, in order to increase the number of contact points with the inside of the cutting blade 51, it is preferable that the polygonal shape has as many corners as possible.

そして、図３、図４に示すように、第一研磨部１における対向する稜線のなす角度αは、本実施形態では、第一研磨部１における頂角に相当し、１０〜４０度であることが好ましい。この角度の範囲であれば、切断刃５１の刃先が鋭角となるように、切断刃５１の内側を研磨することができる。図３、図４に示すように、本実施形態における第一研磨部１における対向する稜線のなす角度αは２０度である。また、他の実施形態において角錐状又は角錐台状のときには、第一研磨部１における対向する稜線のなす角度αは、複数存在するが切断刃５１の内側に当接することからこのうち最大の角度のものである。   As shown in FIGS. 3 and 4, the angle α formed by the opposing ridge lines in the first polishing unit 1 corresponds to the apex angle in the first polishing unit 1 and is 10 to 40 degrees in the present embodiment. It is preferable. Within this angle range, the inside of the cutting blade 51 can be polished so that the cutting edge of the cutting blade 51 has an acute angle. As shown in FIGS. 3 and 4, the angle α formed by the opposing ridge lines in the first polishing unit 1 in the present embodiment is 20 degrees. In another embodiment, when the shape is a pyramid or a truncated pyramid, there are a plurality of angles α formed by opposing ridge lines in the first polishing unit 1, but the maximum angle among them is in contact with the inside of the cutting blade 51. belongs to.

また、本実施形態において、第一研磨部１は、基部２と一体的に形成されているが、他の実施形態において、第一研磨部１と基部２とを螺子等により着脱自在にすることもできる。   Further, in the present embodiment, the first polishing unit 1 is formed integrally with the base 2. However, in other embodiments, the first polishing unit 1 and the base 2 are detachable with screws or the like. You can also.

基部２は、第一研磨部１の底面側に位置する部材であり、使用者が研磨作業をするときに手で持つ部材である。本実施形態において、基部２は、円柱状であるが、他の実施形態において、角柱状等とすることができる。   The base portion 2 is a member located on the bottom surface side of the first polishing portion 1 and is a member that is held by hand when a user performs a polishing operation. In the present embodiment, the base portion 2 has a cylindrical shape, but in other embodiments, the base portion 2 may have a prismatic shape or the like.

基部２の外周部の一部又は全部に、複数の溝が形成されたり、突起物が形成されたり、それらの組み合わせなどにより凹凸が設けられていることが好ましい。凹凸が設けられていることにより、作業者が研磨作業をするときに手で持っても滑りにくくなるので作業がしやすくなる。図１、図２に示すように、本実施形態において、二方向の複数の溝がクロスする綾目ローレットという加工が施されている。   It is preferable that a plurality of grooves, protrusions, or combinations thereof are provided on a part or all of the outer peripheral portion of the base portion 2. Since the unevenness is provided, even if the operator holds it by hand when performing the polishing operation, it becomes difficult to slip, so that the operation becomes easy. As shown in FIGS. 1 and 2, in the present embodiment, processing called a twill knurling in which a plurality of grooves in two directions cross is performed.

第二研磨部３は、基部２において、第一研磨部１とは反対側に位置し、表面に砥粒４を有し錐状又は錐台状に窪んでいる部分である。図３（ａ）（ｂ）に示すように、第二研磨部３をポンチ５の一端側に位置する円環状の切断刃５１の外側に覆うように当接し、第二研磨部３又はポンチ５を相対的に中心軸周りに回転させることにより、切断刃５１の外側を研磨することができる。   The second polishing unit 3 is a portion of the base 2 that is located on the opposite side of the first polishing unit 1 and has abrasive grains 4 on the surface and is recessed in a cone shape or a frustum shape. As shown in FIGS. 3 (a) and 3 (b), the second polishing portion 3 is brought into contact with the outside of an annular cutting blade 51 located on one end side of the punch 5, and the second polishing portion 3 or the punch 5 is contacted. The outer side of the cutting blade 51 can be polished by relatively rotating around the central axis.

第二研磨部３は、錐状又は錐台状に形成されていることにより、ポンチ５の切断刃５１の径が異なる複数の種類のものに対して、一つの部分で研磨することができる。本実施形態において、第二研磨部３の形状は、円錐状であるが、他の実施形態において、円錐台（ただし、上底の直径が切断刃５１の外径よりも大きいもの）、角錐状、角錐台状（ただし、下底の最大の亘り幅が切断刃５１の外径よりも大きいもの）とすることができる。角錐状又は角錐台状の場合、切断刃５１の外側との接触箇所を増やすにためにできるだけ角数の多い多角形状のものとすることが好ましい。   The 2nd grinding | polishing part 3 can grind | polish in one part with respect to several types from which the diameter of the cutting blade 51 of the punch 5 differs by being formed in cone shape or frustum shape. In the present embodiment, the shape of the second polishing portion 3 is conical, but in other embodiments, a truncated cone (however, the diameter of the upper base is larger than the outer diameter of the cutting blade 51), a pyramid shape A truncated pyramid shape (however, the maximum width of the lower base is larger than the outer diameter of the cutting blade 51). In the case of a pyramid shape or a truncated pyramid shape, in order to increase the number of contact points with the outside of the cutting blade 51, it is preferable to have a polygonal shape having as many corners as possible.

そして、図３、図４に示すように、第二研磨部３における対向する稜線のなす角度βは、本実施形態では、第二研磨部３における頂角に相当し、６０〜１００度であることが好ましい。この角度の範囲であれば、切断刃５１の刃先が鋭角となるように、切断刃５１の外側を研磨することができる。図３、図４に示すように、本実施形態における第二研磨部３における対向する稜線のなす角度βは８０度である。また、他の実施形態において角錐状又は角錐台状のときには、第二研磨部３における対向する稜線のなす角度βは、複数存在するが切断刃５１の外側に当接することからこのうち最大の角度のものである。   As shown in FIGS. 3 and 4, the angle β formed by the opposing ridge lines in the second polishing unit 3 corresponds to the apex angle in the second polishing unit 3 in the present embodiment, and is 60 to 100 degrees. It is preferable. Within this angle range, the outside of the cutting blade 51 can be polished so that the cutting edge of the cutting blade 51 has an acute angle. As shown in FIGS. 3 and 4, the angle β formed by the opposing ridge lines in the second polishing unit 3 in the present embodiment is 80 degrees. In another embodiment, when the shape is a pyramid shape or a truncated pyramid shape, there are a plurality of angles β formed by opposing ridge lines in the second polishing unit 3, but the maximum angle among them is in contact with the outside of the cutting blade 51. belongs to.

砥粒４は、第一研磨部１及び第二研磨部３に接着剤や焼結等で固設される硬質の微粒子であり、切断刃５１と当接して研磨する部材である。て、砥粒４の粒度としては、第一研磨部１及び第二研磨部３のいずれにおいても、ＪＩＳ Ｂ ４１３０「ふるいによる分級」における１４０／１７０（平均粒子径が１０５μｍ）〜３２５／４００（平均粒子径が４４μｍ）であることが好ましい。砥粒４の粒度がこの範囲にあると、切断刃５１の切れ味を復元するために、切断刃５１を鋭利にすることができる。   The abrasive grains 4 are hard fine particles fixed to the first polishing section 1 and the second polishing section 3 by an adhesive, sintering, or the like, and are members that abut against the cutting blade 51 for polishing. The particle size of the abrasive grains 4 is 140/170 (average particle diameter is 105 μm) to 325/400 (average particle diameter is 105 μm) in JIS B 4130 “classification by sieving” in both the first polishing section 1 and the second polishing section 3. The average particle diameter is preferably 44 μm). When the grain size of the abrasive grains 4 is within this range, the cutting blade 51 can be sharpened to restore the sharpness of the cutting blade 51.

また、砥粒４の材質としては、褐色アルミナ系、白色アルミナ系、単結晶アルミナ系等のアルミナ系、窒化ホウ素等のホウ素系、黒色炭化ケイ素系、緑色炭化ケイ素系などの炭化ケイ素系、ダイヤモンドなど、包丁、はさみ、刀、ナイフ、ピーラーなどの刃物の刃先に使用される材質の硬度よりも高い硬度を有する材質であることが好ましい。   The material of the abrasive grains 4 is brown alumina, white alumina, alumina such as single crystal alumina, boron such as boron nitride, silicon carbide such as black silicon carbide, green silicon carbide, diamond, etc. It is preferable that the material has a hardness higher than the hardness of the material used for the cutting edge of a knife such as a knife, scissors, a sword, a knife, or a peeler.

そして、第一研磨部１と基部２の材料としては、ステンレスや鋼などの金属、セラミックス、熱可塑性樹脂、熱硬化性樹脂、ガラス、木材、弾性ゴムなど種々の材料を使用することができる。経年劣化が少なく破損しにくい強度を備えることから、金属であることが好ましい。   And as materials of the 1st grinding | polishing part 1 and the base 2, various materials, such as metals, such as stainless steel and steel, ceramics, a thermoplastic resin, a thermosetting resin, glass, wood, and elastic rubber, can be used. A metal is preferable because it has a strength that is less likely to be damaged due to aged deterioration.

このように、本発明のポンチ用研磨具においては、第一研磨部１と第二研磨部３を備えるために一つの道具でポンチ５の切断刃５１の内側と外側のそれぞれを研磨することでき、そして、第一研磨部１と第二研磨部３が錐状又は錐台状のために切断刃５１の直径が異なる複数のポンチであっても一つの道具で研磨することができる。また、研磨の度に製造メーカーに研磨を依頼しなくとも、一般の使用者自ら簡易に研磨することができる。   Thus, in the punch polishing tool of the present invention, since the first polishing part 1 and the second polishing part 3 are provided, each of the inside and the outside of the cutting blade 51 of the punch 5 can be polished with one tool. And even if it is a several punch from which the diameter of the cutting blade 51 differs because the 1st grinding | polishing part 1 and the 2nd grinding | polishing part 3 are cone shape or frustum shape, it can grind | polish with one tool. Further, even if the polishing is not requested from the manufacturer every time the polishing is performed, a general user can easily perform polishing.

１・・・第一研磨部
２・・・基部
３・・・第二研磨部
４・・・砥粒
５・・・ポンチ
５１・・・切断刃
α・・・第一研磨部における対向する稜線のなす角度
β・・・第二研磨部における対向する稜線のなす角度 DESCRIPTION OF SYMBOLS 1 ... 1st grinding | polishing part 2 ... Base 3 ... 2nd grinding | polishing part 4 ... Abrasive grain 5 ... Punch 51 ... Cutting blade (alpha) ... Opposite ridgeline in 1st grinding | polishing part Formed by the angle β of the second grinding part.

Claims (5)

表面に砥粒を有し錐状又は錐台状に突出する第一研磨部と、
前記第一研磨部の底面側に位置する基部と、
前記基部において、前記第一研磨部とは反対側に位置し、表面に砥粒を有し錐状又は錐台状に窪んでいる第二研磨部と
を備えることを特徴とするポンチ用研磨具。 A first polishing portion having abrasive grains on the surface and projecting in a cone shape or a frustum shape;
A base located on the bottom side of the first polishing section;
A punch polishing tool, comprising: a second polishing portion which is located on the opposite side of the base from the first polishing portion and which has abrasive grains on the surface and is recessed in a cone shape or a frustum shape. . 前記第一研磨部が円錐状又は円錐台状であり、前記第二研磨部が円錐状又は円錐台状であることを特徴とする請求項１に記載のポンチ用研磨具。 2. The punch polishing tool according to claim 1, wherein the first polishing portion is conical or frustoconical, and the second polishing portion is conical or frustoconical. 前記第一研磨部における対向する稜線のなす角度が１０〜４０度であることを特徴とする請求項１又は請求項２に記載のポンチ用研磨具。 The punch polishing tool according to claim 1 or 2, wherein an angle formed by opposing ridge lines in the first polishing section is 10 to 40 degrees. 前記第二研磨部における対向する稜線のなす角度が６０〜１００度であることを特徴とする請求項１から請求項３のいずれかに記載のポンチ用研磨具。 4. The punch polishing tool according to claim 1, wherein an angle formed by opposing ridge lines in the second polishing portion is 60 to 100 degrees. 5. 前記基部の外周部に凹凸が設けられていることを特徴とする請求項１から請求項４のいずれかに記載のポンチ用研磨具。 The punch polishing tool according to any one of claims 1 to 4, wherein the outer peripheral portion of the base is provided with irregularities.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109015431A (en) * 2018-09-30 2018-12-18 广州汇专工具有限公司 Multi-purpose bistrique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109015431A (en) * 2018-09-30 2018-12-18 广州汇专工具有限公司 Multi-purpose bistrique

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