JP2020142359A

JP2020142359A - Driver bit

Info

Publication number: JP2020142359A
Application number: JP2019236285A
Authority: JP
Inventors: 二郎田口; Jiro Taguchi; 祥宗兒玉; Yoshimune Kodama
Original assignee: Vessel Industrial Co Inc
Current assignee: Vessel Industrial Co Inc
Priority date: 2019-03-08
Filing date: 2019-12-26
Publication date: 2020-09-10
Anticipated expiration: 2039-03-08
Also published as: JP6898672B2

Abstract

To provide a driver bit configured so that a service life of the driver bit can be improved while preventing a blade part from being damaged.SOLUTION: A driver bit 1 is formed in a shaft shape, which comprises a buffer shaft part 4 provided between one end part and the other end part in a shaft line direction of the driver bit 1, where on an outer surface of the buffer shaft part 4 are formed a plurality of plastic deformation parts 40 that are recessed concavely toward inside in a radial direction of the buffer shaft part 4 and are discontinuous to each other. The plurality of plastic deformation parts 40 are aligned in the shaft line direction and in a circumferential direction having a center line of the driver bit 1 as a center, and high-rigid parts 41 higher in rigidity than the plastic deformation parts 40 are formed between the plastic deformation parts 40 adjacent in the shaft line direction and between the plastic deformation parts 40 adjacent in the circumferential direction.SELECTED DRAWING: Figure 1

Description

本発明は、電動ドライバーや、空圧式のドライバー等の作動工具に取り付けてねじを締緩するドライバービットに関する。 The present invention relates to a screwdriver bit that is attached to a working tool such as an electric screwdriver or a pneumatic screwdriver to tighten and loosen a screw.

上記のドライバービットとして、例えば、特許文献１に開示されているような、軸状に形成されており、軸線方向における一端部にはねじの頭部に形成されている溝に挿入する刃部が形成され、且つ軸線方向における他端部が作動工具に装着可能に構成されたものが知られている。 As the above driver bit, for example, as disclosed in Patent Document 1, a blade portion is formed in a shaft shape, and one end portion in the axial direction is inserted into a groove formed in a screw head. It is known that the other end in the axial direction is formed so that it can be attached to a working tool.

また、上記ドライバービットには、前記一端部及び前記他端部の一方から他方に伝わる衝撃を抑えるためのシャフト部分が形成されており、このシャフト部分は、前記一端部及び前記他端部よりも硬度が低くなっている。 Further, the driver bit is formed with a shaft portion for suppressing an impact transmitted from one of the one end portion and the other end portion to the other, and this shaft portion is larger than the one end portion and the other end portion. The hardness is low.

かかるドライバービットでは、例えば、ねじの回転が止まったとき（例えば、ねじを締めきったとき）に、前記一端部側では回転が阻害される一方、前記他端部側では作動工具から回転力が加わり続けるため、刃部にかかる負荷（応力）が高まる。このとき、シャフト部分が可塑的にねじれ変形するため、作動工具から加わる回転力がシャフト部分によって吸収される結果、前記一端部側（刃部）に伝わる回転力が抑えられる。 In such a driver bit, for example, when the rotation of the screw is stopped (for example, when the screw is tightened), the rotation is hindered on the one end side, while the rotational force is applied from the operating tool on the other end side. Since it continues to be applied, the load (stress) applied to the blade increases. At this time, since the shaft portion is plastically twisted and deformed, the rotational force applied from the operating tool is absorbed by the shaft portion, and as a result, the rotational force transmitted to the one end portion side (blade portion) is suppressed.

従って、前記ドライバービットは、刃部に過剰な回転力が伝わることを防止することで、刃部の破損を防止できる（すなわち、耐久性が高まる）とされている。 Therefore, it is said that the driver bit can prevent the blade portion from being damaged (that is, the durability is enhanced) by preventing the excessive rotational force from being transmitted to the blade portion.

特表平８−５０４６８５号公報Special Table No. 8-504685

ところで、上述従来のドライバービットでは、シャフト部分全体が可塑的にねじれ変形するように構成されているため、シャフト部分の耐久性が低くなることが問題となっている。そのため、上述従来のドライバービットには、シャフト部分を含め各部の耐久性を高めることによって寿命を向上させることが望まれている。 By the way, in the above-mentioned conventional driver bit, since the entire shaft portion is configured to be plastically twisted and deformed, there is a problem that the durability of the shaft portion is lowered. Therefore, it is desired that the above-mentioned conventional driver bit has an improved life by increasing the durability of each part including the shaft part.

そこで、本発明は、斯かる実情に鑑み、ドライバービットの寿命を向上させることができるドライバービットを提供することを課題とする。 Therefore, in view of such circumstances, it is an object of the present invention to provide a driver bit capable of improving the life of the driver bit.

本発明のドライバービットは、
軸状に形成されるドライバービットであって、
前記ドライバービット自身の軸線方向における一端部と他端部との間に設けられる緩衝軸部を備え、
前記緩衝軸部の外表面には、該緩衝軸部自身の径方向内側に向かって凹状に凹み且つ互いに非連続である複数の塑性変形部が形成され、
前記複数の塑性変形部は、前記軸線方向、及び前記ドライバービットの中心線を中心とする周方向において整列し、
前記軸線方向において隣り合う前記塑性変形部の間、及び前記周方向において隣り合う前記塑性変形部の間には、前記塑性変形部よりも剛性が高い高剛性部が形成される。 The driver bit of the present invention is
A screwdriver bit formed in a shaft shape
A buffer shaft portion provided between one end portion and the other end portion in the axial direction of the driver bit itself is provided.
On the outer surface of the buffer shaft portion, a plurality of plastic deformed portions that are concavely recessed inward in the radial direction of the buffer shaft portion itself and are discontinuous with each other are formed.
The plurality of plastic deformed portions are aligned in the axial direction and the circumferential direction centered on the center line of the driver bit.
A high-rigidity portion having a higher rigidity than the plastic deformed portion is formed between the plastic deformed portions adjacent to each other in the axial direction and between the plastic deformed portions adjacent to each other in the circumferential direction.

また、本発明のドライバービットにおいて、
前記高剛性部は、前記緩衝軸部の外表面を独立した複数の領域に区画するように構成され、前記複数の塑性変形部は、それぞれが異なる前記領域に形成されていてもよい。 Further, in the driver bit of the present invention,
The high-rigidity portion is configured to partition the outer surface of the buffer shaft portion into a plurality of independent regions, and the plurality of plastically deformed portions may be formed in different regions.

本発明のドライバービットにおいて、
前記高剛性部には、
前記複数の塑性変形部の間に形成され、且つ前記軸線方向、及び前記ドライバービットの中心線を中心とする周方向において整列する複数の面領域と、
前記軸線方向で隣り合う面領域同士に繋がる第一稜線部と、
前記周方向で隣り合う面領域同士に繋がる第二稜線部と、が含まれていてもよい。 In the driver bit of the present invention
The high-rigidity portion has
A plurality of surface regions formed between the plurality of plastic deformation portions and aligned in the axial direction and in the circumferential direction centered on the center line of the driver bit.
The first ridge line portion connecting the adjacent surface regions in the axial direction and
A second ridge line portion connecting to the adjacent surface regions in the circumferential direction may be included.

以上のように、本発明のドライバービットによれば、刃部と緩衝軸部との耐久性を高めることによって、ドライバービットの寿命を向上させることができるという優れた効果を奏し得る。 As described above, according to the driver bit of the present invention, it is possible to achieve an excellent effect that the life of the driver bit can be improved by increasing the durability of the blade portion and the buffer shaft portion.

図１は、本発明の一実施形態に係るドライバービットの外観図である。FIG. 1 is an external view of a driver bit according to an embodiment of the present invention. 図２は、同実施形態に係るドライバービットの緩衝軸部の拡大図である。FIG. 2 is an enlarged view of the buffer shaft portion of the driver bit according to the embodiment. 図３は、同実施形態に係るドライバービットの使用状態の説明図である。FIG. 3 is an explanatory diagram of a usage state of the driver bit according to the embodiment. 図４は、本発明の他実施形態に係るドライバービットの拡大図である。FIG. 4 is an enlarged view of a driver bit according to another embodiment of the present invention. 図５は、本発明の別の実施形態に係るドライバービットの拡大図である。FIG. 5 is an enlarged view of a driver bit according to another embodiment of the present invention. 図６は、本発明のさらに別の実施形態に係るドライバービットの拡大図である。FIG. 6 is an enlarged view of a driver bit according to still another embodiment of the present invention. 図７は、本発明のさらに別の実施形態に係るドライバービットの拡大図である。FIG. 7 is an enlarged view of a driver bit according to still another embodiment of the present invention. 図８は、本発明のさらに別の実施形態に係るドライバービットの拡大図である。FIG. 8 is an enlarged view of a driver bit according to still another embodiment of the present invention.

以下、本発明の一実施形態に係るドライバービットについて添付図面を参照しつつ説明を行う。本実施形態に係るドライバービットは、電動ドライバーや、空圧式のドライバー等の作動工具（すなわち、ドライバービットを回転させる動力を発生させるように構成された工具）に取り付けてねじを締緩するものである。 Hereinafter, the driver bit according to the embodiment of the present invention will be described with reference to the accompanying drawings. The driver bit according to the present embodiment is attached to an operating tool such as an electric screwdriver or a pneumatic screwdriver (that is, a tool configured to generate power to rotate the driver bit) to tighten and loosen the screw. is there.

本実施形態に係るドライバービットは、図１に示すように、軸状である。そして、ドライバービット１は、該ドライバービット１自身の軸線方向における一端部２と、前記軸線方向における他端部３と、該一端部２と他端部３との間に形成される緩衝軸部４と、を有する。 As shown in FIG. 1, the driver bit according to the present embodiment has a shaft shape. The driver bit 1 is a cushioning shaft portion formed between one end portion 2 in the axial direction of the driver bit 1 itself, the other end portion 3 in the axial direction, and the one end portion 2 and the other end portion 3. 4 and.

ドライバービット１では、前記一端部２及び前記他端部３の少なくとも一方の端部に対して、ねじを回転操作するための刃部５が形成されている。刃部５は、ドライバービット１の中心側（径方向における中心側）から径方向における外方（以下、径方向外方と称する）に向かって延出し、且つ前記軸線方向において直線状に細長く延びている。 In the driver bit 1, a blade portion 5 for rotating a screw is formed on at least one end of the one end 2 and the other end 3. The blade portion 5 extends from the center side (center side in the radial direction) of the driver bit 1 toward the outside in the radial direction (hereinafter, referred to as the outward in the radial direction), and extends linearly in the axial direction. ing.

なお、刃部５の数や、刃部５を形成する位置は、操作対象となるねじの種類に応じて適宜設定すればよいが、例えば、回転操作する対象のねじがプラスねじである場合、ドライバービット１の端部には、４つの刃部５が形成され、回転操作する対象のねじがマイナスねじである場合、ドライバービット１の端部には、２つの刃部５が形成される。 The number of blades 5 and the position where the blades 5 are formed may be appropriately set according to the type of screw to be operated. For example, when the screw to be rotated is a Phillips screw. Four blades 5 are formed at the end of the driver bit 1, and when the screw to be rotated is a slotted screw, two blades 5 are formed at the end of the driver bit 1.

本実施形態のドライバービット１では、前記一端部２のみに刃部５が形成されている。これに伴い、ドライバービット１は、前記他端部３のみが作動工具に対して着脱可能に構成されている。前記他端部３は、作動工具のチャック内に挿入できる外径で形成されており、さらに、外形が多角形状になっている。 In the driver bit 1 of the present embodiment, the blade portion 5 is formed only on the one end portion 2. Along with this, the driver bit 1 is configured such that only the other end 3 is detachable from the operating tool. The other end 3 is formed with an outer diameter that can be inserted into the chuck of the operating tool, and further has a polygonal outer shape.

緩衝軸部４は、図２に示すように、前記径方向における内方（以下、径方向内方と称する）に向かって凹む凹部によって構成される複数の塑性変形部４０と、該塑性変形部４０よりも剛性が高い高剛性部４１とを有する。なお、塑性変形部４０は、凹状に形成されているため、高剛性部４１よりも薄肉になる（径方向での寸法が細くなる）。このように、緩衝軸部４では、塑性変形部４０の厚みと高剛性部４１の厚みとに差をつけることによって、塑性変形部４０の強度を高剛性部４１の強度よりも下げている（すなわち、塑性変形部４０が高剛性部４１よりも塑性変形し易くなるように構成している）。 As shown in FIG. 2, the buffer shaft portion 4 includes a plurality of plastic deformed portions 40 formed of recesses recessed inward in the radial direction (hereinafter referred to as radial inward), and the plastic deformed portion 40. It has a high-rigidity portion 41 having a rigidity higher than 40. Since the plastically deformed portion 40 is formed in a concave shape, it is thinner than the high-rigidity portion 41 (the dimension in the radial direction becomes thinner). In this way, in the buffer shaft portion 4, the strength of the plastic deformed portion 40 is made lower than the strength of the high rigid portion 41 by making a difference between the thickness of the plastic deformed portion 40 and the thickness of the highly rigid portion 41 ( That is, the plastically deformed portion 40 is configured to be more easily plastically deformed than the high-rigidity portion 41).

塑性変形部４０は、ドライバービット１に加わるトルクが集中するように構成された部分であり、ドライバービット１に過剰なトルクが加わった際に塑性変形することによって、刃部５に加わる負荷を抑制できるようになっている。 The plastic deformation portion 40 is a portion configured so that the torque applied to the driver bit 1 is concentrated, and the load applied to the blade portion 5 is suppressed by plastically deforming when an excessive torque is applied to the driver bit 1. You can do it.

本実施形態に係る塑性変形部４０は、直線状に延びる底部４００と、該底部４００の両側に隣接する（連続する）傾斜部４０１とを有する。 The plastically deformed portion 40 according to the present embodiment has a bottom portion 400 extending linearly and inclined portions 401 adjacent (continuous) on both sides of the bottom portion 400.

底部４００は、前記軸線方向に直交する直交方向に沿って延びている。また、底部４００は、前記軸線方向における塑性変形部４０の中央部に形成されている。さらに、底部４００の両端は、何れも塑性変形部４０の外縁部に到達している。すなわち、底部４００は、前記直交方向における塑性変形部４０の幅方向全長に亘って延びている。 The bottom portion 400 extends along an orthogonal direction orthogonal to the axial direction. Further, the bottom portion 400 is formed at the central portion of the plastic deformation portion 40 in the axial direction. Further, both ends of the bottom portion 400 reach the outer edge portion of the plastic deformation portion 40. That is, the bottom portion 400 extends over the entire length in the width direction of the plastic deformation portion 40 in the orthogonal direction.

傾斜部４０１は、前記軸線方向において底部４００から離れるにつれて、緩衝軸部４自身の径方向外方に向かうように傾斜しており、本実施形態では、傾斜した平坦面によって構成されている。 The inclined portion 401 is inclined so as to move outward in the radial direction of the buffer shaft portion 4 itself as it is separated from the bottom portion 400 in the axial direction, and in the present embodiment, it is composed of an inclined flat surface.

さらに、傾斜部４０１は、前記軸線方向において底部４００から離れるにつれて横幅が小さくなるように形成されており、本実施形態では、先細りとなるように形成されている。すなわち、本実施形態の傾斜部４０１は三角形状である。 Further, the inclined portion 401 is formed so that the lateral width becomes smaller as the distance from the bottom portion 400 in the axial direction increases, and in the present embodiment, the inclined portion 401 is formed so as to be tapered. That is, the inclined portion 401 of the present embodiment has a triangular shape.

また、一方の傾斜部４０１と他方の傾斜部４０１とは、底部４００を境として対称（前記軸線方向において対称）の形状であるため、塑性変形部４０は全体として菱形状に形成されている。 Further, since the one inclined portion 401 and the other inclined portion 401 have a symmetrical shape (symmetrical in the axial direction) with the bottom portion 400 as a boundary, the plastic deformed portion 40 is formed in a rhombic shape as a whole.

ここで、緩衝軸部４には、複数の塑性変形部４０が形成されているが、この複数の塑性変形部４０は、前記軸線方向で隣接した状態で並び、且つ前記周方向においては互いの底部４００が隣接した状態で並んでいる。すなわち、複数の塑性変形部４０は、前記軸線方向と前記周方向において整列している。 Here, a plurality of plastic deformed portions 40 are formed on the buffer shaft portion 4, and the plurality of plastic deformed portions 40 are arranged in a state of being adjacent to each other in the axial direction and are mutually arranged in the circumferential direction. The bottoms 400 are lined up adjacent to each other. That is, the plurality of plastic deformation portions 40 are aligned in the axial direction and the circumferential direction.

なお、本実施形態では、前記軸線方向で隣り合う塑性変形部４０の外周縁部同士が隣接している。より具体的に説明すると、前記軸線方向において隣り合う塑性変形部４０は、互いの傾斜部４０１の先端（頂部）が隣接するように構成されている。これに伴い、前記軸線方向で隣り合う一対の傾斜部４０１の間には山なりの稜線部（以下、第一稜線部と称する）４２が形成されている。 In the present embodiment, the outer peripheral edges of the plastically deformed portions 40 adjacent to each other in the axial direction are adjacent to each other. More specifically, the plastically deformed portions 40 adjacent to each other in the axial direction are configured so that the tips (tops) of the inclined portions 401 are adjacent to each other. Along with this, a mountainous ridge line portion (hereinafter, referred to as a first ridge line portion) 42 is formed between the pair of inclined portions 401 adjacent to each other in the axial direction.

また、前記周方向において隣り合う塑性変形部４０は、互いの底部４００の端部が隣接するように構成されており、それぞれの底部４００が隣接することによって、前記周方向で隣り合う一対の底部４００の間には山なりの稜線部（以下、第二稜線部と称する）４３が形成されている。 Further, the plastically deformed portions 40 adjacent to each other in the circumferential direction are configured so that the ends of the bottom portions 400 are adjacent to each other, and the bottom portions 400 are adjacent to each other, so that the pair of bottom portions adjacent to each other in the circumferential direction A mountainous ridge (hereinafter referred to as a second ridge) 43 is formed between the 400s.

さらに、塑性変形部４０の間には、面領域４４が形成されている。なお、本実施形態に係る面領域４４は平坦であるが、径方向外方に向かって膨らむように湾曲していてもよい。 Further, a surface region 44 is formed between the plastic deformation portions 40. Although the surface region 44 according to the present embodiment is flat, it may be curved so as to bulge outward in the radial direction.

高剛性部４１は、第一稜線部４２と、第二稜線部４３と、面領域４４とで構成されている。 The high-rigidity portion 41 is composed of a first ridge line portion 42, a second ridge line portion 43, and a surface region 44.

そのため、前記軸線方向において隣り合う塑性変形部４０の間、及び前記周方向において隣り合う塑性変形部４０の間には、高剛性部４１が形成されている。 Therefore, the high-rigidity portion 41 is formed between the plastic deformed portions 40 adjacent to each other in the axial direction and between the plastic deformed portions 40 adjacent to each other in the circumferential direction.

また、第一稜線部４２と、第二稜線部４３と、面領域４４とは、互いに連続するように構成されている。そのため、高剛性部４１は、網目状（メッシュ状）に形成されている。 Further, the first ridge line portion 42, the second ridge line portion 43, and the surface region 44 are configured to be continuous with each other. Therefore, the high-rigidity portion 41 is formed in a mesh shape (mesh shape).

これにより、緩衝軸部４には、高剛性部４１によって独立した複数の領域が区画されており、かかる領域の一つ一つに塑性変形部４０が形成されている。そのため、各塑性変形部４０は、周囲が高剛性部４１によって取り囲まれており、互いに非連続である。 As a result, a plurality of independent regions are partitioned by the high-rigidity portion 41 in the buffer shaft portion 4, and a plastic deformation portion 40 is formed in each of these regions. Therefore, each of the plastically deformed portions 40 is surrounded by a high-rigidity portion 41 and is discontinuous with each other.

本実施形態に係るドライバービット１の構成は以上の通りである。本実施形態のドライバービット１によれば、緩衝軸部４には前記径内側に向かって凹む複数の塑性変形部４０が形成されているため、外力（例えば、作動工具から加えられた回転力）が加わると、各塑性変形部４０が塑性変形することにより、刃部５に伝わる外力（すなわち、刃部５にかかる負荷）が低減される。 The configuration of the driver bit 1 according to the present embodiment is as described above. According to the driver bit 1 of the present embodiment, since the buffer shaft portion 4 is formed with a plurality of plastically deformed portions 40 recessed inward in diameter, an external force (for example, a rotational force applied from the operating tool) is formed. Is applied, each plastically deformed portion 40 is plastically deformed, so that the external force transmitted to the blade portion 5 (that is, the load applied to the blade portion 5) is reduced.

ドライバービット１の使用例を挙げて説明すると、例えば、図３に示すように、ドライバービット１の前記他端部３を作動工具ＴのチャックＴ１に装着する場合、ドライバービット１の前記一端部２の刃部５をねじＳの頭部Ｓ１に形成されている溝に挿し込み、作動工具Ｔを駆動させることによってドライバービット１を前記軸線方向を中心とする周方向で回転させる。 For example, as shown in FIG. 3, when the other end 3 of the driver bit 1 is attached to the chuck T1 of the operating tool T, the one end 2 of the driver bit 1 will be described with reference to an example of using the driver bit 1. The driver bit 1 is rotated in the circumferential direction centered on the axial direction by inserting the blade portion 5 of the screw S into the groove formed in the head portion S1 of the screw S and driving the operating tool T.

そして、ねじＳの回転が止まった場合（例えば、ねじＳを締めきった場合）、前記一端部２側では回転が阻害される一方、前記他端部３側には作動工具Ｔから回転力が加わり続けるため、刃部５にかかる負荷（すなわち、前記周方向において刃部５をねじＳに押し付ける力）が高まる。このとき、作動工具Ｔから加わる回転力が各塑性変形部４０の塑性変形によって吸収される結果、前記一端部２に設けられている刃部５に伝わる回転力が低減され、刃部５にかかる負荷も低減される。 When the rotation of the screw S is stopped (for example, when the screw S is tightened), the rotation is hindered on the one end 2 side, while the rotational force is applied from the operating tool T on the other end 3 side. Since the force continues to be applied, the load applied to the blade portion 5 (that is, the force for pressing the blade portion 5 against the screw S in the circumferential direction) increases. At this time, as a result of the rotational force applied from the operating tool T being absorbed by the plastic deformation of each plastic deformation portion 40, the rotational force transmitted to the blade portion 5 provided at the one end portion 2 is reduced and applied to the blade portion 5. The load is also reduced.

また、緩衝軸部４では、複数の塑性変形部４０のそれぞれに応力が集中するため、緩衝軸部４に生じる応力が各塑性変形部４０に分散される。そのため、緩衝軸部４も破損し難くなる。 Further, in the buffer shaft portion 4, stress is concentrated on each of the plurality of plastic deformed portions 40, so that the stress generated in the buffer shaft portion 4 is dispersed in each of the plastic deformed portions 40. Therefore, the buffer shaft portion 4 is also less likely to be damaged.

このように、ドライバービット１は、各塑性変形部４０の塑性変形によって前記一端部２から前記他端部３、又は前記他端部３から前記一端部２に伝わる衝撃が抑えられるため、刃部５と緩衝軸部４との耐久性を高めることによって、刃部５の破損を防止しつつドライバービット１の寿命を向上させることができるという優れた効果を奏し得る。 As described above, in the driver bit 1, the impact transmitted from the one end portion 2 to the other end portion 3 or from the other end portion 3 to the one end portion 2 due to the plastic deformation of each plastic deformation portion 40 is suppressed, so that the blade portion By increasing the durability between the 5 and the buffer shaft portion 4, it is possible to achieve an excellent effect that the life of the driver bit 1 can be improved while preventing the blade portion 5 from being damaged.

また、本実施形態に係るドライバービット１では、塑性変形部４０の底部４００が直線状に形成されているため、塑性変形部４０に生じた応力が各塑性変形部に分散し易くなり、これにより、刃部５及び緩衝軸部４の破損を抑制する効果が高まる。 Further, in the driver bit 1 according to the present embodiment, since the bottom portion 400 of the plastic deformed portion 40 is formed in a linear shape, the stress generated in the plastic deformed portion 40 is easily dispersed in each plastic deformed portion. , The effect of suppressing damage to the blade portion 5 and the buffer shaft portion 4 is enhanced.

さらに、緩衝軸部４に設けられている複数の塑性変形部４０は、前記軸線方向及び前記周方向において整列しているため、緩衝軸部４における応力集中する場所が均一又は略均一に分散されることによって、緩衝軸部４の部分的な破損を抑えることもできる。 Further, since the plurality of plastic deformation portions 40 provided on the buffer shaft portion 4 are aligned in the axial direction and the circumferential direction, the stress concentration locations on the buffer shaft portion 4 are uniformly or substantially uniformly dispersed. As a result, partial damage to the buffer shaft portion 4 can be suppressed.

また、前記軸線方向においては、複数の塑性変形部４０が隣接した状態で並んでいるため、緩衝軸部４の外表面が前記軸線方向において波形状になり、前記軸線方向において緩衝軸部４の外表面に沿った距離が長くなる。 Further, in the axial direction, since the plurality of plastic deformation portions 40 are arranged adjacent to each other, the outer surface of the buffer shaft portion 4 has a wavy shape in the axial direction, and the buffer shaft portion 4 has a wavy shape in the axial direction. The distance along the outer surface becomes longer.

そのため、回転させているねじＳからドライバービット１の前記一端部２側（刃部５側）に伝わる振動が前記他端部３側に伝わり難くなる。従って、ねじＳを回転させている最中に作動工具Ｔや、使用者の手元がぶれ難くなる。 Therefore, the vibration transmitted from the rotating screw S to the one end 2 side (blade 5 side) of the driver bit 1 is less likely to be transmitted to the other end 3 side. Therefore, the operating tool T and the user's hand are less likely to shake while the screw S is being rotated.

さらに、本実施形態では、前記軸線方向において隣り合う塑性変形部４０の間に形成されている高剛性部４１と、前記周方向において隣り合う塑性変形部４０の間に形成されている高剛性部４１とが互いに連続するように構成されている、すなわち、高剛性部４１がメッシュ状に形成されているため、複数の塑性変形部４０の各々の周囲が高剛性部４１によって取り囲まれている。 Further, in the present embodiment, the high-rigidity portion 41 formed between the plastic deformation portions 40 adjacent to each other in the axial direction and the high-rigidity portion 40 formed between the plastic deformation portions 40 adjacent to each other in the circumferential direction. Since the high-rigidity portion 41 is formed in a mesh shape so that the 41 and the 41 are continuous with each other, each of the plurality of plastic deformation portions 40 is surrounded by the high-rigidity portion 41.

そのため、緩衝軸部４に生じる応力が各塑性変形部４０に分散し易くなる結果、緩衝軸部４における応力が高まり易くなる領域が各塑性変形部４０に制限されることによって、緩衝軸部４の破損を抑制する効果がさらに高まる。 Therefore, as a result of the stress generated in the buffer shaft portion 4 being easily dispersed in each plastic deformed portion 40, the region in which the stress in the buffer shaft portion 4 is likely to increase is limited to each plastic deformed portion 40, so that the buffer shaft portion 4 is easily dispersed. The effect of suppressing damage is further enhanced.

なお、本発明のドライバービット１は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々の変更を加え得ることは勿論である。 It should be noted that the driver bit 1 of the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

上記実施形態において、塑性変形部４０の傾斜部４０１は、三角形状であったが、図４，５に示すように、台形状であってもよいし、また、半円状であってもよい。 In the above embodiment, the inclined portion 401 of the plastic deformation portion 40 has a triangular shape, but as shown in FIGS. 4 and 5, it may have a trapezoidal shape or a semicircular shape. ..

上記実施形態では、塑性変形部４０の傾斜部４０１は、平坦な面であったが、この構成に限定されない。例えば、図６に示すように、塑性変形部４０の傾斜部４０１は、湾曲した面であってもよい。 In the above embodiment, the inclined portion 401 of the plastic deformation portion 40 has a flat surface, but the present invention is not limited to this configuration. For example, as shown in FIG. 6, the inclined portion 401 of the plastic deformation portion 40 may be a curved surface.

上記実施形態において、底部４００は、直線状であり且つ前記直交向に沿って延びていたが、この構成に限定されない。例えば、底部４００は、前記軸線方向に沿って延びるように形成したり、前記直交方向に対して交差する方向に沿って延びるように形成されていてもよい。 In the above embodiment, the bottom 400 is straight and extends along the orthogonal direction, but is not limited to this configuration. For example, the bottom portion 400 may be formed so as to extend along the axial direction, or may be formed so as to extend along a direction intersecting the orthogonal direction.

上記実施形態において、前記周方向で隣り合う傾斜部４０１の外縁は、互いに離間していたが、この構成に限定されない。例えば、前記周方向で隣り合う傾斜部４０１の外縁は、図７，８に示すように、前記周方向で隣り合う傾斜部４０１の外縁は、互いに隣接していてもよい。 In the above embodiment, the outer edges of the inclined portions 401 adjacent to each other in the circumferential direction are separated from each other, but the present invention is not limited to this configuration. For example, as shown in FIGS. 7 and 8, the outer edges of the inclined portions 401 adjacent to each other in the circumferential direction may be adjacent to each other.

上記実施形態において、複数の塑性変形部４０は、前記軸線方向においては、真っ直ぐに並んでいたが、この構成に限定されない。例えば、複数の塑性変形部４０は、図８に示すように、前記周方向に位置ずれしながら前記軸線方向において並ぶように形成されていてもよい。 In the above embodiment, the plurality of plastic deformed portions 40 are arranged in a straight line in the axial direction, but the present invention is not limited to this configuration. For example, as shown in FIG. 8, the plurality of plastic deformation portions 40 may be formed so as to be aligned in the axial direction while being displaced in the circumferential direction.

上記実施形態において、ドライバービット１は、軸線方向における前記一端部２に刃部５が形成され、軸線方向における前記他端部３が作動工具Ｔに装着可能であったが、この構成に限定されない。例えば、ドライバービット１は、軸線方向における前記一端部２と前記他端部３に刃部５が形成され、軸線方向における前記一端部２と前記他端部３とが作動工具Ｔに装着可能であってもよい（いわゆる、両頭であってもよい）。すなわち、ドライバービット１は、軸線方向における前記一端部２と前記他端部３とのうちの少なくとも一方の端部に刃部５が形成され、軸線方向における前記一端部２と前記他端部３とのうちの少なくとも他方の端部が作動工具Ｔに装着可能であればよい。 In the above embodiment, the driver bit 1 is not limited to this configuration, although the blade portion 5 is formed at the one end portion 2 in the axial direction and the other end portion 3 in the axial direction can be attached to the operating tool T. .. For example, in the driver bit 1, a blade portion 5 is formed on the one end portion 2 and the other end portion 3 in the axial direction, and the one end portion 2 and the other end portion 3 in the axial direction can be attached to the operating tool T. It may be (so-called double-headed). That is, the driver bit 1 has a blade portion 5 formed at at least one end of the one end portion 2 and the other end portion 3 in the axial direction, and the one end portion 2 and the other end portion 3 in the axial direction. It suffices if at least the other end of the above can be attached to the operating tool T.

１…ドライバービット、２…一端部、３…他端部、４…緩衝軸部、５…刃部、４０…塑性変形部、４１…高剛性部、４２…第一稜線部、４３…第二稜線部、４４…面領域、４００…底部、４０１…傾斜部、Ｔ…作動工具 1 ... Driver bit, 2 ... One end, 3 ... The other end, 4 ... Buffer shaft, 5 ... Blade, 40 ... Plastic deformation, 41 ... High rigidity, 42 ... First ridge, 43 ... Second Ridge line part, 44 ... surface area, 400 ... bottom part, 401 ... inclined part, T ... operating tool

Claims

A screwdriver bit formed in a shaft shape
A buffer shaft portion provided between one end portion and the other end portion in the axial direction of the driver bit itself is provided.
On the outer surface of the buffer shaft portion, a plurality of plastic deformed portions that are concavely recessed inward in the radial direction of the buffer shaft portion itself and are discontinuous with each other are formed.
The plurality of plastic deformed portions are aligned in the axial direction and the circumferential direction centered on the center line of the driver bit.
A driver bit in which a high-rigidity portion having a higher rigidity than the plastic deformed portion is formed between the plastic deformed portions adjacent to each other in the axial direction and between the plastic deformed portions adjacent to each other in the circumferential direction.

The first aspect of claim 1, wherein the high-rigidity portion is configured to partition the outer surface of the buffer shaft portion into a plurality of independent regions, and the plurality of plastically deformed portions are formed in different regions. Driver bit.

The high-rigidity portion has
A plurality of surface regions formed between the plurality of plastic deformation portions and aligned in the axial direction and in the circumferential direction centered on the center line of the driver bit.
The first ridge line portion connecting the adjacent surface regions in the axial direction and
The driver bit according to claim 2, further comprising a second ridge line portion connected to adjacent surface regions in the circumferential direction.