JP3852089B2 - Screw and screwdriver bit - Google Patents

Screw and screwdriver bit Download PDF

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Publication number
JP3852089B2
JP3852089B2 JP2001324589A JP2001324589A JP3852089B2 JP 3852089 B2 JP3852089 B2 JP 3852089B2 JP 2001324589 A JP2001324589 A JP 2001324589A JP 2001324589 A JP2001324589 A JP 2001324589A JP 3852089 B2 JP3852089 B2 JP 3852089B2
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Prior art keywords
screw
bit
fitting groove
rotation direction
driver bit
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JP2003130022A (en
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廣吉 内山
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廣吉 内山
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Description

【０００１】
【発明の属する技術分野】
本発明は例えば各種部材の締結機械要素としてのプラスねじ、マイナスねじ等の各種のねじ及びドライバービットに関するものである。
【０００２】
【従来の技術】
従来この種のねじ及びドライバービットとして、ねじの頭部にドライバービットの刃部が嵌脱可能なプラスやマイナス状のビット嵌合溝を形成したものが知られている。
【０００３】
しかして、ドライバービットの刃部をビット嵌合溝に嵌合し、ドライバービットを回動することによりねじを締め付けたり、反対方向に回動することによりねじを緩めることになる。
【０００４】
【発明が解決しようとする課題】
しかしながら上記ねじとドライバービットとの組み合わせによれば、刃部とビット嵌合溝とはテーパー接触であり、絞め付け時にドライバービットを軸線方向に押圧しつつ回動することになり、この軸線方向の押圧力が小さいとビット嵌合溝から刃部が外方に飛び出す、いわゆるカムアウト現象が生ずることがあり、このため、作業者はねじ締め時にドライバービットにより継続してねじを強く押圧していなければならず、それだけ、作業者に労苦を強いることがあると共に作業性を低下させることがあるという不都合を有している。
【０００５】
【課題を解決するための手段】
本発明はこのような課題を解決することを目的とするもので、本発明のうちで、請求項１記載の発明は、ねじ頭部にドライバービットの刃部が嵌脱可能なビット嵌合溝を備えてなり、上記ビット嵌合溝の底部に上記刃部の先端部に形成された嵌入凸部が嵌入可能なねじ回動方向前方に向いて没入した嵌入凹部を形成し、該嵌入凹部の上側内面を上記ビット嵌合溝の底に向かうに従って次第にねじ回動方向前方に行く螺旋面に形成してなることを特徴とするねじである。
【０００６】
又、請求項２記載の発明は、ねじ頭部のビット嵌合溝に嵌脱可能な刃部を備えてなり、上記刃部の先端部に上記ビット嵌合溝の底部にねじ回動方向前方に向いて没入して形成された嵌入凹部に嵌入可能な嵌入凸部を形成し、該嵌入凸部のねじ回動方向前側面を上記ビット嵌合溝の底に向かうに従って次第にねじ回動方向前方に行く螺旋面に形成してなることを特徴とするドライバービットにある。
【０００７】
【発明の実施の形態】
図１乃至図６は本発明の実施の形態例を示し、図１乃至図３は第一形態例、図４乃至図６は第二形態例である。
【０００８】
図１乃至図３の第一形態例において、Ｓはねじであり、この場合、ねじ頭部１にドライバービットＢのプラス状の四個の刃部２が嵌脱可能なプラス溝状の四個のビット嵌合溝３を備えてなり、この四個のビット嵌合溝３の底部にそれぞれ刃部２の先端部に形成された嵌入凸部４が嵌入可能なねじ回動方向Ｒ前方に向いて没入した四個の嵌入凹部５を形成して構成している。
【０００９】
又、この場合、上記各嵌入凹部５の上側内面を上記ビット嵌合溝３の底に向かうに従って次第にねじ回動方向前方に行く螺旋面５ａに形成している。
【００１０】
Ｂはドライバービットであり、ねじ頭部１のプラス溝状のビット嵌合溝３に嵌脱可能なプラス状の四個の刃部２を備えてなり、この各刃部２の先端部にビット嵌合溝３の底部にねじ回動方向Ｒ前方に向いて没入して形成された嵌入凹部５に嵌入可能な嵌入凸部４を四個形成して構成している。この際、ドライバービットＢに磁気作用を付加して置くことにより、ドライバービットＢにねじＳが磁着され、ねじ締め開始時の作業性を高めることができる。
【００１１】
又、この場合、上記嵌入凸部４のねじ回動方向Ｒ前側面を上記ビット嵌合溝３の底に向かうに従って次第にねじ回動方向前方に行く螺旋面４ａに形成して構成している。
【００１２】
この実施の第一形態例は上記構成であるから、ねじの締め付けに際し、ドライバービットＢの刃部２をビット嵌合溝３に嵌合し、ドライバービットＢをねじ回動方向Ｒに回動すると、ビット嵌合溝３の底部にねじ回動方向Ｒ前方に向いて没入して形成された嵌入凹部５に刃部２の先端部に形成された嵌入凸部４が嵌入し、このビット嵌合溝３に形成された嵌入凹部５にドライバービットＢの刃部２に形成された嵌入凸部４が嵌入した状態において、ドライバービットＢを外方に引き上げようとすると、ドライバービットＢの嵌入凸部４のねじ回動方向Ｒ前側面が嵌入凹部５の上側内面に当接係止し、この係止によりねじＳのビット嵌合溝３からのドライバービットＢの外方への飛び出し、いわゆるカムアウト現象を抑止することができ、作業者はねじ締め時にドライバービットを継続して強く押圧す必要がなくなり、ねじＳに対してドライバービットＢを姿勢保持するだけでよいことになり、それだけ、作業者の労苦を軽減することができると共に作業性を向上することができる。
【００１３】
又、この場合、上記嵌入凸部４のねじ回動方向Ｒ前側面を上記ビット嵌合溝３の底に向かうに従って次第にねじ回動方向前方に行く螺旋面４ａに形成し、上記各嵌入凹部５の上側内面を上記ビット嵌合溝３の底に向かうに従って次第にねじ回動方向前方に行く螺旋面５ａに形成しているから、ドライバービットＢの刃部２をビット嵌合溝３に嵌合し、ドライバービットＢをねじ回動方向Ｒに回動すると、ビット嵌合溝３の底部にねじ回動方向Ｒ前方に向いて没入して形成された嵌入凹部５に刃部２の先端部に形成された嵌入凸部４が嵌入し、このビット嵌合溝３に形成された嵌入凹部５にドライバービットＢの刃部２に形成された嵌入凸部４が嵌入した状態において、ドライバービットＢを外方に引き上げようとすると、ドライバービットＢの嵌入凸部４のねじ回動方向Ｒ前側面の弧状面４ａが嵌入凹部５の上側内面の弧状面５ａとが弧面接触状態で当接係止し、この弧状面接触によりドライバービットＢのねじ回動方向Ｒへの回動に伴ってドライバービットＢの刃部２をビット嵌合溝３の底部に向けて進入させようとすることになり、このため一層いわゆるカムアウト現象を抑止することができる。
【００１４】
図６乃至図９の第二形態例は別例構造を示し、この第二形態例において、Ｓはねじであり、この場合、ねじ頭部１にドライバービットＢのマイナス状の一個の刃部２が嵌脱可能なマイナス溝状の一個のビット嵌合溝３を備えてなり、この各ビット嵌合溝３の底部に刃部２の先端部両側に形成された二個の嵌入凸部４が嵌入可能なねじ回動方向Ｒ前方に向いて没入した嵌入凹部５を二個形成して構成している。
【００１５】
又、この場合、上記嵌入凹部５の上側内面を上記ビット嵌合溝３の底に向かうに従って次第にねじ回動方向前方に行く螺旋面５ａに形成している。
【００１６】
Ｂはドライバービットであり、ねじ頭部１のマイナス溝状のビット嵌合溝３に嵌脱可能なマイナス状の一個の刃部２を備えてなり、この各刃部２の先端部両側にビット嵌合溝３の底部にねじ回動方向Ｒ前方に向いて没入して形成された二個の嵌入凹部５に嵌入可能な嵌入凸部４を二個形成して構成している。
【００１７】
又、この場合、上記嵌入凸部４のねじ回動方向Ｒ前側面を上記ビット嵌合溝３の底に向かうに従って次第にねじ回動方向前方に行く螺旋面４ａに形成して構成している。
【００１８】
この実施の第二形態例は上記構成であるから、上記第一形態例と同様な作用効果を得ることができる。
【００１９】
尚、本発明は上記実施の形態例に限られるものではなく、上記実施の形態例ではドライバービット及びねじの形状や構造等は適宜変更して設計される。
【００２０】
又、他の実施の形態例として、上記第一及び第二形態例のビット嵌合溝３の底部の上記嵌入凹部５と反対側にも別の嵌入凹部を形成し、上記刃部２の先端部にこの別の嵌入凹部に嵌入可能な嵌入凸部を上記嵌入凸部４と反対側にも形成し、これによりねじを緩め回動するときにも、カムアウト現象を抑止するように構成してもよい。又、上記実施の形態例をプラス、マイナスねじ及びドライバービット以外の六角レンチや四角穴ねじや、六角レンチ、四角レンチ等にも適用することができる。又、上記第一形態例のねじＳのビット嵌合溝３の底面及びドライバービットＢの先端面は平坦面になっているが、一般的なねじＳのビット嵌合溝３の底面及びドライバービットＢの先端部の如く、先鋭な底面及び先鋭端部に形成し、一般的なドライバービットＢによってもねじ締め及び緩めが可能な構造とすることもある。
【００２１】
【発明の効果】
本発明は上述の如く、請求項１又は２記載の発明にあっては、ねじの締め付けに際し、ドライバービットの刃部をビット嵌合溝に嵌合し、ドライバービットをねじ回動方向に回動すると、ビット嵌合溝の底部にねじ回動方向前方に向いて没入して形成された嵌入凹部に刃部の先端部に形成された嵌入凸部が嵌入し、このビット嵌合溝に形成された嵌入凹部にドライバービットの刃部に形成された嵌入凸部が嵌入した状態において、ドライバービットを外方に引き上げようとすると、ドライバービットの嵌入凸部のねじ回動方向前側面が嵌入凹部の上側内面に当接係止し、この係止によりねじのビット嵌合溝からのドライバービットの外方への飛び出し、いわゆるカムアウト現象を抑止することができ、作業者はねじ締め時にドライバービットを継続して強く押圧す必要がなくなり、ねじに対してドライバービットを姿勢保持するだけでよいことになり、それだけ、作業者の労苦を軽減することができると共に作業性を向上することができ、かつ、上記嵌入凸部のねじ回動方向前側面を上記ビット嵌合溝の底に向かうに従って次第にねじ回動方向前方に行く螺旋面に形成し、上記各嵌入凹部の上側内面を上記ビット嵌合溝の底に向かうに従って次第にねじ回動方向前方に行く螺旋面に形成しているから、ドライバービットの刃部をビット嵌合溝に嵌合し、ドライバービットをねじ回動方向に回動すると、ビット嵌合溝の底部にねじ回動 方向前方に向いて没入して形成された嵌入凹部に刃部の先端部に形成された嵌入凸部が嵌入し、このビット嵌合溝に形成された嵌入凹部にドライバービットの刃部に形成された嵌入凸部が嵌入した状態において、ドライバービットを外方に引き上げようとすると、ドライバービットの嵌入凸部のねじ回動方向前側面の弧状面が嵌入凹部の上側内面の弧状面とが弧面接触状態で当接係止し、この弧状面接触によりドライバービットのねじ回動方向への回動に伴ってドライバービットの刃部をビット嵌合溝の底部に向けて進入させようとすることになり、このため一層いわゆるカムアウト現象を抑止することができる。
【００２２】
以上、所期の目的を充分達成することができる。
【図面の簡単な説明】
【図１】 本発明の実施の第一形態例の分解斜視図である。
【図２】 本発明の実施第一形態例のねじの平面図である。
【図３】 本発明の実施の第一形態例の部分拡大断面図である。
【図４】 本発明の実施の第二形態例の分解斜視図である。
【図５】 本発明の実施の第二形態例のねじの平面図である。
【図６】 本発明の実施の第二形態例の部分拡大断面図である。
【符号の説明】
１ ねじ頭部
２ 刃部
３ ビット嵌合溝
４ 嵌入凸部
４ａ 螺旋面
５ 嵌入凹部
５ａ 螺旋面
Ｓ ねじ
Ｂ ドライバービット
Ｒ 回動方向[0001]
BACKGROUND OF THE INVENTION
The present invention relates to various screws such as a plus screw and a minus screw as a fastening machine element for various members and a driver bit.
[0002]
[Prior art]
Conventionally, as this type of screw and driver bit, a screw having a plus or minus bit fitting groove in which the blade portion of the screwdriver bit can be fitted and removed is known.
[0003]
Thus, the screw bit of the driver bit is fitted into the bit fitting groove, and the screw is tightened by rotating the driver bit, or the screw is loosened by rotating in the opposite direction.
[0004]
[Problems to be solved by the invention]
However, according to the combination of the screw and the driver bit, the blade portion and the bit fitting groove are in a taper contact, and the screw is rotated while pressing the driver bit in the axial direction at the time of tightening. If the pressing force is small, a so-called cam-out phenomenon may occur in which the blade part protrudes outward from the bit fitting groove. For this reason, the operator must press the screw strongly with the driver bit when tightening the screw. Not only that, there are inconveniences that the labor may be forced and the workability may be lowered.
[0005]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. Among the present inventions, the invention according to claim 1 is a bit fitting groove in which a blade portion of a driver bit can be fitted to and detached from a screw head. An insertion recess recessed toward the front in the screw rotation direction in which the insertion protrusion formed at the tip of the blade portion can be inserted is formed at the bottom of the bit fitting groove, and the insertion recess The screw is characterized in that the upper inner surface is formed into a spiral surface that gradually goes forward in the screw rotation direction toward the bottom of the bit fitting groove .
[0006]
According to a second aspect of the present invention, there is provided a blade portion that can be fitted into and removed from the bit fitting groove of the screw head, and at the tip of the blade portion, the bottom portion of the bit fitting groove is forward in the screw rotation direction. An insertion convex portion that can be inserted into the insertion concave portion formed so as to be immersed in the groove is formed, and the front side surface of the insertion convex portion in the screw rotation direction is gradually advanced toward the bottom of the bit fitting groove. The screwdriver bit is characterized in that it is formed on a spiral surface going to.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 to 6 show an embodiment of the present invention, FIGS. 1 to 3 show a first embodiment, and FIGS. 4 to 6 show a second embodiment.
[0008]
In the first embodiment shown in FIGS. 1 to 3, S is a screw, and in this case, four plus-groove-shaped pieces in which four plus-shaped blade portions 2 of the driver bit B can be fitted to and detached from the screw head 1. The bit fitting grooves 3 are provided, and the bottoms of the four bit fitting grooves 3 are directed to the front of the screw rotation direction R in which the fitting protrusions 4 formed at the tip portions of the blade portions 2 can be respectively fitted. The four recessed recesses 5 that have been immersed are formed.
[0009]
In this case, the upper inner surface of each of the insertion recesses 5 is formed as a spiral surface 5a that gradually advances forward in the screw rotation direction toward the bottom of the bit fitting groove 3.
[0010]
B is a screwdriver bit, which is provided with four plus-shaped blade portions 2 that can be inserted into and removed from the plus-groove bit fitting groove 3 of the screw head 1, and a bit is provided at the tip of each blade portion 2. Four insertion convex portions 4 that can be inserted into the insertion concave portions 5 that are formed by immersing in the bottom of the fitting groove 3 toward the front of the screw rotation direction R are formed. At this time, by adding a magnetic action to the driver bit B, the screw S is magnetically attached to the driver bit B, and workability at the time of starting the screw tightening can be improved.
[0011]
In this case, the front side surface of the fitting protrusion 4 in the screw rotation direction R is formed as a spiral surface 4a that gradually goes forward in the screw rotation direction toward the bottom of the bit fitting groove 3.
[0012]
Since the first embodiment of the present embodiment has the above configuration, when the screw is tightened, the blade portion 2 of the driver bit B is fitted into the bit fitting groove 3 and the driver bit B is rotated in the screw rotation direction R. The fitting convex portion 4 formed at the tip of the blade portion 2 is fitted into the fitting concave portion 5 formed by immersing in the bottom of the bit fitting groove 3 toward the front of the screw rotation direction R, and this bit fitting. When the insertion convex portion 4 formed on the blade portion 2 of the driver bit B is inserted into the insertion concave portion 5 formed in the groove 3, when the driver bit B is pulled up, the insertion convex portion of the driver bit B 4, the front side surface of the screw rotation direction R abuts and engages with the upper inner surface of the insertion recess 5, and this engagement causes the screw S to protrude outward from the bit fitting groove 3, so-called camout phenomenon. Can deter working This eliminates the need to continue to press the driver bit strongly when tightening the screw, and it is only necessary to hold the posture of the driver bit B with respect to the screw S. Can be improved.
[0013]
Further, in this case, the front side surface of the insertion convex portion 4 in the screw rotation direction R is formed as a spiral surface 4a that gradually goes forward in the screw rotation direction toward the bottom of the bit fitting groove 3, and each insertion recess 5 Is formed in a spiral surface 5a that gradually advances forward in the screw rotation direction as it goes toward the bottom of the bit fitting groove 3, so that the blade portion 2 of the driver bit B is fitted into the bit fitting groove 3. When the driver bit B is rotated in the screw rotation direction R, the tip of the blade portion 2 is formed in the insertion recess 5 formed by immersing in the bottom of the bit fitting groove 3 toward the front of the screw rotation direction R. In the state in which the inserted protrusion 4 is inserted and the insertion protrusion 4 formed in the blade 2 of the driver bit B is inserted into the insertion recess 5 formed in the bit fitting groove 3, the driver bit B is removed. If you try to pull it up, driver bit B The arcuate surface 4a on the front side surface of the insertion convex part 4 in the screw rotation direction R abuts and locks the arcuate surface 5a on the upper inner surface of the insertion concave part 5 in an arc surface contact state. With the rotation in the rotation direction R, the blade portion 2 of the driver bit B tries to enter toward the bottom portion of the bit fitting groove 3, so that the so-called cam-out phenomenon can be further suppressed. .
[0014]
The second embodiment shown in FIGS. 6 to 9 shows another example structure. In this second embodiment, S is a screw, and in this case, the screw head 1 has a minus one blade portion 2 of a driver bit B. Is provided with one bit fitting groove 3 in the shape of a minus groove that can be fitted and detached, and two fitting projections 4 formed on both sides of the tip of the blade portion 2 at the bottom of each bit fitting groove 3. Two insertion recesses 5 that are recessed toward the front of the screw rotation direction R that can be inserted are formed.
[0015]
In this case, the upper inner surface of the insertion recess 5 is formed as a spiral surface 5a that gradually advances forward in the screw rotation direction toward the bottom of the bit fitting groove 3.
[0016]
B is a screwdriver bit, which is provided with one minus-shaped blade portion 2 that can be inserted into and removed from the minus-groove-shaped bit fitting groove 3 of the screw head 1, and a bit is provided on both sides of the tip portion of each blade portion 2. Two insertion convex portions 4 that can be inserted into two insertion concave portions 5 that are formed so as to be immersed in the bottom of the fitting groove 3 toward the front of the screw rotation direction R are formed.
[0017]
In this case, the front side surface of the fitting protrusion 4 in the screw rotation direction R is formed as a spiral surface 4a that gradually goes forward in the screw rotation direction toward the bottom of the bit fitting groove 3.
[0018]
Since the second embodiment of the present embodiment has the above-described configuration, the same effects as those of the first embodiment can be obtained.
[0019]
The present invention is not limited to the above embodiment, and in the above embodiment, the shape and structure of the driver bit and screw are appropriately changed and designed.
[0020]
As another embodiment, another insertion recess is formed on the opposite side of the bottom of the bit fitting groove 3 of the first and second embodiments from the insertion recess 5, and the tip of the blade portion 2 is formed. An insertion convex portion that can be inserted into the other insertion concave portion is formed on the side opposite to the insertion convex portion 4 so that the cam-out phenomenon is suppressed even when the screw is loosened and rotated. Also good. Further, the embodiments described above can also be applied to hexagonal wrench, square hole screw, hexagonal wrench, square wrench, etc. other than plus, minus screw and driver bit. The bottom surface of the bit fitting groove 3 of the screw S and the tip end surface of the driver bit B of the first embodiment are flat, but the bottom surface of the bit fitting groove 3 of the general screw S and the driver bit. It may be formed on a sharp bottom surface and a sharp end like the tip of B, and may have a structure that can be screwed and loosened by a general driver bit B.
[0021]
【The invention's effect】
As described above, according to the first or second aspect of the present invention, when the screw is tightened, the blade portion of the driver bit is fitted into the bit fitting groove, and the driver bit is turned in the screw turning direction. Then, the insertion convex portion formed at the tip of the blade portion is inserted into the insertion concave portion formed by immersing in the bottom of the bit fitting groove toward the front of the screw rotation direction, and is formed in the bit fitting groove. When the insertion convex portion formed on the blade portion of the driver bit is inserted into the insertion concave portion, when the driver bit is lifted outward, the front side surface of the screw rotation direction of the insertion convex portion of the driver bit is the insertion concave portion. Abuts and locks to the upper inner surface, and this locking prevents the driver bit from protruding outward from the screw bit fitting groove, so-called cam-out phenomenon. Continuously pressed strongly to it is unnecessary to, result in the driver bit need only position held against the screw, it only makes it possible to improve the workability it is possible to reduce the labor of the operator, and The front surface of the insertion convex portion in the screw rotation direction is formed as a spiral surface that gradually advances forward in the screw rotation direction toward the bottom of the bit fitting groove, and the upper inner surface of each insertion recess is formed in the bit fitting groove. Since it is formed in a spiral surface that goes forward in the screw turning direction as it goes to the bottom of the screw, when the blade part of the driver bit is fitted into the bit fitting groove and the driver bit is turned in the screw turning direction, the bit A fitting convex part formed at the tip of the blade part is fitted into a fitting concave part formed by immersing in the bottom of the fitting groove toward the front of the screw rotation direction, and the fitting concave part formed in the bit fitting groove. To screwdriver In the state where the insertion convex portion formed on the blade portion of the nut is inserted, when trying to pull the driver bit outward, the arcuate surface on the front side surface of the screw bit of the insertion convex portion of the driver bit is above the insertion concave portion. The arcuate surface of the inner surface abuts and locks with the arcuate surface contact state, and this arcuate surface contact causes the blade portion of the driver bit to face the bottom of the bit fitting groove as the driver bit rotates in the screw rotation direction. Therefore, the so-called come-out phenomenon can be further suppressed.
[0022]
As described above, the intended purpose can be sufficiently achieved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a first embodiment of the present invention.
FIG. 2 is a plan view of a screw according to a first embodiment of the present invention.
FIG. 3 is a partially enlarged sectional view of a first embodiment of the present invention.
FIG. 4 is an exploded perspective view of a second embodiment of the present invention.
FIG. 5 is a plan view of a screw according to a second embodiment of the present invention.
FIG. 6 is a partially enlarged cross-sectional view of a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Screw head 2 Blade part 3 Bit fitting groove 4 Insertion convex part 4a Spiral surface 5 Insertion recessed part 5a Spiral surface S Screw B Driver bit R Rotation direction

Claims (2)

ねじ頭部にドライバービットの刃部が嵌脱可能なビット嵌合溝を備えてなり、上記ビット嵌合溝の底部に上記刃部の先端部に形成された嵌入凸部が嵌入可能なねじ回動方向前方に向いて没入した嵌入凹部を形成し、該嵌入凹部の上側内面を上記ビット嵌合溝の底に向かうに従って次第にねじ回動方向前方に行く螺旋面に形成してなることを特徴とするねじ。The screw head is provided with a bit fitting groove into which the blade portion of the driver bit can be fitted and removed, and a screw screw which can be fitted with a fitting convex portion formed at the tip of the blade portion at the bottom of the bit fitting groove. An insertion recess recessed toward the front in the moving direction is formed , and the upper inner surface of the insertion recess is formed into a spiral surface that gradually goes forward in the screw rotation direction toward the bottom of the bit fitting groove. Screw to be used. ねじ頭部のビット嵌合溝に嵌脱可能な刃部を備えてなり、上記刃部の先端部に上記ビット嵌合溝の底部にねじ回動方向前方に向いて没入して形成された嵌入凹部に嵌入可能な嵌入凸部を形成し、該嵌入凸部のねじ回動方向前側面を上記ビット嵌合溝の底に向かうに従って次第にねじ回動方向前方に行く螺旋面に形成してなることを特徴とするドライバービット。It is provided with a detachable blade part in the bit fitting groove of the screw head, and is formed by immersing the tip part of the blade part into the bottom part of the bit fitting groove toward the front in the screw rotation direction. An insertion convex portion that can be inserted into the concave portion is formed, and the front side surface of the insertion convex portion in the screw rotation direction is formed as a spiral surface that gradually goes forward in the screw rotation direction toward the bottom of the bit fitting groove. Driver bit featuring
JP2001324589A 2001-10-23 2001-10-23 Screw and screwdriver bit Expired - Lifetime JP3852089B2 (en)

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JP2001324589A JP3852089B2 (en) 2001-10-23 2001-10-23 Screw and screwdriver bit

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US20090003967A1 (en) * 2007-06-29 2009-01-01 Acument Intellectual Properties, Llc Lobular drive system with interference fit and method and apparatus for fabricating same
CN114098892B (en) * 2021-12-09 2024-05-03 北京大学第三医院（北京大学第三临床医学院） Integrated screw rod for drilling and nailing, electric drill and method

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