JP4220610B2

JP4220610B2 - Screw and screwdriver bit

Info

Publication number: JP4220610B2
Application number: JP03513099A
Authority: JP
Inventors: 輝文野地川
Original assignee: 輝文野地川
Priority date: 1999-02-15
Filing date: 1999-02-15
Publication date: 2009-02-04
Anticipated expiration: 2019-02-15
Also published as: JP2000230526A

Description

【０００１】
【発明の属する技術分野】
本発明は、ネジおよびドライバビットに係り、特にドライバビットを嵌合される陥没穴状をなす回動部を改良されたネジおよびそのためのドライバビットに関する。
【０００２】
【従来の技術】
従来、陥没穴状をなすネジの回動部としては、図１に示される十字穴１が最も一般的に使用されている。このような十字穴１においては、４つの翼係合部（ドライバビットの翼部（羽根部）が係合される部分）２が、ネジ３の径方向に延びている。このような十字穴１を有するネジ３を締め付けたり緩めたりするドライバビット（図示せず）は、十字穴１に対応する形状を有しており、４つの翼部はそれぞれ軸方向から見ると、径方向に延びている。
【０００３】
【発明が解決しようとする課題】
前記十字穴１の場合、翼係合部２の両側の側壁面２１，２２がそれぞれ１つの平面状とされているため、十字穴１に対してドライバビットが正しくネジ３と同一軸上に挿入されたとしても、翼係合部２とドライバビットの翼部との引っ掛かりが悪いので、ネジ３を回転させようとするとき、所謂カムアウト現象（ドライバビットが回動部１，２から飛び出してしまう現象）を生じ易い。しかもその上、ネジ３に対してドライバビットが傾き易く、そのようにネジ３に対してドライバビットが傾いた状態では、より一層カムアウト現象を生じ易いという問題があった。
【０００４】
本発明は、このような従来の事情に鑑みてなされたもので、本発明の１つの目的は、ドライバビットがカムアウトしにくい（回動部から外れにくい）ネジおよびドライバビットを提供することにある。
【０００５】
本発明の他の目的は、以下の説明から明らかになろう。
【０００６】
【課題を解決するための手段】
本発明によるネジは、全体に陥没穴状をなし、ドライバビットの翼部を嵌合される翼係合部を備えた回動部を有するネジにおいて、
各翼係合部は、当該ネジ締め付け時に前記ドライバビットの前記翼部の回転方向前方に存在することとなる側壁面である締付側側壁面と、この締付側側壁面と反対側に位置し、当該ネジ緩め時に前記ドライバビットの前記翼部の回転方向前方に存在することとなる側壁面である緩め側側壁面とを有し、
前記締付側側壁面は、当該ネジの中心側から外方に向かって延びる平面状の基端側部分と、この基端側部分から、前記緩め側側壁面から遠ざかる方向に斜めに屈曲された平面状の先端側部分とを有してなるものである。
【０００７】
また、本発明によるドライバビットは、前記本発明によるネジの回動部に対応する形状を有するもので、全体に陥没穴状をなすネジの回動部の翼係合部に嵌合される翼部を有するドライバビットにおいて、
各翼部は、ネジ締め付け時に回転方向前方となる側の側面である締付側側面と、ネジ緩め時に回転方向前方となる側の側面である緩め側側面とを有し、
前記締付側側面は、当該ドライバビットの中心側から外方に向かって延びる平面状の基端側部分と、この基端側部分から、前記緩め側側面から遠ざかる方向に斜めに屈曲された平面状の先端側部分とを有してなるものである。
【０００８】
本発明においては、ネジの回動部の各翼係合部の締付側側壁面が、当該ネジの中心側から外方に向かって延びる平面状の基端側部分と、この基端側部分から、緩め側側壁面から遠ざかる方向に斜めに屈曲された平面状の先端側部分とを有しているので、対応する形状の翼部を有するビットを用いれば、ネジに対してドライバビットが傾きにくくなり、また、翼部の屈曲した側面に、対応する形状に屈曲した翼係合部の側壁面が食い込むので、前記側面が前記側壁面を確実に把握し、翼部と翼係合部との引っ掛かりがよくなるため、ドライバビットがカムアウトしにくくなる。
【０００９】
【発明の実施の形態】
以下、本発明を実施例に基づいて説明する。
【００１０】
【実施例】
図２〜５は本発明の第一実施例を示し、このうち図２はネジ３の平面図（ネジ３をその頭部４側から軸方向に見た図）、図３は図２のＩＩＩ−ＩＩＩ線における断面図、図４はネジ３の回動部５にドライバビット６が嵌合された状態を示す横断面図、図５は図４の要部の拡大断面図である。ネジ３の軸部７には右ネジのネジ山２３が形成されている。ネジ３の頭部４には該頭部４の一部を陥没させてなる陥没穴状の回動部５が設けられている。図２に示されるように、この回動部５は全体に大略十字状をなしており、９０度間隔に配置された４つの翼係合部２を備えている。各翼係合部２の両側の側壁面９，１０のうちの、ネジ３緩め時にドライバビット６の翼部８の回転方向前方に存在することとなる側の側壁面９（以下、緩め側側壁面と呼ぶ）は、ほぼ全体に１つの平面状をなしている。他方、各翼係合部２の、ネジ３締め付け時にドライバビット６の翼部８の回転方向前方に存在することとなる側の側壁面１０（以下、締付側側壁面と呼ぶ）は屈曲されている。すなわち、この締付側側壁面１０の先端側部分１０ａは該締付側側壁面１０の基端側部分１０ｂに対し緩め側側壁面９から遠ざかる方向に屈曲されている。
【００１１】
なお、本実施例では、各翼係合部２の緩め側側壁面９並びに締付側側壁面１０の基端側部分１０ｂおよび先端側部分１０ａは、ネジ３の軸方向と平行な平面状とされているが、これらの側壁面９，１０は、ドライバビット６の挿入を容易にするために、適当な勾配の傾斜面としてもよい。
【００１２】
図２および３に示されるように、前記回動部５の中心付近部および翼係合部２の基端側部分の底面１１は、比較的に緩い勾配でネジ３の中心側から外周側へ登って行く傾斜面とされる一方、翼係合部２の先端側部分の底面１２は急峻な勾配で外周側へと登って行く傾斜面とされている。
【００１３】
図４および５において、ドライバビット６はネジ３の軸に対し垂直に断面した横断面として表れている。この図４から明らかなように、ドライバビット６は回動部５に対応する横断面形状を有しており、各翼部８の両側面１３，１４のうちの、ネジ３緩め時に回転方向前方となる側の側面１３（以下、緩め側側面と呼ぶ）は、ほぼ全体に１つの平面状をなしている。他方、各翼部８の、ネジ３締め付け時に回転方向前方となる側の側面１４（以下、締付側側面と呼ぶ）は屈曲されている。すなわち、この締付側側面１４の先端側部分１４ａは、該締付側側面１４の基端側部分１４ｂに対し、緩め側側面１３から遠ざかる方向に屈曲されている。
【００１４】
次に、本実施例の作動を説明する。このネジ３およびドライバビット６においては、ネジ３の翼係合部２およびドライバビット６の翼部８が屈曲されているので、回動部５にドライバビット６を挿入するとき、ネジ３の軸に対してドライバビット６が傾きにくい。そして、ネジ３締め付け時は、ドライバビット６の翼部８の屈曲した締付側側面１４に、対応する形状に屈曲した回動部５の翼係合部２の締付側側壁面１０が食い込むので、側面１４が側壁面１０を確実に把握し、翼部８と翼係合部２との引っ掛かりがよくなるため、ネジ３締め付け時にドライバビット６がカムアウトしにくくなる。
【００１５】
なお、本実施例においては、各翼係合部２の締付側側壁面１０の基端側部分１０ｂおよび先端側部分１０ａとドライバビット６の翼部８の締付側側面１４の基端側部分１４ｂおよび先端側部分１４ａとが、それぞれネジ３の軸方向と平行な平面状とされているので、これによっても一層カムアウトが生じにくくなるが、本発明においては、これらの側壁面１０ａ，１０ｂおよび側面１４ａ，１４ｂを適当な勾配の傾斜面としても、これらが屈曲していることにより、前記のように翼部８と翼係合部２との引っ掛かりがよくなるため、カムアウトが生じにくくなる。
【００１６】
図６および７は本発明の第二実施例を示している。前記実施例においては、ネジ３の回動部５の翼係合部２の締付側側壁面１０およびドライバビット６の翼部８の締付側側面１４のみが屈曲されていたが、本実施例では、翼係合部２の緩め側側壁面９および翼部８の緩め側側面１３も同様に屈曲されている。すなわち、ネジ３の緩め側側壁面９の先端側部分９ａは該緩め側側壁面９の基端側部分９ｂに対し締付側側壁面１０から遠ざかる方向に屈曲され、ドライバビット６の緩め側側面１３の先端側部分１３ａも、該緩め側側面１３の基端側部分１３ｂに対し、締付側側面１４から遠ざかる方向に屈曲されている。ネジ３およびドライバビット６の他の構成は前記実施例と同様である。
【００１７】
本実施例においては、ネジ３緩め時には、ドライバビット６の翼部８の屈曲した緩め側側面１３に、対応する形状に屈曲した回動部５の翼係合部２の緩め側側壁面９が食い込むので、側面１３が側壁面９を確実に把握し、翼部８と翼係合部２との引っ掛かりがよくなるため、ネジ３緩め時にもドライバビット６がカムアウトしにくくなる。
【００１８】
図８および９は、本発明の第三実施例を示している。図では回動部５の形状およびドライバビット６のみ示しているが、本実施例においては、図示しないネジの軸部には右ネジのネジ山が形成されている。回動部５は図示しないネジの頭部の一部を陥没させてなり、この回動部５は、軸方向頭部側から見てネジの軸線にその中心を一致された正方形状をなす正方形状部１５と、４つの直線状の翼係合部２とからなる。各翼係合部２の緩め側側壁面９の基端側部分９ｂの上端は、正方形状部１５の上端の各辺をそれぞれ一方に延長した延長線上を延びている。各翼係合部２の緩め側側壁面９の先端側部分９ａは基端側部分９ｂに対し締付側側壁面１０から遠ざかる方向に屈曲されている。また、各翼係合部２の締付側側壁面１０の基端側部分１０ｂは緩め側側壁面９の基端側部分９ｂと平行とされ、締付側側壁面１０の先端側部分１０ａは基端側部分１０ｂに対し緩め側側壁面９から遠ざかる方向に屈曲されている。
【００１９】
なお、本実施例では、各翼係合部２の緩め側側壁面９の基端側部分９ｂおよび先端側部分９ａ並びに締付側側壁面１０の基端側部分１０ｂおよび先端側部分１０ａは、ネジ３の軸方向と平行な平面状とされているが、これらの側壁面は、ドライバビット６の挿入を容易にするために、適当な勾配の傾斜面としてもよい。
【００２０】
前記回動部５の正方形状部１５および翼係合部２の基端側の部分の底面１１は、比較的に緩い勾配でネジの中心側から外周側へ登って行く傾斜面とされる一方、翼係合部２の先端側部分の底面１２は急峻な勾配で外周側へと登って行く傾斜面とされている。
【００２１】
図９に示されるように、ドライバビット６は回動部５に対応する横断面形状を有しており、各翼部８の緩め側側面１３の先端側部分１３ａは該緩め側側面１３の基端側部分１３ｂに対し締付側側面１４から遠ざかる方向に屈曲され、締付側側面１４の先端側部分１４ａは該締付側側面１４の基端側部分１４ｂに対し緩め側側面１３から遠ざかる方向に屈曲されている。
【００２２】
本実施例においても、ネジ締め付け時には、ドライバビット６の翼部８の屈曲した締付側側面１４に、対応する形状に屈曲した回動部５の翼係合部２の締付側側壁面１０が食い込むので、側面１４が側壁面１０を確実に把握し、翼部８と翼係合部２との引っ掛かりがよくなる一方、ネジ緩め時には、ドライバビット６の翼部８の屈曲した緩め側側面１３に、対応する形状に屈曲した回動部５の翼係合部２の緩め側側壁面９が食い込むので、側面１３が側壁面９を確実に把握し、翼部８と翼係合部２との引っ掛かりがよくなるので、ネジ締め付け時にも、緩め時にも、ドライバビット６がカムアウトしにくくなる。
【００２３】
図１０および１１は、本発明の第四実施例を示している。図では回動部５の形状およびドライバビット６のみ示しているが、本実施例においては、図示しないネジの軸部には右ネジのネジ山が形成されている。回動部５は図示しないネジの頭部の一部を陥没させてなり、この回動部５は、軸方向頭部側から見てネジの軸線にその中心を一致された正方形状をなす正方形状部１５と、２つの翼係合部２とからなる。各翼係合部２の緩め側側壁面９の上端は、正方形状部１５の上端の４辺のうちの平行する２辺のみをそれぞれ一方に延長した延長線上を延びている。各翼係合部２の緩め側側壁面９の先端側部分９ａは該緩め側側壁面９の基端側部分９ｂに対し締付側側壁面１０から遠ざかる方向に屈曲されている。また、各翼係合部２の締付側側壁面１０の先端側部分１０ａは該締付側側壁面１０の基端側部分１０ｂに対し緩め側側壁面９から遠ざかる方向に屈曲されている。図１１に示されるように、ドライバビット６は回動部５に対応する横断面形状を有している。他の構成は、前記図８および９の第三実施例と同様である。
【００２４】
本実施例においても、前記各実施例の場合と同様にして、ネジ締め付け時にも、緩め時にも、ドライバビット６がカムアウトしにくくなるという効果が得られる。
【００２５】
図１２および１３は、本発明の第五実施例を示している。図では回動部の形状およびドライバビットのみ示しているが、本実施例においては、図示しないネジの軸部には右ネジのネジ山が形成されている。回動部５は図示しないネジの頭部の一部を陥没させてなり、この回動部５は、軸方向頭部側から見てネジの軸線にその中心を一致された正三角形状をなす三角形状部１８と、３つの翼係合部２とからなる。各翼係合部２の緩め側側壁面９の基端側部分９ｂの上端は、三角形状部１８の各辺をそれぞれ一方に延長した延長線上を延びている。各翼係合部２の緩め側側壁面９の先端側部分９ａは基端側部分９ｂに対し締付側側壁面１０から遠ざかる方向に屈曲されている。また、各翼係合部２の締付側側壁面１０の先端側部分１０ａは該締付側壁面１０の基端側部分１０ｂに対し緩め側側壁面９から遠ざかる方向に屈曲されている。図１３に示されるように、ドライバビット６は回動部５に対応する横断面形状を有している。他の構成は、前記図８〜１１の第三実施例および第四実施例と同様である。
【００２６】
本実施例においても、前記各実施例の場合と同様にして、ネジ締め付け時にも、緩め時にも、ドライバビット６がカムアウトしにくくなるという効果が得られる。
【００２７】
なお、前記各実施例においては、翼係合部の数が２〜４個とされているが、本発明においては、翼係合部の数を５以上としてもよい。
【００２８】
【発明の効果】
以上のように本発明は、ネジの回動部からドライバビットがカムアウトしにくくなる等の優れた効果を得られるものである。
【図面の簡単な説明】
【図１】従来の十字穴付きネジを示す平面図である。
【図２】本発明の第一実施例におけるネジを示す平面図である。
【図３】図２のＩＩＩ−ＩＩＩ線における断面図である。
【図４】前記第一実施例のネジの回動部にドライバビットが嵌合された状態を示す横断面図である。
【図５】図４の要部の拡大断面図である。
【図６】本発明の第二実施例におけるネジを示す平面図である。
【図７】前記第二実施例のネジの回動部にドライバビットが嵌合された状態を示す横断面図である。
【図８】本発明の第三実施例におけるネジの回動部を示す平面図である。
【図９】前記第三実施例のネジの回動部にドライバビットが嵌合された状態を示す横断面図である。
【図１０】本発明の第四実施例におけるネジの回動部を示す平面図である。
【図１１】前記第四実施例のネジの回動部にドライバビットが嵌合された状態を示す横断面図である。
【図１２】本発明の第五実施例におけるネジの回動部を示す平面図である。
【図１３】前記第五実施例のネジの回動部にドライバビットが嵌合された状態を示す横断面図である。
【符号の説明】
２翼係合部
３ネジ
５回動部
６ドライバビット
８翼部
９翼係合部２の緩め側側壁面
９ａ緩め側側壁面９の先端側部分
９ｂ緩め側側壁面９の基端側部分
１０翼係合部２の締付側側壁面
１０ａ締付側側壁面１０の先端側部分
１０ｂ締付側側壁面１０の基端側部分
１３翼部８の緩め側側面
１３ａ緩め側側面１３の先端側部分
１３ｂ緩め側側面１３の基端側部分
１４翼部８の締付側側面
１４ａ締付側側面１４の先端側部分
１４ｂ締付側側面１４の基端側部分[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw and a driver bit, and more particularly, to a screw with an improved rotating portion having a recessed hole shape into which a driver bit is fitted and a driver bit therefor.
[0002]
[Prior art]
Conventionally, the cross hole 1 shown in FIG. 1 is most commonly used as a rotating part of a screw having a recessed hole shape. In such a cross hole 1, four blade engaging portions (portions where the blade portions (blade portions) of the driver bit are engaged) 2 extend in the radial direction of the screw 3. A driver bit (not shown) for tightening or loosening the screw 3 having the cross hole 1 has a shape corresponding to the cross hole 1, and the four wing parts are respectively viewed from the axial direction. It extends in the radial direction.
[0003]
[Problems to be solved by the invention]
In the case of the cross hole 1, the side wall surfaces 21 and 22 on both sides of the blade engaging portion 2 are each formed in a single plane, so that the driver bit is correctly inserted on the same axis as the screw 3 with respect to the cross hole 1. Even if it is done, the hook between the blade engaging portion 2 and the blade portion of the driver bit is bad, so when the screw 3 is rotated, a so-called cam-out phenomenon (the driver bit jumps out of the rotating portions 1 and 2). Phenomenon). In addition, the driver bit easily tilts with respect to the screw 3, and when the driver bit tilts with respect to the screw 3, there is a problem that the cam-out phenomenon is more likely to occur.
[0004]
The present invention has been made in view of such a conventional situation, and one object of the present invention is to provide a screw and a driver bit in which the driver bit is unlikely to come out (not easily detached from the rotating portion). .
[0005]
Other objects of the present invention will become apparent from the following description.
[0006]
[Means for Solving the Problems]
The screw according to the present invention has a recessed hole shape as a whole, and is a screw having a rotating portion having a blade engaging portion into which a blade portion of a driver bit is fitted,
Each blade engagement portion is positioned on the side opposite to the tightening side wall surface, which is a side wall surface that is present in the rotational direction of the blade portion of the driver bit when the screw is tightened. And a loose side wall surface that is a side wall surface that will be present in the rotational direction front of the wing portion of the driver bit when the screw is loosened,
The tightening side wall surface is bent obliquely in a direction away from the loose side wall surface from a flat base end side portion extending outward from the center side of the screw and the base end portion. And a flat tip side portion.
[0007]
The driver bit according to the present invention has a shape corresponding to the rotating portion of the screw according to the present invention, and is a blade that is fitted into the blade engaging portion of the rotating portion of the screw that forms a recessed hole as a whole. In the driver bit having a part,
Each wing has a tightening side surface that is a side surface that is the front side in the rotational direction when the screw is tightened, and a loose side surface surface that is a side surface that is the front side in the rotational direction when the screw is loosened,
The tightening side surface includes a planar base end portion extending outward from the center side of the driver bit, and a plane bent obliquely from the base end portion in a direction away from the loose side surface. And a distal end portion of the shape .
[0008]
In the present invention, the tightening side wall surface of each blade engaging portion of the rotating portion of the screw has a planar base end portion extending outward from the center side of the screw, and the base end portion. Therefore, if a bit having a corresponding wing portion is used, the driver bit is inclined with respect to the screw because it has a flat tip side portion bent obliquely in a direction away from the loose side wall surface. In addition, since the side wall surface of the wing engaging portion bent into the corresponding shape bites into the bent side surface of the wing portion, the side surface reliably grasps the side wall surface, and the wing portion, the wing engaging portion, The driver bit is less likely to come out.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on examples.
[0010]
【Example】
2 to 5 show a first embodiment of the present invention, in which FIG. 2 is a plan view of the screw 3 (a view of the screw 3 viewed in the axial direction from the head 4 side), and FIG. FIG. 4 is a cross-sectional view taken along line -III, FIG. 4 is a transverse cross-sectional view showing a state where the driver bit 6 is fitted to the rotating portion 5 of the screw 3, and FIG. 5 is an enlarged cross-sectional view of the main part of FIG. A right-hand thread 23 is formed on the shaft 7 of the screw 3. The head 4 of the screw 3 is provided with a recessed hole-shaped rotating portion 5 formed by recessing a part of the head 4. As shown in FIG. 2, the rotating portion 5 has a substantially cross shape as a whole, and includes four blade engaging portions 2 arranged at intervals of 90 degrees. Of the side wall surfaces 9, 10 on both sides of each blade engaging portion 2, the side wall surface 9 (hereinafter referred to as the loose side) that will be present forward in the rotational direction of the blade portion 8 of the driver bit 6 when the screw 3 is loosened. (Referred to as a wall surface) has a single planar shape almost entirely. On the other hand, the side wall surface 10 (hereinafter referred to as a tightening side wall surface) of each blade engaging portion 2 that is present forward in the rotational direction of the blade portion 8 of the driver bit 6 when the screw 3 is tightened is bent. ing. That is, the distal end portion 10 a of the tightening side wall surface 10 is bent in a direction away from the loose side wall surface 9 with respect to the proximal end portion 10 b of the tightening side wall surface 10.
[0011]
In the present embodiment, the loose side wall surface 9 of each blade engaging portion 2 and the proximal end side portion 10b and the distal end side portion 10a of the tightening side wall surface 10 have a planar shape parallel to the axial direction of the screw 3. However, these side wall surfaces 9 and 10 may be inclined surfaces having an appropriate slope in order to facilitate the insertion of the driver bit 6.
[0012]
2 and 3, the bottom surface 11 near the center of the rotating portion 5 and the base end side portion of the blade engaging portion 2 has a relatively gentle gradient from the center side of the screw 3 to the outer peripheral side. On the other hand, the bottom surface 12 of the tip side portion of the blade engaging portion 2 is an inclined surface that climbs to the outer peripheral side with a steep slope.
[0013]
4 and 5, the driver bit 6 appears as a cross-section that is perpendicular to the axis of the screw 3. As is apparent from FIG. 4, the driver bit 6 has a cross-sectional shape corresponding to the rotating portion 5, and the front side in the rotational direction when the screw 3 is loosened on both side surfaces 13 and 14 of each wing portion 8. The side surface 13 (hereinafter referred to as the loose side surface) on the side is substantially flat. On the other hand, of each wing 8, the side surface 14 on the side as a rotation direction front side when the screw 3 fastening (hereinafter, referred to as a fastening side surface) is bent. That is, the distal end portion 14 a of the tightening side surface 14 is bent in a direction away from the loose side surface 13 with respect to the proximal end portion 14 b of the tightening side surface 14.
[0014]
Next, the operation of this embodiment will be described. In the screw 3 and the driver bit 6, since the blade engaging portion 2 of the screw 3 and the blade portion 8 of the driver bit 6 are bent, the shaft of the screw 3 is inserted when the driver bit 6 is inserted into the rotating portion 5. However, the driver bit 6 is not easily inclined. When the screw 3 is tightened, the tightening side wall surface 10 of the blade engaging portion 2 of the rotating portion 5 bent into a corresponding shape bites into the bent tightening side surface 14 of the wing portion 8 of the driver bit 6. Therefore, the side surface 14 reliably grasps the side wall surface 10 and the wing portion 8 and the wing engaging portion 2 are easily caught. Therefore, the driver bit 6 is difficult to come out when the screw 3 is tightened.
[0015]
In the present embodiment, the base end side 10b and the tip end side portion 10a of the tightening side wall surface 10 of each blade engaging portion 2 and the base end side of the tightening side surface 14 of the blade portion 8 of the driver bit 6 are used. Since the portion 14b and the tip end portion 14a are each formed in a plane shape parallel to the axial direction of the screw 3, this also makes it difficult for camout to occur. However, in the present invention, these side wall surfaces 10a, 10b Even if the side surfaces 14a and 14b are inclined surfaces having an appropriate gradient, since these are bent, the wing portion 8 and the wing engaging portion 2 are easily caught as described above, so that the cam-out hardly occurs.
[0016]
6 and 7 show a second embodiment of the present invention. In the above embodiment, only the tightening side wall surface 10 of the blade engaging portion 2 of the rotating portion 5 of the screw 3 and the tightening side surface 14 of the wing portion 8 of the driver bit 6 are bent. In the example, the loose side wall surface 9 of the blade engaging portion 2 and the loose side surface 13 of the blade portion 8 are similarly bent. That is, the distal end side portion 9 a of the loose side wall surface 9 of the screw 3 is bent in a direction away from the tightening side wall surface 10 with respect to the proximal side portion 9 b of the loose side wall surface 9, and the loose side surface of the driver bit 6 is The distal end portion 13 a of 13 is also bent in a direction away from the tightening side surface 14 with respect to the proximal end portion 13 b of the loose side surface 13. Other configurations of the screw 3 and the driver bit 6 are the same as those in the above embodiment.
[0017]
In the present embodiment, when the screw 3 is loosened, the loose side wall surface 9 of the blade engaging portion 2 of the rotating portion 5 bent into a corresponding shape is formed on the loose side surface 13 of the wing portion 8 of the driver bit 6 bent. Since it bites in, the side surface 13 reliably grasps the side wall surface 9 and the wing portion 8 and the wing engaging portion 2 are easily caught. Therefore, the driver bit 6 is difficult to come out even when the screw 3 is loosened.
[0018]
8 and 9 show a third embodiment of the present invention. Although only the shape of the rotating portion 5 and the driver bit 6 are shown in the figure, in this embodiment, a right-hand thread is formed on a shaft portion of a screw (not shown). The rotating unit 5 is formed by recessing a part of a screw head (not shown), and the rotating unit 5 is a square having a center shape aligned with the axis of the screw when viewed from the axial head side. And the four straight blade engaging portions 2. The upper end of the base end side portion 9b of the loose side wall surface 9 of each blade engaging portion 2 extends on an extension line obtained by extending each side of the upper end of the square-shaped portion 15 to one side. The distal end side portion 9a of the loose side wall surface 9 of each blade engaging portion 2 is bent in a direction away from the tightening side wall surface 10 with respect to the proximal side portion 9b. Further, the base end side portion 10b of the tightening side wall surface 10 of each blade engaging portion 2 is parallel to the base end side portion 9b of the loose side wall surface 9, and the front end side portion 10a of the tightening side wall surface 10 is The base end portion 10b is bent in a direction away from the loose side wall surface 9.
[0019]
In this embodiment, the base end side portion 9b and the tip end side portion 9a of the loose side wall surface 9 of each blade engaging portion 2 and the base end side portion 10b and the tip end side portion 10a of the tightening side wall surface 10 are: Although the shape is a plane parallel to the axial direction of the screw 3, these side wall surfaces may be inclined surfaces having an appropriate gradient in order to facilitate the insertion of the driver bit 6.
[0020]
The square portion 15 of the rotating portion 5 and the bottom surface 11 of the base end side portion of the blade engaging portion 2 are inclined surfaces that rise from the center side of the screw to the outer peripheral side with a relatively gentle gradient. The bottom surface 12 of the tip side portion of the blade engaging portion 2 is an inclined surface that climbs to the outer peripheral side with a steep gradient.
[0021]
As shown in FIG. 9, the driver bit 6 has a cross-sectional shape corresponding to the rotating portion 5, and the distal end side portion 13 a of the loose side surface 13 of each wing portion 8 is the base of the loose side surface 13. Bending in a direction away from the fastening side surface 14 with respect to the end side portion 13b, and a distal end side portion 14a of the fastening side surface 14 in a direction away from the loose side surface 13 with respect to the proximal side portion 14b of the fastening side surface 14 Is bent.
[0022]
Also in this embodiment, at the time of screw tightening, the tightening side wall surface 10 of the blade engaging portion 2 of the rotating portion 5 bent into a corresponding shape is formed on the tightening side surface 14 of the wing portion 8 of the driver bit 6 bent. Therefore, the side surface 14 securely grasps the side wall surface 10 and the wing portion 8 and the wing engaging portion 2 are easily caught. On the other hand, when the screw is loosened, the loosened side surface 13 of the wing portion 8 of the driver bit 6 is bent. In addition, since the loose side wall surface 9 of the blade engaging portion 2 of the rotating portion 5 bent into the corresponding shape bites in, the side surface 13 securely grasps the side wall surface 9, and the wing portion 8 and the blade engaging portion 2 Therefore, it is difficult for the driver bit 6 to come out when the screw is tightened or loosened.
[0023]
10 and 11 show a fourth embodiment of the present invention. Although only the shape of the rotating portion 5 and the driver bit 6 are shown in the figure, in this embodiment, a right-hand thread is formed on a shaft portion of a screw (not shown). The rotating unit 5 is formed by recessing a part of a screw head (not shown), and the rotating unit 5 is a square having a center shape aligned with the axis of the screw when viewed from the axial head side. And the two blade engaging portions 2. The upper end of the loose side wall surface 9 of each blade engaging portion 2 extends on an extension line in which only two parallel sides of the four upper ends of the square-shaped portion 15 are extended to one side. The distal end side portion 9 a of the loose side wall surface 9 of each blade engaging portion 2 is bent in a direction away from the tightening side wall surface 10 with respect to the proximal end portion 9 b of the loose side wall surface 9. Further, the distal end side portion 10 a of the tightening side wall surface 10 of each blade engaging portion 2 is bent in a direction away from the loose side wall surface 9 with respect to the proximal side portion 10 b of the tightening side wall surface 10. As shown in FIG. 11, the driver bit 6 has a cross-sectional shape corresponding to the rotating portion 5. Other configurations are the same as those of the third embodiment shown in FIGS.
[0024]
In the present embodiment as well, as in the case of each of the embodiments described above, the effect that the driver bit 6 is difficult to come out when tightening or loosening the screw is obtained.
[0025]
12 and 13 show a fifth embodiment of the present invention. Although only the shape of the rotating portion and the driver bit are shown in the figure, in the present embodiment, a screw thread of a right screw is formed on a shaft portion of a screw (not shown). The rotating unit 5 is formed by recessing a part of a screw head (not shown), and the rotating unit 5 has an equilateral triangle shape whose center coincides with the axis of the screw when viewed from the axial head side. It consists of a triangular portion 18 and three blade engaging portions 2. The upper end of the base end side portion 9b of the loose side wall surface 9 of each blade engaging portion 2 extends on an extension line obtained by extending each side of the triangular portion 18 to one side. The distal end side portion 9a of the loose side wall surface 9 of each blade engaging portion 2 is bent in a direction away from the tightening side wall surface 10 with respect to the proximal side portion 9b. Further, the distal end side portion 10 a of the fastening side wall surface 10 of each blade engaging portion 2 is bent in a direction away from the loose side wall surface 9 with respect to the proximal side portion 10 b of the fastening side wall surface 10. As shown in FIG. 13, the driver bit 6 has a cross-sectional shape corresponding to the rotating portion 5. Other configurations are the same as those of the third and fourth embodiments shown in FIGS.
[0026]
In the present embodiment as well, as in the case of each of the embodiments described above, the effect that the driver bit 6 is difficult to come out when tightening or loosening the screw is obtained.
[0027]
In each of the above embodiments, the number of blade engaging portions is 2 to 4, but in the present invention, the number of blade engaging portions may be 5 or more.
[0028]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain an excellent effect such that the driver bit is difficult to come out from the rotating portion of the screw.
[Brief description of the drawings]
FIG. 1 is a plan view showing a conventional screw with a cross hole.
FIG. 2 is a plan view showing a screw in the first embodiment of the present invention.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a cross-sectional view showing a state in which a driver bit is fitted to the rotating portion of the screw of the first embodiment.
5 is an enlarged cross-sectional view of a main part of FIG.
FIG. 6 is a plan view showing a screw in a second embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a state in which a driver bit is fitted to a rotating portion of a screw according to the second embodiment.
FIG. 8 is a plan view showing a screw rotation portion in a third embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a state in which a driver bit is fitted to a rotating portion of a screw according to the third embodiment.
FIG. 10 is a plan view showing a rotating portion of a screw in a fourth embodiment of the present invention.
FIG. 11 is a cross-sectional view showing a state in which a driver bit is fitted to a rotating portion of a screw according to the fourth embodiment.
FIG. 12 is a plan view showing a rotating part of a screw in a fifth embodiment of the present invention.
FIG. 13 is a cross-sectional view showing a state in which a driver bit is fitted to a rotating portion of a screw according to the fifth embodiment.
[Explanation of symbols]
2 Blade engaging portion 3 Screw 5 Rotating portion 6 Driver bit 8 Blade portion 9 Loose side wall surface 9a of the blade engaging portion 2 Tip side portion 9b of the loose side wall surface 9 Base end side portion 10 of the loose side wall surface 9 Tightening side wall surface 10a of the blade engaging portion 2 Tip side portion 10b of the tightening side wall surface 10 Base end side portion 13 of the tightening side wall surface 10 Loose side surface 13a of the wing portion 8 Tip side of the loose side surface 13 Part 13b Base end side portion 14 of the loose side surface 13 Fastening side surface 14a of the wing portion 8 Tip side portion 14b of the tightening side surface 14 Base end side portion of the tightening side surface 14

Claims

In a screw having a rotating part with a wing engaging part fitted with a wing part of a driver bit, which is formed into a recessed hole as a whole,
Each blade engagement portion is positioned on the side opposite to the tightening side wall surface, which is a side wall surface that is present in the rotational direction of the blade portion of the driver bit when the screw is tightened. And a loose side wall surface that is a side wall surface that will be present in the rotational direction front of the wing portion of the driver bit when the screw is loosened,
The tightening side wall surface is bent obliquely in a direction away from the loose side wall surface from a flat base end side portion extending outward from the center side of the screw and the base end portion. A screw having a flat tip side portion.

The loose side wall surface of each blade engaging portion has a planar base end portion extending outward from the center side of the screw and a direction away from the tightening side wall surface from the base end portion. The screw according to claim 1, further comprising a flat front end portion bent obliquely.

In the driver bit having a wing part fitted to the wing engaging part of the rotating part of the screw that forms a recessed hole as a whole,
Each wing has a tightening side surface that is a side surface that is the front side in the rotational direction when the screw is tightened, and a loose side surface surface that is a side surface that is the front side in the rotational direction when the screw is loosened,
The tightening side surface includes a planar base end portion extending outward from the center side of the driver bit, and a plane bent obliquely from the base end portion in a direction away from the loose side surface. A driver bit having a tip end side portion.

The loose side surface of each wing portion is inclined in a direction away from the tightening side surface from the flat base end portion extending outward from the center side of the driver bit and the base end portion. 4. The driver bit according to claim 3, further comprising a bent flat tip side portion.