JP2003231066A - Normal and reverse rotating bolt fastener - Google Patents

Normal and reverse rotating bolt fastener

Info

Publication number
JP2003231066A
JP2003231066A JP2002032411A JP2002032411A JP2003231066A JP 2003231066 A JP2003231066 A JP 2003231066A JP 2002032411 A JP2002032411 A JP 2002032411A JP 2002032411 A JP2002032411 A JP 2002032411A JP 2003231066 A JP2003231066 A JP 2003231066A
Authority
JP
Japan
Prior art keywords
shaft member
output shaft
way clutch
axial direction
drive shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002032411A
Other languages
Japanese (ja)
Inventor
Hajime Kikuchi
一 菊池
Kensho Kikuchi
憲昭 菊池
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP2002032411A priority Critical patent/JP2003231066A/en
Publication of JP2003231066A publication Critical patent/JP2003231066A/en
Pending legal-status Critical Current

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  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt fastener having a long service life by restricting the idle running of a one-way clutch when reversely rotating. <P>SOLUTION: A cylindrical member 17 impossible to rotate and possible to move in the axial direction in relation to a shaft part 7b of one shaft member 7 and impossible to move in the axial direction in relation to the one-way clutch 16 is provided between the shaft part 7b of the shaft member 7 possible to move in the axial direction inside of the one-way clutch 16 fitted to the other shaft member 4 and the inner periphery of the one-way clutch 16. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、天井および壁に使
用する石膏ボード等のねじ締め作業で用いられるねじ締
め機(電動ボード用ドライバ)に関するものである。 【0002】 【従来の技術】電動スクリュードライバ等のねじ締め機
は、主に石膏ボード等の被締付材料を対象に使用され
る。このねじ締め機は、ねじ締め作業の場合、ねじ締め
の深さ位置を一定の深さにする必要があるため、本体の
一部に軸方向移動調節可能なストッパを設け、ねじ締め
作業中にストッパが被締結部材に当接する位置まで本体
が移動すると、クラッチの遮断動作を行うねじ締め深さ
の調節機構が設けられている。一方、逆回転時のねじ緩
め作業の場合、ワンウェイクラッチにより動力が伝達さ
れる機構が設けられている。 【0003】従来のねじ締め機の一例である特開平8−
267367号公報に開示されているねじ締め機を図1
0及び図11を用いて以下説明する。 【0004】図10において、ねじ締め機のハウジング
2の先端にはストッパスリーブ3がねじ嵌合し取付けら
れている。ハウジング2に対してストッパスリーブ3を
回転させることにより、ストッパスリーブ3とハウジン
グ2との相対距離を調節することができ、これによりね
じ送り距離(ねじ締込み深さ)が調節可能となる。 【0005】ハウジング2内では電動機(図示省略)の
出力軸に取付けられたピニオン19が駆動軸部材4の外
周に設けられたギヤ5と噛み合っており、駆動軸部材4
とギヤ5とは回転方向に一体であるため、ギヤ5を介し
てモータの回転が駆動軸部材4に伝達される。 【0006】圧縮ばねであるクラッチスプリング6は図
11に示すように左巻きで、上方端部と下方端部が軸方
向に延びた形状をしている。 【0007】係合ボール18を有し、係合ボール18に
よってビット10を一体回転可能に収納する出力軸部材
7は、メタル部8によって回動及び軸方向移動可能に支
持されると共にビット10側への移動位置が規制されて
いる。また、出力軸部材7は駆動軸部材4の駆動軸側ス
リーブ4a内に保持されたワンウェイクラッチ16内に
位置する軸部7bを持ち、出力軸部材7の軸部7bはワ
ンウェイクラッチ16内を軸方向移動可能であると共
に、ワンウェイクラッチ16の作用によってワンウェイ
クラッチ16に対して一回転方向(ねじ締め方向)にの
み回動可能となっている。 【0008】ストッパスリーブ3の駆動軸部材4側端部
には、回転不能かつ軸方向移動可能に設けられ、圧縮ば
ね11によりストッパスリーブ3側に常時付勢されたロ
ック部材12が当接しており、通常時にはストッパスリ
ーブ3とロック部材12の当接部に両者に対して互いに
噛み合うよう設けられた凹凸状の爪部が係合している。
従って、ストッパスリーブ3の爪部とロック部材12の
爪部とが噛み合っている状態では、ストッパスリーブ3
はハウジング2に対して回転不能であり、軸方向位置が
固定されている。なお、ねじ締込み深さの調整は、操作
者がロック部材12を圧縮ばね11に抗して駆動軸部材
4側に摺動させ、ストッパスリーブ3とロック部材12
の爪部との係合を解除した状態でハウジング2に対して
ストッパスリーブ3を回転させることにより行うことが
できる。 【0009】出力軸部材7の反ビット10側端部には駆
動軸部材4内に軸方向移動可能に設けられた傘状部材1
3が当接されており、この傘状部材13の外周のテーパ
ー部13aには駆動軸側スリーブ4aに設けられた貫通
孔4b内に半径方向に移動可能に設けられたボール9が
当接しており、また傘状部材13はスプリング15によ
って常時出力軸部材7側に押圧されている。 【0010】図10に示す状態では、ビット10及び出
力軸部材7は傘状部材13を介してスプリング15の押
圧力により、図示下方に移動し、ビット10先端部はス
トッパスリーブ3先端よりも突出した状態にある。 【0011】この状態からねじ締め作業を開始すること
により、ビット10及び出力軸部材7は傘状部材13を
介してスプリング15の押圧力に抗しながら図示上方に
軸方向移動する。 【0012】このようにビット10及び出力軸部材7が
軸方向に移動すると、出力軸部材7から離れるに従って
徐々に外径寸法が小さくなるよう傾斜した傘状部材13
のテーパー部13aによって、テーパー部13aに当接
しているボール9は駆動軸側スリーブ4a外周に突出す
る。 【0013】なお、出力軸部材7には駆動軸側スリーブ
4aとほぼ同寸法の外径を有する出力軸側スリーブ7a
が設けられており、この出力軸側スリーブ7aには、出
力軸側スリーブ7a及び駆動軸側スリーブ4a外周上に
位置するクラッチスプリング6の一端部を固定する固定
部14a及びクラッチスプリング6端面と当接しクラッ
チスプリング6の軸方向の位置を規制する出力軸側スリ
ーブ7a外周上にに突出した突出部14bが設けられて
いる。また、クラッチスプリング6の固定部14aに固
定される端部は図11に示すように折り曲げられてお
り、これによって軸方向移動不能に取付けられている。 【0014】クラッチスプリング6の駆動軸部材4側の
端部6aは自由端となっており、ビット10及び出力軸
部材7が軸方向に移動する際には連動して軸方向に移動
する。 【0015】ねじ締め付け作業時には、ビット10及び
出力軸部材7がスプリング15に抗して軸方向移動する
と、クラッチスプリング6の駆動軸部材4側の端部6a
は出力軸部材7に連動して軸方向移動し、ボール9の外
周上に位置する。このビット10及び出力軸部材7の移
動と共に傘状部材13が軸方向移動し、傘状部材13の
テーパー部13aの作用によってボール9は駆動軸側ス
リーブ4aの外周上に突出する。このため、クラッチス
プリング6の駆動軸部材4側の端部6aとボール9とは
回転方向に当接可能となり、モータの回転力がギヤ5、
駆動軸部材4、ボール9を介してクラッチスプリング6
に伝達される。 【0016】クラッチスプリング6は電動機が正回転で
ある時には、外径寸法を小さくするよう変形し、駆動軸
側スリーブ7a外周及び出力軸側スリーブ4a外周上に
巻き付き、両者部材を一体に回転させるよう働き、これ
によって駆動軸部材4の回転力がクラッチスプリング6
を介して出力軸部材7に伝達され、ビット10が回転し
てねじ締め作業が行われる。 【0017】なお、ねじ締め付け作業が進むと、ストッ
パスリーブ13の端面が被締付部材に当接するが、その
ねじが締めつけられるに伴って、ビット10及び出力軸
部材7はスプリング15の押圧力によってビット10先
端側に軸方向移動する。ビット10及び出力軸部材7が
ビット10先端側に所定量移動した際に傘状部材13の
テーパー部13aに当接し駆動軸側スリーブ4a外周上
に突出していたボール9が突出しなくなる。これによっ
てクラッチスプリング6の駆動軸側スリーブ4a外周上
及び出力軸側スリーブ7a外周上への巻き付きが解除さ
れ、出力軸部材7及びビット10の回転伝達が遮断さ
れ、ねじ締め作業が終了する。 【0018】一方、逆回転のねじ緩め作業においては、
駆動軸部材4の回転力がワンウェイクラッチ16を介し
て出力軸部材7の軸部7bに伝達されるため、電動機を
回動させればクラッチスプリング6の状態にかかわらず
ビット10を回動させ、ねじ緩め作業を行うことができ
る。 【0019】 【発明が解決しようとする課題】上記したような従来の
ねじ締め機は、逆回転のねじ緩め作業時に、駆動軸部材
4の回転開始と同時にワンウェイクラッチ16の内周部
で軸部7bが軸方向移動するとワンウェイクラッチ16
と軸部7bが空転する傾向が見受けられるものである。
このように、逆回転時にワンウェイクラッチ16が空転
してしまうと、クラッチスプリング6には図12に矢印
で示す方向の力が加わることになり、これによって図1
5に示すようにクラッチスプリング6の端部6aとボー
ル9とが駆動軸部材4の回転方向において当接し、クラ
ッチスプリング6には図12に矢印で示す方向の力が加
わることになり、クラッチスプリング6は半径方向に広
がるように変形してしまい、短時間で塑性変形や断線
し、ねじ締め機が正常な動作を行うことができなくな
る、もしくは使用不能となってしまうという問題があっ
た。 【0020】本発明の目的は、上記欠点を解消し、逆回
転時にワンウェイクラッチが空転してしまうことを抑制
し、長寿命なねじ締め機を提供することである。 【0021】 【課題を解決するための手段】上記目的は、一方の軸部
材に取付けられたワンウェイクラッチ内を軸方向移動可
能な他方の軸部材の軸部と、ワンウェイクラッチ内周と
の間に、軸部に対して回転不能かつ軸方向移動可能で、
ワンウェイクラッチに対して軸方向移動不能な筒状部材
を設けることにより達成される。 【発明の実施の形態】本発明ねじ締め機の一実施形態を
図1〜図3を用いて以下説明する。なお、図1は本発明
ねじ締め機の一実施形態を示す要部拡大断面図、図2は
図1の要部拡大図、図3は図2のA−A線断面図であ
る。なお、図10に示した従来のねじ締め機と同構成の
部位には同様の符号を付したので説明を省略する。 【0022】図に示すように、本実施形態のねじ締め機
は、駆動軸部材4の駆動側スリーブ4a内に取付けられ
たワンウェイクラッチ16が取付けられており、このワ
ンウェイクラッチ16内周側には出力軸部材7の軸部7
bが配置されている。 【0023】なお、出力軸部材7は軸方向移動可能に設
けられており常時スプリング15によってビット10先
端側に押圧されており、スプリング15の押圧力に抗し
て出力軸部材7側に軸方向移動した際には軸部7bがワ
ンウェイクラッチ16内周でワンウェイクラッチ16に
対して軸方向移動する。 【0024】図に示すように出力軸部材7の軸部7bと
ワンウェイクラッチ16との間には筒状部材17が設け
られている。この筒状部材17はワンウェイクラッチ1
6に対して軸方向移動不能に設けられていると共に、図
3に示すように内周側に突出する複数(4個)の凸部1
7aを有する形状をしている。 【0025】出力軸部材7の軸部7bには筒状部材17
の凸部17aと回転方向において係合可能な軸方向に延
びた凹溝7cが設けられており、この凸部17a及び凹
溝7cの係合によって出力軸部材7の軸部7bと筒状部
材17とは一体的に回転する。このように出力軸部材7
の軸部7bは筒状部材17に対して回転不能であるが、
凹溝7cが軸方向に延びる形状をしているため、軸部7
bは筒状部材17に対して軸方向移動可能となってい
る。 【0026】上記したような構成をしたねじ締め機は、
図示しない電動機が正回転である際には、ワンウェイク
ラッチ16内を筒状部材17及び出力軸部材7の軸部7
bが回転可能であるが、電動機が逆回転である際には、
ワンウェイクラッチ16の作用によって筒状部材17及
び出力軸部材7の軸部7bはワンウェイクラッチ16内
を回転不能となる。 【0027】従って、従来のねじ締め機と同様に、電動
機が正回転であるねじ締め作業を行うことができると共
に電動機が逆回転であるねじ緩め作業を行うことができ
るものであるのに加えて、電動機が逆回転である際にワ
ンウェイクラッチ16が空転してしまう傾向にある状
態、すなわち駆動軸部材4の回転開始と同時にワンウェ
イクラッチ16の内周部で軸部7bが軸方向移動する状
態が発生したとしても、出力軸部材7の軸部7bはワン
ウェイクラッチ16に対して軸方向移動可能であるが、
ワンウェイクラッチ16内周部に当接している筒状部材
17はワンウェイクラッチ16に対して軸方向移動不能
であるために、ワンウェイクラッチ16が空転してしま
うことを抑制することができるようになる。これによっ
て、電動機が逆回転である際に、クラッチスプリング6
とボール9とが当接してしまうことを抑制することがで
き、クラッチスプリング6が塑性変形や断線してしまう
ことを抑制することができるようになる。 【0028】次に本発明ねじ締め機の他の実施形態を図
4〜図6を用いて説明する。 【0029】上記した実施形態では出力軸部材7の軸部
7bと筒状部材17との回転を規制する回転規制手段
を、筒状部材17の内周側に突出する凸部17aとこの
凸部17aと係合可能な凹溝7cとにより構成したもの
であったが、本実施形態では、この回転規制手段を他部
材を用いて構成したものである。 【0030】図に示すように筒状部材17には内周面に
凹溝17bが設けられていると共に、出力軸部材7の軸
部7bには筒状部材17の凹溝17bと断面形状がほぼ
同形状の軸方向に延びた凹溝7dが設けられており、こ
の凹溝17b及び凹溝7d内にはキー部材18が介在さ
れている。 【0031】このような構成としても、上記図1〜図3
に示した実施形態と同様の作用効果を奏し得ることがで
きるものである。 【0032】次に本発明ねじ締め機の他の実施形態を図
7〜図9を用いて説明する。 【0033】本実施形態では出力軸部材7の軸部7bと
筒状部材17との回転を規制する回転規制手段を、筒状
部材17の凹部17c、出力軸部材7の軸部7bの凹溝
7e及び凹部17cと凹溝7e間に配置されるボール1
9とにより構成したものである。 【0034】図に示すように筒状部材17には内周面に
凹溝17bが設けられていると共に、出力軸部材7の軸
部7bには筒状部材17の凹溝17bと断面形状がほぼ
同形状の軸方向に延びた凹溝7cが設けられており、こ
の凹溝17b及び凹溝7c内にはキー部材18が介在さ
れている。 【0035】このような構成としても、上記図1〜図3
に示した実施形態と同様の作用効果を奏し得ることがで
きるものである。 【0036】なお、上記実施形態では、正回転時に駆動
軸側部材4と出力軸部材7とを一体的に回転させるよう
働くクラッチスプリング6の端部を固定する固定側の軸
部材を出力軸部材7とし、出力軸部材7の軸方向移動に
連動してクラッチスプリング6の端部6aと当接可能と
なるボール9を保持する軸部材を駆動軸側部材4とした
が、これらは逆の関係、すなわちクラッチスプリング6
の端部を固定する固定側の軸部材を駆動軸部材4とし、
ボール9を保持する部材を出力軸部材7としても良いも
のである。 【0037】 【発明の効果】本発明によれば、一方の軸部材に取付け
られたワンウェイクラッチ内を軸方向移動可能な他方の
軸部材の軸部と、ワンウェイクラッチ内周との間に、軸
部に対して回転不能かつ軸方向移動可能で、ワンウェイ
クラッチに対して軸方向移動不能な筒状部材を設けた構
成としたことにより、電動機が逆回転である際にワンウ
ェイクラッチが空転してしまう傾向にある状態、すなわ
ちワンウェイクラッチを取付ける側の軸部材の回転開始
と同時にワンウェイクラッチの内周部で他方の軸部材の
軸部が軸方向移動する状態が発生したとしても、ワンウ
ェイクラッチ内周部に当接している筒状部材はワンウェ
イクラッチに対して軸方向移動不能であるために、ワン
ウェイクラッチが空転してしまうことを抑制することが
でき、長寿命なねじ締め機を提供することができるよう
になる。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screwdriver (electric board driver) used for screwing gypsum boards or the like used for ceilings and walls. . 2. Description of the Related Art A screwdriver such as an electric screwdriver is mainly used for a material to be tightened such as a gypsum board. In this screw tightening machine, it is necessary to set the screw tightening depth position to a certain depth for screw tightening work, so a stopper that can adjust the axial movement is provided in a part of the main body, and during screw tightening work When the main body moves to a position where the stopper comes into contact with the member to be fastened, an adjusting mechanism of a screw tightening depth for performing a clutch disconnecting operation is provided. On the other hand, in the case of a screw loosening operation at the time of reverse rotation, a mechanism in which power is transmitted by a one-way clutch is provided. [0003] Japanese Patent Application Laid-Open No. Hei 8-
FIG. 1 shows a screw tightening machine disclosed in US Pat.
This will be described below with reference to FIG. In FIG. 10, a stopper sleeve 3 is screwed and attached to the tip of a housing 2 of a screw tightening machine. By rotating the stopper sleeve 3 with respect to the housing 2, the relative distance between the stopper sleeve 3 and the housing 2 can be adjusted, whereby the screw feed distance (screw tightening depth) can be adjusted. In the housing 2, a pinion 19 attached to an output shaft of an electric motor (not shown) meshes with a gear 5 provided on the outer periphery of the drive shaft member 4.
The rotation of the motor is transmitted to the drive shaft member 4 via the gear 5 because the gear 5 and the gear 5 are integrated in the rotation direction. As shown in FIG. 11, the clutch spring 6, which is a compression spring, is left-handed and has an upper end and a lower end extending in the axial direction. An output shaft member 7 having an engaging ball 18 for accommodating the bit 10 so as to be integrally rotatable by the engaging ball 18 is supported by a metal portion 8 so as to be rotatable and axially movable, and at the same time the bit 10 side. The movement position to is restricted. The output shaft member 7 has a shaft portion 7b located in the one-way clutch 16 held in the drive shaft side sleeve 4a of the drive shaft member 4, and the shaft portion 7b of the output shaft member 7 In addition to being movable in the direction, the one-way clutch 16 can rotate only one rotation direction (screw tightening direction) with respect to the one-way clutch 16. A lock member 12 is provided at the end of the stopper sleeve 3 on the drive shaft member 4 side so as to be non-rotatable and movable in the axial direction, and is constantly urged toward the stopper sleeve 3 by a compression spring 11. Normally, a claw portion having a concave-convex shape, which is provided so as to mesh with the stopper sleeve 3 and the lock member 12, is engaged with the contact portion between the stopper sleeve 3 and the lock member 12.
Therefore, when the claw portion of the stopper sleeve 3 and the claw portion of the lock member 12 are engaged with each other, the stopper sleeve 3
Is non-rotatable with respect to the housing 2 and its axial position is fixed. To adjust the screw tightening depth, the operator slides the lock member 12 toward the drive shaft member 4 against the compression spring 11 so that the stopper sleeve 3 and the lock member 12
By rotating the stopper sleeve 3 with respect to the housing 2 in a state in which the engagement with the claw portion is released, this can be performed. At the end of the output shaft member 7 opposite to the bit 10, an umbrella-shaped member 1 provided in the drive shaft member 4 so as to be movable in the axial direction.
3 is in contact with the ball 9 provided radially movably in a through hole 4b provided in the drive shaft side sleeve 4a on a tapered portion 13a on the outer periphery of the umbrella-shaped member 13. The umbrella-shaped member 13 is constantly pressed toward the output shaft member 7 by a spring 15. In the state shown in FIG. 10, the bit 10 and the output shaft member 7 are moved downward in the figure by the pressing force of the spring 15 via the umbrella-shaped member 13, and the tip of the bit 10 projects beyond the tip of the stopper sleeve 3. It is in a state of having done. When the screw tightening operation is started from this state, the bit 10 and the output shaft member 7 move axially upward in the drawing while resisting the pressing force of the spring 15 via the umbrella-shaped member 13. When the bit 10 and the output shaft member 7 move in the axial direction, the umbrella-shaped member 13 is inclined so that the outer diameter gradually decreases as the bit 10 and the output shaft member 7 move away from the output shaft member 7.
The ball 9 in contact with the tapered portion 13a protrudes to the outer periphery of the drive shaft side sleeve 4a by the tapered portion 13a. The output shaft member 7 has an output shaft side sleeve 7a having substantially the same outer diameter as the drive shaft side sleeve 4a.
The output shaft-side sleeve 7a is provided with a fixing portion 14a for fixing one end of the clutch spring 6 located on the outer periphery of the output shaft-side sleeve 7a and the drive shaft-side sleeve 4a and an end face of the clutch spring 6. A protruding portion 14b is provided on the outer periphery of the output shaft side sleeve 7a for regulating the position of the contact clutch spring 6 in the axial direction. The end of the clutch spring 6 fixed to the fixing portion 14a is bent as shown in FIG. 11, so that the clutch spring 6 is mounted so as not to move in the axial direction. The end 6a of the clutch spring 6 on the drive shaft member 4 side is a free end, and moves in the axial direction in conjunction with the movement of the bit 10 and the output shaft member 7 in the axial direction. During the screw tightening operation, when the bit 10 and the output shaft member 7 move axially against the spring 15, the end 6a of the clutch spring 6 on the drive shaft member 4 side.
Moves axially in conjunction with the output shaft member 7 and is located on the outer periphery of the ball 9. The umbrella member 13 moves in the axial direction along with the movement of the bit 10 and the output shaft member 7, and the ball 9 projects on the outer periphery of the drive shaft side sleeve 4a by the action of the tapered portion 13a of the umbrella member 13. For this reason, the end 6a of the clutch spring 6 on the drive shaft member 4 side and the ball 9 can be brought into contact in the rotational direction, and the rotational force of the motor
Clutch spring 6 via drive shaft member 4 and ball 9
Is transmitted to. When the motor is rotating forward, the clutch spring 6 is deformed so as to reduce the outer diameter, and is wound around the outer periphery of the drive shaft side sleeve 7a and the outer periphery of the output shaft side sleeve 4a to rotate both members integrally. And the rotational force of the drive shaft member 4 is reduced by the clutch spring 6.
Is transmitted to the output shaft member 7, and the bit 10 is rotated to perform a screw tightening operation. As the screw tightening operation proceeds, the end surface of the stopper sleeve 13 comes into contact with the member to be tightened. As the screw is tightened, the bit 10 and the output shaft member 7 are pressed by the pressing force of the spring 15. It moves axially to the tip side of the bit 10. When the bit 10 and the output shaft member 7 move to the tip side of the bit 10 by a predetermined amount, the ball 9 that has come into contact with the tapered portion 13a of the umbrella-shaped member 13 and protrudes on the outer periphery of the drive shaft side sleeve 4a does not protrude. Thereby, the winding of the clutch spring 6 around the outer periphery of the drive shaft side sleeve 4a and the outer periphery of the output shaft side sleeve 7a is released, the rotation transmission of the output shaft member 7 and the bit 10 is interrupted, and the screw tightening operation is completed. On the other hand, in the reverse rotation screw loosening operation,
Since the torque of the drive shaft member 4 is transmitted to the shaft portion 7b of the output shaft member 7 via the one-way clutch 16, if the motor is rotated, the bit 10 is rotated regardless of the state of the clutch spring 6, A screw loosening operation can be performed. In the conventional screw tightening machine as described above, at the time of reverse rotation screw loosening operation, the shaft portion is formed on the inner peripheral portion of the one-way clutch 16 simultaneously with the start of rotation of the drive shaft member 4. When 7b moves in the axial direction, the one-way clutch 16
And a tendency that the shaft portion 7b idles.
As described above, when the one-way clutch 16 idles during the reverse rotation, a force is applied to the clutch spring 6 in a direction indicated by an arrow in FIG.
As shown in FIG. 5, the end 6a of the clutch spring 6 and the ball 9 come into contact with each other in the rotation direction of the drive shaft member 4, and a force is applied to the clutch spring 6 in the direction indicated by the arrow in FIG. No. 6 is deformed so as to expand in the radial direction, causing plastic deformation or disconnection in a short time, and there is a problem that the screw tightening machine cannot perform a normal operation or becomes unusable. An object of the present invention is to solve the above-mentioned drawbacks, to suppress the one-way clutch from idling at the time of reverse rotation, and to provide a long-life screw tightening machine. An object of the present invention is to provide a method of manufacturing a one-way clutch, comprising the steps of: providing a shaft between a shaft portion of another shaft member axially movable in a one-way clutch attached to one shaft member and an inner periphery of the one-way clutch; , Non-rotatable and axially movable with respect to the shaft,
This is achieved by providing a cylindrical member that cannot move in the axial direction with respect to the one-way clutch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the screw tightening machine of the present invention will be described below with reference to FIGS. 1 is an enlarged sectional view of a main part showing an embodiment of the screw tightening machine of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. Note that the same reference numerals are given to portions having the same configuration as the conventional screw tightening machine shown in FIG. 10, and a description thereof will be omitted. As shown in the drawing, the screw tightening machine of the present embodiment has a one-way clutch 16 mounted in a drive-side sleeve 4a of the drive shaft member 4, and a one-way clutch 16 is provided on the inner peripheral side. Shaft 7 of output shaft member 7
b is arranged. The output shaft member 7 is provided so as to be movable in the axial direction, and is constantly pressed toward the tip end of the bit 10 by a spring 15, and is axially moved toward the output shaft member 7 against the pressing force of the spring 15. When moved, the shaft portion 7b moves in the axial direction relative to the one-way clutch 16 on the inner periphery of the one-way clutch 16. As shown in the drawing, a cylindrical member 17 is provided between the shaft portion 7b of the output shaft member 7 and the one-way clutch 16. The cylindrical member 17 is a one-way clutch 1
6, a plurality of (four) convex portions 1 protruding toward the inner peripheral side as shown in FIG.
7a. A cylindrical member 17 is provided on the shaft portion 7b of the output shaft member 7.
Is provided with an axially extending concave groove 7c which can be engaged with the convex portion 17a of the output shaft member 7 by the engagement of the convex portion 17a and the concave groove 7c. 17 and rotates together. Thus, the output shaft member 7
Shaft part 7b cannot rotate with respect to the cylindrical member 17,
Since the concave groove 7c has a shape extending in the axial direction, the shaft 7
b is axially movable with respect to the cylindrical member 17. The screw tightening machine configured as described above
When the electric motor (not shown) is rotating forward, the one-way clutch 16 moves inside the cylindrical member 17 and the shaft 7 of the output shaft member 7.
b is rotatable, but when the motor is in reverse rotation,
By the action of the one-way clutch 16, the cylindrical member 17 and the shaft portion 7b of the output shaft member 7 cannot rotate inside the one-way clutch 16. Therefore, similarly to the conventional screw tightening machine, it is possible to perform a screw tightening operation in which the electric motor rotates forward and to perform a screw loosening operation in which the electric motor rotates reversely. The state in which the one-way clutch 16 tends to run idle when the motor rotates in the reverse direction, that is, the state in which the shaft portion 7b moves in the axial direction on the inner peripheral portion of the one-way clutch 16 simultaneously with the start of rotation of the drive shaft member 4. Even if it occurs, the shaft portion 7b of the output shaft member 7 can move in the axial direction with respect to the one-way clutch 16,
Since the cylindrical member 17 that is in contact with the inner peripheral portion of the one-way clutch 16 cannot move in the axial direction with respect to the one-way clutch 16, it is possible to suppress the one-way clutch 16 from idling. This allows the clutch spring 6 to rotate when the motor rotates in the reverse direction.
And the ball 9 can be prevented from contacting each other, and the plastic deformation and disconnection of the clutch spring 6 can be suppressed. Next, another embodiment of the screw tightening machine of the present invention will be described with reference to FIGS. In the above-described embodiment, the rotation restricting means for restricting the rotation of the shaft portion 7b of the output shaft member 7 and the cylindrical member 17 includes the convex portion 17a projecting toward the inner peripheral side of the cylindrical member 17 and the convex portion 17a. In the present embodiment, the rotation restricting means is formed by using another member. As shown in the figure, the cylindrical member 17 is provided with a concave groove 17b on the inner peripheral surface, and the shaft portion 7b of the output shaft member 7 has the concave groove 17b of the cylindrical member 17 and the sectional shape. An axially extending groove 7d having substantially the same shape is provided, and a key member 18 is interposed in the groove 17b and the groove 7d. With such a configuration, the above-described FIGS.
The same operation and effects as those of the embodiment shown in FIG. Next, another embodiment of the screw tightening machine of the present invention will be described with reference to FIGS. In this embodiment, the rotation restricting means for restricting the rotation of the shaft portion 7b of the output shaft member 7 and the cylindrical member 17 is provided by a concave portion 17c of the cylindrical member 17 and a concave groove of the shaft portion 7b of the output shaft member 7. 7e and ball 1 arranged between concave portion 17c and concave groove 7e
9. As shown in the figure, the cylindrical member 17 is provided with a concave groove 17b on the inner peripheral surface, and the shaft portion 7b of the output shaft member 7 has the same sectional shape as the concave groove 17b of the cylindrical member 17. An axially extending groove 7c having substantially the same shape is provided, and a key member 18 is interposed in the grooves 17b and 7c. With such a configuration, the above-described FIGS.
The same operation and effects as those of the embodiment shown in FIG. In the above embodiment, the fixed shaft member for fixing the end of the clutch spring 6 which works to rotate the drive shaft member 4 and the output shaft member 7 integrally during the forward rotation is used as the output shaft member. 7, the drive shaft side member 4 is a shaft member that holds a ball 9 that can be brought into contact with the end 6a of the clutch spring 6 in conjunction with the axial movement of the output shaft member 7. That is, the clutch spring 6
A shaft member on the fixed side for fixing the end of the shaft is a drive shaft member 4,
The member holding the ball 9 may be the output shaft member 7. According to the present invention, the shaft between the shaft portion of the other shaft member which is axially movable in the one-way clutch attached to one shaft member and the inner periphery of the one-way clutch is provided. The one-way clutch idles when the electric motor rotates in the reverse direction by providing a cylindrical member that is not rotatable with respect to the part and is axially movable with respect to the one-way clutch, and is not movable with respect to the one-way clutch. Even if a state in which there is a tendency, that is, a state in which the shaft portion of the other shaft member moves in the axial direction on the inner peripheral portion of the one-way clutch at the same time as the rotation start of the shaft member on which the one-way clutch is mounted occurs, Because the cylindrical member that is in contact with the one-way clutch cannot move in the axial direction with respect to the one-way clutch, it is possible to suppress the one-way clutch from idling. Thus, a long-life screwdriver can be provided.

【図面の簡単な説明】 【図1】本発明ねじ締め機の一実施形態を示す要部断面
図。 【図2】図1の要部拡大図。 【図3】図2のA−A線断面図。 【図4】本発明ねじ締め機の他の実施形態を示す要部断
面図。 【図5】図4の要部拡大図。 【図6】図5のB−B線断面図。 【図7】本発明ねじ締め機の他の実施形態を示す要部断
面図。 【図8】図7の要部拡大図。 【図9】図8のC−C線断面図。 【図10】従来のねじ締め機の一例を示す要部断面図。 【図11】従来のクラッチスプリングの一例を示す斜視
図。 【図12】従来のクラッチスプリングの一例を示す斜視
図。 【図13】従来のねじ締め機の一動作状態を示す要部拡
大断面図。 【符号の説明】 1はねじ締め機、2はハウジング、3はストッパスリー
ブ、4は駆動軸部材、4aは駆動軸側スリーブ、5はギ
ヤ、6はクラッチスプリング、6aはクラッチスプリン
グの端部、7は出力軸部材、7aは出力軸側スリーブ、
7bは軸部、7c、7dは凹溝、7eは凹部、8はメタ
ル部材、9はボール、10はビット、11は圧縮ばね、
12はロック部材、13は傘状部材、13aはテーパー
部、14aは固定部、15はスプリング、16はワンウ
ェイクラッチ、17は筒状部材、17aは凸部、18は
キー部材、19はボールである。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a main part showing an embodiment of the screw tightening machine of the present invention. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a sectional view taken along line AA of FIG. 2; FIG. 4 is a sectional view of a main part showing another embodiment of the screw tightening machine of the present invention. FIG. 5 is an enlarged view of a main part of FIG. 4; FIG. 6 is a sectional view taken along line BB of FIG. 5; FIG. 7 is a sectional view of a main part showing another embodiment of the screw tightening machine of the present invention. FIG. 8 is an enlarged view of a main part of FIG. 7; FIG. 9 is a sectional view taken along line CC of FIG. 8; FIG. 10 is a sectional view of an essential part showing an example of a conventional screw tightening machine. FIG. 11 is a perspective view showing an example of a conventional clutch spring. FIG. 12 is a perspective view showing an example of a conventional clutch spring. FIG. 13 is an enlarged sectional view of a main part showing an operation state of a conventional screw tightening machine. [Description of References] 1 is a screw tightener, 2 is a housing, 3 is a stopper sleeve, 4 is a drive shaft member, 4a is a drive shaft side sleeve, 5 is a gear, 6 is a clutch spring, 6a is an end of a clutch spring, 7 is an output shaft member, 7a is an output shaft side sleeve,
7b is a shaft portion, 7c and 7d are concave grooves, 7e is a concave portion, 8 is a metal member, 9 is a ball, 10 is a bit, 11 is a compression spring,
12 is a lock member, 13 is an umbrella member, 13a is a tapered portion, 14a is a fixed portion, 15 is a spring, 16 is a one-way clutch, 17 is a cylindrical member, 17a is a convex portion, 18 is a key member, and 19 is a ball. is there.

Claims (1)

【特許請求の範囲】 【請求項1】 正逆回転可能な電動機と、該電動機から
の動力を伝達する駆動軸部材と、ビットを保持し、軸方
向に移動可能に支持された出力軸部材と、前記出力軸部
材と前記駆動軸部材間とを互いに離隔させるよう作用す
る押圧手段と、前記駆動軸部材と前記出力軸部材の同軸
上に、各々の円筒面にまたがってコイル状に配設され、
前記出力軸部材及び前記駆動軸部材のどちらか一方に一
部が固定され、かつ他方の部材に前記出力軸部材の移動
に応じて係止可能なクラッチスプリングと、前記駆動軸
部材と前記出力軸部材のいずれか一方の軸部材に取付け
られたワンウェイクラッチと、他方の軸部材に設けられ
前記ワンウェイクラッチ内周に軸方向移動可能に配置さ
れる軸部とを有するねじ締め装置であって、前記他方の
軸部材の軸部と前記ワンウェイクラッチ内周との間に、
前記軸部材に対して回転不能かつ軸方向移動可能で、前
記ワンウェイクラッチに対して軸方向移動不能な筒状部
材を設けたことを特徴とするねじ締め機。
Claims: 1. An electric motor capable of rotating forward and reverse, a drive shaft member for transmitting power from the electric motor, and an output shaft member holding a bit and supported movably in the axial direction. Pressing means for acting to separate the output shaft member and the drive shaft member from each other; and coaxially disposed between the drive shaft member and the output shaft member in a coil shape over each cylindrical surface. ,
A clutch spring partially fixed to one of the output shaft member and the drive shaft member and capable of being locked to the other member in accordance with the movement of the output shaft member, the drive shaft member and the output shaft A one-way clutch attached to any one of the shaft members, and a screw tightening device having a shaft portion provided on the other shaft member and axially movable around the one-way clutch inner periphery, Between the shaft portion of the other shaft member and the inner circumference of the one-way clutch,
A screwing machine comprising: a cylindrical member that cannot rotate with respect to the shaft member and can move in the axial direction, and cannot move in the axial direction with respect to the one-way clutch.
JP2002032411A 2002-02-08 2002-02-08 Normal and reverse rotating bolt fastener Pending JP2003231066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002032411A JP2003231066A (en) 2002-02-08 2002-02-08 Normal and reverse rotating bolt fastener

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002032411A JP2003231066A (en) 2002-02-08 2002-02-08 Normal and reverse rotating bolt fastener

Publications (1)

Publication Number Publication Date
JP2003231066A true JP2003231066A (en) 2003-08-19

Family

ID=27775541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002032411A Pending JP2003231066A (en) 2002-02-08 2002-02-08 Normal and reverse rotating bolt fastener

Country Status (1)

Country Link
JP (1) JP2003231066A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009297838A (en) * 2008-06-13 2009-12-24 Hitachi Koki Co Ltd Power tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009297838A (en) * 2008-06-13 2009-12-24 Hitachi Koki Co Ltd Power tool

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