JP4505996B2 - Remote bolt unscrewing confirmation mechanism - Google Patents

Remote bolt unscrewing confirmation mechanism Download PDF

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Publication number
JP4505996B2
JP4505996B2 JP2001015578A JP2001015578A JP4505996B2 JP 4505996 B2 JP4505996 B2 JP 4505996B2 JP 2001015578 A JP2001015578 A JP 2001015578A JP 2001015578 A JP2001015578 A JP 2001015578A JP 4505996 B2 JP4505996 B2 JP 4505996B2
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JP
Japan
Prior art keywords
bolt
remote
remote bolt
screw
head
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.)
Expired - Fee Related
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JP2001015578A
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Japanese (ja)
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JP2002219660A (en
Inventor
彰 伊藤
弘道 前川
智輝 山口
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IHI Corp
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IHI Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、マニピュレータ等の遠隔操作手段によって締め付け・緩め操作される遠隔ボルトの緩め時において、螺合解除を確認する遠隔ボルトの螺合解除確認機構に関する。
【0002】
【従来の技術】
原子力施設等の作業者の立ち入りが制限される場所における部品や装置の交換作業は、マニピュレータを用いた遠隔操作によって行われる。
【0003】
図5にこのような遠隔操作によって交換される部品の一例の概念図を示す。(A)は平面図,(B)は縦断面図である。
【0004】
図示構成例は、被固定部材である部品1がその固定フランジ1Aに脱落不能に設けられた遠隔ボルト30によって固定対象2の設置部位に締着固定されており、部品1を交換する際には、マニピュレータで把持したインパクトレンチによって遠隔ボルト30を緩めて被締着部位のメネジ(ナット2A)との螺合を解除し、マニピュレータによって部品1を遠隔ボルト30と共に取り外した後、新たな部品1を設置位置に位置させて遠隔ボルト30を締め込んで固定するようになっている。
【0005】
遠隔ボルト30は、図6に拡大断面図を示すようにその頭部31とネジ部33との間にそのネジの谷の径より小径で所定長さの係合小径部32を有して形成され、その先端のネジ部33が固定フランジ1Aに固定された所定高さの天面を有する円筒状のボルトカラー50の天面51を螺合・貫通し、これによって図中想像線で示すように頭部31を引き上げてもネジ部33が蓋部に干渉して脱落しないように設けられているものである。
【0006】
【発明が解決しようとする課題】
ところで、上記のごとき構成の遠隔ボルトによって締結された被固定部材を交換する際には、複数ある遠隔ボルトをマニピュレータで把持したインパクトレンチによって順次緩めて全てを螺合解除するが、その際、既に螺合解除した遠隔ボルトが他の遠隔ボルトを緩める際の振動によって再度螺合してしまう現象が生ずることがある。そのような状態で被固定部材を外そうとすると遠隔ボルトのネジ部や相手側のメネジが破損して再使用が不能となってしまう虞があり、このため、遠隔ボルトを持ち上げて螺合していないことを確認することが必要となる。
【0007】
この螺合解除確認作業は、遠隔ボルトがマニピュレータによって直接把持することのできない狭隘部に配設されていることが多いために、マニピュレータに把持するインパクトレンチを図7(A)に示すような支持バー部71の先端に引っ掛けフォーク部72を備えた螺合解除確認専用工具70に持ち替え、(B)に示すようにその引っ掛けフォーク部72を遠隔ボルト30の頭部31に引っ掛けて持ち上げることで行われている。
【0008】
しかしながら、上記のごとき螺合解除確認作業は、マニピュレータを工具類の格納場所に移動させてインパクトレンチを螺合解除確認専用工具に持ち替え、再度作業位置に戻さなければならないため、これらの工具の持ち替え及びそれに係るマニピュレータの移動が面倒で時間を要するという問題があった。
【0009】
本発明は、上記問題に鑑みてなされたものであって、遠隔ボルトの螺合解除確認作業をインパクトレンチを螺合解除確認専用工具に持ち替えることなく行うことができ、合理的な作業によって作業時間を短縮できる遠隔ボルトの螺合解除確認機構を提供することを目的とする。
【0010】
【課題を解決する為の手段】
上記目的を達成する本発明の遠隔ボルトの螺合解除確認装置は、被固定部材に脱落不能に設けられた遠隔ボルトを、操作腕手段に把持した回転操作工具に装着されたレンチソケットを前記遠隔ボルトのボルト頭に嵌合させて締め付け・緩め操作する遠隔ボルトの締め付け・緩め装置において、前記レンチソケットには、付勢手段によって係止部材がそのボルト頭嵌合凹部内に向けて付勢されて成る摩擦係止機構が設けられており、該摩擦係止機構は前記ボルト頭嵌合凹部に嵌合したボルト頭に前記係止部材を押圧して前記レンチソケットに前記遠隔ボルトを支持し得るように構成されていることを特徴とする。
【0011】
【発明の実施の形態】
以下、添付図面を参照して本願発明の実施の形態について説明する。
【0012】
図1は本願発明に係る遠隔ボルトの螺合解除確認機構の一構成例を備えた回転操作工具としてのインパクトレンチ10と遠隔ボルト20を概念的に示す図である。
【0013】
インパクトレンチ10は、回転駆動機構を内蔵する本体部11から回転するスピンドル12が突出しており、そのスピンドル12の先端にはレンチソケット20が装着されている。本体部11には把持部11Aが突設されており、この把持部11Aが図示しない操作腕手段としてのマニピュレータによって把持されるようになっている。
【0014】
レンチソケット20は、その縦断面図である図2(A)及びそのB−B断面図である(B)に示すように、端部の連結部22を介してインパクトレンチ10のスピンドル12に結合されるようになっており、他端側に円柱状でその一方側に遠隔ボルト30の平面形状六角形の頭部31と対応する(嵌合可能な)ボルト頭嵌合凹部としての六角柱状の嵌合凹部21が開口形成され、この嵌合凹部21に摩擦係止機構23が設けられている。
【0015】
摩擦係止機構23は、図2(C)に縦断面図を示すように、円柱状のケーシング41内に収容された付勢手段としてのスプリング42で先端部の鋼球43を押圧付勢して構成されたボールプランジャ40が、嵌合凹部21の断面六角形を形成する隣接する3面にそれぞれ鋼球43を嵌合凹部21内に突出させて配設されて構成されている。
【0016】
ここで、3組のボールプランジャ40による押圧力は、嵌合凹部21に嵌合した遠隔ボルト30の頭部31を3面に配設されたボールプランジャ40がそれぞれ対向する側に頭部31を押圧付勢し、ボールプランジャ40の鋼球43と頭部31との間、及び、頭部31と嵌合凹部21の内面との間に生ずる摩擦力によって、レンチソケット20で遠隔ボルト30を支持し得るように設定されている。
【0017】
このような摩擦係止機構23を備えたレンチソケット20では、その嵌合凹部21に頭部31を嵌合させることにより、当該レンチソケット23を介して遠隔ボルト30を支持して持ち上げることができると共に、遠隔ボルト30が移動し得ない状態では嵌合凹部21から頭部31が抜けて分離する。
【0018】
上記のごとき摩擦係止機構23を有するレンチソケット20を、遠隔ボルト30の緩め作業時に用いることにより、図3(A)に示すごとくレンチソケット20を遠隔ボルト30の頭部31に嵌合させて図示しないインパクトレンチで回転操作して緩め、螺合解除した後インパクトレンチを退避動作(上昇)させると、レンチソケット20に支持された遠隔ボルト30もそれに伴って上昇し、そのネジ部32がカラー50の天面51と当接するとそれ以上の上昇が規制されて頭部31がレンチソケット20から抜け落ちる。つまり、これによって遠隔ボルト30の螺合解除が完全に行われていることを確認できるものである。
【0019】
また、多数ある遠隔ボルト30の螺合解除が全て完了した後、レンチソケット20を再度遠隔ボルト30の頭部31に嵌合して上昇操作を行って遠隔ボルト30を持ち上げることで、当該遠隔ボルト30が他の遠隔ボルト30を緩める際の振動によって再度螺合していないかどうか確認できる。そして、万一再螺合している場合には、インパクトレンチを駆動して螺合解除することができる。
【0020】
即ち、マニピュレータに把持したインパクトレンチを螺合解除確認専用工具に持ち替えることなく遠隔ボルト30の螺合解除確認作業を行うことができると共に、螺合解除後に再螺合している場合にもそのまま螺合解除操作することができ、極めて合理的に短時間で螺合解除作業を行うことができるものである。
【0021】
尚、上記構成例の摩擦係止機構23は3組のボールプランジャ40によって構成されているが、ボールプランジャ40の数はこれに限らず適宜変更可能なものである。
【0022】
また、摩擦係止機構はボールプランジャに限るものではない。例えば、図4に断面図を示すように、レンチソケット20の外面に一端が固定された板バネ60を、嵌合凹部21内に突出させて構成しても良い。この構成では、板バネ60が付勢手段と係止部材とを兼ねる。
【0023】
【発明の効果】
以上述べたように、本発明に係るボルト遠隔ボルトの螺合解除確認機構によれば、レンチソケットに、付勢手段によって係止部材がそのボルト頭嵌合凹部内に向けて付勢されて成る摩擦係止機構が設けられ、該摩擦係止機構はボルト頭嵌合凹部に嵌合したボルト頭に係止部材を押圧してレンチソケットに遠隔ボルトを支持し得るように構成されていることにより、螺合解除した後レンチソケットを上昇させると、支持された遠隔ボルトもそれに伴って上昇するために完全に螺合解除が行われたことが確認できる。また、多数ある遠隔ボルトの螺合解除が全て完了した後、レンチソケットを再度遠隔ボルトのボルト頭に嵌合して上昇操作を行って遠隔ボルトを持ち上げることで、当該遠隔ボルトが他の遠隔ボルトを緩める際の振動によって再度螺合していないかどうか確認でき、万一螺合している場合には、回転操作工具を駆動して螺合解除することができる。
【0024】
即ち、マニピュレータに把持した回転操作工具を螺合解除確認専用工具に持ち替えることなく遠隔ボルトの螺合解除確認作業を行うことができると共に、再螺合している場合にはそのまま螺合解除操作することができ、合理的に短時間で遠隔ボルトの螺合解除作業及び螺合解除確認作業を行うことが可能となるものである。
【図面の簡単な説明】
【図1】本願発明に係る遠隔ボルトの螺合解除確認機構の一構成例を備えた回転操作工具としてのインパクトレンチと遠隔ボルトを概念的に示す図である。
【図2】(A)はレンチソケットの縦断面図,(B)はそのB−B断面図,(C)はボールプランジャの縦断面図である。
【図3】遠隔ボルトの緩め作業時の説明図である。
【図4】摩擦係止機構のたの構成例を適用したレンチソケットの縦断面図である。
【図5】遠隔操作によって交換される部品の一例を示す概念図である。
【図6】遠隔ボルトの拡大断面図である。
【図7】従来例としての螺合解除確認専用工具及びその確認操作の説明図である。
【符号の説明】
10 インパクトレンチ(回転操作工具)
20 レンチソケット
21 嵌合凹部(ボルト頭嵌合凹部)
23 摩擦係止機構
30 遠隔ボルト
31 頭部(ボルト頭)
40 ボールプランジャ(摩擦係止機構)
42 スプリング(付勢手段)
43 鋼球(係止部材)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a remote bolt unscrewing confirmation mechanism for confirming screw unscrewing when a remote bolt that is tightened or loosened by a remote control means such as a manipulator is loosened.
[0002]
[Prior art]
Replacement work of parts and devices in places where entry of workers such as nuclear facilities is restricted is performed by remote operation using a manipulator.
[0003]
FIG. 5 shows a conceptual diagram of an example of parts exchanged by such remote operation. (A) is a plan view and (B) is a longitudinal sectional view.
[0004]
In the illustrated configuration example, the component 1 which is a member to be fixed is fastened and fixed to the installation site of the fixing object 2 by a remote bolt 30 which is provided on the fixing flange 1A so as not to fall off. Then, the remote bolt 30 is loosened by the impact wrench grasped by the manipulator to release the screwing with the female screw (nut 2A) of the tightened portion. After the part 1 is removed together with the remote bolt 30 by the manipulator, the new part 1 is removed. The remote bolt 30 is tightened and fixed at the installation position.
[0005]
As shown in the enlarged sectional view of FIG. 6, the remote bolt 30 has an engagement small-diameter portion 32 having a diameter smaller than that of the valley of the screw between the head portion 31 and the screw portion 33 and having a predetermined length. Then, the top 33 of the cylindrical bolt collar 50 having a top surface of a predetermined height fixed to the fixing flange 1A is screwed and penetrated by the screw portion 33 at the tip thereof, and as shown by an imaginary line in the figure. Even if the head 31 is pulled up, the screw portion 33 is provided so as not to interfere with the lid portion and fall off.
[0006]
[Problems to be solved by the invention]
By the way, when replacing the fixed member fastened by the remote bolt having the above-described configuration, the plurality of remote bolts are sequentially loosened by the impact wrench gripped by the manipulator, and all of them are unscrewed. A phenomenon may occur in which a remote bolt that has been unscrewed is re-engaged by vibration when another remote bolt is loosened. If you try to remove the member to be fixed in such a state, the screw part of the remote bolt or the female screw on the other side may be damaged, making it impossible to reuse it. It is necessary to confirm that it is not.
[0007]
In this screw release confirmation work, since the remote bolt is often disposed in a narrow portion where the manipulator cannot directly grip, the impact wrench gripped by the manipulator is supported as shown in FIG. The tool is replaced with a screw release confirmation dedicated tool 70 provided with a hook fork 72 at the tip of the bar 71, and the hook fork 72 is hooked on the head 31 of the remote bolt 30 and lifted as shown in FIG. It has been broken.
[0008]
However, the screw release confirmation work as described above requires moving the manipulator to the tool storage location, changing the impact wrench to the screw release confirmation dedicated tool, and returning it to the work position again. In addition, there is a problem that the movement of the manipulator related thereto is troublesome and requires time.
[0009]
The present invention has been made in view of the above-described problems, and can perform a screw release confirmation work of a remote bolt without changing an impact wrench to a screw release confirmation dedicated tool. It is an object of the present invention to provide a remote bolt unscrewing confirmation mechanism that can shorten the length of the bolt.
[0010]
[Means for solving the problems]
The device for confirming disengagement of a remote bolt according to the present invention that achieves the above object includes a wrench socket mounted on a rotary operation tool that holds a remote bolt that is provided on a fixed member so as not to fall off by an operating arm means. In the remote bolt tightening / loosening device which is engaged with the bolt head of the bolt and tightened / relaxed, the wrench socket has a locking member biased toward the bolt head fitting recess by the biasing means. The friction locking mechanism can support the remote bolt on the wrench socket by pressing the locking member against the bolt head fitted in the bolt head fitting recess. It is comprised as follows.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0012]
FIG. 1 is a view conceptually showing an impact wrench 10 and a remote bolt 20 as a rotary operation tool provided with a configuration example of a remote bolt screwing release confirmation mechanism according to the present invention.
[0013]
In the impact wrench 10, a rotating spindle 12 protrudes from a main body 11 incorporating a rotation drive mechanism, and a wrench socket 20 is attached to the tip of the spindle 12. The main body 11 is provided with a gripping portion 11A, and the gripping portion 11A is gripped by a manipulator as operating arm means (not shown).
[0014]
The wrench socket 20 is coupled to the spindle 12 of the impact wrench 10 via the end connecting portion 22 as shown in FIG. 2A which is a longitudinal sectional view thereof and (B) which is a BB sectional view thereof. Hexagonal columnar as a bolt head fitting recess corresponding to (possible to fit) a planar hexagonal head 31 of the remote bolt 30 on one side and a columnar shape on the other end side. A fitting recess 21 is formed as an opening, and a friction locking mechanism 23 is provided in the fitting recess 21.
[0015]
As shown in the longitudinal sectional view of FIG. 2C, the friction locking mechanism 23 presses and biases the steel ball 43 at the tip portion with a spring 42 as biasing means accommodated in a cylindrical casing 41. The ball plunger 40 configured as described above is configured by projecting steel balls 43 into the fitting recess 21 on three adjacent surfaces forming a hexagonal cross section of the fitting recess 21.
[0016]
Here, the pressing force by the three pairs of ball plungers 40 is such that the head 31 of the remote bolt 30 fitted in the fitting recess 21 is placed on the side where the ball plungers 40 arranged on the three sides face each other. The remote bolt 30 is supported by the wrench socket 20 by the pressing force and the frictional force generated between the steel ball 43 of the ball plunger 40 and the head 31 and between the head 31 and the inner surface of the fitting recess 21. Is set to be able to.
[0017]
In the wrench socket 20 provided with such a friction locking mechanism 23, the remote bolt 30 can be supported and lifted through the wrench socket 23 by fitting the head portion 31 into the fitting recess 21. At the same time, in a state where the remote bolt 30 cannot move, the head 31 is detached from the fitting recess 21 and separated.
[0018]
By using the wrench socket 20 having the friction locking mechanism 23 as described above when the remote bolt 30 is loosened, the wrench socket 20 is fitted to the head 31 of the remote bolt 30 as shown in FIG. When the impact wrench is retracted (lifted) after being loosened by rotating it with an impact wrench (not shown), and the screw is released, the remote bolt 30 supported by the wrench socket 20 also rises accordingly, and the screw portion 32 becomes the collar. When it abuts on the top surface 51 of 50, the further rise is restricted and the head 31 falls out of the wrench socket 20. In other words, it is possible to confirm that the remote bolt 30 has been completely unscrewed.
[0019]
Further, after all of the unscrewing of the remote bolts 30 are completed, the remote bolt 30 is lifted by fitting the wrench socket 20 to the head 31 of the remote bolt 30 again and lifting the remote bolt 30. It can be confirmed whether or not 30 is screwed again by vibrations when loosening other remote bolts 30. In the case of re-engagement, the impact wrench can be driven to release the screw.
[0020]
That is, it is possible to perform the screw release confirmation work of the remote bolt 30 without changing the impact wrench held by the manipulator to a screw release confirmation dedicated tool, and also when the screw is re-threaded after the screw release. The joint release operation can be performed, and the screw release operation can be performed in a very reasonable time.
[0021]
In addition, although the friction locking mechanism 23 of the said structural example is comprised by the 3 sets of ball plungers 40, the number of the ball plungers 40 is not restricted to this, It can change suitably.
[0022]
Further, the friction locking mechanism is not limited to the ball plunger. For example, as shown in a cross-sectional view in FIG. 4, a leaf spring 60 having one end fixed to the outer surface of the wrench socket 20 may be protruded into the fitting recess 21. In this configuration, the leaf spring 60 serves as both the urging means and the locking member.
[0023]
【The invention's effect】
As described above, according to the screw remote bolt disengagement confirmation mechanism according to the present invention, the locking member is urged by the urging means toward the bolt head fitting recess in the wrench socket. A friction locking mechanism is provided, and the friction locking mechanism is configured to be able to support the remote bolt on the wrench socket by pressing the locking member against the bolt head fitted in the bolt head fitting recess. When the wrench socket is raised after the screw release, the supported remote bolt is also raised accordingly, so that it can be confirmed that the screw release has been completely completed. In addition, after all the unscrewing of the remote bolts is completed, the remote bolt is lifted by engaging the wrench socket with the bolt head of the remote bolt again and lifting the remote bolt, so that the remote bolt can be connected to another remote bolt. It is possible to confirm whether or not the screw has been re-engaged by the vibration when loosening the screw, and in the event that it has been screwed, it is possible to release the screw by driving the rotary operation tool.
[0024]
That is, it is possible to perform the screw unscrewing confirmation work of the remote bolt without changing the rotation operation tool gripped by the manipulator to the screw unscrewing confirmation dedicated tool. Therefore, it is possible to perform the screw unscrewing operation and the screw unloading confirmation operation of the remote bolt in a reasonably short time.
[Brief description of the drawings]
FIG. 1 is a diagram conceptually showing an impact wrench and a remote bolt as a rotary operation tool provided with a configuration example of a remote bolt screwing release confirmation mechanism according to the present invention.
2A is a longitudinal sectional view of a wrench socket, FIG. 2B is a sectional view taken along line BB, and FIG. 2C is a longitudinal sectional view of a ball plunger.
FIG. 3 is an explanatory view of a remote bolt loosening operation.
FIG. 4 is a longitudinal sectional view of a wrench socket to which another configuration example of a friction locking mechanism is applied.
FIG. 5 is a conceptual diagram showing an example of a part exchanged by remote operation.
FIG. 6 is an enlarged cross-sectional view of a remote bolt.
FIG. 7 is an explanatory view of a dedicated screw release confirmation tool and its confirmation operation as a conventional example.
[Explanation of symbols]
10 Impact wrench (rotary operation tool)
20 Wrench socket 21 fitting recess (bolt head fitting recess)
23 Friction locking mechanism 30 Remote bolt 31 Head (bolt head)
40 ball plunger (friction locking mechanism)
42 Spring (biasing means)
43 Steel balls (locking members)

Claims (1)

被固定部材に脱落不能に設けられた遠隔ボルトを、操作腕手段に把持した回転操作工具に装着されたレンチソケットを前記遠隔ボルトのボルト頭に嵌合させて締め付け・緩め操作する遠隔ボルトの締め付け・緩め装置において、
前記レンチソケットには、付勢手段によって係止部材がそのボルト頭嵌合凹部内に向けて付勢されて成る摩擦係止機構が設けられており、該摩擦係止機構は前記ボルト頭嵌合凹部に嵌合したボルト頭に前記係止部材を押圧して前記レンチソケットに前記遠隔ボルトを支持し得るように構成されていることを特徴とする遠隔ボルトの螺合解除確認機構
Tightening and loosening the remote bolt by tightening and loosening the remote bolt that is secured to the fixed member by fitting the wrench socket mounted on the rotary operation tool gripped by the operating arm means to the bolt head of the remote bolt・ In the loosening device,
The wrench socket is provided with a friction locking mechanism in which a locking member is biased into a bolt head fitting recess by a biasing means, and the friction locking mechanism is fitted with the bolt head fitting. A remote bolt unscrewing confirmation mechanism , wherein the remote bolt is supported by the wrench socket by pressing the locking member against a bolt head fitted in the recess.
JP2001015578A 2001-01-24 2001-01-24 Remote bolt unscrewing confirmation mechanism Expired - Fee Related JP4505996B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001015578A JP4505996B2 (en) 2001-01-24 2001-01-24 Remote bolt unscrewing confirmation mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001015578A JP4505996B2 (en) 2001-01-24 2001-01-24 Remote bolt unscrewing confirmation mechanism

Publications (2)

Publication Number Publication Date
JP2002219660A JP2002219660A (en) 2002-08-06
JP4505996B2 true JP4505996B2 (en) 2010-07-21

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100387402C (en) * 2005-05-18 2008-05-14 中国科学院沈阳自动化研究所 Underwater wrench
US20140035214A1 (en) * 2012-07-31 2014-02-06 General Electric Company Self-locking fixture
CN105171406B (en) * 2015-07-23 2017-08-15 李光明 A kind of multi-functional clamp assembled for lock core
CN115816047A (en) * 2023-02-01 2023-03-21 蒙德拉贡自动化设备(昆山)有限公司 Manipulator capable of mounting and screwing nut

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010921U (en) * 1983-07-04 1985-01-25 三菱重工業株式会社 Bolt retainer
JPH07237143A (en) * 1994-02-25 1995-09-12 Gootec:Kk Bolt wrench assembling body
JPH07266156A (en) * 1994-03-31 1995-10-17 Nippon Steel Corp Bolt clamping jig and bolt unit
JPH10202442A (en) * 1997-01-22 1998-08-04 Honda Motor Co Ltd Bolt extracting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010921U (en) * 1983-07-04 1985-01-25 三菱重工業株式会社 Bolt retainer
JPH07237143A (en) * 1994-02-25 1995-09-12 Gootec:Kk Bolt wrench assembling body
JPH07266156A (en) * 1994-03-31 1995-10-17 Nippon Steel Corp Bolt clamping jig and bolt unit
JPH10202442A (en) * 1997-01-22 1998-08-04 Honda Motor Co Ltd Bolt extracting device

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