JP2768636B2 - Reaction force receiving structure of screw tightening machine - Google Patents
Reaction force receiving structure of screw tightening machineInfo
- Publication number
- JP2768636B2 JP2768636B2 JP6128961A JP12896194A JP2768636B2 JP 2768636 B2 JP2768636 B2 JP 2768636B2 JP 6128961 A JP6128961 A JP 6128961A JP 12896194 A JP12896194 A JP 12896194A JP 2768636 B2 JP2768636 B2 JP 2768636B2
- Authority
- JP
- Japan
- Prior art keywords
- reaction force
- force receiving
- clip
- socket
- receiving cylinder
- 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
Links
Landscapes
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、例えば建設機械のキャ
タピラ、電車の台車等に螺着する大型ねじを、油圧、空
圧、電力等の動力源を用いてねじ締機により締着すると
きに生じる反力を受けさせるための反力受け構体に関す
るものである。BACKGROUND OF THE INVENTION The present invention relates to a case where a large screw to be screwed to a caterpillar of a construction machine, a truck of a train or the like is fastened by a screwing machine using a power source such as hydraulic, pneumatic or electric power. The present invention relates to a reaction force receiving structure for receiving a reaction force generated in the reaction.
【0002】[0002]
【従来の技術】例えばねじ径が数ミリ以下であるボル
ト、ナット等の小型ねじを、油圧、空圧、電力等の動力
源で動作する動力式ねじ締機を用いてねじ締めを行なう
とき、そのねじ締め完了直前時に生じる反力は、その締
付作業者によって受け止めることができる程度の強さで
あることから、適正なねじ締結力でねじ締めを行なうこ
とができるが、ねじ締めを行なうねじが大型のボルト、
ナット等のねじである場合は、それら大型ねじを締結す
るために使用される動力式ねじ締機も大型のものとな
り、その大型ねじ締機を用いるねじ締結時に生じる反力
も強大なものであって、その反力を作業者自身で受け止
めることは不可能となる場合が多い。2. Description of the Related Art For example, when a small screw such as a bolt or a nut having a screw diameter of several millimeters or less is tightened using a power type screw driving machine operated by a power source such as hydraulic, pneumatic or electric power, The reaction force generated immediately before the completion of the screw tightening is strong enough to be received by the tightening operator, so that the screw can be tightened with an appropriate screw tightening force. Is a large bolt,
In the case of screws such as nuts, the power type screw tightening machine used for fastening these large screws also becomes large, and the reaction force generated when fastening the screws using the large screw tightening machine is also strong. In many cases, it is impossible for the worker to receive the reaction force by himself.
【0003】このようなことから、特に大型ねじを締結
するに使用される大型の動力式ねじ締機にあっては、そ
のねじ締結時直前に生じる反力を、被締結体の固定部で
受け止めるための反力受けアームを具備せしめたねじ締
機が知られている。[0003] In view of the above, in a large-sized power screwdriver particularly used for fastening a large screw, a reaction force generated immediately before the screw is fastened is received by a fixing portion of the object to be fastened. Screwing machine provided with a reaction force receiving arm for the purpose.
【0004】この大型の動力式ねじ締機に用いられてい
る反力受け構体の公知例としては、例えば図1に示す如
き構造のものがある。A well-known example of a reaction force receiving structure used in such a large power type screwdriver is, for example, a structure as shown in FIG.
【0005】すなわち、1は動力式ねじ締機、2はその
動力式ねじ締機から支出されている駆動軸であって、こ
の駆動軸2の先端にソケット3がピン4によって、係合
されている。5は駆動軸2を挿通するか、動力式ねじ締
機のハウジングとは一体で回転不能に構成されている固
定フランジであって、この固定フランジ5には、前記ソ
ケット3に被さるように形成される反力受け筒6が取付
ねじ7により固定されている。さらにこの反力受け筒6
の外側には、被ねじ締付体8等の固定体に係止されて、
その反力受け筒6の回動を阻止せしめるための反力受け
アーム9が固定されているものである。なお10はソケ
ット3に係合されかつ被締付体8にねじ込まれるボルト
(ねじ)を示す。[0005] That is, 1 is a power screwdriver, 2 is a drive shaft expended from the power screwdriver, and a socket 3 is engaged with a tip of the drive shaft 2 by a pin 4. I have. Reference numeral 5 denotes a fixed flange which is inserted into the drive shaft 2 or is integrally formed with the housing of the power screwdriver so as not to rotate. The fixed flange 5 is formed so as to cover the socket 3. The reaction force receiving cylinder 6 is fixed by mounting screws 7. Furthermore, this reaction force receiving cylinder 6
Outside, is locked to a fixed body such as a threaded body 8,
A reaction force receiving arm 9 for preventing the rotation of the reaction force receiving cylinder 6 is fixed. Reference numeral 10 denotes a bolt (screw) engaged with the socket 3 and screwed into the tightened body 8.
【0006】従って動力式ねじ締機1により、ボルト1
0を被締付体8に螺着させるとき、その螺着直前におい
て生じるねじ締め反力は、被締付体8に係止される反力
受けアーム9及び反力受け筒6の作用で受け止められ、
これによって動力式ねじ締機1が反動されることがなく
正規の締付け力でしかも安全に大型ねじを締結すること
ができるものである。Accordingly, the power type screw tightening machine 1 allows the bolt 1
When the screw 0 is screwed to the tightened body 8, the screw tightening reaction force generated immediately before the screwing is received by the action of the reaction force receiving arm 9 and the reaction force receiving cylinder 6 locked to the tightened body 8. And
As a result, the power screwdriver 1 is not rebounded, and a large screw can be securely fastened with a regular tightening force.
【0007】[0007]
【発明が解決しようとする課題】ところが、その従来例
において、反力受けアーム9を有する反力受け筒6を動
力式ねじ締機1に取付けるための取付手段は取付ねじ7
によるねじ締めによって行なっているために、例えばこ
の取付ねじ7の締付力が不足したり緩んだりすると、そ
の反力受け筒6がねじ締機から脱落しやすいという不具
合が生じる。However, in the conventional example, the mounting means for mounting the reaction force receiving cylinder 6 having the reaction force receiving arm 9 to the power screwdriver 1 is an attachment screw 7.
For example, if the tightening force of the mounting screw 7 is insufficient or loose, the reaction force receiving cylinder 6 tends to fall off from the screw tightening machine.
【0008】また取付ねじ7により固定されている反力
受け筒6は、ソケット3の外周を覆うように位置されて
いて、そのソケットを目視することができないために、
ソケット3をボルト10に係合させようとするとき、そ
のソケット3とボルト10との係合位置又は係合状態を
確認することができず、さらには、ソケット3の駆動状
態(回転状態)を確認することもできないという不具合
もあった。Further, the reaction force receiving cylinder 6 fixed by the mounting screw 7 is located so as to cover the outer periphery of the socket 3, and the socket cannot be visually recognized.
When the socket 3 is to be engaged with the bolt 10, the engagement position or the engagement state between the socket 3 and the bolt 10 cannot be confirmed, and furthermore, the driving state (rotation state) of the socket 3 is changed. There was also a problem that it could not be confirmed.
【0009】[0009]
【課題を解決するための手段】本発明は、かかる従来の
不具合に着目してなされたもので、反力受けアームを具
備する反力受け筒とねじ締機との係止保持を確実ならし
める構造となすと共に、その反力受け筒には、その反力
受け筒の内部に位置されるソケットの回動状況及びその
ソケットと被締付ねじとの係合状況等を確認できる窓孔
又は/及び切欠き部を設けて、動力式ねじ締機によるね
じ締め作業状況を容易に把握し、締付け作業効率を高め
ることができるねじ締機の反力受け構体を提供すること
にある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and secures the retaining of a reaction force receiving cylinder having a reaction force receiving arm and a screw tightening machine. In addition to the above structure, the reaction force receiving cylinder has a window hole or / and / or the like for confirming a turning state of a socket located inside the reaction force receiving cylinder and an engagement state between the socket and a screw to be tightened. Another object of the present invention is to provide a reaction force receiving structure for a screw tightening machine which is provided with a notch portion to easily grasp a screw tightening operation state by a power screw tightening machine and to increase a tightening operation efficiency.
【0010】[0010]
【実施例】以下に本発明を図面に示す実施例に基いて詳
細に説明するが、本実施例の構造と、従来例で説明した
構造との同一部分は、従来例で説明した符号を付してそ
の同一構造部分の構造説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. The same parts as those of the structure of the present embodiment and those of the conventional example are denoted by the same reference numerals as those of the conventional example. The description of the structure of the same structure is omitted.
【0011】実施例1 図2乃至図4において、本実施例は、動力式ねじ締機1
の固定フランジ5に被着係止される反力受け筒11の構
造及びその反力受け筒11を固定フランジ5に係止せし
める係止構造について特長を有する。Embodiment 1 In FIG. 2 to FIG. 4, this embodiment is a power type screw tightening machine 1.
There is a feature in the structure of the reaction force receiving cylinder 11 to be attached and locked to the fixing flange 5 and the locking structure for locking the reaction force receiving cylinder 11 to the fixing flange 5.
【0012】すなわち、本実施例の反力受け筒11の軸
方向中程には窓孔12を設けたものであり、また動力式
ねじ締機1に設けられている六角形固定フランジ5の周
囲には、クリップ13を係合せしめるための半円形状の
係止溝14が形成されているものである。クリップ13
は、環状に形成されると共にその両端がクロスして外方
へ突き出されるつまみ部13Aに形成されている。 That is, a window hole 12 is provided in the axial direction of the reaction force receiving cylinder 11 according to the present embodiment, and a hexagonal fixing flange 5 provided in the power screwdriver 1 is provided. Is formed with a semicircular locking groove 14 for engaging the clip 13. Clip 13
Is that is formed in the knob portion 13A that is at both ends is formed into an annular protruding outward cross.
【0013】そして上記固定フランジ5に反力受け筒1
1を嵌着せしめるには、その固定フランジ5に、反力受
け筒11の上部を嵌合せしめた後、クリップ13のつま
み部13Aを、手で摘みながら窓孔12より反力受け筒
11内に挿入し、さらにそのクリップを駆動軸2の下端
部をくぐらせて、前記の係止溝14内へクリップ13の
輪部を係合させ、しかる後、そのクリップ13の自由端
部の摘み力を解放すれば、クリップ13の弾性復元力
で、そのクリップ輪部が係止溝14内に嵌入されると共
に反力受け筒11に形成されている係止段部15に係止
され、このクリップを介して反力受け筒11が固定フラ
ンジ5からの離脱が阻止されるものである。The reaction flange 1 is mounted on the fixed flange 5.
To allowed to fitting 1 has, on its fixing flange 5, after put in engagement with the upper portion of the reaction force receiving cylinder 11, knob clips 13
The pin 13A is inserted into the reaction force receiving cylinder 11 through the window hole 12 while being pinched by hand, and the clip is passed through the lower end of the drive shaft 2 so that the loop of the clip 13 is inserted into the locking groove 14. When the gripping force of the free end portion of the clip 13 is released, the clip ring portion is fitted into the locking groove 14 by the elastic restoring force of the clip 13 and the reaction force receiving portion is engaged. It is locked by a locking step 15 formed on the cylinder 11, and the reaction force receiving cylinder 11 is prevented from being detached from the fixed flange 5 via this clip.
【0014】次いで駆動軸2にソケット3を嵌合せしめ
た後、上記窓孔12を利用して、駆動軸2にソケット3
を固定するためのピン4を、そのソケット3及び駆動軸
2に打ち込めば駆動軸2とソケット3との結合がなされ
る。Next, after the socket 3 is fitted to the drive shaft 2, the socket 3 is
When the pin 4 for fixing the shaft is driven into the socket 3 and the drive shaft 2, the drive shaft 2 and the socket 3 are connected.
【0015】このように本実施例にあっては、その第1
番目の特長として、動力式ねじ締機1の固定フランジ5
へ反力受け筒11を固定するための手段として、その固
定フランジ5の周囲に係止溝14を設け、この係止溝1
4より突き出る太さの線材で形成したクリップ13をそ
の係止溝14に嵌入することで、そのクリップ13の突
出周縁部を、固定フランジ5に嵌合した反力受け筒11
の係止段部に係止させて反力受け筒11の固定フランジ
5からの離脱を防ぐものである。As described above, in the present embodiment, the first
The second feature is that the fixed flange 5 of the power screwdriver 1 is
As means for fixing the counterforce receiving cylinder 11, a locking groove 14 is provided around the fixing flange 5.
By inserting a clip 13 formed of a wire rod having a thickness protruding from the engaging groove 14 into the engaging groove 14, the projecting peripheral edge of the clip 13 is fitted to the reaction force receiving cylinder 11 fitted to the fixing flange 5.
In order to prevent the reaction force receiving cylinder 11 from being detached from the fixed flange 5.
【0016】従ってそのクリップ13と反力受け筒11
との係合作用で、その反力受け筒11が固定フランジ5
から離脱されることがなく、固定フランジ5と反力受け
筒11との結合(固定)が安全維持されるという特長が
ある。第2番目の特徴としてクリップ13の両端部には
つまみ部13Aを形成して、このつまみ部13Aをつま
んで、クリップ13と係止溝14との係脱操作を行ない
得るようにしたので、他の工具等を使用することなく反
力受け筒11とフランジ5との係脱をきわめて容易に行
なうことができる。 Therefore, the clip 13 and the reaction force receiving cylinder 11
The reaction force receiving cylinder 11 is fixed to the fixed flange 5
There is a feature that the connection (fixation) between the fixing flange 5 and the reaction force receiving cylinder 11 is maintained safely without being detached from the fixing flange 5. The second feature is that both ends of the clip 13
A knob 13A is formed, and the knob 13A is
Then, the clip 13 and the locking groove 14 are engaged and disengaged.
So that it can be used without using other tools, etc.
Very easily engages and disengages the force receiving cylinder 11 and the flange 5.
Can be.
【0017】第3番目の特長として、反力受け筒11の
側面に窓孔12を設けたことである。従ってこの窓孔1
2を設けたことにより、この窓孔12を利用して、クリ
ップ13を係止溝14内へ嵌入せしめる作業及び駆動軸
2にソケット3を結合するためのピン4の打ち込み作業
等がその反力受け筒11の外部より容易に行なえ、ソケ
ット3の取付け作用が向上する。[0017] As a third feature is the provision of the window hole 12 to the side of the reaction force receiving cylinder 11. Therefore, this window hole 1
By using the window hole 12, the operation of fitting the clip 13 into the locking groove 14 and the operation of driving the pin 4 for coupling the socket 3 to the drive shaft 2 using the window hole 12 are the reaction forces. It can be easily carried out from the outside of the receiving cylinder 11, and the action of attaching the socket 3 is improved.
【0018】第4番目の特徴として、その窓孔12を透
してソケット3及びソケット3と被締付ボルト10の嵌
合部を、目視することができるので、ソケット駆動状況
の確認及びソケットと被締付ボルトとの嵌合作業の円滑
性が高められる。[0018] As a fourth aspect, the fitting portion of the socket 3 and the socket 3 and be fastened bolts 10 it through the window hole 12, it is possible to visually and confirmed and socket of the driving situation The smoothness of the fitting operation with the tightened bolt is improved.
【0019】実施例2 図5において、本実施例は反力受け筒11の側面に、実
施例1で示した窓孔12と、反力受け筒11の下側開口
部に、その反力受け筒11の側面一部を切欠きする切欠
き部16の双方を備えたものである。従ってこの実施例
によれば窓孔12を用いてクリップ13の係止溝14内
への止着(嵌入)作業及びピン4の打込み作業と、ソケ
ット3の駆動状況の把握がきわめて容易であり、さら
に、切欠き部16を透してソケット3と被締付ボルト1
0との嵌合状態及びソケットの駆動状況等を容易に確認
することができ、これらによって上記実施例同様にねじ
締め作業の効率向上が図られる。 Embodiment 2 In FIG. 5 , the present embodiment shows that a reaction force
The window hole 12 shown in the first embodiment and the lower opening of the reaction force receiving cylinder 11
Notch to cut out part of the side surface of the reaction force receiving cylinder 11
And the both parts 16 are provided. Therefore this embodiment
According to the above, the inside of the locking groove 14 of the clip 13 is
Fastening (fitting) work and driving work of pin 4
It is extremely easy to grasp the driving status of
And the socket 3 and the bolt 1 to be tightened through the notch 16.
Easily check the fitting state with 0 and the driving state of the socket
These allow the screws to be
The efficiency of the fastening operation is improved.
【0020】[0020]
【発明の効果】以上のように、この発明のねじ締機の反
力受け構体によれば、上記窓孔12を利用して、反力受
け筒11の内部で、該反力受け筒11と、固定フランジ
5とを着脱可能に係止せしめるためのクリップ13を、
上記固定フランジ5に形成されている半円係止溝14内
へ嵌合させる作業又それとは反対に半円係止溝14から
外す作業を容易に行なうことができる。つまり反力受け
筒11の内側と固定フランジ5との係脱作業をクリップ
13による係脱できわめて容易に行なうことができるの
で反力受け筒11を、使用状況に応じて選択的に交換使
用することが容易となる。 また上記クリップ13はその
両端に形成されているつまみ部13Aを手動作で操作し
てクリップ13の係脱を行なうことができるので特別な
工具を使用することなく、クリップ13の係脱作業を手
動作できわめて容易に行なうことができる。 また上記窓
孔12を透してクリップ13による半円係止溝14と反
力受け筒11との係止状況を反力受け筒11の外部から
容易に確認することができる。 また反力受け筒11に
は、切欠き部16が形成されていることからこの切欠き
部16を透して、被締付ボルト10とソケット3との係
合状態を目視確認することが容易となり、ソケット3に
よる被締付ボルト締結作業の確認が可能であってねじ締
結作業の作業効率も向上されるという作用効果を奏する
ものである。 As described above, the countermeasure of the screw tightening machine of the present invention is as follows.
According to the force receiving structure, the reaction force receiving using the window hole 12 is performed.
The reaction force receiving cylinder 11 and a fixing flange
A clip 13 for detachably locking the clip 5 with the clip 13;
Inside the semicircular locking groove 14 formed in the fixed flange 5
Work from the semicircular locking groove 14
Removal work can be performed easily. In other words, the reaction force
Clips the engagement and disengagement work between the inside of the cylinder 11 and the fixed flange 5
13 can be done very easily
To selectively exchange the reaction force receiving cylinder 11 according to the usage.
It becomes easy to use. The clip 13 is
The knobs 13A formed at both ends are manually operated.
Specially because the clip 13 can be disengaged
Disengage the clip 13 by hand without using tools.
Operation can be performed very easily. Also the above window
Through the hole 12 and the semicircular locking groove 14 formed by the clip 13
The state of engagement with the force receiving cylinder 11 can be determined from the outside of the reaction force receiving cylinder 11.
It can be easily confirmed. In addition, the reaction force receiving cylinder 11
This notch is formed by the notch 16
Through the portion 16, the connection between the bolt 10 and the socket 3
It is easy to visually check the matching state, and the socket 3
It is possible to confirm the tightening work of the bolts
This has the effect of improving the work efficiency of the knotting work.
Things.
【図1】従来のねじ締機反力受け構体の構造説明図。FIG. 1 is a structural explanatory view of a conventional screw fastener reaction force receiving structure.
【図2】本発明実施例のねじ締機反力受け構体を示す断
面構造説明図。FIG. 2 is a cross-sectional structural explanatory view showing a screwdriver reaction force receiving structure according to the embodiment of the present invention.
【図3】本発明実施例のねじ締機反力受け構体を示す外
側面図。FIG. 3 is an outer side view showing the screw fastener reaction force receiving structure according to the embodiment of the present invention.
【図4】本発明実施例のねじ締機反力受け構体を示す平
断面図。FIG. 4 is a plan cross-sectional view showing a screw fastener reaction force receiving structure according to the embodiment of the present invention.
【図5】本発明第2実施例を示す断面構造説明図。FIG. 5 is a sectional structural explanatory view showing a second embodiment of the present invention.
1…動力式ねじ締機 2…駆動軸 3…ソケット 4…ピン 5…固定フランジ 7…取付ねじ 8…被ねじ締付体 9…反力受けアーム 10…被締付ボルト 11…反力受け筒 12…窓孔 13…クリップ13A…つまみ部 14…係止溝 15…係止段部 16…切欠き部DESCRIPTION OF SYMBOLS 1 ... Power type screw tightening machine 2 ... Drive shaft 3 ... Socket 4 ... Pin 5 ... Fixed flange 7 ... Mounting screw 8 ... Threaded body 9 ... Reaction force receiving arm 10 ... Tightened bolt 11 ... Reaction force receiving cylinder DESCRIPTION OF SYMBOLS 12 ... Window hole 13 ... Clip 13A ... Knob part 14 ... Locking groove 15 ... Locking step part 16 ... Notch part
Claims (2)
能に支持する固定フランジ(5)の外側面と、上記駆動
軸に取付けられているソケット(3)の外側面を覆う反
力受け筒(11)を有する反力受け構体において、上記
固定フランジ(5)の外周面には、つまみ部(13A)
を有するリング状のクリップ(13)が係合される半円
状の係止溝(14)を形成し、また上記反力受け筒(1
1)には、上記係止溝(14)内に係合されているクリ
ップ(13)の周縁と係合される係止段部(15)、及
びクリップ(13)と半円係止溝との係脱操作を、反力
受け筒(11)の外側から、そのクリップ(13)両端
のつまみ部(13A)をつまんで行なうためと、上記駆
動軸(2)に、ソケット(3)を取付けるためのピン
(4)の打込みのために用いる窓孔(12)を設けたこ
とを特徴とするねじ締機の反力受け構体。An outer surface of a fixed flange (5) rotatably supporting a drive shaft (2) of a power screwdriver and an outer surface of a socket (3) mounted on the drive shaft. In the reaction force receiving structure having the force receiving cylinder (11), a knob (13A) is provided on the outer peripheral surface of the fixed flange (5).
A semicircular locking groove (14) with which a ring-shaped clip (13) having an engagement is formed, and the reaction force receiving cylinder ( 1 ) is formed.
1 ) The locking step (15) engaged with the periphery of the clip (13) engaged in the locking groove (14), and the clip (13) and the semicircular locking groove Of the clip (13) from the outside of the reaction receiving cylinder (11).
And to perform by pinching the knob portion (13A), to the drive <br/> shaft (2), have use for driving the pin (4) for mounting the socket (3) Rumadoana (12 the reaction force receiving structure of the screw tightening machine, characterized in that the provided).
に、ソケット被締付ボルト(10)との嵌合を反力受け
筒(11)の外部から確認するための切欠き部(16)
を設けたことを特徴とするねじ締機の反力受け構体。 2. A reaction force receiving cylinder (11) according to claim 1.
Receives the reaction force with the fitting with the socket tightened bolt (10).
Notch (16) for checking from outside of tube (11)
A reaction force receiving structure for a screw tightening machine, comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6128961A JP2768636B2 (en) | 1994-06-10 | 1994-06-10 | Reaction force receiving structure of screw tightening machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6128961A JP2768636B2 (en) | 1994-06-10 | 1994-06-10 | Reaction force receiving structure of screw tightening machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07328941A JPH07328941A (en) | 1995-12-19 |
JP2768636B2 true JP2768636B2 (en) | 1998-06-25 |
Family
ID=14997700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6128961A Expired - Fee Related JP2768636B2 (en) | 1994-06-10 | 1994-06-10 | Reaction force receiving structure of screw tightening machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2768636B2 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5298279A (en) * | 1976-02-13 | 1977-08-17 | Masahide Ichikawa | Dust preventive device for hand drills |
JPS5444320U (en) * | 1977-08-29 | 1979-03-27 | ||
JPS60255368A (en) * | 1984-05-30 | 1985-12-17 | 日立エレベ−タサ−ビス株式会社 | Fixed-torque electric nut runner |
-
1994
- 1994-06-10 JP JP6128961A patent/JP2768636B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07328941A (en) | 1995-12-19 |
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