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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