EP0164574A2 - Dispositif de vissage - Google Patents

Dispositif de vissage Download PDF

Info

Publication number
EP0164574A2
EP0164574A2 EP85105627A EP85105627A EP0164574A2 EP 0164574 A2 EP0164574 A2 EP 0164574A2 EP 85105627 A EP85105627 A EP 85105627A EP 85105627 A EP85105627 A EP 85105627A EP 0164574 A2 EP0164574 A2 EP 0164574A2
Authority
EP
European Patent Office
Prior art keywords
output shaft
screwdriver according
housing
measuring
sensor
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.)
Granted
Application number
EP85105627A
Other languages
German (de)
English (en)
Other versions
EP0164574B1 (fr
EP0164574A3 (en
Inventor
Heinz-Gerhard Dipl.-Ing. Anders
Hermann Josef Leuthner
Wolfgang Josef Alender
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.)
Deutsche Gardner Denver GmbH
Original Assignee
Gardner Denver Deutschland GmbH
Deutsche Gardner Denver GmbH
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 Gardner Denver Deutschland GmbH, Deutsche Gardner Denver GmbH filed Critical Gardner Denver Deutschland GmbH
Publication of EP0164574A2 publication Critical patent/EP0164574A2/fr
Publication of EP0164574A3 publication Critical patent/EP0164574A3/de
Application granted granted Critical
Publication of EP0164574B1 publication Critical patent/EP0164574B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1456—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers having electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers

Definitions

  • the invention relates to a screwdriver according to the preamble of claim 1.
  • Screwdrivers are known (DE-AS 24 23 300, DE-OS 31 27 753), which have angular gears as an output or downstream spur gear.
  • the sensors are used to measure the torque and / or the angle of rotation during the screwing process. As soon as the required angle of rotation or the necessary torque is reached, the measuring or. Control electronics generates a signal, usually a shutdown signal, so that the screwing process is ended.
  • the transducer and the transmitter are provided in the area of the drive shaft.
  • a torque applied to a screw can only be measured indirectly.
  • the angular gear or the spur gear is located between the screwing tool engaged with the screw and the drive shaft.
  • These transmission gears and, above all, the frictional conditions that occur and the associated gearbox efficiency affect the measuring accuracy.
  • the screws are tightened to the yield point.
  • the screwdriver must reliably reach the yield point switch off so that the screw is not stretched excessively. This requirement cannot be met with the known screwdrivers in which the sensors are arranged in the drive area or on the drive shaft.
  • the invention is based on the object of designing the generic screwdriver in such a way that the transducers for the torque and / or the angle of rotation can be arranged without enlarging the external dimensions of the screwdriver housing in such a way that the influence of the transmission and the frictional conditions during the measurement are switched off.
  • the transducer and the transformer of the screwdriver according to the invention are arranged in the output area within the screwdriver housing.
  • the transducer is therefore in the area of the driven part, so that the influence of the gearbox and the frictional conditions that occur during the measurement during the screwing process have no influence on the measuring accuracy.
  • the parts to be screwed can be tightened reliably up to the yield point without the risk that they will be overstretched.
  • the measured values are determined directly bypassing the transmission gear and transmitted to the control electronics.
  • the transmission body which the measured values determined in front of the transducer on the measuring or. Control electronics transmits, is rotatably connected to the output shaft and rotates with it. At its slip ring lies the sensor with which the measurement signals are sent to the outside of the measuring or. Control electronics are performed.
  • the transmitter is in an easily accessible location inside the gearbox.
  • the housing of a spur gear 2 is arranged on the motor part 1 in a known manner. It has a drive pinion and an output gear 3 which sits on an output shaft 3a. It is supported in the transmission housing 4 by two bearings 5 and 6 arranged at a distance from one another.
  • the driven shaft 3a is provided with a torsion part 7, which is formed by a section of the driven shaft that has a reduced diameter. Strain gauges 8 are bonded to the torsion part 7 in a known manner as signal transmitters for the torque applied to a screw as a measurement sensor.
  • the signal generated by the strain gauges 8 when a torque is applied to a screw is fed to a transmitter 10 via connecting lines 9.
  • the connecting lines 9 run through a bore 11 in the output shaft 3a to the transformer 10.
  • the bore 11 can be provided centrally or eccentrically in the output shaft 3a.
  • the transformer 10 is arranged at the upper end of the output shaft 3a and has a peg-shaped transmission body 12 which sits in the bore 11 in a rotationally fixed manner.
  • the connecting lines 9 are connected to solder lugs 13 of the transmission body 12, which is provided at its end projecting over the output shaft 3a with a number of slip rings 14 corresponding to the number of connecting lines 9.
  • sensors 15 of a brush block 16 from which the measurement signals in a multi-core cable 17 to the outside (not shown) Measuring or control electronics are performed.
  • the torsion part 7 is twisted by the reaction force of the screw.
  • the size of the torsion is a measure of the applied torque and is converted by the strain gauges 8 into corresponding signals which are transmitted by the measuring or. Control electronics are evaluated.
  • the revolutions of the output spindle are also monitored, for example, by means of a rotation angle sensor 18 arranged on the output shaft 3a.
  • the rotary angle sensor 18, which can be a field plate sensor, for example, is also glued onto the output shaft 3a.
  • the angle of rotation sensor 18 is located in the area outside the torsion part 7.
  • the output shaft 3a is surrounded by a disk-shaped magnetic core 19 fastened to the inside of the transmission housing 4, the active surface 20 of which faces the angle of rotation sensor 18 (FIG. 4) in a spiral is trained.
  • the output voltage of the rotary angle transmitter 18 changes in accordance with this distance, which enables an exact determination of the instantaneously traveled angle of rotation.
  • the electrical lines 35 which discharge the angle of rotation signal from the angle of rotation sensor 18 are likewise guided through the bore 11 of the output shaft 3a.
  • the two bearings 5, 6 are provided for guiding and mounting the output shaft 3a.
  • the bearing 5 is fixed in the axial direction. On its side facing the bearing 6, the bearing 5 lies on an inwardly projecting side Shoulder 21 of the gear housing 4.
  • the bearing 5 is axially secured by a nut 22 which is screwed into a threaded bore 23 of the gear housing 4 and with which the bearing 5 is pressed against the shoulder 21.
  • the nut 22 is designed as a cap nut, within which a further nut 24 lies, which is screwed onto a threaded axial extension 25 of the output shaft 3a and is supported on the inner ring 26 of the bearing 5.
  • the brush block 16 is attached to the nut 22.
  • a strain relief device 27 is provided for the cable 17, which is also releasably attached to the nut 22. The cable 17 is guided outwards from the gear housing 4 in a known manner.
  • the strain gauges 8 and the angle encoder 18 are arranged on the output shaft 3a. Since the corresponding screwing tool 28 (FIG. 1) is attached to the output shaft 3a, the corresponding torques and angles of rotation can be measured directly during the screwing process and transmitted to the control electronics. There is no intermediate gear between the screwing tool 28 and the strain gauges 8 and the angle encoder 18, which could impair the measuring accuracy.
  • the transmitter 10 is easily accessible, since it is accommodated on the end face of the output shaft 3a directly below a detachable cover 29 of the gear housing 4.
  • FIG. 5 shows a further embodiment of a screwdriver.
  • An angular gear 30 is provided on the straight motor part 1 'as a reduction gear.
  • a bevel gear is provided as an angular gear, of which one bevel gear 31 is shown in FIG. 6. It also sits on the output shaft 3a ', which is rotatably supported with radial bearings 32 and 33 and an axial bearing 34 in the gear housing 4'.
  • the axial bearing 34 is located in the area below the bevel gear 31, which is supported on the axial bearing.
  • the output shaft 3a ' has the reduced torsion part 7' on which the strain gauges 8 'are attached.
  • the supply lines 9 ' are led through the bore 11' in the output shaft 3a 'to the transformer 10', which is constructed in the same way as in the previously described embodiment.
  • the rotation angle sensor 18' is provided, which is surrounded by the magnetic core 19 'which is fastened to the inside of the housing 4'. Lines 35 'which carry the angle of rotation signal from the angle of rotation sensor 18' are led through the bore 11 '.
  • the transmitter 10 ' is accommodated in a recess 36 in the gear housing 4' which can be closed by the cover 29 '.
  • the brush block 16 'sits on an inwardly projecting shoulder 37 of the housing 4'.
  • the strain relief device 27 ' is fastened on the cover 29'.
  • the transmission body 12 'fastened in the bore 11' rotates together with the output shaft 3a 'and the bevel gear 31, while the brush block 16' stands still with the cable 17 '.
  • the bearings 32 to 34 are axially secured within the housing 4 '.
  • the output shaft 3a' is provided with a connecting part 38 for the respective screwing tool.
  • the measurements of the torque and the angle of rotation can in turn be carried out without interference from the angular gear, so that the parts to be screwed can be reliably brought up to the yield point, for example.
  • Fig. 7 shows an embodiment of a screwdriver in which a force transducer 39 is provided for the measurement of the torque, the measurement signals of which are passed via the connecting lines 9 ′′ in the manner described through the bore 11 ′′ of the output shaft 3a ′′.
  • the torque at the output is measured indirectly in this embodiment.
  • This embodiment is similar to the embodiment according to FIGS. 5 and 6.
  • the reduction gear is again a bevel gear, of which only the bevel gear 31 ′′ is shown.
  • the output shaft 3a ′′ is rotatably supported by two radial bearings 32 ′′, 33 ′′ and an axial bearing 34 ′′ close to the connecting piece 38 ′′ within the gear housing 4 ′′.
  • the bevel gear 31 ′′ sits on a shoulder 40 of the output shaft 3a ′′ and is axially secured by a locking ring 41 which lies between the bevel gear and a further shoulder 42 on the inside of the gear housing 4 ′′.
  • the locking ring 41 is secured by a spring washer 43 which engages in an annular groove 44 in the output shaft 3a ′′.
  • the transformer 10 ′′ is of the same design as in the embodiment according to FIG. 6.
  • axially acting force components of the peripheral force are created. These force components are related to the transmitted torque and can therefore also be used for torque measurement will.
  • the axial force component of the bevel gear 31 ′′ is transmitted to the output shaft 3 a ′′ via the shoulder 40. This in turn is supported by a further shoulder 45 on the force transducer 39, which in turn rests on the axial bearing 34 ′′.
  • the size of the axial force component and thus the transmitted torque are measured by the force transducer and transmitted via the connecting lines 9 ′′ to the transmitter 10 ′′, from which the signals of the measuring or control electronics are fed via the cable 17 ′′.
  • the measuring transducer 39 designed as a force transducer is annular and sits on the output shaft 3a ′′.
  • the torque is measured by means of strain gauges as sensors.
  • strain gauges instead of such strain gauges, piezo measuring elements can also be used.
  • Inductive transducers or permeability measurements are also possible, which are carried out on the outer surface of the output shaft which is loaded by twisting.
  • the slip rings 14, 14 ', 14' ' are provided at the points of contact with the sensors 15, 15', 15 '' with grooves, grooves or the like in order to ensure undisturbed transmission of measured values even in the event of axial shocks or small displacements of the output shaft 3a , 3a ', 3a' 'to ensure.
EP85105627A 1984-05-15 1985-05-08 Dispositif de vissage Expired - Lifetime EP0164574B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8414766U 1984-05-15
DE19848414766U DE8414766U1 (de) 1984-05-15 1984-05-15 Schrauber

Publications (3)

Publication Number Publication Date
EP0164574A2 true EP0164574A2 (fr) 1985-12-18
EP0164574A3 EP0164574A3 (en) 1987-12-16
EP0164574B1 EP0164574B1 (fr) 1991-11-27

Family

ID=6766891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105627A Expired - Lifetime EP0164574B1 (fr) 1984-05-15 1985-05-08 Dispositif de vissage

Country Status (3)

Country Link
US (1) US4648282A (fr)
EP (1) EP0164574B1 (fr)
DE (2) DE8414766U1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0422546A2 (fr) * 1989-10-10 1991-04-17 Ingersoll-Rand Company Mécanisme de contact électrique pour transducteurs ultrasoniques sur éléments de fixation
WO1996027481A1 (fr) * 1995-03-03 1996-09-12 Robert Bosch Gmbh Emetteur de signaux, notamment a destination d'une unite commande par ultrasons pour le reserrage de raccords a vis
WO2008087007A1 (fr) 2007-01-19 2008-07-24 Atlas Copco Blm S.R.L. Dispositif servant à détecter le couple et l'angle de rotation d'un arbre de rotation
ITMI20110286A1 (it) * 2011-02-25 2012-08-26 Scs Concept Italia S R L Chiave idraulica
WO2018146092A1 (fr) * 2017-02-07 2018-08-16 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Procédé et dispositif d'actionnement d'un appareil de serrage expansible hydraulique
EP3388199A1 (fr) * 2017-04-13 2018-10-17 Johannes Lübbering GmbH Dispositif à vis et système à vis à main
WO2019206609A1 (fr) * 2018-04-26 2019-10-31 Atlas Copco Industrial Technique Ab Outil électrique pour le serrage de joints à vis

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8530993D0 (en) * 1985-12-17 1986-01-29 Crane Electronics Torque transducers
DE3714150A1 (de) * 1987-04-28 1988-11-17 Stabil Elektronik Gmbh Vorrichtung zum messen der lastabhaengigen torsion einer rotierenden welle
JP2511094B2 (ja) * 1988-02-04 1996-06-26 株式会社日立製作所 回転角制御によるねじ締付け装置
US5115701A (en) * 1990-09-26 1992-05-26 Gse, Inc. Drive mechanism and strain gauge mounting for a nutrunner appliance
JPH04109867U (ja) * 1991-03-07 1992-09-24 瓜生製作株式会社 トルク制御式インパクトレンチ
SE501155C2 (sv) * 1993-04-21 1994-11-28 Atlas Copco Tools Ab Impulsmutterdragare
DE4429282A1 (de) * 1994-08-18 1996-02-22 Cooper Ind Inc Hydro-Impulsschrauber insbesondere zum Anziehen von Schraubverbindungen
DE29607207U1 (de) * 1996-04-20 1997-08-21 Wagner Paul Heinz Hydraulischer Kraftschrauber
SE509494C2 (sv) * 1996-11-19 1999-02-01 Atlas Copco Tools Ab Kraftmutterdragare med momentgivare
AU2002230048A1 (en) * 2001-01-29 2002-08-12 Pat Technologies Limited Method and apparatus for determining when a fastener is tightened to a predetermined tightness by an impact tightening tool
GB2414950B (en) * 2004-06-12 2006-06-21 Mobiletron Electronics Co Ltd Elbow-type power hand tool
US7552781B2 (en) 2004-10-20 2009-06-30 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
FR2894172B1 (fr) * 2005-12-01 2008-02-08 Georges Renault Soc Par Action Outillage de vissage a tete d'angle, incluant un capteur de couple monte sur l'arbre de sortie, et module de transmission correspondant.
US9266178B2 (en) 2010-01-07 2016-02-23 Black & Decker Inc. Power tool having rotary input control
AU2011204260A1 (en) * 2010-01-07 2012-06-07 Black & Decker Inc. Power screwdriver having rotary input control
US8418778B2 (en) 2010-01-07 2013-04-16 Black & Decker Inc. Power screwdriver having rotary input control
US9475180B2 (en) 2010-01-07 2016-10-25 Black & Decker Inc. Power tool having rotary input control
EP2631035B1 (fr) 2012-02-24 2019-10-16 Black & Decker Inc. Outil électrique
US9802299B2 (en) * 2015-03-24 2017-10-31 Soartec Industrial Corp. Torsion-detecting pneumatic impact tool
US10589413B2 (en) 2016-06-20 2020-03-17 Black & Decker Inc. Power tool with anti-kickback control system
DE102018124402A1 (de) * 2018-10-02 2020-04-02 DSM Meßtechnik GmbH Elektronisches Schraubwerkzeug

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474503A (en) * 1966-06-27 1969-10-28 Joseph W Less Articles of neckwear
DE2020503A1 (de) * 1969-07-02 1971-01-14 Gardner Denver Co Drehmoment-Begrenzer fuer Werkzeuge
US3572447A (en) * 1968-11-12 1971-03-30 Ingersoll Rand Co Torque measuring system for impact wrench
FR2179290A5 (fr) * 1972-04-05 1973-11-16 Maco Meudon Sa
US3813933A (en) * 1972-02-02 1974-06-04 Sweeney Mfg Co Dynamic torque indicators
US4084429A (en) * 1976-05-03 1978-04-18 Foster Cathead Corporation Power tong apparatus
DE2721940A1 (de) * 1977-05-14 1978-11-23 Gkn Fasteners Ltd Verfahren und vorrichtung zum festziehen einer mutter-gewindebolzen- verbindung
GB1581101A (en) * 1978-04-15 1980-12-10 Gkn Fasteners Ltd Wrench apparatus for tightening a nut and bolt assembly
JPS5740624A (en) * 1980-08-25 1982-03-06 Honda Motor Co Ltd Clamping torque detector for powered wrench
DE3216773A1 (de) * 1982-05-05 1983-11-10 Dr. Staiger, Mohilo + Co GmbH, 7060 Schorndorf Vorrichtung zum anziehen eines ein gewinde tragenden verbindungselements mit begrenzung des endanzugsdrehmoments

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
US4104778A (en) * 1977-01-27 1978-08-08 Ingersoll-Rand Company Method and apparatus for fastener tensioning
US4162639A (en) * 1977-05-11 1979-07-31 G.K.N. Fasteners Limited Load indicating nut wrench
US4544039A (en) * 1983-04-01 1985-10-01 Crane Electronics, Limited Torque transducing systems for impact tools and impact tools incorporating such systems

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3474503A (en) * 1966-06-27 1969-10-28 Joseph W Less Articles of neckwear
US3572447A (en) * 1968-11-12 1971-03-30 Ingersoll Rand Co Torque measuring system for impact wrench
DE2020503A1 (de) * 1969-07-02 1971-01-14 Gardner Denver Co Drehmoment-Begrenzer fuer Werkzeuge
US3813933A (en) * 1972-02-02 1974-06-04 Sweeney Mfg Co Dynamic torque indicators
FR2179290A5 (fr) * 1972-04-05 1973-11-16 Maco Meudon Sa
US4084429A (en) * 1976-05-03 1978-04-18 Foster Cathead Corporation Power tong apparatus
DE2721940A1 (de) * 1977-05-14 1978-11-23 Gkn Fasteners Ltd Verfahren und vorrichtung zum festziehen einer mutter-gewindebolzen- verbindung
GB1581101A (en) * 1978-04-15 1980-12-10 Gkn Fasteners Ltd Wrench apparatus for tightening a nut and bolt assembly
JPS5740624A (en) * 1980-08-25 1982-03-06 Honda Motor Co Ltd Clamping torque detector for powered wrench
DE3216773A1 (de) * 1982-05-05 1983-11-10 Dr. Staiger, Mohilo + Co GmbH, 7060 Schorndorf Vorrichtung zum anziehen eines ein gewinde tragenden verbindungselements mit begrenzung des endanzugsdrehmoments

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Title
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 108 (P-123)[986], 18. Juni 1982; & JP-A-57 40 624 (HONDA GIKEN KOGYO K.K.) 06-03-1982 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0422546A2 (fr) * 1989-10-10 1991-04-17 Ingersoll-Rand Company Mécanisme de contact électrique pour transducteurs ultrasoniques sur éléments de fixation
EP0422546A3 (en) * 1989-10-10 1992-07-01 Sps Technologies, Inc. Electrical contact mechanism for ultrasonic transducers on fasteners
WO1996027481A1 (fr) * 1995-03-03 1996-09-12 Robert Bosch Gmbh Emetteur de signaux, notamment a destination d'une unite commande par ultrasons pour le reserrage de raccords a vis
WO2008087007A1 (fr) 2007-01-19 2008-07-24 Atlas Copco Blm S.R.L. Dispositif servant à détecter le couple et l'angle de rotation d'un arbre de rotation
US8040130B2 (en) 2007-01-19 2011-10-18 Atlas Copco Blm S.R.L Device for detecting the torque and the angle of rotation of a rotating shaft
ITMI20110286A1 (it) * 2011-02-25 2012-08-26 Scs Concept Italia S R L Chiave idraulica
WO2012114361A1 (fr) * 2011-02-25 2012-08-30 Scs Concept Italia S.R.L. Clé hydraulique
WO2018146092A1 (fr) * 2017-02-07 2018-08-16 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Procédé et dispositif d'actionnement d'un appareil de serrage expansible hydraulique
EP3388199A1 (fr) * 2017-04-13 2018-10-17 Johannes Lübbering GmbH Dispositif à vis et système à vis à main
WO2018188829A1 (fr) * 2017-04-13 2018-10-18 Johannes Lübbering Gmbh Dispositif de vissage et système de vissage portatif
CN110446586A (zh) * 2017-04-13 2019-11-12 约翰尼斯卢布林有限责任公司 旋拧设备以及手持式旋拧系统
RU2743181C1 (ru) * 2017-04-13 2021-02-15 Йоханнес Любберинг Гмбх Винтовое устройство, а также ручная винтовая система
CN110446586B (zh) * 2017-04-13 2021-09-07 约翰尼斯卢布林有限责任公司 旋拧设备以及手持式旋拧系统
US11400567B2 (en) 2017-04-13 2022-08-02 Johannes Lübbering Gmbh Screw device and hand-held screw system
AU2018251664B2 (en) * 2017-04-13 2023-01-12 Johannes Lübbering Gmbh Screw device and hand-held screw system
WO2019206609A1 (fr) * 2018-04-26 2019-10-31 Atlas Copco Industrial Technique Ab Outil électrique pour le serrage de joints à vis
CN112020408A (zh) * 2018-04-26 2020-12-01 阿特拉斯·科普柯工业技术公司 用于拧紧螺纹接头的电动工具
US11292111B2 (en) 2018-04-26 2022-04-05 Atlas Copco Industrial Technique Ab Electric power tool for tightening screw joints
CN112020408B (zh) * 2018-04-26 2022-04-05 阿特拉斯·科普柯工业技术公司 用于拧紧螺纹接头的电动工具

Also Published As

Publication number Publication date
US4648282A (en) 1987-03-10
DE8414766U1 (de) 1984-09-13
EP0164574B1 (fr) 1991-11-27
DE3584736D1 (de) 1992-01-09
EP0164574A3 (en) 1987-12-16

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