EP0172120A1 - Elektronischer Drehmomentschlüssel - Google Patents

Elektronischer Drehmomentschlüssel Download PDF

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Publication number
EP0172120A1
EP0172120A1 EP85420137A EP85420137A EP0172120A1 EP 0172120 A1 EP0172120 A1 EP 0172120A1 EP 85420137 A EP85420137 A EP 85420137A EP 85420137 A EP85420137 A EP 85420137A EP 0172120 A1 EP0172120 A1 EP 0172120A1
Authority
EP
European Patent Office
Prior art keywords
torque
value
limit value
tightening torque
actual
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
EP85420137A
Other languages
English (en)
French (fr)
Other versions
EP0172120B1 (de
Inventor
Georges Heyraud
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.)
SAM Outillage SAS
Original Assignee
Forges Stephanoises SA
SAM Outillage SAS
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 Forges Stephanoises SA, SAM Outillage SAS filed Critical Forges Stephanoises SA
Priority to AT85420137T priority Critical patent/ATE31262T1/de
Publication of EP0172120A1 publication Critical patent/EP0172120A1/de
Application granted granted Critical
Publication of EP0172120B1 publication Critical patent/EP0172120B1/de
Expired 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
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1425—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by electrical means

Definitions

  • the present invention relates to an electronic torque wrench.
  • This key comprises, in known manner, a drive head which cooperates with the element to be tightened and which is linked to an elongated body serving as a handle as well as housing for the electrical part, the latter comprising: a measuring bridge with strain gauges for determining the applied tightening torque, means for supplying power to the measuring bridge and the rest of the circuits, display means capable of indicating the value of the tightening torque, means for comparing the torque tightening torque measured with a prescribed limit value, and signaling means which are triggered when the applied and measured tightening torque reaches or exceeds the prescribed limit value.
  • a torque wrench of this kind constitutes an autonomous portable tool making it possible to tighten a bolt with an exactly defined torque.
  • Other similar embodiments include an analog-digital converter and display means of the digital type, for example with light-emitting diodes, allowing a direct reading of the value of the tightening torque applied - see French patents n ° 2 296 835 and No. 2,400,996.
  • the present invention aims to improve this kind of torque wrench, especially in terms of convenience of use, and also from the point of view of reducing energy consumption.
  • these are the same display means, of the digital type, which are used alternately to indicate the value of the actual tightening torque applied by means of the key, and to select and indicate the desired limit value of this tightening torque.
  • the display means which in any case make it possible to read the value of the actual tightening torque applied using the key to the element such as a bolt, are thus also used in the invention to "program" the desired tightening torque, before using the wrench. This preliminary operation can therefore be carried out in a simple, rapid and precise manner.
  • means are provided for automatically switching the display means, with passage from the indication of the limit value of the tightening torque to the indication of its actual measured value, when the latter value exceeds a predetermined threshold.
  • the reverse passage from the indication of this actual value to the indication of the chosen limit value is preferably not not instantaneous when the tightening torque disappears.
  • the torque wrench comprises means for memorizing the maximum tightening torque reached, allowing the display means to still indicate the value of this torque for a certain period after the end of tightening. . the display means again indicating the prescribed limit value after this period. In this way, a very brief interruption of the lock does not cause the return to the display of the torque limit value.
  • the comparison means are arranged so as to compare on the one hand the tightening torque applied and measured with a predetermined fraction of the prescribed limit value, and on the other hand to compare the torque of rage applied and measured with this limit value itself, the signaling means emitting a first perceptible signal when the applied and measured clamping current reaches said predetermined fraction, e emitting a second perceptible signal distinct from the first when the tightening copy applied and measured reaches the limit value itself.
  • the operator is thus warned by the appearance of the first signal, which can be an audible alarm, that the tightening torque exerted reaches a fraction equal, for example, to about 9/10 of the prescribed limit value.
  • Wandering can therefore first be carried out quickly, without paying attention to the indication of torque given by the display means, until the limit value approaches. Only after triggering of the first alarm signal, the operator finishes tightening more slowly and by monitoring the indication given by the display means, until the appearance of the second signal, which may be a light alarm, which indicates that the limit torque is reached and that tightening must not be continued.
  • the electrical supply means of the dynamometic key are arranged so as to maintain the supply of the circuits for a predetermined minimum duration, and to automatically cut this supply in the event of non-use the key at the end of this term, fixed for example 3 minutes FIPA b startup. Conversely, the electrical supply to the circuits of the "key is maintained as long as the stopping of use of the key remains less than said predetermined duration, if a tightening cut has been applied above the triggering threshold. switching the display means.
  • the torque wrench shown in Figures 1 to 3 comprises an elongated tubular body (1), of oval cross section, one end of which is provided with a part (2) arranged so as to receive a removable driving head (3 ), adapted to the element to be tightened such as a bolt, and the opposite end (4) of which is notched and shaped like a grip handle.
  • the body (1) of the key externally comprises a series of push-buttons or control keys (5), as well as a digital display (6) for example with liquid crystal, used alternately to program the desired tightening torque and to indicate the value of the tightening torque actually applied.
  • the end of the body (1) opposite the drive head (3) is closed by a removable plug (7) giving access to an electric battery (8) which supplies the energy necessary for the various circuits of the torque wrench.
  • the part (2) which receives the drive head (3) is extended by a tail (9) embedded by two of its edges in the tubular body (1).
  • This tail (9) is connected, via a connecting pin (10), to an elongated plate (11) extending inside the tubular body (1), over a large part of the length of the latter, and serving as support for the various circuits electronic (12-13) as well as the digital display (6).
  • These electronic circuits make it possible to process the electrical signal coming from the strain gauges (14), stuck on a constricted zone (9a), undergoing bending and connecting the tail (9) to the part (2) receiving the driving head.
  • the signal from the gauges (14) is proportional to the tightening torque applied to the handle (4) and transmitted by the tubular body (1) to the drive head (3) - see in particular Figure 2.
  • FIG. 4 represents, in the form of a block diagram, the essential circuits of the electronic part of this torque wrench.
  • the amplification circuits (16) include means ensuring the rectification and switching of the reverse signal, when working the key in the opposite direction, tightening or loosening.
  • these amplification circuits ensure the switching command of the display, for the automatic passage from the indication of the programmed limit value of the tightening torque (Cm) to the indication of the measured value, therefore real of the applied tightening torque (C). This switching occurs when the torque applied by means of the key exceeds a threshold (Co) fixed for example at 15 Nm.
  • a programming control circuit (17) is associated, for example, with two of the push buttons (5), to allow rapid coarse programming, then slower fine programming of the desired limit value of the tightening torque (Cm) .
  • the programming control circuit (17) is connected to a circuit for memorizing the torque and switching the display (18), connected to the digital display (6) and making it possible to switch the indication of this display (torque program Cm or applied torque (C).
  • the digital display (6) itself is associated with analog-digital conversion circuits, display memory storage circuits (19), and memory erasure circuits (20).
  • the programming control circuit (17) comprises means, such as a capacitor, or accumulator, making it possible to maintain the selected logic state, at the value of the limit torque (Cm), for a determined time, of l '' about two to three hours, that the key is no longer used or that its means of electrical power are interrupted. This allows the predetermined programming to be maintained in the event of the key not being used or the batteries being replaced.
  • Comparison circuits (21) compare the value of the applied and measured tightening torque (C) with the torque limit value (Cm) prescribed using the programming control circuit (17).
  • the comparison circuits (21) also ensure a comparison of the value of the applied and measured tightening torque (C) with a fraction (k.Cm) of the prescribed limit value, the coefficient "k” being, for example, equal to 0.9.
  • the comparison circuits (21) are connected to signaling means (22), which may include an audible alarm (23) and a light alarm (24).
  • signaling means (22) which may include an audible alarm (23) and a light alarm (24).
  • the memory circuits (19) make it possible to store in memory, and to indicate on the digital display (6), the maximum value of the torque (C) applied for a short given time, of the order of 5 seconds for example .
  • this memory is erased by the circuits (20) and the display (6) again indicates the programmed value (Cm).
  • the display In the event of resumption of tightening after a fairly short release time, and as soon as the torque exerted (C) exceeds the threshold (Co) of 15 Nm for example, the display is automatically switched by the circuit (18) to indicate the actual torque (C) and no longer the programmed value (Cm).
  • the power circuits (15) are such that, on the contrary, if a torque (C) greater than the threshold (Co) of 15 Nm has been applied, the power supply is maintained as long as the stops in use of the key remain less than 3 minutes.
  • this key can be used to transmit torques in both directions, when tightening or loosening.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Dental Preparations (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Lock And Its Accessories (AREA)
  • Control Of Charge By Means Of Generators (AREA)
EP85420137A 1984-07-23 1985-07-22 Elektronischer Drehmomentschlüssel Expired EP0172120B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85420137T ATE31262T1 (de) 1984-07-23 1985-07-22 Elektronischer drehmomentschluessel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8411917A FR2568010B1 (fr) 1984-07-23 1984-07-23 Cle dynamometrique electronique
FR8411917 1984-07-23

Publications (2)

Publication Number Publication Date
EP0172120A1 true EP0172120A1 (de) 1986-02-19
EP0172120B1 EP0172120B1 (de) 1987-12-09

Family

ID=9306543

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85420137A Expired EP0172120B1 (de) 1984-07-23 1985-07-22 Elektronischer Drehmomentschlüssel

Country Status (6)

Country Link
US (1) US4669319A (de)
EP (1) EP0172120B1 (de)
JP (1) JPS61109669A (de)
AT (1) ATE31262T1 (de)
DE (1) DE3561136D1 (de)
FR (1) FR2568010B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0293310A1 (de) * 1987-05-27 1988-11-30 SAM OUTILLAGE Société Anonyme Verfahren zum Kalibrieren eines elektronischen Drehmomentschlüssels
FR2615777A2 (fr) * 1984-07-23 1988-12-02 Sam Outillage Structure de cle dynamometrique electronique
EP0362696A1 (de) * 1988-10-03 1990-04-11 Snap-On Tools Corporation Schraubenschlüssel mit von der Handhaltung unabhängigen Messeinrichtung
EP0490376A1 (de) * 1990-12-13 1992-06-17 Saltus-Werk Max Forst GmbH & Co. Drehmomentschlüssel
WO2003041914A2 (en) * 2001-11-14 2003-05-22 Snap-On Technologies, Inc. Electronic torque wrench

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4987806A (en) * 1989-02-13 1991-01-29 Gse, Inc. Electronic control circuitry for a nutrunner
US5130700A (en) * 1991-03-04 1992-07-14 Snap-On Tools Corporation Electronic torque wrench and overshoot compensation circuit therefor
US5321506A (en) * 1991-06-14 1994-06-14 Usx Corporation Automatic screw-on pipe couplings
US5236053A (en) * 1992-05-15 1993-08-17 Aseptico, Incorporated Torque system
US5918201A (en) * 1996-10-25 1999-06-29 Gpx Corporation System and method for monitoring tool cycles
US5898598A (en) * 1996-10-25 1999-04-27 Cooper Technologies Company System and apparatus for a torque transducer with data processing capabilities
JPH10156743A (ja) * 1996-12-05 1998-06-16 Tohnichi Mfg Co Ltd トルクドライバー
US6070506A (en) * 1998-07-20 2000-06-06 Snap-On Tools Company Ratchet head electronic torque wrench
US6463811B1 (en) 1999-04-28 2002-10-15 Snap-On Tools Company Bending beam torque wrench
DE10023174A1 (de) * 2000-05-11 2001-11-22 Bosch Gmbh Robert Werkzeugmaschine, insbesondere Handwerkzeugmaschine
US6784799B2 (en) * 2002-08-07 2004-08-31 Chih-Ching Hsien Tension meter and wrench arrangement
US6910390B2 (en) * 2002-10-31 2005-06-28 Plastic Technologies, Inc. Hand held torque meter
US6796190B2 (en) * 2003-02-19 2004-09-28 Snap-On Incorporated Electronic torque wrench with flexible head
US7107884B2 (en) * 2003-10-03 2006-09-19 Snap-On Incorporated Ergonomic electronic torque wrench
DE102004003191A1 (de) * 2004-01-22 2005-08-11 Robert Bosch Gmbh Elektrohandwerkzeug mit Speichermöglichkeit
US7699118B2 (en) * 2004-01-30 2010-04-20 Abas, Inc. System and method for controlling an impact tool
TWI240666B (en) * 2004-08-23 2005-10-01 Shiuan-Sen Shiau Electronic torque wrench
US6948380B1 (en) * 2004-08-23 2005-09-27 Stand Tools Enterprise Co., Ltd. Torque-indicating wrench
DE102005062883A1 (de) * 2005-12-29 2007-07-05 Robert Bosch Gmbh Schwingungsreduktion bei Elektrowerkzeugen
US20080127711A1 (en) * 2006-12-04 2008-06-05 Farag Tarek A Z Force and Torque Measurements with Calibration and Auto Scale
US8087330B2 (en) * 2006-12-05 2012-01-03 Chih-Ching Hsieh Hand tool with warning effect
US20080127786A1 (en) * 2006-12-05 2008-06-05 Chih-Ching Hsieh Hand tool with earphone
US8201464B2 (en) * 2008-09-02 2012-06-19 Easco Hand Tools Inc Electronic torque wrench with a manual input device
US8215258B2 (en) * 2008-11-21 2012-07-10 Charles R. Givens Alarmed chuck wrench
SE532720C2 (sv) 2008-12-22 2010-03-23 Atlas Copco Tools Ab Handhållen mutterdragare med manuellt styrt effektstyrorgan
US7841245B1 (en) * 2009-06-09 2010-11-30 Hsin-Nien Chen Electronic torque wrench
US8714057B2 (en) * 2010-01-04 2014-05-06 Apex Brands, Inc. Ratcheting device for an electronic torque wrench
US8413525B1 (en) * 2012-06-11 2013-04-09 Thru Tubing Solutions, Inc. Portable torque measurement and notification system and method of using same
US8549932B1 (en) 2012-06-11 2013-10-08 Thru Tubing Solutions, Inc. Portable torque measurement and notification system and method of using same
US8528423B1 (en) 2012-06-11 2013-09-10 Thru Tubing Solutions, Inc. Portable torque measurement and notification system and method of using same
US9395257B2 (en) * 2013-05-10 2016-07-19 Snap-On Incorporated Electronic torque tool with integrated real-time clock
US11453105B2 (en) 2016-09-13 2022-09-27 Milwaukee Electric Tool Corporation Powered ratcheting torque wrench
US10625405B2 (en) 2016-09-13 2020-04-21 Milwaukee Electric Tool Corporation Powered ratcheting torque wrench
TWI671166B (zh) * 2018-12-06 2019-09-11 優鋼機械股份有限公司 電子扭力扳手之管身

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296835A1 (fr) * 1974-01-14 1976-07-30 Jo Line Tools Cle dynamometrique electronique
FR2497347A1 (fr) * 1980-12-31 1982-07-02 Sicame Sa Clef dynamometrique electronique, et appareillage d'intervention sur conducteurs electriques a l'aide d'une perche, muni d'une telle clef
US4397196A (en) * 1979-08-29 1983-08-09 Lemelson Jerome H Electronic tool and method
EP0100023A2 (de) * 1982-07-28 1984-02-08 Jomi Trust Reg. Drehmomentschlüssel
EP0119928A1 (de) * 1983-03-17 1984-09-26 Facom Anziehwerkzeug mit Anzeige des Anzugsdrehmoments

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558601A (en) * 1984-01-06 1985-12-17 J. S. Technology, Inc. Digital indicating torque wrench

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296835A1 (fr) * 1974-01-14 1976-07-30 Jo Line Tools Cle dynamometrique electronique
US4397196A (en) * 1979-08-29 1983-08-09 Lemelson Jerome H Electronic tool and method
FR2497347A1 (fr) * 1980-12-31 1982-07-02 Sicame Sa Clef dynamometrique electronique, et appareillage d'intervention sur conducteurs electriques a l'aide d'une perche, muni d'une telle clef
EP0100023A2 (de) * 1982-07-28 1984-02-08 Jomi Trust Reg. Drehmomentschlüssel
EP0119928A1 (de) * 1983-03-17 1984-09-26 Facom Anziehwerkzeug mit Anzeige des Anzugsdrehmoments

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615777A2 (fr) * 1984-07-23 1988-12-02 Sam Outillage Structure de cle dynamometrique electronique
EP0293310A1 (de) * 1987-05-27 1988-11-30 SAM OUTILLAGE Société Anonyme Verfahren zum Kalibrieren eines elektronischen Drehmomentschlüssels
FR2615948A1 (fr) * 1987-05-27 1988-12-02 Sam Outillage Cle dynamometrique electronique
US4864841A (en) * 1987-05-27 1989-09-12 Sam Outillage Electronic torque wrench
EP0362696A1 (de) * 1988-10-03 1990-04-11 Snap-On Tools Corporation Schraubenschlüssel mit von der Handhaltung unabhängigen Messeinrichtung
EP0490376A1 (de) * 1990-12-13 1992-06-17 Saltus-Werk Max Forst GmbH & Co. Drehmomentschlüssel
US5303601A (en) * 1990-12-13 1994-04-19 Saltus-Werk Max Forst Gmbh & Co. Torque wrench
WO2003041914A2 (en) * 2001-11-14 2003-05-22 Snap-On Technologies, Inc. Electronic torque wrench
WO2003041914A3 (en) * 2001-11-14 2003-11-13 Snap On Tech Inc Electronic torque wrench

Also Published As

Publication number Publication date
DE3561136D1 (en) 1988-01-21
US4669319A (en) 1987-06-02
EP0172120B1 (de) 1987-12-09
ATE31262T1 (de) 1987-12-15
FR2568010B1 (fr) 1987-05-15
JPS61109669A (ja) 1986-05-28
FR2568010A1 (fr) 1986-01-24

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