EP0723839A1 - Torque wrench - Google Patents

Torque wrench Download PDF

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Publication number
EP0723839A1
EP0723839A1 EP95118584A EP95118584A EP0723839A1 EP 0723839 A1 EP0723839 A1 EP 0723839A1 EP 95118584 A EP95118584 A EP 95118584A EP 95118584 A EP95118584 A EP 95118584A EP 0723839 A1 EP0723839 A1 EP 0723839A1
Authority
EP
European Patent Office
Prior art keywords
torque
shaft
display
shafts
torque wrench
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
EP95118584A
Other languages
German (de)
French (fr)
Other versions
EP0723839B1 (en
Inventor
Hermann J. Zerver
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.)
Hazet Werk Hermann Zerver GmbH and Co KG
Original Assignee
Hazet Werk Hermann Zerver GmbH and Co KG
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.)
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Publication of EP0723839A1 publication Critical patent/EP0723839A1/en
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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
    • 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
    • B25B23/1427—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 mechanical means

Definitions

  • the invention relates to a torque wrench for the controlled tightening of screws, nuts, etc.
  • Torque wrenches with adjustable torque values are known. Exceeding the set torque becomes noticeable to the user by briefly giving in the torque wrench, the so-called "triggering". The user feels a short jerk, combined with a cracking sound, which signals to him that the set torque value has now been reached.
  • the invention has for its object to provide a torque wrench working with mechanical triggering, which enables a more precise dosing of the tightening torque.
  • a torque wrench for the controlled tightening of screws, nuts, etc. is proposed with a first shaft, which is provided with a handle at its outer end, a second shank, which is fixedly connected to a tool head, a pivot pin which connects the shanks in an articulated manner and has an axis oriented transversely to the tightening direction, a spring-loaded locking element arranged between two opposite receptacles of the shafts, which locks the shafts against one another below an adjustable torque value and unlocks them above the torque value, so that they can carry out a limited relative pivoting, a measuring element for detecting the material stresses acting on one of the shafts, an evaluation unit for processing the measured values of the measuring element and for converting the measured values into torque values, and a display element for displaying the predetermined torque value and for the continuous display of the calculated torque values.
  • Such a torque wrench enables the user to meter the tightening torque particularly precisely.
  • the current torque values are continuously determined and displayed to the user via the display element. In this way, it is possible for the user to estimate at any time how far the tightening torque applied has already approximated the adjustable maximum torque value. After recognizing that the triggering torque is soon to be reached, the user can therefore meter his force in a targeted manner until the triggering value is reached. The risk of overtightening due to excessive tightening of the torque wrench in the area of the trigger value is significantly reduced.
  • the locking element is a cube-shaped tilting element which at the same time rests on the receiving surfaces of both shafts.
  • the one shaft encases the other shaft over part of its length, and that the measuring element is a strain measuring element which is embedded in the outer surface of the inner shaft.
  • the evaluation unit have a data interface for calling up the measurement data from outside.
  • the tightening torques generated with the torque wrench can be documented, for example as part of a quality control.
  • the evaluation unit be provided with a memory for measurement data.
  • the display element has, among other things, a graphic display, the display being optically assigned a maximum value display representative of the set torque value.
  • a graphic display e.g. a bar display can be used.
  • the torque wrench consists in a manner known per se from a tool head 1 with a tool drive element in the form of a switchable ratchet element, one fastened at the opposite end Handle 2 and a rod 3 for applying a sufficiently large lifting arm.
  • the rod 3 is composed of a first shaft 4, which is connected to the handle 2, and a second shaft 5, which is firmly connected to the tool head 1.
  • a pivot pin 6 fastened in the first shaft 4 near the tool head 1 and having an axis 7 oriented transversely to the tightening direction connects the first shaft 4 to the second shaft 5.
  • the first shaft 4 is tubular and surrounds the second shaft 5, which is designed as an elongated cylinder
  • the second shaft 5 is provided at its end facing away from the tool head 1 with an end face 8 into which a square receptacle 9 for a cube-shaped tilting element 10 is incorporated.
  • the opposite surface of the tilting element 10 is supported on a further receptacle 11, which is formed in the end face of a pressure piece 12.
  • the pressure piece 12 On the end face facing away from the receptacle 11, the pressure piece 12 is acted upon by the force of a compression spring 13, the spring tension of which can be adjusted by turning the handle 2.
  • the outer section 14 of the first shaft 4 connected to the handle 2 can be rotated relative to the remaining length of the first shaft 4.
  • the position of the outer end of the compression spring 13 is changed so that its tension is adjustable.
  • the size of the setting value can be read on the display element 18.
  • a housing 16 is fastened on the first shaft 4.
  • the housing is provided with an evaluation unit, which is preferably arranged on a circuit board 17, and has a display element 18 in the form of an LCD display on its upper side.
  • an evaluation unit which is preferably arranged on a circuit board 17, and has a display element 18 in the form of an LCD display on its upper side.
  • a compartment for several rechargeable batteries or batteries 19 is provided in the lower part of the housing 16.
  • Measuring elements 20 in the form of strain gauges are attached to the outside of the second shaft 5 in the vicinity of the pivot pin 6.
  • the strain gauges are arranged on the tension side and the pressure side of the first shaft 4.
  • Signal lines 21 lead from the measuring elements 20 to the evaluation unit 17.
  • Functions and measurement data can be called up via various keys 22 arranged on the upper side of the housing 16.
  • the measurement results are shown on the display element 18.
  • the torque wrench can be connected to external data evaluation devices, for example a printer or central data acquisition, via plug contacts 23.
  • An indicator light 24 indicates to the user that the battery capacity is sufficient.
  • the desired torque value is first set by turning the handle 2.
  • the torque value set in this way is digitally displayed on the display element 18.
  • the tool head 1 with the tool attached to its square is placed on the screw or nut to be tightened, and the required tightening torque is applied.
  • the current torque is digitally displayed at any time on the display element 18.
  • a graphic display 25 is provided, in which the length of the graphic 26 shown is a measure of the torque value currently being generated.
  • there is a maximum value display 27 in optical association By comparing the graphic 26 with the location of the maximum value display 27, the user can determine at any time how far the current torque value has already approached the maximum value. In this way, particularly sensitive work is possible until the maximum value is reached.
  • the graphic 26 and the maximum value display 27 are preferably only visible when at least half of the maximum value has been reached.
  • the user is also signaled that the desired torque has been reached in that the torque wrench is triggered.
  • This state is reached as soon as the bending load acting on the second shaft 5 leads to a tilting of the tilting element 10 originally resting on both receptacles 9, 11.
  • a slight but sudden change in the angle between the first shaft 4 and the second shaft 5 occurs about the axis 7, which is clearly perceptible to the user and is also accompanied by a clearly audible, cracking noise.
  • this is the sign that the desired torque value has been reached.
  • the evaluation unit 17 is provided with a memory in order to store a large number of previous torque values for the purpose of checking or documentation.
  • the stored values can also be called up from outside or printed out there, for which purpose the data interface in the form of the plug contacts 23 is provided.
  • Additional functions can be called up via the keys 22, for example maximum values, minimum values or average values. A distinction can also be made according to the set, triggered and reached torque value, and these can be displayed separately. A conversion and display in other measurement systems is also possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

The torque wrench has a first shaft (4) with a handle on its outer end, a second shaft (5) rigidly attached to the tool head (1), a pivot bolt (6) linking the shafts with its axis perpendicular to the tightening direction, a spring-loaded locking element and an evaluation unit. The locking element, which is mounted between shaft holders (9,11), locks the shafts together below a defined torque level and releases them above it to enable limited relative movement. A measurement element (20) measures the material stresses acting on one shaft. The evaluation unit converts the measurement value into a torque which is displayed (18) with the defined torque value.

Description

Die Erfindung betrifft einen Drehmomentschlüssel zum kontrollierten Anziehen von Schrauben, Muttern etc. Drehmomentschlüssel mit einstellbaren Drehmomentwerten sind bekannt. Das Überschreiten des eingestellten Drehmoments macht sich für den Benutzer durch ein kurzzeitiges Nachgeben des Drehmomentschlüssels, das sogenannte "Auslösen", bemerkbar. Der Benutzer spürt einen kurzen Ruck, verbunden mit einem knackenden Geräusch, wodurch ihm signalisiert ist, daß nunmehr der eingestellte Drehmomentwert erreicht ist.The invention relates to a torque wrench for the controlled tightening of screws, nuts, etc. Torque wrenches with adjustable torque values are known. Exceeding the set torque becomes noticeable to the user by briefly giving in the torque wrench, the so-called "triggering". The user feels a short jerk, combined with a cracking sound, which signals to him that the set torque value has now been reached.

Eine wirklich genaue Dosierung des Anzugsmomentes ist mit einem solchen Drehmomentschlüssel nicht möglich, da bei einem forcierten Anziehen des Drehmomentschlüssels nach Erreichen des eingestellten Drehmomentes keine wirkliche Auslösung im Sinne einer sofortigen Unterbrechung des Anzugsmomentes stattfindet. Vielmehr führt die Auslösung nur zu einem kurzzeitigen Absinken des Anzugsmomentes, worauf dann anschließend sofort wieder das vom Benutzer aufgebrachte Hebelmoment einwirkt. Denn infolge der Geschwindigkeit, mit der diese Vorgänge ablaufen, hat es der Benutzer praktisch nicht in der Hand, auf das Auslösesignal sofort mit einem Beenden der Anzugskraft zu reagieren. Der Drehmomentschlüssel wird über den eingestellten Anzugswert hinaus "überrissen".A really precise metering of the tightening torque is not possible with such a torque wrench, because if the torque wrench is forced to tighten after reaching the set torque, there is no real triggering in the sense of an immediate interruption of the tightening torque. Rather, the triggering only leads to a brief drop in the tightening torque, which then immediately affects the lever torque applied by the user. Because of the speed at which these processes take place, it is practically impossible for the user to react immediately to the trigger signal by stopping the tightening force. The torque wrench is "overwritten" beyond the set tightening value.

Der Erfindung liegt die Aufgabe zugrunde, einen mit mechanischer Auslösung arbeitenden Drehmomentschlüssel zu schaffen, der eine genauere Dosierung des Anzugsmomentes ermöglicht.The invention has for its object to provide a torque wrench working with mechanical triggering, which enables a more precise dosing of the tightening torque.

Zur Lösung dieser Aufgabe wird ein Drehmomentschlüssel zum kontrollierten Anziehen von Schrauben, Muttern etc. vorgeschlagen, mit
   einem ersten Schaft, der an seinem äußeren Ende mit einem Handgriff versehen ist,
   einem zweiten Schaft, der fest mit einem Werkzeugkopf verbunden ist, einem die Schäfte gelenkig verbindenden Schwenkbolzen mit quer zur Anzugsrichtung ausgerichteter Achse,
   einem zwischen zwei einander gegenüberliegenden Aufnahmen der Schäfte angeordneten, federbelasteten Sperrelement, welches die Schäfte unterhalb eines einstellbaren Drehmomentwertes gegeneinander sperrt und oberhalb des Drehmomentwertes entsperrt, so daß diese eine begrenzte Relativverschwenkung durchführen können,
   einem Meßelement zum Erfassen der an einem der Schäfte wirkenden Materialspannungen,
   einer Auswerteeinheit zur Verarbeitung der Meßwerte des Meßelementes und zur Umrechnung der Meßwerte in Drehmomentwerte,
   und einem Anzeigeelement für die Anzeige des vorgegebenen Drehmomentwertes sowie für die stufenlose Anzeige der errechneten Drehmomentwerte.To solve this problem, a torque wrench for the controlled tightening of screws, nuts, etc. is proposed with
a first shaft, which is provided with a handle at its outer end,
a second shank, which is fixedly connected to a tool head, a pivot pin which connects the shanks in an articulated manner and has an axis oriented transversely to the tightening direction,
a spring-loaded locking element arranged between two opposite receptacles of the shafts, which locks the shafts against one another below an adjustable torque value and unlocks them above the torque value, so that they can carry out a limited relative pivoting,
a measuring element for detecting the material stresses acting on one of the shafts,
an evaluation unit for processing the measured values of the measuring element and for converting the measured values into torque values,
and a display element for displaying the predetermined torque value and for the continuous display of the calculated torque values.

Ein solcher Drehmomentschlüssel ermöglicht dem Benutzer eine besonders genaue Dosierung des Anzugsmomentes. Die aktuellen Drehmomentwerte werden laufend ermittelt, und dem Benutzer über das Anzeigeelement angezeigt. Für den Benutzer ist auf diese Weise jederzeit abschätzbar, wie weit das von ihm aufgebrachte Anzugsmoment sich bereits dem einstellbaren maximalen Drehmomentwert angenähert hat. Der Benutzer kann daher, nachdem er das baldige Erreichen des Auslösemomentes erkennt, seine Kraft gezielt bis zum Erreichen des Auslösewertes dosieren. Die Gefahr eines Überreißens durch ein im Bereich des Auslösewertes zu heftiges Anziehen des Drehmomentschlüssels wird deutlich vermindert.Such a torque wrench enables the user to meter the tightening torque particularly precisely. The current torque values are continuously determined and displayed to the user via the display element. In this way, it is possible for the user to estimate at any time how far the tightening torque applied has already approximated the adjustable maximum torque value. After recognizing that the triggering torque is soon to be reached, the user can therefore meter his force in a targeted manner until the triggering value is reached. The risk of overtightening due to excessive tightening of the torque wrench in the area of the trigger value is significantly reduced.

Gemäß einer bevorzugten Weiterbildung ist das Sperrelement ein würfelförmiges Kippelement, welches zugleich an Aufnahmeflächen beider Schäfte anliegt.According to a preferred development, the locking element is a cube-shaped tilting element which at the same time rests on the receiving surfaces of both shafts.

Mit der Erfindung wird ferner vorgeschlagen, daß der eine Schaft den anderen Schaft auf einem Teil von dessen Länge umhüllt, und daß das Meßelement ein Dehnungsmeßelement ist, welches in die Mantelfläche des innenliegenden Schaftes eingelassen ist.With the invention it is further proposed that the one shaft encases the other shaft over part of its length, and that the measuring element is a strain measuring element which is embedded in the outer surface of the inner shaft.

In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß die Auswerteeinheit über eine Datenschnittstelle zum Abrufen der Meßdaten von außerhalb verfügt. Auf diese Weise lassen sich die mit dem Drehmomentschlüssel erzeugten Anzugsmomente dokumentieren, etwa im Rahmen einer Qualitätskontrolle.In a further embodiment of the invention it is proposed that the evaluation unit have a data interface for calling up the measurement data from outside. In this way, the tightening torques generated with the torque wrench can be documented, for example as part of a quality control.

Zum Zwecke einer Dokumentation der erreichten Auslösewerte wird ferner vorgeschlagen, daß die Auswerteeinheit mit einem Speicher für Meßdaten versehen ist.For the purpose of documenting the tripping values achieved, it is also proposed that the evaluation unit be provided with a memory for measurement data.

Schließlich ist vorgesehen, daß das Anzeigeelement unter anderem über eine graphische Anzeige verfügt, wobei der Anzeige eine für den eingestellten Drehmomentwert repräsentative Maximalwert-Anzeige optisch zugeordnet ist. Der Benutzer kann durch Beobachten der Anzeige exakt nachverfolgen, inwieweit sich der momentan erzeugte Drehmomentwert bereits dem Maximalwert angenähert hat. Dadurch ist eine besonders feinfühlige Betätigung des Drehmomentschlüssels bis zum Erreichen des Auslösewertes möglich, ohne daß der Benutzer, wie dies bei Verwendung einer Ziffernanzeige erforderlich wäre, laufend Differenzwerte berechnen muß. Als graphische Anzeige kann z.B. eine Balken-Anzeige verwendet werden.Finally, it is provided that the display element has, among other things, a graphic display, the display being optically assigned a maximum value display representative of the set torque value. By observing the display, the user can track exactly to what extent the torque value currently generated has already approached the maximum value. This enables a particularly sensitive actuation of the torque wrench until the trigger value is reached, without the user having to continuously calculate difference values, as would be necessary when using a numerical display. As a graphic display e.g. a bar display can be used.

In der Zeichnung ist ein Ausführungsbeispiel eines Drehmomentschlüssels der erfindungsgemäßen Art dargestellt. Darin zeigen:

Fig. 1
in einem teilweisen Längsschnitt einen Drehmomentschlüssel und
Fig. 2
eine Draufsicht auf den Drehmomentschlüssel nach Fig. 1.
In the drawing, an embodiment of a torque wrench of the type according to the invention is shown. In it show:
Fig. 1
in a partial longitudinal section a torque wrench and
Fig. 2
a plan view of the torque wrench of FIG. 1st

Der Drehmomentschlüssel besteht in an sich bekannter Weise aus einem Werkzeugkopf 1 mit einem Werkzeugantriebselement in Form eines umschaltbaren Ratschenelements, einem am entgegengesetzten Ende befestigten Handgriff 2 sowie einem Stab 3 zum Aufbringen eines hinreichend großen Hebearms.The torque wrench consists in a manner known per se from a tool head 1 with a tool drive element in the form of a switchable ratchet element, one fastened at the opposite end Handle 2 and a rod 3 for applying a sufficiently large lifting arm.

Der Stab 3 setzt sich aus einem ersten Schaft 4, der mit dem Handgriff 2 verbunden ist, sowie einem zweiten Schaft 5 zusammen, der fest mit dem Werkzeugkopf 1 verbunden ist. Ein nahe dem Werkzeugkopf 1 in dem ersten Schaft 4 befestigter Schwenkbolzen 6 mit quer zur Anzugsrichtung ausgerichteter Achse 7 verbindet den ersten Schaft 4 mit dem zweiten Schaft 5. Hierbei ist der erste Schaft 4 rohrförmig ausgebildet, und umschließt den als langgestreckter Zylinder ausgebildeten zweiten Schaft 5. Der zweite Schaft 5 ist an seinem dem Werkzeugkopf 1 abgewandten Ende mit einer Stirnfläche 8 versehen, in die eine quadratische Aufnahme 9 für ein würfelförmiges Kippelement 10 eingearbeitet ist. Die gegenüberliegende Fläche des Kippelementes 10 stützt sich an einer weiteren Aufnahme 11 ab, die in der Stirnfläche eines Druckstückes 12 ausgebildet ist. An der der Aufnahme 11 abgewandten Stirnfläche wird das Druckstück 12 durch die Kraft einer Druckfeder 13 beaufschlagt, deren Federspannung sich durch Verdrehen des Handgriffs 2 einstellen läßt. Hierzu ist der mit dem Handgriff 2 verbundene äußere Abschnitt 14 des ersten Schaftes 4 gegenüber der übrigen Länge des ersten Schaftes 4 verdrehbar. Durch Verdrehen dieser Teile zueinander wird die Lage des äußeren Endes der Druckfeder 13 verändert, so daß deren Spannung einstellbar ist. Die Größe des Einstellwertes kann auf dem Anzeigeelement 18 abgelesen werden.The rod 3 is composed of a first shaft 4, which is connected to the handle 2, and a second shaft 5, which is firmly connected to the tool head 1. A pivot pin 6 fastened in the first shaft 4 near the tool head 1 and having an axis 7 oriented transversely to the tightening direction connects the first shaft 4 to the second shaft 5. Here, the first shaft 4 is tubular and surrounds the second shaft 5, which is designed as an elongated cylinder The second shaft 5 is provided at its end facing away from the tool head 1 with an end face 8 into which a square receptacle 9 for a cube-shaped tilting element 10 is incorporated. The opposite surface of the tilting element 10 is supported on a further receptacle 11, which is formed in the end face of a pressure piece 12. On the end face facing away from the receptacle 11, the pressure piece 12 is acted upon by the force of a compression spring 13, the spring tension of which can be adjusted by turning the handle 2. For this purpose, the outer section 14 of the first shaft 4 connected to the handle 2 can be rotated relative to the remaining length of the first shaft 4. By rotating these parts to each other, the position of the outer end of the compression spring 13 is changed so that its tension is adjustable. The size of the setting value can be read on the display element 18.

Auf dem ersten Schaft 4 ist ein Gehäuse 16 befestigt. Das Gehäuse ist mit einer vorzugsweise auf einer Platine 17 angeordneten Auswerteeinheit versehen, und weist an seiner Oberseite ein Anzeigeelement 18 in Gestalt einer LCD-Anzeige auf. Zur elektrischen Versorgung der Auswerteeinheit 17 sowie des Anzeigeelementes 18 ist im unteren Teil des Gehäuses 16 ein Fach für mehrere Akkus oder Batterien 19 vorgesehen.A housing 16 is fastened on the first shaft 4. The housing is provided with an evaluation unit, which is preferably arranged on a circuit board 17, and has a display element 18 in the form of an LCD display on its upper side. For the electrical supply of the evaluation unit 17 and the display element 18, a compartment for several rechargeable batteries or batteries 19 is provided in the lower part of the housing 16.

Meßelemente 20 in Gestalt von Dehnungsmeßstreifen sind auf der Außenseite des zweiten Schaftes 5 in der Nähe des Schwenkbolzens 6 angebracht. Die Anordnung der Dehnungsmeßstreifen erfolgt auf der Zug- sowie der Druckseite des ersten Schaftes 4. Signalleitungen 21 führen von den Meßelementen 20 zu der Auswerteeinheit 17.Measuring elements 20 in the form of strain gauges are attached to the outside of the second shaft 5 in the vicinity of the pivot pin 6. The strain gauges are arranged on the tension side and the pressure side of the first shaft 4. Signal lines 21 lead from the measuring elements 20 to the evaluation unit 17.

Über verschiedene, auf der Oberseite des Gehäuses 16 angeordnete Tasten 22 lassen sich Funktionen und Meßdaten abrufen. Die Meßergebnisse werden auf dem Anzeigeelement 18 dargestellt. Über Steckkontakte 23 ist ein Anschluß des Drehmomentschlüssels an externe Datenauswertegeräte möglich, zum Beispiel einen Drucker oder eine zentrale Datenerfassung. Eine Kontrollleuchte 24 zeigt dem Benutzer an, daß die Batteriekapazität ausreichend ist.Functions and measurement data can be called up via various keys 22 arranged on the upper side of the housing 16. The measurement results are shown on the display element 18. The torque wrench can be connected to external data evaluation devices, for example a printer or central data acquisition, via plug contacts 23. An indicator light 24 indicates to the user that the battery capacity is sufficient.

Im Gebrauch wird zunächst durch Verdrehen des Handgriffs 2 der gewünschte Drehmomentwert eingestellt. Der so eingestellte Drehmomentwert wird digital auf dem Anzeigeelement 18 angezeigt. Sodann wird der Werkzeugkopf 1 mit dem an dessen Vierkant befestigten Werkzeug auf die anzuziehende Schraube oder Mutter aufgesetzt, und das erforderliche Anzugsmoment aufgebracht. Das aktuell vorliegende Drehmoment wird jederzeit digital auf dem Anzeigeelement 18 angezeigt. Zusätzlich ist eine graphische Anzeige 25 vorgesehen, bei der die Länge der dargestellten Grafik 26 ein Maß für den aktuell erzeugten Drehmomentwert ist. Neben der Grafik 26 befindet sich in optischer Zuordnung eine Maximalwert-Anzeige 27. Durch Vergleich der Grafik 26 mit dem Ort der Maximalwert-Anzeige 27 kann der Benutzer jederzeit feststellen, wie weit sich der aktuelle Drehmomentwert bereits dem Maximalwert genähert hat. Auf diese Weise ist ein besonders feinfühliges Arbeiten bis zum Erreichen des Maximalwertes möglich. Vorzugsweise ist die Grafik 26 und die Maximalwert-Anzeige 27 erst dann sichtbar, wenn zumindest die Hälfte des Maximalwertes erreicht ist.In use, the desired torque value is first set by turning the handle 2. The torque value set in this way is digitally displayed on the display element 18. Then the tool head 1 with the tool attached to its square is placed on the screw or nut to be tightened, and the required tightening torque is applied. The current torque is digitally displayed at any time on the display element 18. In addition, a graphic display 25 is provided, in which the length of the graphic 26 shown is a measure of the torque value currently being generated. In addition to the graphic 26 there is a maximum value display 27 in optical association. By comparing the graphic 26 with the location of the maximum value display 27, the user can determine at any time how far the current torque value has already approached the maximum value. In this way, particularly sensitive work is possible until the maximum value is reached. The graphic 26 and the maximum value display 27 are preferably only visible when at least half of the maximum value has been reached.

Dem Benutzer wird das Erreichen des gewünschten Drehmomentes ferner dadurch signalisiert, daß der Drehmomentschlüssel auslöst. Dieser Zustand ist erreicht, sobald die auf den zweiten Schaft 5 einwirkende Biegebelastung zu einem Kippen des ursprünglich an beiden Aufnahmen 9, 11 anliegenden Kippelementes 10 führt. Infolge dieses Kippens tritt eine geringfügige, aber schlagartige Winkelveränderung zwischen erstem Schaft 4 und zweitem Schaft 5 um die Achse 7 auf, die für den Benutzer deutlich spürbar ist, und ferner von einem gut hörbaren, knackenden Geräusch begleitet wird. Für den Benutzer ist dies das Zeichen, das der gewünschte Drehmomentwert erreicht ist.The user is also signaled that the desired torque has been reached in that the torque wrench is triggered. This state is reached as soon as the bending load acting on the second shaft 5 leads to a tilting of the tilting element 10 originally resting on both receptacles 9, 11. As a result of this tilting, a slight but sudden change in the angle between the first shaft 4 and the second shaft 5 occurs about the axis 7, which is clearly perceptible to the user and is also accompanied by a clearly audible, cracking noise. For the user, this is the sign that the desired torque value has been reached.

Die Auswerteeinheit 17 ist mit einem Speicher versehen, um eine Vielzahl vorangegangener Drehmomentwerte zum Zwecke der Kontrolle oder Dokumentation abzuspeichern. Die gespeicherten Werte können auch von außerhalb abgerufen oder dort ausgedruckt werden, wozu die Datenschnittstelle in Gestalt der Steckkontakte 23 vorgesehen ist.The evaluation unit 17 is provided with a memory in order to store a large number of previous torque values for the purpose of checking or documentation. The stored values can also be called up from outside or printed out there, for which purpose the data interface in the form of the plug contacts 23 is provided.

Über die Tasten 22 lassen sich weitere Funktionen abrufen, zum Beispiel Höchstwerte, Mindestwerte oder Durchschnittswerte. Es kann außerdem nach eingestelltem, ausgelöstem und erreichtem Drehmomentwert unterschieden werden, und diese können getrennt angezeigt werden. Eine Umrechnung und Anzeige in anderen Maßsystemen ist ebenfalls möglich.Additional functions can be called up via the keys 22, for example maximum values, minimum values or average values. A distinction can also be made according to the set, triggered and reached torque value, and these can be displayed separately. A conversion and display in other measurement systems is also possible.

BezugszeichenlisteReference list

11
WerkzeugkopfTool head
22nd
HandgriffHandle
33rd
StabRod
44th
erster Schaftfirst shaft
55
zweiter Schaftsecond shaft
66
SchwenkbolzenSwivel pin
77
Achseaxis
88th
StirnflächeFace
99
Aufnahmeadmission
1010th
KippelementTilting element
1111
Aufnahmeadmission
1212th
DruckstückPressure piece
1313
DruckfederCompression spring
1414
äußerer Abschnitt des ersten Schaftesouter section of the first shaft
1616
Gehäusecasing
1717th
AuswerteeinheitEvaluation unit
1818th
AnzeigeelementDisplay element
1919th
Batteriebattery
2020th
MeßelementMeasuring element
2121
SignalleitungSignal line
2222
Tastebutton
2323
SteckkontaktPlug contact
2424th
KontrolleuchteIndicator light
2525th
graphische Anzeigegraphic display
2626
Grafikgraphic
2727
Maximalwert-AnzeigeMaximum value display

Claims (6)

Drehmomentschlüssel zum kontrollierten Anziehen von Schrauben, Muttern etc., mit
einem ersten Schaft (4), der an seinem äußeren Ende mit einem Handgriff versehen ist,
einem zweiten Schaft (5), der fest mit einem Werkzeugkopf (1) verbunden ist,
einem die Schäfte (4, 5) gelenkig verbindenden Schwenkbolzen (6) mit quer zur Anzugsrichtung ausgerichteter Achse,
einem zwischen zwei einander gegenüberliegenden Aufnahmen (9, 11) der Schäfte (5, 4) angeordneten, federbelasteten Sperrelement, welches die Schäfte (4, 5) unterhalb eines einstellbaren Drehmomentwertes gegeneinander sperrt und oberhalb des Drehmomentwertes entsperrt, so daß diese eine begrenzte Relativverschwenkung durchführen können, einem Meßelement (20) zum Erfassen der an einem der Schäfte (4, 5) wirkenden Materialspannungen,
einer Auswerteeinheit (17) zur Verarbeitung der Meßwerte des Meßelementes (20) und zur Umrechnung der Meßwerte in Drehmomentwerte, und einem Anzeigeelement (18) für die Anzeige des vorgegebenen Drehmomentwertes sowie für die stufenlose Anzeige der errechneten Drehmomentwerte.Torque wrench for the controlled tightening of screws, nuts etc. with
a first shaft (4) which is provided with a handle at its outer end,
a second shank (5) which is firmly connected to a tool head (1),
a pivot pin (6) which connects the shafts (4, 5) in an articulated manner and has an axis oriented transversely to the tightening direction
a spring-loaded locking element arranged between two opposite receptacles (9, 11) of the shafts (5, 4), which locks the shafts (4, 5) against one another below an adjustable torque value and unlocks them above the torque value, so that they carry out a limited relative pivoting a measuring element (20) for detecting the material stresses acting on one of the shafts (4, 5),
an evaluation unit (17) for processing the measured values of the measuring element (20) and for converting the measured values into torque values, and a display element (18) for displaying the specified torque value and for the continuous display of the calculated torque values. Drehmomentschlüssel nach Anspruch 1, dadurch gekennzeichnet, daß das Sperrelement (10) ein würfelförmiges Kippelement ist, welches zugleich an Aufnahmeflächen beider Schäfte (4, 5) anliegt.Torque wrench according to claim 1, characterized in that the locking element (10) is a cube-shaped tilting element which at the same time rests on the receiving surfaces of both shafts (4, 5). Drehmomentschlüssel nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß der eine Schaft (4) den anderen Schaft (5) auf einem Teil von dessen Länge umhüllt, und daß das Meßelement (20) ein Dehnungsmeßstreifen ist, welcher in die Mantelfläche des innenliegenden Schaftes (5) eingelassen ist.Torque wrench according to claim 1 or claim 2, characterized in that the one shaft (4) envelops the other shaft (5) over a part of its length, and in that the measuring element (20) is a strain gauge which fits into the outer surface of the inner shaft (5) is embedded. Drehmomentschlüssel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Auswerteeinheit (17) über eine Datenschnittstelle (bei 23) zum Abrufen der Meßdaten von außerhalb verfügt.Torque wrench according to one of the preceding claims, characterized in that the evaluation unit (17) has a data interface (at 23) for calling up the measurement data from outside. Drehmomentschlüssel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Auswerteeinheit (17) mit einem Speicher für Meßdaten versehen ist.Torque wrench according to one of the preceding claims, characterized in that the evaluation unit (17) is provided with a memory for measurement data. Drehmomentschlüssel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Anzeigeelement (18) unter anderem über eine graphische Anzeige (25), vorzugsweise eine Balken-Anzeige, verfügt, bei der die Länge der Grafik (26) ein Maß für den aktuellen Drehmomentwert ist, wobei der Grafik (26) eine für den eingestellten Drehmomentwert repräsentative Maximalwert-Anzeige (27) optisch zugeordnet ist.Torque wrench according to one of the preceding claims, characterized in that the display element (18) has, inter alia, a graphic display (25), preferably a bar display, in which the length of the graphic (26) is a measure of the current torque value The graphic (26) is optically assigned a maximum value display (27) representative of the set torque value.
EP95118584A 1995-01-28 1995-11-25 Torque wrench Expired - Lifetime EP0723839B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29501355U 1995-01-28
DE29501355U DE29501355U1 (en) 1995-01-28 1995-01-28 Torque wrench

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Publication Number Publication Date
EP0723839A1 true EP0723839A1 (en) 1996-07-31
EP0723839B1 EP0723839B1 (en) 2000-01-26

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ID=8003104

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Application Number Title Priority Date Filing Date
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EP (1) EP0723839B1 (en)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109421016A (en) * 2017-08-29 2019-03-05 京都机械工具株式会社 Locking tool
EP3587036A4 (en) * 2017-03-28 2020-03-04 Kyoto Tool Co., Ltd. Tightening tool
CN112556922A (en) * 2020-11-25 2021-03-26 中国航空工业集团公司北京长城计量测试技术研究所 Self-limiting bolt simulator

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19514882A1 (en) * 1995-04-22 1996-10-24 Werner Hermann Wera Werke Torque wrench or the like
US5537877A (en) * 1995-09-20 1996-07-23 Frank Hsu Torsion wrench with display unit for displaying torsion force limit thereon
GB9602565D0 (en) * 1996-02-08 1996-04-10 Britool Ltd Torque wrench
CN105022336A (en) * 2015-07-10 2015-11-04 成都力鑫科技有限公司 Screw mounting device capable of realizing precise quantitative control
CN112917426B (en) * 2021-01-27 2022-09-06 芜湖协航测控技术有限公司 Electronic force limiting method of digital display torque wrench

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EP0119928A1 (en) * 1983-03-17 1984-09-26 Facom Dynamometric tightening apparatus
EP0274575A2 (en) * 1987-01-16 1988-07-20 Consolidated Devices, Inc. Floating fulcrum for torque wrenches
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EP0490376A1 (en) * 1990-12-13 1992-06-17 Saltus-Werk Max Forst GmbH & Co. Torque wrench
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DE9311013U1 (en) * 1993-07-23 1993-09-02 Mercedes-Benz Aktiengesellschaft, 70327 Stuttgart Hand-held torque wrench

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Publication number Priority date Publication date Assignee Title
DE3139374A1 (en) * 1981-10-03 1983-04-14 Dr. Staiger, Mohilo + Co GmbH, 7060 Schorndorf Mechanical torque wrench (torque measurement outside the centre of application)
EP0119928A1 (en) * 1983-03-17 1984-09-26 Facom Dynamometric tightening apparatus
EP0274575A2 (en) * 1987-01-16 1988-07-20 Consolidated Devices, Inc. Floating fulcrum for torque wrenches
EP0360893A1 (en) * 1988-09-28 1990-04-04 Jomi Trust Company Limited Automatic release torque wrench
GB2231293A (en) * 1989-04-28 1990-11-14 Mhh Eng Co Ltd Torque-indicating wrench
EP0490376A1 (en) * 1990-12-13 1992-06-17 Saltus-Werk Max Forst GmbH & Co. Torque wrench
WO1992021483A1 (en) * 1991-06-06 1992-12-10 Schatz Gmbh Instrument for testing the quality of screwed connections
DE9311013U1 (en) * 1993-07-23 1993-09-02 Mercedes-Benz Aktiengesellschaft, 70327 Stuttgart Hand-held torque wrench

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3587036A4 (en) * 2017-03-28 2020-03-04 Kyoto Tool Co., Ltd. Tightening tool
CN109421016A (en) * 2017-08-29 2019-03-05 京都机械工具株式会社 Locking tool
US10994394B2 (en) 2017-08-29 2021-05-04 Kyoto Tool Co., Ltd. Tightening tool
CN112556922A (en) * 2020-11-25 2021-03-26 中国航空工业集团公司北京长城计量测试技术研究所 Self-limiting bolt simulator

Also Published As

Publication number Publication date
DE59507696D1 (en) 2000-03-02
DE29501355U1 (en) 1995-03-02
EP0723839B1 (en) 2000-01-26

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