EP2756924B1 - Justierung eines Drehmomentschlüssels - Google Patents

Justierung eines Drehmomentschlüssels Download PDF

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Publication number
EP2756924B1
EP2756924B1 EP13198489.0A EP13198489A EP2756924B1 EP 2756924 B1 EP2756924 B1 EP 2756924B1 EP 13198489 A EP13198489 A EP 13198489A EP 2756924 B1 EP2756924 B1 EP 2756924B1
Authority
EP
European Patent Office
Prior art keywords
spindle
handle
adjusting ring
torque wrench
shaft
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.)
Active
Application number
EP13198489.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2756924A2 (de
EP2756924A3 (de
Inventor
Thomas Beyert
Patrick Klatt
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.)
Filing date
Publication date
Application filed by Hazet Werk Hermann Zerver GmbH and Co KG filed Critical Hazet Werk Hermann Zerver GmbH and Co KG
Publication of EP2756924A2 publication Critical patent/EP2756924A2/de
Publication of EP2756924A3 publication Critical patent/EP2756924A3/de
Application granted granted Critical
Publication of EP2756924B1 publication Critical patent/EP2756924B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B25B23/1427—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 present invention relates to a torque wrench according to the features in the preamble of claim 1.
  • a torque wrench having these features is disclosed in, for example, US Patent No. 5,383,247 DE 20 2011 050887 U1 disclosed.
  • Torque wrenches are used to tighten screw connections with a predetermined torque.
  • screw for example, wheel nuts of a motor vehicle or even long screws for coupling a cylinder head on an internal combustion engine, which must be tightened with a predetermined torque, on the one hand at a low tightening torque, an independent release and the other at too high tightening torque to avoid damage to the screw or adjacent components.
  • a torque wrench has a handle at a free end to be operated by an applying fitter, and at the opposite end thereof a ratchet head that quickly modifies a torque wrench for a particular bolted connection by inserting sockets or nuts.
  • torque wrenches usually have a trigger mechanism, consisting of a prestressable spring and a triggering lever, wherein the biasing force of the spring is adjustable by a rotation of the handle on the shaft of a torque wrench. If the torque wrench is then used for tightening a screw connection and the screw connection reaches the set triggering torque, then the lever strikes against an inside of the housing and gives a haptic and / or acoustic feedback to the user using the triggering torque.
  • torque wrenches For the production of torque wrenches, however, it is first necessary that the individual parts of the torque wrench be made separately from each other and then assembled.
  • the so completed torque wrench first requires a pre-setting and then a fine adjustment of the adjustable torque, so that in later use operation a user fitter by turning the handle when setting a triggering torque, which is displayed for example on the handle with a scale, can make sure that the set torque corresponds to the desired triggering torque value.
  • Object of the present invention is therefore, starting from the prior art, to simplify the Feinjustleitersdorfkeit a torque wrench and to produce such a torque wrench cheaper.
  • the torque wrench according to the invention for tightening or loosening a screw connection has a shank and a handle disposed at one end of the shank, wherein on the opposite end of the handle a receptacle for a positive screw connection can be coupled, which in particular a ratchet head with square for receiving a Socket can be.
  • a relative rotation of the handle relative to the shaft biased by a spring triggering mechanism is arranged, with which a release torque is adjustable, wherein the trigger mechanism has a spindle which is positively coupled to the handle and the trigger mechanism is pre-adjustable.
  • the torque wrench is characterized in that an adjusting ring is provided at a free end of the handle and the adjusting ring is coupled to the spindle via a positive engagement, wherein for performing the adjustment of the adjusting ring in the axial direction on the spindle is displaceable, so that the handle is no longer in rotationally fixed engagement with the spindle, wherein by turning the adjusting ring, the spindle is movable.
  • the adjustment process thus means a first pre-adjustment or readjustment in the production of the torque wrench as well as a readjustment already taking place during the use of the torque wrench.
  • an adjustment process is to be understood as meaning that the triggering mechanism is finely adjusted in such a way that a respective relative rotation of the Handle made setting a release torque also corresponds to the torque applied to the screw.
  • the present invention provides two different ways to make a positive connection between the handle and spindle, and thus also for releasing the positive connection between the handle and spindle before.
  • the positive connection between the handle and spindle is caused by a direct and thus direct interlocking of the handle and spindle.
  • the adjusting ring is also positively interlocked with the spindle and / or with the handle.
  • it is therefore necessary that the interlocking toothing between the handle and spindle is released, which according to the invention by an axial displacement of the handle relative to the spindle, so that the toothing between the handle and spindle is no longer in positive engagement.
  • the handle is thus freely rotatable without causing a rotational movement of the spindle drive.
  • the present invention now provides that the adjusting ring is still positively engaged with the spindle and the desired torque is adjusted by turning the adjusting ring and concomitant rotation of the spindle. If the desired torque of the pre-adjustment is set, the handle is aligned with the existing on the torque wrench display and brought by axial displacement in positive engagement with the teeth.
  • a lock nut which is arranged at the end of the spindle, now accidental or unwanted axial movement of the handle relative to the spindle is avoided.
  • the handle is always relatively rotatable relative to the spindle.
  • a non-rotatable connection between Handle and spindle are produced indirectly via the adjusting ring.
  • the adjusting ring is positively and rotationally coupled to the spindle and in turn has a toothing possibility, which is positively engageable with the handle.
  • the present invention is further characterized in that the handle is coupled via a positive connection with the spindle, wherein the handle in particular a mecanicalfachkantENS, preferably a hexagon socket, and the mecanicalfachkanttagen form-fitting in a corresponding Budapestiolofachkanteducation, more preferably an external hex, the spindle engages or receives this.
  • the manufacturing cost of the torque tool can be significantly reduced, with no additional components in the form of splints or the like for producing the twist-proof coupling of the handle and spindle are necessary. Rather, it is possible to couple the handle and the spindle by simple, interlocking nesting together.
  • the spindle is preferably formed in one piece and of uniform material.
  • the handle is coupled by a lock nut at the end of the spindle.
  • the lock nut is then not listed on the spindle or released from the spindle and then the handle at least so far moved back in the axial direction that the positive engagement between the Mehrfachkantthetic of the spindle and handle no longer exists.
  • the handle can thus be rotated relative to the spindle. Consequently, a rotation of the handle does not cause any movement of the spindle.
  • the spindle can then be pre-adjusted independently of the handle and thereby performs a tensioning or relaxing movement of the spring.
  • a torque value is set, which is then adjusted by turning the handle also on the display of the handle and by further axial displacement of the handle relative to the spindle such that the handle and spindle come into positive engagement, so determined that now a pre-adjustment or Fine adjustment has taken place.
  • This may be an initial setting in the production of the torque wrench itself or else a readjustment after intensive use or in maintenance intervals of the torque wrench.
  • the pre-adjustment is carried out in the context of the invention on the Justierring, wherein in the Vorjust istsposition the Justierring with the spindle is in positive engagement.
  • the adjusting ring is therefore preferably coupled positively and non-rotatably with the spindle.
  • the invention provides that the adjusting ring is then still in positive engagement with the spindle when the handle is no longer in positive engagement with the spindle.
  • a rotation of the adjusting ring then leads to a process of the spindle and thus to a clamping movement of the spring, wherein this is done independently of the handle.
  • the spindle has an external toothing in particular in the region of the adjusting ring and the adjusting ring itself has a corresponding internal toothing, wherein the adjusting ring and the spindle are axially displaceable, but nevertheless non-rotatable in the Are engaged.
  • the teeth are an external hexagon and a corresponding hexagon socket.
  • the positive engagement of the Justierrings in the normal position of use and the optional positive coupling of Justierring and handle in the context of the invention again has the advantage that in the normal use position resulting from the rotation of the handle force to drive and process the spindle for a over the positive engagement between the handle and spindle, on the other hand, but also on the positive engagement between the adjusting ring and spindle is transferred from the hand of the applying mechanic to the spindle.
  • the spindle is movable relative to the shaft, a spindle nut is provided in the shaft end, which is fixedly and positively coupled to the shaft end.
  • a rotation of the spindle in the spindle nut thus leads to a relative movement of the spindle relative to the shaft in the axial direction, wherein in the shaft itself, in turn, a spring is provided which is stretched or relaxed due to the movement of the spindle.
  • the adjusting ring preferably has tooth-like extensions oriented in the axial direction, which can be brought into corresponding recesses of the handle for engagement. In the normal use position, therefore, if the handle and / or the adjusting ring are not in the position for pre-adjustment, thus adjusting ring and handle are in positive engagement. If now the handle, but also the adjusting ring brought into the Vorjustierposition, and the positive connection between the handle and adjusting ring is released. This allows in particular the independent adjustment of the position of the spindle and the position of the handle with corresponding display of the set torque.
  • the adjusting ring in the invention at its free end at least one recess, wherein in the recess a rotating about the longitudinal axis of the spindle adjusting tool can be coupled.
  • it is a mechanical adjustment tool, so that in an at least partially automated production of the torque wrench, the adjustment tool can be coupled to the alignment ring and a process in the axial direction of the spindle is performed by rotation.
  • the adjusting ring and / or the handle are pushed in the axial direction to the shaft and coupled by a lock nut on the spindle.
  • a closure cap is then particularly preferably incorporated into the adjusting ring itself, which on the one hand prevents the ingress of dirt. Furthermore, it is possible to make a readjustment by removing the cap relative to the adjusting ring and loosening the lock nut.
  • the adjusting ring itself is thus accessible from the outside. It is not necessary to disassemble the torque wrenches largely or completely to make an adjustment in the context of the invention, which is particularly advantageous in a Nachjustiervorgang.
  • the adjusting ring itself is furthermore particularly preferably designed such that it can be reached by hand and can also be adjusted by manual intervention. Thus, inevitably no special adjustment tool or a motor drive an adjustment tool is necessary to make in particular a readjustment of the torque wrench.
  • the adjusting ring therefore at its free end on a grip option, for example, according to the principle of a wing nut.
  • the adjusting ring further has such a receptacle for an adjusting tool, in particular a motor-driven adjusting tool, so that the torque wrench over this at least partially mechanized or can be automatically adjusted.
  • a suspension loop is integrally formed on the handle and / or the adjusting ring and uniform material, with which it is possible to hang the torque wrench on a tool wall or the like when not in use. Due to the solid, positive connection of both handle as well as adjusting ring with the shaft and thus the torque wrench, the entire torque wrench can be hung when not in use.
  • a wrist strap or safety line it is possible within the scope of the invention to guide through the suspension loop a wrist strap or safety line, so that here, for example, a fall protection is given, so that the user fitter who accidentally slip the torque wrench from his hand, prevents this on the Floor hits.
  • a fall protection is given, so that the user fitter who accidentally slip the torque wrench from his hand, prevents this on the Floor hits.
  • the torque wrench may be hung, for example, on a wire rope with return spring, so that it is easily accessible to a user fitter and in turn can be easily moved out of the field.
  • FIG. 1 shows a torque wrench 1 according to the invention in a plan view. Shown are a shaft 2 and arranged at the end of the shaft 2 handle 3. The handle 3 is rotatable about the central longitudinal axis 4 of the shaft 2 and is thereby moved in the axial direction A. In this case, a release mechanism, not shown, is biased within the shaft 2 such that a desired release torque is adjustable. The respective torque value can be read on a display 5. So now a pre-adjustment or fine adjustment of the set Torque can be performed, according to the invention at the handle end 6 an adjusting ring 7 is arranged.
  • FIGS. 2a and b each have a longitudinal sectional view along the central longitudinal axis 4 of the torque wrench 1 of FIG. 1 shows.
  • FIG. 2a First, a use position is shown.
  • the handle 3 itself is arranged relatively rotatable about the central longitudinal axis 4 of the shaft 2. So that no unwanted adjustment is carried out according to the desired set release torque, a latching mechanism 8 is provided, by means of which the handle 3 and the shaft 2 are positively fixed to one another.
  • a spindle nut 10 is fixed in position on the shaft end 9 in the shaft 2. This is illustrated by two cylindrical pins or grub screws 11.
  • a spindle 12 which is displaceable in the axial direction A by rotational movement, is mounted.
  • the spindle 12 itself is positively and rotatably coupled to the handle 3 via a spindle 12 provided on the outer hexagon 13 and a corresponding hexagon socket 14 in the handle 3 with each other.
  • a lock nut 16 is provided at the spindle end 15, which prevents axial displacement of the handle 3 relative to the spindle 12.
  • the external hexagon 13 is hereby alternatively designed to be axially displaceable on the spindle 12 as a nut. It is thus possible, an indirect coupling between the handle 3 and spindle 12 via the adjusting ring 7, in particular on the in FIGS. 3a and 3b shown teeth 20 and recesses 21 to produce. It is thus set the distance in the axial direction A by turning the hexagon socket 13 as a nut relative to the spindle 12 and then the spindle 12 is indirectly rotatably coupled via the adjusting ring 7 with the handle 3.
  • the spindle 12 undergoes a rotational movement, on the other hand, the spindle 12 is moved in the axial direction A.
  • a spindle head 17 then biases a spring, not shown, and sets a desired release torque over it.
  • the positive coupling between the handle 3 and spindle 12 is detachable, the spindle 12 is pre-adjustable or finely adjusted and then the coupling between the handle 3 and spindle 12 again fixed is.
  • the pre-adjustment process is in FIG. 2b shown.
  • the lock nut 16 is released and the handle 3 in the axial direction A on the spindle 12 on the image plane relative pushed to the right.
  • the external hex 13 is therefore no longer in positive engagement with the hexagon socket 14.
  • the handle 3 is thus freely rotatable in this position in this position relative to the shaft 2, without causing a rotational movement or movement of the spindle 12.
  • the adjusting ring 7 is positively coupled with an internal toothing 18 and against rotation to an external toothing 19.
  • a rotational movement of the adjusting ring 7 it is thus possible to cause a rotational movement of the spindle 12, regardless of the handle position.
  • a possible positive engagement between adjusting ring 7 and handle 3 is negligible at this point. If, however, a positive interlocking of adjusting ring 7 and handle 3 be provided here, it would still be possible, the adjusting ring 7, in FIG.
  • the handle 3 When this setting of the release torque is made, the handle 3 is moved to the desired position of the in FIG. 1 rotated display 5 so that the torque value displayed on the display 5 with the set triggering torque the trigger mechanism not shown matches. Then adjusting ring 7 and handle 3 in the axial direction A, based on the image plane to the left, moved and connected by means of the lock nut 16 fixed to the spindle 12.
  • FIG. 3a and b show this structure again in a perspective exploded view. Shown are the loosened from the spindle end 15 lock nut 16 and each pulled apart in the axial direction A components. Good to see the internal teeth 18 of the adjusting ring 7, which is axially movable in the assembled state with the external teeth 19 of the spindle 12 can be brought into positive engagement. Also clearly visible is the internal double hexagon 14 of the handle 3, which can be brought into engagement with the external hexagon 13 of the spindle 12 in the normal position.
  • FIG. 3b illustrated that a recess 22 is provided, wherein in the recess 22 in the axial direction A an adjusting tool can be inserted and by performing a rotational movement of the adjusting ring 7 is rotatable.
  • the adjusting ring 7 is not fixed to a mere ring shape, but is also designed as at least partially cylindrical body which can be inserted into a hollow handle end 6.
  • the adjusting ring 7 further has an open surface with internal teeth 24 at its end, in which a cap, not shown, can be inserted.
  • FIG. 1 and 2a a hanging loop 23 on the adjusting ring 7, which is material-uniform and integrally connected thereto to hang the torque wrench 1 when not in use at this.
  • the handle 3 and / or the adjusting ring 7 are preferably made of a plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP13198489.0A 2013-01-21 2013-12-19 Justierung eines Drehmomentschlüssels Active EP2756924B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202013100263.1U DE202013100263U1 (de) 2013-01-21 2013-01-21 Justierung eines Drehmomentschlüssels

Publications (3)

Publication Number Publication Date
EP2756924A2 EP2756924A2 (de) 2014-07-23
EP2756924A3 EP2756924A3 (de) 2018-04-04
EP2756924B1 true EP2756924B1 (de) 2019-04-24

Family

ID=49920020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13198489.0A Active EP2756924B1 (de) 2013-01-21 2013-12-19 Justierung eines Drehmomentschlüssels

Country Status (4)

Country Link
EP (1) EP2756924B1 (zh)
CN (1) CN103934788B (zh)
DE (1) DE202013100263U1 (zh)
ES (1) ES2730206T3 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110695922B (zh) * 2019-11-11 2024-09-20 中国民用航空飞行学院 一种精密零件上的空心定位销拆卸用作业工装
TWI769831B (zh) * 2021-05-26 2022-07-01 和嘉興精密股份有限公司 扭力結構
CN113612044B (zh) * 2021-09-06 2024-07-02 国网江苏省电力有限公司常州供电分公司 一种接地棒扭矩限制装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4655104A (en) * 1986-01-06 1987-04-07 Ryeson Corporation Adjustable torque wrench
US5497682A (en) * 1995-07-10 1996-03-12 Hsu; Frank Torsion wrench
CN2538495Y (zh) * 2002-01-08 2003-03-05 谢智庆 扭力扳手
DE202006003274U1 (de) 2006-02-28 2006-04-27 Hazet-Werk Hermann Zerver Gmbh & Co. Kg Drehmomentschlüssel
DE202006006350U1 (de) * 2006-04-19 2006-08-31 Lee, Chang Chuan, Caotun Drehmomentschlüssel mit Positionierung
US7836781B1 (en) * 2009-05-03 2010-11-23 Mikawa Co., Ltd. Torque-setting device
ES2402236T3 (es) * 2009-05-07 2013-04-30 Mikawa Co., Ltd. Dispositivo de ajuste de par de torsión
US8245606B2 (en) * 2009-11-16 2012-08-21 William Tools Co., Ltd. Adjustable torque wrench having lock device
US8141463B2 (en) * 2010-01-28 2012-03-27 Jin-Tsai Lai Hand tool for adjusting torsion
DE202010002176U1 (de) * 2010-02-08 2010-04-22 Lai, Jin-Tsai Handwerkzeug mit einstellbarem Drehmoment
DE202010003273U1 (de) * 2010-03-05 2010-06-02 Hazet-Werk Hermann Zerver Gmbh & Co. Kg Drehmomentwerkzeug
DE202010011064U1 (de) * 2010-08-05 2010-10-21 Hazet-Werk Hermann Zerver Gmbh & Co. Kg Drehbare Anzeige eines Drehmomentschlüssels
DE202011050887U1 (de) * 2011-08-03 2011-09-07 Hazet-Werk Hermann Zerver Gmbh & Co. Kg Drehmomentwerkzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN103934788B (zh) 2017-03-01
DE202013100263U1 (de) 2014-04-24
EP2756924A2 (de) 2014-07-23
CN103934788A (zh) 2014-07-23
ES2730206T3 (es) 2019-11-08
EP2756924A3 (de) 2018-04-04

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