WO1999042252A1 - Cle dynamometrique pour serrer a bloc un element filete avec un couple de rotation determine - Google Patents

Cle dynamometrique pour serrer a bloc un element filete avec un couple de rotation determine Download PDF

Info

Publication number
WO1999042252A1
WO1999042252A1 PCT/EP1999/000182 EP9900182W WO9942252A1 WO 1999042252 A1 WO1999042252 A1 WO 1999042252A1 EP 9900182 W EP9900182 W EP 9900182W WO 9942252 A1 WO9942252 A1 WO 9942252A1
Authority
WO
WIPO (PCT)
Prior art keywords
key body
stop
torque
torque wrench
grip
Prior art date
Application number
PCT/EP1999/000182
Other languages
German (de)
English (en)
Inventor
Gerhard Michler
André Übele
Stefan WÖRZ
Original Assignee
Fritz Schunk Gmbh & 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 Fritz Schunk Gmbh & Co. Kg filed Critical Fritz Schunk Gmbh & Co. Kg
Priority to EP99903632A priority Critical patent/EP1056569A1/fr
Priority to AU24213/99A priority patent/AU2421399A/en
Publication of WO1999042252A1 publication Critical patent/WO1999042252A1/fr

Links

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
    • 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
    • B25B23/141—Mechanical overload release couplings

Definitions

  • Torque wrench for tightening a threaded element with a defined torque
  • the present invention relates to a torque wrench for tightening a threaded element with a defined torque, with a key body which carries at its one axial end a coupling element for connection to the threaded element to be screwed down and at its other axial end a handle element for rotating the key body.
  • Torque wrenches of this type are known and are used to tighten screws, threaded bolts or the like with a defined tightening torque and in this way to connect two components with a defined clamping force.
  • a friction clutch is usually provided between the key body and the handle element, which can transmit a specific, maximum torque from the handle element to the key body and slips when this maximum torque is exceeded.
  • REPLACEMENT BLUE (RULE 26) complicated in construction and therefore expensive.
  • the object of the invention is therefore to provide a torque wrench of the type mentioned, which is simple in construction and inexpensive to manufacture.
  • the handle element about the key body axis is rotatably and axially displaceably held on the key body, wherein it is pressed axially by an elastic element against a stop provided on the key body, so that a torque from the handle element to the stop and thus the key body can be transmitted, and that the contacting contact areas on the grip element and stop are designed and cooperate in such a way that when a threaded element is screwed on, a relative rotational movement of the grip element relative to the stop to an axial movement of the grip element on the key body against the spring force of the elastic element leads.
  • the grip element leads a relative to the stop Rotational movement, which brings about an axial movement of the grip element against the spring force of the elastic element due to the positive guidance formed by the contact areas. If the elastic element is formed, for example, by a plate spring assembly, this is compressed by the axial movement of the handle element, with the result that its clamping force and thus also the torque which can be transmitted from the handle element to the key body is increased.
  • a rotation of the handle element relative to the key body causes a change in the maximum transmissible torque, the transmissible torque corresponding to the respective relative angular position between these two components being exactly determined.
  • the torque wrench according to the invention is first connected to the threaded bolt via its coupling element, so that the key body axis and the threaded element axis are aligned.
  • the torque wrench is then rotated via the handle element, which assumes an initial position with respect to the key body, in which only a comparatively low torque can be transmitted from the handle element to the key body, as a result of which the threaded bolt is screwed into the threaded bore.
  • a threaded element with the desired tightening torque can be screwed tight with the torque wrench according to the invention, the torque wrench being simple in design, since only the contact areas on the grip element and stop need be designed accordingly.
  • a control curve can be provided on one of the two components, for example in the form of an inclined surface, which cooperates with a control edge on the other component.
  • the torque wrench according to the invention is thus simple and inexpensive to manufacture.
  • the contact areas on the handle element and stop which cooperate in each case to bring about an axial movement of the handle element are designed in such a way that they come into contact flatly. This results in a low surface pressure.
  • the contact areas can be designed to be complementary to one another.
  • the contact areas have an inclination which changes in the circumferential direction with respect to the key body axis.
  • the size of the torque transferable from the handle element to the key body changes not only with the biasing force of the elastic element, but also from the respective angle of inclination, so that there is no linear relationship between the rotation of the handle element relative to the key body and the size of the transferable Torque exists.
  • This configuration opens up the possibility of establishing a progressive or degressive relationship between the angular path of the grip element and the increase in the transmissible torque, in that the inclination of the contact areas becomes correspondingly steeper or flatter.
  • a plurality of contact areas are provided on the handle element distributed over the circumference of the key body, which simultaneously engage with corresponding contact areas on the stop, so that a torque is distributed evenly over the circumference from the handle element to the stop becomes.
  • two diametrically opposed contact areas can be provided on the grip element, which simultaneously engage corresponding contact areas at the stop.
  • the axial end of the key body opposite the coupling element is designed as a pin onto which the elastic element and the grip element are pushed, the arrangement of the grip element / elastic element by the stop which is at the free end attached to the pin, in particular welded to the pin or screwed onto the pin, is tensioned against a shoulder of the key body.
  • FIG. 1 shows a front view of an embodiment of a torque wrench according to the invention in its starting position
  • FIG. 2 shows the torque wrench from FIG. 1 with indicated inner contours
  • FIG. 3a shows the torque wrench from FIG. 1 with the handle element rotated
  • FIG. 3b shows the forces which occur at the contact areas between the grip element and the stop of the torque wrench from FIG. 3a
  • FIG. 4 the torque wrench from FIG. 3 with indicated inner contours
  • FIG. 5 shows the torque wrench from FIG. 1 with an attached panel
  • Figure 6 is a perspective view of the stop of a torque wrench according to the invention with the contact areas and provided
  • FIG. 7 shows a part of a grip element with contact areas provided thereon.
  • a torque wrench 1 which is intended for tightening threaded bolts etc. with a defined torque.
  • the torque wrench 1 has a cylindrical key body 2, which carries at its one axial end a coupling element 3 in the form of an inner square for connection to the threaded element to be screwed down and at its other axial end a handle element 4 for rotating the key body 2.
  • the grip element 4 is axially displaceable on a pin 5 of the key body 2 and rotatable about the key body axis X and is supported by a plate spring assembly 6 previously pushed onto the pin 5, which bears against a shoulder 2a of the key body 2.
  • a stop 7 is screwed onto the free end of the pin 5 so that the grip element 4 is braced with the plate spring assembly 6 and thus the grip element under the pretensioning force of the plate spring assembly 6 against the Stop 7 is pressed. This creates a frictional connection between the grip element 4 and the stop 7, by means of which a torque of a certain size can be transmitted from the grip element 4 to the stop 7 and thus to the key body 2.
  • the contact areas 8, 9 that come into contact with one another on the grip element 4 and stop 7 are designed to be complementary to one another, so that they come into abutment against one another in each case and thus the surface pressure between the components 4, 7 is low, and they act in the manner of run-up slopes in this way together that when screwing a threaded element a relative rotational movement of the grip element 4 with respect to the stop 7 leads to an axial movement of the grip element from the starting position shown in FIG. 1 away from the stop 7, whereby the plate spring assembly 6 is compressed, as indicated in FIG. 3a.
  • This has the consequence that the spring force F F , with which the handle element 4 is pressed against the stop 7, increases, so that a greater torque can be transmitted from the handle element 4 to the stop 7 and thus the key body 2.
  • FIGS. 1, 3 and 3a the forces acting between the grip element 4 and the stop 7 are shown.
  • the spring force with which the gripping element 4 is pressed against the stop 7 by the plate spring assembly 6 is denoted by F r .
  • This spring force F r can be divided into a component F ra which is perpendicular to the press nip and a component F rp which extends in the direction of the press nip. From the normal to the press The force component F FN standing in the gap can be determined via the friction coefficient between the grip element 4 and the stop 7, the friction force F R acting in the press gap, which counteracts a relative movement between the grip element 4 and the stop 7.
  • a torque M is introduced into the grip element 4, this results in a force F M directed perpendicular to the spring force F r in the press nip, which force can also be divided into a component F MN directed perpendicular to the press nip and a component F HS directed parallel to the press nip.
  • This force component F MN is opposed to the frictional force F "and the spring force component F rs with the result that the grip element 4 begins to rotate relative to the stop 7 on the pin 5 when the force component F MN becomes greater than the sum of the Frictional force F R and the spring force component F FS acting in the direction of the press nip.
  • the handle element 4 then rotates until the spring force F r has increased to such an extent that the axial movement of the handle element 4, which is inevitably associated with the rotary movement, increases that the forces acting in the press nip plane are in equilibrium.
  • the magnitude of the torque which can be transmitted at most via the frictional engagement between the grip element 4 and the stop 7, depends on the spring force F r with which the grip element 4 is pressed against the stop 7, and the mean Radius and the inclination of the contact areas 8, 9 coming into contact with one another with respect to the key body axis X.
  • Each relative angle of rotation position between the grip element 4 and the stop 7 corresponds to a spring force F F and the inclination of the contact areas 8, 9 coming into contact with one another on the grip element 4 and stop 7 exactly defined, maximum transferable torque.
  • the relative angle of rotation position between the grip element 4 and the stop 7 and thus the maximum transferable torque M can be read, for example, using a scale 11 provided on the stop 7 and the grip element 4 or a cover 10 connected to the grip element 4, as shown in FIG 5 is shown.
  • the torque wrench 1 To screw, for example, a threaded bolt into a threaded bore, the torque wrench 1 according to the invention is first connected to the threaded bolt via its coupling element 3, so that the key body axis X and the threaded element axis are aligned with one another. Then the torque Key 1 via the grip element 4, which, relative to the key body 1, assumes the starting position shown in FIG. 1, in which the contact area sections 8a, 8c of the grip element 4 and stop 7 engage with one another and only a comparatively low torque from the grip element 4 onto the key body 2 can be transferred, rotated, whereby the threaded bolt is screwed into the threaded bore.
  • contact area sections 8c, 9c are formed on the threaded element 4 and stop 7, which are used to release the cooperate with each other and for this purpose have a corresponding inclination, which is opposite to the inclination of the contact area sections 8a, 9a, which cooperate with each other for tightening the threaded element.
  • the contact areas 8, 9 are each formed center symmetrically, so that the contact area sections 8a, 9a; 8c, 9c, for example, can be used both for tightening a right-hand thread element and for loosening a left-hand thread element.

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

Abstract

Clé dynamométrique pour serrer à bloc un élément fileté avec un couple de rotation déterminé, comprenant un corps de clé (2) portant, à l'une de ses extrémités axiales, un élément d'accouplement (3) assurant la liaison avec l'élément fileté à serrer à bloc et, à son autre extrémité axiale, un élément de préhension (4) permettant la rotation du corps de clé (2), caractérisée en ce que l'élément de préhension (4) est monté mobile en rotation autour de l'axe (X) du corps de clé et déplaçable axialement sur le dit corps de clé (2), et en ce qu'il est pressé axialement, par l'intermédiaire d'un élément élastique (6), à l'encontre d'une butée (7) prévue sur le corps de clé (2), de telle façon qu'un couple de rotation puisse être transmis de l'élément de préhension (4) à la butée (7) et, par conséquent, au corps de clé (7).
PCT/EP1999/000182 1998-02-18 1999-01-14 Cle dynamometrique pour serrer a bloc un element filete avec un couple de rotation determine WO1999042252A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99903632A EP1056569A1 (fr) 1998-02-18 1999-01-14 Cle dynamometrique pour serrer a bloc un element filete avec un couple de rotation determine
AU24213/99A AU2421399A (en) 1998-02-18 1999-01-14 Dynamometric key for tightening a threaded element with a defined torque

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29802767.4 1998-02-18
DE29802767U DE29802767U1 (de) 1998-02-18 1998-02-18 Drehmomentschlüssel zum Festziehen eines Gewindeelements mit einem definierten Drehmoment

Publications (1)

Publication Number Publication Date
WO1999042252A1 true WO1999042252A1 (fr) 1999-08-26

Family

ID=8052826

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/000182 WO1999042252A1 (fr) 1998-02-18 1999-01-14 Cle dynamometrique pour serrer a bloc un element filete avec un couple de rotation determine

Country Status (4)

Country Link
EP (1) EP1056569A1 (fr)
AU (1) AU2421399A (fr)
DE (1) DE29802767U1 (fr)
WO (1) WO1999042252A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2390793A1 (es) * 2010-02-04 2012-11-16 Administrador De Infraestructuras Ferroviarias (Adif) Llave de apriete manual controlado
WO2019005665A1 (fr) * 2017-06-30 2019-01-03 A&E Advanced Closure Systems, Llc Tournevis et procédé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR652350A (fr) * 1928-04-07 1929-03-07 Clef et dispositif de serrage
US2576069A (en) * 1947-12-04 1951-11-20 Hoag Wilton Folsom Torque-limiting wrench
FR2063259A5 (fr) * 1969-09-08 1971-07-09 Johannes
US3876369A (en) * 1973-08-06 1975-04-08 Alvin J Behrens Torque wrench

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE703769C (de) * 1937-02-09 1941-03-15 Kleinbongartz & Kaiser Schraubenschluessel mit Mitteln gegen die UEberlastung der Mutter
GB1462759A (en) * 1973-10-10 1977-01-26 Neil Holdings Ltd James Torque wrenches
DD247170A1 (de) * 1986-03-13 1987-07-01 Polygraph Leipzig Einrichtung zum einstellen einer drehmomentbegrenzung an einem schraubendreher

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR652350A (fr) * 1928-04-07 1929-03-07 Clef et dispositif de serrage
US2576069A (en) * 1947-12-04 1951-11-20 Hoag Wilton Folsom Torque-limiting wrench
FR2063259A5 (fr) * 1969-09-08 1971-07-09 Johannes
US3876369A (en) * 1973-08-06 1975-04-08 Alvin J Behrens Torque wrench

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2390793A1 (es) * 2010-02-04 2012-11-16 Administrador De Infraestructuras Ferroviarias (Adif) Llave de apriete manual controlado
WO2019005665A1 (fr) * 2017-06-30 2019-01-03 A&E Advanced Closure Systems, Llc Tournevis et procédé
US10660687B2 (en) 2017-06-30 2020-05-26 A&E Advanced Closure Systems, Llc Driver tool and method

Also Published As

Publication number Publication date
AU2421399A (en) 1999-09-06
EP1056569A1 (fr) 2000-12-06
DE29802767U1 (de) 1998-04-09

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