WO2002070208A1 - Cle dynamometrique - Google Patents

Cle dynamometrique Download PDF

Info

Publication number
WO2002070208A1
WO2002070208A1 PCT/GB2002/000912 GB0200912W WO02070208A1 WO 2002070208 A1 WO2002070208 A1 WO 2002070208A1 GB 0200912 W GB0200912 W GB 0200912W WO 02070208 A1 WO02070208 A1 WO 02070208A1
Authority
WO
WIPO (PCT)
Prior art keywords
torque
handle
head
roller
break
Prior art date
Application number
PCT/GB2002/000912
Other languages
English (en)
Inventor
Steven Lawson
John Bazeley
Original Assignee
Norbar Torque Tools Limited
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 Norbar Torque Tools Limited filed Critical Norbar Torque Tools Limited
Publication of WO2002070208A1 publication Critical patent/WO2002070208A1/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

Definitions

  • This invention relates to an improved construction of torque wrench
  • this invention relates to the "break" mechanism used to signal
  • a torque wrench comprising
  • adjustment means to set the torque at which said torque sensing means actuates, said sensing means being responsive to the force applied to the handle to actuate a torque sensing mechanism to provide a signal at the break point when the set torque is attained, and wherein the sensing means responds to provide said signal and thereafter produces an increasing resistance to the force applied through the handle whilst maintaining or reducing the torque applied to the drive head thereby permitting further movement of the handle through displacement of the torque sensing mechanism but without increasing the torque applied to the head.
  • a torque wrench comprising:
  • sensing means responsive to the force applied to the handle to activate the break mechanism
  • the sensing means comprises a coacting cam and roller, the cam profile being arranged such on nearing or reaching the break point the roller is displaced along the cam profile permitting further movement of the handle through displacement of the break mechanism but without increasing the torque applied to the head.
  • break mechanism and "break point” but it is to be understood that a mechanical break through movement is not essential.
  • a mechanism which snaps or provides a tactile or other signal to a user would function equally well and is to be considered as included within the scope of this invention.
  • the feature of this invention is the arrangement whereby the continued application of force is subject to a mechanism which ensures that the torque applied to the tool head does not increase.
  • Fig. 1 shows a torque wrench, in part sectional view, incorporating the break mechanism of this invention and before actuation of the mechanism;
  • Fig. 2 shows the wrench of Fig. 1 after actuation of the break mechanism
  • Fig. 3 shows a detail of the break mechanism before actuation of the mechanism
  • Fig. 4 shows a detail of the coacting cam and roller
  • Fig. 5a shows an off-screen trace of force (Y-axis) against time (X-
  • Fig. 5b shows a similar trace, as in Fig. 5a, but of a torque wrench incorporating the break mechanism of this invention.
  • a torque wrench has a drive head 1 , for example including a ratchet and square drive spigot, which is connected to one end of a lever arm 2.
  • the other end of the arm 2 is connected through a break mechanism 3 with a handle 4 through which torque is applied to the drive head 1.
  • the break mechanism has two links 5 and 6 connected through respective pivots 5a and 6a with the lever arm 2 and through pivots 5b and 6b with the handle 4.
  • the projection of each line through the pivots of each link converge towards the drive head 1 and the respective lines intersect at the centre of rotation of the drive head. This configuration ensures that the break point at the set torque does not vary in dependence on the exact point at which the force is applied to the handle 4.
  • the links 5 and 6 are connected together through a brace 7 attached to each link by a pivot 7a and 7b.
  • a lever arm 8 is connected with the link 5 through a pivot 8a and supports a cam follower 9 being a roller mounted on arm 8 through an axle. The roller engages a profile 7c, in the nature of a detent, on the facing surface of the brace 7.
  • links 5 and 6 and handle 4 all lie symmetrically about the longitudinal axis of the wrench, with the roller 9 lying in the detent 7c.
  • the end of the lever arm 8 remote from the pivot 8a has a roller 8b which abuts the end of plunger 10.
  • Plunger 10 is supported within the handle 4 and is urged into engagement with the roller 8b by spring mechanism 11 which can be adjusted as to the force applied to the end of the arm 8.
  • spring 11 via plunger 10, roller 8b and arm 8 maintains the roller 9 in the detent 7c the whole assembly being rigid.
  • the former shows an actual example of the time related applied torque of a prior art torque wrench and up to the point A
  • Fig 5b shows a similar plot to that of Fig. 5a but with the break mechanism of this invention. As seen the break occurs at A and the torque thereafter reduces as the roller 9 moves from the profile 7c to the point B. During this motion the operator has time to relieve the force applied as the handle 4 is moving to the position of Fig. 2 gradually against significant spring force without the sudden break.
  • the wrench according to this invention uses the instantaneous centres principle which permits the wrench to be non-length dependent and to be held

Landscapes

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

Abstract

L'invention concerne une clé dynamométrique comprenant une tête d'entraînement (1), un bras de levier (2), un mécanisme de rupture détectant un couple (5,6,7,8) et une poignée (4) équipée de moyens (11) de réglage du couple auquel le mécanisme fonctionne. Les moyens de détection (7,8) comprennent une came de coaction (7c) et un rouleau (9), le profil de came (7c, 7d) étant disposé de manière que lorsque le couple réglé est atteint, le rouleau (9) est déplacé le long du profil de came (7c, 7d), permettant ainsi un mouvement ultérieur de la poignée (4) par l'intermédiaire d'un déplacement du mécanisme de rupture (7,8) sans augmentation du couple appliqué à la tête (1) via la poignée (4).
PCT/GB2002/000912 2001-03-06 2002-03-01 Cle dynamometrique WO2002070208A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0105486.5 2001-03-06
GB0105486A GB0105486D0 (en) 2001-03-06 2001-03-06 Improvements in torque wrenches

Publications (1)

Publication Number Publication Date
WO2002070208A1 true WO2002070208A1 (fr) 2002-09-12

Family

ID=9910060

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/000912 WO2002070208A1 (fr) 2001-03-06 2002-03-01 Cle dynamometrique

Country Status (2)

Country Link
GB (1) GB0105486D0 (fr)
WO (1) WO2002070208A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2477625A (en) * 2010-02-04 2011-08-10 Boeing Co Virtual concentric manual torque wrench with off-axis compensation
US9855643B2 (en) 2015-01-20 2018-01-02 The Boeing Company Torque-wrench apparatuses and methods of assembling the same
US10427281B2 (en) 2016-02-15 2019-10-01 The Boeing Company Dynamic off-axis torque wrench compensation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1028544A (fr) * 1950-11-29 1953-05-26 Perfectionnements aux clés de serrage à limiteur d'effort, dénommées aussi clés dynamométriques
FR1034602A (fr) * 1950-10-04 1953-07-28 Facom Manufacture Francaise De Clé dynamométrique
DE919999C (de) * 1943-12-14 1954-11-11 Messerschmitt Boelkow Blohm Drehmomentenschluessel
DE925458C (de) * 1943-09-17 1955-03-21 Herbert Suin De Boutemard Drehmoment-Werkzeug
US3964351A (en) * 1974-08-07 1976-06-22 Tonichi Manufacturing Co., Ltd. Torque wrench
FR2584330A1 (fr) * 1985-07-02 1987-01-09 Renault Ets G Nouvelle cle de serrage dynamometrique du type a elements deformants de flexion

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE925458C (de) * 1943-09-17 1955-03-21 Herbert Suin De Boutemard Drehmoment-Werkzeug
DE919999C (de) * 1943-12-14 1954-11-11 Messerschmitt Boelkow Blohm Drehmomentenschluessel
FR1034602A (fr) * 1950-10-04 1953-07-28 Facom Manufacture Francaise De Clé dynamométrique
FR1028544A (fr) * 1950-11-29 1953-05-26 Perfectionnements aux clés de serrage à limiteur d'effort, dénommées aussi clés dynamométriques
US3964351A (en) * 1974-08-07 1976-06-22 Tonichi Manufacturing Co., Ltd. Torque wrench
FR2584330A1 (fr) * 1985-07-02 1987-01-09 Renault Ets G Nouvelle cle de serrage dynamometrique du type a elements deformants de flexion

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2477625A (en) * 2010-02-04 2011-08-10 Boeing Co Virtual concentric manual torque wrench with off-axis compensation
GB2477625B (en) * 2010-02-04 2012-08-29 Boeing Co Virtual concentric manual torque wrench with off-axis compensation
US8806993B2 (en) 2010-02-04 2014-08-19 The Boeing Company Torque wrench
US9855643B2 (en) 2015-01-20 2018-01-02 The Boeing Company Torque-wrench apparatuses and methods of assembling the same
US10427281B2 (en) 2016-02-15 2019-10-01 The Boeing Company Dynamic off-axis torque wrench compensation

Also Published As

Publication number Publication date
GB0105486D0 (en) 2001-04-25

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