EP0077346A1 - Torque wrench, with automatic releasing, pseudo-clutching and setting. - Google Patents

Torque wrench, with automatic releasing, pseudo-clutching and setting.

Info

Publication number
EP0077346A1
EP0077346A1 EP19820901132 EP82901132A EP0077346A1 EP 0077346 A1 EP0077346 A1 EP 0077346A1 EP 19820901132 EP19820901132 EP 19820901132 EP 82901132 A EP82901132 A EP 82901132A EP 0077346 A1 EP0077346 A1 EP 0077346A1
Authority
EP
European Patent Office
Prior art keywords
handle
cam
spring
rocker arm
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
EP19820901132
Other languages
German (de)
French (fr)
Other versions
EP0077346B1 (en
Inventor
Flavien Nordet
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT82901132T priority Critical patent/ATE22672T1/en
Publication of EP0077346A1 publication Critical patent/EP0077346A1/en
Application granted granted Critical
Publication of EP0077346B1 publication Critical patent/EP0077346B1/en
Expired legal-status Critical Current

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

  • the present invention relates to hand tools of the type "dynamometric wrenches" making it possible to provide bolting or screwing of mechanical assemblies to a recommended torque. This proceeds from the predetermined deformation of a spring. The amplitude of deformation of the spring, obtained with each stress, is constant. The torque variation effects are proportional to the length of spring subject to deformation after adjustment.
  • this body is pierced with a transverse lumen intended to receive the intermediate elements 11 for driving the screws and nuts. Adjoining this receptacle is fitted a hoop 9 which maintains the thickest end of the leaf spring 8 along the body 1, and the assembly is secured by a bolted axis.
  • the other end of the body receives a hollow pivoting handle 5 which partially fits in and envelops all the active elements of the key, cam 2 with its return spring, rocker arm 3 and damping block 4.
  • An adjusting screw (which can, if necessary, be made inviolable by existing means for carburetor jets for example) allows the tool to be recalibrated according to wear.
  • this reversible tool ensures both right tightening and left tightening. He is precise and faithful. Its construction is simple (reduced number of components and wide adjustment tolerances). His reduced head and slim body allow him the best access.
  • the leaf spring releases part of the accumulated force by pushing back the rocker arm through its point of contact with the roller, and its return effect is stopped at its free end by the block. damper.
  • the resulting shock constitutes the expected tactile and auditory signal.
  • the leaf spring supports a residual tension lower than the nominal torque displayed since its free length increased while its torsion decreased. Consequently, the body of the tool retains its angular position, while even carried away by its momentum, the operator's hand only accentuates the rotational movement of the handle.
  • This subsidiary effect is limited by the rise in tension of the leaf spring and, at the end of the stroke, by the contact of the safety stop with the body of the tool. It is during this period that the physiological reflex intervenes to interrupt the tightening action.

Landscapes

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

Abstract

L'invention concerne les outillages a main permettant le serrage de la boulonnerie mecanique a un couple determine. Elle procede de la deformation d'une lame de ressort de profit caracteristique (8). Elle revendique: la presence d'un dispositif de pseudo-debrayage de la poignee (5) par rapport au corps (1) de l'outil, l'elargissement de la gamme de valeurs de serrage, par l'adaptation de 3 jeux differents de l'ensemble constitue par la frette (9), le curseur (10) et la lame ressort (8), l'utilisation inconditionnelle dans le sens du desserrage, la presence d'une vis (7) de reglage et de correction d'usure. Ces dispositions constituent un progres appreciable dans la conception des cles dynamometriques commercialisees actuellement.The invention relates to hand tools for tightening the mechanical bolts to a determined torque. It proceeds from the deformation of a characteristic profit spring leaf (8). It claims: the presence of a pseudo-clutch device of the handle (5) relative to the body (1) of the tool, the widening of the range of tightening values, by the adaptation of 3 different games of the assembly constituted by the hoop (9), the cursor (10) and the leaf spring (8), the unconditional use in the direction of loosening, the presence of a screw (7) for adjusting and correcting d 'wear. These provisions constitute appreciable progress in the design of the dynamometric keys currently on the market.

Description

CLEDITE A COUPLE OU DYNAMOMETRIQUE TORQUE OR DYNAMOMETRIC CLEDITE
DECLENCHEMENT PSEUDO-DEBRAYAGE. ET REARMEENT AUTOMATIQUE'' La présente invention concerne les outils â main du type "clés dynamomètriques" permettant d'assurer le bouloimage ou le vissage d'ensembles mécaniques à un couple préconisé. Celle-ci procède de la déformation prédéterminée d'un ressort. L'amplitude de déformation du ressort, obtenue à chaque sollicitation, est constante. Les effets de variation du couple sont proportionnels, à la longueur de ressort soumise à déformation après réglage.PSEUDO-RELEASE TRIGGER. AND REARMEENT AUTOMATIQUE '' The present invention relates to hand tools of the type "dynamometric wrenches" making it possible to provide bolting or screwing of mechanical assemblies to a recommended torque. This proceeds from the predetermined deformation of a spring. The amplitude of deformation of the spring, obtained with each stress, is constant. The torque variation effects are proportional to the length of spring subject to deformation after adjustment.
D'une manière générale les outils connus de ce genre s'utilisent avec précaution, lentement, par approches successives, en guettant le signal ténu annonçant que la valeur de couple souhaitée est atteinte. Certains sont très imprécis. D'autres très complexes et de réalisation onéreuse sont fragiles. La plupart ne peuvent pas être employés au desserrage. Aucu ne peut être mêlé aux autres composants d'une caisse à outil sans être soigneusement protégé par un encombrant coffret. L'outil présenté se compose d'un corps 1 profilé, de faible section, gravé longitudinalement de trois échelles graduées, et parcouru par un curseur 10 immobilisàble â la demande par un bouton moleté.In general, known tools of this kind are used with caution, slowly, by successive approaches, watching for the tenuous signal announcing that the desired torque value has been reached. Some are very imprecise. Others, very complex and expensive, are fragile. Most cannot be used for loosening. None can be mixed with the other components of a tool box without being carefully protected by a bulky box. The tool presented consists of a profiled body 1, of small section, engraved longitudinally of three graduated scales, and traversed by a cursor 10 immobilizable on demand by a knurled button.
Une extrémité de ce corps est percécd'une lumière transversale appelée â recevoir les éléments intermédiaires 11 d'entraînement des vis et ëcrous. Jouxtant ce réceptacle est emboîtéeune frette 9 qui maintient l'extrémité la plus épaisse de la lame ressort 8 le long du corps 1, et l'ensemble est solidarisé par un axe boulonné. L'autre extrémité du corps reçoit une poignée 5 pivotante creuse qui l'emboîte partiellement et enveloppe tous les éléments actifs de la clé, came 2 avec son ressort de rappel, culbuteur 3 et bloc amortisseur 4.One end of this body is pierced with a transverse lumen intended to receive the intermediate elements 11 for driving the screws and nuts. Adjoining this receptacle is fitted a hoop 9 which maintains the thickest end of the leaf spring 8 along the body 1, and the assembly is secured by a bolted axis. The other end of the body receives a hollow pivoting handle 5 which partially fits in and envelops all the active elements of the key, cam 2 with its return spring, rocker arm 3 and damping block 4.
Cet outil pallie tous les inconvénients évoqués précédemment. En effet : ler) Il associe au système de réarmement automatique, un dispositif simple de pseudo-débrayage qui autorise en toute sécurité pour la main de l'opérateur (sans dérapages intempestifs) une plus grande vitesse de serrage en limitant largement le risque de dépasser le couple imposé. Ce perfectionnement apporte le double avantage appréciable de faire gagner du temps et de réduire la tension nerveuse de l'utilisateur.This tool overcomes all the drawbacks mentioned above. Indeed: 1st) It associates with the automatic rearming system, a simple pseudo-declutching device which allows in complete safety for the operator's hand (without untimely slippage) a higher tightening speed by largely limiting the risk of exceeding the imposed couple. This improvement brings the appreciable double advantage of saving time and reducing the nervous tension of the user.
2) Son signal de déclenchement exceptionnellement audible s'accompagne d'un message tactile caractéristique et sans équivoque.2) Its exceptionally audible trigger signal is accompanied by a characteristic and unequivocal tactile message.
3) Il emploie comme ressort récepteur une lame droite de grande Iongueur (la taille adoptée permet précision et longévité) de section rectan- pente calculée de telle sorte que l'échelonnement des graduations du vernier parcouruea par le curseur, soit plus proche d'une progression arithmétique, que celle obtenue en utilisant une lame dé section constante (représentation grapnique planche 2/2) d'où une plus grande précision de serrage dans la zone des fortes charges.3) It uses as a receiving spring a straight blade of great length (the size adopted allows precision and longevity) of rectan section slope calculated in such a way that the staggering of the vernier graduations traversed by the cursor is closer to an arithmetic progression than that obtained using a blade of constant section (graphical representation board 2/2) hence a more high clamping precision in the area of heavy loads.
4) Grâce l'amovibilité de trois de ses composants : la frette de fixation du ressort (9), le curseur (10), et la lame ressort (8) dont il convient de posséder un jeu d'épaisseurs différentes, il permet avec une seule monture kg d'assurer une très large gamme de valeurs de serrage (allant de 0, 200 à4) Thanks to the removability of three of its components: the spring fixing band (9), the slider (10), and the spring blade (8) of which it is advisable to have a set of different thicknesses, it allows with a single kg mount to ensure a very wide range of clamping values (from 0, 200 to
12Kg par exemple). 5) La robustesse éprouvée de son articulation poignée/corps lui permet d'assurer sans risque, le desserrage de la boulonnerie d'autant que les éléments dynamomètriques ne sont pas sollicités.12 kg for example). 5) The proven robustness of its handle / body articulation allows it to ensure without risk, the loosening of the bolts as much as the dynamometric elements are not stressed.
6) Son mécanisme entièrement protégé le met à l'abri des déréglages ou des détériorations, il peut être mêlé â d'autres outils sans précaution particulière et supporte sans dommage les chutes et les chocs.6) Its fully protected mechanism protects it from misadjustments or damage, it can be mixed with other tools without special precautions and withstands damage and impact without damage.
7) Une vis de réglage (pouvant, en cas de nécessité être rendue inviolable par les moyens existants pour les gicleurs de carburateurs par exemple) permet de réêtalonner l'outil en fonction de l'usure.7) An adjusting screw (which can, if necessary, be made inviolable by existing means for carburetor jets for example) allows the tool to be recalibrated according to wear.
Enfin, cet outil réversible assure aussi bien les serrages à droite que les serrages à gauche. Il est précis et fidèle. Sa construction est simple (nombre réduit de composants et larges tolérances d'ajustement). Sa tête réduite et son corps mince lui permettent le meilleur accès.Finally, this reversible tool ensures both right tightening and left tightening. He is precise and faithful. Its construction is simple (reduced number of components and wide adjustment tolerances). His reduced head and slim body allow him the best access.
Le dessin annexe montre l'aspect général (face et profil) de l'outil ainsi que le détail du mécanisme au repos. Cinématique :The accompanying drawing shows the general appearance (face and profile) of the tool as well as the detail of the mechanism at rest. Cinematic :
Quand l'outil est en position de travail et que l'utilisateur exerce une traction sur sa poignée 5, celle-ci pivote d'une faible amplitude autour de l'axe qui la rend solidaire du corps 1. Se faisant, elle entraîne le culbuteur 3 qui, repoussé à une extrémité par le bec de la came 2, calée dans le corps 1, déforme la lame ressort 8 en l'éloignant du corps de l'ou- til au point de contact du galet de friction dont il est muni â l'autre extrémité. Ce mouvement a aussi pour effet d'éloigner de quelques millimètres du bloc amortisseur 4, l'extrémité libre de la lame de ressort. Quand le couple sélectionné par 1e- curseur 10 est atteint, le culbuteur échappe au bec de la came.When the tool is in the working position and the user exerts traction on its handle 5, the latter pivots by a small amplitude around the axis which makes it integral with the body 1. In doing so, it causes the rocker arm 3 which, pushed at one end by the spout of the cam 2, wedged in the body 1, deforms the leaf spring 8 by moving it away from the body of the tool at the point of contact of the friction roller of which it is fitted at the other end. This movement also has the effect of moving a few millimeters away from the damper block 4, the free end of the spring leaf. When the torque selected by the slider 10 is reached, the rocker arm escapes the spout of the cam.
Simultanément, la lame ressort libère une partie de l'effort accumulé en repoussant le culbuteur par son point de contact avec le galet, et son effetde retourest stoppé au niveau de son extrêmité libre par le bloc amortisseur. Le choc qui en résulte constitue le signal tactile et auditif attendu. A ce stade la lame ressort supporte une tension résiduelle inférieure au couple nominal affiché puisque sa longueur libre augmentait alors que sa torsion diminuait. En conséquence, le corps de l'outil conserve sa position angulaire, alors que même emportée par son élan, la main de l'opérateur ne fait qu'accentuer le mouvement de rotation de la poignée. Cet effet subsidiaire est limité par la remontée en tension de la lame ressort et, en fin de course, par le contact de la butée de sécurité avec le corps de l'outil. C'est durant cette période que le reflex physiologique intervient pour interrompre l'action de serrage.Simultaneously, the leaf spring releases part of the accumulated force by pushing back the rocker arm through its point of contact with the roller, and its return effect is stopped at its free end by the block. damper. The resulting shock constitutes the expected tactile and auditory signal. At this stage the leaf spring supports a residual tension lower than the nominal torque displayed since its free length increased while its torsion decreased. Consequently, the body of the tool retains its angular position, while even carried away by its momentum, the operator's hand only accentuates the rotational movement of the handle. This subsidiary effect is limited by the rise in tension of the leaf spring and, at the end of the stroke, by the contact of the safety stop with the body of the tool. It is during this period that the physiological reflex intervenes to interrupt the tightening action.
La poignée relâchée est alors repoussée à sa position de départ par la réaction de l'extrémité libre de la lame ressort sur le bloc amortisseur. Dans le même temps le culbuteur maintenu lui aussi par elle^en position ini-i tiale, efface au passage le bec de la came, qui coulissant dans sa boutonnière,comprime son ressort de rappel et revient finalement saillir sous son plan de contact avec le culbuteur.The released handle is then pushed back to its starting position by the reaction of the free end of the leaf spring on the damping block. At the same time the rocker arm also held by it ^ in initial position, clears the passage the spout of the cam, which slides in its buttonhole, compresses its return spring and finally comes back to protrude under its plane of contact with the rocker.
En conclusion, l'idée directrice de l'étude qui précède a été devul gariser, en simplifiant sa construction etscπutilisation, en élargissant ses possibilités, un outil à main encore mal connu et peu employé, rendu de plus en plus nécessaire par l'évolution de la technique en construction mécanique. In conclusion, the guiding idea of the foregoing study has been devul garquer, by simplifying its construction and use, by expanding its possibilities, a hand tool still little known and little used, made more and more necessary by evolution of technique in mechanical engineering.

Claims

R EVE NDICATIONSR EVE NDICATIONS
1 - Clé dynamomètrique à main, à déclenchement et rearmement automatiques, réversible, permettant serrage et desserrage de la boulonnerie mécanique avec ou sans effet de dosage du couple de serrage, caractérisée par le fait qu ' ell comporte un dispositif de pseudo-débrayage de la poignée de manoeuvre après le déclenchement, constitué :1 - Hand-held torque wrench, with automatic triggering and rearming, reversible, allowing tightening and loosening of the mechanical bolts with or without a torque tightening effect, characterized in that it includes a pseudo-disengaging device for the operating handle after triggering, consisting of:
- d 'une came 2 solidaire du corps 1 de l 'outil, réglable en position par la vis 7 et escamotable par coulissement dans sa boutonnière centrale lors du retour de la poignée 5 en position de repos.- a cam 2 secured to the body 1 of the tool, adjustable in position by the screw 7 and retractable by sliding in its central buttonhole when the handle 5 returns to the rest position.
- d 'un culbuteur 3 qui tourillonne sur un axe solidaire de la poignée 5. 0ette dernière en pivotant lors de l 'opération de serrage, entraîne le culbuteur 3, qui, retenu à une extré mité par le bec de la came 2 repousse par le galet serti dans son extrémité opposée, la lame ressort en un point situé environ aux k/5 de sa longueur, Jusqu 'à ce que le contact du culbuteur 3 avec le bec de came 2 s 'interrompe par échappement du culbuteur qui cesse de ce fait sa contrainte sur la lame ressort 8. Celle-ci libérée repousse le culbuteur 3 et vient buter de son extrémité libre sur le bloc amortisseur 4 (constitué d ' un bloc d'acier, solidaire de la poignée 5 en son extrémité postérieure par l 'intermédiaire dé bagues de caout chouc) . La libération de la lame ressort 8 constitue le pseudo-débrayage revendiqué. Le choc de son extrémité libre avec le bloc amortisseur 4 concrétise le signal tactile et sonore de déclenchement de la cié avertissant l 'opérateur. Celui-ci relâchant sa traction sur la poignée 5, la tension résiduell de la lame ressort 8 la ramène à la position de repos illustrée par la planche 1/2.- a rocker arm 3 which pivots on an axis integral with the handle 5. The latter, pivoting during the tightening operation, drives the rocker arm 3, which, retained at one end by the spout of the cam 2 repels by the roller crimped in its opposite end, the blade comes out at a point located approximately at k / 5 of its length, until the contact of the rocker arm 3 with the cam spout 2 is interrupted by escape of the rocker arm which ceases to this makes its constraint on the spring blade 8. This released pushes back the rocker arm 3 and abuts its free end on the damping block 4 (consisting of a steel block, integral with the handle 5 at its rear end by through the rubber rings). The release of the leaf spring 8 constitutes the claimed pseudo-clutch. The impact of its free end with the shock absorber block 4 gives concrete form to the operator's tactile and audible trigger signal. The latter releasing its traction on the handle 5, the residual tension of the spring blade 8 brings it back to the rest position illustrated by the plate 1/2.
2 - Clé dynamomètrique, selon la revendication 1 caractérisée en ce qu ' elle est équipée d'un ressort récepteur d' ef fort constitué d 'une lame élastique 8 droite, de section rec tangulaire, de largeur constante mais d' épaisseur dégressive permettant un meilleur échelonnement des graduations.2 - Torque wrench according to claim 1 characterized in that it is equipped with a strong ef receiving spring consisting of an elastic blade 8 straight, of rec tangular section, of constant width but of decreasing thickness allowing a better scaling of graduations.
3 - Clé dynamomètrique selon la revendication 2 caractérisée en ce que la lame ressort 8 et les deux pièces connexes 9 et 10 étant amovibles, elle permet avec une seule monture dont le vernier est gravé de 3 échelles parallèles et deux autres jeux différents de pièces 8, 9 et 10 amovibles, de couvrir une large gamme de performances.3 - Torque wrench according to claim 2 characterized in that the leaf spring 8 and the two related parts 9 and 10 being removable, it allows with a single mount whose vernier is engraved with 3 parallel scales and two other different sets of parts 8 , 9 and 10 removable, to cover a wide range of performance.
4 - Clé dynamomètrique suivant l 'une des revendications précédentes caractérisée en ce qu ' elle est équipée d 'une vis de réglage 7 avec écrou de blocage traversant le corps 1 à l 'aplomb de l ' extrémité de la. came 2 opposée au bec. La tran lation engendrée par la rotation à gauche ou à droite de la vis de réglage 7 fait varier la hauteur du bec de la came 2 permettant l ' étalonnage des lames ressort 8 en fonction des graduations du corps 1 , et le réétalonnags ultérieur de la clé en fonction de l 'usure. 4 - Torque wrench according to one of the preceding claims, characterized in that it is equipped with an adjustment screw 7 with locking nut passing through the body 1 directly above the end of the. cam 2 opposite the spout. The tran lation generated by the rotation to the left or to the right of the adjusting screw 7 varies the height of the spout of the cam 2 allowing the calibration of the spring blades 8 according to the graduations of the body 1, and the subsequent recalibration of the key according to wear.
EP19820901132 1981-04-27 1982-04-27 Torque wrench, with automatic releasing, pseudo-clutching and setting Expired EP0077346B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82901132T ATE22672T1 (en) 1981-04-27 1982-04-27 SO-CALLED TORQUE OR DYNAMOMETRIC WRENCH WITH AUTOMATIC SHUTDOWN, PSEUDO DISENGAGEMENT AND RE-ENGAGEMENT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8108506A FR2504436A1 (en) 1981-04-27 1981-04-27 KEY SAID WITH "TORQUE OR DYNAMOMETRIC, WITH TRIGGER, PSEUDO-CLUTCH, AND AUTOMATIC RESET"
FR8108506 1981-04-27

Publications (2)

Publication Number Publication Date
EP0077346A1 true EP0077346A1 (en) 1983-04-27
EP0077346B1 EP0077346B1 (en) 1986-10-08

Family

ID=9257881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820901132 Expired EP0077346B1 (en) 1981-04-27 1982-04-27 Torque wrench, with automatic releasing, pseudo-clutching and setting

Country Status (4)

Country Link
EP (1) EP0077346B1 (en)
DE (1) DE3273614D1 (en)
FR (1) FR2504436A1 (en)
WO (1) WO1982003816A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730943B1 (en) * 1995-02-24 1997-05-23 Facom DYNAMOMETRIC KEY WITH AUTOMATIC RESET

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1234972A (en) * 1958-10-17 1960-07-01 Torque wrench
FR1510105A (en) * 1966-12-06 1968-01-19 Forges Stephanoises Sa Des Automatic reset trigger for torque wrench
US3847038A (en) * 1971-07-26 1974-11-12 Snap On Tools Corp Automatic release wrench of the preset type
FR2250308A7 (en) * 1973-07-05 1975-05-30 Wille Eduard

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8203816A1 *

Also Published As

Publication number Publication date
EP0077346B1 (en) 1986-10-08
FR2504436A1 (en) 1982-10-29
FR2504436B1 (en) 1984-07-13
DE3273614D1 (en) 1986-11-13
WO1982003816A1 (en) 1982-11-11

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