EP1649980B1 - Torque limiting tool - Google Patents

Torque limiting tool Download PDF

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Publication number
EP1649980B1
EP1649980B1 EP20050292187 EP05292187A EP1649980B1 EP 1649980 B1 EP1649980 B1 EP 1649980B1 EP 20050292187 EP20050292187 EP 20050292187 EP 05292187 A EP05292187 A EP 05292187A EP 1649980 B1 EP1649980 B1 EP 1649980B1
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EP
European Patent Office
Prior art keywords
tool according
driven
torque
drive
receiving
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.)
Not-in-force
Application number
EP20050292187
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German (de)
French (fr)
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EP1649980A1 (en
Inventor
Jacques Gautier
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Individual
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Individual
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Publication of EP1649980A1 publication Critical patent/EP1649980A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/08—Handle constructions with provision for storing tool elements
    • B25G1/085—Handle constructions with provision for storing tool elements for screwdrivers, wrenches or spanners
    • 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
    • B25B15/00—Screwdrivers
    • 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
    • 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 hand-screwing tools for precisely limiting the tightening torque according to the preamble of claim 1.
  • Such a tool is known from the document US 5,746,298 A .
  • Screwing means the rotational drive of an assembly element which is provided with a thread, such as a bolt, a nut, a screw itself, or any other assembly part.
  • the torque limiting screwing tools that have been proposed up to now typically include a torque head whose maximum torque is determined by an adjustment made directly on the dynamometric head.
  • the main aim is to propose, according to the invention, a torque limiting clamping tool which is of increased reliability and reduced cost.
  • the retaining means comprises for this purpose an arrangement forming internal lateral support of the receiving housing, which arrangement is at least partially resilient to deviate laterally from said torque threshold.
  • the bearing arrangement is constituted by a flexible blade U-shaped, the two branches form, by their inner face, each a support vis-à-vis the workpiece to rotate.
  • the driving body and the U-shaped elastic element are then advantageously associated in mutual sliding so that the part to be driven in rotation cooperates with a portion of the U-shaped elastic element which is more or less close to its base in function. the sliding position of the U-shaped element relative to the main body.
  • the driving body advantageously has means allowing a placement of the U-shaped elastic element in a plane coinciding with that of a main axis of the workpiece to rotate.
  • the lateral support arrangement consists of a bar with a substantially circular section.
  • the elastic element may also be constituted by a Belleville washer.
  • the tool comprises a ring receiving the part to be rotated and placed between the latter and the lateral bearing element, which ring has a non-circular outer contour.
  • the driving body may also have two central part receiving housings to rotate, which, when equipped with their respective elastic element, have different internal dimensions, so that the part to be rotated to one of the housing can not be received in the other dwelling.
  • the part receiving housings to be rotated are advantageously placed on opposite sides of the main body.
  • the tool may also have a plurality of receiving housings of parts to be rotated respectively in the storage position of each piece to rotate in question.
  • the tool may have two gripping portions extending radially diametrically opposite.
  • a gripping means extending radially from the driving body is advantageously removably mounted on the main body.
  • the training body of the figure 1 is in the form of a cylindrical body provided with an inner cavity 10.
  • This inner cavity 10 is divided into three main housing.
  • a central housing 11 has a substantially circular contour, of diameter equivalent to that of a nozzle 20 to be housed there.
  • Each lateral housing 12 and 13 are arranged in lateral communication with the central housing 11. These two Lateral housings 12 and 13 each extend in the form of a rectilinear and intersecting chamber 14 to the central housing 11 and further in the form of an outer bending 16, 17 extending away from the central housing 11. In other words, each lateral housing 12 and 13 forms both a rectilinear and lateral chamber 14, 15 to the central housing 11, and forms both a direct and radial extension in the form of the bending.
  • each lateral housing receives a blade 34, 35 coming to marry the rectilinear chamber 14, 15 and secant to the central housing.
  • the two blades 34 and 35 are therefore positioned laterally and parallel to the central housing 11. In this position, each of the blades 34, 35 intersects the central housing 11 on the edge thereof, thereby defining the width of the latter. this.
  • the central housing 11 is therefore equipped with two rectilinear lateral edges vis-à-vis.
  • the outer bending 16, 17 of each lateral housing 12, 13 then discovers a central portion of the associated blade 34, 35, which nevertheless remains held in position at its ends.
  • the hexagonal tip 20 is positioned between the two blades 34 and 35 within the central housing 11 of the drive body 10.
  • the width between the faces of this hexagonal tip 20 being equal to the spacing between the blades, the tip 20 matches the width of the central housing 11 limited by the blades 34 and 35.
  • the blades 34 and 35 have sufficient rigidity to form a firm lateral support.
  • the tip 20 is rotated simultaneously with the driving body 10 in the manner of a strict interlocking between two rigid elements.
  • each of the two blades 34 and 35 is free to flex in spacing in the presence of an excessive radial bearing force from the tip 20. This situation is shown in FIG. figure 3 .
  • the deflection is maximum when the edge 21 reaches the center of the blade 34, 35.
  • the blade 34, 35 then occupies the bending 16, 17 of the lateral housing considered 12, 13. Its ends retract in turn in the rectilinear chamber associated 14, 15.
  • each blade 34, 35 gives rise to a separation in rotation between the driving body 10 and the end piece 20, preventing the torque applied by the user to be transmitted on the end-piece. beyond a certain torque value.
  • the bending phenomenon of the blade therefore limits the value of the torque that is transmitted on the tip.
  • the blades 34, 35 are chosen with a flexural stiffness which is such that this bending phenomenon appears for a chosen tightening torque.
  • the bending stiffness is obtained by a suitable choice of the material constituting the blade and / or by a selected thickness thereof.
  • the maximum torque transmitted corresponds to the arrival of each blade 34, 35 in maximum flexion. This situation also corresponds the immobilization in rotation of the tip 20 and the screw element with which it is associated.
  • the resistance of the blade 34, 35 to the crossing by the edge 21 also falls tribological properties of the blade, that is to say, its surface state.
  • the surface state of each blade 34, 35 will be selected as rough as it is desired a significant opposition to the crossing of the blade.
  • the user typically continues its rotational movement, causing a crossing of the blade 34, 35 by the edge 21 having previously repelled.
  • the edge continues to slide on the blade 34, 35 beyond the center of the blade. This second part of the sliding corresponds to a return to position of the blade 34, 35 so that the user feels only a slight opposition to the rotation.
  • the tip 20 is then in the situation of the figure 2 , that is to say in complementary association with the slides 34, 35 at rest.
  • the device is therefore automatically operational for subsequent tightening.
  • This device has a symmetrical clamping behavior in a step to the right and in a step to the left, with the same torque limitation without manipulation or adjustment. It allows loosening and / or retightening at the required torque in both directions.
  • the tip here shown with a hexagonal section may be a square section nozzle or a tip having lateral flats.
  • the straight blades 34, 35 may be replaced by a blade of different shape.
  • the blade 36 proposed at figure 4 has a central corrugation 37 which is ideally placed in elevation towards the tip 20. This central corrugation 37 forms a slight obstacle against the crossing of the edge 21, thus increasing the maximum torque.
  • This central ripple 37 is felt by the user, thereby signaling the attainment of maximum torque.
  • this corrugation 37 When placed at a distance from the endpiece 20, this corrugation 37 on the contrary reduces the value of the torque transmitted when the edge 21 reaches the central position of the blade 36, reducing the value of the maximum torque applied.
  • such a blade 36 is more easily bent towards the direction in which the ripple rises than in the opposite direction of bending.
  • a clamping tool using such a reversible blade 36 allows the clamping of two elements for which is prescribed a different maximum torque.
  • the blade is replaced respectively by a flexible bar 38 of circular section and / or by a Belleville washer 39, that is to say by a non-flat washer and preferably conical or curved.
  • the Belleville washer 39 is placed in elevation towards the end piece 20 or in outward elevation, depending on the value of the maximum desired torque.
  • the element represented in figure 7 is a ring 40 of which a central passage 41 is chosen specifically complementary to a screwdriver bit 20.
  • This central passage 41 is here hexagonal.
  • the outer contour 42 of this ring 40 is specifically non-circular. It has two bosses 44 and 45 diametrically opposed while the rest of the contour 42 is circular.
  • This ring 40 is advantageously placed inside a driving body 10 such as that which has just been described with reference to the Figures 1 to 3 .
  • the spacing between the blades 34 and 35 is then equal to the diameter of the outer contour 42 of the ring 40 in its circular running portion.
  • the bosses 44 and 45 come to bear against each of the two lateral blades 34 and 35, blocking the mutual rotation between drive body 10 and crown 40.
  • bosses 44 and 45 push the blades 34 and 35 when the maximum permitted torque is reached.
  • Each boss 44, 45 then crosses a blade 34, 35 which it flexes in spacing.
  • This variant allows the user to choose between different maximum torques. Indeed, several crowns of the same type as the crown 40 are provided to the user, with bosses 44, 45 of different radial extent. The more the bosses 44, 45 are of pronounced extent, and the greater the torque necessary for the deflection of the blades 34, 35 is important.
  • the different crowns are advantageously marked with the value of the maximum torque that they produce.
  • the device comprises only one elastic element.
  • One of the two lateral housings 12, 13 of the Figures 1 to 3 is then replaced by a solid wall, the dimensions of the central housing 11 being widened to allow a slight lateral shift of the tip 20 to the deflection of the single blade.
  • a same elastic member 50 may have two faces 51 and 52 vis-à-vis one another.
  • the elastic organ of the figures 5 and 6 has the shape of a U.
  • the U-shaped elastic member extends in a plane which is transverse to the main direction of the endpiece 20, and whose branches constitute the bearing faces 51, 52 in the direction of the endpiece 20.
  • This elastic U-shaped member 50 is positioned in the driving body 10 by providing a longitudinal freedom of sliding of the elastic member in the driving body.
  • rectilinear housing 14 and 15 of Figures 1 to 3 are extended until reaching the periphery of the drive body 10.
  • the base of the U-shape of the elastic element then covers a portion of the periphery of the driving body 10 while the free ends 53, 54 of the U-shaped member protrude in part diametrically opposite the driving body 10.
  • the free ends 53, 54 of the U-shaped member advantageously have corrugations 55, 56 in outer protuberance. These corrugations 55, 56 form stop elements preventing an output of the member 50 from the drive body 10 by a too pronounced sliding.
  • the U-shaped member allows adjustment of the maximum torque delivered.
  • the endpiece 20 cooperates with a running part of the branches 51, 52 of the U.
  • This running part has a flexural strength which is similar to that of two independent blades. such as those described with reference to Figures 1 to 3 ..
  • the endpiece 20 cooperates with a part of the branches 51 and 52 which is close to the base of the U.
  • This part of the branches 51, 52 is particularly rigid since subjected to a mutual approximation force which is produced by the rigidity of the base of the U.
  • the driving body 10 has means for positioning the elastic member 50 in a position such that its U-shaped is in the same plane as the main axis of the tip 20 .
  • the tip 20 then cooperates with the ends 53, 54 of the branches of the U.
  • the maximum torque allowed is then particularly low.
  • end corrugations 55, 56 of the limbs 51, 52 are advantageously protruding towards the inside of the U-shape, for a substantially rectilinear contact with the endpiece 20.
  • the driving body 10 advantageously allows both transverse and aligned positioning of the U-shaped elastic member, for a varied choice of the value of the maximum torque delivered.
  • the tightening wrench shown in figure 10 also has a drive body 10 of cylindrical shape.
  • This driving body is extended laterally by a handle 60.
  • This handle is provided with two longitudinal housings 61 and 62 each receiving a tip 20, 25.
  • Each of these housings 61, 62 has a width complementary to that of the hexagonal shape of the considered endpiece 20, 25.
  • the upper housing 61 has a width of diameter equal to 9.2 mm, for a tip 20 type TX 50 .
  • the lower housing 62 has a width of 7.4 mm for receiving a tip type TX20.
  • each of these tips 20, 25 being provided with a head type "awl" of smaller diameter.
  • the driving body 10 itself has two opposite faces 18, 19 each of which is provided with a central receiving housing 11a, 11b of receiving tip.
  • Each of these housings 11a and 11b has a structure substantially in accordance with that described above with reference to the Figures 1 to 3 .
  • these two housings 11a and 11b are different, the housing 11a of the face 18 being provided for the reception of the tip 20 TX type 50 while the housing 11b of the face 19 is provided for the reception of the tip type TX 20.
  • Each of these housings 11a and 11b is furthermore provided with elastic elements of different stiffnesses, so that the maximum torque intended for the tip 20 of the TX 50 type is greater than the maximum torque intended for the tip 25 of the TX 20 type. .
  • the present clamping wrench thus allows a different action on two types of clamping.
  • the tip 25 TX type 20 can cooperate with the housing for the tip 20 type TX 50, because it pivots without restraint.
  • the tip 20 of the TX 50 type can not penetrate into the housing intended for the tip 25 of the TX 20 type.
  • This drive body 10 with two housings 11a and 11b thus also plays the role of polarizer between the end pieces. 20 and 25 to use.
  • the device has a driving body 10 similar to that which has just been described with reference to the Figures 10 and 11 .
  • the handle is however split into two parts 63 and 64 diametrically opposed.
  • Each of these two parts 63 and 64 here has a single respective housing 61 and 62 for storing an associated endpiece.
  • the key to figure 12 has the advantage of clamping by simultaneous action on each of the two diametrically opposite parts 63 and 64, for clamping in the manner of a nut "butterfly".
  • the variant of the figure 13 consists of the combination of a driving body 10 similar to that described with reference to Figures 10 and 11 with a gripping member 65 which is specifically removable.
  • the driving body 10 is provided for it with a transverse passage 65 located at mid-height which receives a clamping rod 66 which is removable in sliding.
  • the clamping rod 66 extends transversely to the driving body 10 and then forms the gripping element.
  • Such a removable assembly makes it possible to position the driving body 10 on the element to be screwed, and then, only subsequently, to place the clamping rod 66 in the driving body 10.
  • the present invention and in particular the embodiments described above and comprising a plurality of housings intended to deliver different couples makes it possible to solve, in particular, the problem posed by motor vehicle tunnel bolts and nuts which must respect couples precisely. different clamping.
  • the screwed part has a head, possibly hexagonal or square, which is placed in the receiving housing 11 in the same way as the tip 20 described above.
  • the head of the screwed element is separated from the driving body 10 and left in place. It is released if need of its possible additional crown 40.
  • the driving body 10, here manually driven, can also be driven by a rotating machine.

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

Description

L'invention concerne les outils de vissage à la main permettant de limiter avec précision le couple de vissage selon le préambule de la revendication 1. Un tel outil est connu du document US 5 746 298 A .The invention relates to hand-screwing tools for precisely limiting the tightening torque according to the preamble of claim 1. Such a tool is known from the document US 5,746,298 A .

On entend par vissage l'entraînement en rotation d'un élément d'assemblage qui est muni d'un pas de vis, tel qu'un boulon, un écrou, une vis elle-même, ou tout autre pièce d'assemblage.Screwing means the rotational drive of an assembly element which is provided with a thread, such as a bolt, a nut, a screw itself, or any other assembly part.

Les outils de vissage à limitation de couple qui ont été proposés jusqu'à présent comportent typiquement une tête dynamométrique dont le couple maximal est déterminé par un réglage effectué directement sur la tête dynamométrique.The torque limiting screwing tools that have been proposed up to now typically include a torque head whose maximum torque is determined by an adjustment made directly on the dynamometric head.

Ce réglage est une étape fastidieuse et donc coûteuse. La possibilité de réglage est en outre une source d'erreurs. En effet, une clé réglée à un couple de serrage élevé peut être acheminée par erreur jusqu'à un client nécessitant au contraire un serrage faible.This setting is a tedious and therefore expensive step. The possibility of adjustment is also a source of errors. Indeed, a key set to a high tightening torque can be routed by mistake to a customer requiring, on the contrary, a low tightening.

La possibilité de réglage permet en outre de modifier le couple maximal a posteriori. Un utilisateur en seconde main ne peut donc savoir si la clé en question a fait l'objet ou non d'une modification de son couple maximal.The possibility of adjustment also makes it possible to modify the maximum torque a posteriori. A second-hand user can not know if the key in question has been subject or not a change in its maximum torque.

Ces outils sont donc coûteux et peu fiables.These tools are therefore expensive and unreliable.

On vise essentiellement à proposer, selon l'invention, un outil de serrage à limitation de couple qui soit d'une fiabilité accrue et d'un coût réduit.The main aim is to propose, according to the invention, a torque limiting clamping tool which is of increased reliability and reduced cost.

On propose pour cela selon l'invention un outil de vissage selon la revendication indépendante 1.For this purpose, a screwing tool according to the independent claim 1 is proposed according to the invention.

Le moyen de retenue comprend à cet effet un aménagement formant appui latéral interne du logement de réception, lequel aménagement est au moins partiellement élastique pour s'écarter latéralement à partir dudit seuil de couple.The retaining means comprises for this purpose an arrangement forming internal lateral support of the receiving housing, which arrangement is at least partially resilient to deviate laterally from said torque threshold.

Selon une variante privilégiée, l'aménagement d'appui est constitué par une lame flexible en forme de U, dont les deux branches forment, par leur face interne, chacune un appui vis-à-vis de la pièce à entraîner en rotation.According to a preferred embodiment, the bearing arrangement is constituted by a flexible blade U-shaped, the two branches form, by their inner face, each a support vis-à-vis the workpiece to rotate.

Le corps d'entraînement et l'élément élastique en U sont alors avantageusement associés en coulissement mutuel de sorte que la pièce à entraîner en rotation coopère avec une partie de l'élément élastique en U qui est plus ou moins rapprochée de sa base en fonction de la position en coulissement de l'élément en U par rapport au corps principal.The driving body and the U-shaped elastic element are then advantageously associated in mutual sliding so that the part to be driven in rotation cooperates with a portion of the U-shaped elastic element which is more or less close to its base in function. the sliding position of the U-shaped element relative to the main body.

Le corps d'entraînement présente avantageusement des moyens autorisant un placement de l'élément élastique en U dans un plan confondu avec celui d'un axe principal de la pièce à entraîner en rotation.The driving body advantageously has means allowing a placement of the U-shaped elastic element in a plane coinciding with that of a main axis of the workpiece to rotate.

Selon une variante, l'aménagement d'appui latéral est constitué d'une barrette à section sensiblement circulaire.According to one variant, the lateral support arrangement consists of a bar with a substantially circular section.

L'élément élastique peut aussi être constitué par une rondelle Belleville.The elastic element may also be constituted by a Belleville washer.

Selon un aspect avantageux, l'outil comprend une couronne recevant la pièce à entraîner en rotation et placée entre ce dernier et l'élément d'appui latéral, laquelle couronne présente un contour externe non circulaire.According to an advantageous aspect, the tool comprises a ring receiving the part to be rotated and placed between the latter and the lateral bearing element, which ring has a non-circular outer contour.

Le corps d'entraînement peut aussi présenter deux logements centraux de réception de pièce à entraîner en rotation qui, lorsque équipés de leur élément élastique respectif, présentent des dimensions internes différentes, de sorte que la pièce à entraîner en rotation destinée à l'un des logements ne peut être reçue dans l'autre logement.The driving body may also have two central part receiving housings to rotate, which, when equipped with their respective elastic element, have different internal dimensions, so that the part to be rotated to one of the housing can not be received in the other dwelling.

Les logements de réception de pièce à entraîner en rotation sont avantageusement placés sur des faces opposées du corps principal.The part receiving housings to be rotated are advantageously placed on opposite sides of the main body.

L'outil peut aussi présenter une pluralité de logements de réception de pièces à entraîner en rotation respectives en position de rangement de chaque pièce à entraîner en rotation concernée.The tool may also have a plurality of receiving housings of parts to be rotated respectively in the storage position of each piece to rotate in question.

Selon un aspect avantageux, l'outil peut présenter deux parties de préhension s'étendant radialement de manière diamétralement opposée.According to an advantageous aspect, the tool may have two gripping portions extending radially diametrically opposite.

Un moyen de préhension s'étendant radialement depuis le corps d'entraînement est avantageusement monté de manière amovible sur le corps principal.A gripping means extending radially from the driving body is advantageously removably mounted on the main body.

D'autres caractéristiques, buts et avantages de l'invention apparaîtront à la lecture de description détaillée qui va suivre, faite en référence aux figures annexées sur lesquelles :

  • la figure 1 est une vue de face d'un corps d'entraînement conforme à une variante préférée de l'invention,
  • la figure 2 est une vue de face de ce même corps d'entraînement, équipé de deux éléments élastiques et d'un embout conformes à l'invention,
  • la figure 3 est une vue de face de ce même ensemble, dans une situation d'effacement des organes élastiques,
  • la figure 4 est une vue en perspective d'un organe élastique conforme à une variante de l'invention,
  • la figure 5 est une vue en perspective d'un couple constitué d'un embout et d'un organe élastique conformes à une troisième variante de l'invention,
  • la figure 6 est une vue en perspective de ce même ensemble, selon un positionnement différent de l'organe élastique,
  • la figure 7 représente une couronne intermédiaire, conforme à une variante de l'invention,
  • la figure 8 représente une variante d'organes élastiques, sous la forme d'un couple de barrettes,
  • la figure 9 représente un organe élastique selon une variante de l'invention, sous la forme d'une rondelle Belleville,
  • les figures 10 et 11 représentent un outil conforme à une variante de l'invention, à deux logements opposés de réception d'embouts différents,
  • la figure 12 représente une variante d'outil selon l'invention, comportant une partie de préhension de type symétrique,
  • la figure 13 représente une variante de l'invention, à partie de préhension amovible.
Other features, objects and advantages of the invention will appear on reading the detailed description which follows, with reference to the appended figures in which:
  • the figure 1 is a front view of a driving body according to a preferred variant of the invention,
  • the figure 2 is a front view of the same driving body, equipped with two elastic elements and a nozzle according to the invention,
  • the figure 3 is a front view of this same set, in a situation of erasure of the elastic members,
  • the figure 4 is a perspective view of an elastic member according to a variant of the invention,
  • the figure 5 is a perspective view of a pair consisting of a tip and an elastic member according to a third variant of the invention,
  • the figure 6 is a perspective view of this same assembly, according to a different positioning of the elastic member,
  • the figure 7 represents an intermediate ring, according to a variant of the invention,
  • the figure 8 represents a variant of elastic members, in the form of a pair of bars,
  • the figure 9 represents an elastic member according to a variant of the invention, in the form of a Belleville washer,
  • the Figures 10 and 11 represent a tool according to a variant of the invention, with two opposite receiving housings of different ends,
  • the figure 12 represents a tool variant according to the invention, comprising a symmetrical type of gripping part,
  • the figure 13 represents a variant of the invention, with detachable gripping portion.

Le corps d'entraînement de la figure 1 se présente sous la forme d'un corps cylindrique muni d'un cavité intérieure 10. Cette cavité intérieure 10 se divise en trois logements principaux. Un logement central 11 présente un contour sensiblement circulaire, de diamètre équivalent à celui d'un embout 20 destiné à venir s'y loger.The training body of the figure 1 is in the form of a cylindrical body provided with an inner cavity 10. This inner cavity 10 is divided into three main housing. A central housing 11 has a substantially circular contour, of diameter equivalent to that of a nozzle 20 to be housed there.

Deux logements latéraux 12 et 13 sont ménagés en communication latérale avec le logement central 11. Ces deux logements latéraux 12 et 13 s'étendent chacun sous la forme d'une chambre 14, 15 rectiligne et sécante au logement central 11 et en outre sous la forme d'un bombage extérieur 16, 17 qui s'étend en éloignement du logement central 11. En d'autres termes, chaque logement latéral 12 et 13 forme à la fois une chambre rectiligne et latérale 14, 15 au logement central 11, et forme à la fois un prolongement direct et radial sous la forme du bombage.Two lateral housings 12 and 13 are arranged in lateral communication with the central housing 11. These two Lateral housings 12 and 13 each extend in the form of a rectilinear and intersecting chamber 14 to the central housing 11 and further in the form of an outer bending 16, 17 extending away from the central housing 11. In other words, each lateral housing 12 and 13 forms both a rectilinear and lateral chamber 14, 15 to the central housing 11, and forms both a direct and radial extension in the form of the bending.

Tel qu'illustré à la figure 2, chaque logement latéral reçoit une lame 34, 35 venant épouser la chambre rectiligne 14, 15 et sécante au logement central. Les deux lames 34 et 35 viennent donc se positionner latéralement et de manière parallèle au logement central 11. Dans cette position, chacune des lames 34, 35 intersecte le logement central 11 en bordure de ce dernier, définissant de ce fait la largeur de celui-ci.As illustrated in figure 2 each lateral housing receives a blade 34, 35 coming to marry the rectilinear chamber 14, 15 and secant to the central housing. The two blades 34 and 35 are therefore positioned laterally and parallel to the central housing 11. In this position, each of the blades 34, 35 intersects the central housing 11 on the edge thereof, thereby defining the width of the latter. this.

Le logement central 11 se voit donc équipé de deux bordures latérales rectilignes en vis-à-vis. Le bombage extérieur 16, 17 de chaque logement latéral 12, 13 découvre alors une partie centrale de la lame 34, 35 associée, qui reste néanmoins maintenue en position au niveau de ses extrémités.The central housing 11 is therefore equipped with two rectilinear lateral edges vis-à-vis. The outer bending 16, 17 of each lateral housing 12, 13 then discovers a central portion of the associated blade 34, 35, which nevertheless remains held in position at its ends.

Tel qu'illustré à la figure 2, L'embout hexagonal 20 est positionné entre les deux lames 34 et 35 au sein du logement central 11 du corps d'entraînement 10. La largeur entre faces de cet embout hexagonal 20 étant égale à l'écartement entre les lames, l'embout 20 épouse la largeur du logement central 11 limité par les lames 34 et 35.As illustrated in figure 2 , The hexagonal tip 20 is positioned between the two blades 34 and 35 within the central housing 11 of the drive body 10. The width between the faces of this hexagonal tip 20 being equal to the spacing between the blades, the tip 20 matches the width of the central housing 11 limited by the blades 34 and 35.

Le diamètre entre arêtes de l'embout 20 étant en outre égal à celui du logement central 11, les arêtes, référencées 21 sur la figure 2, viennent donc au contact de la partie périphérique et circulaire du logement central 11.The diameter between the edges of the end piece 20 being furthermore equal to that of the central housing 11, the edges, referenced 21 on the figure 2 , therefore come into contact with the peripheral and circular portion of the central housing 11.

Les lames 34 et 35 présentent une rigidité suffisante pour constituer un appui latéral ferme. Ainsi, l'embout 20 est entraîné en rotation simultanément avec le corps d'entraînement 10 à la façon d'un emboîtement strict entre deux éléments rigides.The blades 34 and 35 have sufficient rigidity to form a firm lateral support. Thus, the tip 20 is rotated simultaneously with the driving body 10 in the manner of a strict interlocking between two rigid elements.

Toutefois chacune des deux lames 34 et 35 est libre de fléchir en écartement en présence d'une force d'appui radial excessive de la part de l'embout 20. Cette situation est représenté à la figure 3.However, each of the two blades 34 and 35 is free to flex in spacing in the presence of an excessive radial bearing force from the tip 20. This situation is shown in FIG. figure 3 .

Une telle situation de flexion des lames 34 et 35 apparaît lorsque l'élément vissé, par exemple un écrou ou un boulon, arrive en position de butée et fait l'objet d'un serrage final.Such a situation of bending of the blades 34 and 35 appears when the screwed element, for example a nut or a bolt, arrives in the stop position and is the subject of a final tightening.

Dans une première phase du serrage, la rotation du corps d'entraînement 10 est transmise à l'élément vissé, par l'intermédiaire de l'embout 20. Ces différents éléments restant solidaires les uns des autres.In a first phase of the clamping, the rotation of the driving body 10 is transmitted to the screwed element, through the endpiece 20. These various elements remaining integral with each other.

Toutefois lorsque l'utilisateur continue à appliquer un couple de serrage avec force, les lames fléchissent en écartement. Ce fléchissement est provoqué par la poussée d'une arête 21 de l'embout 20 sur la partie courante de la lame considérée 34, 35. L'arête pénètre progressivement dans l'espace initialement occupé par la lame 34, 35, repoussant progressivement celle-ci en fléchissement radial.However, when the user continues to apply a tightening torque with force, the blades flex in spacing. This deflection is caused by the thrust of an edge 21 of the tip 20 on the running portion of the blade considered 34, 35. The edge gradually penetrates into the space initially occupied by the blade 34, 35, gradually pushing back the in radial bending.

Le fléchissement est maximal lorsque l'arête 21 atteint le centre de la lame 34, 35. La lame 34, 35 occupe alors le bombage 16, 17 du logement latéral considéré 12, 13. Ses extrémités se rétractent quant à elles dans la chambre rectiligne associée 14, 15.The deflection is maximum when the edge 21 reaches the center of the blade 34, 35. The blade 34, 35 then occupies the bending 16, 17 of the lateral housing considered 12, 13. Its ends retract in turn in the rectilinear chamber associated 14, 15.

L'apparition du phénomène de flexion de chaque lame 34, 35 donne lieu à une désolidarisation en rotation entre le corps d'entraînement 10 et l'embout 20, empêchant le couple appliqué par l'utilisateur de se transmettre sur l'embout au-delà d'une certaine valeur de couple. Le phénomène de flexion de la lame limite donc la valeur du couple qui est transmis sur l'embout.The occurrence of the bending phenomenon of each blade 34, 35 gives rise to a separation in rotation between the driving body 10 and the end piece 20, preventing the torque applied by the user to be transmitted on the end-piece. beyond a certain torque value. The bending phenomenon of the blade therefore limits the value of the torque that is transmitted on the tip.

Les lames 34, 35 sont choisies avec une raideur en flexion qui est telle que ce phénomène de flexion apparaisse pour un couple de serrage choisi. La raideur en flexion est obtenue par un choix adapté du matériau constitutif de la lame et/ou par une épaisseur choisie de celle-ci. Le couple maximal transmis correspond à l'arrivée de chaque lame 34, 35 en flexion maximale. Cette situation correspond aussi l'immobilisation en rotation de l'embout 20 et de l'élément vissé auquel il est associé.The blades 34, 35 are chosen with a flexural stiffness which is such that this bending phenomenon appears for a chosen tightening torque. The bending stiffness is obtained by a suitable choice of the material constituting the blade and / or by a selected thickness thereof. The maximum torque transmitted corresponds to the arrival of each blade 34, 35 in maximum flexion. This situation also corresponds the immobilization in rotation of the tip 20 and the screw element with which it is associated.

La résistance de la lame 34, 35 au franchissement par l'arête 21 relève également des propriétés tribologiques de la lame, c'est-à-dire de son état de surface. L'état de surface de chaque lame 34, 35 sera choisi d'autant rugueux que l'on souhaite une opposition importante au franchissement de la lame.The resistance of the blade 34, 35 to the crossing by the edge 21 also falls tribological properties of the blade, that is to say, its surface state. The surface state of each blade 34, 35 will be selected as rough as it is desired a significant opposition to the crossing of the blade.

L'utilisateur poursuit typiquement son mouvement de rotation, provoquant un franchissement de la lame 34, 35 par l'arête 21 l'ayant précédemment repoussée. L'arête poursuit 21 son glissement sur la lame 34, 35 au-delà du centre de cette dernière. Cette deuxième partie du glissement correspond à un retour en position de la lame 34, 35 de sorte que l'utilisateur ne ressent qu'une faible opposition à la rotation.The user typically continues its rotational movement, causing a crossing of the blade 34, 35 by the edge 21 having previously repelled. The edge continues to slide on the blade 34, 35 beyond the center of the blade. This second part of the sliding corresponds to a return to position of the blade 34, 35 so that the user feels only a slight opposition to the rotation.

Après franchissement de la lame 34, 35 par l'arête 21 considérée, l'utilisateur comprend que le couple maximal a été atteint. Si l'utilisateur ne remarque pas ce phénomène, il peut poursuivre la rotation de l'élément d'entraînement et réitérer un ou plusieurs franchissements de la lame 34, 35 par des arêtes 21 consécutives. Aucun couple excessif n'est transmis sur l'élément vissé.After crossing the blade 34, 35 by the edge 21 considered, the user understands that the maximum torque has been reached. If the user does not notice this phenomenon, he can continue the rotation of the drive element and repeat one or more crossings of the blade 34, 35 by consecutive edges 21. No excessive torque is transmitted on the screwed element.

Après serrage, l'utilisateur extrait l'embout 20 vis-à-vis de l'élément vissé.After tightening, the user extracts the tip 20 vis-à-vis the screw element.

L'embout 20 se présente alors dans la situation de la figure 2, c'est-à-dire en association complémentaire avec les lames 34, 35 au repos. Le dispositif est donc automatiquement opérationnel pour un serrage ultérieur.The tip 20 is then in the situation of the figure 2 , that is to say in complementary association with the slides 34, 35 at rest. The device is therefore automatically operational for subsequent tightening.

Ce dispositif présente un comportement symétrique en serrage selon un pas à droite et selon un pas à gauche, avec une même limitation de couple sans manipulation ni réglage. Il permet donc le desserrage et/ou le resserrage au couple exigé dans les deux sens.This device has a symmetrical clamping behavior in a step to the right and in a step to the left, with the same torque limitation without manipulation or adjustment. It allows loosening and / or retightening at the required torque in both directions.

L'invention ne se limite pas aux formes précédemment décrites.The invention is not limited to the forms previously described.

Ainsi, l'embout ici représenté avec une section hexagonale, peut être un embout à section carrée ou encore un embout ayant des méplats latéraux.Thus, the tip here shown with a hexagonal section, may be a square section nozzle or a tip having lateral flats.

Ainsi, les lames rectilignes 34, 35 peuvent être remplacées par une lame de forme différente.Thus, the straight blades 34, 35 may be replaced by a blade of different shape.

La lame 36 proposée à la figure 4 présente une ondulation centrale 37 qui est idéalement placée en élévation vers l'embout 20. Cette ondulation centrale 37 forme un léger obstacle à l'encontre du franchissement de l'arête 21, accroissant ainsi le couple maximal.The blade 36 proposed at figure 4 has a central corrugation 37 which is ideally placed in elevation towards the tip 20. This central corrugation 37 forms a slight obstacle against the crossing of the edge 21, thus increasing the maximum torque.

Cette ondulation centrale 37 est ressentie par l'utilisateur, lui signalant par là l'atteinte du couple maximal.This central ripple 37 is felt by the user, thereby signaling the attainment of maximum torque.

Lorsque placée en écartement de l'embout 20, cette ondulation 37 réduit au contraire la valeur du couple transmis lorsque l'arête 21 arrive en position centrale de la lame 36, réduisant la valeur du couple maximal appliqué.When placed at a distance from the endpiece 20, this corrugation 37 on the contrary reduces the value of the torque transmitted when the edge 21 reaches the central position of the blade 36, reducing the value of the maximum torque applied.

De plus, une telle lame 36 est plus facilement fléchie vers le sens dans lequel s'élève l'ondulation que dans le sens de flexion opposé.In addition, such a blade 36 is more easily bent towards the direction in which the ripple rises than in the opposite direction of bending.

Une interversion du sens de la lame 36 permet donc de choisir entre deux valeurs différentes du couple maximal. Un outil de serrage faisant appel à une telle lame 36 réversible permet le serrage de deux éléments pour lesquels est prescrit un couple maximal différent.An inversion of the direction of the blade 36 thus makes it possible to choose between two different values of the maximum torque. A clamping tool using such a reversible blade 36 allows the clamping of two elements for which is prescribed a different maximum torque.

Dans les variantes des figures 8 et 9, la lame est remplacée respectivement par une barrette flexible 38 de section circulaire et/ou par une rondelle Belleville 39, c'est-à-dire par une rondelle non-plate et préférentiellement conique ou bombée.In the variants of Figures 8 and 9 the blade is replaced respectively by a flexible bar 38 of circular section and / or by a Belleville washer 39, that is to say by a non-flat washer and preferably conical or curved.

Dans le cas d'une barrette 38 comme d'une rondelle Belleville 39, ces dernières sont avantageusement placées dans un logement rectiligne et sécant 14, 15 conforme au logement qui vient d'être décrit en référence aux figures 1 à 3.In the case of a bar 38 such as a Belleville washer 39, the latter are advantageously placed in a rectilinear and secant housing 14, 15 in accordance with the housing which has just been described with reference to FIGS. Figures 1 to 3 .

La rondelle Belleville 39 est placée en élévation vers l'embout 20 ou en élévation vers l'extérieur, selon la valeur du couple maximal souhaité.The Belleville washer 39 is placed in elevation towards the end piece 20 or in outward elevation, depending on the value of the maximum desired torque.

L'élément représenté à la figure 7 est une couronne 40 dont un passage central 41 est choisi spécifiquement complémentaire à un embout de vissage 20.The element represented in figure 7 is a ring 40 of which a central passage 41 is chosen specifically complementary to a screwdriver bit 20.

Ce passage central 41 est ici hexagonal. Le contour extérieur 42 de cette couronne 40 est spécifiquement non circulaire. Il présente deux bossages 44 et 45 diamétralement opposés alors que le reste du contour 42 est circulaire.This central passage 41 is here hexagonal. The outer contour 42 of this ring 40 is specifically non-circular. It has two bosses 44 and 45 diametrically opposed while the rest of the contour 42 is circular.

Cette couronne 40 est avantageusement placée à l'intérieur d'un corps d'entraînement 10 tel que celui qui vient d'être décrit en référence aux figures 1 à 3.This ring 40 is advantageously placed inside a driving body 10 such as that which has just been described with reference to the Figures 1 to 3 .

L'écartement entre les lames 34 et 35 est alors égal au diamètre du contour externe 42 de la couronne 40 dans sa partie courante circulaire. Ainsi, les bossages 44 et 45 viennent s'appuyer contre chacune des deux lames latérales 34 et 35, bloquant la rotation mutuelle entre corps d'entraînement 10 et couronne 40.The spacing between the blades 34 and 35 is then equal to the diameter of the outer contour 42 of the ring 40 in its circular running portion. Thus, the bosses 44 and 45 come to bear against each of the two lateral blades 34 and 35, blocking the mutual rotation between drive body 10 and crown 40.

Les bossages 44 et 45 repoussent toutefois les lames 34 et 35 lorsque le couple maximal autorisé est atteint. Chaque bossage 44, 45 franchit alors une lame 34, 35 qu'il fléchit en écartement.The bosses 44 and 45, however, push the blades 34 and 35 when the maximum permitted torque is reached. Each boss 44, 45 then crosses a blade 34, 35 which it flexes in spacing.

Cette variante permet à l'utilisateur d'opter entre différents couples maximaux. En effet, plusieurs couronnes du même type que la couronne 40 sont fournies à l'utilisateur, avec des bossages 44, 45 d'étendues radiales différentes. Plus les bossages 44, 45 sont d'étendue prononcée, et plus le couple nécessaire au fléchissement des lames 34, 35 est important.This variant allows the user to choose between different maximum torques. Indeed, several crowns of the same type as the crown 40 are provided to the user, with bosses 44, 45 of different radial extent. The more the bosses 44, 45 are of pronounced extent, and the greater the torque necessary for the deflection of the blades 34, 35 is important.

Les différentes couronnes sont avantageusement marquées de la valeur du couple maximal qu'elles produisent.The different crowns are advantageously marked with the value of the maximum torque that they produce.

Outre une variante de corps d'entraînement à deux éléments élastiques tels que les lames 34 et 35, on prévoit également selon l'invention que le dispositif ne comporte qu'un seul élément élastique.In addition to an alternative drive body with two elastic elements such as the blades 34 and 35, it is also provided according to the invention that the device comprises only one elastic element.

L'un des deux logements latéraux 12, 13 des figures 1 à 3 est alors remplacé par une paroi pleine, les dimensions du logement central 11 étant élargies pour autoriser un léger décalage latéral de l'embout 20 au fléchissement de la lame unique.One of the two lateral housings 12, 13 of the Figures 1 to 3 is then replaced by a solid wall, the dimensions of the central housing 11 being widened to allow a slight lateral shift of the tip 20 to the deflection of the single blade.

Dans une variante représentée aux figures 5 et 6, un même organe élastique 50 peut présenter deux faces 51 et 52 en vis-à-vis l'une de l'autre.In a variant shown in figures 5 and 6 a same elastic member 50 may have two faces 51 and 52 vis-à-vis one another.

L'organe élastique des figures 5 et 6 présente la forme d'un U.The elastic organ of the figures 5 and 6 has the shape of a U.

Sur la figure 5, l'organe élastique en U s'étend dans un plan qui est transversal à la direction principale de l'embout 20, et dont les branches constituent les faces d'appui 51, 52 en direction de l'embout 20.On the figure 5 , the U-shaped elastic member extends in a plane which is transverse to the main direction of the endpiece 20, and whose branches constitute the bearing faces 51, 52 in the direction of the endpiece 20.

Cet organe élastique en U 50 est positionné dans le corps d'entraînement 10 en prévoyant une liberté de coulissement longitudinal de l'organe élastique dans le corps d'entraînement.This elastic U-shaped member 50 is positioned in the driving body 10 by providing a longitudinal freedom of sliding of the elastic member in the driving body.

Pour cela, les logements rectilignes 14 et 15 des figures 1 à 3 sont prolongés jusqu'à déboucher en périphérie du corps d'entraînement 10. La base de la forme en U de l'élément élastique recouvre alors une partie de la périphérie du corps d'entraînement 10 tandis que les extrémités libres 53, 54 de l'organe en U dépassent en partie diamétralement opposée du corps d'entraînement 10. Les extrémités libres 53, 54 de l'organe en U présentent avantageusement des ondulations 55, 56 en protubérance externe. Ces ondulations 55, 56 forment des éléments de butée empêchant une sortie de l'organe 50 hors du corps d'entraînement 10 par un coulissement trop prononcé.For this, rectilinear housing 14 and 15 of Figures 1 to 3 are extended until reaching the periphery of the drive body 10. The base of the U-shape of the elastic element then covers a portion of the periphery of the driving body 10 while the free ends 53, 54 of the U-shaped member protrude in part diametrically opposite the driving body 10. The free ends 53, 54 of the U-shaped member advantageously have corrugations 55, 56 in outer protuberance. These corrugations 55, 56 form stop elements preventing an output of the member 50 from the drive body 10 by a too pronounced sliding.

L'organe en U permet un réglage du couple maximal délivré.The U-shaped member allows adjustment of the maximum torque delivered.

Lorsque la base du U est écartée au maximum du corps d'entraînement, l'embout 20 coopère avec une partie courante des branches 51, 52 du U. Cette partie courante présente une résistance à la flexion qui est similaire à celle de deux lames indépendantes telles que celles décrites en référence aux figures 1 à 3..When the base of the U is spaced as far as possible from the driving body, the endpiece 20 cooperates with a running part of the branches 51, 52 of the U. This running part has a flexural strength which is similar to that of two independent blades. such as those described with reference to Figures 1 to 3 ..

Au contraire, lorsque la base de l'organe 50 en U est rapprochée du corps d'entraînement 10, l'embout 20 coopère avec une partie des branches 51 et 52 qui est proche de la base du U. Cette partie des branches 51, 52 est particulièrement rigide puisque soumise à une force de rapprochement mutuel qui est produite par la rigidité de la base du U.On the contrary, when the base of the U-shaped member 50 is brought closer to the driving body 10, the endpiece 20 cooperates with a part of the branches 51 and 52 which is close to the base of the U. This part of the branches 51, 52 is particularly rigid since subjected to a mutual approximation force which is produced by the rigidity of the base of the U.

Dans un mode de réalisation non revendiqué, le corps d'entraînement 10 présente des moyens permettant de positionner l'organe élastique 50 selon une position telle que sa forme en U se trouve dans un même plan que l'axe principal de l'embout 20.In an embodiment not claimed, the driving body 10 has means for positioning the elastic member 50 in a position such that its U-shaped is in the same plane as the main axis of the tip 20 .

L'embout 20 coopère alors avec les extrémités 53, 54 des branches du U. Le couple maximal permis est alors particulièrement faible.The tip 20 then cooperates with the ends 53, 54 of the branches of the U. The maximum torque allowed is then particularly low.

Dans cette variante, les ondulations 55, 56 d'extrémité des branches 51, 52 sont avantageusement en protubérance vers l'intérieur de la forme en U, pour un contact sensiblement rectiligne avec l'embout 20.In this variant, the end corrugations 55, 56 of the limbs 51, 52 are advantageously protruding towards the inside of the U-shape, for a substantially rectilinear contact with the endpiece 20.

Le corps d'entraînement 10 permet avantageusement les deux positionnements transversal et aligné de l'organe élastique en U, pour un choix varié de la valeur du couple maximal délivré.The driving body 10 advantageously allows both transverse and aligned positioning of the U-shaped elastic member, for a varied choice of the value of the maximum torque delivered.

La clé de serrage représentée à la figure 10 présente également un corps d'entraînement 10 de forme cylindrique. Ce corps d'entraînement est prolongé latéralement par une poignée 60. Cette poignée est munie deux logements longitudinaux 61 et 62 recevant chacun un embout 20, 25.The tightening wrench shown in figure 10 also has a drive body 10 of cylindrical shape. This driving body is extended laterally by a handle 60. This handle is provided with two longitudinal housings 61 and 62 each receiving a tip 20, 25.

Chacun de ces logements 61, 62 présente une largeur complémentaire à celle de la forme hexagonale de l'embout considéré 20, 25. Le logement supérieur 61 présente une largeur de diamètre égal à 9,2 mm, pour un embout 20 de type TX 50.Each of these housings 61, 62 has a width complementary to that of the hexagonal shape of the considered endpiece 20, 25. The upper housing 61 has a width of diameter equal to 9.2 mm, for a tip 20 type TX 50 .

Le logement inférieur 62 présente une largeur de 7,4 mm, pour la réception d'un embout 25 de type TX20.The lower housing 62 has a width of 7.4 mm for receiving a tip type TX20.

Il s'agit là des dimensions de la partie courante de l'embout, chacun de ces embouts 20, 25 étant muni d'une tête de type « alêne » de diamètre inférieur.These are the dimensions of the current portion of the nozzle, each of these tips 20, 25 being provided with a head type "awl" of smaller diameter.

Le corps d'entraînement 10 présente lui-même deux faces opposées 18, 19 dont chacune est munie d'un logement central 11a, 11b de réception d'embout. Chacun de ces logements 11a et 11b présente une structure sensiblement conforme à celle décrite précédemment en référence aux figures 1 à 3.The driving body 10 itself has two opposite faces 18, 19 each of which is provided with a central receiving housing 11a, 11b of receiving tip. Each of these housings 11a and 11b has a structure substantially in accordance with that described above with reference to the Figures 1 to 3 .

Toutefois les dimensions de ces deux logements 11a et 11b sont différentes, le logement 11a de la face 18 étant prévu pour la réception de l'embout 20 de type TX 50 tandis que le logement 11b de la face 19 est prévu pour la réception de l'embout 25 de type TX 20.However, the dimensions of these two housings 11a and 11b are different, the housing 11a of the face 18 being provided for the reception of the tip 20 TX type 50 while the housing 11b of the face 19 is provided for the reception of the tip type TX 20.

Chacun de ces logements 11a et 11b est de plus muni d'éléments élastiques de raideurs différentes, de sorte que le couple maximal destiné à l'embout 20 de type TX 50 est supérieur au couple maximal destiné à l'embout 25 de type TX 20.Each of these housings 11a and 11b is furthermore provided with elastic elements of different stiffnesses, so that the maximum torque intended for the tip 20 of the TX 50 type is greater than the maximum torque intended for the tip 25 of the TX 20 type. .

La présente clé de serrage permet donc une action différente sur deux types de serrage.The present clamping wrench thus allows a different action on two types of clamping.

Toutefois cette clé de serrage ne présente aucun risque de méprise sur la valeur du couple appliqué.However this tightening wrench does not present any risk of mistake on the value of the applied torque.

En effet, l'embout 25 de type TX 20 ne peut coopérer avec le logement destiné à l'embout 20 de type TX 50, car il y pivote sans retenue.Indeed, the tip 25 TX type 20 can cooperate with the housing for the tip 20 type TX 50, because it pivots without restraint.

A contrario, l'embout 20 de type TX 50 ne peut pénétrer dans le logement destiné à l'embout 25 de type TX 20. Ce corps d'entraînement 10 à deux logements 11a et 11b joue donc également le rôle de détrompeur entre les embouts 20 et 25 à utiliser.On the other hand, the tip 20 of the TX 50 type can not penetrate into the housing intended for the tip 25 of the TX 20 type. This drive body 10 with two housings 11a and 11b thus also plays the role of polarizer between the end pieces. 20 and 25 to use.

Dans la variante de la figure 12, le dispositif présente un corps d'entraînement 10 semblable à celui qui vient d'être décrit en référence aux figures 10 et 11.In the variant of the figure 12 , the device has a driving body 10 similar to that which has just been described with reference to the Figures 10 and 11 .

La poignée de préhension est toutefois scindée en deux parties 63 et 64 diamétralement opposées.The handle is however split into two parts 63 and 64 diametrically opposed.

Chacune de ces deux parties 63 et 64 présente ici un seul logement respectif 61 et 62 pour le rangement d'un embout associé.Each of these two parts 63 and 64 here has a single respective housing 61 and 62 for storing an associated endpiece.

La clé de la figure 12 présente l'avantage d'un serrage par action simultanée sur chacune des deux parties diamétralement opposées 63 et 64, pour un serrage à la façon d'un écrou « papillon ».The key to figure 12 has the advantage of clamping by simultaneous action on each of the two diametrically opposite parts 63 and 64, for clamping in the manner of a nut "butterfly".

La variante de la figure 13 consiste en l'association d'un corps d'entraînement 10 similaire à celui décrit en référence aux figures 10 et 11 avec un élément de préhension 65 qui est spécifiquement amovible.The variant of the figure 13 consists of the combination of a driving body 10 similar to that described with reference to Figures 10 and 11 with a gripping member 65 which is specifically removable.

Le corps d'entraînement 10 est muni pour cela d'un passage transversal 65 situé à mi-hauteur qui reçoit une tige de serrage 66 qui est amovible en glissement.The driving body 10 is provided for it with a transverse passage 65 located at mid-height which receives a clamping rod 66 which is removable in sliding.

La tige de serrage 66 s'étend transversalement au corps d'entraînement 10 et forme alors l'élément de préhension.The clamping rod 66 extends transversely to the driving body 10 and then forms the gripping element.

Un tel assemblage amovible permet de venir positionner le corps d'entraînement 10 sur l'élément à visser, puis, seulement ultérieurement, de placer la tige de serrage 66 dans le corps d'entraînement 10.Such a removable assembly makes it possible to position the driving body 10 on the element to be screwed, and then, only subsequently, to place the clamping rod 66 in the driving body 10.

Une telle mise en place en deux temps permet à l'utilisateur de réaliser un vissage préliminaire sans la tige 66, par manipulation directe du corps d'entraînement 10.Such an installation in two stages allows the user to perform a preliminary screwing without the rod 66, by direct manipulation of the driving body 10.

Un tel vissage préliminaire s'avère plus rapide en l'absence d'élément de préhension s'étendant radialement.Such preliminary screwing is faster in the absence of radially extending gripping element.

La présente invention et en particulier les modes de réalisation décrits ci-avant et comportant plusieurs logements destinés à délivrer des couples différents permet de résoudre notamment le problème posé par les vis et écrous-vis de galerie de véhicule automobile qui doivent respecter avec précision des couples de serrage différents.The present invention and in particular the embodiments described above and comprising a plurality of housings intended to deliver different couples makes it possible to solve, in particular, the problem posed by motor vehicle tunnel bolts and nuts which must respect couples precisely. different clamping.

De même, l'ensemble des aménagements décrits en référence à l'entraînement de l'embout 20 peut s'appliquer à l'entraînement direct d'une pièce vissée telle que vis, boulon ou écrou.Similarly, all the arrangements described with reference to the drive of the nozzle 20 may be applied to the direct drive of a screwed piece such as screw, bolt or nut.

Dans ce mode de réalisation, la pièce vissée présente une tête, éventuellement hexagonale ou carrée, qui vient se placer dans le logement de réception 11 de la même façon que l'embout 20 décrit ci-avant.In this embodiment, the screwed part has a head, possibly hexagonal or square, which is placed in the receiving housing 11 in the same way as the tip 20 described above.

A la fin du serrage, la tête de l'élément vissé est séparée du corps d'entraînement 10 et laissée en place. Elle est libérée si besoin de son éventuelle couronne additionnelle 40.At the end of the tightening, the head of the screwed element is separated from the driving body 10 and left in place. It is released if need of its possible additional crown 40.

Le corps d'entraînement 10, ici entraîné manuellement, peut également être entraîné par une machine tournante.The driving body 10, here manually driven, can also be driven by a rotating machine.

Claims (10)

  1. Screwing tool having a mechanism for limiting the tightening torque by the action of elastic means which yield and leave tightening surfaces disengaged when a limit tightening torque is reached, comprising a main body (10) for driving in rotation an end piece (20) of an element to be screwed, an elastic member (34, 35, 36, 50) arranged in the main body (10) and of which the bending, caused by the action of the preset limit tightening torque, ensures that the end piece (20) is disengaged from rotational drive, characterized in that the torque-limiting elastic member (34, 35, 36, 50) is a flexible strip (34, 35, 36) which presses directly, by a tightening drive surface, against a corresponding surface of the end piece (20), this flexible strip being placed in a substantially straight-line recess (14, 15) arranged so as to intersect a central recess (11), a cavity (16, 17) located beyond the straight-line recess (14, 15) away from the central recess (11) allowing the strip (34, 35, 36) to bend, the lateral drive pressure arrangement thus formed moving aside by means of the bending of the elastic member (34, 35, 36, 50) when the limit tightening torque is reached.
  2. Tool according to Claim 1, characterized in that the direct pressure arrangement is a U-shaped
    flexible strip (50), the two legs of which are centred either side of the screwing axis of the part to be screwed (20) and press with their inner face (51, 52) on the part to be screwed (20).
  3. Tool according to Claim 2, characterized in that the drive body (10) and the U-shaped flexible strip (50) are in slidable contact with each other such that the part to be driven (20) engages with a portion of this strip (50) which is closer to or further from the base thereof depending on its position of sliding with respect to the main body (10).
  4. Tool according to any one of the preceding claims, characterized in that the lateral pressure arrangement consists of a small bar (38) of substantially circular cross section.
  5. Tool according to any one of Claims 1, 2 and 3, characterized in that the elastic element consists of a Belleville washer (39).
  6. Tool according to any one of the preceding claims, characterized in that it comprises a crown (40) having a non-circular contour (42), placed between this part (20) and the lateral pressure element (34, 35) and receiving the part to be driven (20).
  7. Tool according to any one of the preceding claims, characterized in that the drive body (10) has two central recesses (11a, 11b) for receiving a part to be driven (20) which, when fitted with their respective elastic element (34, 35), have different internal dimensions such that the part to be driven (20) intended for one of the recesses (11a, 11b) cannot be received in the other recess (11a, 11b).
  8. Tool according to Claim 7, characterized in that the recesses for receiving a part to be driven (11a, 11b) are placed on opposite faces (18, 19) of the main body (10) having a plurality of recesses for receiving respective parts to be driven (20, 25) when each respective end piece is in the storage position.
  9. Tool according to any one of the preceding claims, characterized in that it has two gripping portions (61, 62) extending diametrically opposed in the radial direction, perpendicular to the screwing axis.
  10. Tool according to any one of the preceding claims, characterized in that it has a gripping means (66) removably mounted on the drive body (10) and extending radially therefrom.
EP20050292187 2004-10-19 2005-10-18 Torque limiting tool Not-in-force EP1649980B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0411094A FR2876612B1 (en) 2004-10-19 2004-10-19 IMPROVED TORQUE LIMIT KEY

Publications (2)

Publication Number Publication Date
EP1649980A1 EP1649980A1 (en) 2006-04-26
EP1649980B1 true EP1649980B1 (en) 2013-09-18

Family

ID=34950150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050292187 Not-in-force EP1649980B1 (en) 2004-10-19 2005-10-18 Torque limiting tool

Country Status (2)

Country Link
EP (1) EP1649980B1 (en)
FR (1) FR2876612B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD767353S1 (en) 2007-05-22 2016-09-27 Ethicon Endo-Surgery, Llc Torque wrench for ultrasonic instrument

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8574252B2 (en) 2006-06-01 2013-11-05 Ethicon Endo-Surgery, Inc. Ultrasonic blade support
JP5544377B2 (en) * 2009-02-04 2014-07-09 スーリー スウェーデン アーベー Torque display device for luggage carrier foot
US8225679B2 (en) 2009-02-04 2012-07-24 Thule Sweden Ab Torque indicator device for a load carrier
CN103978453A (en) * 2014-05-19 2014-08-13 郑联群 Embedded spanner

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US2028441A (en) * 1932-07-14 1936-01-21 Black & Decker Mfg Co Clutch release for portable electric wrenches
US2332972A (en) * 1941-12-15 1943-10-26 Helena E Johnson Wrench construction
US2558158A (en) * 1945-09-08 1951-06-26 Vaco Products Co Safety tool handle
US5653151A (en) * 1995-04-24 1997-08-05 Blacklock; Gordon D. Reversible ratchet driving tool
US5643089A (en) * 1995-10-19 1997-07-01 Scott R. Hummel Non-jarring torque wrench with removable output shaft
US5746298A (en) * 1996-07-19 1998-05-05 Snap-On Technologies, Inc. Adjustable torque-limiting mini screwdriver
US6439086B1 (en) * 1996-09-17 2002-08-27 Randall A. Bahr Torque limiting device
US6499358B1 (en) * 1999-12-27 2002-12-31 Sherwood Services Ag Apparatus for applying a controlled amount of torque
TW475499U (en) * 2001-07-13 2002-02-01 Hou-Fei Hu Small torque wrench featured with fixed torque value

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD767353S1 (en) 2007-05-22 2016-09-27 Ethicon Endo-Surgery, Llc Torque wrench for ultrasonic instrument

Also Published As

Publication number Publication date
FR2876612B1 (en) 2008-05-02
EP1649980A1 (en) 2006-04-26
FR2876612A1 (en) 2006-04-21

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