EP2177961B1 - Tweezers with grasping means mounted rotatably on the arms - Google Patents

Tweezers with grasping means mounted rotatably on the arms Download PDF

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Publication number
EP2177961B1
EP2177961B1 EP09171986A EP09171986A EP2177961B1 EP 2177961 B1 EP2177961 B1 EP 2177961B1 EP 09171986 A EP09171986 A EP 09171986A EP 09171986 A EP09171986 A EP 09171986A EP 2177961 B1 EP2177961 B1 EP 2177961B1
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EP
European Patent Office
Prior art keywords
gripping element
tweezers
branch
pad
cap
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EP09171986A
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German (de)
French (fr)
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EP2177961A1 (en
Inventor
Abdenacer Ait-Mani
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D1/00—Gripping, holding, or supporting devices
    • G04D1/02—Tweezers; Vice clamps or other special hand tools for watchmakers
    • G04D1/021—Tweezers
    • 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
    • B25B9/00—Hand-held gripping tools other than those covered by group B25B7/00
    • B25B9/02—Hand-held gripping tools other than those covered by group B25B7/00 without sliding or pivotal connections, e.g. tweezers, onepiece tongs

Definitions

  • the invention relates to a tweezers having two branches joined at one end, a second end of each branch comprising a gripping element, said gripping element of each branch being mounted to freely rotate about a pivot axis to the second end of said branch.
  • the tweezers are intended for the handling of fragile objects. They have application in microelectronics where they serve as a tool for gripping and handling microelectronic components such as chips. In this type of use it is necessary to avoid any risk of degradation of the edges and the upper active face of the chip on which we can find a circuitry with low relief, for example as on CMOS chips or infrared detectors, or strong relief , for example as chips with dies of balls.
  • the tweezers commonly used comprise, as illustrated in FIG. figure 1 , two branches 1a and 1b joined at a first end 2.
  • a second end 3 of each branch 1a and 1b comprises a gripping element 4 for gripping a microelectronic component.
  • the gripping element 4 is in the extension of the branches.
  • Handling microelectronic components with such tweezers Vigilance and dexterity important to the operators. Indeed, depending on the environment where a pair of tweezers is used, the operator may have only a small range of motion. Some positions are more comfortable for left-handed operators and others for right-handed operators.
  • tweezers of the company Ideal-Tek a model of tweezers tweezers comprises gripping elements 4, as on the figure 1 in the form of removable and interchangeable tips.
  • the tips have different shapes, allowing to adapt according to the use. However, this requires disassembling each time the clamp to select the right tip. In addition, during handling, if the environment changes, it is impossible to do the same with the clamp.
  • the document WO91 / 19291 discloses a CD-ROM gripper with two arms and rotatably mounted legs for gripping a CD-ROM at its central hole.
  • the document GB769,917 discloses a clamp with interchangeable gripping elements attached to the clamp arms by screws for adjusting the angle of the gripping members relative to the arms.
  • the document JP2005342840 discloses a clamp provided at each free end with grippers mounted rotatably.
  • the rotation of the gripping elements is constrained by several fixed positions that can be occupied by the gripping elements.
  • the object of the invention is to provide an easy tweezers tweezers do not have the disadvantages of the prior art.
  • the gripping element of each branch comprises a longitudinal axis perpendicular to the corresponding pivot axis, and in that a shoe is fixed to a free end of said gripping element and arranged perpendicularly to said axis. longitudinal section of the gripping element
  • the shoe comprises a rod, parallel to the longitudinal axis of the gripping element, driven into a corresponding cavity of the gripping element, said gripping element being provided with a hole opening into said cavity, said hole being threaded and having an axis perpendicular to said rod for fixing the shoe by a screw, screwed into said hole, making a pressure on the rod.
  • the tweezers tweezers comprises two branches 1a and 1b joined at a first end 2.
  • a second end 3 of each branch 1a and 1b comprises a gripping element 4 mounted to rotate freely about a pivot axis A1 at the second end of the corresponding branch 1a or 1b.
  • the pivot axis A1 is preferably perpendicular to a longitudinal axis A2 of the branch.
  • the branches 1a and 1b have a given elasticity allowing the gripping means to be separated by a maximum distance Dmax when no stress is applied to the branches 1a and 1b.
  • Dmax maximum distance
  • an operator can, by exerting sufficient pressure on the branches, bring them closer to capture a chip. After having picked up the chip and moved it, the operator can release its pressure, the tweezers then resumes its original shape while releasing the chip.
  • the gripping element of each branch preferably comprises a longitudinal axis A3 perpendicular to the corresponding pivot axis A1, and a pad 5 is preferably attached to a free end 6 of the gripping element 4 perpendicular to the longitudinal axis A3 of the gripping element 4.
  • each gripping element 4 can be connected respectively to the second end 3 of a corresponding branch 1a by any means allowing its free rotation about the pivot axis A1, itself perpendicular to the longitudinal axis A2 of the branch 1a .
  • each branch 1a, 1b and the corresponding gripping element 4 comprise a through-hole located at the second end for the branch and at a connecting end 7 for the gripping element 4.
  • a branch and a gripping member is connected through a bolt inserted in their respective holes and a locknut screwed onto the thread of the bolt to provide the connection.
  • the pads 5 may be in the form of parallelepiped bars and are made of non-injurious materials, preferably plastic, for the component to handle.
  • the pads 5 may be made of ABS (Acrylonitrile Butadiene Styrene), polystyrene, polypropylene preferably loaded with carbon to avoid generating electrostatic charges that may damage the component to move.
  • each pad 5 is rotatable along the longitudinal axis A3 of the corresponding gripping element 4.
  • the shoe 5 can be secured to a rod 8 perpendicular to said shoe 5, and the gripping element 4 may comprise a cavity of corresponding shape to the rod 8 and whose axis is parallel to the longitudinal axis A3 of the gripping element 4.
  • the rod 8 can then be locked by a screw screwed into a threaded hole 9 opening into the cavity, preferably perpendicular to the latter.
  • the pressure provided by the screw on the rod 8 in the cavity is then sufficient to ensure the blocking.
  • the mounting of the pad then makes it possible to adjust its angle with respect to the plane comprising the branch 1a and the gripping element 4 of the tweezers.
  • each gripping element preferably has a rounded shape. This rounded shape prevents tweezers from getting stuck, especially when handled in a case. It also allows free rotation of the branches.
  • the tweezers comprise means for locking the distance separating the gripping elements 4.
  • the locking means may be in the form of an operating device using the principle of a retractable ball-type system.
  • They are two coaxial bodies. A body corresponds to a cap free in translation in a main body having a bore for receiving the cap and a locking mechanism of the cap to block its translation (not shown).
  • the locking means are in the form of a simple sliding ring.
  • the two branches 1a and 1b of the tweezers are threaded into the ring 10, and when the ring 10 slides towards the gripping elements 4, the latter begins to rub on the outer faces 11 of the branches 1a and 1b. Indeed, the more the ring 10 approaches the gripping elements 4 plus the friction increases, thus reducing the distance separating the two gripping elements 4 and, where appropriate, the pads 5.
  • gripping means 4 equipped with pads 5, free in rotation with respect to the pivot axis A1 makes it possible to keep the pads always parallel to the plane of a horizontal bench and therefore to the edges of the microelectronic component to be handled. on the bench.
  • the pivot connection between the branches and the gripping elements it is possible to take a chip in a housing or in a environment where the vertical position of the arms is not possible.
  • This advantageous configuration is due to the gravity and the sufficient weight of the gripping elements.
  • the weight of the gripping elements 4 must be sufficient to make negligible the friction forces at the connection branch / gripping element to allow free rotation of the gripping elements 4 around the axis A1.
  • the minimum weight of a gripping member is preferably at least 8 grams.
  • the branches and the gripping elements are made of an easily machinable material such as aluminum.
  • each branch intended to receive a gripping element comprises a recess 13 on an inner face 12 of the branch 1a.
  • the gripping element 4 is then coupled to the branch 1a on the side of the recess 13 and its thickness is preferably equal to the thickness of the recess 13.
  • the gripping elements 4 come , according to the angle of the branches relative to the horizontal, abutting a wall 14 delimiting the depth of the recess 13.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Surgical Instruments (AREA)
  • Manipulator (AREA)

Abstract

The tweezers have a branch (1a) whose one end (2) is joined to an end of another branch (1b). A free end (3) of each branch has a removable gripping element (4) that is freely rotated around a swivel axis (A1) at the free end of the branch. The gripping element comprises a longitudinal axis (A3) perpendicular to the corresponding swivel axis. Each branch has a removable pad (5) that is fixed to a free end (6) of the gripping element, perpendicularly to the longitudinal axis of the gripping element, where the pad is in the form of parallelepiped bar. The pad is made of plastic material.

Description

Domaine technique de l'inventionTechnical field of the invention

L'invention est relative à une pince brucelles comportant deux branches réunies à une première extrémité, une seconde extrémité de chaque branche comportant un élément de préhension, ledit élément de préhension de chaque branche étant monté à rotation libre autour d'un axe de pivotement à la seconde extrémité de ladite branche.The invention relates to a tweezers having two branches joined at one end, a second end of each branch comprising a gripping element, said gripping element of each branch being mounted to freely rotate about a pivot axis to the second end of said branch.

État de la techniqueState of the art

Les pinces brucelles sont destinées à la manipulation d'objets fragiles. Elles ont une application dans la microélectronique où elles servent d'outil de préhension et de manipulation de composants microélectroniques comme les puces. Dans ce type d'utilisation il faut éviter tout risque de dégradation des bords et de la face active supérieure de la puce sur laquelle on peut trouver une circuiterie avec faible relief, par exemple comme sur les puces CMOS ou les détecteurs infrarouges, ou fort relief, par exemple comme les puces avec matrices de billes.The tweezers are intended for the handling of fragile objects. They have application in microelectronics where they serve as a tool for gripping and handling microelectronic components such as chips. In this type of use it is necessary to avoid any risk of degradation of the edges and the upper active face of the chip on which we can find a circuitry with low relief, for example as on CMOS chips or infrared detectors, or strong relief , for example as chips with dies of balls.

Les pinces brucelles communément utilisées comportent, comme illustré à la figure 1, deux branches 1a et 1b réunies à une première extrémité 2. Une seconde extrémité 3 de chaque branche 1a et 1 b comporte un élément de préhension 4 pour saisir un composant microélectronique. L'élément de préhension 4 se situe dans le prolongement des branches. La manipulation de composants microélectroniques avec une telle pince brucelles demande une vigilance et une dextérité importantes aux opérateurs. En effet, suivant l'environnement où une pince brucelles est utilisée, l'opérateur peut n'avoir qu'une faible latitude de mouvements. Certaines positions sont plus confortables pour les opérateurs gauchers et d'autres pour les opérateurs droitiers.The tweezers commonly used comprise, as illustrated in FIG. figure 1 , two branches 1a and 1b joined at a first end 2. A second end 3 of each branch 1a and 1b comprises a gripping element 4 for gripping a microelectronic component. The gripping element 4 is in the extension of the branches. Handling microelectronic components with such tweezers Vigilance and dexterity important to the operators. Indeed, depending on the environment where a pair of tweezers is used, the operator may have only a small range of motion. Some positions are more comfortable for left-handed operators and others for right-handed operators.

Afin de faciliter les manipulations de composants microélectroniques, il existe des pinces brucelles de la société Ideal-Tek dont un modèle de pince brucelles comporte des éléments de préhension 4, comme sur la figure 1, sous la forme de pointes amovibles et interchangeables. Les pointes ont différentes formes, permettant ainsi de s'adapter en fonction de l'utilisation. Cependant, cela nécessite de démonter à chaque fois la pince pour sélectionner la bonne pointe. De plus, au cours de la manipulation, si l'environnement change, il est impossible de faire de même avec la pince.In order to facilitate the handling of microelectronic components, there are tweezers of the company Ideal-Tek, a model of tweezers tweezers comprises gripping elements 4, as on the figure 1 in the form of removable and interchangeable tips. The tips have different shapes, allowing to adapt according to the use. However, this requires disassembling each time the clamp to select the right tip. In addition, during handling, if the environment changes, it is impossible to do the same with the clamp.

Le document WO91/19291 décrit un dispositif de préhension de cédéroms muni de deux bras et présentant des pieds montés à rotation pour saisir un cédérom au niveau de son trou central.The document WO91 / 19291 discloses a CD-ROM gripper with two arms and rotatably mounted legs for gripping a CD-ROM at its central hole.

Le document GB769,917 décrit une pince avec des éléments de préhension interchangeables fixés aux bras de la pince par des vis permettant de régler l'angle des éléments de préhension par rapport aux bras.The document GB769,917 discloses a clamp with interchangeable gripping elements attached to the clamp arms by screws for adjusting the angle of the gripping members relative to the arms.

Le document JP2005342840 décrit une pince munie à chaque extrémité libre d'éléments de préhension montés à rotation. La rotation des éléments de préhension est contrainte par plusieurs positions fixes pouvant être occupées par les éléments de préhension.The document JP2005342840 discloses a clamp provided at each free end with grippers mounted rotatably. The rotation of the gripping elements is constrained by several fixed positions that can be occupied by the gripping elements.

Objet de l'inventionObject of the invention

L'objet de l'invention a pour but de réaliser une pince brucelles facile à manipuler ne présentant pas les inconvénients de l'art antérieur.The object of the invention is to provide an easy tweezers tweezers do not have the disadvantages of the prior art.

Ce but est atteint en ce que l'élément de préhension de chaque branche comporte un axe longitudinal perpendiculaire à l'axe de pivotement correspondant, et en ce qu'un patin est fixé à une extrémité libre dudit élément de préhension et disposé perpendiculairement audit axe longitudinal de l'élément de préhensionThis object is achieved in that the gripping element of each branch comprises a longitudinal axis perpendicular to the corresponding pivot axis, and in that a shoe is fixed to a free end of said gripping element and arranged perpendicularly to said axis. longitudinal section of the gripping element

Selon un mode de réalisation, le patin comporte une tige, parallèle à l'axe longitudinal de l'élément de préhension, enfoncée dans une cavité correspondante de l'élément de préhension, ledit élément de préhension étant muni d'un trou débouchant dans ladite cavité, ledit trou étant fileté et ayant un axe perpendiculaire à ladite tige permettant de fixer le patin par une vis, vissée dans ledit trou, effectuant une pression sur la tige.According to one embodiment, the shoe comprises a rod, parallel to the longitudinal axis of the gripping element, driven into a corresponding cavity of the gripping element, said gripping element being provided with a hole opening into said cavity, said hole being threaded and having an axis perpendicular to said rod for fixing the shoe by a screw, screwed into said hole, making a pressure on the rod.

Description sommaire des dessinsBrief description of the drawings

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés aux dessins annexés, dans lesquels :

  • La figure 1 représente une pince brucelles à pointes amovibles selon l'art antérieur.
  • La figure 2 illustre une pince brucelles à moyens de préhension pivotant au bout de chaque branche selon l'invention.
  • La figure 3 illustre un élément de préhension équipé d'un patin.
  • La figure 4 illustre une variante de réalisation de pince brucelles équipée de moyens de verrouillage.
  • La figure 5 illustre schématiquement une autre variante de réalisation de pince brucelles équipée de moyens de verrouillage.
Other advantages and features will emerge more clearly from the following description of particular embodiments of the invention given by way of non-limiting example and represented in the accompanying drawings, in which:
  • The figure 1 represents a pair of tweezers with removable tips according to the prior art.
  • The figure 2 illustrates tweezers tweezers gripping means at the end of each branch according to the invention.
  • The figure 3 illustrates a gripping element equipped with a pad.
  • The figure 4 illustrates a variant embodiment of tweezers equipped with locking means.
  • The figure 5 schematically illustrates another variant embodiment of tweezers equipped with locking means.

Description de modes préférentiels de réalisationDescription of preferred embodiments

Comme l'illustre la figure 2, la pince brucelles comporte deux branches 1a et 1 b réunies à une première extrémité 2. Une seconde extrémité 3 de chaque branche 1a et 1b comporte un élément de préhension 4 monté à rotation libre autour d'un axe de pivotement A1 à la seconde extrémité de la branche correspondante 1a ou 1 b. L'axe de pivotement A1 étant, de préférence, perpendiculaire à un axe longitudinal A2 de la branche.As illustrated by figure 2 , the tweezers tweezers comprises two branches 1a and 1b joined at a first end 2. A second end 3 of each branch 1a and 1b comprises a gripping element 4 mounted to rotate freely about a pivot axis A1 at the second end of the corresponding branch 1a or 1b. The pivot axis A1 is preferably perpendicular to a longitudinal axis A2 of the branch.

Les branches 1a et 1 b ont une élasticité déterminée permettant aux moyens de préhension d'être séparés par une distance maximum Dmax lorsque aucune contrainte n'est appliquée sur les branches 1a et 1b. Ainsi, les éléments de préhension 4 se faisant face, un opérateur peut, en exerçant une pression suffisante sur les branches, les rapprocher afin de saisir une puce. Après avoir saisie la puce et l'avoir déplacée, l'opérateur peut relâcher sa pression, la pince brucelles reprend alors sa forme d'origine tout en libérant la puce.The branches 1a and 1b have a given elasticity allowing the gripping means to be separated by a maximum distance Dmax when no stress is applied to the branches 1a and 1b. Thus, the gripping elements 4 facing each other, an operator can, by exerting sufficient pressure on the branches, bring them closer to capture a chip. After having picked up the chip and moved it, the operator can release its pressure, the tweezers then resumes its original shape while releasing the chip.

Comme illustré à la figure 2, l'élément de préhension de chaque branche comporte, de préférence, un axe longitudinal A3 perpendiculaire à l'axe de pivotement A1 correspondant, et un patin 5 est, de préférence, fixé à une extrémité libre 6 de l'élément de préhension 4 perpendiculairement à l'axe longitudinal A3 de l'élément de préhension 4.As illustrated in figure 2 , the gripping element of each branch preferably comprises a longitudinal axis A3 perpendicular to the corresponding pivot axis A1, and a pad 5 is preferably attached to a free end 6 of the gripping element 4 perpendicular to the longitudinal axis A3 of the gripping element 4.

De préférence, les éléments de préhension 4 et/ou les patins 5 sont amovibles, permettant ainsi de s'adapter au type de composant à déplacer, par exemple défini par ses dimensions. Chaque élément de préhension 4 peut être relié respectivement à la seconde extrémité 3 d'une branche 1a correspondante par tous moyens permettant sa libre rotation autour de l'axe de pivotement A1, lui-même perpendiculaire à l'axe longitudinal A2 de la branche 1a. À titre d'exemple, chaque branche 1a, 1b et l'élément de préhension 4 correspondant comportent un trou débouchant, situé à la seconde extrémité pour la branche et à une extrémité de liaison 7 pour l'élément de préhension 4. Une branche et un élément de préhension sont liés par l'intermédiaire d'un boulon inséré dans leurs trous respectifs et d'un contre écrou vissé sur le filetage du boulon pour assurer la liaison.Preferably, the gripping elements 4 and / or the pads 5 are removable, thus making it possible to adapt to the type of component to be displaced, for example defined by its dimensions. Each gripping element 4 can be connected respectively to the second end 3 of a corresponding branch 1a by any means allowing its free rotation about the pivot axis A1, itself perpendicular to the longitudinal axis A2 of the branch 1a . By way of example, each branch 1a, 1b and the corresponding gripping element 4 comprise a through-hole located at the second end for the branch and at a connecting end 7 for the gripping element 4. A branch and a gripping member is connected through a bolt inserted in their respective holes and a locknut screwed onto the thread of the bolt to provide the connection.

Comme illustré aux figures 2 et 3, les patins 5 peuvent se présenter sous la forme de barres parallélépipédiques et sont réalisés en matériaux non blessants, de préférence en plastique, pour le composant à manipuler. À titre d'exemple, les patins 5 peuvent être, réalisés en ABS (Acrylonitrile Butadiène Styrène), en polystyrène, en polypropylène de préférence chargé en carbone pour éviter de générer des charges électrostatiques pouvant endommager le composant à déplacer. De préférence, chaque patin 5 est mobile en rotation selon l'axe longitudinal A3 de l'élément de préhension 4 correspondant. Ainsi, le patin 5 peut être solidaire d'une tige 8 perpendiculaire audit patin 5, et l'élément de préhension 4 peut comporter une cavité de forme correspondante à la tige 8 et dont l'axe est parallèle à l'axe longitudinal A3 de l'élément de préhension 4. Une fois insérée dans la cavité, la tige 8 peut ensuite être bloquée par une vis vissée dans un trou fileté 9 débouchant dans la cavité, de préférence, perpendiculairement à cette dernière. La pression assurée par la vis sur la tige 8 dans la cavité est alors suffisante pour assurer le blocage. Le montage du patin permet alors de régler son angle par rapport au plan comportant la branche 1a et l'élément de préhension 4 de la pince brucelles.As illustrated in Figures 2 and 3 the pads 5 may be in the form of parallelepiped bars and are made of non-injurious materials, preferably plastic, for the component to handle. As for example, the pads 5 may be made of ABS (Acrylonitrile Butadiene Styrene), polystyrene, polypropylene preferably loaded with carbon to avoid generating electrostatic charges that may damage the component to move. Preferably, each pad 5 is rotatable along the longitudinal axis A3 of the corresponding gripping element 4. Thus, the shoe 5 can be secured to a rod 8 perpendicular to said shoe 5, and the gripping element 4 may comprise a cavity of corresponding shape to the rod 8 and whose axis is parallel to the longitudinal axis A3 of the gripping element 4. Once inserted into the cavity, the rod 8 can then be locked by a screw screwed into a threaded hole 9 opening into the cavity, preferably perpendicular to the latter. The pressure provided by the screw on the rod 8 in the cavity is then sufficient to ensure the blocking. The mounting of the pad then makes it possible to adjust its angle with respect to the plane comprising the branch 1a and the gripping element 4 of the tweezers.

L'extrémité de liaison 7 de chaque élément de préhension a, de préférence, une forme arrondie. Cette forme arrondie évite que la pince brucelles se coince, notamment lors d'une manipulation dans un boîtier. Elle permet aussi une libre rotation totale des branches.The connecting end 7 of each gripping element preferably has a rounded shape. This rounded shape prevents tweezers from getting stuck, especially when handled in a case. It also allows free rotation of the branches.

Selon un perfectionnement, la pince brucelles comporte des moyens de verrouillage de la distance séparant les éléments de préhension 4. Ainsi, lorsqu'un opérateur saisit un composant, il peut verrouiller le serrage de la pince et déplacer le composant sans risque de le faire tomber dans le cas où il relâcherait par inadvertance la pression exercée par ses doigts sur les branches 1 a et 1b. Les moyens de verrouillage peuvent se présenter sous la forme d'un dispositif de manoeuvre utilisant le principe d'un système rétractable de type stylo bille. Classiquement, il s'agit de deux corps coaxiaux. Un corps correspond à un capuchon libre en translation dans un corps principal comportant un alésage destiné à recevoir le capuchon et un mécanisme de verrouillage du capuchon pour bloquer sa translation (non représenté). Une pression effectuée sur le capuchon le fait coulisser dans le corps principal jusqu'à ce que la course du capuchon atteigne un seuil prédéterminé et déclenche le mécanisme verrouillant ledit capuchon en position rétractée dans le corps principal. En position rétractée, la pression peut être relâchée, le capuchon reste alors dans cette position. Une nouvelle pression sur le mécanisme permet de déverrouiller le capuchon qui redevient alors libre en translation dans le corps principal. Ce type de dispositif de manoeuvre est communément utilisé dans le domaine des stylos billes. Comme l'illustre la figure 5, l'extrémité du corps principal 16 opposée au capuchon 15 est solidaire de l'une des branches (1a sur la figure 5) de la pince brucelles et l'extrémité libre du capuchon 15 est solidaire de la branche (1b sur la figure) opposée. Ainsi, en position rétractée, la distance séparant les deux patins est fixe permettant de déplacer sans effort un composant, de taille prédéterminée, serré entre les patins.According to an improvement, the tweezers comprise means for locking the distance separating the gripping elements 4. Thus, when an operator grasps a component, he can lock the clamping of the clamp and move the component without risk of making it fall. in the event that he inadvertently releases the pressure exerted by his fingers on the branches 1a and 1b. The locking means may be in the form of an operating device using the principle of a retractable ball-type system. Classically, they are two coaxial bodies. A body corresponds to a cap free in translation in a main body having a bore for receiving the cap and a locking mechanism of the cap to block its translation (not shown). Pressure on the cap slides it into the main body until the stroke of the cap reaches a predetermined threshold and triggers the mechanism locking said cap in the retracted position in the main body. In the retracted position, the pressure can be released, the cap then remains in this position. A new pressure on the mechanism allows to unlock the cap which then becomes free in translation in the main body. This type of maneuvering device is commonly used in the field of ball pens. As illustrated by figure 5 , the end of the main body 16 opposite the cap 15 is integral with one of the branches (1a on the figure 5 ) of the tweezers and the free end of the cap 15 is integral with the arm (1b in the opposite figure). Thus, in the retracted position, the distance between the two pads is fixed to move effortlessly a component of predetermined size, clamped between the pads.

Selon un autre exemple, illustré à la figure 4, les moyens de verrouillage se présentent sous la forme d'une simple bague 10 coulissante. Les deux branches 1a et 1b de la pince brucelles sont enfilées dans la bague 10, et lorsque la bague 10 coulisse en direction des éléments de préhension 4, cette dernière commence à frotter sur des faces extérieures 11 des branches 1a et 1b. En effet, plus la bague 10 se rapproche des éléments de préhension 4 plus les frottements augmentent, réduisant ainsi la distance séparant les deux éléments de préhension 4 et, le cas échéant, les patins 5.In another example, illustrated at figure 4 the locking means are in the form of a simple sliding ring. The two branches 1a and 1b of the tweezers are threaded into the ring 10, and when the ring 10 slides towards the gripping elements 4, the latter begins to rub on the outer faces 11 of the branches 1a and 1b. Indeed, the more the ring 10 approaches the gripping elements 4 plus the friction increases, thus reducing the distance separating the two gripping elements 4 and, where appropriate, the pads 5.

L'utilisation de moyens de préhension 4 équipés de patins 5, libres en rotation par rapport à l'axe de pivotement A1, permet de garder les patins toujours parallèles au plan d'une paillasse horizontale et donc aux bords du composant microélectronique à manipuler disposé sur la paillasse. De plus, grâce à la liaison pivot entre les branches et les éléments de préhension, il est possible de venir prendre une puce dans un boîtier ou dans un environnement où la position verticale des bras n'est pas possible. Cette configuration avantageuse est due à la gravité et au poids suffisant des éléments de préhension. Le poids des éléments de préhension 4 doit être suffisant pour rendre négligeable les forces de frottements au niveau de la liaison branche/élément de préhension afin de permettre une rotation libre des éléments de préhension 4 autour de l'axe A1. Le poids minimal d'un élément de préhension est de préférence d'au moins 8 grammes.The use of gripping means 4 equipped with pads 5, free in rotation with respect to the pivot axis A1, makes it possible to keep the pads always parallel to the plane of a horizontal bench and therefore to the edges of the microelectronic component to be handled. on the bench. In addition, thanks to the pivot connection between the branches and the gripping elements, it is possible to take a chip in a housing or in a environment where the vertical position of the arms is not possible. This advantageous configuration is due to the gravity and the sufficient weight of the gripping elements. The weight of the gripping elements 4 must be sufficient to make negligible the friction forces at the connection branch / gripping element to allow free rotation of the gripping elements 4 around the axis A1. The minimum weight of a gripping member is preferably at least 8 grams.

De préférence, les branches et les éléments de préhension sont réalisés dans un matériau facilement usinable tel que l'aluminium.Preferably, the branches and the gripping elements are made of an easily machinable material such as aluminum.

Selon un perfectionnement, l'extrémité de chaque branche destinée à recevoir un élément de préhension comporte un renfoncement 13 sur une face intérieure 12 de la branche 1 a. L'élément de préhension 4 est alors accouplé à la branche 1a du côté du renfoncement 13 et son épaisseur est de préférence égale à l'épaisseur du renfoncement 13. Ainsi, lors de la manipulation de la pince brucelles, les éléments de préhension 4 viennent, selon l'angle des branches par rapport à l'horizontale, en butée d'une paroi 14 délimitant la profondeur du renfoncement 13.According to an improvement, the end of each branch intended to receive a gripping element comprises a recess 13 on an inner face 12 of the branch 1a. The gripping element 4 is then coupled to the branch 1a on the side of the recess 13 and its thickness is preferably equal to the thickness of the recess 13. Thus, during the handling of the tweezers, the gripping elements 4 come , according to the angle of the branches relative to the horizontal, abutting a wall 14 delimiting the depth of the recess 13.

Claims (8)

  1. A pair of tweezers comprising two branches (1 a, 1 b) joined at a first end (2), a second end (3) of each branch (1 a, 1 b) comprising a gripping element (4), said gripping element (4) of each branch (1 a, 1 b) being mounted rotating freely around a swivel axis (A1) at the second end (3) of said branch (1a, 1 b), tweezers characterized in that the gripping element (4) of each branch (1a, 1 b) comprises a longitudinal axis (A3) perpendicular to the corresponding swivel axis (A1), and that a pad (5) is fixed to a free end (6) of said gripping element (4) and disposed perpendicularly to said longitudinal axis (A3) of the gripping element (4).
  2. The tweezers according to claim 1, characterized in that the gripping element (4) or the pad (5) is removable.
  3. The tweezers according to one of claims 1 and 2, characterized in that the pads are made from materials chosen from ABS, Polystyrene, or Polypropylene charged with carbon.
  4. The tweezers according to anyone of claims 1 to 3, characterized in that it comprises locking means (10) for locking the distance separating the gripping elements (4).
  5. The tweezers according to claim 4, characterized in that the locking means consist of a ring (10) in which the branches of the tweezers are inserted.
  6. The tweezers according to claim 4, characterized in that the locking means comprise a cap (15) coaxial to a main body and free in translation in the main body (16), said main body (16) comprising a locking mechanism to block the cap (15) in the retracted position in the main body (16) when the travel of the cap (15) reaches a predefined threshold, the end of the main body (16) opposite the cap (15) being securedly attached to one of branches (1 a) of the tweezers and the free end of the cap (15) being securedly attached to the other branch (1 b).
  7. The tweezers according to anyone of claims 1 to 6, characterized in that each pad (5) is mobile in rotation along the longitudinal axis (A3) of the gripping element (4).
  8. The tweezers according to anyone of claims 1 to 7, characterized in that the pad comprises a rod (8) parallel to the longitudinal axis (A3) of the gripping element (4), sunk into a corresponding cavity of the gripping element (4), said gripping element (4) being provided with a hole opening out into said cavity, said hole (9) being threaded and having an axis perpendicular to said rod (8) enabling the pad (5) to be fixed by means of a screw screwed into said hole (9), exerting a pressure on the rod (8).
EP09171986A 2008-10-16 2009-10-01 Tweezers with grasping means mounted rotatably on the arms Active EP2177961B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0805735A FR2937430B1 (en) 2008-10-16 2008-10-16 TWEEZERS WITH GRIPPING ELEMENTS MOUNTED TO PIVOTE ON BRANCHES.

Publications (2)

Publication Number Publication Date
EP2177961A1 EP2177961A1 (en) 2010-04-21
EP2177961B1 true EP2177961B1 (en) 2011-04-27

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EP09171986A Active EP2177961B1 (en) 2008-10-16 2009-10-01 Tweezers with grasping means mounted rotatably on the arms

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US (1) US7938469B2 (en)
EP (1) EP2177961B1 (en)
AT (1) ATE507510T1 (en)
DE (1) DE602009001169D1 (en)
FR (1) FR2937430B1 (en)

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Also Published As

Publication number Publication date
EP2177961A1 (en) 2010-04-21
DE602009001169D1 (en) 2011-06-09
FR2937430B1 (en) 2010-12-31
US20100096871A1 (en) 2010-04-22
FR2937430A1 (en) 2010-04-23
US7938469B2 (en) 2011-05-10
ATE507510T1 (en) 2011-05-15

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