FR2896177A1

FR2896177A1 - Dowel pin fixation and removal device, has tube screwed on clamp body which recuperates force to rod, and stopper placed behind clamp body and movable around axle, where tube has piston which is moved to pressurize on nut cylinder

Info

Publication number: FR2896177A1
Application number: FR0600442A
Authority: FR
Inventors: Charles Mistretta
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-18
Filing date: 2006-01-18
Publication date: 2007-07-20
Anticipated expiration: 2026-01-18
Also published as: ATE417707T1; EP1810790A1; DE602006004294D1; FR2896177B1; EP1810790B1

Abstract

The device has a circular, rectangular or square shaped tube which integrates anchoring pins, where pins have projecting parts. The parts are arranged in a tip cylinder by an operator and are locked below a crown to constitute an intake. The tube has a piston which is moved to pressurize on a nut cylinder and returns the cylinder to original position. The tube is screwed on a clamp body (26) which recuperates force exerted by an operator through handles (35, 48) and transmits the force to a rod (40). A stopper (51) is placed behind the body and is movable around an axle (52).

Description

-1- 1 La présente invention concerne l'extraction des chevilles deThe present invention relates to the extraction of ankles from

fixation dites "à expansion" et fait suite à celle portant le n 050020400 datée du 10/01/05. Cette invention ajoute un outil nouveau au nombre de ceux décrits précédemment tout en s'appuyant sur les mêmes principes de fonctionnement. fixing said "expansion" and follows that bearing the 050020400 No. dated 10/01/05. This invention adds a new tool to those previously described while relying on the same principles of operation.

Ce nouveau dispositif a la particularité de permettre l'extraction, mais aussi la pose de ce type de chevilles sur ses supports habituels. Il est composé de trois éléments qui concourent à sa bivalence : un tube (25), un corps de pince (26), et un butoir (51) (Fig.l et Ibis, Pl. 1, Fig. 1 et Ibis Pl. 7). This new device has the particularity of allowing the extraction, but also the installation of this type of dowels on its usual supports. It is composed of three elements that contribute to its bivalence: a tube (25), a clamp body (26), and a bumper (51) (Fig.l and Ibis, Pl.1, Fig. 1 and Ibis Pl. 7).

Le tube (25) et le corps de pince (26) constituent l'outil d'extraction, le corps de 10 pince (26) et le butoir (51) constituent l'outil de pose. The tube (25) and the clamp body (26) constitute the extraction tool, the clamp body (26) and the stopper (51) constitute the setting tool.

I) OUTIL D'EXTRACTION (Planches 1, 2, 3, 4, 7, 8, 9, 10, 11) A) PRESENTATION Un tube (25), vissé sur le corps (26) d'une pince, supporte à son extrémité libre, 2 plots d'accrochage (27) et (28) munis chacun d'une partie saillante (29) et (30). 15 Le premier plot (27) est solidaire du tube mais peut pénétrer à l'intérieur de celui-ci grâce à une pression exercée par l'opérateur. Un ressort (31) permet le rappel de ce plot et le retour à sa position initiale. Le second (28), solidaire lui aussi du tube, est positionné en vis à vis du premier (27) et peut-être fixe, ou mobile (Fig. 1 et Ibis. Pl. 1, Fig. l et Ibis Pl. 7). 20 A l'intérieur du tube, coulisse un piston (32) dont l'épaisseur "e" autorise le passage de celui-ci entre les faces internes des plots (27) (28), et dont la largeur "L" est calculée de façon à permettre tout à la fois son passage dans la couronne (5) de la cheville et sa mise en butée sur le cylindre d'écrou (4). L'extrémité extérieure de ce piston (32) est maintenue centrée par une bague (33) 25 placée "en force" dans le tube. Son autre extrémité est pourvue d'un cylindre de centrage (34) doté d'un filetage intérieur (ce filetage pourrait ne pas exister et le cylindre être plein). Dans le corps de pince (26), une poignée (35), maintenue à distance de la poignée de corps (48) par le ressort (50) est mobile autour d'un axe (36) fixé sur les 2 parois 30 longitudinales de ce corps. La queue (37), prolongement de cette poignée (35), est placée -2- à l'intérieur d'un chariot (38). calée entre un axe (39) fixé sur les 2 parois longitudinales de ce chariot (38) et la partie postérieure de ce dernier. L'axe (39) est recouvert sur toute sa longueur, d'un cylindre (67) capable de tourner librement. 35 La queue (37) est composée de 2 bras (37-1) et (37.-2) liés par une entretoise (66). Entre les 2 bras (37-1) et (37-2), une tige (40) de section circulaire, coulisse librement en passant par 2 ouvertures (41) et (42) pratiquées sur les faces antérieure et postérieure du corps de pince (26). L'une de ses extrémités (43) est filetée, l'autre est pourvue d'une molette fixe (44) 40 qui permet le vissage de l'extrémité (43) sur un élément extérieur. Cette tige (40) traverse aussi de part en part le chariot (38). Le passage de la tige (40) à travers le chariot (38) peut être libre ou bloqué. A cet effet, deux systèmes peuvent être employés (en mode "extraction" et en mode "pose") : le premier basé sur l'utilisation d'une double ou simple éclisse (Planches.l, 2, 45 3, 4, 5, 6), le second sur l'utilisation d'un cliquet (Planches 7, 8, 9, 10, 11, 12, 13). I) EXTRACTION TOOL (Plates 1, 2, 3, 4, 7, 8, 9, 10, 11) A) PRESENTATION A tube (25), screwed on the body (26) of a clamp, supports its free end, 2 hooking studs (27) and (28) each provided with a projecting portion (29) and (30). The first stud (27) is integral with the tube but can penetrate inside it by a pressure exerted by the operator. A spring (31) allows the return of this pad and the return to its initial position. The second (28), also secured to the tube, is positioned opposite the first (27) and may be fixed or movable (Fig. 1 and Ibis, Fig. 1, Fig. 1 and Ibis Pl. ). Inside the tube, slides a piston (32) whose thickness "e" allows the passage thereof between the inner faces of the pads (27) (28), and whose width "L" is calculated so as to allow both its passage in the ring (5) of the pin and its abutment on the nut cylinder (4). The outer end of this piston (32) is held centered by a ring (33) 25 placed "in force" in the tube. Its other end is provided with a centering cylinder (34) with an internal thread (this thread may not exist and the cylinder may be full). In the gripper body (26), a handle (35), held away from the body handle (48) by the spring (50) is movable about an axis (36) fixed on the two longitudinal walls of this body. The tail (37), an extension of this handle (35), is placed -2- inside a carriage (38). wedged between an axis (39) fixed on the 2 longitudinal walls of the carriage (38) and the rear part thereof. The axis (39) is covered over its entire length, a cylinder (67) able to rotate freely. The tail (37) is composed of two arms (37-1) and (37.-2) linked by a spacer (66). Between the two arms (37-1) and (37-2), a rod (40) of circular section, slides freely through two openings (41) and (42) formed on the front and rear faces of the clamp body (26). One of its ends (43) is threaded, the other is provided with a fixed wheel (44) 40 which allows the screwing of the end (43) on an external element. This rod (40) also passes right through the carriage (38). The passage of the rod (40) through the carriage (38) can be free or blocked. For this purpose, two systems can be used (in "extraction" and "pose" mode): the first one based on the use of a double or single splice (Plates.l, 2, 45 3, 4, 5 , 6), the second on the use of a ratchet (Plates 7, 8, 9, 10, 11, 12, 13).

1) utilisation d'une double ou simple éclisse (Planches 1, 2, 3, 4,). (Le fonctionnement des 2 types d'éclisse est identique (Planche 2) et les explications qui suivent s'appuieront sur l'utilisation d'une double éclisse). La double éclisse (45), placée à cheval sur la paroi antérieure du chariot (38) et libre 50 de monter et de descendre sur celle-ci, autorise le coulissement de la tige (40) ou au contraire le blocage de celle-ci (et sa solidarisation complète avec le chariot), par introduction ou retrait de ses mâchoires (46) dans et hors les rainures circulaires (47) pratiquées sur la tige de chariot (40). Le type de rainure pouvant être utilisé est celui représenté figure 3, Planche 2. 55 Lorsque la double éclisse (45) est relevée, la mise en mouvement de la tige (40) par pression sur la molette (44). n'a aucune action sur le chariot (38) qui ne bouge pas et une pression sur la poignée (35) peut déplace le chariot (38) vers l'avant, sans conséquence sur la tige (40) qui reste immobile. Au contraire lorsqu'elle est baissée et que ses mâchoires (46) ont pénétré dans les 60 rainures (47) de la tige (40) (Fig. 1 bis et 2 bis, P1. 2), le chariot (38) devient solidaire de la tige (40) et 1.oute pression sur la poignée (35) entraîne sa mise en mouvement ainsi que celui de la tige (40) (Fig. 1 et Ibis, Pl. 3). -3- 2) utilisation d'un cliquet (Planches 7, 8, 9, 10, 11). Un élément appelé cliquet (62), mobile autour d'un axe (63), est placé à l'intérieur 65 du chariot (38) (Fig.l et ibis. Planche 7). L'axe (63) est fixé sur les 2 parois longitudinales du chariot (38). Un élément appelé barrette d'épaulement (65). est fixé de même sur les 2 parois longitudinales du chariot (38). Un élément flexible appelé épingle (64) est fixé quand à lui, sur la barrette 70 d'épaulement (65). Le positionnement de l'épingle (64) sur la barrette (65) doit nécessairement être fait à l'une des extrémités de celle-ci. Cette épingle peut-être de section plate (Fig. 8, P1. 8), ou de section circulaire. Dans ce dernier cas, la partie libre de l'épingle est placée dans une fente (73) faite dans l'épaisseur de la barrette d'épaulement (65). La fente (73) a pour but de guider cette 75 partie libre dans ses mouvements lorsqu'elle est sollicitée (Fig.l, Pl. 8). Le cliquet (62) et la barrette d'épaulement (65), sont placés au dessus de la tige (40). Le cliquet (62) est composé de plusieurs parties qui ont chacune une fonction particulière (Fig.l, Pl. 8). La partie principale de celui-ci est composée d'une face avant (75), dont 2 replis 80 latéraux constituent les joues (76-1) et (76-2). au travers desquelles passe l'axe (63). Cette face avant (75), est légèrement pliée sur sa partie supérieure pour constituer une surface (74) sur laquelle un opérateur peut exercer une pression tendant à faire basculer l'ensemble autour de l'axe (63). La pliure de cette face avant (75) est facultative et la partie supérieure de la face avant (75) peut rester droite. 85 La partie inférieure (70) de cette face (75) est importante : elle a pour fonction de pénétrer dans les rainures de la tige (40) et de pousser sur cette tige (40) lorsque le chariot (38) est rais en mouvement vers l'avant par action sur la poignée (35). C'est dans cette circonstance qu'intervient la barrette d'épaulement (65) : son but est de bloquer cette partie inférieure (70) lors de la poussée, pour que la face avant (75) ne 90 parte pas en arrière et soit maintenue en position verticale. Les rainures de la tige (40) peuvent être coniques (Fig. 3, Pl. 8) ou droites (Fig. 4 et 5, Pl. 8). Les 2 joues (76-1) et (76-2). sont pliées vers l'arrière pour constituer la face (72). La face (72) doit faire un certain angle "a" par rapport à la face avant (75). -4- 95 Le bas de cette face (72) constitue l'arête (71) contre laquelle la partie libre de l'épingle (64) vient s'appuyer lorsque la face avant (75) est en position verticale. La différence de hauteur entre l'arête (71) et l'axe (63) (situé légèrement plus bas), fait que l'épingle (64) en faisant pression sur l'arête (71). pousse vers l'avant, et maintient le cliquet en position verticale. 100 Il est possible de faire basculer le cliquet vers l'arrière et de le maintenir dans cette position, en faisant pression sur la partie (74). jusqu'à ce que la face (72) soit placée contre et parallèlement à la partie libre de l'épingle (64). C'est l'angle "a" que fait la face (72) avec la face (75), qui détermine la distance qui sépare la partie basse (70) de la tige (40). 105 Plus cet angle est ouvert, et plus la partie basse (70) est relevée par rapport à la tige (40) (Fig. 1, Ibis. 2, 2bis, Pl. 8). La remise du cliquet en position verticale (et son maintien dans cette position), se fait en poussant la face (74) vers l'avant jusqu'à ce que l'arête (71), soit seule en contact avec la partie libre de l'épingle (64) (Fig.l bis. PI. 8). 110 Un tube (68) est placé en force sur la partie antérieure du chariot (38). Légèrement évasé à ses 2 extrémités, il a pour rôle d'annuler l'effet de"scie" produit lors du passage du rainurage de la tige (40) dans l'ouverture faite sur cette face du chariot (38). 1) use of a double or single splice (boards 1, 2, 3, 4,). (The operation of the two types of fishplate is identical (Plate 2) and the following explanations will be based on the use of a double fishplate). The double splint (45), straddling the front wall of the carriage (38) and free 50 to ascend and descend thereon, allows the sliding of the rod (40) or on the contrary blocking thereof (and its integral integral with the carriage), by introduction or withdrawal of its jaws (46) in and out of the circular grooves (47) formed on the carriage rod (40). The type of groove that can be used is that shown in Figure 3, Plate 2. 55 When the double splint (45) is raised, the setting in motion of the rod (40) by pressing on the wheel (44). has no action on the carriage (38) which does not move and a pressure on the handle (35) can moves the carriage (38) forward, without consequence on the rod (40) which remains stationary. On the contrary, when it is lowered and its jaws (46) have penetrated into the grooves (47) of the rod (40) (Fig. 1a and 2a, P1.2), the carriage (38) becomes integral. the stem (40) and any pressure on the handle (35) causes its movement and that of the rod (40) (Fig. 1 and Ibis, Fig. 3). -3- 2) Using a ratchet (Plates 7, 8, 9, 10, 11). An element called a pawl (62), movable about an axis (63), is placed inside the carriage (38) (Fig. 1 and ibis Plate 7). The axis (63) is fixed on the two longitudinal walls of the carriage (38). An element called a shoulder bar (65). is likewise fixed on the 2 longitudinal walls of the carriage (38). A flexible element called a pin (64) is attached to it, on the shoulder bar 70 (65). The positioning of the pin (64) on the bar (65) must necessarily be made at one end thereof. This pin may be of flat section (Fig 8, P1.8), or circular section. In the latter case, the free portion of the pin is placed in a slot (73) made in the thickness of the shoulder strip (65). The slit (73) is intended to guide this free part in its movements when it is stressed (Fig.l, Fig. 8). The pawl (62) and the shoulder bar (65) are placed above the rod (40). The pawl (62) is composed of several parts which each have a particular function (Fig.l, Pl. 8). The main part of it is composed of a front face (75), of which 2 side folds 80 constitute the cheeks (76-1) and (76-2). through which the axis (63) passes. This front face (75) is slightly folded on its upper part to form a surface (74) on which an operator can exert pressure tending to tilt the assembly about the axis (63). The folding of this front face (75) is optional and the upper part of the front face (75) can remain straight. The lower part (70) of this face (75) is important: its function is to penetrate into the grooves of the rod (40) and to push on this rod (40) when the carriage (38) is moving. forward by action on the handle (35). It is in this circumstance that the shoulder strip (65) intervenes: its purpose is to block this lower part (70) during the pushing, so that the front face (75) does not go backward and is maintained in a vertical position. The grooves of the rod (40) may be conical (Fig. 3, Fig. 8) or straight (Fig. 4 and 5, Fig. 8). The 2 cheeks (76-1) and (76-2). are folded back to form the face (72). The face (72) must make a certain angle "a" with respect to the front face (75). The bottom of this face (72) constitutes the edge (71) against which the free portion of the pin (64) bears when the front face (75) is in the vertical position. The difference in height between the edge (71) and the axis (63) (situated slightly lower), makes the pin (64) by pressing the edge (71). pushes forward, and keeps the ratchet upright. 100 It is possible to tilt the ratchet backwards and hold it in this position, by pressing the part (74). until the face (72) is placed against and parallel to the free portion of the pin (64). It is the angle "a" made by the face (72) with the face (75), which determines the distance between the lower part (70) of the rod (40). The more this angle is open, the lower the lower part (70) is raised with respect to the rod (40) (Fig. 1, Fig. 2, 2a, Fig. 8). Returning the pawl to the upright position (and holding it in this position) is done by pushing the face (74) forward until the ridge (71) is alone in contact with the free portion of the ratchet. the pin (64) (Fig.l bis PI 8). 110 A tube (68) is forcibly placed on the front portion of the carriage (38). Slightly flared at both ends, its role is to cancel the "saw" effect produced during the passage of the grooving of the rod (40) in the opening made on this face of the carriage (38).

B) FONCTIONNEMENT. 115 1) utilisation d'une double éclisse (45) (Pl. 1, 2, 3, 4). Le tube (25) est vissé sur l'élément de couplage (49) et devient lié au corps de la pince (26). La double éclisse (45) est relevée, permettant ainsi à la tige (40) de coulisser librement à travers le chariot (38). 120 La tige (40) est vissée sur le cylindre (34) du piston (32) par action sur la molette (44) qui est ensuite tirée en arrière jusqu'à ce que le centreur de liaison (34) vienne buter sur l'élément de couplage (49) (Fig. 1 et Ibis, P1.1). Une pression sur le plot mobile (27) met celui-ci en contact avec le plot fixe (28). Dans cette position. leur partie saillante (29) et (30) peuvent pénétrer à l'intérieur du 125 cylindre de tête (3) (Fig. 2, PI. 1). -5- Après que les 2 parties saillantes (29) et (30) soient passées sous la couronne (5), la pression peut cesser et le plot (27) remonte à sa position initiale bloquant ces parties (29) et (30) sous la couronne (5) de la cheville sans possibilité de retrait (Fig. 3, Pl. 1). Une poussée sur la molette (44) vers l'avant, fait passer le piston (32) entre les faces 130 internes des plots (27) et (28) jusqu'à ce qu'il vienne buter sur le cylindre d'écrou (4). La double éclisse (45) est alors abaissée, pour faire pénétrer les mâchoires (46) dans les rainures (47) et provoquer la solidarisation du chariot (38) avec la tige (40) (Fig. 1 et Ibis, Pl. 3). En l'état, le dispositif est prêt pour la mise en recul du cylindre d'écrou (4). B) OPERATION. 115 1) use of a double splice (45) (Pl. 1, 2, 3, 4). The tube (25) is screwed onto the coupling member (49) and becomes bonded to the body of the clip (26). The double splice (45) is raised, thus allowing the rod (40) to slide freely through the carriage (38). 120 The rod (40) is screwed on the cylinder (34) of the piston (32) by action on the wheel (44) which is then pulled back until the connection center (34) abuts on the coupling element (49) (Fig. 1 and Ibis, P1.1). Pressure on the movable stud (27) puts it in contact with the fixed stud (28). In this position. their protruding part (29) and (30) can penetrate inside the head cylinder (3) (Fig. 2, PI.1). After the two projecting parts (29) and (30) have passed under the ring (5), the pressure can cease and the stud (27) rises to its initial position blocking these parts (29) and (30). under the crown (5) of the ankle without the possibility of withdrawal (Fig. 3, Fig. 1). Pushing on the wheel (44) forwards, the piston (32) passes between the internal faces 130 of the studs (27) and (28) until it abuts on the nut cylinder ( 4). The double splint (45) is then lowered, to make the jaws (46) penetrate into the grooves (47) and to cause the carriage (38) to engage the rod (40) (Fig. 1 and Ibis, Fig. 3). . In the state, the device is ready for the setting back of the nut cylinder (4).

135 Deux forces simultanées et antagonistes appliquées pour l'une sur la poignée mobile (35) et pour l'autre sur la poignée de corps (48), et tendant à les rapprocher l'une de l'autre, mettent le chariot (38) en mouvement ainsi que la tige (40) dont il est solidaire. La pression exercée sur la poignée (35) est répercutée au niveau des 2 bras (37-1) et 140 (37-2) de la queue (37) qui poussent sur le chariot (38) via l'axe (39). Le cylindre (67), qui recouvre l'axe (39), entre en rotation lors de la poussée et empêche un frottement destructeur entre les 2 bras de la queue (37) et l'axe (39) qui supporte la poussée et la transmet au chariot (38). Le mouvement de la tige (40) solidaire du chariot (38), provoque la mise en 145 mouvement du piston qui va faire reculer le cylindre d'écrou (4) jusqu'à sa position d'origine (Fig.1 et 1 bis. Pl. 4). (Ces 2 forces antagonistes appliquées aux 2 poignées (35) et (48) de la pince, sont répercutées pour l'une au niveau des parties saillantes (29) et (30), bloquées sous la couronne (5) et tendant à faire sortir la cheville vers l'extérieur, et pour l'autre au niveau 150 de la pointe du piston (32), dans le sens contraire, de l'extérieur vers l'intérieur). Une seule action sur les poignées (35) et (48) suffirait à faire faire à la pointe du piston (32) tout le chemin d'une seule traite, depuis sa position d'origine (avant sa pénétration entre les faces internes des plots (27) et (28)), jusqu'à sa position terminale, celle où le cylindre d'écrou (4) est dans sa position la plus reculée à savoir sa position 155 d'origine. Il faudrait dans ce cas, solidariser via la double ou la simple éclisse (45), la tige -6- (40) et le chariot: (38), raccourcir sensiblement la longueur de ce dernier (le chariot (38)), et allonger la course angulaire "C" de la poignée (35) (Fig. 1, Pl. 1). 135 Two simultaneous and opposing forces applied for one on the movable handle (35) and for the other on the body handle (48), and tending to bring them closer to each other, put the carriage (38) ) in movement and the rod (40) which it is secured. The pressure exerted on the handle (35) is reflected in the two arms (37-1) and 140 (37-2) of the tail (37) which push on the carriage (38) via the shaft (39). The cylinder (67), which covers the axis (39), rotates during the thrust and prevents a destructive friction between the two arms of the tail (37) and the axis (39) which supports the thrust and the transmits to the carriage (38). The movement of the rod (40) integral with the carriage (38), causes the movement of the piston 145 which will roll back the nut cylinder (4) to its original position (Fig.1 and 1a) Pl.4). (These 2 antagonistic forces applied to the two handles (35) and (48) of the clamp, are reflected for one at the projecting portions (29) and (30), locked under the crown (5) and tending to make pull out the pin outwards, and for the other at the level 150 of the piston tip (32), in the opposite direction, from the outside to the inside). A single action on the handles (35) and (48) would be enough to make the tip of the piston (32) all the way in one go, from its original position (before its penetration between the internal faces of the pads (27) and (28)), to its end position, that where the nut cylinder (4) is in its most retracted position namely its original position 155. In this case, it would be necessary to secure, via the double or the single splint (45), the rod -6- (40) and the carriage: (38), to shorten substantially the length of the latter (the carriage (38)), and lengthen the angular travel "C" of the handle (35) (Fig. 1, Fig. 1).

2) Utilisation du cliquet (62) (Pl. 7, 8, 9, 10, 11) 160 Le tube (25), est vissé sur l'élément de couplage (49) et devient lié au corps de la pince (26) (Fig. 1 et l bis, Pl. 7). Le cliquet (62) est relevé. permettant à la tige (40) de coulisser librement à travers le chariot (38). La partie basse (70) de la face avant (75) du cliquet (62), est ainsi dégagée du 165 rainurage de la tige (40) (Fig. 2 et 2bis, P1. 8 ainsi que Fig. 1 et Ibis, Pl. 9). La tige (40) est vissée sur le cylindre (34) du piston (32) en tournant la molette (44) qui est ensuite tirée en arrière jusqu'à ce que le centreur de liaison (34) vienne buter sur l'élément de couplage (49) (Fig. 1 et Ibis. Pl. 7). Une pression sur le plot mobile (27) met celui-ci en contact avec le plot fixe (28). 170 Dans cette position. leur partie saillante (29) et (30), peuvent pénétrer à l'intérieur du cylindre de tête (3) (Fig. 2, Pl. 7). Après que les 2 parties saillantes (29) et (30) soient passées sous la couronne (5), la pression peut cesser et le plot (27) remonte à sa position initiale bloquant ces parties (29) et (30) sous la couronne (5) de la cheville sans possibilité de retrait (Fig. 3, Pl. 7). 175 Une poussée sur la molette (44) vers l'avant, fait passer le piston (32) entre les faces internes des plots (27) et (28) jusqu'à ce qu'il vienne buter sur le cylindre d'écrou (4). Il n'est cependant pas nécessaire de mettre le cliquet en position haute pour mettre en mouvement la tige (40) et amener le piston (32) en butée sur le cylindre d'écrou (4). Pendant la poussée en effet, lorsque le cliquet (62) est abaissé (la face avant (75) est 180 alors en position verticale). chaque pic (69) du rainurage de la tige (40) relève la base (70) du cliquet et chaque creux (77). de part l'action de l'épingle (64) sur l'arête (71), la fait descendre (PL 8). Par poussée dans ce cas. il faut entendre celle provoquée par une pression sur la molette (44) et non celle exercée sur le chariot (38) via la poignée (35) qui au contraire 185 provoque la solidarisation du chariot (38) avec la tige (40) par le blocage de la face avant (75) contre la barrette d'épaulement (65) (et le maintien de la partie basse (70) entre les dents du rainurage de la tige (40)). -7- Après que la pointe du piston (32) ait été mise en butée sur le cylindre d'écrou (4), en ayant ou non relevé le cliquet (62), la mise en recul du cylindre d'écrou (4) peut être 190 opérée. Deux forces simultanées et antagonistes appliquées pour l'une sur la poignée mobile (35) et pour l'autre sur la poignée de corps (48). et tendant à les rapprocher l'une de l'autre, mettent le chariot (38) en mouvement ainsi que la tige (40) dont il est solidaire. 195 La pression exercée sur la poignée (35), est répercutée au niveau des 2 bras (37-1) et (37-2) de la queue (37), qui poussent sur le chariot (38) via l'axe (39). Cette poussée est transmise au cliquet (62) dont la partie (70) de la face avant (75) est prise entre les dents du rainurage de la tige (40). La barrette d'épaulement (65) empêche le recul de la face avant (75) et maintient la 200 partie basse (70) entre les dents du rainurage de la tige (40), en permettant la poussée du chariot (38) sur la tige (40). Le mouvement de la tige (40), solidaire du chariot (38), provoque la mise en mouvement du piston qui va faire reculer le cylindre d'écrou (4) jusqu'à sa position d'origine (Fig. l et 1 bis. Pl. 1 1). 2) Using the pawl (62) (Pl. 7, 8, 9, 10, 11) 160 The tube (25) is screwed onto the coupling element (49) and becomes bonded to the body of the pliers (26) (Fig. 1 and 1a, Fig. 7). The pawl (62) is raised. allowing the rod (40) to slide freely through the carriage (38). The lower part (70) of the front face (75) of the pawl (62) is thus disengaged from the grooving of the rod (40) (Figs 2 and 2a, P1, 8 as well as Fig. 1 and Fig. 1). 9). The rod (40) is screwed onto the cylinder (34) of the piston (32) by turning the knob (44) which is then pulled back until the connection center (34) abuts on the element coupling (49) (Fig. 1 and Fig. 7). Pressure on the movable stud (27) puts it in contact with the fixed stud (28). 170 In this position. their protruding part (29) and (30) can penetrate inside the head cylinder (3) (Fig. 2, Fig. 7). After the two projections (29) and (30) are passed under the crown (5), the pressure can cease and the stud (27) back to its initial position blocking these parts (29) and (30) under the crown (5) ankle without the possibility of withdrawal (Fig. 3, Fig. 7). 175 A push on the wheel (44) towards the front, makes the piston (32) pass between the internal faces of the studs (27) and (28) until it abuts on the cylinder of nut ( 4). However, it is not necessary to put the pawl in the up position to move the rod (40) and bring the piston (32) abutted on the nut cylinder (4). During the pushing effect, when the pawl (62) is lowered (the front face (75) is then 180 in the vertical position). each peak (69) of the grooving of the rod (40) raises the base (70) of the pawl and each recess (77). by the action of the pin (64) on the edge (71), down (PL 8). By pushing in this case. it is necessary to hear that caused by a pressure on the wheel (44) and not that exerted on the carriage (38) via the handle (35) which on the contrary 185 causes the carriage (38) to be secured to the rod (40) by the locking the front face (75) against the shoulder bar (65) (and maintaining the lower part (70) between the teeth of the groove of the rod (40)). After the point of the piston (32) has been abutted on the nut cylinder (4), with or without raising the pawl (62), the setting back of the nut cylinder (4) can be operated. Two simultaneous and opposing forces applied for one on the movable handle (35) and for the other on the body handle (48). and tending to bring them closer to each other, put the carriage (38) in motion and the rod (40) which it is integral. The pressure exerted on the handle (35) is reflected in the two arms (37-1) and (37-2) of the tail (37), which push on the carriage (38) via the axle (39). ). This thrust is transmitted to the pawl (62), the portion (70) of the front face (75) is taken between the grooving teeth of the rod (40). The shoulder bar (65) prevents recoil of the front face (75) and maintains the bottom portion (70) between the groove teeth of the rod (40), allowing the carriage (38) to push on the rod (40). The movement of the rod (40), integral with the carriage (38), causes the movement of the piston which will roll back the nut cylinder (4) to its original position (Figures 1 and 1a). Pl.1 1).

205 L'utilisation du cliquet permet, tout comme l'utilisation des éclisses, de faire faire au piston (32) tout le parcours, depuis sa position la plus reculée (position du cylindre centreur (34) contre l'élément de liaison (49)), jusqu'à sa position la plus avancée (la position du cylindre d'écrou (4) après qu'il ait été mis en recul). Mais alors que ce parcours, lorsque une éclisse est utilisée, ne peut coïncider 210 qu'avec un seul et unique parcours angulaire "C" de la poignée (35), obligeant comme il a été dit supra d'allonger à l'extrême cette course angulaire "C", il est possible, grâce à l'utilisation d'un cliquet, de mettre en mouvement le piston (32) sur la totalité de son parcours grâce à plusieurs actions successives sur les poignées (35) et (48) et de donner ainsi à la poignée (35) une course angulaire "C" raisonnable. 215 Plus précisément. l'effet "cliquet" mis en jeu permet de pousser sur la tige (40) en plusieurs pressions sur la poignée (35), dont chacune est suivie par un relâchement de la poignée (35) permettant à celle-ci de revenir en arrière sous l'action du ressort (50), et de faire reculer le chariot (38) dont elle est solidaire sans que ce dernier n'entraîne avec lui -8- la tige (40). puisque dans le sens du recul, la partie basse (70) du cliquet sort des dents 220 du rainurage de la tige (40) et "navigue" alternativement sur les pics (69) et les creux (77) de celui-ci. Le retour en arrière du chariot (38) sans mettre en mouvement la tige (40), autorise une nouvelle action sur la poignée (35), qui pousse à nouveau le chariot vers l'avant en transmettant la poussée au cliquet qui se bloque contre la barrette d'épaulement (65) 225 pour agir sur la tige (40) et faire poursuivre au piston une course déjà commencée lors de la précédente action sur la poignée. The use of the ratchet makes it possible, just like the use of the fishplates, to make the piston (32) travel all the way from its most retracted position (position of the centering cylinder (34) against the connecting element (49). )), to its most advanced position (the position of the nut cylinder (4) after it has been set back). But while this course, when a splint is used, can coincide 210 with only one single angular path "C" of the handle (35), obliging as it was said supra to extend to the extreme this angular stroke "C", it is possible, thanks to the use of a ratchet, to move the piston (32) over its entire course through several successive actions on the handles (35) and (48) and thereby to give the handle (35) a reasonable angular stroke "C". 215 More precisely. the effect "ratchet" put into play allows pushing on the rod (40) in several pressures on the handle (35), each of which is followed by a release of the handle (35) allowing it to return back under the action of the spring (50), and back the carriage (38) which it is integral without the latter does not lead with him -8- the rod (40). since in the direction of recoil, the lower part (70) of the pawl out teeth 220 of the grooving of the rod (40) and "navigates" alternately on the peaks (69) and the recesses (77) thereof. The return of the carriage (38) without moving the rod (40), allows a new action on the handle (35), which pushes the carriage forward by transmitting the thrust to the ratchet that hangs against the shoulder bar (65) 225 to act on the rod (40) and to continue to the piston a stroke already begun during the previous action on the handle.

II) OUTIL DE POSE (Pl. 5, 6, 11, 12). La pose des chevilles met en jeu 2 éléments du dispositif, à savoir le corps de pince (26) et un autre élément solidaire de ce corps (26) appelé butoir (51). 230 Le tube (25) du dispositif peut-être enlevé ou maintenu. II) INSTALLATION TOOL (Pl.5, 6, 11, 12). The installation of the dowels involves two elements of the device, namely the clamp body (26) and another element integral with the body (26) called bumper (51). 230 The tube (25) of the device can be removed or maintained.

A) PRESENTATION. L'élément appelé butoir (51) situé sur la partie postérieure du corps de pince (26), est mobile autour d'un axe (52) fixé sur les 2 joues gauche et droite de ce corps (26). Ce butoir (51) peut être mis à l'horizontale et goupillé dans cette position dans 235 l'orifice (53) (Fig.l et 1 bis, P1. 5). La face postérieure (54) du butoir (51) doit être positionnée contre la couronne (5) de la cheville que l'on veut extraire de son support (59) Cette face (54) est munie d'une encoche (56), qui permet le passage de vis de différents diamètres (Fig. 2, Pl. 5). 240 La molette (44) de la tige (40) est dotée de 2 encoches (55) mises en vis à vis et placées de chaque coté de la tige (40). La forme ogivale de ces encoches (55), permet le passage d'un certain nombre de vis de différents diamètres. sans toutefois permettre le passage de leur tête. A) PRESENTATION. The so-called bumper element (51) located on the posterior part of the clamp body (26) is movable about an axis (52) fixed on the left and right 2 cheeks of this body (26). This bumper (51) can be horizontally and pinned in this position in the orifice (53) (Fig. 1 and 1a, P1, 5). The rear face (54) of the bumper (51) must be positioned against the ring (5) of the peg that is to be extracted from its support (59). This face (54) is provided with a notch (56). which allows the passage of screws of different diameters (Fig. 2, Fig. 5). 240 The wheel (44) of the rod (40) is provided with 2 notches (55) placed opposite and placed on each side of the rod (40). The ogival shape of these notches (55), allows the passage of a number of screws of different diameters. without allowing the passage of their head.

B) FONCTIONNEMENT. 245 1) Utilisation d'une double ou simple éclisse (Pl. 5 et 6). La poignée (35) est relâchée et la double Eclisse (45) est abaissée pour solidariser le chariot (38) et la tige (40). -9- Le chariot (38) est alors dans sa position la plus reculée, contre la paroi postérieure du corps de pince (26). 250 Dans cette position, le butoir (51) englobe alors la molette (44) qui se trouve presque plaquée contre la face postérieure (54) de celui-ci (distance "d") Une vis (57) est vissée dans le cylindre d'écrou (4) d'une cheville, et un espace de 5 à l Omm est laissé entre la couronne (5) et la tête de la vis (58). Cet espace doit être supérieur à la distance "d" qui sépare la molette (44) et la face 255 postérieure (54). Une encoche de la molette (44) et l'encoche de la face (54) du butoir (51) sont glissées sous le corps (57) de la vis. entre la tête (58) et la couronne (5) de la cheville (Fig.l et 1 bis, Pl. 5) Deux forces simultanées et antagonistes appliquées aux poignées (35) et (48) de la 260 pince et tendant à les rapprocher l'une de l'autre, provoquent la mise en mouvement du chariot (38) et de la tige (40) qui supporte la molette (44) avec pour conséquence le pliage et l'expansion des pattes (6) de la cheville contre la partie interne du support (59). Les 2 forces antagonistes appliquées aux poignées (35) et (48) de la pince, sont répercutées pour l'une au niveau de la tête de la vis (58) et par la même sur le cylindre 265 d'écrou (4) tendant à amener celui-ci contre le support (59), et pour l'autre au niveau de la face (54) du butoir tendant à plaquer celle-ci contre la couronne (5) de la cheville (Fig. 1 et 1 bis,. Pl. 6). B) OPERATION. 245 1) Use of a double or single splice (Plate 5 and 6). The handle (35) is released and the double Eclisse (45) is lowered to secure the carriage (38) and the rod (40). The carriage (38) is then in its most retracted position, against the posterior wall of the clamp body (26). 250 In this position, the bumper (51) then includes the wheel (44) which is almost pressed against the rear face (54) thereof (distance "d") A screw (57) is screwed into the cylinder d nut (4) of an ankle, and a gap of 5 to 10 mm is left between the ring (5) and the head of the screw (58). This space must be greater than the distance "d" between the wheel (44) and the rear face 255 (54). A notch of the knob (44) and the notch of the face (54) of the stopper (51) are slid under the body (57) of the screw. between the head (58) and the crown (5) of the ankle (Fig.l and 1a, Pl. 5) Two simultaneous and opposing forces applied to the handles (35) and (48) of the clamp 260 and tending to the moving closer to one another, cause the carriage (38) and the rod (40) which supports the wheel (44) to move, with the consequence of folding and expanding the tabs (6) of the ankle against the inner part of the support (59). The two opposing forces applied to the handles (35) and (48) of the clamp, are reflected for one at the head of the screw (58) and the same on the cylinder 265 nut (4) tending to bring it against the support (59), and for the other at the face (54) of the stopper tending to press it against the ring (5) of the pin (Figures 1 and 1a, Plate 6).

2) Utilisation d'un cliquet (62). Le butoir (51) est relevé et goupillé dans cette position dans l'orifice (53) du corps 270 de pince (26). Le cliquet (62) est relevé, désolidarisant ainsi le chariot (38) de la tige (40). La poignée (35) est relâchée et le chariot (38) est alors dans sa position la plus reculée, contre la paroi postérieure du corps de pince (26). La molette (44) est tirée en arrière et mise contre la face postérieure (54) du butoir 275 (51). Le cliquet (62) est abaissé et la tige (40) est solidaire à nouveau du chariot (38). Une vis (57) est vissée dans le cylindre d'écrou (4) d'une cheville, et un espace de 5 à 10mm est laissé entre la couronne (5) et la tête de la vis (58). -10- Cet espace doit être supérieur à la distance "d" qui sépare la molette (44) et la face 280 postérieure (54). Deux forces simultanées et antagonistes appliquées aux poignées (35) et (48) de la pince et tendant à les rapprocher l'une de l'autre, provoquent la mise en mouvement du chariot (38) et de la tige (40) supportant la molette (44) avec pour conséquence le pliage et l'expansion des pattes (6) de la cheville contre la partie interne du support (59). 2) Using a pawl (62). The bumper (51) is raised and pinned in this position in the hole (53) of the clamp body 270 (26). The pawl (62) is raised, thus disengaging the carriage (38) from the rod (40). The handle (35) is released and the carriage (38) is then in its most retracted position, against the posterior wall of the clamp body (26). The wheel (44) is pulled back and placed against the rear face (54) of the stopper 275 (51). The pawl (62) is lowered and the rod (40) is secured to the carriage (38) again. A screw (57) is screwed into the nut cylinder (4) of a plug, and a gap of 5 to 10mm is left between the ring (5) and the head of the screw (58). This space must be greater than the distance "d" between the wheel (44) and the rear face 280 (54). Two simultaneous and opposing forces applied to the handles (35) and (48) of the clamp and tending to bring them closer to one another, cause the carriage (38) and the rod (40) supporting the carriage to move. wheel (44) with the consequence of folding and expanding the tabs (6) of the ankle against the inner part of the support (59).

285 Les 2 forces antagonistes appliquées aux poignées (35) et (48) de la pince, sont répercutées pour l'une au niveau de la tête de la vis (58) et par la même sur le cylindre d'écrou (4) tendant à amener celui-ci contre le support (59), et pour l'autre au niveau de la face (54) du butoir tendant à plaquer celle-ci contre la couronne (5) de la cheville.285 The two opposing forces applied to the grips (35) and (48) of the clamp, are reflected for one at the head of the screw (58) and the same on the nut cylinder (4) tending to bring it against the support (59), and for the other at the face (54) of the bumper tending to press it against the crown (5) of the dowel.

Claims

1) ambivalent device for the same object, the extraction and installation of anchors for hollow materials called "expansion" characterized in that it consists of a tube (25) of circular, rectangular or square section , adaptable on a clamp body (26) provided with two handles (35) and (48), one (35) of which is movable about an axis (36), and an expansion stop (51) placed at the rear of this clamp body (26) (Fig. 1 and 1a, Fig. 1), and that on the one hand, the tube (25) and the clamp body (26) constitute the extraction tool, and in that on the other hand the clamp body (26) and the stopper (51) constitute the laying tool.

2) Device according to claim 1, characterized in that - the tube (25) is provided at one of its ends with 2 hooking studs (27) (28) placed opposite, each provided with 2 protruding portions (29) and (30), and at least one of which (27) is capable of penetrating inside the tube (25) through a pressure exerted by the operator contact with the inner face of the other and return to its initial position under the action of a return spring (31) (Fig. 2, Pl.

1), in that, the two projecting parts (29) (30), when the internal faces of the pads (27) (28) are brought into contact, are able to pass through the opening of the ring (5) , to penetrate inside the head cylinder (3), to be pressed against the wall of the latter when the pressure on the stud (27) is released, and to abut under the crown (5) (Fig. 3, Pl. 1), in that a piston (32) movable in the tube (25) can, for a thickness "e" and an appropriate width "L", pass between the studs (27) (28). when these have their protruding part in contact with the inner wall of the head cylinder (3) under the crown (5), and abut on the nut cylinder (4) (Fig. 1 and 1a, P1.

3), in that the presence of the piston (32) between the inner faces of the studs (27) and (28) keeps the projections (29) and (30) pressed against the wall of the head cylinder (3), under the crown (5) without possibility of withdrawal, - in that the outer end of the piston (32) is shaped tip capable of penetrating inside the nut cylinder (4) without being able to cross (Fig. Ibis, Plate 3, as well as Fig. 1a, Fig. 10). in that this outer end is held centered by a ring (33) placed in force in the tube (25), in that the other end of the piston (32) is provided with a cylinder. centralizer "(34), provided with a thread capable of receiving an external element (this cylinder (34) could be full and receive only the thrust of an external element without being secured to it). 3) Device according to claim 1, characterized: - in that it consists of a clamp body (26), provided with 2 handles, one fixed (48), the other (35) mobile around an axle (36) fixed on the two walls of this body (26) and held apart from each other by the spring (50), - in that a rod (40), threaded at one end ( 43) and provided with a wheel (44) to the other, crosses longitudinally, both the clamp body (26), and the carriage (38), - in that the rod (40) is free to slide in the two openings (41) and (42) formed on the anterior and posterior faces of the clamp body (26), - in that the carriage (38) can be secured to or detached from the rod (40), by the action of a single or double splice (45) (Fig. 1, ibis, 2, 2bis, Pl. 2) whose jaws (46) can be inserted in the grooves (47) of the rod (40) or in be removed at will by the operator (Fig.l and 1a, Pl. 1), - that the single or double ec rail (45) straddling the front portion of the carriage (38) is free to move up and down therealong, in that after the tube (25) has been fitted to the clamp body (26) ), and that the projections (29) and (30) have been placed under the crown (5), in the head cylinder (3), the piston (32) can be moved inside the tube ( 26) by a pressure on the wheel (44) exerted by the operator, and, when the carriage (38) is disengaged from the rod (40), pass between the inner faces of the pads (27) and (28) and ending inside the head cylinder (3) against the nut cylinder (4) (Fig. 1 and 1 Bis, Pl. 1 and FIG. 1 and 1 Bis, P1. 3) and in that position. when the carriage (38) and the rod (40) are secured, two opposing and simultaneous forces, applied to the two handles (35) and (48), tending to bring them together, cause the moving the carriage (38) via the handle tail (37) acting on the cylinder (67) and the axis (39) and thereby causing the rod (40) to move with the result, advancing the piston (32) into force in the tube (25), and setting the nut cylinder (4) back to its original position (Fig. 1 and 1 Bis, Pl.

4), - in that these 2 antagonistic forces applied to the 2 handles (35) and (48) lapince, are reflected for one at the protrusions (29) and (30) blocked under the crown (5) and tending to pull out the peg, and for the other at the piston tip (32), in the opposite direction, from the outside to the inside, - in that it is possible to to make the piston tip (32), in a single action on the handles (35) and (48), all the way in one go, from its original position (before its penetration between the inner faces of the pads (27) and (28)), to its terminal position. the one where the nut cylinder (4) is in its most retracted position: its original position. 4) Device according to claim 1 characterized in: - in that an element called ratchet (62), movable about an axis (63), is placed inside the carriage (38) (Fig.l and Ibis, Plate 7), in that the axis (63) is fixed on the two longitudinal walls of the carriage (38). - In that an element called shoulder strip (65) is likewise fixed on the 2 longitudinal walls of the carriage (38). in that a flexible element called a pin (64) which can be of flat section (FIG 8, FIG 8), or of circular section, is fixed on the shoulder strip (65), - in that in this case last case, the free part of the pin, is placed in a slot (73) made in the thickness of the shoulder strip (65), - in that the pawl (62) and the shoulder bar ( 65), are placed above the rod (40), - in that the pawl (62) is composed of several parts which each have a particular function (Fig.l, P1, 8), - in that the part main part of this element (62) is composed of a front face (75), of which 2 lateral folds constitute the cheeks (76-1) and (76-2), through which the axis (63) passes, - in what this front face (75). is slightly folded on its upper part to form a surface (74) on which an operator can exert pressure tending to tilt the assembly about the axis (63). The fold of this front face (75) is optional and the upper part of the front face (75) can remain straight, - in that the lower part (70) of this face (75) has the function of penetrating into the grooves the rod (40) and pushing on this rod (40) when the carriage (38) is-4 moved forward by action on the handle (35), - in that circumstance the bar of shoulder (65) allows to block this lower part (70) during the push, so that the front face (75) does not go back, and is maintained in a vertical position, - in that the grooves of the rod (40) can be tapered (Fig. 3, Fig. 8) or straight (Fig. 4 and 5, Fig. 8), in that the two cheeks (76-1) and (76-2). are folded back to form the face (72), - that the bottom of this face (72) constitutes the edge (71) against which the free portion of the pin (64) comes to bear when the front face (75) is in a vertical position and in that the difference in height between the edge (71) and the axis (63) (situated slightly lower) causes the pin (64) to exert pressure on the ridge (71), pushes forward, and keeps the ratchet upright, - that it is possible to tilt the ratchet backwards and maintain it in this position. by pressing the portion (74). until the face (72) is placed against and parallel to the free part of the pin (64), - in that the setting of the pawl in vertical position (and its holding in this position), is done in pushing the face (74) forward until the ridge (71) is alone in contact with the free portion of the pin (64) (Fig.) bis, P1. what a tube (68) flared at both ends. is placed in force on the front part of the carriage (38), - in that the ratchet effect (62), allows the securing of the rod (40) and the carriage (38), and thus the thrust on the rod ( 40), when action is taken on the handles (35) and (48) tending to bring them closer to each other, - in that the fastening disappears when a forward thrust is exerted on the wheel (44). in that when two simultaneous and opposing forces are applied for one on the movable handle (35) and for the other on the body handle (48), and tending to bring them closer to one another, one of them (that exerted on the movable handle (35)) is reflected in the two arms (37-1) and (37-2) of the tail (37), which push on the carriage (38) via the rotary cylinder (67) and the fixed axis (39), in that this thrust is transmitted to the pawl (62) whose front face (75) is taken between the teeth of the groove of the rod (40), in that the shoulder bar (65) prevents the recoil of the front face (75) and maintains the base (70) between the teeth of the groove of the rod (40), allowing the pushing the carriage (38) on the rod (40), - in that the movement of the rod (40) integral with the carriage (38), causes the movement of the piston (32) which will roll back the cylinder of nut (4) to its original position (Fig. 1 and Fig. 11), - and in that moreover. the effect "ratchet" put into play, allows to push on the rod (40) in several pressures on the handle (35), each of which is followed by a release of the handle (35) allowing it to return back under the action of the spring (50) and back the carriage (38) which it is integral, without the latter does not drive with him the rod (40), since in the direction of recoil, the lower part (70) ratchet comes out of the teeth of the groove of the rod (40) and "navigates" alternately on the peaks (69) and the recesses (77) thereof. - In that the return back of the carriage (38) without moving the rod (40), allows a new action on the handle (35), which pushes the carriage (38) forward transmitting the pushing the pawl (62) which locks against the shoulder bar (65) to act on the rod (40) and to continue to the piston a stroke already begun in the previous action on the movable handle (35).

5) Device according to claim 1. characterized in that it allows the installation of the dowels using a part of the elements used for their extraction, in that the installation of the dowels is possible using the two elements of securing the rod (40) and the carriage (38): the splint (45) and the pawl (62), - that the bumper (51). placed at the rear of the clamp body (26), movable about an axis (52), can be raised and maintained in a horizontal position, - in that the face (54) of the stopper (51), provided with a notch (56) allowing the passage of screws (57) of different diameters. is located behind the wheel (44) of the rod (40) and near it ("d"). when the carriage (38) integral with this rod (40) is in its most retracted position. against the posterior wall of the clamp body (26) (Fig. 1, 1a and 2, Fig. 5, as well as Fig. 1. Ibis, and 2, Fig. 12), - 6- - in that the thumb wheel (44) is provided with one or more notches (55) which can admit the passage of screws (57) of different diameters but block the passage of their head (58), - that it allows to put in the same axis, the notch (56) of the face (54) of the stopper (51) and the notch or one of the notches (55) of the wheel (44) to allow their positioning against the body (57) the screw engaged in the nut cylinder (4), between the head (58) thereof and the ring (5) of the pin (Fig. 1, Fig. 1a, and Fig. 2, Fig. 4), - in that 2 antagonistic forces applied simultaneously to the two handles (35) and (48) tending to bring them together, cause the rod (40) to move. on the one hand, and the screw body (57) on the other hand whose head (58) is engaged in the notch (55) of the wheel (44) and don the threaded end is screwed into the nut cylinder (4), with the consequence of folding the lugs (6) of the dowel and their expansion against the inner face of the support (59) (FIG. 1. and 1 bis, Pl. 5).