EP1810790A1 - Bivalent tool for extraction and placement of expanding metal anchor dowels for hollow material - Google Patents

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

The present invention relates to the extraction of anchors called "expansion" and follows that bearing No. 050020400 dated 10/01/05.

This invention adds a new tool to those previously described while relying on the same principles of operation.

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.1 and 1a, Pl.1, Fig. 1 and 1bis Pl. 7).

The tube (25) and the clamp body (26) constitute the extraction tool, the clamp body (26) and the stopper (51) constitute the laying tool.

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 at 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 of it thanks to 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 integral with the tube, is positioned opposite the first (27) and may be fixed or movable (Fig. 1 and 1a, Fig. 1, Fig. 1 and 1a). 7).

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 from way 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) 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 inside a carriage (38), wedged between an axis (39) fixed on the 2 longitudinal walls of this 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) which allows the end (43) to be screwed onto 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 1, 2, 3, 4, 5, 6), the second on the use of a ratchet (Plates 7, 8, 9, 10, 11, 12, 13).

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 to move up and down thereon, allows the sliding of the rod (40) or on the contrary blocking thereof ( and integral with the carriage), by inserting or withdrawing its jaws (46) into and out of the circular grooves (47) on the carriage rod (40).

The type of groove that can be used is that shown in FIG. 3, Plate 2.

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 move 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, Fig. 2), the carriage (38) becomes integral with the rod (40) and any pressure on the handle (35) causes it to move as well as that of the rod (40) (Fig. 1 and 1a, Fig. 3).

2) use of a ratchet (Plates 7, 8, 9, 10, 11).

An element called pawl (62), movable about an axis (63), is placed inside the carriage (38) (Fig.1 and 1a, Plate 7).

The axis (63) is fixed on the two longitudinal walls of the carriage (38).

An element called a shoulder strip (65) is likewise fixed on the two longitudinal walls of the carriage (38).

A flexible element called a pin (64) is attached to it, on the shoulder bar (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, Plate 8), or of 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 purpose of the slit (73) is to guide this free part in its movements when it is stressed (Fig. 1, 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. 1, Fig. 8).

The main part of it is composed of a front face (75), of which 2 side folds constitute the cheeks (76-1) and (76-2), through which passes the axis (63).

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 push on this rod (40) when the carriage (38) is moved towards the front by action on the handle (35).

It is in this circumstance that the shoulder bar (65) intervenes: its purpose is to block this lower part (70) during the pushing, so that the front face (75) does not go back 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 "α" 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) is supported 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 on the edge (71), pushes forward, and keeps the ratchet upright.

It is possible to tilt the pawl backwards and hold it in this position, by pressing the part (74), until the face (72) is placed against and parallel to the free part of the pawl. the pin (64).

This is the angle "α" that 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, 1a, 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.1bis, Plate 8).

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) OPERATION. 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).

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 connecting center (34) abuts on the element Coupling (49) (Figs 1 and 1a, P1.1).

Pressure on the movable stud (27) puts it in contact with the fixed stud (28). In this position their projection (29) and (30) can penetrate inside the head cylinder (3) (Fig. 2, Fig. 1).

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. 1).

Pushing the wheel (44) forward, the piston (32) passes between the inner faces 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 secure the carriage (38) with the rod (40) (Fig. 1 and 1a, Fig. 3). .

In the state, the device is ready for the setting back of the nut cylinder (4).

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 echoed at the two arms (37-1) and (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 which will roll back the nut cylinder (4) to its original position (Fig.1 and 1a. 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 the pin outwards, and for the other at the point of the piston (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.

In this case, it would be necessary to secure, via the double or the single splint (45), the rod (40) and the carriage (38), substantially shorten the length of the latter (the carriage (38)), and lengthen the angular stroke "C" of the handle (35) (Fig. 1, Fig. 1).

2) Using the pawl (62) (Pl. 7, 8, 9, 10, 11)

The tube (25) is screwed onto the coupling element (49) and becomes bonded to the body of the clamp (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) (Fig. 2 and 2a, Fig. 8 and Fig. 1 and 1a, Fig. 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 1a, Fig. 7).

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, 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).

Pushing the wheel (44) forward, the piston (32) passes between the inner faces of the studs (27) and (28) until it abuts on the nut cylinder (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, when the pawl (62) is lowered (the front face (75) is then in vertical position), each peak (69) of the grooving of the rod (40) raises the base (70) of the pawl and each depression (77), by the action of the pin (64) on the edge (71), makes it go down (Plate 8).

By pushing in this case, it is meant 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 causes the securing of the carriage (38) with the rod (40) by 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 tip of the piston (32) has been abutted on the nut cylinder (4), with or without raising the pawl (62), the retraction 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 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 (37-2) of the tail (37), which push on the carriage (38) via the shaft (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 keeps the lower part (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 (Fig.1 and 1a. Pl. 11).

The use of the ratchet allows, as the use of the fishplates, to make the piston (32) the entire path, 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 only with a single angular path "C" of the handle (35), obliging as it has been said supra to lengthen this race to the extreme angular "C", it is possible, through the use of a ratchet, to move the piston (32) on 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".

More specifically, the effect "ratchet" put stake 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 to back the carriage (3 8) 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) of the pawl emerges teeth of the grooving of the rod (40) and "navigates" alternately on the peaks (69) and the recesses (77) of this one.

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 strip (65) to act on the rod (40) and to continue to the piston a stroke already begun during the previous action on the handle.

II) TOOL FOR INSTALLATION (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).

The tube (25) of the device can be removed or maintained.

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 stop (51) can be placed horizontally and pinned in this position in the orifice (53) (Fig.1 and 1a, Pl.5).

The rear face (54) of the bumper (51) must be positioned against the crown (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).

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 heads.

B) OPERATION. 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).

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 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 (54).

A notch of the wheel (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.1 and 1a, Pl. 5)

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) which supports the wheel (44) 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 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 (Fig. 1 and 1a), 6).

2) Using a pawl (62).

The bumper (51) is raised and pinned in this position in the hole (53) of the clamp body (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 bumper (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 (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).

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 ring (5) of the ankle.

Claims (5)

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 section, rectangular or square, adaptable on a gripper body (26) provided with two handles (35) and (48), one of which (35) 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. Device according to claim 1, characterized - in that , the tube (25) is provided at one of its ends with 2 gripping studs (27) (28) placed opposite, each provided with 2 projecting portions (29) and (30) , and at least one of which (27) is capable, by pressure exerted by the operator, to penetrate inside the tube (25) until it comes into contact with the internal face of the other and to resume its initial position under the action of a return spring (31) (Fig. 2, Fig. 1), in that , the two projections (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, P1 .1) - In that a piston (32) movable in the tube (25) can, for a thickness "e" and a width "L" appropriate, pass between the pads (27) (28) when they have their part protruding in contact with the inner wall of the head cylinder (3) under the ring gear (5), and abutting on the nut cylinder (4) (Fig. 1 and 1a, Fig. 3), - in that the presence of the piston (32) between the inner faces of the studs (27) and (28) maintains 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 this piston (32) is in the form of a tip capable of penetrating inside the nut cylinder (4) without however being able to cross it (FIGS. Fig.1bis, Pl. 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 "centering" cylinder (34) provided with a thread capable of receiving an external element (this cylinder (34) could be full and not receive that the thrust of an external element without solidarization with it). 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) movable about an axis (36) fixed on the 2 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, passes 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 front and rear faces of the clamp body (26), - In that the carriage (38) can be secured or disengaged from the rod (40), by the action of a single or double splice (45) (Fig. 1, 1a, 2, 2a, P1. whose jaws (46) can be inserted into the grooves (47) of the rod (40) or removed at will by the operator (Fig.1 and 1a, Pl.1), - in that the single or double splint (45) straddling the front portion of the carriage (38) is free to go up or down along the latter, in that , after the tube (25) has been fitted to the clamp body (26), and the protrusions (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 of the rod (40), pass between the internal faces of the studs (27) and (28) and end up inside the head cylinder (3), against the nut cylinder (4) (FIGS. Bis, Pl.1 and Fig. 1 and 1 Bis, Pl. 3) and that, in this position, when the carriage (38) and the rod (40) are secured, 2 antagonistic and simultaneous forces, applied on the 2 handles (35) and (48), tending to bring them closer to one another, cause the carriage (38) to move, via the handle tail (37) acting on the cylinder (67) and the axis (39) and thereby the setting in motion of the rod ( 40) with the result that the piston (32) advances in force in the tube (25), and the nut cylinder (4) is moved back to its original position (FIG. 1 and 1 Bis, Pl. 4), in that these two antagonistic forces applied to the two handles (35) and (48) of the clip, are reflected for one at the protrusions (29) and (30) blocked under the crown (5) and tending to pull out the ankle, and for the other at the tip of the piston (32), in the opposite direction, from outside to inside, - in that it is possible to make the tip of the piston (32), in one 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 end position, the one where the nut cylinder (4) is in its most retracted position: its original position. Device according to claim 1, characterized by: - in that an element called pawl (62), movable about an axis (63), is placed inside the carriage (38) (Fig.1 and 1a, Plate 7), - In that the axis (63) is fixed on the 2 longitudinal walls of the carriage (38). in that an element called shoulder strip (65) is likewise fixed on the two 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 the latter 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 each of which has a particular function (FIG. 1, FIG. 8), - in that the 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 passes (63) - In that this front face (75) is slightly folded on its upper part to form a surface (74) on which an operator can exert a 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 of the rod (40) and of pushing on this rod (40) when the carriage (38) is moved forward by action on the handle (35), in that in this circumstance the shoulder strip (65) makes it possible to block this lower part (70) during the thrust, so that the front face (75) does not leave behind, and is kept in a vertical position, in that the grooves of the rod (40) can be conical (Fig. 3, Fig. 8) or straight (Fig. 4 and 5, Fig. 8), in that the two cheeks (76-1) and (76-2) are folded rearward to constitute the face (72), in that 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 a vertical position and in that the difference in height between the ridge (71) and the axis (63) (situated slightly lower), causes the pin (64) by pressing on the ridge (71), to push forward, and keeps the ratchet upright, - in that it is possible to tilt the pawl backwards and maintain it in this position, by pressing the portion (74), until the face (72) is placed against and parallel at the free part of the pin (64), - in that the reset of the pawl in vertical position (and its holding in this position), is done by pushing the face (74) forward until the ridge (71) is alone in contact with the free part of the pin (64) (Fig.1bis, Plate 8), - in that a tube (68) flared at its two ends, is placed in force on the front portion of the carriage (38), in that the ratchet effect (62) allows the rod (40) and the carriage (38) to be secured together, and thus the thrust on the rod (40), when the handles (35) are actuated (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 grooving teeth 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 thrust of 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 nut cylinder (4) to its original position ( Fig.1 and 1a, P1, 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 loosening of the handle ( 35) allowing it to go 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) of the pawl emerges from 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). 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 anchoring is possible by using the two securing elements of the rod (40) and the carriage (38): the splint (45) and the pawl (62), in that the bumper (51), placed at the rear of the gripper 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 placed 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 rearward position, against the rear wall of the clamp body (26) (Fig. 1, 1 bis and 2, P1, 5, as well as Fig. 1, 1a, and 2, P1. - in that the 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), - In 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) of the screw engaged in the nut cylinder (4), between the head (58) thereof and the ring (5) of the ankle (Fig. 1, Fig. 1a, and Fig. 2, Fig. 4), - in that 2 antagonistic forces applied simultaneously on the 2 handles (35) and (48) tending to bring them together, cause the setting in motion, the rod (40) 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 whose 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 1a, P1.5).

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