FR2628486A1 - DEVICE FOR LIGATING BARS, RODS OR THE LIKE USING A FLEXIBLE METAL WIRE - Google Patents

Abstract

The instant tying of longitudinal parts by means of portable pliers. The device comprises an upper nose piece 3 which can move in translation and a groove for holding the bars to be tied formed by a fixed lower nose piece 2 and a guide 4 for the upper nose piece in the form of a fork. The mobile nose piece 3 is stressed by a spring 29 in the direction of the lower nose piece 2 and its end is provided with a gripping hook 16, such a roller connecting two spaced sheets, such that, the free end of the tying wire passing through the opening of the hook of the mobile nose piece, the wire is shaped into a loop around the bars to be tied 12, following their grouped perimeter exactly. It allows the tying of packets of bars, the packets being of varying volumes, because the binding works without preforming the wire into a loop using a template of fixed dimensions.

Description

1 - Z2628486

  The present invention relates to a portable device or clamp for ligation of bars, rods or the like by means of a flexible wire.

  The function of these devices is the instantaneous ligation of long parts.

  such as bars, rods or rods for reinforcing reinforced concrete, wire mesh on wire tensioners, electric cables

  in bundled bundles or branches of plants on stakes son.

  In general, such tongs find application in the

  public works, transport and handling, fencing and

agriculture or gardening.

  According to the usual methods, use is made of universal tweezers or pincers used by hand to ligate bars with a wire wire which are surrounded by wire whose ends are twisted by repeated rotations of the forceps to the force of the wrist. This method is

slow, inconvenient and unprofitable.

  There are also known clamps comprising a rotating drill on hand pull handle, whose end engages in both loops

  closed with a piece of metal wire, mechanically

  alable, and that one arranged in semicircle around the bars to bind.

  The traction performed on the handle causes the rotation of the drill and the formation of the twist of wire that binds the bars. This

  method is also very slow and tiring.

  Other clamps have the disadvantage already indicated, namely the thread

  to bind must be previously looped in a head of way-

  suitable swimming of standard dimensions, which can only be applied for

  a given volume of bars to be ligated.

  The object of the present invention is to overcome such a disadvantage by

  the need for prior shaping of the wire on a standard

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  It relates more particularly to a device for ligation of bars, rods or the like by means of a flexible wire, provided with a torsion head and means for driving it in rotation, pliers or shears and means wire feeder and which is characterized in that it comprises an upper spout movable in translation and a groove for setting the bars to be bonded formed by a fixed lower spout and a guide of the upper fork-shaped spout, the spout upper being biased by means of a spring towards the lower spout and its end being constituted by a gripping hook, so that, the free end of the ligature thread passing through the hook opening of the movable spout,

  the wire is shaped as a loop around bars to be tied, when

  that the movable nozzle circumvents the bars to be bonded, its conformed end

  in hook applying the wire against the bars to be tied, following exactly

their grouped perimeter.

  Thus, the ligature head having no guide or template for

  loop, it can be flat, thus making it possible to

  to kill ligatures in places that are not very accessible, such as angles, and in all positions, cross or parallel. The strapping of the ligature is made according to the invention by bypassing the bars to be bonded and not by the preforming of a loop in a gauge head of fixed dimensions. Furthermore, the tightening of the loop thread around the bars to be bonded is

  constant, because the hook of the movable spout tends the thread by jamming slipped.

  The distance between the bars and the rotating head remains the same, hence a virtually identical twist for all ligatures, regardless of the volume of the bars to bind. In this way, two steels with a diameter of 6 mm or three steels with a diameter of 20 mm can be ligated identically, as long as the length of the wire delivered for the ligation is

  sufficient for the maximum capacity of the ligating clamp.

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  According to one embodiment of the clamp according to the particular invention-

  Advantageously, the movable upper spout consists of two parallel sheet metal plates, spaced apart from each other by a gap greater than the diameter of the wire used to bind, a roller connecting the two plates to the front end of the spout and serving as a hook. grasping and pulling

ligature wire.

  This roller ensures the maintenance of the tension of the thread around the package to bind by sliding wedge, when the spout describes a path bypassing

said packet.

  Advantageously, the torsion head may have an internal bore.

  to receive the lower strand of the wire, parallel to the longitudinal axis

  tudinal of the torsion head and a slot along the generatrix located in the diametral plane of the bore to receive the upper strand of the wire, with locking pawl preventing the exit of the strand during

of the rotation.

  The guide of the wire towards the hook of the movable spout can be ensured by a

  middle groove in the fixed lower spout.

  According to an advantageous embodiment, the clamp comprises two jacks.

  The first serves to ensure the translational movement back and forth of the movable spout and the end of its rod is articulated on the end

rear of movable upper spout.

  The second cylinder ensures the rotational drive of the torsion head,

  the cylinder rod exerting a thrust on a slider mounted on a spindle screw

  ruled several turns secured to the torsion head.

  The cylinders, preferably pneumatic, can be ordered

by a sequential control panel.

  Other particular features of the invention will emerge in the light of the

  description of an embodiment of the forceps presented as an example

  FIG. 1 shows a sectional and elevational view of the clip,

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  Figure 2 is a perspective view of the ligation head, Figure 3 is a side sectional view of the ligation head; and Figure 4 is a top view of the ligation head, the movable spout.

being dismounted.

  The housing 1 of the forceps, which can be made of injected plastic material, houses the various mechanical parts that will be discussed and then away, and then forms at the front, on the one hand, the fixed lower spout 2 and, on the other hand,

  the guide of the upper spout 4 fork-shaped.

  The beak 2 and the guide 4 form a groove, at the bottom of which is placed

  staking the bars or rods to bind 12.

  The upper spout movable in translation 3, guided in the fork of the spout 2, consists of two cut sheet plates, parallel and spaced apart

  between them a space greater than the diameter of the ligature wire. The extré-

  the beak has an axis 16 connecting the two plates and carrying a

rotary roller.

  The spout 3 is articulated at 5 at the end of the rod 6 of a jack 9 and a spring 29 urges the spout 3 towards the lower spout 2 and its

  pressure tends to forcefully apply the spout 3 on the bars to be bonded.

  The lower spout 2 consists of three contiguous sheet metal plates

  the recessed central plate creates a groove 25 for the pas-

wise of the ligature wire.

  Inside the casing 1 are housed two pneumatic cylinders 7 and 9,

  and a coil 13 of the annealed steel ligation wire.

  The jack 7 ensures by means of its rod 6 the comings and goings of the movable spout 3

  articulated in 5 to this rod, the axis of the articulation 5 being guided horizontally

  by a rail secured to the casing 1.

  The cylinder 9 ensures both the feeding of the device with wire of liga-

  ture and rotational drive of the torsion head 17.

  The supply system of the. ligature wire includes a train of

  three notched rollers 14 moved by gears pushed by a cremaill-

  unrepresented lere actuated by the jack 9 and a guide tube 15.

  The rollers exert a pressure on the wire that slides on a skate

  made of self-lubricating plastic material.

  During the return movement of the cylinder, the rollers are disengaged by means of

  a ratchet on the gears to prevent the return of the wire back.

  Above the lower spout 2 is fixed by means of suitable bearings not shown a torsion head 17 integral with a spiral screw 21 several turns. On said screw 21 is mounted a slider 20 fixed on the end of the rod 8 of the cylinder 9. Thus, during the displacement of the rod, the torsion head 17 accomplishes several revolutions around

of its axis.

  The torsion head 17 consists of a cylinder comprising a piercing

  Longitudinal axis parallel to the axis intended to pass the

  ligation wire. On the top of the cylinder, along the gen-

  diametrically opposed to the bore 27, is a slot 28 provided with a locking pawl 30 and intended to receive the strand

upper ligation wire.

  A wire cutter 19 is disposed flush with the inner face of the twisting head 17 to cut the two strands of wire. It consists of two jaws 26 working in opposition and leaving between them a recess for the passage of the spiral screw 21 causing rotation

torsion head 17.

  The end of the rod of the jack 9 comprises a cam which spreads the two

  arm of the shears 19 sliding between the two bosses located in the

  inside the arms. This spacing causes the cutting of the two strands of wire.

  Both cylinders are preferably operated by a cylinder of compressed air at about 2 bar and their action is coordinated by a central

  sequential timer 10 ensuring the control of movements al-

tarnished and consecutive.

  The operation of the clamp is as follows.

  In the initial position at the end of the work cycle, the upper beak 3

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  is in the position shown in Figure 1, the bars 12 are placed at the bottom of the groove formed by 2 and 4, the clamp is supplied with

  ligature wire in coil 13 and the wire is engaged in the pushing pebbles

  wire 14 and in the guide tube of the wire 15 up to the shear 19.

  The ram 9 is actuated forwards, which causes the thrust of the wire coming out of the tube 15 as a result of the action of the notched rollers 14, penetrates into the bore 27 of the twist head 17 and follows the groove 25 until at

  the end of the spout 2. The action of the cylinder 9 stops temporarily there.

  Actuator 7 is actuated towards the rear of the clamp which pulls the upper spout 3 towards the rear. In retreating, the end of the wire is snapped by the upper spout 3 passing on the roller 16, the wire slides between the spaced plates of the spout and, the spout being forcefully applied downwards by the spring 5, it applies the wire ligature around bars to bind, forming the wedding strapping

  exactly the perimeter of the bundle of bars to bind.

  During its revolution around bars to be bonded, the upper strand of the loop thus formed penetrates into the upper slot 28 of the torsion head 17 and remains therein retained by the pawl 30, while the end

  spout 3 keeps the thread engaged in the torsion head 17.

  We stop the action of the cylinder 7 and actuates the cylinder 9 in the direction

opposed to his first move.

  At the beginning of the stroke, the jack pulls back the closing cam of the shear 19 and the two strands of the loop are cut. Then, this cam drives the slider 20 to the end of stroke, which ensures the rotation of the screw 21. The spiral screw rotating, the rotating head 17 e4 runs several turns which form the twist of the ligature 18, the two strands being braked. The ends of the two strands slide out

  d! the head 17 and the ligature is completed, the linked bars are released.

  The actuator 7 is actuated in the opposite direction, for example by means of a return spring, the rotation in the opposite direction of the head 17 is not

  embarrassing because the strands are no longer held by it.

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  The upper spout 3 is thus returned to its initial position, which allows to place in the groove of the fixed spout 2 bars to bind for the next ligature.

  The device according to the invention is lightweight and therefore portable.

  It allows to ligate wherever desired, only the size of the beaks of the clamp limits its use. It also allows fixed work. The materials used to manufacture the clamp are sheet metal elements and tubes, bent or welded together. Wear elements

  can be treated steel. Pneumatic components of the servo

  are those available on the market, such as the double cylinder

  effect and timing unit.

  The invention is not limited to the particular mode described, it is sus-

  can be many variations within the reach of those skilled in the art, without departing from the scope of the invention, particularly with regard to forms

  varied that can take the gripping hook 16.

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Claims (8)

  1. Device for ligation of bars, rods or the like by means of a flexible wire, provided with a torsion head and means for driving it in rotation, tongs or shears and means for feeding the device wire, characterized in that it comprises an upper spout (3) movable in translation and a groove for setting the bars to be bonded formed by a fixed lower spout (2) and a guide (4) of the upper spout in the form of fork, movable upper spout (3)   being biased by means of a spring (29) towards the lower beak   (2) and its end being constituted by a preheating hook   sion (16), so that, the free end of the ligature wire passing through the opening of the hook of the movable spout, the wire is shaped in a strapping loop around bars to bind (12), when the movable spout bypasses the bars to be bonded, its hook-shaped end applying the wire against the bars to be bonded, following exactly their grouped perimeter.   2. Device according to claim 1, characterized in that the movable upper spout (3) consists of two parallel sheet metal plates spaced apart by a gap greater than the diameter of the wire to be bonded, a roller (16) connecting to. the front end of the beak both   plates and serving as a hook for gripping and pulling wire of the liga-   ture. 3. Device according to claim 1, characterized in that the torsion head (17) has an inner bore (27) for receiving the lower strand of the wire, parallel to its longitudinal axis and a slot (28).   receiving the upper strand of the wire along the generator if-   killed in the diametral plane of the borehole with a locking latch wire (30).   4. Device according to claim 1, characterized in that the beak 9 2628486   lower section (2) has a longitudinal central groove (25) for the wire guidance.   5. Device according to one of claims 1 to 3, characterized in that   the mechanical means are actuated by two pneumatic cylinders (7, 9) controlled by a sequential timing unit (10).   6. Device according to claim 1, characterized in that the end   stem (6) of a first cylinder (7) is articulated on the end   rear turret of the movable upper spout in horizontal guided translation (3).   7. Device according to claim 1, characterized in that the means for rotating the torsion head (17) consist of   by a second jack (9) whose rod exerts a push on a   seur (20) mounted on a spiral screw (21) with several turns, secured the torsion head (17).   8. Device according to claim 7, characterized in that the rod of the second cylinder (9) comprises a cam which first spreads the two arms of the shear (19) causing the cutting of the two strands of the twisted wire, then, the cylinder continuing its stroke, the cam drives the slider (20)   which rotates the torsion head (17).