Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
  • E04G21/12—Mounting of reinforcing inserts; Prestressing
  • E04G21/122—Machines for joining reinforcing bars
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
  • E04G21/12—Mounting of reinforcing inserts; Prestressing
  • E04G21/122—Machines for joining reinforcing bars
  • E04G21/123—Wire twisting tools

Definitions

• the present invention relates to a method and a device allowing the assembly by ligature of two concrete irons by winding a ligature wire so that it makes a half loop around a first branch of a first iron each of strands of the wire passing around the second iron and overlapping the second branch of the first iron to be joined by twisting.
• the patent FR 1 371 109 also describes a pliers to tie, in which a wire is pushed to carry out a simple turn around two irons. This device also does not make it possible to carry out a dead turn around an iron, nor to cut the excess of wire after ligature.
• Patent FR 2 423 604 describes an automatic device making it possible to carry out ligation by entraining the wire by an articulated pliers substantially reproducing the movement of the worker's hand to pull the wire around the irons, the wire being then cut and the two strands joined together to form the trunnion.
• Such a design requires a complex mechanical device, in particular for the realization of the hinged clip to perform a movement, very complicated, so that these devices are bulky and heavy, and require support means gantry to allow movement.
• An object of the present invention is to provide a method and a device for making a very light ligature forceps, allowing its implementation without requiring support means for its movement. Portable tongs weighing only a few kilograms are thus read.
• Another object of the invention is to provide a fully automatic device for making ligatu ⁇ res from preformed staples.
• the invention makes it possible to produce a particularly reliable device and comprising a small number of moving mechanical parts, in particular avoiding the risks of bad winding of the wire around the irons, such windings being able to oblige the worker to cut the wire to release the clamp.
• the disposi ⁇ tif allows the production of ligatures with dead towers around one of the irons.
• the method consists in using staples made up of wire to be tied, and comprising a crosspiece and two arms substantially parallel and spaced apart by a distance greater than the diameter of one of the binding irons; the clip is advanced in the direction of the irons so that the free ends of these arms pass respectively on either side of the first branch of the first iron and around the second iron, and that the crosspiece of the staple comes to form a half loop around the first iron; during the advancement of the staple, the two arms are formed in an arc of a circle so that they wind respectively around each of the two branches of the second iron; the arms are straightened at the end of their path around the second iron, they are pulled to " tighten the wire until the crosspiece is placed around the first iron and the journal is made.
• a staple allows great speed because the two arms are actuated simultaneously for the passage around the irons.
• the movements to be performed are much simpler than because the use of an uncut wire.
• a staple can be used, one arm of which is longer than the other so that the longest arm makes a dead turn around the second iron during the winding phase ; the two arms can also make a dead turn around the second iron during this winding phase. Even for the execution of dead turns, the movements are relatively simple, so that a relatively simple automatic device can be designed for the implementation of this process.
• the device for ligating two concrete irons comprises means for guiding and positioning the device relative to the irons to be ligated, means for winding the wire so that it makes a half loop around a first branch of a first iron, each of the strands of the wire passing around the second iron and leaving on either side of the second branch of the first iron, and means for twisting the two strands leaving the wire;
• the device further comprises means for pushing a staple according to the method described above, the staple being positioned so that its arms pass on either side of the first branch of the iron, means cause the formation in an arc of a circle each of the two arms of the clip; means guide each of the arms along a curved path around the second iron on either side of the first iron, and means straighten each of the arms at the exit of the curved path to cause their penetration into means for twisting producing the formation of the journal.
• the winding of the two arms of the clip carried out simultaneously, makes it possible to carry out a ligature very quickly.
• the device further comprises means for pulling the arms before starting the twisting operation. This makes it possible to tension the wire around the irons to be tied up much more quickly, the wire not having to be shortened considerably during the operation of twisting.
• the means for positioning and pushing the clip comprise a pusher carriage bringing the clip into contact with driving rollers by translation in a guide slide 5, the driving rollers producing the pushing of the clip during the forming of these strands around the irons and their introduction into the means for twisting.
• the entrainment of the wire is therefore carried out practically only by the driving rollers, so that there is considerably reduced
• the means for guiding and positioning the device relative to the irons to be ligated comprise two parallel shoes intended to be positioned on either side of the first shoe, the shoes comprising transverse grooves which are inserted the second iron;
• pusher carriage comprises two lateral forks each comprising an upper branch and a lower branch; at the end of the carriage advance, when the clip is supported by the drive rollers, the forks engage between the shoes and hold the second iron in the
• the means for forming in an arc the arms of the clip comprise an annular groove formed in the groove transverse of each shoe in the extension of the side walls of the guide rail; these annular grooves cooperate with the thrust force imparted by the driving rollers to curve the arms of the staple and form a circle whose radius is greater than the radius of the irons to be ligged.
• the formation of a dead turn can thus be carried out for very different iron diameters.
• At least one of the annular grooves may have a width at least equal to twice the diameter of the wire forming the clip, the groove then being inclined in a slightly oblique plane relative to the axis of the transverse grooves; the staple arm is thus wound around the second iron in a helical movement, the pitch of which is substantially equal to the diameter of the wire, the width of the annular groove allowing the second passage of the wire after a dead turn around iron.
• the arm is guided around the second iron at the for ⁇ mation 'dead turn by providing an annular groove in sim ⁇ pho thickness, in continuation of the annular groove staggering ⁇ dual sor, and provided between the branches of the corresponding forked of the pusher carriage.
• the carriage, pusher thus has, in addition to its function of pushing the staple and holding the second iron to be tied, a function of guiding the wire during the formation of the dead turn.
• the means for straightening the arms after passing around the second iron comprise a removable straightening guide comprising a body extended by a lateral push rod, urged by drive means between a first position in which the rods are retracted to allow the passage of the wire to be ligated in the annular grooves, and a second position in which the ends of the rods form a stop and push each of the arms of the clip to cause its tangential exit- return to the transverse throat of the hooves.
• the straightening is therefore obtained by the cooperation of the removable guide with the thrust exerted on the arms of the clip by the driving rollers.
• the means for twisting the arms of the clip comprise a rotary turret, driven by a motor in rotation about an axis substantially parallel to the direction of exit of the arms after straightening, and comprising means for blocking of the ends of the arms>
• the turret is mounted on a mobile support urged by first drive means between a first position in which the turret is retracted to allow free access to the shoe, and a second position in which the turret is advanced so that its jaws are facing the transverse groove of the hooves;
• the movable turret support is further sol ⁇ licit by second drive means in the direction of moving towards or away from the transverse groove, so as to allow simultaneously to realize the means for pulling the arms of the clip before the pin formation.
• FIG. 1 shows a side view in section of the device according to the present invention in the rest position
• FIG. 2 shows a top view of the pusher carriage
• FIG. 3 shows a sectional view de.côté according to section I-I of Figure 2 j
• FIG. 4 shows a side view in section of the guide rail and a shoe?
• FIG. S shows a view t -.- insvei-sa.le in section of the guide rail;
• FIG. 6 shows a top view of the guide rail and the shoes
• FIG. 7 represents an embodiment of the staples according to the present invention.
• - Figure 8 shows a partial front view of two irons engaged in the device of the present invention and assembled by ligation after formation of the pin;
• - Figure 9 shows the same assembly during the phase of traction of the strands before formation of the journal;
• FIG. 10 shows a partial side view in section of the clamp according to the present invention during the pushing of the clip by the pusher carriage;
• FIG. 11 shows the same device, the clip being driven by the driving rollers and introduced into the rotary turret;
• FIG. 13 shows the device after formation of the journal and during the phase of cutting the journal and returning to the rest state.
• the method according to the present invention makes it possible to carry out a ligature around two concrete irons by using a staple.
• a clip 1 is shown in FIG. 7, and comprises a cross member 2 connecting two arms 3 and 4 substantially parallel.
• the arm 4 is substantially longer than the arm 3, and is intended to perform an additional dead turn around one of the irons to be assembled.
• FIGS. 8 and 9 there are shown in particular two irons to be assembled: a first iron 5 comprises a first vertical branch 6 and a second horizontal branch 7 separated by a bend which is not visible in the figures.
• a second shoe 8 is inserted inside the bend of the first shoe 5 in a substantially horizontal position and crossing the plane formed by the first shoe.
• a staple 1 is pushed from rear to front of FIGS. 8 and 9, the free ends of the arms 3 and 4 being directed towards the first iron in order to overlap this first iron 5 in steps. sant below the second iron 8 in the lower zone 9 shown in the figures.
• Each of the two arms of the clip is then curved to wrap around the second iron 8, then straightened to escape linearly as shown in the portions 10 of FIG. 9.
• the arm 4 is shown performing a dead turn 11 around the second iron 8, while the arm 3 only performs a quarter turn around the iron 8.
• the arms 3 and 4 are then pulled upwards so that the cross member 2 comes to press against the first branch 6 of the first shoe 5, then the arms 3 and 4 are twisted to form the pin 12 shown in FIG. 8.
• the device according to the present invention comprises a magazine 13 for containing staples pushed upwards by elastic means not shown in the figures.
• the staples are introduced one by one from bottom to top, by a vertical slide 14, in a thrust compartment.
• This compartment comprises a horizontal guide rail 15 having a bottom wall 16 and two side walls 17 and 18 between which is held the clip 1.
• the carriage 19 is movable in longitudinal horizon ⁇ tal translation in the slide 15, urged by a cylinder 20 of the carriage.
• the thrust compar ⁇ further comprises retractable internal guide members of the branches of the clip.
• These organs must hold each of the branches pressed against the corresponding side wall, and retract on the way of the staple crosspiece.
• Driving rollers 31 come in affleure ⁇ ment from the underside of the slide 15 to drive the clip 1 in the direction of the shoes.
• the front part of the pusher carriage 19 comprises two lateral forks 32 and .33 each comprising an upper branch 34 and a lower branch 35.
• the forks 32 and 33 are separated by a recess 36 allowing the passage of the first shoe 5 to be tied.
• the transverse grooves 26 and 27 of the shoes have annular grooves 38 and 39 respectively arranged in the extension of the side walls 17 and 18 of the slide 15.
• the groove 39 has a width substantially equal to twice the diameter of a clip 1, and is arranged in " a slightly oblique plane with respect to the direction of the transverse grooves 26 and 27.
• the annular groove 38 has a width which is substantially equal to the diameter of the wire forming the clip 1, and is arranged in a plane substantially perpendicular . the direction of the transverse grooves.
• the four ⁇ che 33 corresponding to the shoe 25 has an annular groove 40 of width slightly greater than the diameter of the wire forming the clip 1, and formed on-the f anterior of the fork 33 between the upper 34 and lower 35 branches.
• the device further comprises means for straightening the arms of the staple: these means comprise a removable straightening gui ⁇ 41, urged by a jack 42.
• the guide 41 comprises a body 43 extended forwards by two lateral push rods 44 and 45 substantially of the same spacing as the shoes 24 * and 25.
• FIG. 10 shows the rod 44 extending the body 43.
• the jack 42 drives the guide 41 between a first position in which the rods 44 and 45 are retracted to release the passa ⁇ ge and access to the grooves 26 and 27, and a second position in which the rods 44 and 45 are pushed forward for straighten the staple arms.
• the lower plane of the rods 44 and 45 is flush with the upper part of the trajectory described by the arms of the clip during the winding movement around the second iron 8 in the annular grooves of the shoes.
• a rotary turret 47 is mounted on a mobile support 48 urged by a first jack 49 in a horizontal translational movement from front to back and by a second jack 50 in a vertical movement around an axis of rotation 51.
• the first jack 49 actuates the support 48 between a first position, shown in FIG. 1, in which the rotary turret 47 is retracted to free access to the transverse grooves 26 and 27, and a second position, shown in the Figure 11, in which the rotary turret is facing the grooves of the hooves.
• the rotary turret 47 is rotated about a substantially vertical axis of rotation by a motor not shown in the figures, and comprises an internal housing 52 shown in Figure 10, and two eccentric jaws 53 and 54 defining a clamp self-locking.
• the internal housing 52 has a lower opening 55 for the introduction of the wire, and a conical bottom 56 opening outwardly through an evacuation tunnel 57.
• the tunnel 57 is off-center with respect to the vertical axis of rotation of the turret 47, and slightly oblique with respect to this axis.
• the operation of the device is as follows: in the rest position, shown in FIG. 1, the support 48 of the turret 47 is in the back position, as well as the pusher carriage 19 and the guide 41.
• the support 48 is in po ⁇ low sition.
• a clip 1 is pushed into the vertical slide 14 and engaged against the retaining spout 21 under the pusher cha ⁇ 19.
• the device is engaged on the irons to li ⁇ gature as shown in Figure 10, the first iron 5 passing between the shoes 24 and 25, and the second shoe 8 being engaged in the transverse grooves 26 and 27 of the shoes.
• the carriage cylinder 20 causes the cha ⁇ riot pusher 19 to advance, driving the clip 1 as shown in FIG. 10 in the direction of the sabots 24.
• the forks 32 and 33 come to rest against the second iron 8 to hold it in the transverse grooves of the hooves.
• the arms of the clip 1 are aged in contact with enga ⁇ 'coaches rollers 31 driven in rotation by means of a motor 58 shown schematically.
• the rollers 31 push the clip 1 and cause the engagement of the arms in the annular grooves 38 and 39 of the shoes.
• the arms then take a curved shape around the second iron 8.
• the free end of the longest arm 4 enters the first in the groove 39, follows this groove 39 for a quarter turn, and under the action of the folding effected by the curved shape of the groove, follows a circular trajectory around the second iron 8, guided by the groove 40 of the pusher carriage 19, again enters the groove 39 while the free end of the second arm 3 enters the annular groove 38.
• the guide 41 advances under the action of the jack 42 so that the ends of the push rods 44 and 45 come at the level of the central part of the transverse grooves 26 and 27 to form stop preventing the arms from continuing their rotation around the iron 8.
• the guide 41 then pushes the arms against the front flat wall 29 of the grooves 26 and 27, as shown in FIG. 11 so that, under the action of the thrust of the rollers 31, the arms of the clip 1 come out linearly from the transverse grooves 26 and 27.
• the jack 49 has pushed the support 48 forward to bring the rotary turret 47 opposite the shoes.
• the arms of the clip 1 penetrate through the lower opening 55 and are inserted between the jaws 53 and 54. as shown in FIG. 12, when the crosspiece 2 of the clip 1 has passed the rollers 31 , the actuator - 50 causes the body 48 and the turret 47 to be raised, causing the arms of the staple 1 to be pulled.
• the positive device comprises a first knife 60 secured to the straightening guide 41, and a second knife 61 secured to the support 48.
• the knives 60 and 61 are arranged between the support 48 and the shoes 24 and 25, the cutting part of
• ⁇ knife 61 being slightly in front of the lower opening 55, and the knife 60 being arranged so that, in the position of extreme advance of the guide 41, the cutting part of this knife 60 is slightly set back from the front flat face 29 of the transverse grooves 26 and 27.
• the backward movement of the support 48, under the action of the jack 49, as shown in FIG. 13, causes the clip 1 to be pinched between the knives 60 and 61, and his cut.
• the turret 47 is then caused to rotate to allow the ejection of the drop of wire 62 by the evacuation tunnel 57.
• the elements are then brought back into the retracted position to release the transverse grooves 26 and 27 of the shoes and allow the removal of the clamp.
• the present invention is not limited to the embodiments that have 'been explicitly described, but includes variants and facultyisa ⁇ tions contained within the scope of the claims below.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Mechanical Engineering (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Portable Nailing Machines And Staplers (AREA)
• Reinforcement Elements For Buildings (AREA)
• Wire Processing (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9264320

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Citations (3)

• 1981
  • 1981-11-18 FR FR8122006A patent/FR2516411B1/fr not_active Expired
• 1982
  • 1982-11-17 DE DE8282903324T patent/DE3271898D1/de not_active Expired
  • 1982-11-17 EP EP82903324A patent/EP0093747B1/fr not_active Expired
  • 1982-11-17 WO PCT/FR1982/000191 patent/WO1983001805A1/fr active IP Right Grant
  • 1982-11-18 IT IT24323/82A patent/IT1153076B/it active

Patent Citations (3)

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