Automatic wire bundling twister and wire end engaging member (twisting head) therefor

Abstract

To reduce the physical load of a worker and to improve the working speed by using an automatic tool in binding and fastening work using an annealing wire.SOLUTION: The automatic cable bundling twister JBT includes a twist head TH for twisting a cable BS and an automatic rotating tool DD for rotating the twist head TH. The twist head TH includes a disk part 11 in which a large number of track insertion holes 15 through which one end BE and the other end BE' of the track BS pass are formed, and a shank part 13 for twisting the disk part 11. Since it is only necessary to insert the end portion of the annealing wire into any of the large number of annealing wire insertion holes 15, it is overwhelmingly easy to align the annealing wire end portion with the twist head TH SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an automatic wire binding twister that uses an automatic rotating tool to twist and secure wire (annealed mild steel wire) when binding multiple forms (such as lath forms) for concrete pouring. In particular, it relates to an automatic wire binding twister that has been improved to make it easier to pass the wire ends through the wire end engaging member (twist head) that rotates when twisting the wire. It also relates to a twist head for such a wire binding twister. [Background technology]

[0002] At concrete pouring sites, the assembly and on-site construction of unit lath forms involves lining up the forms and then bundling and connecting these multiple forms together using wire. Furthermore, to support the bundling and connecting lath formwork RK (see Figure 6), temporary single-tube pipes TP and crosspieces SG are similarly bundled and fastened to the formwork around the reinforcing bars TK using wire. Traditionally, these tasks have been performed by manually twisting and turning the wire using pliers such as wire cutters.

[0003] Patent Document 1 proposes "a wire fastener that can easily and quickly fasten reinforcing bars together with wire, and a method for fastening reinforcing bars using the same." The method described in Patent Document 1 states, "A hook portion 2 having hooks 21 and 22 at both ends of an orthogonal axis that is substantially perpendicular to the axial direction of the shaft 12 is provided at the other end of a shaft 12, one end of which is attached to an electric impact driver. A wire 3 bent into a hairpin shape is hung across two reinforcing bars A and B at their intersection K. One hook 21 of the hook portion 2 is inserted into the bent portion 31 of the hairpin-shaped wire 3, and the other hook 22 is engaged near both ends 32 of the hairpin-shaped wire 3. With the electric impact driver rotating, the bent portion 31 of the wire 3 and the areas near both ends 32 are twisted together to fasten the reinforcing bars A and B." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-94404 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] The problem that this invention aims to solve is to use an automatic (electric, etc.) tool in the work of fastening wire ties to reduce the physical burden on workers and improve the work speed. Another object of this invention is to provide an improved twist head that is easier to engage the end of the wire with the wire end engaging member (twist head) that rotates when twisting the wire, compared to the one proposed in Patent Document 1. [Means for solving the problem]

[0006] In this "Means for Solving the Problem" and "Claims," ​​reference symbols for various parts in the attached drawings are shown in parentheses, but this is for reference only and is not intended to limit the scope of the rights to those in the attached drawings.

[0007] The automatic wire binding twister (JBT) of the present invention is characterized by comprising: a wire end engaging member (twist head, TH) having a disk portion (11) formed with a number of wire insertion holes (15) through which one end (BE) and the other end (BE') of a wire (BS) pass, and a shank portion (13) that twists the disk portion (11); and an automatic rotary tool (DD) having a chuck connected to the shank portion (13). The wire end engaging member (twist head, TH) of the present invention is characterized by having a disk portion (11) formed with a number of wire insertion holes (15) through which one end (BE) and the other end (BE') of a wire (BS) pass, and a shank portion (13) that twists the disk portion (11).

[0008] That is, the inventors of the present invention developed a specially shaped wire end engaging member (wire tightening jig, twist head) for use in bundling and fastening materials using wire, and invented an attachment that can be connected to a power tool. This invention reduces the physical strain associated with conventional manual wire twisting and bundling work and also improves work speed. Furthermore, since the wire end engaging member (twist head, TH) has many wire insertion holes (15) formed therein (for example, 4 to 12 holes), the wire end can be inserted into any one of these holes, greatly simplifying the effort of aligning the wire end with the wire end engaging member.

[0009] "Nominal wire" refers to annealed steel wire used for scaffolding and binding rebar. Nominal diameters include No. 8 (4 mm diameter), No. 12 (2.6 mm diameter), and No. 14 (2 mm diameter). There is also "Noritz Nominal Wire (Hakobansen)," which is "annealed Nominal Wire cut to the appropriate size and folded in half" (example dimensions: diameter 2.8 mm x folded length 700 mm). In the present invention, the size of the nominal wire is not limited. In the lath formwork connection work in the embodiment described below, a U-shaped "Hakobansen" with a diameter of 2.8 mm x folded length of 90 mm x width of 24 mm is usually used.

[0010] The diameter of the wire insertion holes (15, 55, 65, 75) is larger than the wire diameter so that the wire can be easily passed through, but small enough to prevent the wire from falling out during twisting. The diameter is also large enough to allow multiple insertion holes (15, 55, 65, 75) to be drilled in the disk portions (11, 51, 61, 71) that are large enough to be easily held with fingers. The diameter is also large enough to allow the twist head TH to be easily removed from the wire after twisting. In the embodiment described below, the wire diameter is 2.8 mm, the insertion hole diameter is 4 mm, and the disk portions (11, 51, 61, 71) have a diameter of 39 mm, resulting in 12 holes. The disk portions (11, 51, 61, 71) are primarily designed to have a disk-like shape for ease of processing, but are not limited to this (polygonal shapes are also acceptable). The positions on the disk portion (11, 51, 61, 71) where the through holes (15) are drilled are usually drilled at uniform intervals on a certain circumference, but this is not limited to this. It is preferable to provide a large chamfer or inclined surface (tapered surfaces (51g, 51f, 61g, 61f, 76), tapered groove (11d), tapered surfaces (11f, 11g)) on the wire entry side (opposite the shank side) of the through holes (15, 55, 65, 75).

[0011] In the first embodiment of the present invention, tapered surfaces (11f-11g, 51g, 51f, 61g, 61f, 76) are formed on the wire entry side (opposite the shank side) of the multiple insertion holes (15, 55, 65, 75) of the disk portion (11, 51, 61, 71). When passing the tip of the wire end (BE) through the insertion hole (11, 55, 61, 75), if the tip of the wire is advanced along the tapered surface (11f-11g, 51g, 51f, 61g, 61f, 76), the wire end (BE) can be easily introduced into the insertion hole (15, 55, 65, 75). In the second embodiment of the present invention, a tapered groove (11d, with tapered surfaces 11f and 11g on the inside and outside) is formed on the wire entry side (opposite the shank side) of the disk portion (11) along the row of the numerous insertion holes (15), and the insertion holes (15) are opened at the bottom of the groove. When passing the tip of the end (BE) of the wire through the insertion hole (15), if the tip of the wire is advanced along the tapered groove (11d, with tapered surfaces 11f and 11g on the inside and outside), the end (BE) of the wire can be easily guided into the insertion hole (15).

[0012] In the second embodiment of the present invention, it is preferable that the tapered surfaces (11f-11g) of the tapered groove (11d) are formed with recesses (11j-11k) that become deeper toward the depth of the groove or toward the insertion hole (15). When passing the tip of the end (BE) of the wire through the insertion hole (15), the tip of the wire is advanced along the tapered groove (11d) toward the tool side and guided to the bottom of the recesses (11j·11k) in the circumferential direction (this can be felt by hand), which makes it easier to guide the end (BE) of the wire through the insertion hole (15).

[0013] The automatic rotary tool for the automatic wire binding twister (JBT) of the present invention can be a torque wrench or drill driver. It can be a battery-powered tool, one that is powered by a power cord, or one that is powered by compressed air via a hose. The required torque for a 2.8 mm diameter wire is approximately 4 to 4.5 N·m (as an example). The shank is fixed in the tool's chuck. [Effects of the Invention]

[0014] According to the present invention, when using a wire to bind formwork to formwork, temporary construction material to formwork, or materials to each other, the conventional series of operations of manually twisting and tightening the wire with a wire cutter or other pliers-like tool can be performed using an automatic tool. Furthermore, the wire can be easily inserted into an attachment jig (twist head TH) and rotated to perform the fastening work, reducing the physical burden associated with conventional work and improving work speed. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view schematically showing the state of use of an electric wire binding twister according to an embodiment of the present invention (two lath forms being bound and connected with wires). [Figure 2] 2A and 2B are diagrams of the twist head TH of the wire twister of FIG. 1, in which (A) is a front view seen from the side of the object to be bound, (B) is a side cross-sectional view, and (C) is a rear view seen from the tool side. [Figure 3] Fig. 3(A) is a perspective view of the disk portion 11 of the twist head TH in Fig. 2, seen from the oblique object side. Fig. 3(B) is an enlarged cross-sectional view of the vicinity of the wire insertion hole 15 and the tapered groove 11d on the object side. [Figure 4] 1A and 1B are diagrams showing a modified example of the twist head TH, in which (A) is a front view seen from the side of the object to be bound, and (B) is a perspective view seen from the side of the oblique object to be bound. [Figure 5] FIG. 10 is a side cross-sectional view of a disk portion 61 of a twist head TH″ according to another modified example. [Figure 6] This is a photograph of an example of an assembled state in which lath formwork has been tied and connected, and temporary supporting pipes and battens have also been tied and fastened to the formwork using wire. [Figure 7] 10A and 10B are diagrams of a disk portion 71 of a twist head th according to another modified example, in which (A) is a front view seen from the side of the object to be bound, and (B) is a side cross-sectional view. [Explanation of symbols]

[0016] JBT; Automatic wire binding twister, BS; wire, BSE; wire end TH: Twist head (wire end engaging member), DD: Automatic (electric) rotating tool, R1·R2: Lath formwork 11; disk portion, 11b; surface on the side of the object to be bound (wire entry side), 11d; tapered groove, 11f; outer tapered surface, 11g; inner tapered surface, 11j·11k; recess, 11x; central convex part, 13; shank part, 15; wire insertion hole 51; disk portion, 51g; inner tapered surface, 51f; outer tapered surface, 51x; central convex portion, 53; shank portion, 55; through hole 61; disk portion, 61d; tapered groove, 61f; outer tapered surface, 61g; inner tapered surface, 63; shank portion, 65; through hole 71; disk portion, 75; through hole, 76; tapered surface, 76x; overlapping portion, 91·92;External longitudinal muscles DETAILED DESCRIPTION OF THE INVENTION

[0017] Below, an embodiment of the present invention will be described with reference to the attached drawings. In each drawing, the directions "up" and "down" indicated by the arrows are directions along the Earth's gravity. The "object side" is the side on which the object to be bound with the wire is located. The "object side" is also the side on which the end of the wire to be twisted enters, and is sometimes called the "wire entry side." The "tool side" is the side opposite the "object side." The "tool side" is sometimes called the "wire exit side." "Left" and "right" refer to the left and right directions when looking at the front of the wire twister from the object side. Naturally, the numerical values, specific shapes, etc. in the description of the embodiments are merely examples, and the present invention is not limited to those numerical values, specific shapes, etc.

[0018] FIG. 1 is a perspective view schematically showing the state of use of an electric wire binding twister according to an embodiment of the present invention (two lath forms being bound and connected with wires). In Figure 1, two lath formwork pieces R1 and R2 are shown in imaginary lines, lined up side by side. Both lath formwork pieces R1 and R2 are erected, with their external vertical reinforcement bars 91 and 92 (steel round bars φ10 mm) lined up vertically, close together. The two external vertical reinforcement bars 91 and 92 will be tied together with BS wire to connect the two lath formwork pieces R1 and R2. The wire BS is a box wire (folded wire) with a diameter of 2.8 mm, a length of 90 mm, and a width of 25 mm. This folded wire BS is wrapped around the outside of the two outer vertical bars 91 and 92 (one end of the wire BE is inserted between the outside of the outer vertical bars 91 and 92 and the lath mesh and rotated 180 degrees), and the rotated end of the wire BE is pulled out toward the tool.

[0019] The electric wire binding twister JBT is shown at the back of the figure. The twister JBT consists of a twist head TH at the front and a drill driver DD at the back. Both ends BE and BE' of the wire are passed through separate wire insertion holes 15 in the twist head TH. Details of the twist head TH will be described later with reference to Figures 2 and 3. In this example, the drill driver DD is a Panasonic EZ74A1 (although, of course, this is not limited to this). The driver DD and twist head TH (attachment) are connected by inserting the shank portion 13 (described below) of the head TH into the chuck of the driver DD.

[0020] Next, the twist head TH will be described with reference to FIGS. Figure 2 is a diagram of the twist head TH of the electric wire twister JBT in Figure 1, where (A) is a front view seen from the side of the object to be twisted, (B) is a side cross-sectional view, and (C) is a rear view seen from the tool side. Figure 3(A) is a perspective view of the disk part 11 of the twist head TH in Figure 2 seen from the oblique side of the object to be twisted. Figure 3(B) is an enlarged cross-sectional view of the wire insertion hole 15 and its tapered groove 11d on the side of the object to be twisted.

[0021] As shown in Figures 2(B) and 3(A), the electric wire binding twister JBT consists of a disk portion 11, a rod portion 12, and a shank portion 13, which are connected in the axial direction (from the object to be bound to the tool side). The disk portion 11 is a disk-shaped portion with a number of wire insertion holes 15 formed therein, through which one end BE and the other end BE' (see Figure 1) of the wire BS pass. The rod portion 12 is a thick round bar-shaped portion that is connected to the tool side of the central axial portion of the disk portion 11. As can be clearly seen in Figure 2(C), the shank portion 13 is a portion with a roughly triangular rod-like outer shape, and is connected to the tool side of the central axial portion of the rod portion 12. The shank portion 13 is connected to a drill driver DD (see Figure 1), and transmits torque that twists the disk portion 1 via the rod portion 12.

[0022] As can be clearly seen in Figure 3, a tapered groove 11d with a generally triangular cross section is carved into the surface 11b of the disk portion 11 on the side of the object to be bound (the wire insertion side). The tapered groove 11d is made up of an outer tapered surface 11f and an inner tapered surface 11g. In this example, the angle θ2 between the two tapered surfaces and the center line of the insertion hole 15 is 35° (the opening angle of the tapered groove 11d is 70°). The inside of the inner tapered surface 11g forms a central convex portion 11x in the shape of a truncated cone. Twelve insertion holes 15 are bored at equal intervals around the circumference of the bottom of the tapered groove 11d. The insertion holes 15 extend in the same direction as the central axis of the twist head TH and have a diameter of 4 mm in this example. Since the diameter of the nominal wire BS is 2.8 mm, the gap between the nominal wire and the insertion holes 15 is 1.2 mm. The diameter of the circle on which the centers of the insertion holes 15 are aligned is 25 mm. The width of the wall 11r (FIG. 2(A)) between adjacent insertion holes 15 is approximately 2 mm. Therefore, the ratio of the area of ​​the circumference of the bottom of the tapered groove 11d where the insertion holes 15 exist is approximately 60% (this ratio is preferably 40% or more, more preferably 50% or more, and even more preferably 60% or more). This is because the nominal wire end BE guided to the bottom of the tapered groove 11d can easily enter the insertion holes 15.

[0023] As can be clearly seen in Figure 3(B), the tapered surfaces 11f and 11g of the tapered groove 11d of the twist head TH described above are formed with recesses 11j and 11k that deepen toward the groove depth and toward the insertion hole 15. As shown in Figure 2(A), the outer recess 11j is formed on the outer periphery of the insertion hole 15, and the inner recess 11k is formed on the inner periphery of the insertion hole 15, with the center lines of the three extending radially. In this example, the angle θ1 formed between the bottoms of the recesses 11j and 11k and the center line of the insertion hole 15 is 30°. When passing the tip of the end BE of the wire through the insertion hole 15, the tip of the wire can be easily guided into the insertion hole 15 by advancing it along the tapered groove 11d toward the tool side and guiding it to the bottom of the recesses 11j and 11k in the circumferential direction (this can be felt by hand).

[0024] As shown in Figure 2(B), the rod portion 12 is a straight cylinder 1 to 2 cm long and has a diameter slightly smaller than the inner edges of the numerous insertion holes 15. The role of this rod portion 12 is to provide a space between the disk portion 11 and the chuck of the drill driver DD. As shown in Figure 1, this space is where the tip BE of the wire BS passes through to the power tool side of the twist head TH. In reality, if the twist head TH and drill driver DD are moved further toward the lath formwork R1 / R2 from the state shown in Figure 1 and the twist head TH is turned, the wire BS on the lath formwork side of the head TH will be twisted, binding the two outer vertical reinforcements 91 and 92.

[0025] The twist head TH can be made of quenched and tempered structural steel or the like. The tapered groove 11d and the insertion hole 15 can be surface-hardened by chrome plating or other methods to prevent wear. The twist head TH is preferably manufactured by forging, which reduces the number of cutting steps.

[0026] The following is a summary of how to use the electric wire binding twister of this embodiment. Wrap the wire around the object to be bound, and insert both ends of the wire into one of the insertion holes 15 of the twist head TH (attachment). The tip of the wire is advanced toward the tool along the tapered groove 11d, and guided circumferentially to the bottom of the recesses 11j and 11k. The wire is pulled moderately or sufficiently into the insertion hole 15 of the twist head TH, leaving the portion to be twisted. Set the torque of the power tool to 4 to 4.5 N·m, and operate (turn) the power tool. Once the wire has been twisted and the object to be bound has been fastened, the twist head TH is removed from the wire. Repeat this process to bind multiple binding points. In this way, when binding formwork to formwork, temporary materials to formwork, or materials together using wire, instead of the series of steps that were previously performed by manually twisting and tightening the wire using pliers such as wire cutters, it is now possible to use power tools, and the wire can be easily inserted into a twist head (attachment jig), rotated, and the binding work can be performed, reducing the physical strain associated with conventional work and improving work speed.

[0027] 4A and 4B are diagrams of the disk portion 51 of a modified twist head TH', where (A) is a front view of the object to be bound and (B) is a perspective view. In this example, the central convex portion 51x is truncated pyramid-shaped, and four insertion holes 55 are drilled around its four sides. From the central convex portion 51x toward the insertion holes 55, there is an inner tapered surface 51g that is inclined (recessed) toward the tool. From the insertion holes 55 toward the outer periphery, there is an outer tapered surface 51f that protrudes. The twist head TH' of this modified example has the feature that it pulls in and twists up the wire while more restricting it when the twister rotates.

[0028] FIG. 5 is a side cross-sectional view of the disk portion 61 of a twist head TH" according to another modified example. The twist head TH" of this example is characterized in that the insertion hole 65 faces the outer periphery of the disk portion 61 (inclined outward) on the wire outlet side (right side of the figure). The entrance side of the insertion hole 65 opens to the bottom of the tapered groove 61d (outer tapered surface 61f, inner tapered surface 61g). This configuration allows the twist circle of the wire to be larger, resulting in a more secure binding.

[0029] FIG. 7 shows a disk portion 71 of another modified twist head th, where (A) is a front view of the object to be bound and (B) is a side cross-sectional view (the cross section shows only the disk portion 71). In this example, a tapered surface 76 is formed on the wire-entry side (opposite the shank side) of a large number (12) of insertion holes 75 in the disk portion 71. In this example, the tapered surface 76 is a conical surface (the diameter increases toward the wire-entry side) coaxial with the insertion holes 75. In this example, the angle it forms with the tapered axis is 30°. This angle may be approximately 30° to 45°. In this example, the dimension of the tapered entrance (maximum diameter portion) is approximately twice the diameter of the insertion holes 75 (it may be two to three times or more). The tapered entrance may be large enough to overlap (extend beyond) the outer periphery of the disk portion 71. The tapered surfaces 76 that are adjacent on the circumference overlap each other, and the overlapping portion 76x is linear in front view and is slightly recessed in the axial direction. Such overlapping of the adjacent tapered surfaces 76 does not matter.

[0030] When passing the tip of the end (BE) of the wire through the insertion hole 75, by advancing the tip of the wire along this tapered surface 76, the end (BE) of the wire can be easily guided into the insertion hole 75. Compared with the embodiment of FIGS. 2 and 3, the embodiment of FIG. 7 can be manufactured at a lower cost.

Claims

1. a wire end engaging member (twist head, TH) having a disk portion (11, 51, 61, 71) formed with a large number of wire insertion holes (15, 55, 65, 75) through which one end (BE) and the other end (BE') of a wire (BS) pass, and a shank portion (13, 53, 63, 73) for twisting the disk portion (11, 51, 61, 71); an automatic rotary tool having a chuck connected to the shank portion (13, 53, 63, 73); An automatic wire binding twister (JBT) characterized by comprising:

2. A wire end engaging member (twist head, TH) characterized by having a disk portion (11, 51, 61, 71) formed with a number of wire insertion holes (15, 55, 65, 75) through which one end (BE) and the other end (BE') of a wire (BS) pass, and a shank portion (13, 53, 63, 73) that twists the disk portion (11, 51, 61, 71).

3. The automatic wire binding twister (DBT) according to claim 1, characterized in that tapered surfaces (11f, 11g, 51g, 51f, 61f, 61d, 76) are formed on the wire entry side (opposite the shank side) of the multiple insertion holes (15, 55, 56, 75) in the disk portion (11, 51, 61, 71).

3. The wire end engaging member (twist head) according to claim 2.

4. The automatic wire binding twister (DBT) according to claim 1, characterized in that a tapered groove (11d) is formed along the row of the numerous insertion holes (15) on the wire insertion side (opposite the shank side) of the disk part (11), and the insertion holes (15) are opened at the bottom of the groove. A wire end engaging member (twist head, TH) according to claim 2.

5. The automatic wire binding twister (DBT) or wire end engaging member (twist head, TH) according to claim 4, characterized in that the tapered surfaces (11f, 11g) of the tapered groove (11d) are formed with recesses (11j, 11k) that become deeper toward the depth of the groove or toward the insertion hole (15).

6. An automatic wire binding twister (DBT) or wire end engaging member (twist head, TH) according to claim 4, characterized in that the area in which the insertion hole (15) exists is 40% or more of the entire circumference of the bottom of the tapered groove (11d).

7. 2. The automatic wire binding twister (DBT) according to claim 1, wherein the wire insertion hole (65) is inclined toward the outer periphery of the disk portion (61) on the wire outlet side. A wire end engaging member (twist head, TH) according to claim 2.

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