WO2019054627A1 - Method for manufacturing coupler for joining reinforcing bars - Google Patents

Abstract

The present invention relates to a method for manufacturing a coupler for joining reinforcing bars, the coupler comprising: a body having a hollow body shape, and having threads formed on the inner sides of both ends thereof; a cap, which has a hollow body shape and is screw-coupled to the body, and is formed such that the inner periphery thereof has an inner diameter gradually becoming smaller toward the end portion thereof; and a fastening piece, which is positioned inside the cap, and has an outer periphery formed obliquely so as to correspond to the inner periphery of the cap, wherein, when the reinforcing bars are inserted into a hollow hole of the fastening piece through a hollow hole of the cap, the cap, which is screw-coupled to the body, is fastened such that the fastening piece presses the reinforcing bars.

Description

How to make coupler for reinforcing joint

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupler for reinforcing bars used for connecting members formed in a round bar shape such as a reinforcing bar or pipe in a construction site in a longitudinal direction, And a cap which is threadedly coupled to the body as a hollow body and whose inner diameter gradually decreases toward an end of the body, and an inner circumference of the cap is located inside the cap, When the reinforcing bar is inserted into the hollow hole of the fastening hole through the hollow hole of the cap, the fastening screw presses the reinforcing bar by tightening the cap screwed to the body.

Couplers are tools that are used to connect rod-shaped members such as steel bars or pipes to civil engineering or construction sites.

According to the prior art related to this coupler, in Japanese Patent Registration No. 0973437, a reinforcing coupler capable of accommodating a deformed reinforcing bar in a lateral direction so as to linearly connect the connecting ends of two deformed reinforcing bars, A coupler body inserted to connect the two reinforcing bars to each other; A plurality of coupler locks slidably coupled to the coupler body to hold the deformed reinforcing bars to prevent the deformed reinforcing bars from being pulled out; A spring having the same number as the coupler lock, one side of which is inserted into the coupler body and the other side of which is inserted into the coupler lock, so that the coupler lock resiliently slides on the coupler body; A coupler housing which completely encloses the coupler body so that the coupler body and the coupler lock are inserted into the coupler body; And a retainer installed inside the coupler housing to prevent the deformed reinforcing bars from being swayed from side to side when the deformed reinforcing bar is inserted into the coupler body and is not caught by the coupler lock, Wherein the coupler body has a reinforcing bar insertion cavity into which the deformed reinforcing bar is inserted at the center and a locking insert opening in which the coupler lock is inserted in the longitudinal direction in the circumferential direction and in the same quantity as the quantity of the coupler lock, Wherein the lock insertion opening is formed with a lock mounting step for sliding and sliding the coupler lock in a longitudinal direction thereof, and the coupler lock is formed by cutting a rectangular parallelepiped in a diagonal shape, Is equal to the inclination angle of the cone column of the coupler body, The coupler lock is provided with teeth, which are inclined in one direction so as to be easily inserted when the node of the deformed reinforcing bar is inserted in the longitudinal direction and can be engaged when the deformed reinforcing bar is pulled out, a spring second insertion hole into which the spring is inserted, Wherein the coupler body and the coupler lock are separated into a mail housing and a mail housing into which the coupler body and the coupler lock are inserted, wherein the mail housing and the mail housing are inserted and coupled in a socket type, A hollow portion having the same outer shape as the outer shape of the coupler body and having the deformed reinforcing bars inserted therein so that the coupler body can be inserted into the mail housing; A mail insertion unit into which a mail housing is inserted; And a detachment preventing jaw for preventing the detachment of the coupler body to the outside is formed on the outer circumferential surface of the coupler body so that the coupler body can be inserted into the inside of the female housing, A socket portion into which the mail housing is inserted, and a detachment preventing jaw for preventing the coupler body and the retainer from falling out to the outside are formed and registered.

Another prior art is a reinforcing coupler comprising a left and right body in which both ends of a reinforcing bar are inserted and fixed, a right and left gripping portions provided inside the right and left bodies to grip both ends of a reinforcing bar, , The left and right bodies each comprise a front reinforcing steel insert hole, a side wall and a rear hole, the rear portions of the right and left bodies are mutually engaged, the inside diameter of the side wall is a tapered shape, Wherein the tapered portion of the right and left gripper portions works in cooperation with the inclined portion of the sidewall inner diameter so as to act as a wedge so as not to detach the reinforcing bar, and the inner diameter portions of the right and left gripper portions are chamfered in the longitudinal direction A groove is formed at the lower side of the sawtooth to accommodate the projecting portion of the reinforcing bar, Each of the gripping portions is divided into a plurality of slices, and the plurality of slices are arranged radially with respect to the reinforcing rod insertion hole. Between the slits of the right and left grip portions divided into a plurality of slits, a grip portion guide is inserted between the slices And the inside diameter portion of the left and right grip portions is rounded concavely so as to be able to grip the reinforcing bar, both sides are rounded convexly in the outward direction, and the outside diameter portion is formed so as to be in contact with the right and left bodies Type quick coupler for reinforcing bars is disclosed.

However, the conventional reinforcing coupler has a disadvantage in that it is not easy to manufacture due to its complicated structure, its manufacturing time and manufacturing cost are high, and the fastening operation time is long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a coupler for a reinforcing bar joint which is simple in construction and easy to manufacture and can shorten a fastening operation time for connecting reinforcing bars.

A cap having a hollow body and having threads formed inside thereof at both ends in a hollow body shape and having a hollow body shape and being screwed to the body so that the inner periphery gradually becomes smaller in diameter toward the end, The outer periphery of which is inclined to correspond to the inner periphery of the cap. When the reinforcing bar is inserted into the hollow hole of the tightening hole through the hollow hole of the cap, the cap screwed to the body is tightened, A method of manufacturing a reinforcing coupler for reinforcing a reinforcing bar,

The body having a diaphragm formed at a central portion of the inner space so that the reinforcing bars inserted at both ends do not collide with each other, the diaphragm having a disc shape having a diameter equal to the inner diameter of the body; Molding the disc-shaped metal material into a hemispherical shape; Placing the hemispherically shaped metal material in the inner center of the body; The edge of the metal material is pressed and fastened to the inner circumference of the body by pressing the hemispherical metal material into a disk shape by inserting a pressing member at both ends of the body, .

As described above, the coupling for reinforcing bars according to the present invention has a simple structure, which makes it very easy to manufacture, and thus the manufacturing cost is low. In addition, the fastening operation time is significantly shortened in connecting the reinforcing bars .

1 is an exploded perspective view of a reinforcing coupler of the present invention.

Fig. 2 is a perspective view showing the assembled reinforcing coupler of the present invention. Fig.

3 is a schematic cross-sectional view of a body of a reinforcing coupler according to the present invention.

4 is a schematic sectional view of a cap of a reinforcing coupler according to the present invention.

5 is a schematic view of a guide of a reinforcing coupler of the present invention.

Fig. 6 is a schematic view of a compression piece of a reinforcing coupler of the present invention. Fig.

7 is a view showing the process of forming the body of the reinforcing coupler of the present invention.

Fig. 8 is a process chart of pressing piece forming of the reinforcing coupler of the present invention. Fig.

FIG. 9 is a photograph of a compression piece according to still another embodiment of the reinforcing coupler of the present invention. FIG.

10 is a perspective view of a fastener incorporating a compression piece and a guide according to still another embodiment of the reinforcing coupler of the present invention.

* Explanation of symbols *

100. Coupler

110. Body 111. Diaphragm

120. Cap

130. Fasteners 131. Guide 131-1. Seat groove

131-2. Stall hole 131-3. Projection 132. Pressing piece

132-1. Jaw

140. Spring

200. Rebar

310. Upper mold 320. Lower mold

400. The pressing member

A body 110 having a hollow body shape with threads formed on the inner side of both ends thereof and a cap 120 which is threadedly coupled to the body 110 as a hollow body and whose inner diameter gradually becomes smaller toward the end, And a tightening member 130 which is located inside the cap 120 and whose outer circumference is inclined to correspond to the inner circumference of the cap 120. The tightening member 130 is fastened through the hollow hole of the cap 120, When the reinforcing bar 200 is inserted into the hollow hole of the reinforcing bar coupling 130, the tightening hole 130 presses the reinforcing bar 200 by tightening the cap 120 screwed to the body 110. [ In the production method of the present invention,

A diaphragm 111 is formed at a central portion of the inner space of the body 100 so as to prevent the reinforcing bars 200 inserted at both ends from bumping into each other. Making a disc shape having a diameter equal to the inner diameter; Molding the disc-shaped metal material into a hemispherical shape; Placing the hemispherically shaped metal material in the inner center of the body 110; The edge of the metal material is pressed and connected to the inner peripheral edge of the body 110 through the step of inserting the pressing member into both ends of the body 110 to press the semispherical metal material into a disc shape from both sides, (111).

The tightening hole 130 is formed in the guide 131 having a hollow shape with a smaller inner diameter as the outer diameter of the tightening hole 130 is gradually increased along the longitudinal direction of the guide 131, And a wedge-shaped pressing piece 132 is inserted into the elongated hole 131-2. The pressing piece 132 is formed by forming a metal-made hollow body into a conical shape; And forming the wedge-shaped pressing piece 132 by dividing the hollow body formed into the conical shape into a plurality of hollow bodies.

The guide 131 is manufactured by injection molding a synthetic resin material.

After forming the wedge-shaped pressing piece 132 by dividing the hollow body formed into a cone shape into a plurality of hollows, the step of forming the concave and convex is formed inside the pressing piece 132 formed in a wedge shape; And a heat treatment step is added.

Hereinafter, a method of manufacturing a reinforcing coupler will be described in detail with reference to the accompanying drawings.

1 is a exploded perspective view of a reinforcing coupler according to the present invention, FIG. 2 is a perspective view of the reinforcing coupler of the present invention, FIG. 3 is a schematic cross- Fig. 5 is a schematic view of a guide of a reinforcing coupler of the present invention, and Fig. 6 is a schematic view of a compression fitting of a reinforcing coupler of the present invention.

As shown in FIGS. 1 to 6, the reinforcing coupler 100 includes a body 110 having a hollow body and threads formed on the inner side of both ends thereof, and a body 110 having a hollow body shape, A cap 120 having an inner circumferential edge which gradually decreases in diameter toward an end portion thereof and an outer circumferential surface which is inclined to correspond to an inner circumferential edge of the cap 120, And a sphere (130).

When the reinforcing bar 200 is inserted into the hollow hole of the tightening hole 130 through the hollow hole of the cap 120, the cap 120 screwed to the body 110 is rotated to tighten the tightening hole 130 ) Presses the reinforcing bars 200 and finally grasps the reinforcing bars 200. [

A diaphragm 111 is formed at the center of the inner periphery of the body 100 so as to prevent the reinforcing bars 200 inserted at both ends from being inserted.

The tightening hole 130 is formed in the guide 131 having a hollow shape with a smaller inner diameter as the outer diameter of the tightening hole 130 is gradually increased along the longitudinal direction of the guide 131, And a wedge-shaped pressing piece 132 is inserted in the long hole 131-2.

A spring 140 is installed between the diaphragm 111 and the tightening tool 130 to allow the tightening tool 130 to firmly hold the reinforcing bar 200 by the elastic restoring force of the spring 140 .

The spring 140 is mounted between the guide 131 of the fastener 130 and the diaphragm 111. The spring 140 may be one of the same diameter as the guide 131 having a larger diameter, A plurality of springs 140 having a small diameter may be arranged at regular intervals from each other along the circumferential direction of the guide 131. [

At this time, in order to mount the small spring 140, a seating groove 131-1 in which one end of the spring 140 is inserted is formed on one surface of the guide 131 having a larger diameter at both ends of the guide 131 The spring 140 mounted between the guide 131 and the diaphragm 111 is not easily detached from the designated position.

In addition, when the grooves are formed on both sides of the diaphragm 111, the spring 140 can be stably installed.

Meanwhile, the cap 120 used in the coupler 100 for reinforcing bars includes a step of machining the inside and the outside using a hollow metallic material, and a step of heat-treating the processed cap 120.

7 is a view showing the body molding process of the reinforcing coupler of the present invention.

7, the diaphragm 111 formed at the center of the body 110 of the reinforcing coupler 100 is formed into a disc shape having a diameter equal to the inner diameter of the body 110 A step of forming the disc-shaped metal material into a hemispherical shape, a step of placing the hemispherically shaped metal material in an inner center of the body 110, (400) is inserted to press the hemispherical metal material so as to have a disk shape again on both sides.

That is, as the diameter of the metal material is increased by pressing both sides of the hemispherical metal material, the edge of the metal material is pressed and joined to the inner circumference of the body 110 to form the diaphragm 111.

Alternatively, a disc-shaped material having a diameter larger than the inner diameter of the body 110 may be formed in a hemispherical shape through upper and lower dies 310 and 320 to be described later, Thereby forming a circumferential groove (not shown).

When a hemispherical metal material is inserted into the inside of the body 110 and a pressing member 400 is inserted into both ends of the body 110 to press the hemispherical metal material on both sides, And the disk-shaped metal material is inserted into the circumferential groove formed in the inner circumference of the body 110, so that a more rigid fastening relationship can be achieved.

The diameter of the disc-shaped metal material is preferably equal to or larger than the inner diameter of the circumferential groove formed in the inner circumference of the body 110.

Meanwhile, in the step of molding the disk-shaped metal material into the hemispherical shape, the metal material is formed between the upper and lower dies 310 and 320, and the lower dies 320 are formed in an upward convex shape on the upper surface And a concave groove is formed on the lower surface of the upper mold 310 so as to correspond to the upper surface of the lower mold 320.

In addition, the pressing members 400 inserted into both ends of the body 110 in the step of inserting the pressing member into both ends of the body 110 so as to press the hemispherical metal material from the both surfaces into a disk shape, And the surfaces facing each other are preferably planar.

By the above-described method, the disc-shaped metal material is formed as the diaphragm 111.

Fig. 8 is a view showing the pressing piece forming process of the reinforcing coupler of the present invention.

As shown in FIG. 8, the compression piece 132 used in the coupler 100 for reinforcing bars includes a metallic material hollow body formed in a conical shape; And forming the wedge-shaped pressing piece 132 by dividing the hollow body formed into the conical shape into a plurality of hollow bodies.

And forming a wedge-shaped compression piece (132) by dividing a hollow body formed into a conical shape so that a frictional force or an engagement portion with the reinforcing bar (200) is increased when assembled to the coupler (100) Thereafter, a step of forming irregularities in the inside of the pressing piece 132 formed in a wedge shape and a heat treatment step are added.

Further, the pressing piece 132 may be manufactured by press working.

That is, the metal plate may be cut to a predetermined size and then formed by blanking, piercing, cutting, drawing, burring using a progressive metal mold.

FIG. 9 is a photograph of a pressing piece according to another embodiment of the reinforcing coupler of the present invention, and FIG. 10 is a photograph of a fastening piece combined with a pressing piece and a guide according to another embodiment of the reinforcing coupler of the present invention.

As shown in Figs. 9 and 10, a hooking protrusion 132-1 larger than the width of the elongate hole 131-2 is attached to the upper surface edge of the pressing piece 132 inserted into the elongated hole 131-2 of the guide 131 The pressing piece 132 is completely inserted into the guide 131 through the long hole 131-2 by the engaging jaw 132-1 even if the pressing piece 132 is inserted into the long hole 131-2 .

A protrusion 131-3 made of a synthetic resin material is formed on the inner side surface in the longitudinal direction of the elongated hole 131-2 by forming a groove (not shown) in the thickness direction on the side surface in the longitudinal direction of the pressing member 132 The protrusion 131-3 made of a synthetic resin material formed on the inner surface of the elongated hole 131-2 is pressed against the groove of the pressing piece 132 when the pressing piece 132 is inserted into the long hole 131-2. It is possible to prevent the pressing piece 132 inserted into the elongated hole 131-2 from being inserted and to prevent the pressing piece 132 from being pulled out by the reinforcing bar 200 in the state where the pressing piece 132 is inserted into the inside of the body 110 So that it can serve as a guide when it protrudes.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

As described above, the coupling for reinforcing bars according to the present invention has a simple structure, which makes it very easy to manufacture, and thus the manufacturing cost is low. In addition, the fastening operation time is significantly shortened in connecting the reinforcing bars .

Claims (1)

A body 110 having a hollow body shape with threads formed on the inner side of both ends thereof and a cap 120 which is threadedly coupled to the body 110 as a hollow body and whose inner diameter gradually becomes smaller toward the end, And a tightening member 130 which is located inside the cap 120 and whose outer circumference is inclined to correspond to the inner circumference of the cap 120. The tightening member 130 is fastened through the hollow hole of the cap 120, When the reinforcing bar 200 is inserted into the hollow hole of the reinforcing bar coupling 130, the tightening hole 130 presses the reinforcing bar 200 by tightening the cap 120 screwed to the body 110. [ In the production method of the present invention, A diaphragm 111 is formed at a central portion of the inner space of the body 110 so that the reinforcing bars 200 inserted at both ends do not collide with each other. The diaphragm (111) is manufactured by forming a metal material into a disk shape having a diameter equal to the inner diameter of the body (110); Molding the disc-shaped metal material into a hemispherical shape; Placing the hemispherically shaped metal material in the inner center of the body 110; The edge of the metal material is pressed and connected to the inner peripheral edge of the body 100 through the step of inserting a pressing member into both ends of the body 110 so as to press the semispherical metal material into a disc shape from both sides, (111) The metal material is formed between the upper and lower dies 310 and 320. The lower dies 320 are formed in an upward convex shape on the upper surface, The bottom surface of the mold 310 is formed with a concave groove corresponding to the top surface shape of the lower mold 320, The pressing member 400 inserted into both ends of the body 110 may be formed in the same shape as the pressing member inserted into both ends of the body 110 so that the hemispherical metal material is compressed in a disk shape on both sides Wherein the surfaces facing each other are flat surfaces, The tightening hole 130 is formed in the guide 131 having a hollow shape with a smaller inner diameter as the outer diameter of the tightening hole 130 is gradually increased along the longitudinal direction of the guide 131, And a wedge-shaped pressing piece 132 is inserted into the elongated hole 131-2, The pressing piece 132 may be formed by forming a metallic material hollow body into a conical shape; And forming the wedge-shaped pressing piece (132) by dividing the hollow body formed into the conical shape into a plurality of hollow bodies, After forming the wedge-shaped pressing piece 132 by dividing the hollow body formed into a cone shape into a plurality of hollows, the step of forming the concave and convex is formed inside the pressing piece 132 formed in a wedge shape; A heat treatment step is added, A spring 140 is installed between the diaphragm 111 and the tightening tool 130 to allow the tightening tool 130 to firmly hold the reinforcing bar 200 by the elastic restoring force of the spring 140, A seating groove 131-1 into which one end of the spring 140 is inserted is formed on one side of the guide 131 having a larger diameter on both ends of the guide 131 of the tightening tool 130, The spring 140 mounted between the guide 131 and the diaphragm 111 can be stably positioned at the predetermined position so that the spring 140 can be stably installed on both sides of the diaphragm It does not fall off, A hooking protrusion 132-1 larger than the width of the elongate hole 131-2 is formed on the upper surface edge of the pressing piece 132 inserted into the elongated hole 131-2 of the guide 131 so that the pressing piece 132 The pressing piece 132 is not completely inserted into the guide 131 through the elongated hole 131-2 by the engaging jaw 132-1 even when inserted into the long hole 131-2, A protrusion 131-3 made of a synthetic resin material is formed on the inner side surface in the longitudinal direction of the elongated hole 131-2 so that the elongated hole 131 The projections 131-3 made of synthetic resin formed on the inner surface of the elongated hole 131-2 are forcedly inserted into the groove of the pressing piece 132 when the pressing piece 132 is inserted into the long hole When the pushing piece 132 is inserted into the inside of the body 110 and is protruded outward by the reinforcing bar 200, So that it is possible to perform the connecting operation.

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