JP2012117271A - Connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector which is excellent in workability when installing a beam and is capable of suppressing a product price as well.SOLUTION: The connector includes a column side lag screw 15 screwed to a side face of a column 41, a beam side lag screw 25 concentric with it and screwed to an end of a beam 51, a receiving metal fitting 11 fixed to the side face of the column 41, a latch 21 paired with it and fixed to the end of the beam 51, and a long bolt 36 inserted in both lag screws 15, 25 to draw the beam 51 to the column 41, etc., and cog parts 12, 22 for preventing fall of the latch 21 are provided on one or both of the receiving metal fitting 11 and the latch 21. Thus, the beam 51 can be temporarily placed on the column 41 standing upright from a foundation or the like to provide excellent workability. Also, in the stage that the beam 51 is temporarily placed, the heights of both lag screws 15, 25 are matched and the long bolt 36 is naturally inserted.

Description

  The present invention relates to a connector for installing a beam on a column.

  There are various methods for constructing wooden buildings such as houses, but in Japan, the wooden frame construction method that assembles bars such as pillars and beams is widespread, and in addition, a wooden framework generally called the two-by-four construction method. Wall construction is also spreading. In recent years, with the development of technology such as adhesives, it has become possible to easily produce laminated wood with a large cross-section, and a gate-shaped frame construction method has been developed that has been assembled into a gate shape, such as a three-story wooden house. Use in large buildings is expected. The portal frame construction method has the advantage that a vast indoor space can be secured because the internal pillars can be omitted.

  In the portal frame construction method, a technique as described in the following patent document has been developed as a means for connecting a column and a beam. In this technology, basic hardware is attached to either vertical members (columns) or horizontal members (beams), accessory hardware is attached to the other, a taper is provided on one end of each hardware, and the other end is A receiving part is provided, and the longitudinal member and the transverse member are integrated by fitting both tapered parts into the receiving part of the other party. In order to attach both hardware parts, lag screws are embedded inside the vertical and horizontal members. With this technology, the temporary placement of the cross members can be completed simply by inserting the accessory hardware into the basic hardware during construction, so the usage time of heavy machinery and the like can be shortened. The gap can be eliminated, and the rigidity is also excellent.

JP 2007-132168 A

  For example, FIG. 3 of the patent document discloses that a fastener (drift pin) is driven from the side surface of the cross member in order to fix the accessory to the cross member. In order to drive this fastener, it is necessary to form a plurality of holes in the accessory, which increases the manufacturing cost, and it is sometimes pointed out that the operation of driving the fastener takes time. Moreover, when manufacturing both hardwares, processes such as processing of the tapered portion, welding of the receiving portion, and ensuring accuracy thereof are necessary, and it is difficult to reduce the product price. For this reason, there has been a demand to use a cheaper product when the restriction on the load or the like is relatively loose.

  The present invention has been developed on the basis of such circumstances, and an object thereof is to provide a coupler that is excellent in workability when a beam is installed and that can suppress the product price.

  The invention according to claim 1 for solving the above-mentioned problems is a column-side lag screw screwed into a side hole penetrating a side surface of the column, and a column-side lag screw screwed into a lateral hole provided at an end of a beam. A beam-side lag screw disposed concentrically with the beam, a receiving bracket fixed to the side surface of the column, a hanging bracket fixed to the end of the beam and paired with the receiving bracket, and pulling the beam to the column The beam-side lag screw includes a long bolt and a fixing means for fixing the receiving metal fitting and the hanging metal fitting, and the column-side lag screw is provided with a middle hole through which the long bolt can be inserted. A female screw that is screwed into the long bolt is provided on one end surface of the metal plate, and the receiving metal fitting and the hanging metal metal are provided with a round hole through which the long bolt and the fixing means can be inserted. The hanging bracket On one or both or Re is a connector which is characterized in that is provided with a jaw portion to restrain falling of the hanging metal fitting protrudes in a substantially horizontal direction.

  The present invention is used at a place where columns and beams are connected in an L shape in a gate-shaped frame construction method in which large cross-section timbers are assembled in a gate shape. It is assumed that the end face of the beam is in contact with the side surface of the column, and a receiving metal fitting and a hanging metal fitting are sandwiched between the side surface of the column and the end of the beam. Furthermore, the column and beam are integrated with long bolts, and in order to achieve this, a lag screw is screwed into the column and beam. In addition, some fixing means is used to fix the receiving metal fitting and the hanging metal fitting to the column or beam.

  The column-side lag screw and the beam-side lag screw are screwed into the column and the beam in order to insert a long bolt. The lag screw has a cylindrical shape made of metal, and protrusions protrude from the side peripheral surface, which extend in a spiral shape. As the ridges bite into the wood, the lag screw is firmly integrated with the wood and can also restrain the aging of the wood. Furthermore, when a load in the axial direction acts on the lag screw, this is transmitted to the wood with the entire ridge, so that cracking of the wood can be prevented.

  The column-side lag screw is screwed into a side hole that penetrates the side of the column, and the beam-side lag screw is screwed into a horizontal hole starting from the end of the beam. Side holes and side holes are processed so that is concentric. Furthermore, the column side lag screw is provided with an inner hole penetrating both end surfaces so that the shaft portion of the long bolt can be inserted, and the beam side lag screw has one end surface so that it can be screwed with the long bolt. A female screw is provided at the center of the head.

  The long bolt is for pulling the beam to the column and bringing the end face of the beam into close contact with the side surface of the column. Screw the column-side lag screw and beam-side lag screw into the column and beam, respectively, and then insert the long bolt into the center hole of the column-side lag screw and screw the tip of it into the female screw of the beam-side lag screw and tighten it. And the beam is drawn to the pillar and integrated. Thus, by inserting a long volt | bolt via a lag screw, the axial force which generate | occur | produces in a long volt | bolt is received by both lag screws, and can reduce the pressure which acts on wood. The long bolts are premised on the use of two or more long bolts in one set of connectors, and are preferably arranged near the upper and lower surfaces of the beam in order to resist bending moments.

  The receiving metal fitting and the hanging metal fitting have a shape in which a steel material is cut into a band shape, and are sandwiched between the pillar and the beam in pairs, and have a function of transmitting a downward load acting on the beam to the column. The bracket is fixed to the side of the column, and the hanging bracket is fixed to the end of the beam, but both brackets should be arranged in the vertical direction as an extension almost equal to the height of the beam. It is assumed. However, the horizontal width of both metal fittings is often made smaller than the horizontal width of the beam, and a vertical groove is machined in the center of the end face of the beam, and both metal fittings are embedded in the inside. In addition, it is assumed that the back surfaces of both metal fittings are brought into contact with end faces of lag screws screwed into columns and beams. Therefore, both metal fittings are provided with round holes at predetermined positions, and long bolts can be inserted therethrough.

  The jaw part is a part that protrudes almost horizontally from the receiving bracket and the hanging bracket, and when the receiving bracket and the hanging bracket are paired, contact the other bracket to prevent the hanging bracket from falling, Furthermore, it has a function of receiving a downward load acting on the hanging bracket and transmitting it to the bracket. Note that the jaw portion may be provided only on the receiving bracket, only on the hanging bracket, or on both. If the jaw portion is provided only on the hanging metal fitting, the upper end portion thereof is projected horizontally to form an jaw portion, which is then brought into contact with the upper end surface of the fitting. In addition, the jaw part may be provided with a certain degree of inclination so that the counterpart metal fitting can be guided in the contact direction.

  The fixing means is for attaching a receiving metal fitting or a hanging metal fitting to a column or beam, and specific examples thereof include bolts and screw nails. This fixing means does not have to be able to simply fix the metal fitting, but needs to be strong enough to receive the vertical load acting on the metal fitting, and a plurality of fixing means are often used for one metal fitting. If a bolt is used as the fixing means, an embedded tool that is screwed with the bolt is embedded in a column or beam. The buried tool is a cylindrical metal bar or a lag screw provided with a female screw at one end. In order to insert fixing means such as bolts, both metal fittings are provided with round holes at predetermined positions.

  In this way, with regard to the pillar-to-beam connector, by providing the jaw on either or both of the receiving bracket and the hanging bracket, the beam is temporarily placed by the jaw when the beam is installed on the pillar upright from the foundation. be able to. Furthermore, when the beam is temporarily placed, the column side lag screw and the beam side lag screw will inevitably have the same height due to the jaws, so the column side lag screw's inner hole and the beam side lag screw's female thread can be easily It can be concentric, and a column and beam can be connected without difficulty by inserting a long bolt.

  The invention according to claim 2 relates to the shape of the receiving metal fitting and the hanging metal fitting, and either one or both of the receiving metal fitting and the hanging metal fitting is provided with a hanging metal fitting or receiving metal metal that closes both side surfaces of the jaw portion and is paired. A guideable side rib is provided. The side rib is a triangular steel plate that connects the side surface of the jaw portion protruding in an L shape and the vicinity thereof, and is attached to both side surfaces of the metal fitting by welding.

  By providing the side ribs on both the left and right side surfaces, the mating metal fitting is sandwiched between the side ribs when the receiving metal fitting and the hanging metal fitting are paired. Therefore, the horizontal displacement of both metal fittings can be eliminated, and the column-side lag screw and the beam-side lag screw are necessarily aligned so that the long bolt can be inserted without difficulty. The side ribs do not receive the downward load acting on the beam, but serve only as a guide during construction, and do not require high quality control.

  As in the first aspect of the invention, the bracket is attached to the column using a fixing means such as a bolt, the hanging bracket is similarly attached to the beam, the column side lag screw is further screwed into the column, and the beam side is In the coupler that screw in the lag screw and integrate both with long bolts, provision of the jaw on either or both of the receiving bracket and the hanging bracket makes it possible to temporarily place the beam and excels in workability. ing. When the beam is temporarily placed, the height of the column side lag screw and the beam side lag screw inevitably coincide. Therefore, the inner hole of the column-side lag screw and the female screw of the beam-side lag screw can be easily aligned, and a long bolt can be inserted without difficulty, which is also excellent in workability.

  In addition, both lag screws and long bolts can be diverted to general-purpose products, and the product price can be reduced. Also, the brackets and hanging brackets are cut out from thick steel plates and bent at one end to form jaws and round on the sides. Manufacture can be performed simply by forming a hole, and operations such as welding and cutting can be simplified. In this respect as well, the product price can be suppressed. In addition, the present invention receives the bending moment acting on the beam with a long bolt and the downward load acting on the beam with both metal fittings, and the load acting on the connecting portion can be dispersed widely. Aging deformation of columns and beams can be suppressed.

  As in the second aspect of the invention, by providing the side ribs so as to close both side surfaces of the jaw portion, when the receiving metal fitting and the hanging metal fitting are paired, the counterpart metal fitting is guided inside the side rib. Therefore, the horizontal displacement of the receiving metal fitting and the hanging metal fitting is eliminated, and the long bolt can be inserted without any trouble, so that the working time can be expected to be shortened. Although the side ribs need to be welded, a vertical load is not applied to the side ribs themselves, so that high quality control is unnecessary, and an increase in manufacturing costs can be suppressed.

It is a perspective view which shows the structural example of the coupling tool by this invention, and its use condition. FIG. 2 is a perspective view showing a state immediately after mounting each component of FIG. 1 and immediately before installing a beam on a column. It is a longitudinal cross-sectional view of the center part after connecting the pillar and beam of FIG. It is a perspective view which shows the form which made the receiving metal fitting the simple plate shape. It is a perspective view which shows the form which used the screw nail as a fixing means. It is a perspective view which shows the form which provided the side rib in the jaw part of the receiving metal fitting and the hanging metal fitting. It is a perspective view which shows the example of the shape of the jaw part and its periphery of a receiving metal fitting and a hanging metal fitting.

  FIG. 1 shows an example of the structure of a connector according to the present invention and how it is used. In this figure, the upper side surface of the column 41 and the end surface of the beam 51 are connected in an L-shape, and the beam 51 is drawn to the column 41 by a long bolt 36, and the receiving metal 11 and the hanging metal 21 are in contact with each other. By transmitting downwards. Further, in order to attach the receiving metal 11 and the hanging metal 21, the embedding tool 30 is embedded in the column 41 and the beam 51.

  In order to insert the long bolt 36, two column side lag screws 15 are screwed into the column 41. For this reason, side holes 43 penetrating both sides are processed in two places on the side surface of the column 41. The column-side lag screw 15 is a metal columnar shape, and the protruding ridge 16 extending in a spiral shape protrudes on the side circumferential surface thereof. Fixed to. The column-side lag screw 15 has a hexagonal shape on one end surface for applying a tool when screwed, and an inner hole 17 penetrating both ends is formed at the center.

  In addition to the column side lag screw 15, two embedded tools 30 are embedded in the side surface of the column 41. The embedding tool 30 is arranged side by side between the upper and lower pillar-side lag screws 15 and is used to receive a vertical load acting on the receiving metal fitting 11 and is a simple columnar shape made of metal. The screw hole 31 is formed in the center. In order to embed the embedding tool 30, two bottomed holding holes 44 having the same diameter as the embedding tool 30 are formed on the side surface of the column 41.

  A longitudinal groove 52 is machined in the center of the end face of the beam 51, and both the metal fittings 11 and 21 are accommodated therein. Similarly to the column 41, the beam side lag screw 25 is screwed into the end portion of the beam 51, and the embedment tool 30 is embedded, and the horizontal hole 53 and the holding hole 54 are processed in the depth of the vertical groove 52. Both the horizontal hole 53 and the holding hole 54 are bottomed. In addition, the beam-side lag screw 25 is formed with a female screw 27 at the center of one end so that the long bolt 36 can be screwed together.

  The receiving metal 11 and the hanging metal 21 are formed by projecting one end of a strip-shaped thick steel plate to form the jaw portions 12 and 22 and have an L-shaped appearance. The receiving metal 11 and the hanging metal 21 shown in FIG. Are the same shape and are used upside down. Since the individual jaw portions 12 and 22 come into contact with the end surfaces of the counterpart metal fittings 21 and 11, the hanging metal fitting 21 can be prevented from falling. Furthermore, both the metal fittings 11 and 21 are fixed to the embedding tool 30 via bolts 33 which are fixing means, and the back surfaces thereof are in contact with the side surfaces of the columns 41 and the back of the vertical grooves 52.

  As shown in the figure, the receiving metal 11 and the hanging metal 21 are incorporated in the boundary between the column 41 and the beam 51 in a vertically long state, and the total length thereof is slightly shorter than the height of the beam 51. In addition, round holes 13, 14, 23, and 24 are provided in the metal fittings 11 and 21 so that the long bolt 36 and the bolt 33 can be inserted. In addition, the round holes 14 and 24 for inserting the bolt 33 have an inner diameter that changes in the middle so that the head of the bolt 33 can be accommodated.

  The column side lag screw 15 and the beam side lag screw 25 need to be concentric in a state where the column 41 and the beam 51 are connected, and the side hole 43 and the side hole 53 for screwing them need to be processed with high accuracy. . Also, the holding holes 44 and 54 for attaching the receiving metal 11 and the hanging metal 21 need to be processed with high accuracy so that no error occurs in the installation height of the beam 51. The buried tool 30 does not need to be concentric on the column 41 side and the beam 51 side, but is concentric in this figure.

  FIG. 2 shows a state immediately after mounting the components shown in FIG. A column side lag screw 15 is screwed into the column 41, and an embedded tool 30 is embedded therein. The metal fitting 11 is fixed to the side surface of the column 41 with a bolt 33 that is screwed into the embedding tool 30 with the jaw portion 12 facing downward. In this state, the round hole 13 of the metal fitting 11 and the column side lag screw 15 are concentric, and the long bolt 36 can be inserted.

  Similarly for the beam 51, the beam side lag screw 25 is screwed into the depth of the vertical groove 52, and the embedding tool 30 is embedded. In addition, the metal fitting 21 is fixed in the vertical groove 52 with the jaw portion 22 facing upward. Thus, after fixing the receiving metal 11 to the column 41 and fixing the hanging metal 21 to the beam 51, the column 41 is installed on the foundation or the like. Next, when the beam 51 is lifted and the both jaws 22 and 12 are brought into contact with the end surfaces of the counterpart metal fittings 11 and 21, the beam 51 is temporarily placed via the metal fittings 11 and 21. After that, when the displacement between the side surface of the column 41 and the side surface of the beam 51 is removed, and the long bolt 36 is inserted and tightened from the column 41 toward the beam 51, the beam 51 is pulled toward the column 41, and the beam 51 is installed. Complete.

  FIG. 3 shows a longitudinal section of the central part after the column 41 and the beam 51 of FIG. 1 are connected. As described above, the receiving metal 11 and the hanging metal 21 are accommodated in the vertical groove 52 at the center of the column 41 and the beam 51. However, outside the vertical groove 52, the end surface of the beam 51 is in contact with the side surface of the column 41. Further, the lower end surface of the hanging bracket 21 is in contact with the jaw portion 12 of the receiving bracket 11, and the jaw portion 22 of the hanging bracket 21 is in contact with the upper end surface of the receiving bracket 11, and is directed downwardly acting on the beam 51. The load is transmitted to the column 41 via both jaw portions 12 and 22.

  The receiving metal 11 and the hanging metal 21 are fixed to the column 41 and the beam 51 by the bolt 33 and the embedded tool 30, and the embedded tool 30 receives the vertical load acting on both the metal parts 11 and 21. The buried tool 30 is fixed in the column 41 and the beam 51 only by friction with the holding holes 44 and 54, but no load is applied in the axial direction after construction, and there is no problem in strength. .

  The column side lag screw 15 and the beam side lag screw 25 are integrated by a long bolt 36 inserted in the center thereof. By tightening the long bolt 36, the lug screws 15 and 25 are attracted with the receiving metal 11 and the hanging metal 21 being sandwiched, and the rigidity of the connecting portion is maintained by the contact of these metal parts. Further, the tensile load acting on both the lag screws 15 and 25 is transmitted to the column 41 and the beam 51 through the ridges 16 and 26. Therefore, it is possible to prevent an excessive pressure from acting on the column 41 and the beam 51, and the secular deformation is suppressed.

  FIG. 4 shows a form in which the receiving metal 11 is a simple plate. The configuration of this figure is almost the same as that of FIG. 1, but the receiving metal 11 is a simple plate and the jaw portion 22 is provided only at the upper end of the hanging metal 21. When the beam 51 is temporarily placed, the jaw portion 22 contacts the upper end surface of the metal fitting 11. In addition, the burying tool 32 is not a simple columnar shape as shown in FIG. 1 but a lag screw shape in which a ridge 34 is formed on the side peripheral surface, and when the bolt 33 is inserted, it is prevented from being pulled out from the holding holes 44 and 54. is doing. It should be noted that an excessive tensile load does not act on the burying tool 32, and the overall length is suppressed more than the column side lag screw 15 or the like.

  FIG. 5 shows a form using screw nails 35 as fixing means. In order to receive a vertical load acting on the metal fitting 11 and the hanging metal 21, a columnar burying tool 30 as shown in FIG. 1 is often embedded in the column 41 and the beam 51, and the load is often distributed over a wide range. However, when the load acting on the beam 51 is relatively small, a screw nail 35 or the like may be used as a fixing means in order to simplify the structure. In this figure, three screw nails 35 are used on each side so as to resist vertical loads. Moreover, the round holes 14 and 24 are formed in both the metal fittings 11 and 21 so that the screw nail 35 can be penetrated. The inner diameters of the round holes 14 and 24 change midway, and the heads of the screw nails 35 can be embedded.

  In addition, the hanging bracket 21 in this figure has a simple plate shape, and the jaw portion 12 is provided only at the lower end of the receiving bracket 11. The two column side lag screws 15 are screwed into the column 41, the two beam side lag screws 25 are also screwed into the beam 51, and these are pulled together by the long bolts 36, which is exactly the same as in FIG. . As shown in this figure, by using the screw nails 35 as the fixing means, the burying tool 30 or the like is not necessary, and the cost can be further reduced.

  FIG. 6 shows a form in which the side ribs 19 and 29 are provided on the jaw portions 12 and 22 of the receiving metal 11 and the hanging metal 21. After the beam 51 is temporarily placed using the jaws 12 and 22, when inserting the long bolt 36, it is necessary to remove the horizontal displacement between the receiving metal 11 and the hanging metal 21. In order to simplify this work, plate-like side ribs 19 and 29 are attached to both side surfaces of the jaw parts 12 and 22, and the tips of the pair of metal fittings 21 and 11 enter into the metal parts 11, 21 horizontal displacements can be eliminated. In consideration of the other party entering between the side ribs 19 and 29, both the metal fittings 11 and 21 are provided with slopes 18 and 28 whose side portions are cut obliquely on the opposite side of the jaw portions 12 and 22, respectively. The tip has a wedge shape.

  Although the side ribs 19 and 29 are attached by welding, a vertical load does not act on them, and after the column 41 and the beam 51 are connected, no function is exhibited. Therefore, the side ribs 19 and 29 only need to have a strength capable of guiding the slopes 18 and 28 during construction. Note that the lug screws 15 and 25 are screwed into the column 41 and the beam 51 and the column 41 and the beam 51 are connected by the two long bolts 36, or two embedded tools 30 are provided on both the column 41 and the beam 51. Is embedded in the same way as FIG.

  FIG. 7 shows an example of the shape of the jaws 12 and 22 of the receiving metal 11 and the hanging metal 21 and the periphery thereof. The jaw portion 12 of the metal fitting 11 protrudes upward with a large bending angle. The lower end surface of the metal fitting 21 that comes into contact with the jaw portion 12 is not a simple horizontal plane but a slope 38, and when this comes into contact with the jaw portion 12, both the metal fittings 11 and 21 can be brought into close contact with each other. Next, as for the jaw part 22 of the hanging metal fitting 21, only the center part of the upper end protrudes in the horizontal direction, and a concave part 37 into which the jaw part 22 is fitted is formed on the upper surface of the receiving metal fitting 11. The concave portion 37 has a shape in which the upper portion is widely opened in order to smoothly receive the jaw portion 22. When the jaw portion 22 is fitted into the concave portion 37, the horizontal displacement of both the metal fittings 11, 21 is inevitably caused. Can be eliminated.

  In this figure, only one embedding tool 30 is embedded in both the column 41 and the beam 51. Therefore, at the time of construction, there is a possibility that the metal fittings 11 and 21 rotate with the embedded tool 30 as the origin. In order to prevent this, a simple nail 39 is used in combination with the bolt 33 as a fixing means. The round hole 14 has a different shape depending on the application. In addition, the point that the column 41 and the beam 51 are connected by two long bolts 36 is the same as FIG.

11 Bracket 12 Jaw part (bracket)
13 Round hole (for metal fittings and long bolts)
14 Round hole (for metal fittings and fixing means)
15 Column side lag screw 16 ridge (column side lag screw)
17 Medium hole (column side lag screw)
18 Slope (back bracket)
19 Side rib (receiving bracket)
21 hanging bracket 22 jaw (hanging bracket)
23 Round hole (for hooks and long bolts)
24 round holes (for metal fittings and fixing means)
25 Beam side lag screw 26 Projection (beam side lag screw)
27 Female thread (beam side lag screw)
28 Slope (hanging bracket)
29 side rib (hanging bracket)
30 buried tool (cylindrical)
31 Screw hole (burial tool)
32 Buried tools (lag screw type)
33 bolts (fixing means)
34 Convex strip (burial)
35 Screw nails (fixing means)
36 Long bolt 37 Recess 38 Slope (underside of hanging bracket)
39 Nails (fixing means)
41 Pillar 43 Side hole 44 Holding hole (pillar)
51 Beam 52 Vertical groove 53 Horizontal hole 54 Holding hole (beam)

Claims (2)

A column side lag screw (15) screwed into a side hole (43) penetrating the side surface of the column (41);
A beam side lag screw (25) screwed into a lateral hole (53) provided at an end of the beam (51) and disposed concentrically with the column side lag screw (15);
A metal fitting (11) fixed to the side surface of the column (41);
A hanging metal fitting (21) fixed to the end of the beam (51) and paired with the receiving metal fitting (11),
A long bolt (36) for pulling the beam (51) to the column (41);
Fixing means (33, 35, 39) for fixing the receiving metal fitting (11) and the hanging metal fitting (21);
Consists of
The column side lag screw (15) is provided with an inner hole (17) into which the long bolt (36) can be inserted,
On one end surface of the beam side lag screw (25), a female screw (27) to be screwed with the long bolt (36) is provided,
The receiving metal fitting (11) and the hanging metal fitting (21) have round holes (13, 14, 23, 24) into which the long bolt (36) and the fixing means (33, 35, 39) can be inserted. Provided,
One or both of the receiving metal fitting (11) and the hanging metal fitting (21) are provided with jaw portions (12, 22) that protrude in a substantially horizontal direction and prevent the hanging metal fitting (21) from dropping. A connector characterized by that. Either one or both of the receiving metal fitting (11) and the hanging metal fitting (21) may be formed by closing the both side surfaces of the jaw portion (12, 22) and pairing the hanging metal fitting (21) or the receiving metal fitting ( 11. The coupling device according to claim 1, further comprising side ribs (19, 29) capable of guiding 11).

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