JP4460756B2 - Tightening device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fastening device in which two or more clamp members used for construction or agriculture are connected.
[0002]
[Prior art]
Conventionally, an orthogonal type and a universal type have been used as a connection type of a fastening device that connects two or more materials such as H-shaped steel and steel pipe with a plurality of connected clamp members.
The orthogonal type, for example, fixes the fixed pieces of the clamp member having a fixed piece and a movable piece in a state where the gripping directions are orthogonal to each other, and the universal type connects the fixed pieces so as to be rotatable. It was.
In temporary construction, it was necessary to prepare a predetermined number of fastening devices having various shapes and sizes depending on the place of use, so it became desirable to reduce the types of fastening devices. There has been proposed a binding device that can also be used for both.
For example, as shown in FIG. 10, a universal clamp 80 described in Japanese Patent Application Laid-Open No. 08-082091 includes a first clamp device 84 that fixes a fixed piece 81 and a movable piece 82 with a fastening member 83, and a fixed piece 85. And a second clamp device 88 that fixes the movable piece 86 with a fastening member 87, and the fixed pieces 81 and 85 of the first and second clamp devices 84 and 88 can be rotated via the connecting portion 95. It is linked to. In addition, a latching means 89 is rotatably provided at both ends of the shaft 92 that rotatably holds the fastening member 83 at one end of the fixed piece 81, and the leading end 90 of the latching means 89 is fixed to the fixed piece 85. The first clamping device 84 and the second clamping device 88 are engaged with the latching recess 91 formed in the above structure, and can be fixed with their clamping directions orthogonal to each other.
[0003]
[Problems to be solved by the invention]
However, in the conventional universal clamp 80, since the latching means 89 is rotatably provided on the shaft 92, the latching means 89 can be easily attached to and detached from the latching recess 91, but the engagement state is low. The latching means 89 and the latching recess 91 are unstable and are liable to be detached.
Moreover, the backlash of the rotating part of the connection part 95 and the latching means 89 becomes large by repeated use over a long period of time, and the relative relationship between the first and second clamping devices 84 and 88 when the latching means 89 is engaged. The gap in the clamping direction was out of the allowable range and could not be used.
Furthermore, since the latching recess 91 can be formed only on the opposite side walls 93 and 94 of the fixing piece 85, the first and second clamping devices 84 and 88 are fixed only in the direction orthogonal to the respective clamping directions. I couldn't.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fastening device that can be reliably fixed while suppressing rattling and that can arbitrarily set the fixing direction.
[0004]
[Means for Solving the Problems]
The binding device according to the present invention that meets the above-described object has the first and second joining flat portions formed on the first and second clamping members sandwiching different members, respectively, and the first and second joining members. The joint flat part of 2 is connected by the connection member, The said 1st clamp member is a beam clamp which clamps H-section steel, a rectangular member, or a board | plate material, Comprising: From the tube clamp with which the said 2nd clamp member clamps a pipe | tube In the tightening device
The first and second joining flat portions are respectively formed on the beam clamp fixing frame and the tube clamp fixing frame,
The coupling member includes a shaft portion whose base side is fixed to the first joint flat portion, a diameter- increased head that is integrally formed on the front side of the shaft portion and has a diameter larger than that of the shaft portion , and On the outer periphery of the enlarged head, four engaging portions each having a notch with the entrance side gradually expanding from the back side are formed every 90 degrees ,
The tube clamp is rotatably attached to the shaft portion through a through-hole formed in the second joint flat portion, and is attached to a fixed frame of the tube clamp in which the second joint flat portion is formed. Is provided with a female threaded portion facing the enlarged diameter head and parallel to the second joining flat part, and the female threaded portion is fitted with one of the four engaging portions of the connecting member. The male screw member to be screwed from the outside ,
The base metal fixture and fastening member of the beam clamp sandwich the H-shaped steel, rectangular member or plate material,
The fixed frame of the beam clamp is U-shaped and has the first joint flat part at the center part, and the base metal fitting is rotatably attached to both sides thereof via fixing pins. It has a positioning piece that comes into contact with a shaped steel, a rectangular member or a plate,
Stoppers for stopping the base metal fixture of the beam clamp at a 90-degree rotation position are formed on both front and rear sides of the first joint flat portion.
[0005]
Here, the first and second bonded flat portions are not limited to completely flat plate-like portions, and include portions having irregularities as necessary.
The number of the hooking portions and the arrangement positions can be provided at four positions every 90 degrees.
The internal thread portion may be formed directly on the fixed frame, or another member on which the internal thread portion is formed can be attached to the fixed frame.
The connecting member can be manufactured by, for example, cutting, forging, casting, or the like.
[0006]
The fixing of the shaft portion of the connecting member to the first joint flat portion can be performed, for example, by welding, caulking, or the like.
Since the front portion of the male screw member is fitted into the engaging portion formed by the notch, the generation of rattling can be suppressed and securely fixed by fastening the male screw member to the female screw portion.
Furthermore, since the tip of the male screw member is fitted in the engaging portion, even when torque is applied to the first and second clamp members with the male screw member slightly loosened, the circumferential play remains small. The second clamp member can be held.
[0007]
Moreover, it is also possible to enlarge the entrance side of the engaging part from the back side and form a guide part on the entrance side.
The entrance side means the outside in the radial direction of the engaging portion.
With this configuration, even when the center of the engaging portion and the axis of the male screw member are misaligned, the tip of the male screw member can be guided along the guide portion to the back side of the engaging portion, and the second clamp member can be guided to the first clamp. The operability when fixing to the member can be improved.
Moreover, it is also possible to fix the base side of the connecting member to the first joining flat part by one or more rivets penetrating the connecting member in the axial direction.
For example, when the number of rivets is one, it is preferable to provide a rotation stopper in addition to the rivets. Since it is fixed by rivets, it can be manufactured more easily than by welding.
[0008]
Moreover, it is also possible to fix the said connection member and the said 1st joining flat part by crimping the projection part formed in the base end part of the said connection member.
For example, an attachment hole that matches the position of the protrusion is formed in the first joint flat part, and the protrusion through which the attachment hole is inserted is caulked in the same manner as the fixing with the rivet, thereby 1 flat junction can be fixed. The number of protrusions is, for example, 1 or 2 or more.
With this configuration, it is possible to reduce the number of parts and save the labor of manufacturing.
In addition, the female screw portion can be formed on a nut member that is fixed to an insertion hole portion that is formed through the fixed frame so that its axial center position is aligned.
The nut member can be provided on the inner side or the outer side of the fixed frame, and can also be provided so as to penetrate through the insertion hole.
Since the female screw portion is formed on the nut member, the length of the female screw portion can be increased to improve the holding strength of the male screw member.
[0009]
Further, the female screw portion can be formed in a punched hole with a burr portion formed in advance at a predetermined position of the fixing frame of the tube clamp.
The burr can be provided outside or inside the fixed frame.
Since the burr portion (also referred to as burring) is formed, the length of the female screw portion can be formed longer than the thickness of the fixed frame, and the holding strength of the male screw member can be improved.
Moreover, it is also possible to make the outer dimension of the head of the male screw member the same as the outer dimension of the fastening nut provided on the first clamp member or the second clamp member.
The same outer dimension means that the size of the head portion of the male screw member and the portion of the fastening nut held by the tool are substantially the same.
With this configuration, it is not necessary to change tools such as a spanner to be used, and operations can be performed quickly.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
[0011]
As shown in FIGS. 1 to 3, the binding device 10 according to the first embodiment of the present invention is a pipe that is an example of a first clamp member that sandwiches steel pipes 21 and 21 a that are examples of different members. The first and second joint flat portions 13 and 14 formed on the clamp 11 and the tube clamp 12 which is an example of the second clamp member are brought into contact with each other, and the first and second joint flat portions 13 and 14 are brought into contact with each other. Are connected by a connecting member 15. This will be described in detail below.
First, the tube clamps 11 and 12 will be described.
Since the basic structures of the tube clamps 11 and 12 are the same, the tube clamp 12 will be described here. In addition, about the tube clamp 11, only a different part from the tube clamp 12 is demonstrated, the same number is attached | subjected to the same member and description is abbreviate | omitted.
[0012]
The tube clamp 12 includes a fixed piece 16 that is an example of a fixed frame provided with a second joining flat portion 14, and a movable piece whose base is rotatably attached to one end of the fixed piece 16 via a support shaft 17. 20, a rotation bolt 19 rotatably attached to the other end of the fixed piece 16 via a support shaft 18, and a threaded engagement with the rotation bolt 19 to be hooked on the tip of the movable piece 20. It has a fastening nut 30 for fixing a steel pipe 21a having a predetermined diameter (for example, 40 to 50 mm).
A through hole 22 is formed in the second bonding flat part 14, and the tube clamp 12 can be rotatably mounted on the shaft part 31 formed on the base side of the connecting member 15 via the through hole 22. Yes.
Among the side wall parts 23 to 25 formed by bending the periphery of the second bonding flat part 14 of the fixed piece 16, the side wall parts 23 and 25 arranged in parallel are connected to the lower part of the side wall part 24 arranged to be inclined. Is formed with a female screw portion 26 substantially parallel to the second joining flat portion 14 and toward the axial center of the through hole 22, and a male screw member 29 is screwed into the female screw portion 26 from the outside. . The external dimension of the head of the male screw member 29 is formed to be the same size as the external dimension of the fastening nut 30 provided on the tube clamp 11 or the tube clamp 12.
[0013]
On the other hand, the fixed piece 27, which is an example of a fixed frame in which the first joining flat portion 13 of the tube clamp 11 is formed, has substantially the same shape as the fixed piece 16, but is a through hole formed in the fixed piece 16. The hole 22 and the female screw portion 26 are not formed. Further, four attachment holes 28 used for fixing the connecting member 15 are formed in the first joining flat portion 13. The tube clamp 11 can fix the steel tube 21.
[0014]
Next, the connection member 15 is demonstrated with reference to FIGS. 1-4 (A) and (B).
The connecting member 15 is formed integrally with the shaft portion 31 whose base side is fixed to the first joining flat portion 13 and the front side of the shaft portion 31, and has a substantially larger diameter than the shaft portion 31, There are provided enlarged-diameter heads 33 each having hooking portions 32 formed of notches equally arranged at four locations.
The engaging portion 32 is formed in a groove shape in which the radially outer side gradually expands from the rear side, and guide portions 34 and 35 are formed on both sides in the circumferential direction on the inlet side. A half-extracted portion 36 having substantially the same diameter as that of the shaft portion 31 is formed on the enlarged-diameter head portion 33 of the connecting member 15. Further, an insertion hole 37 is formed in the half punched portion 36 at a position where it overlaps with the mounting hole 28 of the first joint flat portion 13 of the tube clamp 11 so as to penetrate the enlarged diameter head portion 33 and the shaft portion 31. ing.
The connecting member 15 is manufactured by subjecting a plate material matched to the thickness T1 of the enlarged diameter head 33 to press working.
First, the plate material is punched in accordance with the outer shape of the enlarged diameter head 33, and then the half punched portion 36 and the shaft portion 31 are formed by half punching. The insertion hole 37 is formed by punching before or after the outer shape is formed or simultaneously with the outer shape.
The thickness T1 of the enlarged diameter head 33 is set so that the level L1 of the upper end surface of the connecting member 15 when attached to the tube clamp 11 is smaller than the level L2 of the lower end portion of the steel pipe 21a attached to the tube clamp 12. ing. Further, the length T2 of the shaft portion 31 is formed to be slightly larger than the thickness of the second joint flat portion 14 so that the second joint flat portion 14 can be rotated.
Further, the connecting member 15 is formed so as to have a thickness T3 smaller than the diameter D1 of the shaft portion 31. Since the connecting member 15 is thin, the influence of the torque acting on the enlarged diameter head 33 is reduced to prevent the connecting member 15 from being deformed and damaged.
[0015]
Next, the connection state of the tube clamps 11 and 12 using the connecting member 15 will be described with reference to FIGS.
The base side of the connecting member 15 is inserted into the first joint flat portion 13 of the tube clamp 11, the insertion hole 37 penetrating the connecting member 15 in the axial direction, and the attachment hole 28 formed in the first joint flat portion 13. It is fixed by four rivets 38 to be inserted. The insertion and caulking direction of each rivet 38 is arbitrary.
The tube clamp 11 is attached to the shaft portion 31 before the rivet 38 is crimped.
After the rivet 38 is caulked, the tube clamp 12 is restricted from moving in the axial direction by the enlarged-diameter head 33 and can turn around the shaft portion 31.
[0016]
Next, the operation of the tube clamps 11 and 12 will be described.
The male screw member 26 of the tube clamp 12 and the male screw member 29 that engages with the female screw portion 26 are provided toward the center of the diameter-increased head portion 33 of the connecting member 15 that is fitted into the through hole 22. It can be fitted into one of the four engaging portions 32 provided on the outer periphery of the enlarged diameter head 33.
The outer peripheral portion at the tip of the male screw member 29 fitted into the engaging portion 32 abuts on one of the guide portions 34 and 35 of the enlarged diameter head 33 and is guided to the back side of the engaging portion 32. When the male screw member 29 is further tightened, the tip of the male screw member 29 comes into contact with the guide portions 34 and 35 on both sides and stops.
[0017]
Even if it is attempted to rotate the tube clamp 11 with respect to the tube clamp 12 in this state, the force applied in the circumferential direction of the enlarged diameter head 33 is received by the male screw member 29 in contact with the guide portions 34 and 35. 11 and 12 can be securely fixed while maintaining a predetermined angle.
Here, even if the male screw member 29 is used in a slightly loose state, when the tube clamps 11 and 12 are rotated relatively, either one of the guide portions 34 and 35 comes into contact with the male screw member 29. , No big rattle.
Further, even when the fastening device 10 is repeatedly used for a long period of time, since there are few rotating portions, rattling is unlikely to occur, and even when the backlash between the tube clamps 11 and 12 becomes large, the male screw member 29 Can be tightened until it abuts against the guide portions 34 and 35, so that the slack generated by repeated use can be easily absorbed.
[0018]
In the state where the male screw member 29 is loosened, the tube clamps 11 and 12 can rotate relatively freely.
Moreover, since the engaging part 32 is provided every 90 degree | times, the steel pipes 21 and 21a clamped with the fastening apparatus 10 can be hold | maintained orthogonally or in parallel.
The steel pipes 21 and 21a can be held orthogonally or in parallel only by providing the hooking portions 32 at two places, but the pipe clamps 11 and 12 are fixed every 90 degrees because they are provided at four places. Therefore, the operability of the binding device 10 can be improved.
[0019]
Next, with reference to FIGS. 5 and 6, a binding device 39 according to a second embodiment of the present invention will be described.
The tightening device 39 is a beam clamp 40 that is an example of a first clamp member that holds a rectangular member or plate material such as H-shaped steel or a beam material instead of the tube clamp 11 of the tightening device 10 according to the first embodiment. Since the other members are the same as those of the fastening device 10, the same members are denoted by the same reference numerals and description thereof is omitted.
The beam clamp 40 has a sandwiching portion 41 and a support portion 42 arranged in parallel, and is arranged perpendicular to the sandwiching portion 41 and the support portion 42, and the base end side of each of the sandwiching portion 41 and the support portion 42 is connected by a connecting portion 43. Between the integrally connected base metal 48 and a female screw hole 44 formed on the front side of the support part 42, and provided so as to be able to advance and retreat toward the front side of the holding part 41. For example, a fastening member 46 that can hold a rectangular member (an example of a member) 55 and a holder 49 that is an example of a fixing frame that is rotatably attached to a fixing pin 47 provided at a base end portion of the holding portion 41 are provided. is doing.
[0020]
The holder 49 is formed by bending a strip-like plate into a U-shape, and a first joint flat part 50 is formed at the center, and on both sides of the base metal object 48 of the first joint flat part 50. Positioning pieces 53 and 54 are formed. The fixing pin 47 is attached so as to penetrate through the intermediate portion between the positioning pieces 53 and 54.
Further, stopper portions 51 and 52 are formed on both sides of the first joining flat portion 50 with the fixing pin 47 as a reference, and the holder 49 can be rotated in a range of 90 degrees.
For example, as shown in FIG. 5, when the positioning pieces 53 and 54 of the holder 49 are arranged in parallel to the connecting portion 43 and the rectangular member 55 is fixed, one side of the positioning pieces 53 and 54 of the holder 49 ( The end portion 56 on the stopper portion 52 side contacts the rectangular member 55, and the stopper portion 52 contacts the clamping portion 41.
[0021]
In addition, as shown in FIG. 6, when the positioning pieces 53 and 54 of the holder 49 are arranged in parallel to the sandwiching portion 41 and the rectangular member 55 is fixed to the beam clamp 40, the positioning pieces 53 and 54 of the holder 49. The end portion 57 on the other side (stopper portion 51 side) contacts the rectangular member 55, and the stopper portion 51 contacts the connecting portion 43.
In the state shown in FIG. 5, the tube clamp 12 attached to the second joining flat portion 50 can be fixed by rotating 90 degrees around the advancing and retreating direction of the fastening member 46 of the beam clamp 40. In the state shown in FIG. 6, the fastening member 46 can be fixed by rotating by 90 degrees about the direction orthogonal to the advancing / retreating direction of the fastening member 46.
[0022]
Next, the connection member 58 according to the modification will be described.
As shown in FIGS. 7A and 7B, the connecting member 58 is integrally provided with a shaft portion 61 on a cylindrical enlarged diameter head portion 60 on which a hook portion 59 is formed, and the base end of the shaft portion 61. The four protrusions 62 are formed in the same.
The protruding portion 62 has the same shape as the portion protruding from the proximal end of the shaft portion 31 when the rivet 38 used in the binding device 10 according to the first embodiment is inserted into the insertion hole 37 of the connecting member 15. It is formed. The outer shape when the hooking portion 59 is viewed in plan is the same shape as the hooking portion 32 of the connecting member 15 according to the first and second embodiments, but the half punching portion 36 is not formed. The wall portion 59 is continuous in the circumferential direction.
The connecting member 58 and the first joining flat part 13 are fixed by inserting the protrusion 62 formed at the base end of the connecting member 58 through the attachment hole 28 and caulking the tip of the inserted protrusion 62. can do.
The connecting member 58 can be formed, for example, by forging using a progressive die.
With this configuration, the four rivets 38 can be omitted, and manufacturing can be performed easily. Moreover, since the half-punching process is not performed, the arrangement position and the degree of freedom of the engaging portion 59 formed on the enlarged diameter head 60 are increased, and the strength of the engaging portion 59 can be increased.
[0023]
Next, the female thread portion 63 according to the modification will be described.
As shown in FIG. 8, the female screw portion 63 is provided on a nut member 64 that is fixed to an insertion hole portion 65 formed through the side wall portion 66 of the fixed piece 16 so as to be aligned in the axial center position.
The nut member 64 can be fixed by welding, for example. A plurality of nut members 64 can also be provided.
Since the nut member 64 is provided, the female screw portion 63 can be formed longer than the case where the female screw portion is directly formed on the side wall portion 66, the holding strength of the male screw member 29 is improved, and the performance of the apparatus is improved. Can do.
[0024]
Next, an internal thread portion 67 according to another modification will be described.
As shown in FIG. 9, the internal thread portion 67 is formed inside a punched hole 69 with a cylindrical burr portion 70 that is formed in advance through a predetermined position of the side wall portion 68 of the fixed piece 16.
The burr 70 is formed by a method generally called burring, in which a hole is drilled and a cylindrical part is formed around the hole.
Since the internal thread portion 67 is formed inside the burr portion 70, the length of the internal thread portion 67 can be increased without increasing the number of members.
The burr 70 can be formed outside or inside the side wall 68.
[0025]
As mentioned above, although embodiment concerning this invention has been described, this invention is not limited to the said embodiment.
In the first embodiment, four rivets are used, but the number of rivets may be 3 or less, or 5 or more. When the number of rivets is 1, it is preferable to provide a detent.
In addition, a guide mark may be formed on the outer side of the fixing piece (fixing frame) of the second clamp member in accordance with the position of the engaging portion, and the position may be visually confirmed when fixed by the male screw member.
[0026]
【The invention's effect】
In the fastening device according to claims 1 and 2 , since the coupling device has a diameter-enlarged head portion that is substantially enlarged in diameter from the shaft portion and is formed with a hooking portion formed of a notch on the outer periphery. The front portion of the male screw member can be fitted into the engaging portion, and the male screw member can be fastened to prevent the occurrence of rattling and can be fixed securely.
Furthermore, since the tip of the male screw member is fitted in the engaging portion, even when torque is applied to the first and second clamp members with the male screw member slightly loosened, the circumferential play remains small. The second clamp member can be held.
In particular, since the entrance side of the hooking portion is enlarged from the back side, the tip of the male screw member can be guided to the back side of the hooking portion even when the center of the hooking portion and the axis of the male screw member are displaced, and the second clamp The operability when fixing the member to the first clamp member can be improved.
[0027]
The fastening device according to claim 2 , wherein the fixed frame is provided with a cylindrical burr portion and the female screw portion is formed inside the burr portion, so that the length of the female screw portion is longer than the thickness of the fixed frame, and the male screw member The holding strength of can be improved.
[Brief description of the drawings]
FIG. 1 is a partial front sectional view of a binding device according to a first embodiment of the present invention.
FIG. 2 is a side view of the binding device.
FIG. 3 is a plan sectional view of the binding device.
4A and 4B are a plan view and a front view of a connecting member of the binding device, respectively.
FIG. 5 is a partial front sectional view of a binding device according to a second embodiment of the present invention.
FIG. 6 is a partial front sectional view in which the fixing position of the tube clamp with respect to the beam clamp of the binding device is changed.
7A and 7B are a plan view and a front view of a connecting member according to a modification, respectively.
FIG. 8 is a front sectional view of an internal thread portion according to a modification.
FIG. 9 is a front sectional view of an internal thread portion according to another modification.
FIG. 10 is a perspective view of a binding device according to a conventional example.
[Explanation of symbols]
10: Tightening device, 11: Pipe clamp (first clamp member), 12: Pipe clamp (second clamp member), 13: First joint flat part, 14: Second joint flat part, 15: Connection Member, 16: fixed piece (fixed frame), 17, 18: support shaft, 19: rotating bolt, 20: movable piece, 21, 21a: steel pipe, 22: through hole, 23-25: side wall, 26: female screw Part, 27: fixed piece (fixed frame), 28: mounting hole, 29: male screw member, 30: nut for fastening, 31: shaft part, 32: engagement part, 33: enlarged diameter head part, 34, 35: guide part , 36: half punched part, 37: insertion hole, 38: rivet, 39: binding device, 40: beam clamp (first clamp member), 41: clamping part, 42: support part, 43: connecting part, 44: Female screw hole, 46: Fastening member, 47: Fixing pin, 48: Base metal 49: Holder (fixed frame), 50: First joining flat part, 51, 52: Stopper part, 53, 54: Positioning piece, 55: Rectangular member, 56, 57: End part, 58: Connecting member, 59: Engagement part, 60: Expanded head part, 61: Shaft part, 62: Projection part, 63: Female thread part, 64: Nut member, 65: Insertion hole part, 66: Side wall part, 67: Female thread part, 68: Side wall 69, punched hole, 70: burr

Claims (2)

The first and second joint flat portions formed on the first and second clamp members sandwiching different members are brought into contact with each other, and the first and second joint flat portions are connected by a connecting member; In the fastening device, wherein the first clamp member is a beam clamp that sandwiches a H-shaped steel, a rectangular member, or a plate material, and the second clamp member includes a tube clamp that sandwiches a tube.
The first and second joining flat portions are respectively formed on a fixed frame of the beam clamp and a fixed frame of the tube clamp,
The connecting member includes a shaft portion whose base side is fixed to the first joining flat portion, a diameter- increased head formed integrally with the front side of the shaft portion and having a diameter larger than the shaft portion , and On the outer periphery of the enlarged head, four engaging portions each having a notch with the entrance side gradually expanding from the back side are formed every 90 degrees ,
The tube clamp is rotatably attached to the shaft portion through a through-hole formed in the second joint flat portion, and is attached to a fixed frame of the tube clamp in which the second joint flat portion is formed. Is provided with a female threaded portion facing the enlarged head and parallel to the second joint flat part, and the female threaded portion is fitted with one of the four engaging portions of the connecting member. The male screw member to be screwed from the outside ,
The base metal fixture and fastening member of the beam clamp sandwich the H-shaped steel, rectangular member or plate material,
The fixed frame of the beam clamp is U-shaped and has the first joint flat part in the center part, and the base metal fitting is rotatably attached to both sides thereof via fixing pins. It has a positioning piece that comes into contact with a section steel, a rectangular member or a plate,
The fastening device according to claim 1, wherein stoppers for stopping the base metal of the beam clamp at a 90-degree rotation position are formed on both front and rear sides of the first joint flat portion. 2. The binding device according to claim 1 , wherein the female screw portion is formed in a punched hole with a burr portion formed in advance at a predetermined position of the fixing frame of the tube clamp.

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