JP4894022B2 - Member connection device - Google Patents

Description

  The present invention relates to a member connecting device that can be used when assembling lightweight framework structures such as various racks, carriages, and support stands using a rod-like member such as a pipe member.

As a member connecting device utilized for the above-mentioned applications, various devices for connecting round pipe materials or square pipe materials having a regular quadrangular prismatic outer surface are known as well as patent documents. However, the present applicant has previously proposed a new member connecting device that can solve the problems in these conventionally known member connecting devices. As described in Non-Patent Document 1, this new member connecting apparatus proposed by the present applicant uses a rod-like member having a regular octagonal or regular hexagonal prismatic outer surface. That is, this member connecting device includes a first clamping means for clamping a first member having a regular octagonal or hexagonal prismatic outer surface, and a second clamping for clamping a second member connected to the first member. And the first clamping means includes a pair of clamping members and a fastening bolt nut for fastening the pair of clamping members to each other, and the pair of clamping members includes the fastening bolt nut. A clamping part that clamps the first member at a position away from the position is provided.
Japanese Patent Application No. 2007-278391

  The member connecting device proposed by Non-Patent Document 1 will be described by taking as an example the case where the first member is a pipe member having a regular octagonal prismatic outer surface, as shown in FIG. The clamping parts 5 of the pair of clamping members 2A and 2B constituting the means are provided with a central clamping plate part 8a parallel to each other perpendicular to the axial direction 3a of the fastening bolt nut and both sides of the central clamping plate part 8a. C-shaped sandwiching plate portions 8b and 8c that are connected to each other, and parallel side plate portions 11 that are connected to both sides of both of the C-shaped sandwiching plate portions 8b and 8c and that are perpendicular to the central sandwiching plate portion 8a. Thus, in this member connecting apparatus, the first member P1 is sandwiched between the sandwiching portions 5 with the prismatic outer surface and the sandwiching plate portions 8a to 8c facing each other substantially in parallel. When the clamping portions 5 are fastened to each other in the axial direction 3a with fastening bolts and nuts, as shown in FIG. 9A, the central clamping plate portion 8a of each clamping portion 5 is in pressure contact with the facing outer surface on the first member P1 side. If the front-side sandwiching plate portions 8b, 8c of each sandwiching portion 5 are configured so as to be in surface contact with the facing outer surface on the first member P1 side with an appropriate pressure, the first member is most powerful and stable. P1 can be connected to the first clamping means. When such a configuration is adopted, the fastening when the both clamping parts 5 are fastened to each other in the axial direction 3a with fastening bolts and nuts. If the force is too strong, as shown in FIG. In this process, the C-shaped sandwiching plate portions 8b and 8c are in contact with the outer shoulder surfaces of the first member P1 side facing the central sandwiching plate portion 8a. It is pushed outward. As a result, the first member P1 and the first clamping means are connected in a state where only the central clamping plate portion 8a of each clamping portion 5 is in pressure contact with the outer surface on the first member P1 side, and the first member P1 is connected. The first member P1 may be deformed when the pipe member is made of a thin plate. Even if such a situation does not occur, the coupling force between the first member P1 and the first clamping means is reduced. However, it is conceivable that the connected state becomes unstable.

  The object of the present invention is to provide a member mounting structure for a rod-shaped member that can solve the conventional problems as described above. When indicated by reference numerals, a first clamping means 2 for clamping a first member P1 having a regular octagonal or regular hexagonal prismatic outer surface, and a second member P2 connected to the first member P1 are shown. A second clamping means 3 for clamping is provided continuously. The first clamping means 2 includes a pair of clamping members 4A and 4B, a fastening bolt nut 5 for fastening the pair of clamping members 4A and 4B to each other, and a fixture. 6A and 6B, and the pair of clamping members 4A and 4B is provided with a clamping part 10 that clamps the first member P1 at a position away from the position of the fastening bolt nut 5. Is in the axial direction of the fastening bolt nut 5. A central sandwiching plate portion 10a that is perpendicular to each other, a C-shaped sandwiching plate portion 10b that is continuous with both sides of the central sandwiching plate portion 10a, and a direction that is perpendicular to the central sandwiching plate portion 10a. Parallel side plate portion 10c is provided, and the fixtures 6A and 6B include the first member P1 between the holding portions 10 of the pair of holding members 4A and 4B, the prismatic outer surface and the holding plate portions 10a and 10b. Between the parallel side plate portions 10c adjacent to each other between the sandwiching portions 10 on the outer surface of the first member P1 parallel to the axial direction of the fastening bolt nut 5. It is attached at a passing position, and is configured to prevent the parallel side plate portions 10c of the both clamping portions 10 from spreading outward by the heads 6a, 6b of the fixtures 6A, 6B.

  When carrying out the present invention, as described in claim 2, a side 10d of the parallel side plate portion 10c in the sandwiching portion 10 of the pair of sandwiching members 4A and 4B is provided with the fixtures 6A and 6B. A cut recess 11 into which the shaft portion is fitted can be provided.

  According to the member connecting device according to the first aspect of the present invention, the first member having the regular octagonal or regular hexagonal prism-shaped outer surface and the arbitrary second member are connected by the first clamping means. By holding and fixing one member and holding and fixing the second member by the second holding means, they can be connected to each other. Thus, when the first member having a regular octagonal or regular hexagonal prismatic outer surface is sandwiched and fixed by the first sandwiching means, the first sandwiching part of the pair of sandwiching members in the first sandwiching means has a When the pair of clamping members are fastened to each other by fastening bolts and nuts in a state where the one member is clamped so that the prismatic outer surface and the clamping plate portions of the both clamping portions face each other substantially in parallel, The first member with which the central clamping plate part of each clamping part faces even if it is tightened further beyond the stage where the C-shaped clamping plate part of the clamping part comes into surface contact with the outer surface facing the first member with moderate pressure. Each clamping part (C-shaped clamping plate part) is pushed outward in the process of reaching the outer surface on the side, and the head of the fixture attached to the first member and each clamping part are adjacent to each other This can be prevented by engagement with the parallel side plate portion.

  In other words, the pair of clamping members are excessively tightened by the fastening bolts and nuts so as to be in pressure contact with the outer surface on the first member side facing the central clamping plate portion of each clamping portion. Since it can be prevented beforehand by stretching against the fixture, it is easy to perform moderate tightening operations until the C-shaped clamping plate portion of each clamping portion comes into surface contact with the outer surface facing the first member with moderate pressure. It can be done reliably and reliably. Therefore, even if the first member is a pipe material composed of a thin plate, it is possible to prevent the first member from being deformed due to overtightening of the fastening bolts and nuts. Further, the clamped state in which the C-shaped clamping plate portion of each clamping portion is in surface contact with the outer surface facing the first member with an appropriate pressure, that is, the first member is fitted to each clamping portion in a wedge manner. Therefore, it is possible to reliably obtain a stable and strong fastening state that is sandwiched from both sides in a surface contact state, so that the first member can be securely clamped by the first clamping means.

  According to the configuration of the second aspect, in the state where the first clamping means is clamped and fixed to the first member as described above, the first member and the pair of clamping members of the first clamping means are the first member. The relative movement in the axial direction is prevented by the engagement between the shaft portion of the fixture attached to the first member and the notch recesses on the sides of the parallel side plate portion in the sandwiching portion of the pair of sandwiching members. In other words, even if tightening of the fastening bolt and nut of the first clamping means is somewhat weak or even if a large external force acts in the direction of pulling out the first member from the first clamping means, the first member and the first clamping means However, it is possible to surely eliminate the possibility of inconvenience that the first member is displaced in the axial direction or the first member comes out of the first clamping means.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1-7 shows 1st embodiment of this invention, Comprising: The member connection apparatus 1 in this 1st embodiment is with respect to the rod-shaped 1st member P1 and the front-end | tip of this rod-shaped 1st member P1. A rod-shaped second member P2 arranged in a T-shape in a right angle direction is connected to the rod-shaped second member P2 and is composed of a first clamping means 2 and a second clamping means 3 that are connected to each other. The first clamping means 2 includes a pair of clamping members 4A and 4B for clamping and fixing the rod-shaped first member P1, one fastening bolt nut 5 and two fixing tools 6A and 6B. The means 3 includes a pair of clamping members 7A and 7B that clamp and fix the rod-like second member P2. The pair of clamping members 7A and 7B of the second clamping means 3 are integrally connected from the pair of clamping members 4A and 4B of the first clamping means 2, and fasten the pair of clamping members 7A and 7B to each other. The bolt nut is configured so that the fastening bolt nut 5 of the first clamping means 2 is also used. The rod-shaped first member P1 and the rod-shaped second member P2 connected by the member connecting device 1 are metal pipe members having the same cross-sectional size and a regular octagonal cross-sectional shape.

  The pair of clamping members 4A and 4B of the first clamping means 2 are symmetrical to each other, and each has a base portion provided with a bolt insertion hole 8 (see FIGS. 4, 6, and 7B) through which the fastening bolt nut 5 passes. 9 and a clamping part 10 extending from the base part 9. Each clamping portion 10 has a central clamping plate portion 10a perpendicular to the axial direction of the fastening bolt nut 5 inserted through the bolt insertion hole 8, and a C-shaped clamping device connected to both sides of the central clamping plate portion 10a. A parallel side plate portion 10c is provided which is connected to both sides of the plate portion 10b and both of the C-shaped holding plate portions 10b and is perpendicular to the central holding plate portion 10a. These plate portions 10a to 10c of each clamping portion 10 extend linearly in a direction perpendicular to the axial direction of the fastening bolt nut 5 inserted through the bolt insertion hole 8, and are shown in FIGS. As shown, notched recesses 11 are formed on both sides of each clamping part 10 parallel to the length direction of the clamping members 4A and 4B of each clamping part 10, that is, on the side 10d of both parallel side plate parts 10c. Has been.

  The pair of sandwiching members 7A and 4B of the second sandwiching means 3 are symmetrical to each other, and each includes a sandwiching portion 12 provided continuously from the base 9 of the pair of sandwiching members 4A and 4B of the first sandwiching means 2. Yes. Each clamping part 12 has a pair of clamping members 4A, 4B of the first clamping means 2 at a right angle to the axial direction of the fastening bolt nut 5 inserted through the bolt insertion hole 8 of the first clamping means 2. A central clamping plate portion 12a that is perpendicular to the length direction, a C-shaped clamping plate portion 12b that is connected to both sides of the central clamping plate portion 12a, and a first clamping means 2 out of both C-shaped clamping plate portions 12b. The outer plate portion 12c is connected to the holding plate portion 12b on the side away from the base portion 9 of the pair of holding members 4A and 4B and is perpendicular to the central holding plate portion 12a. As shown in FIG. 3, the dovetail recess 13 a and the dovetail shape are formed on the outer plate portions 12 c of both the sandwiching portions 12 so as to be engaged with each other when the sandwiching portions 12 are stacked face to face. An inverted trapezoidal protrusion 13b that fits exactly into the recess 13a is juxtaposed.

  The member connecting device 1 having the above-described configuration includes the holding member 14A that integrally forms the holding member 4A of the first holding means 2 and the holding member 7A of the second holding means 3, the holding member 4B of the first holding means 2, and the second holding member 4A. The clamping member 14B and the clamping member 14B of the clamping means 3 are integrally formed of a clamping body 14B, one fastening bolt nut 5 and two fixing tools 6A and 6B. Thus, as is apparent with reference to the respective drawings, the holding bodies 14A and 14B are rectangular in plan view, and accordingly, in the length direction of the holding members 4A and 4B of the first holding means 2 On the other hand, the lengths of the clamping members 7A and 7B of the second clamping means 3 at right angles are equal to the widths of the clamping members 4A and 4B of the first clamping means 2. Further, the base 9 of the clamping members 4A and 4B of the first clamping means 2 has the same width as the clamping part 10, and the parallel side plate part 10c of the clamping part 10 extends to the base 9 side so as to be on both sides of the base 9 A plate portion is formed, and an inner side 12d parallel to the outer plate portion 12c in the clamping portion 12 of the clamping members 7A and 7B of the second clamping means 3 is formed. Furthermore, the base portion 9 is one stage higher than the central clamping plate portions 10a and 12a of the clamping portions 10 and 12 of the clamping members 4A and 4B of the first clamping means 2 and the clamping members 4A and 4B of the second clamping means 3 in a side view. In addition to being formed to be lower, a concave groove portion 15 having the bolt insertion hole 8 that is one step lower is formed at the center position in the width direction. Accordingly, a step portion 10e for positioning the tip of the rod-shaped first member P1 inserted into the clamping portion 10 is formed at the inner end of the central clamping plate portion 10a in the clamping portion 10 of the first clamping means 2. Become.

  The fastening bolt nut 5 includes a bolt 5b having a head 5a that can be fitted and rotated in the concave groove portion 15 of the base 9 in the pair of clamping members 4A and 4B of the first clamping means 2, and the concave groove portion 15 And a hexagon nut 5c that is relatively non-rotatably fitted. The bolt insertion hole 8 of the base portion 9 of the clamping member 4A in a state where the hexagon nut 5c is fitted in the concave groove portion 15 of the base portion 9 of the clamping member 4B. The bolt 5b is inserted into the bolt insertion hole 8 of the base portion 9 of the clamping member 4B from above, and the bolt 5b is screwed into the hexagon nut 5c fitted in the concave groove portion 15 of the base portion 9 of the clamping member 4B. 14A and 14B can be connected and integrated with each other.

  An example of a method of using the rod-shaped first member P1 and the rod-shaped second member P2 in a T-shape will be described. The pair of clamping members 7A and 7B in the second clamping means 3 are connected to the outer plate of the clamping portion 12. In a state where the dovetail recess 13a and the inverted trapezoidal protrusion 13b of the portion 12c are engaged with each other as shown in FIG. 3, between the sandwiching portions 12 of the pair of sandwiching members 7A and 7B of the second sandwiching means 3 Thus, the rod-shaped second member P2 is clamped. At this time, each center clamping plate part 12a and C-shaped clamping plate part 12b of the said clamping part 12 are faced substantially parallel to each outer side surface in the rod-shaped 2nd member P2. In this state, the pair of clamping members 4A and 4B of the second clamping means 3 are connected at the base 9 by the fastening bolts and nuts 5 as described above. At this time, the fastening bolt nut 5 is lightly tightened to such a degree that the pair of clamping members 4A and 4B of the first clamping means 2 are somewhat loose in the perspective direction.

  Next, the front end portion of the rod-shaped first member P1 is interposed between the sandwiching portions 10 of the pair of sandwiching members 4A and 4B of the first sandwiching means 2, and the central sandwiching plate portion 10a and the C-shaped sandwiching plate portion 10b of the sandwiching portion 10 are used. The rod-shaped first member P <b> 1 is inserted so as to face each outer surface substantially parallel to the rod-shaped first member P <b> 1, and its tip is brought into contact with the stepped portion 10 e between the sandwiching portion 10 and the base portion 9. At this time, the parallel side plate part 10c of the clamping part 10 in the pair of clamping members 4A and 4B of the first clamping means 2 is in a state in which a gap is formed between the side edges 10d in parallel with the axial direction of the rod-shaped first member P1. Since the notch recesses 11 formed on the side sides 10d of the parallel side plate portions 10c adjacent to each other are adjacent to each other, if necessary, the rod-shaped first member is provided between the notch recesses 11 adjacent to each other. A lower hole 6b (see FIG. 5) of a tapping screw used as the fixing tool 6A, 6B is drilled on each parallel outer surface of P1, and the fixing tool 6A, 6B is used by using the lower hole 6b. Between the notch recesses 11 adjacent to each other, screws are attached to the respective parallel outer surfaces of the rod-shaped first member P1, and the heads 6a, 6b of the fixtures 6A, 6B are parallel to each other of the holding parts 10 adjacent to each other. Put on the plate portion 10c. In this state, the fastening bolt nut 5 is tightened to bring the pair of clamping members 4A and 4B of the first clamping means 2 closer to each other, and the rod-shaped first member P1 is clamped and fixed between the clamping parts 10. At this time, the pair of clamping members 7A and 7B of the second clamping means 3 simultaneously approach each other, and the clamping part 12 clamps and fixes the rod-shaped second member P2. If a gap is generated between the heads 6a and 6b of the fixtures 6A and 6B and the parallel side plate portion 10c of the clamping part 10 by the final tightening operation of the fastening bolt nut 5, the gap The fixtures 6A and 6B are screwed so as to eliminate the above.

  As a result of the above operation, the rod-shaped first member P1 clamped and fixed by the first clamping means 2 and the rod-shaped second member P2 clamped and fixed by the second clamping means 3 are arranged in a rod-shaped first outside the tip of the rod-shaped first member P1. The two members P2 are connected to each other in a T-shape that is positioned at a right angle. The sandwiching portion 10 and the rod-shaped first member P1 of the pair of sandwiching members 4A and 4B of the first sandwiching means 2 are shown in FIGS. As shown in FIG. 9A, the C-shaped clamping plate 10b of each clamping unit 10 is in pressure contact with each outer surface on the side of the rod-shaped first member P1 where the C-shaped clamping plate 10b faces approximately in parallel. The central clamping plate portion 10a of each clamping portion 10 is in a state where it faces a little gap without contacting the outer surface on the rod-like first member P1 side where the central clamping plate portion 10a faces almost in parallel. It is in. In other words, the width of the central clamping plate portion 10a of the clamping portion 10 and the C-shaped clamping plate portion so that the rod-shaped first member P1 can be fastened between the clamping portions 10 of the pair of clamping members 4A and 4B in such a state. An inclination angle of 10b is set.

  In addition, the clamping part 12 in the pair of clamping members 7A and 7B of the second clamping means 3 is also formed in the same manner as the clamping part 10 in the pair of clamping members 4A and 4B of the first clamping means 2, and is a rod-shaped first member. As shown in FIG. 4, the rod-shaped second member P2 having the same shape and the same size as P1 is clamped and fixed by the second clamping means 3 under the same conditions as the rod-shaped first member P1 clamped and fixed by the first clamping means 2. It will be.

  If the fastening bolt nut 5 is tightened too much by mistake, the central clamping plate portion 10a of the clamping portion 10 faces the bar-shaped first member P1 side where the central clamping plate portion 10a faces almost in parallel as shown in FIG. 9B. When the two clamping parts 10 come close to each other so as to abut against the outer side surface, the C-shaped clamping plate part 10b is outside on both shoulders of the outer side surface on the first member P1 side facing the central clamping plate part 10a. Although it is expected that the holding portion 10 is deformed so as to be opened, deformation on both sides of the holding portion 10, i.e., the parallel side plate portion 10 c is separated from the rod-shaped first member P <b> 1. This is prevented by the heads 6a and 6b of the fixtures 6A and 6B. In other words, as shown in FIG. 9B, the fastening bolts are such that the central clamping plate portion 10 a of the clamping portion 10 comes into contact with the outer surface on the side of the rod-shaped first member P <b> 1 that the central clamping plate portion 10 a faces almost in parallel. Overtightening the nut 5 is prevented beforehand by the tension of the clamping part 10 with respect to the fixtures 6A and 6B.

  Further, the relative movement in the axial direction between the sandwiching portion 10 and the rod-shaped first member P1 in the pair of sandwiching members 4A and 4B of the first sandwiching means 2 is performed by the fixtures 6A and 6B attached to the rod-shaped first member P1 side. Since it is blocked by the engagement with the notch recess 11 on the holding part 10 side, the stick-like first member P1 is held against the frictional force between the holding part 10 and the stick-like first member P1. Even if a large external force acts in the direction of pulling out from the gap, there arises a disadvantage that the rod-shaped first member P1 is displaced in the axial direction with respect to the clamping portion 10 or the rod-shaped first member P1 is pulled out from the clamping portion 10. Absent.

  In order to attach the fixing tools 6A and 6B using tapping screws to the rod-shaped first member P1, when the lower hole 6b is first drilled in the rod-shaped first member P1, the position of the lower hole 6b is a rod-like shape. When the first member P1 is inserted into the sandwiching portion 10 of the pair of sandwiching members 4A and 4B of the first sandwiching means 2 to a predetermined depth, it is necessary to match the positions of the notch recesses 11 on both sides of the sandwiching portion 10 However, if the above-described effect due to the engagement between the fixtures 6A and 6B and the notch recess 11 on the clamping part 10 side is to be abandoned, as shown in FIG. Between the both sides of the holding part 10, that is, between the side parts 10d of the parallel side plate part 10c, it is wider than the diameter of the shaft part of the fixtures 6A, 6B, but narrower than the diameter of the heads 6a, 6b of the fixtures 6A, 6B. What is necessary is just to comprise so that a clearance can be ensured. In this case, it is possible to provide a lower hole 6b for attaching the fixtures 6A and 6B to any position between the both sides of the both sandwiching portions 10, that is, between the side sides 10d of the parallel side plate portion 10c. The work for providing 6b becomes easy. Of course, a screw hole may be provided instead of the lower hole 6b, and ordinary screws may be used as the fixtures 6A and 6B.

  The member connecting device according to the present invention includes a first holding means for holding a first member having a regular octagonal or hexagonal prismatic outer surface, and a second holding for holding a second member connected to the first member. As long as the means is connected, the member connecting device 1 shown in the above embodiment, that is, the member connecting device 1 that connects the rod-shaped first member P1 and the rod-shaped second member P2 in a T shape is limited. It is not something. For example, the present invention can be applied to various member coupling devices as described in Non-Patent Document 1. Further, a first clamping means for clamping a first member having a regular octagonal or regular hexagonal prismatic outer surface and a second clamping means for clamping a second member connected to the first member are connected. The present invention relates to a configuration of first clamping means for clamping a first member having a regular octagonal or regular hexagonal prismatic outer surface. The configuration of the second clamping means for clamping the second member may be anything. Of course, the first clamping means and the second clamping means do not need to be integrally connected, and the first clamping means and the second clamping means may be connected so as to be relatively swingable.

  When the rod-shaped first member clamped and fixed by the first clamping means 2 in the member coupling device of the present invention is a rod-shaped first member P3 having a regular hexagonal prismatic outer surface as shown in FIG. As shown in FIG. 10A, an intermediate position between the central clamping plate portion 10a and the C-shaped clamping plate portions 10b on both sides of the clamping portion 10 in the pair of clamping members 4A and 4B of the means 2, and both C-shaped clamping plates The intermediate inclined plate portions 10f and 10g are added to the intermediate position between the portion 10b and the parallel side plate portion 10c, and the plate portions facing substantially parallel to all the outer surfaces of the rod-shaped first member P3 are each sandwiched portion 10. 10B, as shown in FIG. 10B, the width in the circumferential direction of the central clamping plate portion 10a and the C-shaped clamping plate portions 10b on both sides thereof is widened, and the intermediate inclined plate portions 10f and 10g are omitted. Also good.

Fig. A is a front view showing an embodiment of the present invention, Fig. B is a bottom view of the same part cut out, and Fig. C is a sectional view taken along line XX of Fig. A. FIG. 1B is an enlarged left side view of FIG. 1A. FIG. 1B is an enlarged right side view of FIG. 1A. It is an enlarged vertical front view of FIG. 1A. FIG. 1B is an exploded front view of FIG. 1A. It is a top view which shows the clamping body of one side. 6A is a cross-sectional view taken along line YY in FIG. 6, and FIG. It is a partially notched front view which shows a modification. Fig. A is an end view for explaining a normal fastening state in the first clamping means, and Fig. B is an end view for explaining an abnormal fastening state in the first clamping means. FIGS. A and B are end views for explaining another modified example of the first clamping means.

Explanation of symbols

P1 to P5 Regular octagonal rod-shaped member P6 Round pipe material 1 Member coupling device 2 First clamping means 3 Second clamping means 4A, 4B First clamping means clamping member 5 Fastening bolt nut 6A, 6B Fixing tool 7A 7B Clamping member 8 of second clamping means Bolt insertion hole 9 Base 10, 12 Clamping portion 10a, 12a Central clamping plate portion 10b, 12b C-shaped clamping plate portion 10c Parallel side plate portion 10e Step portion 10f, 10g Intermediate inclined plate portion 11 Notch recess 12c Outer plate portion 13a Dovetail recess 13b Reverse trapezoidal protrusions 14A and 14B Clamping body 15 Notch recess P1 and P3 Rod-shaped first member P2 Rod-shaped second member

Claims (2)

  A first clamping means for clamping a first member having a regular octagonal or regular hexagonal prismatic outer surface and a second clamping means for clamping a second member connected to the first member are connected in series. The one clamping means includes a pair of clamping members, a fastening bolt nut for fastening the pair of clamping members to each other, and a fixture, and the pair of clamping members are separated from the position of the fastening bolt nut. A clamping portion is provided for clamping the first member at a position, and each clamping portion is connected to a central clamping plate portion perpendicular to the axial direction of the fastening bolt nut and both sides of the central clamping plate portion. A C-shaped sandwiching plate portion and a parallel-side plate portion connected to both the C-shaped sandwiching plate portions and perpendicular to the central sandwiching plate portion are provided, and the fixture is a first member between the sandwiching portions of the pair of sandwiching members. The prismatic outer surface and each sandwiching plate portion face each other substantially in parallel. When being clamped in a state, it is attached to both outer side surfaces of the first member parallel to the axial direction of the fastening bolt and nut at a position passing between the parallel side plate portions adjacent to each other of the clamping portions. A member coupling device that prevents the parallel side plate portions of both sandwiching portions from spreading outward by a head portion.   The member coupling device according to claim 1, wherein a cut-out recess into which a shaft portion of the fixture is fitted is provided on each side of the parallel side plate portion in the holding portion of the pair of holding members.

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