Mounting bracket for hollow structures

Abstract

To provide a fitting for a hollow structure that can be easily attached to and detached from the hollow structure and can be suitably used. [Solution] The mounting bracket 100 for hollow structures can be switched to a position where the locking pieces 20 are aligned with the axial direction of the shaft 10 and can be inserted through the through-hole H in the hollow wall K by arranging the rotation restricting section 15 on the upper surface of the shaft 10 and changing the orientation of the shaft 10 so that the support shaft 30 is approximately horizontal, and can also be switched to a position where the locking pieces 20 intersect with the axial direction of the shaft 10 and cannot be inserted through the through-hole H in the hollow wall K by arranging the rotation restricting section 15 on the lower surface of the shaft 10 and changing the orientation of the shaft 10 so that the support shaft 30 is approximately horizontal. Such a mounting bracket 100 for hollow structures can be easily attached to and detached from the hollow wall K, making it suitable for use.

Description

[Technical Field]

[0001] This invention relates to a mounting bracket for hollow structures, which is used to attach various items to the front side of a hollow structure such as a hollow wall, where workers cannot reach the back side. [Background technology]

[0002] Conventionally, mounting fixtures for hollow structures have been known that enable a predetermined item to be attached to the front side of a hollow structure such as a hollow wall by engaging a locking piece with the back side of the hollow structure (see, for example, Patent Document 1). This mounting fixture for a hollow structure is provided with a locking piece rotatably supported on one end of a shaft portion that is sufficiently longer than the thickness of the hollow wall. The locking piece is inserted into a hole formed in the hollow wall with its longitudinal direction aligned with the shaft, and the locking piece rotates on the back side of the hollow wall so that it intersects with the shaft, thereby locking the locking piece to the back side of the hollow wall and preventing the mounting bracket for the hollow structure from slipping out of the hole in the hollow wall. In this way, it becomes possible to attach various items to the front side of the hollow wall using the hollow structure mounting fixture, which has been prevented from slipping out.

[0003] Furthermore, when removing this mounting bracket for a hollow structure from a hollow wall, the locking piece on the back side of the hollow wall is rotated using a specified removal tool, and the longitudinal direction of the locking piece is aligned with the axis, making it possible to pull the mounting bracket for a hollow structure out of the hole in the hollow wall. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-267427 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of the mounting bracket for a hollow structure described in Patent Document 1, the mounting bracket for a hollow structure cannot be removed from the hollow wall without using a specified removal tool, which can make the removal process complicated. Furthermore, the locking piece of this mounting bracket for hollow structures is supported at a point offset from its longitudinal center, making it easier for the long end to rotate downward. However, when the locking piece is abutted against the back side of the hollow wall and locked, the contact area on both sides of the locking piece is different, so the force acting on both sides becomes uneven.

[0006] The object of the present invention is to provide a mounting bracket for hollow structures that can be easily attached to and detached from hollow structures and can be used suitably. [Means for solving the problem]

[0007] In order to achieve the above purpose, this invention The device comprises a shaft portion that is inserted into a through-hole formed in a hollow structure, and a locking piece that is rotatably supported on a tip side of the shaft portion by a support shaft that is perpendicular to the axial direction of the shaft portion, A mounting fixture for a hollow structure, configured such that when the longitudinal direction of the locking piece is oriented along the axial direction of the shaft portion, the locking piece is in a position where it can be inserted into the through hole together with the shaft portion, and when the longitudinal direction of the locking piece is oriented intersecting the axial direction of the shaft portion, the locking piece is in a position where it cannot be inserted into the through hole, The support shaft is disposed at the center of the locking piece in the longitudinal direction, A notch is provided on one edge of the locking piece along the longitudinal direction at a position shifted from the center in the longitudinal direction toward one end, The shaft portion is provided with a rotation restricting portion that restricts the rotation of the locking piece by engaging the locking piece with the longitudinal direction of the locking piece aligned with the axial direction of the shaft portion and inserting it into the notch.

[0008] The locking piece of the mounting bracket for hollow structures configured in this manner is lighter in weight at the one end where the notch is provided than at the other end, and the locking piece, which is rotatably supported by a central support shaft in the longitudinal direction, is more likely to rotate in the downward direction at the other end. For example, if the locking piece is inserted into the through hole of the hollow structure together with the shaft with the longitudinal direction of the locking piece aligned with the axial direction of the shaft and then rotated so that the other end of the locking piece is lower than the shaft, the locking piece and the shaft will form an approximately T-shape, and the locking piece, which is in a position intersecting the axial direction of the shaft, will be unable to pass through the through hole of the hollow structure.Therefore, the locking piece can be brought into contact with the inner wall surface of the hollow structure and locked in place, making it possible to attach the mounting bracket for hollow structures to the hollow structure. Furthermore, when the mounting bracket for hollow structures, in which the locking piece and shank form a roughly T-shape, is rotated about the shank so that the other end of the locking piece is raised above the shank, the other end of the locking piece rotates downward. The rotation of the locking piece is restricted by the rotation restricting portion, so that the locking piece and shank form a roughly I-shape, and the locking piece, oriented along the axial direction of the shank, can be inserted into the through-hole of the hollow structure, making it possible to remove the mounting bracket for hollow structures from the hollow structure by pulling the locking piece out of the through-hole. In this way, the mounting bracket for hollow structures can be switched between a configuration in which the locking piece and the shaft form an approximately T-shape, and a configuration in which the locking piece and the shaft form an approximately I-shape, so that once the mounting bracket for hollow structures has been attached to a hollow structure, it can be removed. Such a mounting fixture for hollow structures can be easily attached to and detached from hollow structures, and can be used favorably.

[0009] Furthermore, the locking piece of this mounting bracket for hollow structures is supported by a support shaft located in the center of the longitudinal direction of the locking piece, so when the locking piece, which is in a position intersecting the axial direction of the shaft, is abutted against the inner wall surface of the hollow structure and locked, the contact area on both sides of the locking piece becomes approximately the same, and the force acting on both sides of the locking piece becomes approximately equal. In this way, when the locking piece is abutted against the inner wall surface of the hollow structure and locked, the force acting on both sides of the locking piece is approximately equal, so the hollow structure mounting bracket can be fixed to the hollow structure in a balanced manner, allowing the hollow structure mounting bracket to be used preferably.

[0010] Also, preferably, the rotation restricting portion is provided at a position where the support shaft is sandwiched between the rotation restricting portion and the tip end of the shaft portion, The notch is arranged so as to overlap the shaft when the locking piece is oriented with its longitudinal direction aligned with the axial direction of the shaft.

[0011] This allows the mounting bracket for hollow structures to be suitably switched to a configuration in which the locking piece and the shaft portion form an approximately I-shape, so that the locking piece, aligned in the axial direction of the shaft portion, can be smoothly inserted into the through hole.

[0012] Also, preferably, The locking piece is designed so that the center of gravity is on the other end side, which is disposed on either side of the support shaft, with the other end side being provided with the notch.

[0013] Since the center of gravity of the locking piece is on the other end opposite to the end where the notch is provided, the locking piece rotates around the support shaft as the center of rotation, with the other end of the locking piece rotating in the downward direction, allowing the locking piece and the shaft to switch between a state in which the locking piece and the shaft form an approximately T-shape and a state in which the locking piece and the shaft form an approximately I-shape. The answer is given.

[0014] Also, preferably, The locking piece is formed in a shape such that one end where the notch is provided is tapered more than the other end across the support shaft.

[0015] If one end of the locking piece where the notch is provided is formed in a tapered shape, the weight of that one end will be much lighter than that of the other end, making it easier for the other end of the locking piece to rotate in the downward direction.

[0016] Also, preferably, By arranging the rotation regulating portion on the upper surface of the shaft portion and changing the orientation of the shaft portion so that the support shaft is approximately horizontal, the locking piece changes to a position where its longitudinal direction is aligned with the axial direction of the shaft portion, and by arranging the rotation regulating portion on the lower surface of the shaft portion and changing the orientation of the shaft portion so that the support shaft is approximately horizontal, the locking piece changes to a position where its longitudinal direction intersects with the axial direction of the shaft portion.

[0017] For example, by rotating the shaft portion 180 degrees around the axis and switching the rotation control portion between being positioned on the upper side and the lower side of the shaft portion, the locking piece can be easily switched between a position in which it is aligned with the axial direction of the shaft portion, allowing it to pass through the through hole of the hollow structure, and a position in which it is intersecting the axial direction of the shaft portion, preventing it from passing through the through hole of the hollow structure, making it suitable for use as a mounting bracket for hollow structures that is easy to attach and detach from hollow structures.

[0018] Also, preferably, The rear end of the shaft is provided with a connecting portion for connecting a predetermined article.

[0019] In this way, a predetermined item can be installed in the hollow structure via the mounting bracket for hollow structure attached to the hollow structure. [Effects of the Invention]

[0020] According to the present invention, a mounting bracket for hollow structures can be obtained that is easy to attach and detach from hollow structures and can be used preferably. [Brief explanation of the drawings]

[0021] [Figure 1] 1A and 1B are perspective views showing a mounting fixture for a hollow structure according to an embodiment of the present invention. [Figure 2] 1A is a side view showing the hollow structure mounting fixture of this embodiment, and FIG. 1B is a side view showing a partial cross section of the same. [Figure 3] FIG. 2 is a top view showing the hollow structure mounting bracket of the present embodiment. [Figure 4] FIG. 2 is a side view showing the hollow structure mounting bracket of the present embodiment. [Figure 5] FIG. 2 is a side view showing a locking piece of the hollow structure mounting bracket of the present embodiment. [Figure 6] 1A and 1B are explanatory diagrams showing how a mounting bracket for a hollow structure is attached to a hollow wall. [Figure 7] FIG. 10 is an explanatory diagram showing how the hollow structure mounting bracket is attached to a hollow wall. [Figure 8] FIG. 10 is an explanatory diagram showing how the hollow structure mounting bracket is attached to a hollow wall. [Figure 9] 10(a), 10(b), and 10(c) are explanatory views showing how to remove the hollow structure mounting bracket from the hollow wall. [Figure 10] 1A is a side view showing a modified example of the hollow structure mounting fixture, and FIG. 1B is a side view showing a partial cross section of the modified example. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following describes in detail the embodiments of the mounting bracket for hollow structures according to the present invention with reference to the drawings. However, although the embodiments described below are subject to various technical limitations that are preferable for implementing the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

[0023] The mounting bracket 100 for a hollow structure of this embodiment comprises, for example, a shaft portion 10 that is inserted into a through hole formed in a hollow structure such as a hollow wall, and a locking piece 20 that is rotatably supported at the tip side of the shaft portion 10 by a support shaft 30 that is perpendicular to the axial direction of the shaft portion 10, as shown in Figures 1 to 4. This mounting bracket 100 for hollow structures is configured so that when the locking piece 20 is oriented with its longitudinal direction aligned with the axial direction of the shaft portion 10 (see Figures 1(a) and 2(a)), the locking piece 20 is in a position that allows it to be inserted into the through hole together with the shaft portion 10, and when the locking piece 20 is oriented with its longitudinal direction intersecting the axial direction of the shaft portion 10 (see Figures 1(b) and 4), the locking piece 20 is in a position that prevents it from being inserted into the through hole. The locking piece 20 is designed to be locked onto the back side of a hollow structure (e.g., a hollow wall) with its longitudinal direction intersecting the axial direction of the shaft portion 10, and has the function of preventing the mounting bracket for the hollow structure from slipping out of the through hole of the hollow structure.

[0024] The mounting bracket 100 for hollow structures (shaft 10, locking piece 20, etc.) is a member formed using carbon steel for machine structures such as S45C or chromium molybdenum steel such as SCM440.

[0025] The shaft 10 is a rod-shaped member having a predetermined length, and is formed to be longer than the thickness of the hollow wall to which the hollow structure mounting bracket 100 is to be attached. A pair of locking piece support portions 11, 11 formed in a bifurcated shape are provided at the tip side of the shaft portion 10, and a connection portion 12 is provided at the rear end side of the shaft portion 10 for connecting a specified item to the mounting bracket 100 for hollow structures. Further, between the locking piece support portion 11 and the connecting portion 12 on the shaft portion 10, a male thread portion 13 onto which a nut 14 is screwed is provided at a location close to the connecting portion 12. The locking piece support portion 11, the connecting portion 12, and the male screw portion 13 have different thicknesses, but the shaft portion 10 is generally cylindrical. Specifically, the pair of locking piece support portions 11, 11 side is thin, the connecting portion 12 side is thick, and the male screw portion 13 is formed to be slightly thicker than the locking piece support portion 11.

[0026] The pair of locking piece support portions 11, 11 are formed such that the tip side of the shaft portion 10 is divided into two along the axial direction, and each locking piece support portion 11 has a generally semicircular shape in cross section. The pair of locking piece support portions 11, 11 are not completely separated, and a portion of the pair of locking piece support portions 11, 11 is connected by a rotation restricting portion 15, which will be described later. A support shaft 30 extending perpendicular to the axial direction of the shaft portion 10 penetrates and spans the pair of locking piece support portions 11, 11.

[0027] The rotation restricting portion 15 is provided at a position where the support shaft 30 is sandwiched between the rotation restricting portion 15 and the tip end of the shaft portion 10 . In other words, the rotation restricting portion 15 connects the pair of locking piece support portions 11, 11 on the rear end side of the shaft portion 10 relative to the support shaft 30. The rotation restricting portion 15 is provided on the outer surface side of the shaft portion 10 and connects the pair of locking piece support portions 11, 11 on the outer surface side of the shaft portion 10. The rotation restricting portion 15 is provided to restrict the rotation of the locking piece 20 which is rotatably supported by the pair of locking piece support portions 11, 11 via a support shaft 30. Specifically, the rotation restricting portion 15 can be fitted into a notch 21 of the locking piece 20, which will be described later, to restrict the rotation of the locking piece 20.

[0028] As shown in FIG. 2(b), the connecting portion 12 is provided with a screw hole 12a that is aligned with the axial direction of the shaft portion 10. This screw hole 12a has a female thread formed therein, and a male screw provided on a specified item can be screwed into the screw hole 12a, making it possible to connect the specified item to the rear end of the mounting bracket 100 for hollow structures.

[0029] The male threaded portion 13 and the nut 14 threaded onto the male threaded portion 13 are provided for attaching the hollow structure mounting bracket 100 to the hollow structure (hollow wall K). Specifically, as will be explained later with reference to Figure 8, the mounting bracket 100 for a hollow structure can be attached to a hollow structure (hollow wall K) by sandwiching the hollow structure (hollow wall K) between the locking piece 20 and the nut 14, which are oriented so that their longitudinal direction intersects with the axial direction of the shaft portion 10. The length of the male thread portion 13 of the shaft portion 10 is designed according to the thickness of the hollow wall K to which the hollow-structure mounting bracket 100 is to be attached.

[0030] The locking piece 20 is a rectangular flat plate member, and is supported by a support shaft 30 between a pair of locking piece support portions 11, 11. The support shaft 30 that supports the locking piece 20 is disposed in the center of the locking piece 20 in the longitudinal direction. The locking piece 20 of this embodiment has a shape in which one long side edge is linear and the other long side edge is curved. A notch 21 is provided in one of the linear edges of this locking piece 20 along the longitudinal direction at a position shifted from the center in the longitudinal direction toward one end (a position spaced away from one end). Specifically, as shown in Figure 5, an axial hole 20a through which the support shaft 30 passes is provided in the longitudinal center of the locking piece 20, and the cutout portion 21 of the locking piece 20 is formed by cutting out the edge of the locking piece 20 so that the opposite side can be seen in the direction along the axial hole 20a. This notch 21 is positioned so that it overlaps with the shaft 10 when the longitudinal direction of the locking piece 20 is aligned with the axial direction of the shaft 10, and when the locking piece 20 is aligned with its longitudinal direction along the shaft 10, the rotation regulating portion 15 engages with the notch 21.

[0031] In particular, the locking piece 20 is designed so that the center of gravity is on the other end side of the locking piece 20, which is disposed across the support shaft 30 from the one end side where the notch 21 is provided. In other words, the center of gravity of the locking piece 20 is on the other end side of the locking piece 20, which is the side sandwiching the support shaft 30 from the one end side of the locking piece 20 where the notch portion 21 is provided. Since the center of gravity of the locking piece 20 is on the other end side opposite to the one end side where the notch 21 is provided, the locking piece 20 rotates in the downward direction with the support shaft 30 as the center of rotation.

[0032] Between the shaft hole 20a of the locking piece 20 and the support shaft 30, a sliding contact member (not shown) is interposed to allow the locking piece 20 to rotate smoothly. The locking piece 20 is formed so that the central portion in the longitudinal direction is the widest. The locking piece 20 is formed in a shape such that one end where the notch 21 is provided is tapered more than the other end across the support shaft 30 . The locking piece 20 formed in this shape has a notch 21 and is tapered so that one end is lighter in weight than the other end. That is, the locking piece 20 supported by the support shaft 30 rotates in a direction in which the other end side of the locking piece 20 without the notch 21 moves downward.

[0033] One end of the locking piece 20 formed in a tapered shape is narrower than the diameter of the shaft portion 10. is formed. If the locking piece 20 has such a shape, when the longitudinal direction of the locking piece 20 is aligned along the shaft portion 10, one end of the locking piece 20 overlaps with the shaft portion 10, and one end of the locking piece 20 is placed between a pair of locking piece support portions 11, 11.

[0034] Next, a procedure for attaching and detaching the hollow structure mounting bracket 100 of this embodiment to a hollow wall K serving as a hollow structure will be described.

[0035] First, a through hole H is formed in the hollow wall K for attaching the hollow structure mounting bracket 100. 6(a), the mounting bracket 100 for hollow structures, with the locking piece 20 aligned approximately parallel to the shaft portion 10, is inserted into the through-hole H formed in the hollow wall K from the locking piece 20 side. At this time, the support shaft 30 is held approximately horizontal, and the rotation restricting portion 15 is disposed on the upper surface side of the shaft portion 10. Next, as shown in Figure 6(a), the mounting bracket 100 for hollow structures inserted into the through hole H is rotated 180° around the axis and turned upside down, and as shown in Figure 6(b), the support shaft 30 is made approximately horizontal and the rotation control part 15 is placed on the underside of the shaft part 10.

[0036] Then, as shown in Figures 6(b) and 7, the locking piece 20 rotates so that one end side, which has the notch 21 and is tapered, is raised and the other end side, which does not have the notch 21, is lowered, and the locking piece 20 switches to a position in which its longitudinal direction intersects approximately perpendicularly with the axial direction of the shaft portion 10. In this way, the locking piece 20 switches to a position that prevents it from being inserted through the through-hole H, and the locking piece 20 and the shaft 10 of the hollow structure mounting fitting 100 form a roughly T-shape.

[0037] Next, as shown in FIG. 8, the hollow structure mounting fixture 100 is pulled in the direction of removal from the through-hole H, and the locking pieces 20 come into contact with the inner wall surface of the hollow wall K and are locked. Furthermore, the bolt 14 is screwed forward toward the tip end of the shaft portion 10 so that the bolt 14 is brought into close contact with the outer wall surface of the hollow wall K. In this way, the hollow structure mounting bracket 100 can be attached to the hollow wall K with the hollow wall K sandwiched between the locking piece 20 and the bolt 14, and the hollow structure mounting bracket 100 can be fixed to the hollow wall K. In particular, the locking piece 20 of the mounting bracket 100 for hollow structures in this embodiment is supported by the support shaft 30 at its longitudinal center, so when the locking piece 20 is abutted against the inner wall surface of the hollow wall K, the contact area on both sides of the locking piece 20 is approximately the same, and the force acting on both sides of the locking piece 20 is approximately equal, making it possible to fix the mounting bracket 100 for hollow structures to the hollow wall K in a balanced manner. By screwing a specified item to the connection portion 12 of the mounting bracket 100 for a hollow structure fixed to the hollow wall K in this manner, the specified item can be installed on the hollow wall K via the mounting bracket 100 for a hollow structure.

[0038] When the use of a predetermined item that has been installed on the hollow wall K via the hollow structure mounting bracket 100 has been completed, the item is removed from the connecting portion 12. 9(a), the bolt 14 is threaded back toward the rear end of the shaft portion 10, and the bolt 14 is separated from the outer wall surface of the hollow wall K.

[0039] Next, as shown in Figures 9(a) and 9(b), the mounting bracket 100 for hollow structures inserted into the through-hole H is rotated 180° around the axis and turned upside down, and the rotation restriction portion 15 is placed on the upper surface side of the shaft portion 10 as shown in Figure 9(b).

[0040] 9(b) and 9(c), the locking piece 20 has the notch 21. At the same time, the engaging piece 20 rotates so that one tapered end side is raised and the other end side without the notch 21 is lowered, and the engaging piece 20 switches to a position where its longitudinal direction is aligned with the axial direction of the shaft portion 10. In this way, the locking piece 20 switches to a position that allows it to be inserted through the through-hole H, and the locking piece 20 and the shaft 10 of the hollow structure mounting fixture 100 assume a substantially I-shape. In this way, the hollow structure mounting fixture 100 with the locking pieces 20 aligned along the shaft portion 10 can be pulled out from the through-hole H in the hollow wall K and removed.

[0041] In particular, when the locking piece 20 is aligned with its longitudinal direction along the shaft portion 10, one end of the locking piece 20, which is formed in a tapered shape, fits between a pair of locking piece support portions 11, 11 and overlaps with the shaft portion 10.Therefore, when the mounting bracket 100 for hollow structures is removed from the through hole H, the end of the locking piece 20 does not get caught on the wall of the through hole H, and it can be pulled out and removed smoothly. In this way, the hollow structure mounting bracket 100 can be easily pulled out of the through-hole H in the hollow wall K and removed from the hollow wall K. The hollow structure mounting bracket 100 that has been removed from the hollow wall K and recovered can then be similarly attached to a hollow wall K at another work site and used.

[0042] As described above, in the mounting bracket 100 for hollow structures of this embodiment, the orientation of the locking piece 20 can be switched to align with the axial direction of the shaft 10 by arranging the rotation control section 15 on the upper surface of the shaft 10 and switching the orientation of the shaft 10 so that the support shaft 30 is approximately horizontal, and the orientation of the locking piece 20 can be switched to intersect with the axial direction of the shaft 10 by arranging the rotation control section 15 on the lower surface of the shaft 10 and switching the orientation of the shaft 10 so that the support shaft 30 is approximately horizontal. In other words, the mounting bracket 100 for hollow structures of this embodiment can be easily switched between a position in which the locking piece 20 is aligned in the axial direction of the shaft 10, allowing the locking piece 20 to pass through the through hole H in the hollow wall K, and a position in which the locking piece 20 intersects with the axial direction of the shaft 10, preventing the locking piece 20 from passing through the through hole H in the hollow wall K, by rotating the shaft 10 180 degrees around the axis. Such a hollow structure mounting fixture 100 can be easily attached to and detached from the hollow wall K, and can be used favorably.

[0043] The present invention is not limited to the above embodiment. For example, as shown in Figures 10(a) and 10(b), the width of the locking piece 20 of the hollow structure mounting bracket 100 may be the same dimension as the diameter of the shaft portion 10. Alternatively, the width of the locking piece 20 may be narrower than the diameter of the shaft portion 10. By doing so, when the position of the locking piece 20 is aligned with the axial direction of the shaft portion 10, the locking piece 20 overlaps the shaft portion 10 without protruding, so that the locking piece 20 can be smoothly inserted into the through hole H together with the shaft portion 10. In this case, the edge of one long side of the locking piece 20 where the notch 21 is provided is linear, and the edge of the other long side is linear and bent. Even such a hollow structure mounting fixture 100 can be easily attached to and detached from the hollow wall K, and can be used favorably.

[0044] In the above embodiment, an example of a locking piece 20 having a tapered end is shown, but the present invention is not limited to this, and the shape of the locking piece 20 is arbitrary, as long as the center of gravity of the locking piece 20 is on the other end side opposite the one end side where the cutout portion 21 is provided.

[0045] Furthermore, it goes without saying that other specific detailed structures and the like can be modified as appropriate. [Explanation of symbols]

[0046] 10 Shaft 11 Locking piece support part 12 Connection 12a screw hole 13 Male thread 14 Nut 15 Rotation restriction part 20 Locking piece 20a shaft hole 21 Notch 30 Spindle 100 Mounting bracket for hollow structures K Hollow wall (hollow structure) H through hole

Claims

1. The device comprises a shaft portion that is inserted into a through hole formed in a hollow structure, and a locking piece that is rotatably supported on a support shaft at the tip end of the shaft portion that is perpendicular to the axial direction of the shaft portion, A mounting fixture for a hollow structure, configured such that when the longitudinal direction of the locking piece is oriented along the axial direction of the shaft portion, the locking piece is in a position where it can be inserted into the through hole together with the shaft portion, and when the longitudinal direction of the locking piece is oriented intersecting the axial direction of the shaft portion, the locking piece is in a position where it cannot be inserted into the through hole, The support shaft is disposed at the center of the locking piece in the longitudinal direction, A notch is provided on one edge of the locking piece along the longitudinal direction at a position shifted from the center in the longitudinal direction toward one end, A mounting bracket for hollow structures, characterized in that the shaft portion is provided with a rotation regulating portion that engages with the notch with the longitudinal direction of the locking piece aligned with the axial direction of the shaft portion, thereby regulating the rotation of the locking piece.

2. the rotation restricting portion is provided at a position where the support shaft is sandwiched between the rotation restricting portion and the tip end of the shaft portion, The mounting bracket for a hollow structure according to claim 1, characterized in that the notch is positioned so as to overlap with the shaft portion when the locking piece is oriented with its longitudinal direction along the axial direction of the shaft portion.

3. The mounting bracket for a hollow structure according to claim 1 or 2, characterized in that the locking piece is designed so that its center of gravity is on the other end side, positioned on either side of the support shaft and on the other end side where the notch is provided.

4. A mounting bracket for a hollow structure as described in any one of claims 1 to 3, characterized in that the locking piece is formed in a shape that is tapered at one end where the notch is provided compared to the other end on which the support shaft is sandwiched.

5. A mounting bracket for a hollow structure as described in any one of claims 1 to 4, characterized in that by arranging the rotation regulating portion on the upper surface of the shaft and changing the orientation of the shaft so that the support shaft is approximately horizontal, the locking piece changes to a position in which its longitudinal direction is aligned with the axial direction of the shaft, and by arranging the rotation regulating portion on the lower surface of the shaft and changing the orientation of the shaft so that the support shaft is approximately horizontal, the locking piece changes to a position in which its longitudinal direction intersects with the axial direction of the shaft.

6. The mounting bracket for a hollow structure according to any one of claims 1 to 5, characterized in that a connecting portion for connecting a predetermined item is provided at the rear end of the shaft portion.

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