JP6637308B2 - Rotary overhang prop - Google Patents

Description

  The present disclosure relates to a rotating overhang post used to bridge a road appendage.

  Overhanging props are used to install road accessories such as vehicle detectors, traffic signage, and traffic lights. The overhanging strut has a strut installed on the side of the road, and an arm extending horizontally from the strut and extending out onto the road, and a road accessory is attached to the arm.

  When performing maintenance on road accessories attached to the arm, lane regulation is performed to secure a foothold for work. However, it may not be completed within a limited time, such as overnight, depending on the type of regulation and repair content. In addition, it is preferable to reduce the number of lanes to be regulated, rather than to perform lane regulation on all lines.

  As one effective means for solving such a problem, Patent Document 1 discloses a rotary overhanging support. In this support structure, a vertically installed column is separated into a fixed column and a rotating column, an arm for installing a road accessory is provided on the rotating column, and a flange of the fixed column and a flange of the rotating column are bolted. ing. When maintenance work is required, the arm is moved toward the side of the road by removing the bolt and rotating the rotating support, thereby retreating the road accessory from the center of the road as much as possible.

JP 2009-2052A

  However, in the support structure of Patent Literature 1, the rotating column cannot be rotated with respect to the fixed column unless the bolt and nut for fastening the flange of the fixed column and the flange of the rotary column are completely removed. At this time, there is a possibility that the bolts and nuts may fall off unexpectedly, and the working efficiency is impaired.

  The present disclosure has been made in view of such a problem, and an object of the present disclosure is to provide a rotary overhanging pillar that reduces the risk of bolts and nuts falling off and improves the ease of handling. is there.

  The present disclosure takes the following measures to achieve the above object.

That is, the rotating overhang strut of the present disclosure is:
A fixed post installed vertically,
A rotating support that is vertically mounted on the top of the fixed support and is rotatable about the axis of the fixed support;
An arm extending laterally from the rotating column,
A fixed-side flange provided on the fixed support,
A rotating flange provided on the rotating support and opposed to the fixed flange,
A bolt inserted into the bolt insertion space formed on both flanges and a nut for tightening both flanges,
One flange is a large-diameter flange that is larger in diameter than the other, and the other flange is a small-diameter flange.When viewed along the axial direction, the overlapping area where the two flanges overlap, and the two flanges overlap. There is no non-polymerized area, and
Bolt insertion spaces formed in both flanges extend from the radially inner side to the outer side so as to allow movement of the bolt from the overlapping region to the non-overlapping region.

According to this configuration, the overlapping area where the two flanges overlap is an area where the two flanges are fastened with the bolt and the nut, and the bolt interferes with the small-diameter flange in the circumferential direction, so that the rotating column is rotated when the bolt is inserted. Can not. In the non-overlapping area where the two flanges do not overlap, the bolt does not interfere with the small-diameter flange in the circumferential direction, so that the rotating column can be rotated while the bolt is inserted. The bolt insertion space formed on both flanges extends from the inside to the outside in the radial direction to allow the bolt to move from the overlapping area to the non-overlapping area, so the bolt with the nut is inserted into the insertion space. The bolt can be moved in the state in which the bolt is moved.
Therefore, there is no need to remove the nuts and bolts, and the support can be rotated simply by loosening the nuts and moving the bolts, thereby reducing the risk of the bolts and nuts falling off and improving the ease of handling. Becomes

The rotating overhang strut of the present disclosure is:
A fixed post installed vertically,
A rotating support that is vertically mounted on the top of the fixed support and is rotatable about the axis of the fixed support;
An arm extending laterally from the rotating column,
A fixed-side flange provided on the fixed support,
A rotating flange provided on the rotating support and opposed to the fixed flange,
A bolt inserted into the bolt insertion space formed on both flanges and a nut for tightening both flanges,
A bolt insertion space formed in at least one of the two flanges extends in the circumferential direction.

According to this configuration, only by loosening the nut, the rotating column can rotate with respect to the fixed column.
Therefore, it is not necessary to remove the nut and the bolt, and the support can be rotated only by loosening the nut. Therefore, the risk of the bolt and the nut falling off can be reduced, and the ease of handling can be improved.

FIG. 2 is a side view showing the rotary overhanging support according to the first embodiment of the present disclosure. The figure which shows the joint part of the rotating support | pillar and fixed support | pillar in 1st Embodiment. FIG. 4 is an explanatory diagram regarding the operation of the bolt according to the first embodiment. FIG. 6 is a diagram showing a modification of the first embodiment. FIG. 6 is a diagram showing a modification of the first embodiment. FIG. 6 is a diagram showing a modification of the first embodiment. FIG. 6 is a diagram showing a modification of the first embodiment. FIG. 6 is a diagram showing a modification of the first embodiment. FIG. 6 is a diagram showing a modification of the first embodiment. The figure which shows the joint part of the rotating support | pillar and fixed support | pillar in 2nd Embodiment. The figure which shows the rotation angle control structure of a rotating support | pillar and a fixed support | pillar.

<First embodiment>
A first embodiment of the present disclosure will be described with reference to the drawings.

  As shown in FIG. 1, the rotary overhanging support includes a fixed support 1 installed vertically, a rotary support 2 rotatable around the axis of the fixed support 1, and an arm 3 extending laterally from the rotary support 2. And

  As shown in FIG. 1, the fixed support column 1 is a column installed on a foundation such as a road surface beside a road or a fence beside an expressway, and stands upright.

  As shown in FIGS. 1 and 2, the rotating column 2 is vertically attached to the upper portion of the fixed column 1. In the present embodiment, the upper portion of the fixed support 1 has a small-diameter cylindrical portion 10, the lower portion of the rotary support 2 has a large-diameter cylindrical portion 20, and the small-diameter cylindrical portion 10 of the fixed support 1 is replaced with a large-diameter cylindrical portion of the rotary support 2. The fixed support 1 supports the rotary support 2 rotatably about an axis by being inserted into the portion 20. Of course, the vertical relationship between the small-diameter tube portion 10 and the large-diameter tube portion 20 can be interchanged. The rotatable support structure is not limited to this embodiment, and may be any structure as long as it is rotatable around an axis.

  The arm 3 projects laterally (horizontally in the embodiment) from the rotating column 2 and is provided with a mounting portion 30 for mounting a road accessory such as a vehicle detector. In the present embodiment, the attachment portion 30 is a hole formed in the rod portion forming the arm 3, but can be changed as appropriate. The arm 3 is supported by the rotating column 2 in a cantilever manner. In order to reinforce the support of the arm 3 by the rotating column 2, a tension reinforcing member 31 (stay) is provided between the arm 3 and the rotating column 2.

  As shown in FIG. 2, a fixed flange 11 provided on the fixed column 1 and a rotating flange 21 provided on the rotary column 2 are opposed to each other at a joint portion between the fixed column 1 and the rotating column 2. Bolt insertion spaces 12 and 22 for inserting bolts 40 are formed in both flanges 11 and 21. By inserting the bolt 40 into the bolt insertion spaces 12 and 22 and tightening the nut 41, the flanges 11 and 21 are fastened, and the rotating support 2 is fixed so as not to rotate. Although the flange is circular when viewed along the axial direction, the flange is not limited to this, and may be rectangular or the like.

  As schematically shown in FIG. 3, one flange 11 is a large-diameter flange having a larger diameter than the other flange 21, and the other flange 21 is a small-diameter flange, and when viewed along the axial direction, There is an overlapping area Ar1 where both flanges 11 and 21 overlap, and a non-overlapping area Ar2 where both flanges 11 and 21 do not overlap. In the present embodiment, the fixed flange 11 is a large-diameter flange, and the rotating flange 21 is a small-diameter flange. Thus, if the small-diameter flange is above and the large-diameter flange is below, the appearance from below can be improved.

  As shown in FIGS. 2 and 3, the bolt insertion spaces 12 and 22 formed in the flanges 11 and 21 are radially inward so as to allow the bolt 40 to move from the overlapping area Ar1 to the non-overlapping area Ar2. It extends from RD2 to the outside RD1. In the present embodiment, the bolt insertion space 12 of the large-diameter flange 11 terminates in the large-diameter flange, and is a long hole extending from the radial inside RD2 to the outside RD1. The bolt insertion space 22 formed in the small diameter flange 21 is a notch extending from the radial inside RD2 to the outside RD1. As described above, the bolt insertion space 12 of the large diameter flange 11 extends outside the outer diameter of the small diameter flange 21 (more specifically, at least a place where the moved bolt 40 and nut 41 do not interfere with the small diameter flange 21), In addition, since the bolt 40 terminates in the large-diameter flange, the bolt 40 can be prevented from slipping out of the large-diameter flange 11 by sliding movement.

  In the present embodiment, the entire bolt insertion spaces 12, 22 formed in the flanges 11, 21 extend along the radial direction RD. If the bolt insertion spaces 12 and 22 extend in the radial direction RD in this manner, the bolts are strong against a rotational moment, and proper flange fastening is possible.

  As shown in FIG. 1, both flanges 11 and 21 are arranged at a distance of 3.8 m or more from the road surface ro so as not to interfere with the building limit (two-dot chain line) of Article 12 of the Road Structure Ordinance. It is arranged so that it becomes 4.5 m or more from ro.

  Normally, as shown in FIG. 3, the flanges 11 and 21 are fastened by the bolts 40 and the nuts 41 in the overlapping area Ar1 where the flanges 11 and 21 overlap.

  At the time of maintenance, if the nut 41 is loosened, the bolt 40 with the nut 41 attached can be moved from the overlapping region Ar1 to the non-overlapping region Ar2. When the bolt 40 is moved to the non-overlapping area Ar2, the bolt 40 does not interfere with the small-diameter flange 21 in the circumferential direction, so that the rotating column 2 can rotate.

  Since the bolt insertion space 22 of the rotating flange 21 is notched, a spacer 42 is provided between the rotating flange 21 and the nut 41 to increase the fastening area and increase the tightening.

  Further, a bolt 43 is attached to the bolt 40 to prevent the nut 41 from coming off the bolt 40. That is, at least one of the bolt 40 and the nut 41 has a retaining structure. As a retaining structure other than the fall prevention pin 43, adopting a retaining structure described in Japanese Patent No. 3354910 can be mentioned. This structure includes a nut, and a bolt provided with an annular groove having an inner diameter smaller than the root diameter of the male screw portion at a position near the tip of the male screw portion with which the nut is screwed, and The groove width is formed to be larger than the axial dimension of the nut, and when the nut screwed and fastened to the male screw portion is rotationally moved in the loosening direction, the nut fits in the annular groove and the nut shaft The nut is prevented from falling off from the bolt due to the displacement of the shaft of the bolt and the bolt.

  Further, as shown in FIG. 2, reinforcing ribs 13 and 23 for connecting the flanges 11 and 21 and the columns are provided on both the flanges 11 and 21. The reinforcing ribs 13 and 23 extend along the radial direction RD.

  Further, in order to prevent the rotating column 2 from coming off the fixed column 1, wire fixing portions 14 and 24 are provided inside the tubes of the fixed column 1 and the rotating column 2, and the wire mounting portions 14 and 24 are provided with wires. 4 is attached. The wire 4 has some slack so as not to hinder the rotation of the rotating column 2.

As described above, the rotary overhanging strut of the present embodiment is:
A fixed column 1 installed vertically,
A rotating support 2 vertically attached to an upper portion of the fixed support 1 and rotatable around the axis of the fixed support 1;
An arm 3 extending laterally from the rotating column 2;
A fixed-side flange 11 provided on the fixed column 1,
A rotating side flange 21 provided on the rotating column 2 and facing the fixed side flange 11;
A bolt 40 inserted into the bolt insertion spaces 12, 22 formed in the flanges 11, 21 and a nut 41 for fastening the flanges 11, 21;
One flange 11 is a large-diameter flange having a larger diameter than the other flange 21, and the other flange 21 is a small-diameter flange. When viewed along the axial direction, the overlapping region Ar1 where the two flanges 11, 21 overlap with each other. And a non-polymerized region Ar2 where both flanges 11 and 21 do not overlap,
The bolt insertion spaces 12 and 22 formed in the flanges 11 and 21 extend from the radial inside RD2 to the outside RD1 so as to allow the bolt 40 to move from the overlapping area Ar1 to the non-overlapping area Ar2. .

As described above, the overlapping area Ar1 where the flanges 11 and 21 overlap with each other is an area where the flanges 11 and 21 are fastened by the bolt 40 and the nut 41, and the bolt 40 interferes with the small-diameter flange 21 in the circumferential direction. In the state in which 40 is inserted, the rotating column 2 cannot rotate. In the non-overlapping region Ar2 where the two flanges 11 and 21 do not overlap, the bolt 40 does not interfere with the small-diameter flange 21 in the circumferential direction, so that the rotating column 2 can be rotated while the bolt 40 is inserted. The bolt insertion spaces 12 and 22 formed in the flanges 11 and 21 extend from the radially inner RD2 to the outer RD1 so as to allow the bolt 40 to move from the overlapping area Ar1 to the non-overlapping area Ar2. The bolt 40 can be moved while the bolt 40 to which the nut 41 is attached is inserted through the insertion spaces 12 and 22.
Therefore, it is not necessary to remove the nut 41 and the bolt 40, and the support can be rotated only by loosening the nut 41 and moving the bolt 40. Therefore, the risk of the bolt 40 and the nut 41 falling off is reduced, and the handling is easy. Can be improved.

  In the present embodiment, the bolt insertion space 12 formed in the large-diameter flange 11 terminates in the large-diameter flange 11. According to this configuration, the moved bolt 40 does not fall off, and the risk that the bolt 40 and the nut 41 fall off can be eliminated, and the ease of handling can be further improved.

  In the present embodiment, the bolt insertion space 12 formed in the large diameter flange 11 is a long hole extending from the radial inside RD2 to the outside RD1, and the bolt insertion space 22 formed in the small diameter flange 21 is formed in the radial inside RD2. Is a notch extending from the outside to the outside RD1.

  In the present embodiment, at least a radially inner portion of the bolt insertion spaces 12 and 22 formed in the flanges 11 and 21 extends along the radial direction RD. As described above, since the radially inner portions (roots) of the bolt insertion spaces 12 and 22 are along the radial direction RD, the rotation columns 2 are strong against the rotational moment and can be firmly fixed.

  In the present embodiment, the large-diameter flange 11 is a fixed-side flange 11 and the small-diameter flange 21 is a rotating-side flange 21. According to this configuration, since the large-diameter flange 11 is located below, it is possible to improve the appearance from below.

  The present disclosure is not limited to the embodiments described above, and various improvements and modifications can be made without departing from the spirit of the present disclosure.

<Modification>
For example, in the present embodiment, as shown in FIG. 2, the fixed flange 11 is a large-diameter flange and the rotating flange 21 is a small-diameter flange. That is, as shown in FIG. 4, the fixed flange 11 is a small-diameter flange, and the rotating flange 21 is a large-diameter flange. As described above, when the large-diameter flange is located above and the small-diameter flange is located below, dust is less likely to accumulate on the stepped portion between the large-diameter flange and the small-diameter flange, and corrosion is unlikely to occur.

  In the present embodiment, as shown in FIG. 2, the bolt insertion space 12 of the large-diameter flange 11 is a long hole terminated in the large-diameter flange, but is not limited to this. For example, as shown in FIG. 5A, the bolt insertion space 12 of the large diameter flange 11 may be a notch. In order to prevent the bolt from coming off, as shown in FIG. 5B, the radial outside of the bolt insertion space 12 of the large-diameter flange 11 must be narrower than the bolt diameter, or closed as shown in FIG. Is preferred.

  In the present embodiment, as shown in FIG. 2, the bolt insertion spaces 12, 22 formed in the flanges 11, 21 extend entirely along the radial direction RD, but the invention is not limited to this. For example, as shown in FIG. 5C, at least a radially inner portion of the bolt insertion spaces 12 and 22 formed in the flanges 11 and 21 extends along the radial direction RD. As described above, since the radially inner portions of the bolt insertion spaces 12 and 22, which are the portions to be fastened with the bolts 40, are along the radial direction RD, the rotational moments become strong, and the rotary column 2 can be firmly fixed.

  Further, as shown in FIGS. 5C, 5D and 5E, at least a radially outer portion of the bolt insertion spaces 12, 22 formed in the flanges 11, 21 is inclined with respect to the radial direction RD. Good. FIG. 5C shows that only the radially outer portions of the bolt insertion spaces 12 and 22 are inclined with respect to the radial direction RD. 5D and 5E, the entire bolt insertion spaces 12, 22 are inclined with respect to the radial direction RD. As described above, if the radially outer portions of the bolt insertion spaces 12 and 22 are inclined with respect to the radial direction RD, if the bolt 40 is moved to the radially outer side RD1 to some extent, the radially outer side RD1 is completely removed. , The bolt 40 can be moved to the radially outer side RD1 with the rotation of the rotary support 2.

<Second embodiment>
Hereinafter, a second embodiment of the present disclosure will be described with reference to the drawings. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  As shown in FIG. 6, the fixed side flange 111 and the rotating side flange 121 are formed to have the same diameter. Bolt insertion spaces 112 and 122 formed in both flanges 111 and 121 extend in the circumferential direction CD. Of course, if the bolt insertion space formed in at least one of the two flanges 111 and 121 extends along the circumferential direction CD, the rotating column 2 can rotate with respect to the fixed column 1. For example, the bolt insertion space 112 formed in the fixed-side flange 111 has an angle extending along the circumferential direction CD of 30 °, and the bolt insertion space 122 formed in the rotary-side flange 121 does not extend in the circumferential direction CD. If it is a hole, the rotation angle will be 30 °.

  On the other hand, as shown in FIG. 6, if both the bolt insertion spaces 112 and 122 formed in the flanges 111 and 121 extend along the circumferential direction CD, the rotation angle can be increased. For example, the bolt insertion space 112 formed in the fixed-side flange 111 extends along the circumferential direction CD, has an angle of 30 °, and the bolt insertion space 122 formed in the rotation-side flange 121 extends along the circumferential direction CD. If it extends and its angle is 30 °, the rotation angle will be 60 °. According to this configuration, securing the rotation angle with the two bolt insertion spaces can reduce the length of each bolt insertion space rather than securing the rotation angle with only one bolt insertion space. Therefore, it is possible to suppress a significant decrease in rigidity.

  Also, as shown in FIG. 6, the flanges 111 and 121 are provided with reinforcing ribs 113 and 123 for connecting the flanges 111 and 121 and the columns. The reinforcing ribs 113 and 123 are formed to be rotationally symmetric about the axis. Accordingly, the radial dimension of the reinforcing rib is suppressed, and interference with the bolt insertion spaces 112 and 122 long in the circumferential direction CD is avoided. That is, even if the diameter of the flanges 111 and 121 is not increased, securing of the rotation operation by the bolt insertion spaces 112 and 122 long in the circumferential direction CD and reinforcement by the reinforcing ribs 113 and 123 are performed in a limited diameter dimension. Can be compatible.

As described above, the rotary overhanging strut of the present embodiment is:
A fixed column 1 installed vertically,
A rotating support 2 vertically attached to an upper portion of the fixed support 1 and rotatable around the axis of the fixed support 1;
An arm 3 extending laterally from the rotating column 2;
A fixed-side flange 111 provided on the fixed column 1,
A rotating side flange 121 provided on the rotating column 2 and facing the fixed side flange 111;
A bolt 40 inserted into a bolt insertion space 112, 122 formed in both flanges 111, 121 and a nut 41 for fastening the two flanges 111, 121;
A bolt insertion space formed in at least one of the flanges 111 and 121 extends along the circumferential direction CD.

According to this configuration, the rotating column 2 can be rotated with respect to the fixed column 1 only by loosening the nut 41.
Therefore, it is not necessary to remove the nut 41 and the bolt 40, and the support can be rotated only by loosening the nut 41. Therefore, the risk of the bolt 40 and the nut 41 falling off can be reduced, and the ease of handling can be improved. Becomes

  In the present embodiment, the bolt insertion spaces 112 and 122 formed in both the flanges 111 and 121 extend along the circumferential direction CD.

  According to this configuration, securing the rotation angle between the two bolt insertion spaces 112 and 122 reduces the length of each bolt insertion space rather than securing the rotation angle using only one bolt insertion space. Therefore, it is possible to suppress the rigidity from being significantly reduced.

  In the present embodiment, the flanges 111 and 121 are provided with reinforcing ribs 113 and 123 for connecting the flanges 111 and 121 and the columns, and the reinforcing ribs 113 and 123 are formed to be rotationally symmetric about the axis. I have.

  According to this configuration, even if the diameter of the flanges 111 and 121 is not increased, the rotation operation is ensured by the bolt insertion spaces 112 and 122 that are long in the circumferential direction CD and the reinforcement is performed by the reinforcing ribs 113 and 123 in a limited diameter. And can be compatible.

  The present disclosure is not limited to the embodiments described above, and various improvements and modifications can be made without departing from the spirit of the present disclosure.

  For example, in the columns of the first embodiment and the second embodiment, the arm 3 extends from the rotating column 2 to only one side, but is not limited thereto. For example, a fixed support 1 may be installed on the median strip of the road, and a pair of arms may project from the rotating support 2 to the left and right, respectively.

  As shown in FIGS. 2 and 7, when the small-diameter cylindrical portion 10 provided on the fixed support 1 is inserted into the large-diameter cylindrical portion 20 provided on the rotary support 2, the fixed support 1 pivots the rotary support 2. It is a structure that supports it so that it can rotate around. In the example of FIG. 7, the large-diameter cylindrical portion 20 is provided with a protruding portion 50 that protrudes inward from the inner surface of the cylinder. Since the protrusion 50 uses the root of the arm 3, the strength can be easily secured. A regulating portion 51 is provided on the small-diameter cylindrical portion 10 to interfere with the projecting portion 50 in the circumferential direction. The restricting portion 51 is located at a position overlapping with the protruding portion 50 when viewed along the radial direction of the fixed column 1 and is provided at the same height position. The restricting portion 51 is formed by cutting out a part of the small-diameter cylindrical portion 10 in a range in which the rotation of the rotating column 2 is allowed. That is, the rotation angle regulating structure 5 that regulates the rotation angle of the rotating column 2 to a predetermined angle or less by the contact between the regulating portion 51 and the protruding portion 50 is provided. Of course, as described above, the fixed support 1 may be provided with a large-diameter tubular portion, and the rotary support 2 may be provided with a small-diameter tubular portion. In that case, the protrusion 50 is not the arm 3 but a separate member.

DESCRIPTION OF SYMBOLS 1 ... Fixed support | pillar 10 ... Small diameter cylinder part 2 ... Rotating support | pillar 20 ... Large diameter cylinder part 3 ... Arm 11, 111 ... Fixed side flange 13, 23, 113, 123 ... Reinforcement rib 12, 22, 112, 122 ... Bolt insertion space 21, 121 ... Rotating side flange 40 ... Bolt 41 ... Nut 5 ... Rotation angle regulating structure 50 ... Projecting part 51 ... Restricting part Ar1 ... Overlapping area Ar2 ... Non-overlapping area RD ... Radial direction RD1 ... Radial outside RD2 ... Radial inside CD: circumferential direction

Claims (12)

A fixed post installed vertically,
A rotating support that is vertically mounted on the top of the fixed support and is rotatable about the axis of the fixed support;
An arm extending laterally from the rotating column,
A fixed-side flange provided on the fixed support,
A rotating flange provided on the rotating support and opposed to the fixed flange,
A bolt inserted into the bolt insertion space formed on both flanges and a nut for tightening both flanges,
One flange is a large-diameter flange that is larger in diameter than the other, and the other flange is a small-diameter flange.When viewed along the axial direction, the overlapping area where the two flanges overlap, and the two flanges overlap. There is no non-polymerized area, and
A rotary overhanging strut having bolt insertion spaces formed in both flanges extending radially inward to outward so as to allow movement of the bolt from the overlap region to the non-overlap region.   The rotary overhanging post according to claim 1, wherein the bolt insertion space formed in the large-diameter flange terminates in the large-diameter flange.   The bolt insertion space formed in the large diameter flange is a long hole extending from the inside in the radial direction to the outside, and the bolt insertion space formed in the small diameter flange is a notch extending from the inside in the radial direction to the outside. Item 3. The rotary overhanging support according to item 1 or 2.   The rotary extension column according to any one of claims 1 to 3, wherein at least a radially inner portion of the bolt insertion space formed in each of the flanges extends in the radial direction.   The rotary extension column according to any one of claims 1 to 4, wherein at least a radially outer portion of the bolt insertion space formed in both flanges is inclined with respect to the radial direction.   The rotary overhanging post according to any one of claims 1 to 5, wherein the large-diameter flange is the fixed-side flange, and the small-diameter flange is the rotary-side flange.   The rotary overhanging post according to any one of claims 1 to 5, wherein the large-diameter flange is the rotation-side flange, and the small-diameter flange is the fixed-side flange. By inserting the small-diameter cylindrical portion provided on one of the fixed support and the rotary support into the large-diameter cylindrical portion provided on the other, the fixed support supports the rotary support rotatably around the axis. ,
The large-diameter cylindrical portion is provided with a protruding portion that protrudes inward from the inner surface of the cylinder, and the small-diameter cylindrical portion is provided with a restricting portion that interferes with the protruding portion in the circumferential direction. The rotary overhanging post according to any one of claims 1 to 7, further comprising a rotation angle restricting structure for restricting a rotation angle of the rotary post within a predetermined angle.   The rotation according to any one of claims 1 to 8, wherein a wire attachment portion is provided inside the fixed support column and the rotating support tube, and a drop-prevention wire connecting the two wire attachment portions is attached. Type overhang prop. A fixed post installed vertically,
A rotating support that is vertically mounted on the top of the fixed support and is rotatable about the axis of the fixed support;
An arm extending laterally from the rotating column,
A fixed-side flange provided on the fixed support,
A rotating flange provided on the rotating support and opposed to the fixed flange,
A bolt inserted into the bolt insertion space formed on both flanges and a nut for tightening both flanges,
Bolt insertion space formed on both of both flanges extends along the circumferential direction,
By inserting the small-diameter cylindrical portion provided on one of the fixed support and the rotary support into the large-diameter cylindrical portion provided on the other, the fixed support supports the rotary support rotatably around the axis. ,
The large-diameter cylindrical portion is provided with a protruding portion that protrudes inward from the inner surface of the cylinder, and the small-diameter cylindrical portion is provided with a restricting portion that interferes with the protruding portion in the circumferential direction. A rotary overhanging column provided with a rotation angle restricting structure for restricting the rotation angle of the rotary column within a predetermined angle. A fixed post installed vertically,
A rotating support that is vertically mounted on the top of the fixed support and is rotatable about the axis of the fixed support;
An arm extending laterally from the rotating column,
A fixed-side flange provided on the fixed support,
A rotating flange provided on the rotating support and opposed to the fixed flange,
A bolt inserted into the bolt insertion space formed on both flanges and a nut for tightening both flanges,
Bolt insertion space formed on both of both flanges extends along the circumferential direction,
A rotary overhanging support, wherein a wire mounting portion is provided inside the fixed support and rotating support tubes, and a fall-off prevention wire connecting the two wire mounting portions is mounted. The rotary overhang support according to any one of claims 1 to 11 , wherein at least one of the nut and the bolt is provided with a retaining structure.

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