JP2018118698A - Apparatus for changing display machine and method for changing display machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for changing a display machine and a method for changing a display machine capable of reducing the labor time required to change a display machine mounted on a post.SOLUTION: An apparatus 100 for changing a display machine comprises a support 10 fixed to a post P being nearly circular in cross section, and a rotation body 20 attached rotatably to the post P with the post P serving as the axis thereof and mounted on a top surface 10a of the support 10. The rotation body 20 is provided with a joint 21 to which a mounting member 30 (cross arm 31 and U-bolt 32) on which a display machine 1 is arranged on an end portion 31a thereof is attached. By using such an apparatus for changing a display machine, an existing display machine 1 can be quickly rotatably moved to a retreat position from which it can be removed. A new display machine 1 can also be quickly rotatably moved to a prescribed installation position; therefore it is possible to reduce the labor time for changing the display machine 1. Thus, by reducing the labor time required per display machine 1, it is possible to perform the change over work for multiple display machines 1 within a prescribed time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display switching device used when performing a new / old switching operation of a display installed on a pillar, and a display switching method using the display switching device.

Conventionally, display devices such as railway track indicators and traffic lights are installed and attached to pillars erected on the side of the track using mounting brackets made of armatures or U bolts (for example, , See Patent Document 1).
The mounting bracket of Patent Document 1 has a structure in which a traffic light is rotatably supported by a pair of upper and lower arm brackets, and when an operator checks the traffic light for contamination, the traffic light is made easier to perform. It is possible to switch the direction of.

JP 2013-241120 A

However, when switching the traffic light attached to the pillar with the mounting bracket as in Patent Document 1 to a new traffic light, the nut that is screwed to the U bolt is removed and the old traffic light is removed. If the screwed nut is rusted, it may take time to remove it.
A plurality of indicators such as traffic lights and route indicators are installed along the track, and if the work time per aircraft is prolonged, it will be short within a predetermined time (for example, at night when there is no train operation) Since the switching work for replacing all the display devices cannot be completed in the time zone), there is a problem that the number of workers must be increased so that the switching work can be surely completed.
In addition, there is a problem that the number of workers to be increased cannot be properly judged unless the work time per machine is expected.

  An object of the present invention is to provide a display device switching device and a display device switching method capable of shortening an operation time for switching a display device attached to a pillar.

In order to achieve the above object, one invention according to the present application is a display switching instrument,
A support body having a smooth upper surface fixed to a column having a substantially circular cross-section on which the display device is installed, and orthogonal to the axial direction of the column;
A rotating body that is rotatably attached to the pillar with the pillar as an axis, and is placed on the upper surface of the support;
With
The rotating body is provided with a joint portion to which a mounting bracket on which the display device is disposed is joined, and the mounting bracket joined to the joint portion sandwiches the column. Attached to the pillar,
The display device is fixed to the column by press-contacting the mounting bracket against the peripheral surface of the column, and the display unit is attached to the column via the rotating body by loosening the press-contact of the mounting bracket. It was configured to be rotatable about the axis.

  With the display device switching device having such a configuration, the display device can be fixed to the column by pressing the mounting bracket on which the display device is disposed against the peripheral surface of the column. Further, by loosening the pressure contact of the mounting bracket, the display device can be rotationally moved through the rotating body with the column as the axis.

When switching between the old and new display units attached to the pillars, use the display switcher in advance to place the existing display units on the pillars, and attach the mounting bracket to the peripheral surface until the switching work is performed. For example, an existing display is fixed to the front side of the column.
And when performing the switching work, if the pressure contact of the mounting bracket is loosened, the rotating body can rotate around the column on the upper surface of the support body, so the existing display device is rotated and moved through the rotating body, For example, the existing display device can be quickly moved to the retracted position on the rear side of the column.
That is, if the existing display device that is the removal target can be quickly moved to the retreat position where the removal work is performed, the work time for switching the display device attached to the pillar can be shortened.

In addition, the display unit to be newly installed on the column is placed in a state where the display unit is installed on the column using a display switching device, and the mounting bracket is pressed against the peripheral surface of the column until the switching operation is performed. The indicator to be used is fixed on the rear side of the column.
Then, when performing the switching work, if the pressure contact of the mounting bracket is loosened, the rotating body can rotate around the column on the upper surface of the support, so the newly installed display device is rotated and moved through the rotating body, The newly installed display can be quickly moved to a predetermined installation position on the front side of the pillar, for example.
That is, if the newly installed display device can be quickly moved to a predetermined installation position, the work time for switching the display device attached to the pillar can be shortened.

Also, preferably
The rotating body is
A sliding contact body having a smooth sliding contact surface that is in sliding contact with the upper surface of the support, and wherein the joint is fixed;
A bearing body in which the inner peripheral surface abuts on the peripheral surface of the column and the sliding contact body is attached to the outer peripheral surface side;
Be prepared.
By doing so, the rotator suitably rotates on the upper surface of the support with the column as the axis.

Also, other inventions related to this application are:
A display switching method using a display switching device,
The display device attached to the column by the display device switching instrument is rotated from the first position to the second position by rotating the column about the axis through the rotating body of the display device switching instrument. To change the layout of the display.
By doing so, the work time for switching the display attached to the pillar can be shortened.
For example, the arrangement of the display device is switched from the retracted position that is the first position to a predetermined installation position that is the second position, or from the predetermined installation position that is the first position to the retracted position that is the second position. The work time for switching the arrangement of the display devices can be shortened.

Also, other inventions related to this application are:
A display switching method using a display switching device,
The display device is attached to a joint portion of the display switching device while attaching a mounting bracket, which is attached to the column so as to sandwich a column having a substantially circular cross section and in which an existing display device is disposed. A first step of attaching a switching device to the pillar;
A second step in which the existing display device is rotated around the column through the rotating body of the display device switching tool, and the existing display device is moved to a retractable position capable of being removed; and
I was prepared to.

  While joining the mounting bracket on which the existing display device to be removed is joined to the joint of the display switching device and attaching the display switching device to the pillar, the existing display device The display attached to the column can be quickly rotated to the retractable retreat position (for example, the existing display can be rotated from the front side of the column to the retreat position on the rear side of the column). The work time for switching the machine can be shortened.

Also, preferably
In addition to the display switching device to which the mounting bracket on which the existing display device is disposed is joined, another display device is mounted on the column and a new display device is disposed. A third step of joining the mounting bracket to the joint portion of the other display device switching tool;
A fourth step of moving the new display device to a predetermined installation position by rotating the new display device around the axis through the rotating body of the other display device switching tool;
Be prepared.

  Join the mounting bracket on which the new display device is installed to another display device switching device attached to the pillar, and attach the new display device to the pillar. (For example, a new display can be rotated from the rear side of the column to a predetermined installation position on the front side of the column), so the display attached to the column The work time for switching the machine can be shortened.

Also, preferably
The third step is a step performed before the second step.
By doing so, it is possible to suitably remove the existing display device and install a new display device.

  ADVANTAGE OF THE INVENTION According to this invention, the work time which switches the display machine attached to the pillar can be shortened.

It is a perspective view which shows the state which installed the display apparatus in the pillar using the display-device switching instrument of this embodiment. It is a side view showing the state where the indicator was installed in the pillar using the indicator change instrument of this embodiment. The perspective view (a) which shows the rotary body of the display device switching instrument of this embodiment, the perspective view (b) which shows the bearing body of the rotary body, and the support body of the display device switching instrument of this embodiment are shown. It is a perspective view (c). It is the side view (a) which shows the rotary body of the display-device switching instrument of this embodiment, and a front view (b). It is a side view which shows the existing display installed in the pillar with a pair of upper and lower mounting brackets. It is a side view which shows the state which attached a pair of indicator switch instrument to the pillar. It is a side view which shows the state which attached the indicator newly installed through a pair of indicator switch instrument to the pillar. It is a side view which shows the state which rotationally moved the existing display apparatus to the retracted position, and rotated the new display apparatus to the predetermined installation position. It is a side view which shows the state which removed the existing indicator and its attachment metal fitting, and installed the new indicator on the pillar. It is a side view which shows the other Example regarding the display apparatus switching method.

  Hereinafter, embodiments of a display device switching device and a display device switching method according to the present invention will be described in detail with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

As shown in FIGS. 1, 2, 3 (a), (b), (c), and FIGS. 4 (a) and (b), the display device switching instrument 100 according to the present embodiment includes The support 10 having a smooth upper surface 10a that is fixed to a column P having a substantially circular cross-section in which the display device 1 is installed and is orthogonal to the axial direction of the column P, and the column P with the column P as an axis. And a rotating body 20 mounted on the upper surface 10a of the support body 10.
Further, the rotating body 20 is provided with a joint portion 21 to which a mounting bracket 30 on which the display device 1 is disposed is joined, and the mounting bracket 30 joined to the joint portion 21 includes: It is attached to the pillar P so as to sandwich the pillar P. In addition, a hole 21 a for joining the mounting bracket 30 (an armature 31 and a U bolt 32 described later) is formed in the joint portion 21.

  This display device switching device 100 is a device used when performing a new / old switching operation of the display device 1 installed on the pillar P, and can quickly move an existing old display device 1 to a retractable position where it can be removed. The new display device 1 to be newly installed is used for quickly moving to a predetermined installation position.

The railway display 1 is installed on a pillar P standing on the side of the track, and is a device that displays numbers, characters, and the like for indicating a course to a train driver.
In the present embodiment, mounting brackets 30 are respectively provided on the upper and lower portions of the display device 1, and the display device 1 is mounted on the pillar P by the mounting bracket 30.

The mounting bracket 30 includes, for example, a brace 31 and a U bolt 32.
The display 1 is disposed at one end 31 a of the arm 31, and a U bolt 32 is joined to the other end 31 b of the arm 31 by a nut N. A hole through which the U bolt 32 is inserted is formed in the other end 31b of the arm metal 31.
When the display device 1 is attached to the pillar P by the mounting bracket 30, as shown in FIG. 5, the arm metal 31 and the U bolt 32 are inserted so that the U bolt 32 is inserted into the hole of the other end 31 b of the arm metal 31. Then, the pillar P is sandwiched, and a nut N is fastened to the U bolt 32 to fix the mounting bracket 30 to the pillar P.
Further, when the display device 1 is attached to the column P by using the mounting bracket 30 and the display device switching device 100 together, the U bolt 32 in the mounting bracket 30 is connected to the hole in the other end 31b of the arm metal 31 and the display device switching. The column P is inserted between the U-bolt 32 and the arm metal 31 and the nut N is fastened to the U-bolt 32 and fixed to the column P (see FIG. 2).

As shown in FIG. 3 (c), the support 10 is a metal structure in which a pair of half cylinders 11 are joined by bolts B and nuts N, and the bolts B and nuts N are fastened. It is fixed to the pillar P.
The semi-cylindrical body 11 includes a semi-cylindrical portion 12 and flange portions 13 respectively provided at the upper end and the lower end of the semi-cylindrical portion 12.
The upper surface of the upper flange portion 13 is formed smoothly and forms the smooth upper surface 10a of the support 10.
Moreover, the half cylinder part 12 has a curved surface corresponding to the diameter of the pillar P so that the inner surface of the half cylinder part 12 is in close contact with the peripheral surface of the pillar P, and the pillar P is formed by the pair of half cylinders 11. It can be pinched.

  As shown in FIG. 3A, the rotating body 20 includes a sliding contact body 22 having a smooth sliding contact surface 22a that is in sliding contact with the upper surface 10a of the support 10, and a joint portion 21 fixed thereto. A bearing body 23 having a circumferential surface abutting on the circumferential surface of the column P and a sliding contact body 22 attached to the outer circumferential surface side is provided.

The sliding contact body 22 is a metal member having a substantially U-shape in a side view, and a metal joint portion 21 having a substantially L-shape in a side view is joined to a top surface of the top surface portion with a bolt B and a nut N. ing.
Further, the bottom surface of the bottom surface portion of the sliding contact body 22 is formed smoothly and forms a sliding contact surface 22 a of the rotating body 20.

As shown in FIG. 3B, the bearing body 23 has a pair of roller bearing portions 23a.
The roller bearing portion 23a is arranged in an arc shape with two upper and lower arc plates 24 and a plurality (seven in this embodiment) of rollers 25 supported rotatably between the two arc plates 24. The outer wall board 26 which covers the outer peripheral side of the row | line | column of the some roller 25 is provided.
The circular arc plate 24 is a metal flat plate member having a substantially C shape, and the upper and lower circular arc plates 24 are arranged in parallel to each other.
The roller 25 is a metal roller member that rotates around an axis perpendicular to the arc plate 24. Note that a coating layer made of a resin material such as urethane may be provided on the peripheral surface of the roller 25.
The outer wall plate 26 is a member formed by bending a metal plate into a substantially Ω shape, and sandwiched end portions 26a are provided at both ends thereof. A hole 26b is formed in the sandwiching end portion 26a.

The substantially circular bearing body 23 is formed by facing the inner circumferential side of the arc of the pair of roller bearing portions 23a and assembling the sandwiching end portions 26a of the outer wall plate 26 together.
Further, the rotating body 20 is joined with the bolt B and the nut N in a state where the side surface portion of the sliding contact body 22 is sandwiched by the sandwiching end portion 26a of the outer wall plate 26 of the bearing body 23 (see FIG. 3A). Is assembled. A hole through which the bolt B is inserted is also formed in the side surface portion of the sliding contact body 22.
A plurality (14 (7 × 2) in this embodiment) of rollers 25 arranged on the inner peripheral surface side of the bearing body 23 in the rotating body 20 abuts on the peripheral surface of the pillar P. .
Further, the sliding contact body 22 is attached to the outer peripheral surface side of the bearing body 23 in the rotating body 20 via the outer wall plate 26.

As shown in FIGS. 1 and 2, the mounting bracket 30 is joined to the joint portion 21 of the display device switching instrument 100, and the display device 1 is connected to the column P by using the mounting bracket 30 and the display device switching instrument 100 together. In the state where the display 1 is attached, the nut 1 screwed to the U bolt 32 is tightened so that the arm metal 31 of the mounting bracket 30 and the U bolt 32 are pressed against the peripheral surface of the pillar P. It is fixed to P.
For example, at a predetermined installation position outside the building limit, the display device 1 is fixed to the column P so that the train driver can properly view the display surface of the display device 1.

Further, by loosening the nut N screwed to the U bolt 32 so as to loosen the pressure contact of the mounting bracket 30 (arm metal 31, U bolt 32) joined to the joint portion 21, the display device 1 is rotated by the rotating body 20. It becomes possible to rotate the column P about the axis through the axis.
When the display device 1 is rotated via the rotating body 20, the sliding contact surface 22 a of the rotating body 20 (sliding contact body 22) rotates so as to slide on the upper surface 10 a of the support 10.

  Next, a display device switching method using the display device switching instrument 100 of the present embodiment will be described.

As shown in FIG. 5, the existing display device 1 is installed by being attached to the pillar P by a pair of upper and lower mounting brackets 30.
In order to remove the existing display device 1 and perform a switching operation to install a new display device 1, the display device switching device 100 is attached in advance so that the existing display device 1 can be quickly removed. .
That is, as shown in FIG. 2, the mounting bracket 30 is bonded to the joint portion 21 of the display device switching device 100, and the display device 1 is mounted to the column P by using the mounting bracket 30 and the display device switching device 100 together. Put it in a state.

The display device switching device 100 is attached to one of the upper and lower pair of mounting brackets 30, and then one by one up and down, like the other.
Specifically, the nut N screwed to the U bolt 32 of either the upper or lower mounting bracket 30 is removed, and the joint portion 21 fixed to the sliding contact body 22 is assembled to the U bolt 32. After assembling the joint 21 to the U bolt 32, the nut N once removed is screwed again to the U bolt 32, and the mounting bracket 30 (arm metal 31, U bolt 32) is attached to the peripheral surface of the column P. Press contact.
Next, a pair of roller bearing portions 23 a is assembled so as to sandwich the sliding contact body 22. At this time, the pair of roller bearing portions 23a are arranged to sandwich the column P therebetween.
If the pair of roller bearing portions 23 a sandwiching the sliding contact body 22 are joined with the bolt B and the nut N to assemble the bearing body 23, the rotating body 20 is attached to the column P.

Next, the pair of half cylinders 11 is assembled to the pillar P so as to support the rotating body 20, and the support body 10 formed by joining with the bolt B and the nut N is attached. At this time, the sliding contact surface 22a of the rotating body 20 and the upper surface 10a of the support 10 are brought into close contact with each other.
According to such a procedure, one mounting bracket 30 and the display device switching instrument 100 are joined, and the attachment of the display device switching instrument 100 to the pillar P is completed.
Further, the display device switching device 100 is joined to the other mounting bracket 30 in the same procedure, and the display device switching device 100 is attached to the column P.
In this manner, as shown in FIG. 2, the existing display device 1 is attached to the pillar P by using the mounting bracket 30 and the display device switching device 100 together.
In addition, when attaching the display device switching device 100 to the pillar P, the mounting bracket 30 to which the display device switching device 100 is joined does not function, so a holding structure that supports the display device 1 is temporarily installed. It is preferable.

Next, the display device switching device 100 different from the display device switching device 100 to which the mounting bracket 30 on which the existing display device 1 is disposed is joined is attached to the pair of pillars P.
Specifically, a pair of half cylinders 11 are assembled to a pillar P, and a support 10 formed by joining bolts B and nuts N is attached.
On the upper surface 10a of the support body 10, a sliding contact body 22 having a joining portion 21 fixed thereon is placed, the sliding contact body 22 is sandwiched between a pair of roller bearing portions 23a, and the pair of roller bearing portions 23a are bolted. The rotating body 20 is attached to the column P so that the bearing body 23 is assembled by joining with B and nuts N.
In such a procedure, as shown in FIG. 6, the pair of display device switching instruments 100 is attached to the pillar P.

Next, the other end portion of the arm 31 on which the newly installed small display device 1 is disposed at one end portion is aligned with the joint portion 21 of the pair of display device switching devices 100 attached to the pillar P, and the others. The U bolt 32 is inserted into the hole at the end and the hole 21 a of the joint 21, and the U bolt 32 is assembled so that the pillar P is sandwiched between the U bolt 32 and the arm metal 31, and the nut N is screwed into the U bolt 32. To wear. The nut N is tightened, and the mounting bracket 30 (arm metal 31, U bolt 32) is pressed against the peripheral surface of the column P.
In such a procedure, as shown in FIG. 7, the mounting bracket 30 on which the new small display device 1 is disposed is joined to the joint portion 21 of the pair of display device switching devices 100 attached to the pillar P. To do.
At this time, the new small-sized display device 1 is outside the limits of construction and is fixed at a position that does not interfere with the existing display device 1.

  In this manner, the display device switching device 100 is joined to the mounting brackets 30 of all the existing display devices 1 to be switched, and all the pillars P on which the existing display devices 1 are installed. The work of attaching the mounting bracket 30 provided with the new small display device 1 by using the display device switching tool 100 is performed in advance of the switching operation.

Next, when the old and new display devices 1 are switched, the pressure fitting of the mounting bracket 30 joined to the joint portion 21 of each display device switching instrument 100 of the existing display device 1 and the new small display device 1 is performed. The nut N screwed to the U bolt 32 is loosened so as to loosen.
In this way, the display device 1 installed on the pillar P using the display device switching instrument 100 can be rotated via the rotating body 20 around the pillar P as an axis.
Then, as shown in FIG. 8, the existing display device 1 is rotated about the column P through the rotating body 20 of the display device switching instrument 100, and the existing display device 1 is moved to a retracted position where it can be removed. Move. (In the figure, the existing display 1 is rotated from the left side to the right side of the column P.)
In addition, a new small display device 1 is rotated about the column P through the rotating body 20 of the display device switching instrument 100, and the newly installed display device 1 is moved to a predetermined installation position. (In the figure, the new display 1 is rotated from the right side to the left side of the column P.)
Note that either the movement of the existing display device 1 or the movement of the new small display device 1 may be performed first or may be performed simultaneously.
After the display device 1 is moved to a predetermined position, a nut N is fastened to the U bolt 32, and the mounting bracket 30 (arm metal 31, U bolt 32) is pressed against the peripheral surface of the column P, and the display device is displayed. 1 is fixed to the pillar P.
It should be noted that the substantial switching operation has been completed at the stage where the newly installed display device 1 is fixed at a predetermined installation position (a position where the train operator can preferably visually recognize the display surface of the display device 1).

Next, as shown in FIG. 9, the existing display device 1 and its mounting bracket 30 moved to the retracted position are removed from the pillar P, and the display device switching unit connected to the mounting bracket 30 of the existing display device 1 is used. By removing the instrument 100 from the column P, the switching operation of the old and new display devices 1 can be completed.
In addition, since the existing display device 1 moved to the retracted position and its mounting bracket 30 are outside the building limit, they may not be removed immediately but may be removed at a later date.

Further, the display device switching device 100 joined to the mounting bracket 30 of the new small display device 1 may be mounted as it is as shown in FIG. 9 for the next new / old switching operation.
Further, the display device switching device 100 is removed from the pillar P by a procedure reverse to the procedure for mounting the display device switching device 100 described above, and the mounting bracket 30 on which the new small display device 1 is disposed is used. The newly installed display 1 may be installed on the pillar P.

As described above, when the display device switching instrument 100 of the present embodiment is used, the existing display device 1 can be quickly moved to a retractable position where the display device 1 can be removed. Since 1) can be quickly moved to a predetermined installation position, the work time for switching the display 1 can be shortened.
Then, by shortening the work time per display device 1, it is possible to perform a switching operation of a plurality of display devices 1 within a predetermined time.

In other words, if the display switching device 100 is connected to the mounting bracket 30 of the existing display 1 in advance, troubles due to rusting of the U bolts 32 and the nuts N will not occur during the switching operation. The switching work time is not prolonged.
In addition, if the existing display 1 and its mounting bracket 30 are moved to a retreat position outside the building limit, they may be removed at a later date according to the worker's schedule, so that there is room. Switching operation of the display device 1 can be performed.

The present invention is not limited to the above embodiment.
When switching between the old and new display devices 1, for example, as shown in FIG. 10, the display device fixing device 40 is fixed to the pillar P, and the display device fixing device 40 is used to create a new small display device 1. Installation may be performed.
The display device fixing device 40 has a structure in which hook portions 41 for installing the display device are arranged on both sides of the column P while being fixed to the column P.

When the display device 1 is switched, the display device switching device 100 is joined to the mounting bracket 30 of the existing display device 1, and then the display device fixing device 40 is fixed to the column P. A new small-sized display device 1 is installed on one hook portion 41 of 40 (right hook portion 41 in the figure). At this time, the new small-sized display device 1 is outside the limits of construction and is installed at a position that does not interfere with the existing display device 1.
Next, the existing display device 1 is rotated about the column P via the rotating body 20 of the display device switching device 100, and the existing display device 1 is moved to a retractable position where the display device 1 can be removed. The new and old switching operation of the display device 1 can be performed by moving and installing a new small display device 1 on the other hook portion 41 (the left hook portion 41 in the figure) of 40.

  Even in this case, the existing display device 1 can be quickly moved to the retractable position where it can be removed, and the newly installed display device 1 (new small display device 1) can be quickly moved to the predetermined installation position. Therefore, the work time for switching the display device 1 can be shortened.

  In addition, in the above embodiment, although the rotary body 20 which has the bearing body 23 which is a rolling bearing (roller bearing) provided with the some roller 25 was demonstrated to the example, this invention is not limited to this. For example, the rotating body 20 having a bearing body of a sliding bearing may be used.

  Further, in the above embodiment, the display device switching instrument 100 is used mainly for the purpose of promptly moving the existing display device 1 to a retractable position where it can be removed, but the present invention is limited to this. For example, the display device switching instrument 100 may be used only for quickly moving the newly installed display device 1 to a predetermined installation position.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

1 indicator (route indicator)
DESCRIPTION OF SYMBOLS 10 Support body 10a Upper surface 11 Half cylinder body 12 Half cylinder part 13 Flange part 20 Rotating body 21 Joint part 21a Hole 22 Sliding body 22a Sliding surface 23 Bearing body 23a Roller bearing part 24 Arc plate 25 Roller 26 Outer wall board 26a Nipping end Part 26b Hole 30 Mounting bracket 31 Arm metal 32 U bolt 40 Display fixing device 41 Hook part 100 Display switching device P Pillar B Bolt N Nut

Claims (6)

A support body having a smooth upper surface fixed to a column having a substantially circular cross-section on which the display device is installed, and orthogonal to the axial direction of the column;
A rotating body that is rotatably attached to the pillar with the pillar as an axis, and is placed on the upper surface of the support;
With
The rotating body is provided with a joint portion to which a mounting bracket on which the display device is disposed is joined, and the mounting bracket joined to the joint portion sandwiches the column. Attached to the pillar,
The display device is fixed to the column by press-contacting the mounting bracket against the peripheral surface of the column, and the display unit is attached to the column via the rotating body by loosening the press-contact of the mounting bracket. A display device switching device characterized by being configured to be rotatable about an axis. The rotating body is
A sliding contact body having a smooth sliding contact surface that is in sliding contact with the upper surface of the support, and wherein the joint is fixed;
A bearing body in which the inner peripheral surface abuts on the peripheral surface of the column and the sliding contact body is attached to the outer peripheral surface side;
The display device switching device according to claim 1, further comprising: A display switching method using the display switching device according to claim 1 or 2,
The display device attached to the column by the display device switching instrument is rotated from the first position to the second position by rotating the column about the axis through the rotating body of the display device switching instrument. And switching the arrangement of the display device. A display switching method using the display switching device according to claim 1 or 2,
The display device is attached to a joint portion of the display switching device while attaching a mounting bracket, which is attached to the column so as to sandwich a column having a substantially circular cross section and in which an existing display device is disposed. A first step of attaching a switching device to the pillar;
A second step in which the existing display device is rotated around the column through the rotating body of the display device switching tool, and the existing display device is moved to a retractable position capable of being removed; and
A display device switching method characterized by comprising: In addition to the display switching device to which the mounting bracket on which the existing display device is disposed is joined, another display device is mounted on the column and a new display device is disposed. A third step of joining the mounting bracket to the joint portion of the other display device switching tool;
A fourth step of moving the new display device to a predetermined installation position by rotating the new display device around the axis through the rotating body of the other display device switching tool;
The display device switching method according to claim 4, further comprising:   The display device switching method according to claim 5, wherein the third step is a step performed before the second step.

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