JP7535708B2 - pole - Google Patents

Description

The present invention relates to a pole that is installed outdoors, etc.

Police poles for installing street lights have been disclosed in which devices such as mobile phone base stations or radios are installed in the internal space of the pole body to give the pole multiple functions as a street light pole, etc. (for example, Patent Document 1).

JP 2018-195501 A

Poles for street lights and other equipment are usually installed outdoors, so moisture can easily accumulate inside the pole, causing the pole to corrode. In addition, as poles become more multifunctional, they tend to become larger, and there is a demand for smaller poles to reduce costs, conserve resources, and make installation easier.

Therefore, the objective of the present invention is to provide a pole that is less susceptible to corrosion and can be made smaller in diameter.

A pole according to one aspect of the present invention comprises a cylindrical pole body to the outer surface of which a heat-generating device is attached, and the pole body has an air hole formed above the position where the device is attached, through which air can flow in and out of the inside of the pole body.

The pole of the present invention is less susceptible to corrosion and can be made smaller in diameter.

FIG. 1 is a front view showing a schematic configuration of a pole according to an embodiment. FIG. 2 is a cross-sectional view of the pole according to the embodiment taken along the line II-II in FIG. FIG. 3 is a cross-sectional view of the pole according to the embodiment taken along line III-III in FIG. FIG. 4 is a cross-sectional view showing a schematic configuration of a pole according to a modified example of the embodiment.

The following describes the embodiments in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention.

In addition, in this specification, terms indicating the relationship between elements, such as "parallel," terms indicating the shape of elements, such as "rectangle," and numerical ranges are not expressions that express only the strict meaning, but are expressions that include a substantially equivalent range, for example, a difference of about a few percent.

In addition, each figure is a schematic diagram in which emphasis, omissions, or adjustments to the ratio have been made as appropriate to illustrate the present invention, and is not necessarily an exact illustration, and may differ from the actual shape, positional relationship, and ratio.

(Embodiment)
The pole according to this embodiment will be described below.

First, the configuration of the pole in this embodiment will be explained using Figures 1 to 3.

Figure 1 is a front view showing the schematic configuration of a pole 1 according to this embodiment. Figure 2 is a cross-sectional view of the pole 1 taken along line II-II in Figure 1. Figure 3 is a cross-sectional view of the pole 1 taken along line III-III in Figure 1.

As shown in Figs. 1 to 3, the pole 1 according to this embodiment includes a pole body 10, a mounting member 20, equipment 30, and a lighting fixture 50. In this embodiment, the pole 1 is an outdoor light such as a street light provided with a lighting fixture 50. The pole 1 is installed in an outdoor space such as a road, a park, a parking lot, a beach, a riverbank, a forest road, the grounds of an apartment building, or the grounds of a factory.

The pole body 10 is a cylindrical columnar body standing in a substantially vertical direction from the ground 70. An internal space 15 is formed in the cylindrical pole body 10. In the example shown in FIG. 2, the cross-sectional shape of the outer periphery of the pole body 10 is circular. The cross-sectional shape of the outer periphery of the pole body 10 is not particularly limited, and may be a polygon such as a rectangle or an ellipse. In addition, the width (thickness) of the pole body 10 may be constant in the height direction or may differ in the height direction. When the width of the pole body 10 differs in the height direction, the width of the pole body 10 differs, for example, at the upper end and the lower end of the pole body 10. When the width of the pole body 10 differs at the upper end and the lower end of the pole body 10, for example, the width of the upper end is smaller than the width of the lower end. When the width of the pole body 10 differs at the upper end and the lower end of the pole body 10, the pole body 10 may be tapered or stepped. The height of the pole body 10 from the ground 70 is, for example, 3 m or more and 12 m or less. The width of the lower end of the pole body 10 is, for example, 80 mm or more and 200 mm or less.

The lower end of the pole body 10 is open, and the lower end of the pole body 10 is embedded in the ground 70. This fixes the pole body 10 to the ground 70. The upper end of the pole body 10 is not open, and the structure is such that water such as rain does not enter the internal space 15. In other words, the pole body 10 has a bottomed cylindrical shape with the upper end side of the pole body 10 as the bottom surface. The pole body 10 is made of metal, for example. In this embodiment, even if the pole body 10 is made of metal and is easily corroded by moisture, the moisture in the internal space 15 is efficiently discharged to the outside, as described below, so that the pole body 10 is less likely to corrode.

The heat-generating device 30 is attached to the outer surface 101 of the pole body 10. Specifically, the heat-generating device 30 is attached to the outer surface 101 of the pole body 10 via the mounting member 20.

The pole body 10 has an air vent 11 formed above the position where the equipment 30 is attached, through which air flows in and out of the interior (internal space 15) of the pole body 10. The air vent 11 and the air vent 12 connect the internal space 15 to the outside air. The air vent 11 is formed, for example, at a position that is a distance of less than one-third of the height of the pole body 10 from the upper end of the pole body 10. The pole body 10 also has an air vent 12 formed below the positions where the air vent 11 and the equipment 30 are attached. The air vent 12 is formed at a position of the pole body 10 that is not in contact with the housing 22, or in the illustrated example, on the opposite side of the pole body 10 from the housing 22 side.

The ventilation holes 11 and 12 are holes formed so as to penetrate from the outside of the pole body 10 to the internal space 15. The ventilation holes 11 and 12 are different from minute holes such as screw holes through which air does not substantially enter or exit. The ventilation holes 11 and 12 open on the outer surface of the pole body 10 (specifically, the outer surface 101). The opening shapes of the ventilation holes 11 and 12 are not particularly limited, and may be, for example, polygonal such as a rectangle, circular, elliptical or semicircular. The number of the ventilation holes 11 and 12 may be one or more. The positions of the ventilation holes 11 and 12 in the circumferential direction of the pole body 10 are not particularly limited, and may be any position that can generate the air flow described later. In addition, when a plurality of ventilation holes 11 and 12 are formed, the arrangement of the plurality of ventilation holes 11 and 12 is not particularly limited. The multiple ventilation holes 11 and 12 may be arranged in the direction in which the pole body 10 is erected (vertical direction), in the circumferential direction of the pole body 10, or in a matrix. The opening area of the ventilation holes 11 and 12 is not particularly limited as long as it is large enough to generate an air flow, which will be described in detail later. From the viewpoint of the insertion of the cable 35 and the amount of air flow, which will be described later, the width of the opening of the ventilation holes 11 and 12 is, for example, 2 mm or more at the narrowest part. The ventilation hole 12 may be located above the equipment 30. In addition, if air can enter the internal space 15 from a place other than the ventilation hole 12, such as the opening at the lower end of the pole body 10, the pole body 10 does not need to be provided with the ventilation hole 12.

For example, a cable 35 connected to the equipment 30 is inserted through the ventilation hole 11. The cable 35 is, for example, a cable connected to a power line (not shown) provided on an external utility pole for supplying power to the equipment 30. The cable 35 may also be a cable for communication of the equipment 30, such as optical fiber. The cable 35 penetrates the pole body 10 and the housing 22 and is connected to the equipment 30. By inserting the cable 35 through the ventilation hole 11, it is not necessary to form a separate hole or the like for inserting the cable 35, and the pole 1 can be easily installed. Although not shown, the cable 35 may, for example, branch midway and be connected to the lighting fixture 50 to supply power to the lighting fixture 50 as well. Note that the cable 35 for supplying power to the equipment 30 does not have to be inserted through the ventilation hole 11. For example, the cable 35 may pass through the internal space 15 and connect from the lower end of the pole body 10 to an underground power line. Also, the cable 35 may not branch, and the lighting device 50 may receive power from a source other than the cable 35.

The pole body 10 is also provided with a rain cover 40 to cover the outer and upper sides of the air vents 11 and 12 on the pole body 10.

The mounting member 20 is a frame for mounting the equipment 30 to the outer surface 101 of the pole body 10. The equipment 30 is fixed to the mounting member 20, so that the equipment 30 is attached to the pole body 10 via the mounting member 20. The mounting member 20 is an example of a heat transfer means for transferring heat from the equipment 30 to the pole body 10. In heat transfer by the mounting member 20, the heat of the equipment 30 is transferred to the pole body 10 by thermal conduction via the mounting member 20.

The mounting member 20 has a fixing band 21 and a housing 22.

The fixing band 21 is a member for fixing the housing 22 to the pole body 10. The fixing band 21 is a plate-like member shaped along the outer surface 101 of the pole body 10 and the outer surface 221 of the housing 22 on the pole body 10 side, and is in contact with the outer surface 101 and the outer surface 221. The fixing band 21 and the housing 22 are fixed by bolts or welding, etc. The pole body 10 is sandwiched between the fixing band 21 and the housing 22. The fixing band 21 may also be fixed to the pole body 10 by bolts, etc. The fixing band 21 is made of metal, for example.

The housing 22 is a container in which the equipment 30 is housed. The shape of the housing 22 is, for example, a rectangular parallelepiped, but may be other shapes such as a cylindrical or polygonal prism. The housing 22 includes a flat plate portion 23 that constitutes the pole body 10 side of the housing 22. The equipment 30 is fixed to the flat plate portion 23. The flat plate portion 23 is sandwiched between the equipment 30 and the pole body 10, and is in contact with the equipment 30 and the pole body 10.

The housing 22 is made of, for example, metal. Furthermore, the housing 22 only needs to have the flat plate portion 23 made of metal, and the portions other than the flat plate portion 23 may be made of a material other than metal, such as resin. Although not shown, the housing 22 may have an air vent through which air can flow in and out of the internal space of the housing 22. Furthermore, at least some of the faces of the housing 22 may be open.

The housing 22 is fixed to the pole body 10 by the fixing band 21. The housing 22 is in contact with the outer surface 101 of the lower end side of the pole body 10. Specifically, the flat plate portion 23 of the housing 22 is in contact with the outer surface 101 of the pole body 10. As a result, heat from the device 30 is conducted through the flat plate portion 23 of the housing 22 and transmitted to the pole body 10. The housing 22 is also disposed in contact with the ground 70. The housing 22 does not have to be in contact with the ground 70, and may be fixed to the pole body 10 so as to be disposed away from the ground 70. The housing 22 may be fixed in any manner as long as it is fixed in contact with the pole body 10, and may be fixed to the pole body 10 by a member other than the fixing band 21. The housing 22 may also be welded to the pole body 10.

A door 24 is provided on the housing 22, for example, on the side opposite the pole body 10 side of the housing 22. Workers or the like open the door 24 to install the equipment 30 and perform maintenance and inspection, etc.

The device 30 does not have to be housed in a container such as the housing 22. For example, the mounting member 20 may be configured to include a member consisting only of the flat plate portion 23 of the housing 22 and a fixing band 21.

The device 30 is a device that generates heat during operation. The device 30 is, for example, an electronic device having a power semiconductor. The power semiconductor is, for example, a power transistor used in the power amplifier and power supply circuit of the electronic device. In this way, since the device 30 is an electronic device having a power semiconductor, the pole 1 is multifunctional, and the heat generated by the power semiconductor during operation can expel moisture that has accumulated in the internal space 15, as described below.

The electronic device is, for example, a wireless communication device such as a mobile phone base station or a wireless LAN access point. In this way, since the electronic device is a wireless communication device that is normally constantly powered, heat is constantly generated due to the operation of power semiconductors used in the transmission power amplifier and power supply circuit of the wireless communication device. Also, although not shown, when the device 30 (electronic device) is a wireless communication device, an antenna connected to the wireless communication device may be attached to the upper end side of the pole body 10. In other words, the pole 1 may be used to fix an antenna for the wireless communication device. Note that the electronic device is not limited to a wireless communication device, and may be, for example, another electronic device such as a power supply unit.

The device 30 is housed inside the housing 22 of the mounting member 20. The device 30 is fixed to the mounting member 20, specifically, to the flat plate portion 23 of the housing 22 of the mounting member 20, and is in contact with the flat plate portion 23. The method of fixing the device 30 to the flat plate portion 23 is not particularly limited, and for example, the device 30 may be fixed to the flat plate portion 23 with a screw or the like, or a recess for fixing the device 30 may be provided in the flat plate portion 23. In this way, the device 30 is attached to the pole body 10 via the mounting member 20. The device 30 is attached, for example, at a position equal to or less than one-third of the height of the pole body 10. When viewed from the direction in which the device 30 is attached to the pole body 10, the width of the device 30 is, for example, greater than the width of the pole body 10.

The number of devices 30 may be one or more.

The lighting fixture 50 is supported by the pole body 10. The lighting fixture 50 is attached, for example, to the upper end of the pole body 10. The lighting fixture 50 has a light source 51, which is, for example, a light-emitting module in which a light-emitting element such as an LED is mounted, and a translucent cover 52 made of resin that transmits light from the light source 51 and diffuses the light from the light source 51. The lighting fixture 50 is not limited to this configuration, and may be any lighting fixture used in general street lights. In this way, by providing the lighting fixture 50 to the pole 1, the pole 1 can be used as an outdoor light such as a street light.

Next, an example of the air flow in the pole 1 according to this embodiment will be described with reference to FIG. 3. In FIG. 3, the arrows indicate the air flow when the device 30 is generating heat.

When power is supplied to the equipment 30, the equipment 30 generates heat. Since the equipment 30 is attached to the outer surface 101 of the pole body 10 via the mounting member 20, the heat of the equipment 30 is transferred to the pole body 10 by thermal conduction via the mounting member 20. Specifically, the heat of the equipment 30 first moves to the flat plate portion 23 and the fixing band 21 of the housing 22, and is transferred from the flat plate portion 23 and the fixing band 21 to the pole body 10. Then, the air in the internal space 15 near the position where the equipment 30 is attached is heated by the heat transferred to the pole body 10, and the density becomes lighter, so that air convection occurs in the internal space 15. Therefore, in the internal space 15, the heated air rises and is discharged to the outside through the air vent 11, and outside air is drawn into the internal space 15 through the air vent 12. As a result, since the pole 1 is installed in an outdoor space, moisture tends to accumulate in the internal space 15 of the pole body 10, but the air in the internal space 15 containing moisture rises and is discharged to the outside, and outside air is drawn into the internal space 15. As a result, the moisture in the internal space 15 is discharged, and corrosion of the pole body 10 due to moisture is suppressed. In addition, the heat of the equipment 30 is transferred to the pole body 10, so that the equipment 30 can also be cooled.

In addition, since moisture tends to accumulate at the bottom of the internal space 15, by attaching the equipment 30 near the bottom end of the pole body 10 (for example, at a position less than one-third of the height of the pole body 10), the air containing a lot of moisture is heated and rises, and is discharged through the ventilation hole 11. This allows moisture in the internal space 15 to be discharged more efficiently, and corrosion of the pole body 10 can be suppressed.

In addition, the equipment 30 is attached to the outer surface 101 of the pole body 10. As a result, as described above, even if the equipment 30 is attached, the equipment 30 is not installed inside the pole body 10 in order to exhaust moisture from the internal space 15 using the heat of the equipment 30, so the diameter of the pole body 10 can be made smaller. Also, even if the equipment 30 is made larger or there are more of them in order to increase the functionality or multi-function of the pole 1, the thickness of the pole body 10 is not affected by the size of the equipment 30, so the diameter of the pole body 10 can be made smaller.

As described above, the pole 1 comprises a cylindrical pole body 10 to which the equipment 30 is attached on the outer surface 101, and the pole body 10 has an air hole 11 formed above the position where the equipment 30 is attached. As a result, as described above, when the equipment 30 is attached to the outer surface 101 and generates heat, moisture in the internal space 15 of the pole body 10 is discharged through the air hole 11, making the pole 1 less susceptible to corrosion and allowing the pole 1 to have a small diameter.

[Modification]
In the following, modified examples of the embodiment will be described. In the following description of the modified examples of the embodiment, differences from the embodiment will be mainly described, and descriptions of commonalities will be omitted or simplified.

First, the configuration of the pole according to this modified example will be described using FIG. 4. FIG. 4 is a cross-sectional view showing the schematic configuration of pole 1a according to the modified example of the embodiment. As shown in FIG. 4, pole 1a has a pole body 10a and a mounting member 20a having a housing 22a, instead of the pole body 10 and the mounting member 20 having a housing 22 in the pole 1 according to the embodiment.

The pole body 10a is a cylindrical columnar body like the pole body 10, and instead of the vent hole 12 of the pole body 10, the pole body 10 has a structure in which the vent hole 13 through which the air warmed by the heat of the equipment 30 passes is formed. In detail, the pole body 10a has the vent hole 13 formed below the vent hole 11 and the position where the equipment 30 is attached. The vent hole 13 is an example of a heat transfer means for transferring heat from the equipment 30 to the pole body 10a. In the heat transfer by the vent hole 13, the air warmed by the heat of the equipment 30 enters the internal space 15a of the pole body 10a through the vent hole 13, and the heat of the equipment 30 is transferred to the pole body 10a.

The ventilation hole 13 is a hole formed so as to penetrate from the outside of the pole body 10a to the internal space 15a. The ventilation hole 13 is a hole different from a minute hole such as a screw hole through which air does not substantially enter or exit. The ventilation hole 13 opens on the outer surface (specifically, the outer surface 101a) of the pole body 10a. The ventilation hole 13 is formed at a position facing the housing 22a in the pole body 10a, that is, at a position where the pole body 10a and the housing 22a contact each other in the pole body 10a. The ventilation hole 13 is located below the position where the device 30 is attached. In addition, the ventilation hole 13 is connected to the internal space 28 of the housing 22a via the ventilation hole 25 described later. In other words, the internal space 15a of the pole body 10a and the internal space 28 of the housing 22a are connected via the ventilation hole 13 and the ventilation hole 25. In addition, the ventilation hole 13 may be located above the position where the device 30 is attached, as long as the internal space 15a and the internal space 28 can be connected by adjusting the position of the ventilation hole 25, etc.

The opening shape of the ventilation hole 13 is not particularly limited, and may be, for example, a polygon such as a rectangle, a circle, an ellipse, or a semicircle. The number of ventilation holes 13 may be one or more. When multiple ventilation holes 13 are formed, the multiple ventilation holes 13 are arranged, for example, in the direction in which the pole body 10a is erected (vertical direction). The multiple ventilation holes 13 may be formed so as to sandwich the position where the equipment 30 is attached. The opening area of the ventilation hole 13 is not particularly limited, so long as it is large enough to generate an air flow, which will be described in detail later.

For example, a cable 35 connected to the equipment 30 is inserted through the ventilation hole 13. The cable 35 is also inserted through the ventilation hole 25 described below. In this modified example, the cable 35 is connected to an underground power line (not shown) or the like. Note that the cable 35 may be connected to the equipment 30 by passing through the pole body 10a and the housing 22a, as in the embodiment. The cable 35 may also be inserted through the ventilation hole 11 and connected to a power line or the like installed on an external utility pole, as in the embodiment.

The mounting member 20a, like the mounting member 20, is a frame for mounting the device 30 to the outer surface 101a of the pole body 10a. The mounting member 20a has a fixing band 21 and a housing 22a.

The housing 22a is a container in which the device 30 is housed. The housing 22a has a configuration similar to that of the housing 22, with the ventilation holes 25 and 26 formed in the container. The housing 22a is fixed to the pole body 10a by a fixing band 21. The housing 22a is in contact with the outer surface 101a of the lower end side of the pole body 10a. The housing 22a includes a flat plate portion 23a that constitutes the pole body 10a side of the housing 22a. The device 30 is fixed to the flat plate portion 23a. The flat plate portion 23a of the housing 22a is in contact with the outer surface 101a of the pole body 10a.

The air vent 25 is formed on the pole body 10a side of the housing 22a, i.e., on the flat plate portion 23a, and is a hole that penetrates the flat plate portion 23a. The air vent 25 is located below the position where the device 30 is attached. When viewed in the direction in which the air vent 25 penetrates, the air vent 25 overlaps with the air vent 13 and is connected to the air vent 13.

The ventilation hole 26 is formed on the opposite side of the housing 22a to the pole body 10a. In other words, the ventilation hole 26 is formed to open on the surface of the housing 22a facing the flat plate portion 23a (i.e., the surface opposite the flat plate portion 23a of the device 30). The ventilation hole 26 is a hole formed to penetrate from the outside of the housing 22a to the internal space 28. The ventilation hole 26 may be formed to open on any surface of the housing 22a as long as it is located in a position where outside air can enter the housing 22a. For example, the ventilation hole 26 may be formed to open on a surface of the housing 22a that intersects with the flat plate portion 23a. The ventilation hole 26 may also be formed to open on multiple surfaces of the housing 22a.

The ventilation hole 26 is located, for example, above the position where the device 30 is attached. The ventilation hole 26 and the ventilation hole 25 (the ventilation hole 13 arranged to be connected to the ventilation hole 25) are arranged, for example, so as to sandwich at least a part of the device 30. As a result, the air entering from the ventilation hole 26 flows along the device 30, passes through the ventilation hole 25 and the ventilation hole 13, and enters the internal space 15a. Note that the ventilation hole 26 is located below the device 30, and the ventilation hole 13 and the ventilation hole 25 are located above the device 30, so that the ventilation hole 26 and the ventilation hole 25 (the ventilation hole 13 arranged to be connected to the ventilation hole 25) may be arranged to sandwich the device 30. Also, a plurality of ventilation holes 26 may be provided along the device 30.

The ventilation holes 25 and 26 are different from tiny holes such as screw holes through which air does not actually flow in or out. The ventilation holes 25 and 26 open on the outer surface of the housing 22a. The opening shape of the ventilation holes 25 and 26 is not particularly limited, and may be, for example, a polygon such as a rectangle, a circle, an ellipse, or a semicircle. The number of the ventilation holes 25 and 26 may be one or more. The opening area of the ventilation holes 25 and 26 is not particularly limited as long as it is large enough to generate an air flow, which will be described in detail later.

In addition, a rain cover 40 is provided on the housing 22a to cover the outside and upper side of the ventilation hole 26 in the housing 22a.

Next, an example of the air flow in the pole 1a according to this modified example will be described with reference to FIG. 4. In FIG. 4, the arrows indicate the air flow when the device 30 is generating heat.

When power is supplied to the equipment 30, the equipment 30 generates heat. As in the embodiment, the equipment 30 is attached to the outer surface 101a of the pole body 10a via the attachment member 20a, so the heat of the equipment 30 is transferred to the pole body 10a by the attachment member 20a (more specifically, by heat conduction via the attachment member 20a). The air in the internal space 28 warmed by the heat of the equipment 30 expands and enters the internal space 15a of the pole body 10a through the air vents 25 and 13, so that the heat of the equipment 30 is also transferred to the pole body 10a. As a result, the air in the internal space 15a of the pole body 10a near the position where the equipment 30 is attached is warmed and becomes lighter in density, so that air convection occurs in the internal space 15a. In the internal space 15a, the heated air rises and is discharged to the outside through the ventilation hole 11, while the air in the internal space 28 is drawn into the internal space 15a through the ventilation hole 25 and the ventilation hole 13. At the same time, outside air is drawn into the internal space 28 through the ventilation hole 26. This allows moisture that has accumulated in the internal space 15a to be released to the outside, as in the embodiment. This prevents the pole body 10a from corroding due to moisture.

In this way, in the pole 1a, the heat of the equipment 30 is also transferred to the pole body 10a by the air heated in the internal space 28 of the housing 22a flowing into the internal space 15a of the pole body 10a, so that the heat is efficiently transferred to the pole body 10a. In the internal space 28, air flows from the air vent 26 toward the air vent 25. In this case, the air vent 26 and the air vent 25 (the air vent 13 arranged to be connected to the air vent 25) are arranged to sandwich the equipment 30, so that air flows along the equipment 30 in the internal space 28, and the heat of the equipment 30 is transferred more efficiently. Therefore, a flow path for heating the air is formed in the housing 22a provided on the outside of the pole body 10a, and the air heated in the flow path flows into the internal space 15a, so that the diameter of the pole body 10a can be reduced while efficiently discharging the moisture accumulated in the internal space 15a. In addition, the outside air taken in through the ventilation holes 26 flows along the equipment 30 in the internal space 28, thereby efficiently cooling the equipment 30.

The air flow in the pole 1a is not limited to the example described above. Depending on the temperatures of the internal space 15a and the internal space 28, the amount of heat generated by the device 30, the relative positions of the components, and the size of the components, an air flow different from the example described above may occur.

For example, an upward air current may occur in the internal space 28 due to the balance of the amount of air passing through the ventilation holes 26, 25, and 13, as well as the state of heat transfer of the equipment 30. In this case, the air in the internal space 28 is exhausted from the ventilation hole 26, and the air in the internal space 15a is drawn into the internal space 28 through the ventilation holes 25 and 13. At the same time, outside air is drawn into the internal space 15a through the ventilation hole 11. In other words, an air flow in the opposite direction to the arrow shown in FIG. 4 may occur. In this case, outside air is also drawn into the internal space 15a, and the air in the internal space 15a containing moisture is exhausted to the outside through the ventilation holes 25, 13, and 26. Therefore, the pole body 10a is prevented from corroding due to moisture.

Other Embodiments
Although the embodiment and the modified examples of the embodiment have been described above, the present invention is not limited to the above-described embodiment and the modified examples of the embodiment.

In the above embodiment, the poles 1 and 1a are equipped with the lighting fixtures 50, but this is not limited to the above. The poles 1 and 1a do not need to be equipped with the lighting fixtures 50, and may be poles for supporting, for example, a sign, a signboard, an antenna, a flag, or the like.

In the above embodiment, the ventilation hole 11 is formed to open on the outer surface 101, 101a of the pole body 10, 10a, but this is not limited to the above. For example, the ventilation hole 11 may be formed to open on the upper end of the pole body 10, 10a. In this case, the upper end of the pole body 10, 10a may be completely open, or a part of the upper end surface of the pole body 10, 10a may be open. In this case, a rain cover may be provided to cover the upper end of the pole body 10, 10a from above.

In the above embodiment, the device 30 is an electronic device, but this is not limited to this. The device 30 may be a heat-generating device such as a heater.

In the above embodiment, the device 30 is housed in the housing 22, 22a, but this is not limited to the above. For example, the device 30 may be fixed and attached so that the device 30 is in direct contact with the pole body 10, 10a by a member such as the fixing band 21 that fixes the device 30 to the pole body 10, 10a. In this case, in order to protect the device 30, the fixing band 21, the device 30, and the portion of the pole body 10, 10a to which the device 30 is attached may be surrounded by a housing or the like. The device may also be fixed to the pole body 10, 10a by a member other than the fixing band 21.

In addition, in the above embodiment, the pole 1, 1a may further include a fan for discharging air from the internal space 15, 15a through the ventilation hole 11.

In the above embodiment, the lower end of the pole body 10, 10a is buried in the ground 70, but this is not limited to the above. A plate-shaped anchor plate larger than the cross section of the pole body 10, 10a may be provided at the lower end of the pole body 10, 10a, and the anchor plate may be fixed with an anchor bolt.

In the above embodiment, the cable 35 passes through the internal spaces 15, 15a and is connected to the device 30, but this is not limited to the above. The cable 35 may be connected to the device 30 by passing through the housings 22, 22a without passing through the internal spaces 15, 15a.

In addition, the present invention also includes forms obtained by applying various modifications conceivable by a person skilled in the art to each embodiment and modification, or forms realized by arbitrarily combining the components and functions of each embodiment within the scope of the spirit of the present invention.

1, 1a Pole 10, 10a Pole body 11, 12, 13, 25, 26 Ventilation hole 20, 20a Mounting member 30 Equipment 35 Cable 50 Lighting fixture 101, 101a, 221 Outer surface

Claims (8)

A cylindrical pole body on whose outer surface a heat-generating device is attached ;
A housing for housing the device,
The pole body is provided with a first air vent located above the position where the device is attached and connecting the internal space of the pole body with the outside air , and a second air vent located below the first air vent and connecting the internal space of the pole body with the internal space of the housing ,
The housing has a third ventilation hole formed therein, the third ventilation hole connecting an internal space of the housing with the outside air.
pole. the second vent hole is located below a position where the device is attached;
The third ventilation hole is located above a position where the device is attached.
The pole according to claim 1. A cable connected to the device is inserted through the first ventilation hole or the second ventilation hole .
A pole as claimed in claim 1 or 2. The device is an electronic device having a power semiconductor.
A pole according to any one of claims 1 to 3. The electronic device is a wireless communication device.
A pole as claimed in claim 4. The pole body is made of metal.
A pole according to any one of claims 1 to 5. The device further comprises:
A pole according to any one of claims 1 to 6. Further comprising a lighting fixture supported by the pole body.
A pole according to any one of claims 1 to 7.

Images