JPH039367Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pole leg device suitable for use when, for example, an antenna support pole equipped with a television broadcast receiving antenna is installed on a roof or the like.

2. Description of the Related Art Conventionally, pole leg devices have been used, for example, when an antenna support pole or the like is erected on a roof or the like. This is because the antenna support pole cannot be erected as it is because the roof is generally not flat, the antenna support pole must be erected without modifying the roof or other structure, and the antenna support pole cannot be erected because the roof or other structure is not flat. It is also used for reasons such as not causing damage to structures such as roofs.

This pole leg device is what is called a roof horse, and various structures are provided. A typical structure of this conventional pole leg device is as shown in, for example, Japanese Utility Model Publication No. 52-28421. That is, a conventional example of a pole leg device will be explained with reference to FIGS. 1 and 2. The structure of this pole leg device is as follows.
A pedestal 2 having an insertion hole 1, leg support brackets 3 provided on all sides of this pedestal 2, and this bracket 3.
support legs 5 each pivoted by a pin 4 to
It consists of a stopper 6 provided by diagonally cutting the pivot portion of the support leg 5, a cylindrical body 7 that guides and fixes the support pole, and a stopper 8 cut and raised inside the lower end of this cylindrical body 7. ing.

The pole leg device having the above structure had the following disadvantages.

First, the shape of the bracket 3 is complicated, and when forming it from a flat plate by drawing, it is difficult to freely select the thickness and material.In addition, the bracket 3 is distorted by forming.
Another problem is that there are locations where the material thickness changes.

Second, as shown in Fig. 1, this bracket 3 is fixed by spot welding to the cylindrical body 7 or the pedestal 2 that receives the support pole between the respective leg pivot parts, and when in use, the support leg 5, the legs are spread apart, so a load is constantly applied to the leg pivot in the direction of the legs being spread. As a result, there was a problem in that the spot portion was likely to be rolled up.

Third, during use, pole leg devices are not only exposed to wind and rain, but also salt water, corrosive gases, and even snow and ice, which often deteriorate the strength of the material. This causes a significant deterioration in strength at places where there are distortions or flaws, such as spot welds. This is a major problem in the conventional example because it cannot be compensated for by painting or the like.

Fourthly, due to its structure, the pole leg device 9 is
There are disadvantages to the roof 10, such as a large ridge tile roof as shown in the figure, as follows. In the figure, reference numeral 11 is a support pole, 12 is a stay, and 13 is an antenna. That is, support poles 1 are attached to these large roofs 10.
1 on each leg 5 in order to be able to attach
must be bent in the middle, as shown in Figure 3. Further, as a means to further prevent twisting of the legs 5, usually the leg pivot span and accompanying bracket 3 are increased in size, or the legs 5 are
It was necessary to take measures such as significantly increasing the length and height. For this reason, consideration must be given to increasing the strength of the members of the legs 5 themselves, which increases the weight of the members used and increases costs.

Fifth, although the upper part of the leg 5 is covered by the bracket 3, if pipe material is used for the leg 5, rainwater may seep into the inside of the leg 5, and it is extremely difficult to prevent this. It was. As a result, leg 5
Another problem was that corrosion occurred from inside the members.

Sixthly, since the above-mentioned load is also applied to the center cylindrical body 7, deformation of this cylindrical body 7 is likely to occur, and reinforcing materials such as screws, nuts, or rivets are required to prevent this, which is an inconvenience. It was hot. In particular, this reinforcement resulted in a reduction in the holding length of the support poles of the central cylinder 7 due to the necessity of cruciform arrangement. As a result, it became necessary to further increase the length of the central cylinder 7.

Seventh, these legs 5 are designed to be able to rotate inward and be stored in a small size during transportation, but when actually used, it is natural if the legs 5 of the pole leg device 9 are lifted from the surface of the device even a little. This caused the inconvenience of being extremely difficult to work with as it rotated inward. As a result, bracket 3 near the central
Protrusions were provided on the inner surface to make it difficult for the legs 5 to return once they were opened. This results in the peeling off of the coating on the surface of the legs 5 when the legs 5 are rotated to open the legs, resulting in problems such as corrosion progressing from this area.

Eighth, since the four legs 5 and the bracket 3 are rotatable relative to each other, there is a problem that the pole leg device as a whole is slightly deformed.

This invention was made in view of the above points,
A plurality of legs formed in a substantially U-shape are overlapped in a substantially cross-shape in the center and fixed together with a receiving plate, and a cylindrical body for fixing the pole is provided on this receiving plate, increasing its mechanical strength. It is an object of the present invention to provide a leg device for a pole that is easy to use, has improved durability, is easy to use, and has a reduced number of parts and assembly man-hours.

An embodiment of the present invention will be described below based on FIG. 4 and subsequent figures.

FIG. 4 is a side view showing a pole leg device according to an embodiment of the present invention, and FIG. 5 is a sectional view of a main part of FIG. 4. FIG. 6 is a perspective view showing a receiving plate used in the pole leg device of the present invention.

In these figures, the pole leg device 20 is
The substantially central portions of the two legs 21, 21 formed in a substantially U-shape are made flat, and these flat portions 22, 2
2 are placed one on top of the other, and the screws 25 are inserted into the through holes 24, 24, 24 drilled therein together with the receiving plate 23.
These legs 21, 21 and the receiving plate 23 are screwed together, and the cut-out 26 provided on the receiving plate 23 is fixed to a cylinder 27 that guides and fixes the pole, so that the cylinder 27 is attached to the receiving plate 2.
It is configured to be installed vertically at 3.

Since the outer periphery of the leg 21 in this receiving plate 23 is circular, circular grooves 28, 28 are formed to ensure reliable contact with this outer periphery. Furthermore, the legs 21 are
As mentioned above, it is formed in a U-shape, and a flat part 22 of a predetermined width is provided at the center thereof. When this flat part 22 is formed of a cylindrical pipe, the receiving plate 22 is
It is preferable to form it flat toward the side that contacts 3.

Further, the cylindrical body 27 is provided with a screw 30 for fixing the pole 29.

How to use the pole leg device 20 configured as described above will be explained below.

FIG. 7 is a side view showing the shape of the pole leg device 20 of the present invention when it is transported, etc. As shown in this figure, when transporting etc., use the four legs 2.
1 and 21 are bent inward.

When using this, the shape as shown in FIG. 4 is obtained by simply opening the four legs 21, 21 in the direction of arrow P shown in FIG. 7, that is, outward. Therefore, it is used in this state (as shown in FIG. 4).

By the way, since bending or opening the legs 21, 21 in this manner means completely plastically deforming the legs 21, it is not desirable to repeat opening and bending the legs indefinitely. However, although it depends on the material of the leg 21, it can withstand repeated use several times, and there is no practical problem. Moreover, U-shaped legs 21, 21
The part formed by overlapping the flat parts 22, 22 has a planar shape and is firmly fixed to the receiving plate 23, so that it functions to prevent mutual twisting. Furthermore, since this flat portion 22 is only the overlapped portion, and the other portions are cylindrical pipes, even if this portion is subjected to twisting action, it can sufficiently withstand it.

In addition, since it is composed of two legs 21, 21, the opposing legs 21, 21 are connected to each other in a substantially straight line, and the torsion is directly transmitted to the opposing legs 21, so that the twisting occurs in opposite directions. It's going to get twisted. As a result, the torsional strength of the pipe section is lower due to the fact that the lever principle is not applied to the flat sections 22, 22, and that the width of the area that is made flat with the pipe is necessarily larger than that of the pipe section. It is not inferior in strength. Therefore, there is no need to prevent the legs 21 from twisting with a large span as in the prior art, and the strength of the pivot itself is improved.

In addition, since the receiving plate 23 can be a relatively flat plate, the plate thickness, material, etc. can be freely selected.
This makes the strength of the receiving plate 23 strong.

By the way, the load strength when the pole 29 is fixed to the pole leg device 20 is determined by the surface pressure strength between the receiving plate 23 and the flat part 22 of the leg 21. In the present invention, grooves 28 are provided in the receiving plate 23, and through holes 24 are provided in the flat parts 22 of the receiving plate 23 and the legs 21.
Since the contact surfaces are in very good condition, the load strength can be very high. Furthermore, in addition to being able to select the shape, wall thickness, structure, etc. of the pipe of the leg 21 quite freely,
Since there are no restrictions on the shape etc. of No. 3, the loading strength can be increased.

By the way, regarding the strength of this flat part 22, see
This will be explained with reference to the figures.

Assume now that the cylindrical body 27 is receiving a force F downward from the pole 29 as shown in the figure, and is also receiving a moment M. This moment M
is decomposed into forces centered on the end of the receiving plate 23. That is, as shown in the figure, the distances are l ₁ , l ₂ , l ₃ , the forces F ₁ , F ₂ , F ₄ and the tensile force T ₁ , and the cylindrical body 27
If the diameter of is D, then M is given by the following equation.

M≒ΣT ₁ l ₁ …(1) M≒ΣF ₁ l ₂ …(2) M≒ΣF ₂ l ₂ +F ₄ D …(3) Furthermore, the force R and force F acting upward on the lower part of the leg 21 The relationship with is F=ΣR...(4).

In this way, even if the force F etc. is applied, most of it is converted into tensile force in the flat part 22, so it becomes strong in terms of strength. Furthermore, a moment will be generated in the receiving plate 23 as a reaction force, but since the mechanical strength of the receiving plate 23 is large, sufficient strength should be provided in conjunction with the strength of the pipe of the leg 21 itself. It is something that can be done.

In addition, the cutouts 26, 26, 2 provided on the receiving plate 23
When 6, 26 are spot welded to the cylinder body 27, force is transmitted to the spot welds so as to always press the cylinder body 27, so the strength of the central part of the receiving plate 23 does not need to be very large. Furthermore, this receiving plate 2
Reference numeral 3 constitutes the bottom portion of the cylindrical body 27, and the holes formed by forming the cut and raised portions 26 to 26 can be used as rainwater drainage ports. Therefore, it has the advantage of not being corroded by rainwater, and its durability is significantly improved.

In addition, the substantially U-shaped legs 21 are extremely convenient when used on large roofs, and in addition to not requiring the entire structure to be so large as in the past, they are more resistant to external forces than before. This has the advantage that there is no need to construct the legs 21 with a large span as shown in the figure, and the length of the legs 21 can be shortened, resulting in a significant cost reduction.

In addition, if you loosen the screw 25 and use it, the leg 21
Since the degree of opening of the roof is significantly increased, the range of use is expanded, and by performing a simple operation of slightly changing the intersecting angle of the two legs 21, 21, the roof can be used for larger roofs.

As described above, according to the present invention, a plurality of legs formed in a U-shape are fixed together with a receiving plate in a substantially cross shape at the center thereof, and a cylindrical body for fixing the pole is attached to this receiving plate. Since it is provided, it has the advantage of high mechanical strength, and in addition, it has the advantage of reducing the number of parts and assembly man-hours, and is easy to use.

[Brief explanation of drawings]

Figure 1 is a perspective view showing a conventional example, and Figure 2 is a perspective view of a conventional example.
3 is an explanatory view showing an example of the use of a pole leg device, FIG. 4 is a side view showing a pole leg device according to an embodiment of the present invention, and FIG. 5 is a sectional view with some of the figures omitted. Fig. 4 is a cross-sectional view of the main parts, Fig. 6 is a perspective view showing the receiving plate, Fig. 7 is a side view showing the state of the pole leg device of the present invention during transportation, etc., and Fig. 8 is a cross-sectional view of the pole leg device of the present invention. It is an explanatory view shown in order to explain the relationship of moments, etc. of a leg device for poles. 21... Leg, 22... Flat part, 23... Receiver plate,
27... Cylindrical body.

Claims (1)

[Claims for Utility Model Registration] A pipe body is formed into a substantially U-shape, and a plurality of legs are combined in a cross shape by providing a flat part that can be plastically deformed in the center thereof, and preventing the plastic deformation of the legs. A pole leg device comprising: a receiving plate provided with a means for fixing the pole; and a cylindrical body for fixing the pole attached to the receiving plate.