JPH0349450Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cover for a power feeding part of a high-power antenna, and particularly to a cover that has a high protection function for the power feeding part and is excellent in terms of manufacturing, assemblability, and cost.

[Conventional technology and its problems]

Generally, the power feeding part of the antenna is often covered with a resin cover for the purpose of snow, dust, and corrosion prevention.In addition, this cover is made of matrix resin and polyester from the viewpoints of durability, strength, and economy. Alternatively, FRP (fiber-reinforced plastic) made of epoxy is often used.

By the way, the key to determining the performance of the cover of the antenna feeding section is how the structure of the part where the two wires pass through the pair of element traps is designed.

For example, a well-known low-power power supply cover is usually molded in multiple pieces, as shown in Figure 4.
Each divided member of the FRP case 1 is provided with a connecting flange 2 that butts against each other, and the edge portion with this flange is formed into a semicircular concave shape 3 at the element trap A portion, and between the opposing concave portions. It is said that the structure is designed to sandwich the element trap, but this structure is
Rainwater tends to collect in the flange between the pair of element traps, and since the end face of the flange is open to the outside, the laminated part of the reinforcing fibers tends to absorb water due to deterioration of the FRP. If used for high power applications, burnout accidents may occur due to sparks.

Therefore, as a countermeasure against sparks, in the power feed section cover for high power, the part where the element traps are sandwiched is made into one continuous concave shape 3', and the concave area on the outer surface of the flange between the pair of element traps is At the same time, the spacer 4 made of tetrafluoride resin or trifluoride resin is bolted and installed inside the case 1, and the element trap A is passed through a notch or hole provided independently in this spacer. A method is used to insulate between the traps.

However, even in this structure, since there is a flange 2 between the element traps, water that causes sparks may accumulate or be contained there.

Furthermore, since the insulating spacers are bolted, assembly and disassembly are time-consuming, and the number of man-hours required for machining the spacers and the case increases due to the machining of bolt holes.

Furthermore, in addition to the increase in manufacturing man-hours, the entire case opening must be covered with insulating spacers as shown in the figure.
Attaching bolted portions to the spacer also increases the amount of expensive spacer material used, thus increasing product cost.

This invention was devised for the purpose of eliminating these problems.

[Means for solving problems]

In order to eliminate the above problem, this invention provides two circular insulating spacers interposed between a pair of element traps at the joint of a plurality of split molded FRP (fiber reinforced plastic) cases. Insert and hold the arc-shaped edge provided corresponding to the split FRP case into the groove, and insert the arc-shaped edge provided on the outer periphery of this spacer and the opposing part into the joint of the split FRP case. In combination with the provided semicircular groove, an insertion hole for the element trap is formed.
Furthermore, the division excluding the insertion part into the above insulating spacer
A flange is provided on the edge of the FRP case to connect the divided cases.

That is, by removing the flange on the case joint edge between the pair of element traps where the insulating spacer is present, it is possible to eliminate the accumulation of rainwater on the outer surface of the case and the infiltration of water into the reinforcing fiber layer, which can cause sparks. By making the insulating spacer circular and holding it by fitting it into the case, the process of machining bolt holes and tightening and removing bolts during assembly and disassembly can be omitted, and the spacer dimensions can be kept to the minimum required size. The feature of the present invention is that it eliminates wastage of expensive materials.

〔Example〕

Hereinafter, an embodiment of this invention will be described based on the attached FIGS. 1 to 3.

The illustrated power supply unit cover 10 pulls out the element trap A in three directions: top, bottom, and sides.
The FRP case 11 is a member 11 that is molded into three parts along a line connecting the axes of the pair of element traps.
A, 11b, and 11c are combined into one case.

The members 11a and 11b are symmetrical, and a pair of transverse element traps are pulled out from the joint between them. Moreover, the member 11c is the member 11 of the joint part.
It has a shape that collectively covers the open ends of the members 11c and 11a, 11c and 11b.
The upward and downward element traps are pulled out from each joint of b.

Each member 11a, 1 between a pair of element traps
The edges 12 (Fig. 2) of 1b and 11c have a concave shape that follows a circle based on the center of the line connecting the axes of the pair of element traps, and the remaining edges other than these areas are each provided with a flange. 13 is attached. The ends of each flange 13 are all formed into a 1/4 circle concave shape. Therefore, when two members are joined together, a half circle along the 1/4 circle flange is formed at the joint of the two members. A circular groove 14a is formed.

The insertion hole 14 of the element trap A is inserted into the semicircular groove 1 described above.
4a and one of a pair of semicircular grooves 15a provided on the outer periphery of the circular insulating spacer 15 at positions shifted by 180 degrees.

The insulating spacer 15 made of tetrafluoride resin or trifluoride resin is attached to the case 11 between a pair of element traps, and has a groove 15b on the outer periphery excluding the semicircular groove 14b, and the above-mentioned groove is formed in this groove. Member 11
The edges 12 of a, 11b, and 11c are inserted and supported by the case. This is a so-called fit-in spacer. This spacer does not require a bolted part and only needs to be large enough to cover the case opening between the axes of the pair of element traps. It is also easy to put on and take off.

Note that the case members 11a, 11 which are separately molded
As shown in FIG. 1, b and 11c may be integrated by joining their respective flanges against each other and bolting or clipping the flange portions.

〔effect〕

As mentioned above, in the power feed section cover of this invention, the flanges attached to the edges of each divided member of the FRP case are removed between the pair of element traps.
Rainwater will not accumulate on the case surface between the element traps where insulation is most required, and there is no fear that water will be trapped between the fibers of the FRP case at that location. Therefore, sparks and burnout accidents caused by them are completely eliminated.

In addition, since the circular insulating spacer is attached to the FRP case by fitting it unevenly, the process of machining bolt holes that required positioning and the process of operating bolts for attaching and detaching the case, which were conventionally necessary, are omitted, and the processability is improved. Improves ease of assembly and disassembly.

Furthermore, in addition to the effect of reducing manufacturing man-hours, the spacer dimensions can be minimized and material costs can be reduced, which is advantageous from an economic point of view.

In addition, since there is no fixing bolt for the insulating spacer, the appearance is also improved.

The cover of this invention can be used to protect the power feeding part of FM and TV twin loop antennas, super gain antennas, frame antennas, and dipole antennas.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the power feed section cover of this invention, Fig. 2 is a partially cutaway side view thereof, Fig. 3 is a perspective view of an insulating spacer, and Fig. 4 is a conventional low power antenna feeder cover. Fig. 5 is a perspective view of a conventional feeder cover for a high power antenna. 10...Power supply unit cover, 11...FRP case,
11a, 11b, 11c... divided member, 12...
Arc-shaped edge, 13... flange, 14... element trap insertion hole, 14a, 15a... semicircular groove, 15
...Insulating spacer, 15b...groove.

Claims (1)

[Scope of utility model registration request] Two circular insulating spacers are provided between the pair of element traps at the joints of the FRP (fiber reinforced plastic) cases that are molded into multiple pieces, and these spacers are provided in grooves on the outer periphery corresponding to the split FRP cases. Insert and hold the arc-shaped edge,
A pair of semicircular grooves provided on the outer periphery of this spacer are combined with an opposing semicircular groove provided at the joint portion of the split FRP case to form an insertion hole for the element trap, and then inserted into the insulating spacer. A feeder cover for a high-power antenna, which consists of a flange for connecting the divided cases to each other on the edge of the divided FRP case, excluding the insertion part.