JPS5818220Y2 - Structure of antenna feed box - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a power feeding box that houses electronic circuit components inside and is provided close to an antenna.

This invention lowers the unit manufacturing cost, and even with a structure that can reduce the cost, when a coaxial cable for a power feed line is inserted into a box, the braid constituting the outer conductor is less likely to curl up. It is an object of the present invention to provide a structure of an antenna feed box that can be inserted into the antenna, and the feed line can be installed very easily.

The drawings showing the embodiments of the present application will be described below.

1 is an antenna (radiator) composed of elements 1' and 1' protruding from both sides of the power feeding section 20 as is generally known, and 3 is a feeding box in the feeding section 2, which is a holding section. 4',... element 1/, 1/
A container-shaped main body 4 with an upper opening that holds and fixes the base of the
and a lid 5 (see Fig. 5) which is attached from above, and has a space inside which can accommodate a conversion transformer 6 for a well-known balun, etc., which is an example of an electronic circuit component. There is.

In the box, 7 and 7 are Niremen respectively) 1', 1
The power supply terminal metal fittings electrically connected to one end of the ' are shown, and as is well known, these are electrically connected to the coaxial cable connecting member provided in the power supply line attachment part 9 via the transformer 6. It is connected.

8 indicates the well-known trap connecting between the other ends of the elements 1', 1'.

Incidentally, the main body 4 and the lid 5 are usually integrally molded using a plastic material.

Further, 4'' shown in FIG. 3 indicates a female screw hole used when fixing the power supply box 3 to the boom as is well known.

Next, the power supply line attachment portion 9 will be explained in detail.

10 is the bottom part 4 of the box body 4 as shown in FIG.
' is a small through-hole for inserting the feeder line, which is passed through the hole-forming tree part 11 that is integrally formed with the main body 4, so that the hole wire 10' in the box is connected to the upper opening surface of the main body 4. It is formed to be open.

The diameter of the hole is approximately the same as or slightly larger than the outer diameter of the coaxial cable to be inserted.

Reference numeral 12 denotes a feeder attachment wall 14, 1 that is integrally formed and stands up from a part of the hole edge 10' in parallel with the flower core 13 of the small through hole 10.
Reference numeral 5 indicates a connecting tool for connecting the core wire of a coaxial cable and a conductor for attaching an external conductor, which are located above and below the surface of the attached wall 12 on the flower core 13 side, respectively.

As clearly shown in FIG. 7, the connection device 14 is a conductive device in which insertion pieces 16', 16' provided at both ends of the connection device 14 are inserted into the holes 12a, 12a of the attached wall 12 so as to freely extend and retract in the direction of the arrow. It consists of a connecting plate 16 made of (metal) material, and a screw 17 that passes through the plate and is screwed into the attached wall 12 so that the connecting plate 16 can be pressed against the wall surface, and the screw 17 is screwed into the attached wall 12. Piece 1
A 6% lead wire from the transformer 6 is connected and fixed to the free end of the transformer 6'.

Further, the connection plate 16 is attached to the attached wall 12 at a position 1 such that the core wire of the coaxial cable can be easily inserted between itself and the attached wall 12.
It is configured so that it can be separated from the

On the other hand, the conductor 1 is made of the same material as the connection plate 16.
Reference numeral 5 is configured for grounding, and as shown in FIG. The adhesion wall 12 is formed into a recess and is located embedded in the recess 18.

Further, as shown in FIG. 4, the conductor 15 has insertion pieces is', is' provided at both ends of the conductor 15 in the hole 12b of the attachment wall 12 in the recessed portion 18.

12b, the free end of one plug-in piece 15' is bent to fix itself, and the free end of the other plug-in piece 15' is twisted and connected there to the grounding wire from the transformer 6. The lead wire 6'' is connected and fixed.

Reference numerals 19 and 19 are regulating pieces established from the attached wall 12, and the core wire of the coaxial cable is inserted between these pieces to regulate the insertion position of the coaxial cable with respect to the connector 14.

Next, reference numeral 20 denotes a holding device for fixing the feeder line, which is positioned opposite to the conductor 15, and the screws 21 and 21, which pass through both ends of the holding device and are screwed into the attachment walls 12 on both sides of the conductor 15, rotate. This allows the conductor 15 to be operated near and far.

Further, the length of the screws 21 and 21 is set to a sufficient length so that the presser 20 can be separated at a position 1 where it does not projectively overlap the small through hole 10, as shown in FIG.

Note that 22.22 indicates a spring that constantly urges the presser 20 in the direction of separation.

In the above configuration, a case where the coaxial cable 24 used as a power supply line is fixed to the power supply line attachment part 9 will be explained.

First, the connection plate 16 and the presser 20 of the connection tool 14 are set in advance in a state where they are sufficiently separated from the attached wall 12 at the position 1 as described above.

(See FIG. 4.) Then, as shown in FIG. 3, a coaxial cable 24 whose tip is stepped is inserted from below into the small through hole 10 of the bottom portion 4'.

In this inserted state, the coaxial cable 240 braid 26 (
The external conductor (external conductor) is guided by the inner wall surface of the small through hole 10 and smoothly moves upward from the tip without coming undone.

Eventually, the tip of the coaxial cable 24 is exposed from the small through hole 10, as shown in FIG.

Even in this case, since the conductor 15 is located within the recess 18 and the presser tool 20 is sufficiently separated as described above, the braid 2
6 is not obstructed in any way (does not get caught and unraveled), and the coaxial cable 24 is further guided by the presence of the attachment wall 12.

In this way, the core wire 25 at the tip of the coaxial cable 24 is easily inserted between the connecting plate 16 and the attachment wall 12 of the core wire connector via the regulating pieces 19 and 19 without any obstruction. reaches the side surface (abutting surface) of the conductor 15.

In this state, as shown in FIG. 5, the screw 1T is tightened to fix the core wire 25 and the connecting plate 16
By tightening the screws 21 and 21 and moving the presser 20, the braid 26 is brought into pressure contact with the conductor 15, mechanically fixing the coaxial cable 24 and electrically connecting the braid 26 to the conductor 15. A similar connection will be made.

After that, the lid body 5 is screwed onto the threaded portion 4# on the open outer periphery of the main body 4, and a waterproof cap (not shown), which has been attached to the coaxial cable in advance in a well-known manner, is inserted around the small through hole 10. Waterproofing is achieved by fitting into an annular recess 27 provided in the.

In addition, when using a well-known parallel feeder as a feed line,
The parallel feeder is inserted into the small through hole 10 in the same way as the coaxial cable by using parallel feeder guiding grooves 28 and 28 provided opposite to each other on the inner wall of the small through hole 10.

After insertion, the two conductors at the ends which were exposed in advance and which protrude largely from the hole edge 10' are connected and fixed to the main power supply terminal fitting 7.7 using the tightening screws 7' and 7' provided thereon. .

In addition, in the power supply line fixing section 9, the parallel feeder is clamped and fixed to the attachment wall 12 using the holding tool 20 in the same manner as described above.

As described above, in this invention, a small through hole 10 for coaxial cable insertion is provided in the bottom 4' of the power feed box 3, and an upright feeder is provided parallel to the flower core 13 of the small through hole 10. The wire attaching wall 12 is formed integrally with the box body 4, and on the upper and lower sides of the attaching wall 12 facing the flower core 13, a core wire connector 14 and a conductor 15 for attaching the outer conductor of the coaxial cable are provided. Furthermore, since the conductor 15 is embedded in the recess 18 previously formed in the attached wall 12 near the hole edge 10', the tip is stepped as shown in FIG. Even when the coaxial cable 24 in which the braid 26 is easily unraveled is inserted into the small through hole 10 from below, the above braid 26 is guided by the inner wall surface of the small through hole 10 and moves upward without unraveling. Not only can it be moved, but also when exposed upward from the small through hole 10, the upright attached wall 12
There is an advantage that the core wire 25 provided at the tip can be further guided by the presence of the core wire connector 14 to reach the core wire connector 14 in one go.

In this case, as a matter of course, there is an effect that the braid 26 itself can reach the side surface of the conductor 15 without any hindrance.

Furthermore, in this state, the holding tool 20 can be moved away from or near the conductor 15, so by fixing it close to the conductor 15, the outer conductor 26 of the coaxial cable can be mechanically attached to the conductor 15. There is also the convenience of being able to fasten (connect) this by pressing it together.

Moreover, since the conductor 15 is embedded in the concave portion 18, even if a large pulling force is applied to the coaxial cable 24 when the coaxial cable 24 is fixed by the presser 20 as described above, it will not embed in the recess 18. shaped conductor 150 surface and small through hole 1
The stepped portion between the inner surface of the 0 and the inner surface provides a large resistance to the above-mentioned pulling force, and has the effect of firmly maintaining the above-mentioned fixed state.

Furthermore, in the present invention, as described above, the main body 4 and the attachment wall 12
Since they are integrally formed, there is an advantage that the attached wall 12 can be formed at almost no cost during manufacture, and there is a practical advantage that the number of parts is small and the molding cost is low.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. 1 is a plan view showing the power supply box with the lid removed, Fig. 2 is a perspective view of the main part, and Fig. 3 is Fig. 1 showing the main part exploded. 1Il-■ cross-sectional view of 4th
5 and 5 are partially enlarged sectional views for explaining the installation of the power supply line, FIGS. 6 and 7 are sectional views taken along lines Vl-VI and ■-■ in FIG. 4, respectively, and FIG. Partial view of the small through hole for inserting electric wires, viewed from below, 3...Power supply box, 4...Main body, 4'...
...Bottom, 10...Small through hole, 12...
・・Feeder attachment wall, 14・・Connector for core wire connection, 15・・Conductor for attaching external conductor, 18・
...-concave portion, 20...presser.

Claims (1)

[Scope of utility model registration request] The antenna feed box consists of a main body and a lid, and has a space inside which can accommodate electronic circuit components.The main body is molded from an insulating plastic material and has a small through hole at the bottom to allow the feed wire to pass through. On the other hand, inside the power supply box, a power supply line attaching wall is provided that stands up from the edge of the small through hole in a direction parallel to the flower core by means of integral molding with the power supply box body, and On the side of the attached wall facing the flower core, a connecting tool for the core wire fixing material to which the electronic circuit provided in the box is connected, and a conductor for attaching the external conductor are arranged separately above and below. The conductor is embedded in a recess formed at a position closer to the edge of the hole than the connector, and the conductor is provided with the flower core in between. A presser is disposed at a position facing the conductor so that it can be moved freely toward and from the conductor. A structure of an antenna feeding box characterized in that it can be placed at any position.