JPH0210647Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an antenna pole that constitutes the tip of a multi-stage telescoping pole antenna or the like.

[Conventional technology]

Conventionally, it has been known to use a metal pipe as an antenna pole such as the tip pole of a multi-stage telescopic pole antenna, and a decorative bead is generally provided at the tip of the pipe that constitutes the tip of such an antenna pole. ing. As such an antenna pole, a conventionally known antenna pole is one in which a decorative bead leg made of a synthetic resin molded product is inserted into the tip of a pipe, and the leg is caulked and fixed to the tip of the pipe. ing.

[Problems to be solved by the invention] However, with this antenna pole, there were problems in that the decorative balls easily fell out of the pipe and the appearance was not good because the pipe left caulking marks.

Therefore, a metal chip is fitted and fixed to the tip of the pipe, the tip of the chip is made to protrude from the tip of the pipe, and a decorative bead made of synthetic resin is integrally formed on the tip of the pipe and the tip. However, this pipe requires a metal chip and has a large number of parts, and the chip and pipe must be caulked together, requiring many manufacturing steps, resulting in high costs.

The present invention has been made to solve the above-mentioned problems.

are doing.

[Means to solve the problem]

In order to achieve the above object, the antenna pole of the present invention has a rectangular shape in which the inner surface of the pipe constituting the tip of the pole antenna is pressed slightly toward the base side from the tip of the pipe from the outer circumferential side to the center side. , a plastically deformed portion having an irregular cross section such as a star-shaped polygon is formed, and a decorative bead is integrally molded from synthetic resin on the plastically deformed portion of the pipe and the large diameter portion on the distal end side of this deformed portion. It is something.

[Function] With the above configuration, without using separate parts,
To provide a pole antenna at a low cost and to be able to firmly fix a decorative ball to a pipe so that it does not fall out.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 2 denotes the tip pole of the multi-stage telescopic pole antenna 1, and the tip pole 2 is made of a metal pipe 3 with an outer diameter D of 2.8 mm and a wall thickness of 0.2 mm. Then, about 5 mm from the tip of this metal pipe 3 to the base side, as shown in FIGS. The pipe 3 is crushed to form a plastically deformed portion 4 having a cross-shaped polygonal cross section, and the inner surface of this deformed portion 4 is tightly contacted. As shown in FIG. 3, holes 6 with a diameter of 1.5 mmφ are formed at two locations in the circumferential direction at positions of 1.5 mm, as shown in FIG. There is.

Here, as shown in FIG. 1, a decorative bead 7 protrudes from the plastically deformed part 4 of the metal pipe 3 slightly from the base side, covering the outer periphery of the plastically deformed part 4 and the distal end part 5 in the direction in which the distal end of the metal pipe 3 extends. is integrally molded with the metal pipe 3 from a colored synthetic resin, and the decorative beads 7 are filled into the cup-shaped tip end 5 and the outer circumferential groove of the plastically deformed part 4. The outer diameter of this decorative ball 7 is 7.
mm, and the length is approximately 10 mm.

In the antenna pole of the embodiment configured as described above, the hole 6 is provided in the tip end 5 of the metal pipe 3, so that the synthetic resin injected at high pressure during the injection molding of the synthetic resin forming the decorative bead 7 When the metal is fed under pressure into the cup-shaped tip end 5, the tight contact portion 4a on the inner surface of the plastically deformed portion 4 is pushed open, thereby reliably preventing the metal from flowing into the base side of the metal pipe 3. That is, the synthetic resin that has flowed into the distal end portion 5 through the hole 6 intensively flows into the close contact portion 4a, but is released to the outer circumferential side through the hole 6, and the pressure is concentrated and acts on the close contact portion 4a. This prevents the synthetic resin from flowing into the base of the metal pipe 3 from the close contact portion 4a. In addition, since the injected synthetic resin cools and solidifies from the outer circumferential side, air bubbles are likely to remain in the thick parts.In this example, the tip is columnar of synthetic resin, which is difficult to cool, so there is a risk of air bubbles forming. By providing the metal pipe 3, it is expected that the cooling rate will be stabilized, thereby making it possible to obtain the decorative beads 7 without air bubbles. can be firmly fixed. Furthermore, since the synthetic resin inside and outside of the metal pipe 3 is integrated at the hole 6, the strength of the decorative beads 7 to come off is improved.

In this embodiment, the cross-sectional shape of the plastically deformed portion 4 is cross-shaped, which is a suitable shape in terms of processing stability, ease of manufacturing jigs and tools, and inner surface adhesion.

Note that in this embodiment, the tip end 5 of the pipe 3
The number of holes 6 to be provided is not limited to the number in the embodiment, and the number may be increased or decreased as appropriate, or may be omitted. In addition, in this invention, metal pipe 3
The cross-sectional shape of the plastically deformed portion 4 is not limited to the shape of the embodiment, but may be a triangle, a square such as a polygon,
Any irregular cross-section, such as a star-shaped polygon, that prevents the decorative beads 7 from rotating or coming off may be used.

[Effect of idea]

As explained above, according to the present invention, a pipe with an irregular cross section that is positioned slightly closer to the base side than the tip and whose inner surface is in close contact with the pipe constituting the tip of a pole antenna, such as the tip pole of a multi-stage telescoping pole antenna, is used. Since a plastically deformed portion is formed and a decorative bead is integrally molded with synthetic resin on the plastically deformed portion of the pipe and the portion on the distal end thereof, the plastically deformed portion can be easily crushed and molded, and additional parts are not required. Since the plastic deformation part acts to prevent the decorative beads from falling out and preventing them from rotating, the pipe and the decorative beads can be firmly fixed.
It has a retaining strength of 40Kg or more, which is twice the retainer standard of 20Kg.

Further, according to the present invention, after the decorative beads are molded, no traces of machining of the pipe are visible, and there is little change in the thickness of the molded part, so there are no sink marks or bubbles on the surface of the decorative beads, and the appearance is good.

Furthermore, according to the present invention, it is possible to mold the decorative beads in the antenna assembly line, and there is no need to stock decorative beads or parts for decorative beads such as metal chips as in the past, and pipes can be molded in one piece. The decorative beads can be fixed to the pipe, and the plastically deformed part is provided with an inner contact part, and the synthetic resin does not enter the base side of the pipe beyond this contact part, thereby reducing costs.

[Brief explanation of drawings]

Fig. 1 is a side cross-sectional view of the main part showing one embodiment of the present invention, Fig. 2 is a partial side view with a part of the multi-stage telescopic pole antenna before the decorative beads are attached, and Fig. 3 a and b are FIG. 4 is a side sectional view and a cross sectional view for explaining the processing state of the plastically deformed portion. FIG. 4 is a side sectional view of the tip of the pipe. 1...Multi-stage telescopic pole antenna, 2...Tip pole, 3...Metal pipe, 4...Plastic deformation part, 4
a... Close contact part, 5... Most extreme part, 6... Hole, 7...
... Decorative balls, 8... Tools.

Claims (1)

[Claims for Utility Model Registration] A rectangular, star-shaped polygon, etc., formed by squeezing the pipe from the outer periphery toward the center, making the pipe constituting the tip of the pole antenna in close contact with the inner surface, slightly toward the base of the tip of the pipe. 1. An antenna pole characterized in that a plastically deformed portion having an irregular cross section is formed, and a decorative ball is integrally molded from synthetic resin on the plastically deformed portion of the pipe and a large diameter portion on the distal end side of the deformed portion.