JPS5852724Y2 - multi-stage rod antenna - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multi-stage rod antenna, and more particularly to a multi-stage rod antenna in which a top ornament and a top rod are integrally coupled.

It is well known that multi-stage rod antennas are used in radio receivers, portable television receivers, etc. When this type of antenna is not in use, it is reduced in size and can be collapsed from its pivot-supported base end. Many of them are stored along the cabinet of the receiver, etc., and the top rod is held in the catcher.

In such a multi-stage rod antenna, when it is retracted (retracted state), the catcher C catches only the top rod or the final stage, and the upper ends of the other rods are in a free state.

That is, two eyelet springs are fixed to the base of each rod so as to be hugged, and the eyelet springs rub against the inner surface of the outer rod when the rod is extended.

However, when contracted, the spring of each rod moves to the base end of the other rod, so the upper end of each rod becomes free.

Therefore, AM can be received without using an antenna.
In broadcasting, etc., the rod antenna may make a chattering noise when the volume of the receiver is increased.

Therefore, in order to prevent this phenomenon, when the rod antenna is contracted, the upper end of each rod is press-fitted into the skirt of a decorative ball provided on the top rod, and the inner surface of the skirt portion is tightened on each rod. The rod antenna is designed to prevent it from vibrating.

The top decorative bead, which has an important function in terms of preventing chattering noise, has a male threaded rod N fixed to the tip of the top rod R, as shown in the cross-sectional view in Figure 2. A rod N is screwed into a female threaded portion M embedded in a top decorative ball K.

The upper ends of the second-stage rod R2 and the third-stage rod R3 are held down by the inner surface of the skirt portion S of the top decorative ball.

Therefore, a slight torque (0,5
When Kp/cIfL) was applied, the top rod would loosen and come off, exposing the tip of the top rod, which could cause injury.

Therefore, in order to ensure the safety of the user, it is necessary to ensure that the top rod and the top decorative beads are integrated permanently and to prevent each rod from being pulled out and vibrating while being held in the catcher. Ta.

The present invention was devised in response to these demands, and it firmly fixes the top rod and the top decorative beads so that they do not easily separate, and the fixing method is simple. To provide a multi-stage lot antenna which can prevent the lot from being pulled out and noise when held between the antennas.

Hereinafter, details of the present invention will be explained with reference to the accompanying drawings.

First, FIG. 3 shows a multi-stage rot antenna according to the present invention, and this multi-stage rot antenna consists of dog rods la, 2
Stage rod lb, 3rd stage rod 1C14th stage rod 1d
It is made up of.

In this multistage rod antenna 1, a plurality of recesses 2 are formed on the upper end circumferential surface of a top rod 1a having a circular cross section, and the shape of the recesses 2 is as shown in FIGS. 4 and 5. Examples include one in which the top rod 1a is cut into a quadrilateral shape, or one in which only two sides are cut to create a flat surface.

A decorative bead 3 is fixed to this top rod 1a, and this decorative bead 3 is made of metal, plastic, synthetic rubber, etc. and is formed into a substantially truncated conical shape, and has a blind rod insertion hole 3a in the center. , this rod insertion hole 3a
Continuing from this, a fitting space 3b having a truncated conical shape is formed into which the upper end of each of the second and subsequent lots is fitted.

Then, on the outer peripheral surface of the decorative ball 3 and in the rod insertion hole 3.
After fitting the tip of the top rod 1a into the groove a,
A part of the material of the decorative bead 3 is pressed into the recessed part 2 by pressing from the outer periphery with a press mold to integrate the two.

When the decorative beads 3 are made of metal, they are integrated with the top rod 1a by press working, and when the decorative beads 3 are made of plastic or synthetic rubber, they are crimped and fixed using a welding iron.

Further, the concave groove 4 of the decorative bead 3 is used not only for the integration with the top rod 1a, but also as a groove for holding a catcher when the rod antenna is contracted and retracted and laid down.

Since the multi-stage rot antenna of the present invention has the above-mentioned configuration, the top rod 1a and the decorative beads 3 are integrated without being screwed together, so they do not come off over the course of use. Both can be permanently fixed, preventing injury during operation of the rotary antenna.

As is clear from the above description, according to the multistage rot antenna of the present invention, a recess is formed at the tip of the top rod, and a recess is formed in a part of the top decorative bead corresponding to the recess. A part of the top decorative bead is inserted into the concave portion of the top rod through the groove to integrally connect the top rod and the top decorative bead, so that the top decorative bead is easily separated from the top rod. It is safe without any problems, and
Since the concave groove is used as a catcher groove, it is possible to reliably prevent each lot from being pulled out in the stored state, and to prevent rattling of each lot in the stored state, thereby eliminating generation of noise.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of a radio receiver equipped with a conventional multi-stage rod antenna, Fig. 2 is an enlarged sectional view taken along the line ■-n in Fig. 1, and Fig. 3 is a partial perspective view of a radio receiver equipped with a conventional multi-stage rod antenna. The partially cutaway side view of the tip, and FIGS. 4 and 5 are cross-sectional views showing the recessed portion side of the top rod. 1...Lot antenna, 1a...Top rod, 1b...2nd stage rod, 1c...
...Third stage rod, 2...Concave portion, 3...
... Decorative beads, 4... Concave grooves.

Claims (1)

[Scope of utility model registration request] In a multi-stage rod antenna that can be raised and lowered freely and is held in a catcher when contracted and laid down, a concave part is formed at the tip of the top rod, and a concave groove is formed in a part of the top decorative bead corresponding to this concave part. A part of the top decorative bead is inserted into the concave portion of the top rod through the concave groove to integrally connect the top rod and the top decorative bead, thereby forming a holding groove of the concave catcher. A multi-stage rod antenna featuring