JPS5822322Y2 - rod antenna - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rod antenna, and particularly to a rod antenna suitable for mass production.

Conventionally, a method for fixing a top to be provided at the tip of a multi-stage telescoping antenna element constituting a rod antenna has been carried out by threading, press-fitting, or caulking the top and the tip pole.

However, with these fixing methods, the processing accuracy changes over time, resulting in unevenness in the product, so it cannot withstand long-term use, regardless of the initial use, and defects such as the top falling out or cracking occur. However, there are disadvantages such as high processing costs.

Recently, attempts have been made to use adhesives with significantly improved adhesive strength.

In this case, a predetermined strength can only be obtained when the bonding conditions are satisfied, and the members to be bonded to each other must have a structure that increases the bonding effect.

However, the current situation is that a satisfactory adhesive effect has not yet been achieved.

In particular, recently, safety standards have become stricter, and when extending and retracting rod antennas, it is necessary to ensure that the top will not come off or be damaged even if the top is pinched and expanded, contracted, and rotated. , it is necessary to develop a fixing structure that can sufficiently withstand torsional forces and the like.

The present invention was devised in view of the current situation, and its purpose is to provide a rod antenna having a structure in which the top can be firmly and reliably fixed to the tip pole using an adhesive.

In the present invention, the top is provided with an insertion hole into which the tip pole is inserted, and an adhesive reservoir that is continuous with the insertion hole, and the tip of the tip pole is connected to the adhesive reservoir in the insertion portion of the tip pole into the top. A split groove cut in the axial direction from the bottom and a ring groove arranged in an annular manner on the outer circumferential surface are provided, respectively, so that strong adhesive force can be obtained.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings.

As shown in FIG. 1, the rod antenna 1 according to the present invention includes a multi-stage telescopic antenna element 2 that is extendable and retractable and rotatable around an axis, and a tip pole 2 of the multi-stage telescopic antenna element 2.
A and a top 3 fixed to the tip.

As shown in FIG. 1, the top 3 usually has a truncated cone shape, and has a uniform diameter insert into which a tip pole 2a (to be described later) is inserted, as shown in FIG. 2. hole 4
A conical adhesive reservoir 5 is provided which is continuous with the insertion hole 4 and gradually tapers toward the tip.

A step 6 is formed at the connection between the insertion hole 4 and the adhesive reservoir 5, and the tip of the tip pole 2a comes into contact with the step 6, and the tip pole 2a is no longer connected to the insertion hole 4. It is configured not to be inserted.

The inner diameter of this insertion hole 4 is formed to be slightly smaller than the outer diameter of the tip pole za.

On the other hand, as shown in FIGS. 2 to 4, the insertion portion of the tip pole 2a into the insertion hole 4 is provided with a split groove 7 cut in the axial direction from the tip.
An annular ring groove 8 that is divided into two in the circumferential direction by a dividing groove 7 is provided on the outer periphery of a.

The axial length of the split groove 7 is shorter than the axial length of the insertion hole 4, so that when the tip pole 2a is inserted into the insertion hole 4, the split groove 7 splits as shown in FIG. The groove 7 is configured to be completely buried in the insertion hole 4.

In the above configuration, when bonding is performed, first the adhesive A is filled over a part of the depth of the adhesive reservoir 5 and the insertion hole 4, and then the tip pole 2a is inserted into the insertion hole 4.

Then, the tip of the tip pole 2a is inserted up to the rear part 6 and stopped, as shown in FIG.

At this time, since the tip pole 2a is provided with the split groove 7, even the tip pole 2a having a slightly larger diameter than the inner diameter of the insertion hole 4 can be inserted into the insertion hole 4 without any hindrance.

□Since the end part is not provided with the dividing groove 7,
The connection is firmly press-fitted.

On the other hand, the adhesive is compressed by the tip of the tip bond 2a, and when it reaches a certain level, it enters the split groove 7 in search of an escape route.

At this time, since the adhesive reservoir 5 has a conical shape, the adhesive easily enters the split groove 7 as a reaction to the pressure.

The adhesive that has entered the split groove 7 is further compressed by the insertion of the tip pole 2a as the split groove 7 becomes narrower, and is forced into the circumference of the ring groove 8 as shown in FIG. It goes all over.

Note that the split groove 7 is not provided at the end of the four insertion holes of the tip pole 2a, and therefore the adhesive is inserted into the insertion hole 4 and the tip pole 2a. The adhesive, which does not leak to the outside between the two and has no outlet, is pressure-injected into the adhesive surface between the adhesive reservoir 5 and the ring groove 8.

Since the elasticity of the groove 7 always acts on the circumferential surface of the insertion hole 4 on this adhesive surface, strong adhesion is possible.

In the above embodiment, the split groove 7 was provided only in one direction, but in addition to the split groove 7, a split groove 17 orthogonal to the split groove 7 is provided as shown by the chain line in FIG. Good too.

Further, in the above embodiments, the adhesive reservoir 5 is formed in a conical shape, but it may be formed in a semispherical shape as shown in FIG. Good too.

Even with this configuration, effects comparable to those of the embodiment described above can be obtained.

As explained above, according to the present invention, the following effects can be obtained.

(1) In the conventional method of applying adhesive to the inner and outer peripheral surfaces of mutual parts, the adhesive surface was broken due to contact between the parts when mating, causing problems later on. However, according to the present invention, the split groove and the adhesive reservoir completely surround the adhesive surface, and the adhesive in the b (2) ring groove, which is expected to provide strong adhesion, is filled. It is possible to further strengthen the adhesion and prevent the adhesive from leaking to the outside.

(3) If the split groove does not reach the insertion proximal end of the tip pole, the proximal end will be press-fitted into the insertion hole, making the connection strong and secure, and matching the ring groove. As a result, leakage of adhesive can be completely prevented.

(4) Since the number of processing steps is small, it is possible to plan for cost reduction.

Furthermore, since assembly is easy, it is suitable for mass production.

As described above, according to the present invention, the top can be firmly and reliably fixed to the tip pole using an adhesive.

[Brief explanation of the drawing]

Fig. 1 is an overall view of the rod antenna, Fig. 2 is an enlarged exploded sectional view showing an embodiment of the present invention, Fig. 3 is a partial sectional view of a multi-stage telescopic antenna element, Fig. 4 is a plan view of the tip pole, FIG. 5 is a cross-sectional view of an assembled state of one embodiment of the present invention, and FIGS. 6 and 7 are cross-sectional views of the top showing different embodiments of the adhesive reservoir. 1...Rod antenna, 2...Multi-stage telescopic antenna element, 2a...Tip pole, 3...
...Top, 4...Insertion hole, 5...
・Adhesive reservoir part, 7... Division groove, 8...
・Ring groove.

Claims (1)

[Scope of utility model registration request] 1. In a rod antenna comprising an antenna body and a top fixed to a tip pole of the antenna body, the top has an insertion hole into which the tip pole is inserted and an adhesive reservoir continuous to the back end of the insertion hole. established,
Further, the top of the tip pole is provided with a split groove that communicates with the adhesive reservoir and cuts in the axial direction from the tip, and a ring groove that is arranged in an annular shape on the outer periphery, at the insertion portion of the top of the tip pole into the insertion hole. rod antenna. 2. The rod antenna according to claim 1, wherein the adhesive reservoir has a conical shape that gradually tapers from the insertion hole side toward the inner end.