JPH0145132Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an antenna device that is housed in a long and narrow enclosed storage area that is out of reach, such as in a pillar of a vehicle body, and in particular, to effectively prevent the occurrence of rattling noise. The present invention relates to an antenna device capable of

In the case of antenna devices that are generally installed in automobiles, in recent years a large number of various devices have been installed in the engine compartment of the car body, etc.
It is becoming difficult to secure sufficient antenna mounting space.

For this reason, recently, antenna devices have been placed in long, enclosed storage areas that are out of reach, such as inside pillars of vehicle bodies, which were traditionally considered dead spaces.

By the way, conventional antenna devices of this type include a single antenna element 1 made of a solid material as shown in FIG. Long tip element 1b
Using a two-stage telescopic antenna element 1 consisting of
As shown in FIG. 3, an antenna is known in which the antenna element 1 is slidably disposed within a flexible guide tube 2, and the antenna element 1 is disposed within a pillar 3.

However, the antenna element 1 is not connected to the guide tube 2.
When the antenna is in a contracted state, a large gap G ₁ is formed between the antenna element 1 and the guide tube 2, as shown in FIG. A large gap G ₂ is also formed between the antenna elements 1 and 1.
There is a problem in that a rattling sound is generated during running due to the collision between the guide tube 2 and the guide tube 2 or the collision between the guide tube 2 and the pillar 3.

As a method of preventing rattling noise between the guide tube 2 and the pillar 3, for example, it is possible to fix cushioning material around the guide tube 2 at multiple locations in the longitudinal direction. As shown, it has a flat shape, and its inner surface is not smooth and has many protrusions.In order to pass the antenna through the protrusions and insert it into the pillar 3, the cushion material must be inserted into the pillar 3. It has no choice but to have a smaller diameter than the inner diameter of. For this reason, there is a drawback that even if a cushion material is provided, it is not possible to completely prevent the guide tube 2 from wobbling.

Further, even if it is possible to prevent the guide tube 2 from rattling with the cushion material, it is not possible to prevent the antenna element 1 from rattling, and it is impossible to completely prevent the rattling sound.

The present invention was developed in view of the current situation, and an object of the present invention is to provide an antenna device that can eliminate the rattling of the antenna element and the guide tube and completely prevent the rattling sound.

As a means to achieve the above object, the present invention provides bent portions at multiple locations in the longitudinal direction of the guide tube, brings each bent portion into contact with the inner surface of a housing section such as a pillar of the vehicle body, and provides an antenna on the inner surface of each bent portion. A feature is that the elements are brought into sliding contact.

Hereinafter, embodiments of the present invention will be described with reference to FIG. 4 and subsequent figures.

In FIG. 4, reference numeral 11 is a pillar in the shape of a flat cylinder arranged between a windshield 12 and a side glass 13 of an automobile. An antenna device 14 is inserted into this pillar 11, and its lower end is It is fixed in a curved state along the wheel house.

The antenna device, as also shown in FIG.
A mounting base 15 fixed near the top of the pillar 11, a cylindrical power feeding fitting 16 fixed to this mounting base 15, an antenna element 17 slidably penetrating this feeding fitting 16, and a tip of the feeding fitting The guide tube 18 is connected to the antenna element 16 and slidably guides the antenna element 17.

The antenna element 17 is formed into a single solid bar made of stainless steel with a diameter of, for example, about 3 mm, and a stopper 19 made of, for example, brass is fixed to the base end thereof. A decorative bead 20 made of, for example, ABS resin is fixed to the externally protruding tip portion, which serves as a knob when the antenna is extended and a stopper when the antenna is retracted.

The guide tube 18 is made of an elastic material with restoring force, such as polypropylene or rubber, and is formed into a cylindrical shape with an outer diameter of about 7 mm and an inner diameter of about 5 mm.
As shown in FIG. 5, bent portions 21 bent in a dogleg shape are formed at intervals of about 200 mm.

Each bent portion 21 is formed by attaching a cylindrical short metal tube 22 bent in a dogleg shape in advance to the outer peripheral surface of the guide tube 18, as shown in FIG. The short metal tube 22 is formed by forcibly bending to follow the shape of the tube 22, and after being attached to the guide tube 18, the short metal tube 22 is fixed in position by punching 23. and,
As shown in FIG. 5, the bending directions of the adjacent bent portions 21 are shifted by 180 degrees around the axis, so that the outer surface of the bent portion 21 comes into pressure contact with the inner surface of the pillar 11, and The antenna element 17 is adapted to come into sliding contact with the inner surface of the bent portion 21.

In the above configuration, the antenna device 14 is
As shown in the figure, when the guide tube 18 is inserted into the pillar 11 of an automobile, each of the plurality of bent portions 21 provided in the guide tube 18, as shown in FIG. The antenna element 17 is pressed against the inner surface of each curved portion 21 and slidably contacted with the inner surface of each bent portion 21 .
Therefore, it is possible to effectively prevent the guide tube 18 from being rattled within the pillar 11 and the antenna element 17 from being rattled within the guide tube 18, and the accompanying rattling noise can be prevented. . Furthermore, since the antenna element 17 is in sliding contact with the inner surface of each bent portion 21, the force for holding the position of the antenna element 17 increases due to the frictional resistance accompanying the sliding contact, so that, for example, when the antenna element 17 is pulled out halfway, Even in use, the antenna element 17 does not move in the longitudinal direction, and the resulting noise can be effectively prevented.

Note that the guide tube 18 is pressed against the inner surface of the pillar 11, but this is not done by increasing the diameter of the guide tube 18 to be almost the same as the inner diameter of the pillar 11, but by using the bent portion 21. Therefore, even if the pillar 11 has a flat cylindrical shape or there is a protrusion inside the pillar 11, the antenna device 1 can be operated without any problem.
4 can be inserted into the pillar 11. Also, due to each bent portion 21 of the guide tube 18, the antenna element 17 may be slightly bent by the guide tube 18.
Although it may curve inside, this type of antenna element 17 originally has a certain degree of flexibility, so when it is extended, it returns to a straight shape and there is no risk of impairing its function as an antenna. .

FIG. 7 shows a modification of the first embodiment, in which the bent portions 21 provided at a plurality of locations on the guide tube 18 are not bent in a dogleg shape, but are pre-curved with a constant curvature. metal short tube 2
2', and has a curved shape with no corners.

Even with this configuration, the same effects as in the embodiment described above can be obtained.

FIG. 8 shows a second embodiment of the present invention, in which a cushion material 24 is arranged on the outer peripheral surface of the short metal tube 22 in the first embodiment.

That is, the guide tube 18 that slidably houses the antenna element 17 is provided with bent portions 21 that are bent in a dogleg shape at a plurality of locations in the longitudinal direction. Each bent portion is connected to the guide tube 1 by connecting a cylindrical metal short tube 22 which is bent in advance into a dogleg shape.
8 and is formed by forcibly bending a straight guide tube 18 to follow the shape of the short metal tube 22, which is the same as in the first embodiment. After being attached to the guide tube 18, the position is fixed by punching or the like.

Each bent portion 21 has an adjacent bent portion 21
The bending direction of each bent portion 21 is deviated by 180 degrees around the axis, and a soft cushion material 24 made of foamed polyurethane or the like is provided on the outer peripheral surface of each bent portion 21.
is fixed by gluing or other methods. This cushion material 2 is provided on the inner surface of the pillar 11.
4 are in pressure contact with each other, and the cushioning effect of the cushion material 24, together with the elastic restoring force of the guide tube 18 itself, prevents the guide tube 18 from wobbling.

With this configuration, it is possible to more effectively prevent the guide tube 18 from rattling, and even if the bent portion 21 separates from the inner surface of the pillar 11 due to large vibrations caused by driving on a rough road, etc. The cushion material 24 can effectively prevent the guide tube 18 and the inner surface of the pillar 11 from colliding.

FIG. 9 shows a third embodiment of the present invention, in which the short metal tube 22 in the second embodiment is omitted, and the number of parts can be reduced to reduce costs.

That is, the guide tube 18 that slidably houses the antenna element 17 is provided with bent portions 21 that are bent in a dogleg shape at multiple locations in the longitudinal direction, with the bending direction being sequentially shifted by 180 degrees around the axis. , a pillar 11 formed of foamed polyurethane or other soft material is provided on the outer peripheral surface of each bent portion 21.
A cushion material 24 that is pressed into contact with the inner surface of the housing is fixed by adhesion or other methods.

Each of the bent portions 21 is formed by partially heat-treating the straight guide tube 18 to permanently deform the portion, thereby making it possible to omit the short metal tube 22. There is.

By omitting the metal short tube 22 in this way, the number of parts can be reduced accordingly, and costs can be reduced.

In addition, in each of the above embodiments, the guide tube 18
The bending direction of each bent portion 21 is sequentially shifted by 180 degrees around the axis, but if it is possible to effectively prevent the guide tube 18 from wobbling within the pillar 11, the bending direction of the adjacent bent portion 21 can be shifted around the axis by 180 degrees. There is no need to shift it around 180 degrees, for example 120
It may be in the same direction as the case may be.

Further, in the embodiment described above, the antenna device 14 is arranged in the pillar 11 portion of the automobile, but if it is a long and narrow cylindrical storage part that is out of reach,
The present invention can be applied to areas other than the pillar 11 portion.

In addition, although the case of the single rod type antenna element 17 having a single rod shape has been described above, the antenna element 17 has a short cylindrical base end element and a solid rod shape as in the conventional antenna element 1 shown in FIG. A similar effect can be obtained by using an elongated tip element formed to be expandable and retractable in two stages.

As explained above, the present invention provides bent portions at multiple locations in the longitudinal direction of the guide tube, brings each bent portion into contact with the inner surface of the storage portion, and allows the antenna element to slide into contact with the inner surface of each bent portion. Therefore, it is possible to prevent the guide tube and the antenna element from rattling, and to eliminate the accompanying rattling noise. Further, the guide tube and the antenna element can be prevented from shaking at the same time by a simple method of providing a bent portion in the guide tube, so that an increase in manufacturing costs can be suppressed as much as possible.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing the structure of an antenna element used in a conventional antenna device, respectively. FIG. 3 is an explanatory diagram showing a state in which the conventional antenna device is arranged inside a pillar. FIG. 4 5 is a perspective view of the installed state showing the first embodiment of the present invention, and FIG.
6 is an enlarged sectional view showing details of the bent portion, FIG. 7 is an explanatory diagram showing bent portions with different shapes, and FIG. 8 is a second embodiment of the present invention. FIG. 9 is a sectional view showing a third embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Pillar (storage part), 14... Antenna device, 17... Antenna element, 18... Guide tube, 21... Bent part, 22, 22'... Metal short tube, 24... Cushion material.

Claims (1)

[Claims for Utility Model Registration] 1. A system comprising: a flexible guide tube inserted into a cylindrical elongated housing; and an antenna element slidably inserted into the guide tube; An antenna device characterized in that the tube is provided with bent portions at a plurality of locations in the longitudinal direction, each bent portion is brought into contact with the inner surface of the storage portion, and the antenna element is brought into sliding contact with the inner surface of each bent portion of the guide tube. . 2. The antenna device according to claim 1, wherein the bending directions of adjacent bent portions are different from each other around the axis. 3. The antenna device according to claim 1 or 2 of the utility model registration, characterized in that a cushion material is fixed to the outer surface of the bent portion. 4. The antenna device according to claim 1, wherein the bent portion of the guide tube is formed by fitting a curved rigid short tube into the guide tube.