JPH066572Y2 - Telescopic antenna device - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a telescopic antenna device mounted on an automobile or the like, and in particular, mitigates a collision between removal preventing stoppers at the completion of extension operation of a rod antenna element. Regarding means.

[Conventional technology]

In the conventional telescopic antenna device of this type, as shown in FIG. 2, in order to prevent the rod antenna element from being pulled out when the extension is completed, the metallic fixed stopper 2 is provided in the vicinity of the antenna insertion / removal opening of the storage cylinder 1. Was provided together with the holding pipe 3, and the metallic movable stopper 5 was provided near the base end of the antenna element 4. In addition, 6 in FIG. 2 is a drive rope for expanding and contracting the antenna.

[Problems to be solved by the invention]

In the conventional device having the above-mentioned configuration, since both the fixed side stopper 2 and the movable side stopper 5 are made of metal, when the antenna element 4 is pushed up by the drive rope 6 transferred by the motor drive during the antenna extension operation, When the antenna extending operation is completed, the stoppers 2 and 5 collide violently, which causes a large collision noise and has a drawback that the stopper portion is easily damaged.

In order to solve such a problem, it has been considered to form the stopper with an elastic member such as synthetic resin. However, even if such measures are taken, the collision noise is reduced, but it is not completely eliminated. In other words, it was not an essential solution.

Therefore, it is an object of the present invention to provide a telescopic antenna device that produces almost no collision noise even when the antenna element is extended by a strong force and damage of the stopper portion is significantly reduced. .

[Means for solving problems]

The present invention has taken the following means in order to solve the above problems and achieve the object. That is, the rod antenna element is removably housed in the housing cylinder, and a fixed stopper is provided near the antenna insertion / removal of the housing cylinder, and a movable stopper is provided near the base end of the antenna element. In a telescopic antenna device configured to prevent the antenna element from being pulled out of the storage cylinder, a fixed-side rubber magnet is arranged in a portion of the fixed-side stopper that faces the movable-side stopper, and a movable-side rubber magnet is provided. The fixed-side rubber magnet and the movable-side stopper are disposed in a portion of the movable-side stopper facing the fixed-side stopper so that the same poles are opposite to each other, and the fixed-side stopper and the movable side are moved by moving the antenna element in the extension direction. The feature is that the collision with the stopper is alleviated.

[Action]

By taking such a measure, when the movable side stopper approaches the fixed side stopper, the fixed side rubber magnet disposed in the portion of the fixed side stopper facing the movable side stopper and the fixed side rubber magnet are The repulsive force is applied by the movable rubber magnet that is arranged in the portion of the movable stopper facing the fixed stopper so that the poles face each other, and the approaching speed of the movable stopper decreases sharply. The violent collision between the movable stopper and the movable stopper is avoided. As a result, almost no collision noise is generated and no damage is caused. Even if a slight collision occurs, the elastic action of both rubber magnets that collide with each other works, and at this point, the collision noise hardly occurs.

〔Example〕

FIG. 1 is a sectional view showing the construction of an embodiment of the present invention.
The same parts as those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, reference numeral 7 denotes a fixed side rubber magnet attached to the abutting portion of the fixed side stopper 2. For example, the lower side is magnetized as an N pole and the upper side is magnetized as an S pole. Further, 8 is a movable side stopper 5
Is a movable-side rubber magnet attached to the abutting portion of, and is magnetized, for example, to the N pole on the upper side and the S pole on the lower side. That is, both magnets are arranged such that magnetic poles (N) of the same polarity face each other. That is, as shown in FIG. 1, the fixed-side rubber magnet 7 is disposed in a portion of the fixed-side stopper 2 that faces the movable-side stopper 5, and the movable-side rubber magnet 8 has the same polarity as the fixed-side rubber magnet 2. The movable-side stopper 5 is disposed at a position facing the fixed-side stopper 2 so as to face each other.

According to the present embodiment configured as described above, the antenna element 4 is pushed out from the storage cylinder 1 by the drive rope 6 during the antenna extension operation, and rises to the position immediately before full extension,
When the distance L between the magnet 8 attached to the movable side stopper 5 and the magnet 7 attached to the fixed side stopper 2 falls within the repulsive force generation area due to the magnetic force, the repulsive force by both magnets 7 and 8 works to move the magnet. The approaching speed of the side magnet 8 decreases rapidly. Then, finally, the movable magnet 8 comes into contact with the fixed magnet 7 by soft touch. As a result, both stoppers 2,
The collision sound between the five is hardly generated. In particular, in this embodiment, since the magnets 7 and 8 themselves are rubber magnets, even if some collision occurs,
The elastic action of both the rubber magnets 7 and 8 that collide with each other works, and even at this point, the collision noise hardly occurs.

The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effect of device]

According to the present invention, the fixed-side rubber magnet is arranged in a portion of the fixed-side stopper that faces the movable-side stopper, and the movable-side rubber magnet is provided in the movable-side stopper so that the same pole and the fixed-side rubber magnet face each other. By arranging the fixed-side stopper at the portion facing the fixed-side stopper, the fixed-side rubber magnet disposed at the portion of the fixed-side stopper facing the movable-side stopper even when the antenna element is extended by a strong force. And a repulsive force is exerted by the movable rubber magnet disposed in a portion of the movable stopper facing the fixed stopper so that the same pole and the same magnet face each other,
The approaching speed of the movable side stopper is rapidly reduced, and a violent collision between the fixed side stopper and the movable side stopper is avoided. As a result, almost no collision noise is generated, damage is not caused, and even if some collision occurs, the elastic action of both rubber magnets that collide works, and in this respect also collision noise hardly occurs. It is possible to provide a telescopic antenna device as follows.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of a conventional example. 1 ... Storage tube, 2 ... Fixed side stopper, 3 ... Holding pipe, 4 ... Antenna element, 5 ... Movable side stopper, 6 ...
… Drive rope, 7 …… fixed side rubber magnet, 8 …… movable side rubber magnet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Noguchi 4-17-13 Minamioi, Shinagawa-ku, Tokyo Harada Industry Co., Ltd. (72) Miaki Hirasa 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor Hiroshi Motokubota 1-228 Gosho-dori, Hyogo-ku, Kobe-shi, Hyogo Fujitsu Ten Co., Ltd. No. 28 Fujitsu Ten Limited (72) Inventor Hayato Endo 1-2-2 Goshodori, Hyogo-ku, Kobe-shi, Hyogo Inside Fujitsu Ten Limited (56) References Japanese Patent Publication No. 56-2443 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A rod antenna element is removably housed in a housing cylinder, a fixed stopper is provided near the antenna insertion / removal of the housing cylinder, and a movable stopper is provided near the base end of the antenna element. Thus, in the telescopic antenna device configured to prevent the antenna element from being pulled out of the storage cylinder, the fixed side rubber magnet is disposed at a portion of the fixed side stopper facing the movable side stopper, and the movable side A rubber magnet is disposed at a portion of the movable stopper facing the fixed stopper so that the same poles of the rubber magnet and the fixed rubber magnet face each other, and the fixed stopper is formed by moving the antenna element in the extension direction. A telescopic antenna device, characterized in that a collision with the movable side stopper is mitigated.