JPH0218573Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an antenna device for an automobile that is inserted through a pillar portion of the automobile and provided on a mounting plate such as the roof of the automobile body.

(Prior Art) Conventionally, as an antenna device for an automobile that is inserted through a pillar portion of an automobile, there is an antenna device that is attached to a mounting plate such as the roof of a front pillar portion. This type of automotive antenna device is
As shown in the figure, it is a multi-stage telescopic type or a single rod type. And which rod antenna element 1
0, the guide tube 1 with at least its top end 11 protruding from the mounting base 12.
It is slidably inserted into 3. Furthermore, a small diameter portion into which the outermost pipe 15 of the rod antenna element 10 is fitted without any gap is formed at the base end of the metal feeding pipe 14 into which the rod antenna element 10 is inserted. A stopper 16 is provided at the lower end of the outermost pipe 15 protruding from the small diameter portion of the base end of the power supply pipe to prevent it from coming off from the power supply pipe 14. Further, a spring 17 is provided on the inner circumferential surface of the intermediate portion of the power supply pipe 14 to press against the outermost pipe 15 . Note that this power supply pipe 14 is integrally formed with a cylindrical resin molded part 8 on the outer periphery, and the base end side of this resin molded part 18 is connected to the guide tube 13 by a connecting pipe 19. .

(Problems to be solved by the invention) The rod antenna element 10 of the automobile antenna device, which is usually attached to a mounting plate on the roof of a car, is often broken due to external force due to its small diameter and long length. I had to replace 10. However, in the above-mentioned automobile antenna device, the rod antenna element 10 is prevented from coming off from the small diameter portion of the power supply pipe 14 by the stopper 16, or the guide tube 13 into which the rod antenna element 10 is slidably inserted is Since it is long (usually about 1500 mm), when the rod antenna element 10 needs to be replaced, it is necessary to remove the mounting base 12 from a mounting plate such as the roof of the automobile and detach the entire automobile antenna device.

Therefore, in order to replace the rod antenna element 10, there was a problem in that the entire automobile antenna device had to be removed and reinstalled, which was a troublesome process.

The purpose of the present invention is to solve the above-mentioned problems and provide an antenna device for an automobile that allows only the rod antenna element to be easily replaced when the rod antenna element is broken, without removing the mounting base etc. from the mounting plate. shall be.

(Means for Solving the Problems) In order to achieve the above object, the automotive antenna device of the present invention includes a cylindrical resin molded part that constitutes a part of the base member, and an inner periphery of the tip of this resin molded part. an insert fitting that is integrally provided on the resin molded part and has a female thread; a power supply pipe that is integrally provided on the inner peripheral surface of the proximal end of the resin molded part and has a stepped part with a narrowed inner diameter; A cylinder that is fitted and inserted into contact with the power supply pipe until insertion is restricted by the stepped portion, a rod antenna element inserted into this cylinder, and an outer diameter of the outermost pipe of this rod antenna element are fitted so that there is no gap. a small diameter portion formed on both end sides of the cylinder;
A tightening nut that screws into the female thread of the insert fitting and fits into the small diameter portion on the distal end side of the cylinder to prevent the cylinder from coming off; and a tightening nut that is attached to and detachable from the outermost pipe protruding from the small diameter portion on the proximal end side of the cylinder. It is configured to include a freely provided stopper.

(Function) The structure is such that the cylinder is prevented from coming off by a tightening nut that is screwed into the insert fitting provided integrally at the tip of the resin molded part. By removing the tightening nut, the cylinder and rod antenna can be removed. The element can be extracted to the outside. Then, by removing the stopper attached to the outermost pipe of the rod antenna element, the rod antenna element can be extracted from the cylinder. Moreover, this tightening nut has nothing to do with attaching the base member to a mounting plate such as the roof of an automobile, and even if the tightening nut is removed, the attachment of the base member will not loosen. In addition, a small diameter part is provided on the tip side of the cylinder so that the outermost pipe fits without any gaps, so rainwater, sand, etc.
Dust etc. do not enter. Furthermore, since the outermost pipe is slidably supported by the small diameter portions at both ends of the cylinder, the rod antenna element is stably supported.

(Example) The present invention will be described below based on an example shown in the drawings. In FIG. 1, reference numeral 20 denotes a cylinder, and the outermost pipe 1 of the rod antenna element 10 is attached to both ends of the cylinder 20 at its tip and base.
5 is slidable and fits into the small diameter part 20 without any gaps.
a, 20c are formed. Furthermore, the cylinder 20
The outermost pipe 15 is disposed on the inner peripheral surface of the intermediate portion 20b.
A spring 17 is provided which presses against. and,
As shown in the extended state in FIG. 1, a multi-stage telescopic rod antenna element 10 is fitted and inserted into this cylinder 20 from its base end side, and the rod antenna element protrudes from a small diameter portion 20c at the base end of the cylinder 20. A stopper 16 is detachably attached to the base end of the outermost pipe 15 of No. 10 by an E-ring 21, and this stopper 16 comes into contact with the small diameter portion 20c at the base end of the cylinder 20 to prevent it from coming off in the extension direction. will be done. Further, a connecting tube 19 connects a guide tube 13 to the base end of the resin molded portion 18.
are integrally provided. Note that the resin molded portion 18, the guide tube 13, and the mounting base 12 constitute a base member 30. Then, the cylinder 20 is fitted and inserted from the distal end side of the cylindrical resin molded part 18, and the cylinder 20 is inserted into contact with the power supply pipe 14 that is integrally provided on the base end side of the resin molded part 18, thereby establishing conduction. I can figure it out. Also, cylinder 2
0 on the stepped portion 14a formed in the power supply pipe 14,
The stepped portion formed by the small diameter portion 20c on the base end side of the cylinder 20 blocks and restricts insertion. Furthermore, by screwing the tightening nut 23 into the female thread of the insert fitting 22 integrally molded with the resin molded part 18, the small diameter of the tip side of the cylinder 20 is attached to the inner periphery of the tightening nut 23. The portion 20c is fitted to prevent the cylinder 20 from coming off. The above-mentioned automobile antenna device is mounted by screwing the mounting base 12 constituting the base member 30 to a mounting plate such as the roof of the vehicle body using screws. Furthermore, in FIG. 1, the same reference numerals as in FIGS. 2 and 3 indicate corresponding members.

In the automobile antenna device of the embodiment constructed as described above, by removing the tightening nut 23, the rod antenna element 10 can be pulled out together with the cylinder 20 to the outside of the vehicle body in the direction shown by the arrow. Then, the cylinder 20 and the rod antenna element 10 that have been extracted can be replaced by removing the E ring 21 and the stopper 16 provided at the base end of the outermost pipe 15. . Here, if the outer diameter of the top end 11 is smaller than or the same diameter as the outermost pipe 15, the rod antenna element 10 can be replaced without removing the stopper 16 of the outermost pipe 15. Furthermore, the cylinder 20 and the rod antenna element 10 can be attached from the outside of the vehicle body by performing the reverse procedure. Therefore, even if the rod antenna element 10 is broken due to external force or the like, the rod antenna element 10 can be easily replaced and removed from the outside of the vehicle body while the base member 30 and the like are still attached to the vehicle body.

(Effects of the invention) As explained above, according to the automotive antenna device of the invention, by removing the tightening nut,
The cylinder and rod antenna element can be easily extracted from the base member on the outside of the vehicle body, and the rod antenna element can be extracted from the cylinder by removing the stopper. Therefore, the rod antenna element can be easily replaced while the base member remains attached to the vehicle body. Furthermore, the attachment of the base member does not become loose due to attachment and detachment of the tightening nut, and the effort required for replacement work is reduced accordingly. In addition, the insert fitting into which the tightening nut is screwed is provided integrally with the resin molded part, and the cylinder and power supply pipe as component parts can be formed by simply sheet metal processing a thin plate, making the entire device inexpensive to manufacture. . In addition, a small diameter part is provided on the tip side of the cylinder so that it fits tightly into the outermost pipe of the rod antenna element, so rainwater, sand, dust, etc. do not enter the cylinder, and this small diameter part on the tip side Since the tightening nut fits into the small diameter part, there is no gap between the small diameter part and the tightening nut, and rainwater, etc., does not enter into the cylindrical resin molded part, preventing various problems caused by such intrusion. Don't let it happen. Furthermore, since the outermost pipe of the rod antenna element is supported by the small diameter portions at both ends of the cylinder, the support of the rod antenna element is stable, and vibrations, noise, etc. are not generated.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a state in which a rod antenna element is attached to a cylinder. FIG. 3 is a longitudinal cross-sectional view of a conventional device without showing the main parts thereof. 10: Rod antenna element, 14: Power supply pipe, 14a: Step part, 15: Outermost pipe, 16:
Stopper, 18: Resin molded part, 19: Connection tube, 20: Cylinder, 20a: Small diameter part on the tip side,
20c: Small diameter portion on the base end side, 22: Insert fitting, 23: Tightening nut, 30: Base member.

Claims (1)

[Scope of utility model registration request] A cylindrical resin molded part constituting a part of the base member, an insert metal fitting integrally provided on the inner periphery of the distal end of the resin molded part and having a female thread, and an insert fitting integrally provided on the inner periphery of the proximal end of the resin molded part. a power supply pipe having a stepped portion with a narrowed inner diameter; a cylinder that is fitted and inserted into the resin molded portion from the distal end side until insertion is regulated by the stepped portion and comes into contact with the power supply pipe; The rod antenna element to be inserted into the rod antenna element, the small diameter portions formed at both ends of the cylinder so that the outer diameter of the outermost pipe of the rod antenna element can be fitted without any gaps, and the female thread of the insert fitting are screwed into the cylinder. A tightening nut that fits into a small diameter portion on the distal end side of the cylinder to prevent the cylinder from coming off, and a stopper that is detachably provided on the outermost pipe protruding from the small diameter portion on the proximal end side of the cylinder. An automotive antenna device featuring: