JPH028408Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a multi-stage telescopic rod antenna device installed in a vehicle such as an automobile, and particularly relates to an improvement in waterproofing means between stages between an outer rod and an inner rod.

[Technical background of the invention and its problems]

In a conventional multistage telescopic rod antenna device of this type, a locking step is formed at the upper end of the outer rod, and this step is made of, for example, a conductive rubber O-ring or an insulating rubber O-ring. The elastic ring for sealing and the collar made of "Shinchiyu" etc. are inserted and the tip of the outer rod is press-fitted and fixed by caulking to prevent rainwater etc. from entering from the gap between the outer rod and the inner rod. It prevents it from coming.

However, in the above-mentioned waterproof means, when the tip of the outer rod is caulked, there is a risk that a compressive force exceeding the elastic limit of the sealing elastic ring will be applied to the sealing elastic ring via the collar. In particular, if there are variations in the processed dimensions of the rod, there is a risk that a larger compressive force will be applied. If such a situation occurs, the elastic fatigue of the sealing elastic ring will be severe, and the service life of the multi-stage telescopic rod antenna element will be significantly shortened.

[Purpose of invention]

An object of the present invention is to provide a multi-stage telescopic rod antenna device which can increase the service life of a multi-stage telescopic rod antenna element by reducing elastic fatigue of a sealing elastic ring made of a conductive rubber O-ring or an insulating rubber O-ring. There is a particular thing.

[Summary of the idea]

In order to achieve the above object, the present invention is characterized by the following structure. That is, first rods having different diameters are arranged on the inner circumferential wall of the upper end of each outer rod.
A second step is formed, first and second collars are respectively locked to the first and second steps, and a sealing elastic ring is fitted between the first and second collars. In this state, a locking portion for preventing the collar from coming off is formed on the upper end surface of each of the outer rods.

[Embodiment of the invention] FIGS. 1 and 2 are diagrams showing the structure of an embodiment of the invention, and are longitudinal cross-sectional views showing different parts. 10 in Figures 1 and 2
1 is a housing for housing an antenna element, and the vicinity of its open end is fitted and fixed into a mounting hole 13 provided in a vehicle body wall 12 by an upper mounting member 11a and a lower mounting member 11b. This housing 10 contains a plurality of (in this embodiment, three)
different diameter conductive rod 14a (maximum diameter rod),
14b (intermediate diameter rod), 14c (minimum diameter rod)
A multi-stage telescopic rod antenna element 14, which is slidably connected to each other, is housed in a removably insertable manner. Further, a top portion 15 is attached to the tip of the minimum diameter rod 14c, which functions as a decorative bead or a knob for telescopic operation. Upper mounting member 11a
The housing 10 is held by tightening with a nut 18 via a pad 16 and an insulator 17. Note that a rod insulator 19 is fitted onto the inner circumferential wall of the nut 18. Further, a D-ring 20, a waterproof ring 21, and an O-ring 22 are each fitted into predetermined positions.

FIG. 3 shows the multistage telescopic rod antenna element 14.
FIGS. 4a and 4b are enlarged views of section A in FIG. 3, and FIGS. 5 and 6 are views showing each component, respectively.
As shown in FIG. 5, a first step 23 and a second step 24 having different diameters are formed on the inner peripheral wall of the upper end of the outer rod, for example, the maximum diameter rod 14a. The first and second step portions 23 and 24 are set so that D1<D2, where the diameters of their peripheral walls are D1 and D2. First and second collars 25 and 26 made of "Shinchiyu" or the like are respectively secured to the first and second step portions 23 and 24. Further, between the first and second collars 25 and 26, a sealing elastic ring 27 made of, for example, an O-ring made of conductive rubber is fitted. Further, as shown in FIG. 4b, the upper end surface of the maximum diameter rod 14a is caulked to form a locking portion 28 for preventing the collar from coming off.
is formed to prevent the second collar 26, which is locked to the second step 24, from slipping out when the inner rod, for example, the intermediate diameter rod 14b, slides.

FIG. 7 is an enlarged view of section B in FIG. In the figure, 31 is an O-ring fitted into the housing 10, which connects the maximum diameter rod 14a and the housing 1.
This is for waterproofing in the gap between 0 and 0. Note that 32 is a metal pipe that is integrally fitted into the inner peripheral portion of the housing 10.

In this device configured in this way, since the sealing elastic ring 27 is in close contact with the outer circumferential surface of the inner rod, rainwater etc. cannot enter through the gap between the conductive rods, that is, the gap between the outer rod and the inner rod. There is no fear. Furthermore, since the O-ring 31 is in close contact with the outer peripheral surface of the maximum diameter rod 14a, there is no risk of rainwater or the like intruding through the gap between the maximum diameter rod 14a and the housing 10. In particular, when caulking the tip of the outer rod, the collar 26
4, the sealing elastic ring 2
7, no excessive compressive force is applied. Therefore, the elastic fatigue of the elastic ring 27 can be extremely reduced. Therefore, the multi-stage telescopic rod antenna element 14
The service life of will increase. In addition, the elastic ring 27
Since it is made of conductive rubber, it also has the effect of promoting electrical conductivity between the rods of each stage of the multi-stage telescopic rod antenna device. In addition, when compared with the conventional example, this embodiment requires less work on the first and second step portions 2.
Since only 3.24 counterbore operations are required, there is no risk of a particular rise in manufacturing costs.

Furthermore, among the first and second step portions 22 and 23 formed on the inner circumferential wall of the end portion of the outer rod, the diameter D2 of the second step portion 23 formed on the end portion side is set to the diameter D2 of the second step portion 23 formed on the end portion side.
The diameter is larger than the diameter D1 of No. 2. Therefore, when assembling the antenna, first step 2
2 to lock the first collar 25, then lock the sealing elastic ring 27 to the first collar 25, and then lock the second collar 26 to the second step 23.
The first and second collars 25, 26 and the sealing elastic ring 27 can be easily inserted and assembled by simply locking the outer rod and finally caulking the tip of the outer rod.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, the elastic ring 27 is made of conductive rubber, but it may be made of insulating rubber. In addition, various modifications can be made within the scope of the gist of the present invention.

[Effect of idea]

As described in detail above, according to the present invention, first and second step portions having different diameters are sequentially formed on the inner circumferential wall of the upper end of each outer rod, and the first and second step portions have first and second step portions, respectively, which have different diameters. , with the second collar locked and a sealing elastic ring fitted between the first and second collars, a locking part for preventing the collar from coming off is formed on the upper end surface of each of the outer rods. I decided to do this, so
To provide a multi-stage telescopic rod antenna device that has little elastic fatigue on a sealing elastic ring made of a conductive rubber O-ring or an insulating rubber O-ring, can increase the service life of a multi-stage telescopic rod antenna element, and can be manufactured at low cost and easily. can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal cross-sectional views showing the configuration of an embodiment of the present invention cut at different parts, respectively;
Fig. 3 is a partial cross-sectional view showing a part of the rod antenna element, Fig. 4 a and b are enlarged views of section A in Fig. 3, Fig. 5 is a partially enlarged view of the conductive rod, Figs. b is a cross-sectional view of the elastic ring and collar, 7th
The figure is an enlarged view of section B in FIG. 10...Antenna element storage housing, 14
...Multi-stage telescopic rod antenna element, 14a-14
c... Conductive rod, 23... First step, 24
...Second stepped portion, 25...First collar, 26...
...second collar, 27...elastic ring for sealing,
28... Locking part for retaining the collar, 31... O-ring.

Claims (1)

[Scope of utility model registration request] A multi-stage telescoping rod antenna element in which a plurality of conductive rods of different diameters are slidably connected to each other, and each outer rod of this multi-stage telescoping rod antenna element has diameters successively varied on the inner circumferential wall of the upper end of each outer rod such that the diameter is larger on the end side. first and second step portions formed by the first and second step portions, first and second collars respectively locked to the first and second step portions, and fitting between the first and second collars. 1. A multi-stage telescopic rod antenna device, comprising: an elastic ring for sealing the outer rod; and a locking portion for preventing the collar from coming off, formed on the upper end surface of each of the outer rods.