JPS58968Y2 - Grounding mechanism of vehicle antenna - Google Patents

Description

[Detailed description of the invention] The present invention relates to the invention of a grounding mechanism for a vehicle antenna, which simplifies the installation of the antenna to the vehicle body, establishes an accurate grounding connection, and makes it stable. The objective is to obtain a mechanism that is strong, has a good appearance, is easy to manufacture a mounting base, eliminates causes of corrosion, and has high durability.

In order to ground a vehicle antenna, a ground plate is embedded in an insulating mounting base for attaching the antenna element to the vehicle body, and a screw is used to attach the mounting base to the vehicle body surface to connect the ground plate to the vehicle body. It has been conventional practice to ground between the

However, when using this mechanism, the earth connection is made using a small screw, so it is not necessarily possible to obtain a stable and accurate earth connection. The antenna element group is subject to vibrations when the vehicle is running under the action of a large load, and this vibration always affects the mounting screw portion, so there is a strong tendency for the electrical performance of this portion to deteriorate.

Furthermore, since the above-mentioned mounting base is generally attached to the vehicle body using multiple mounting screws, the installation operation is not easy, and such mounting screws are susceptible to corrosion due to moisture such as rain and dew. Although the use of mounting screws made of synthetic resin or coated with synthetic resin is the reason for achieving highly durable installation, such mounting screws cannot be used for the above-mentioned grounding. Therefore, there is a high possibility of corrosion.

For this purpose, for example, as in Japanese Utility Model Publication No. 50-2493, a locking flange is formed on a flexible cylindrical insertion part protruding from the mounting base for introducing the power supply line and inserting the vehicle body mounting hole into the vehicle body mounting hole. It has also been done to lock the insertion part to the edge, but in this case, since the insertion part is flexible, the locking and fixing by the locking collar cannot be stably achieved. Since the raised part must be formed on the locking flange and the bulge must be pressed against the fastening part and screwed in place, the installation is difficult and difficult to operate. There is a drawback that mold cutting is complicated and the number of man-hours for manufacturing increases when manufacturing the synthetic resin mounting base.

Of course, since the mounting screw also serves as a ground, there is a high possibility of corrosion as mentioned above.

The present invention was devised through research to eliminate the disadvantages and shortcomings of the conventional ones as described above, and the embodiment thereof is explained as shown in the attached drawings. An insulating tube 4 in which the base end of the antenna base tube 10 to which the core wire of the feeder line is attached is attached to an insulating mounting base 1, and the feeder line 3 is housed inside the joint surface 2 of the mounting base 1. The insulating tube 4 is installed by inserting it into the insertion hole 6 formed in the vehicle body wall 5, and is connected to the coated conductor layer of the power supply line 3 in the mounting base 1 as described above. Although it is the same as the conventional one, in the present invention, a bent part 8 is formed at one end of such a grounding plate 7 so that the grounding plate 7 is placed inside the mounting base 1 from the joint surface 2. The protruding portion 14 is made to protrude upward, and the tip of the protruding portion 14 is further bent to form a bent portion 9 that locks onto the vehicle body. A mount 12 is attached to a position corresponding to the other end of the plate T, and the mount 12 is screwed into the vehicle body wall 5 for fixation.

In the drawing, 13 is a recessed hole for inserting the mount 12,
Reference numeral 15 denotes a cut formed in the ground plate 1, and the protrusion 14 as described above is formed at the center of one end of the ground plate 1 with this cut 15.15. Finger-shaped protrusions 16 are provided oppositely on both sides of 14, respectively.

According to the present invention as described above, the protruding portion 14 formed with the locking bent portion 9 as described above is inserted into the insertion hole 6 of the vehicle body wall 5 together with the insulating tube 4, as shown in FIG. By tightening the mount 12 while the locking bent portion 9 is locked to the inner surface of the vehicle body wall 5, the rigid metal locking bent portion 9 is firmly pressed against the vehicle body wall 5. As a result, an accurate ground connection relationship with the vehicle body wall 5 can be formed.

Moreover, even if such a mounting is tightened by a single mount 12, the locking bent portion 9 as described above is joined to the inner surface of the vehicle body wall 5, and the protruding portion 14 is locked in the insertion hole 6. Because of this relationship, it is extremely strong and stable.In other words, even if the vehicle is driven under a long load condition with the antenna element group 11 extended and vibration is applied, the vibration will have almost no effect on this mounting part. A strong attachment that is not given to the condition can be easily formed.

In addition, since the mount 12 is just a mount and does not have the purpose of connecting to earth, it is possible to use a synthetic resin type or other material that is resistant to rain and dew and does not corrode.
As a result, a highly durable installation can be achieved, and since only one mount 12 is required and there is no corrosion, a good-looking mount can be formed.

When manufacturing the mounting base 1, the insulating tube 4 can be simply cylindrical, so it can be easily cut out and manufactured easily.Moreover, since the insulating tube 4 is used only for the simple purpose of introducing a power supply line, no special work is required. A favorable protection effect is obtained for unnecessary and introduced power supply lines.

As described above, the device of the present invention uses the ground plate γ itself to attach to the car body wall, which simplifies the mounting structure to the car body wall, completes the ground connection, and allows the antenna mechanism to be attached to the car body wall. 5, it simplifies the installation and also ensures sufficient stability and firmness.
In addition, it is possible to use a material such as synthetic resin for the mount 12, which eliminates the cause of corrosion, and makes it possible to provide equipment with good appearance and high durability, which is a highly effective idea from an industrial perspective.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view showing the device according to the present invention attached to a wall of a vehicle body, and FIG. 2 is a plan view of the ground plate portion thereof. However, in these drawings, 1 is a mounting base made of insulator,
2 is the joint surface thereof, 3 is the power supply line, 4 is the insulating cylinder, 5 is the car body wall, 6 is the insertion hole, 7 is the ground plate, 8 is the bent part, 9
10 is an antenna base tube, 11 is an antenna element, 12 is a mount, and 14 is a protrusion.

Claims (1)

[Scope of utility model registration request] The base end of the antenna base tube, on which the antenna element group is attached in a telescopic manner, is attached to a mounting base made of an insulator, and the core wire connected to the antenna base tube and the outer conductor connected to the ground plate are attached to the joint surface of the mounting base. An insulating tube is installed by inserting a protruding insulating tube into which a power supply line is housed, and the insulating tube is inserted into an insertion hole formed in the wall of the vehicle body. A bent part is formed at one end of the plate to form a protruding part that protrudes from the joint surface on one side of the insulating tube that is attached to the mounting base, and the tip of the protruding part is further bent outward to form a part that is attached to the vehicle body. A grounding mechanism for a vehicle antenna, in which an IE bent portion is provided, and a separate mount for a vehicle body is provided at the other end of the grounding plate.