JPH0342731Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a grounding fitting for an on-vehicle antenna that is brought into contact with the body of a vehicle such as an automobile.

[Conventional technology]

No. 4 for the grounding metal fittings of conventional car antennas.
This will be explained with reference to FIG.

As shown in FIG. 4, the antenna body 2 of the vehicle-mounted antenna is inserted into the mounting hole formed in the vehicle body 1, and the tip of the antenna body 2 is attached to the outside of the mounting seat 3 and cap 4 fitted to the antenna body 2. By protruding and tightening the tightening nut 5 on this protrusion, the body 1 is sandwiched from the outside and the inside between the nut 5 and the grounding fitting 6 fitted and fixed to the antenna body 2, and the antenna body 2 is attached to the body 1. It is being fixed.

In addition, the grounding fitting 6 which also serves as a mounting fitting used in this case is made of a die-cast metal product and integrally forms the flange 6a and the cylindrical body 6b, as shown in FIG. A large number of small protrusions 6c with sharp tips protrude in a jagged manner from the facing contact surfaces, and by bringing these small protrusions 6c into contact with the body 1, the antenna is grounded.

[Problem that the invention attempts to solve]

Recently, in the bodies of vehicles such as automobiles, the steel plate 1b has become thinner, but the anti-rust paint layer 1a applied to the steel plate 1b has become thicker and more durable. If the small protrusions 6c are protruded, the force applied during tightening will be dispersed, making it difficult to break the paint layer 1b and bite into the steel plate 1a of the body 1.
There was a problem in that grounding failures often occurred. Therefore, some long sharp claws are installed in a small number of places, such as 3 or 4, on the contact surface of the grounding metal fitting to the body, and these claws dig into the steel plate of the body to ensure that the earth is properly grounded. However, this causes the curved surface of the body to deform when the tightening nut is tightened, causing the antenna side to no longer come into close contact with the body, or applying excessive force to the antenna, making it difficult to extend or retract the telescopic rod antenna element. There was a problem that defects occurred.

The present invention solves the above-mentioned problems and provides a vehicle-mounted device that can be grounded reliably, does not deform the vehicle body, and does not interfere with antenna installation or operation. The purpose is to provide grounding fittings for antennas.

[Means for solving problems]

The grounding fitting for the in-vehicle antenna according to the present invention is
A large number of small protrusions with sharp tips are provided on the surface that contacts the vehicle body, and some of these small protrusions serve as tall, sharp biting claws.

[Effect]

In the grounding fitting according to the present invention, a part of the small protrusion is formed into a high sharp biting claw, so when the tightening nut is tightened, the biting claw breaks the paint layer of the body and bites into the steel plate, thereby preventing biting. The biting claws ensure that the ground is established, and at least a portion of the small protrusions other than the biting claws touch the body, so the biting claws do not dig into the body beyond the extent that they do not deform the body or hardly deform it. Therefore, it is possible to prevent malfunctions in antenna installation and operation due to deformation of the body.

〔Example〕

Below, Figures 1 to 3 will be explained for one embodiment of the present invention.
This will be explained with reference to the figures.

As shown in FIGS. 1 and 2, the grounding fitting 6 of this embodiment is similar to the conventional one shown in FIG.
A large number of small protrusions 6c with sharp tips are protruded in a jagged manner on both sides of the contact surface of the collar 6a provided at the tip of the cylindrical body 6b at an angle to the body 1. In addition, a total of two biting claws 6d are disposed at intermediate portions between the small protrusions 6c corresponding to the axis of the antenna, one at each location facing each other. The biting claw 6d is formed so that the dimension a in the circumferential direction of the base is the same as that of the other small protrusions 6c, and is larger than the small protrusion 6c depending on the thickness of the paint layer 1a.
It is sharpened by increasing the height by about 0.3 mm to 0.5 mm, and is formed integrally with the flange 6a in a conical or pyramidal shape.
Alternatively, a separate piece is fixed to the flange 6a.

Note that the configuration of this embodiment other than the above-mentioned is the fourth
It is similar to the conventional one shown in FIG. 1 and FIG. 5, and the same reference numerals as in FIG. 4 in FIG.

The earthing fitting of the embodiment is used in the same manner as the conventional use shown in FIG.
To ground the antenna, the small protrusions 6c other than the biting claws 6d hit the inner surface of the body 1 and support the grounding fitting 6 to the body 1 without biting into the steel plate 1b. In this case, as shown in FIG. 3, long biting claws 6d are arranged at two locations corresponding to the axis of the antenna, and an angle θ is provided between the vehicle body 1 and the flange 6a. A
- The rotation angle can be taken in the A direction, and there is no distortion in the outer tube of the antenna body or the antenna element.

In addition, in the present invention, the number and position of the biting claws are not necessarily limited to those in the embodiments, such as having one biting claw, and the line connecting the tips of the small protrusions corresponds to the contact surface of the body, and the small protrusions The small protrusion may be formed so that the angle θ = 0 in Fig. 3, where the entire part contacts the body.
If the use is pressed against the inner surface of the body, the fourth
It can be used without being limited to the antenna shown in the figure and the structure for fastening this antenna to the vehicle body.

[Effect of idea]

As explained above, in the grounding fitting according to the present invention, some of the many small protrusions provided on the surface that abuts against the vehicle body are made into high sharp biting claws, so that the grounding fitting is pressed against the inner surface of the body. When the device is damaged, the biting claws break through the paint layer on the body and bite into the steel plate, ensuring a reliable grounding and thus preventing noise from being generated in radios, etc. that use antennas. In addition, at least a part of the small protrusions other than the biting nails come into contact with the body to prevent the biting nails from biting excessively, thereby eliminating or almost eliminating deformation of the body due to the biting nails. This has the effect of preventing antenna installation defects and malfunctions.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing a grounding fitting of an in-vehicle antenna according to an embodiment of the present invention in a state of use; FIG. 2 is a perspective view of the grounding fitting shown in FIG. 1;
Fig. 3 is an explanatory diagram of the same action, Fig. 4 is a partially sectional side view showing a conventional grounding fitting in a state of use, and Fig. 5
The figure is a perspective view of the grounding fitting shown in FIG. 4. 1...Body, 1a...Paint layer, 1b...Steel plate, 2...Antenna body, 3...Mounting seat, 4...
Cap, 5...tightening nut, 6...earth metal fitting, 6a...flange, 6b...cylindrical body, 6c...small protrusion, 6d...biting claw.

Claims (1)

[Claims for Utility Model Registration] (1) A vehicle is characterized in that a number of small protrusions with sharp tips are provided on the surface that contacts the vehicle body, and some of these small protrusions are formed into high, sharp biting claws. A grounding fitting for an in-vehicle antenna. (2) The grounding fitting for an in-vehicle antenna according to claim 1 of the utility model registration, wherein the biting claw is formed at a position corresponding to the axis of the antenna. (3) The biting claws are located at two opposing locations among the multiple small protrusions.
A grounding fitting for an in-vehicle antenna according to item 1 or 2. (4) The small protrusions, including the biting claws, have the same base size, and the biting claws are made taller and sharper. Grounding metal fitting for vehicle antenna. (5) The small protrusions other than the biting claws are formed in a curved line that corresponds to the contact surface of the vehicle body.
A grounding fitting for an in-vehicle antenna according to item 3 or 4.