JPH0145145Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an antenna element using terminal fittings, and more specifically, it is easy to conduct conductive processing.
This invention relates to an antenna element with excellent conductivity and durability.

Generally, in antenna elements using a so-called carbon fiber reinforced plastic tube with carbon fibers arranged in the middle, a hole is bored in the reinforced plastic tube as a conductive treatment, and the outer plastic tube layer around the hole is scraped off. exposing the carbon fiber layer,
After applying a conductive adhesive to the inner surface of the hole, the surface of the carbon fiber layer, and the inner surface of the reinforced plastic tube around the hole, a so-called blind rivet is attached to the hole to make the carbon fiber layer and blind rivet conductive. I have to.

That is, Figures 1 to 3 show conventional antenna elements, and in terms of shape, in addition to the U-shaped tube shape shown in the figure, there are straight tube shapes and other curved tube shapes, and antenna elements are made of plastic such as epoxy resin and polyester resin. A so-called carbon fiber-reinforced plastic tube 1a is used in which an inner tube layer 2a is formed, a carbon fiber layer 7a is overcoated thereon, and an outer tube layer 3a made of fiber-reinforced plastic is further layered. In the case of such an antenna element, conductive processing of the internal carbon fiber layer 7a is carried out by drilling a hole 5a in the plastic tube 1a and also forming a hole 5a in the plastic tube 1a.
The carbon fiber layer 7a is exposed to the outside by cutting and removing the outer tube layer 3a around the carbon fiber layer 7a.
After applying a conductive adhesive 6a to the surface, the inner surface of the hole 5a, and the inner surface of the inner tube layer 2a, the blind rivet 4a is attached to the hole 5a as shown by imaginary lines.

Blind rivets are conventionally used to join parts to products where the operator's hands and jigs cannot enter inside the product, and blind rivets can be used manually, electrically, or The work can be completed simply by using air-based tools. The rivets used for blind rivets are
It consists of a cylindrical body having a large-diameter head at its outer end, and a rod-shaped core metal having an engaging portion that fits inside the cylindrical body and engages with the inner end surface of the cylindrical body. This rivet is fitted into the hole 5a from the outside, and by pulling the core metal outward with a tool, the inner end of the cylinder is expanded by the engaging portion, and the member is clamped between the outer head and the outer head.

As a result, the carbon fiber layer 7a inside the antenna element becomes electrically conductive with the blind rivet 4a, making it possible to supply power as an antenna. Not only will the strength around the carbon fiber layer 5a be reduced, but the carbon fiber layer 7a will be partially exposed to the outside, resulting in deterioration of the area and impeding conductivity during long-term use. There was a problem. In addition, in the case of an antenna element having a U-shape as shown in the drawing, for convenience of cutting the outer tube layer 3a, the straight tube portions 8, 8 and the bent tube portion 9 are manufactured separately, and the straight tube portion 8 is processed by the above-described processing. The processing is not so difficult since both 8 and 9 are integrally joined with adhesive after
However, in the case of integrated U-shaped elements that will be used frequently in the future, that is, those in which the straight pipe parts 8, 8 and the bent pipe part 9 are integrally molded from the beginning, the above processing is not performed on the straight pipe itself. Since this must be done on a curved pipe whose overall shape is U-shaped, it is extremely difficult to set the element in a cutting machine such as a lathe and cut the outer pipe layer 3a. It is.

This invention solves the above problems with conventional antenna elements, and allows conductive processing to be performed extremely easily.
Moreover, it provides an element with excellent conductivity and durability, and its gist is that it is a plastic tube with a conductive layer interposed between the inner tube layer and the outer tube layer, near the end of the plastic tube. A hole for mounting a rivet is made, and a certain length of the end of the plastic inner tube layer is removed to expose the conductive layer, and the conductive layer is placed on top of the approximately C-shaped mounting ring or extending from one end of the top of the mounting ring. A terminal fitting having a short cylindrical ring with a through hole formed in it protruding from the upper part of the bent curved washer is inserted into the plastic tube, and the short cylindrical ring is inserted into the hole in which the rivet is attached to connect it to the conductive layer exposed inside. The antenna element is arranged in

That is, the present invention can be implemented not only in a so-called carbon fiber-reinforced plastic tube but also in a plastic tube having a conductive layer other than carbon fiber inside, preferably a fiber-reinforced plastic tube. The present invention is designed to completely or partially remove the end of the tube layer to expose the conductive layer, and to conduct electricity between the exposed conductive layer and a blind rivet that is attached to a hole drilled in the plastic tube. A unique terminal fitting is inserted into a plastic tube, and a conductive material is interposed between the conductive layer and the terminal fitting to improve adhesion.

As a result, the area around the hole in the plastic tube is simply a hole in which both the inner and outer tube layers have not been removed.
Moreover, since the terminal fittings are applied from the inside of the plastic tube, the strength of the plastic tube is sufficiently maintained, and the conductive layer is not exposed to the outside, so that it can withstand long-term use without being exposed to wind and rain. Further, since the inner surface of the end of the plastic tube is cut and removed to expose the conductive layer, processing is extremely easy, and even an antenna element having an integrally formed U-shape can be easily processed.

Hereinafter, embodiments of the antenna element according to the present invention will be explained in detail based on the drawings illustrating the embodiments. Figures 6 and 7 are vertical cross-sectional views of the plastic tube end of the antenna element of the present invention, such as a U-shaped tube or a straight tube. 1 is a plastic tube such as a carbon fiber reinforced plastic tube, a conductive layer 7 such as a carbon fiber layer is interposed between a plastic inner tube layer 2 and an outer tube layer 3, and 5 is a blind rivet 4. It is simply a through hole for attaching. Accordingly, in the present invention, the end portion of the inner tube layer 2 of the plastic tube 1 is cut off by a certain length l to expose the inner conductive layer 7. As shown in the figure, the exposed conductive layer 7 and the inner surface of the unremoved end of the plastic inner tube layer 2 reaching the hole 5 are coated with a conductive adhesive 6, or the conductive layer 7 is coated as shown in FIG. The coating is applied only to the inside surface. In this embodiment, a case where a conductive adhesive 6 is used will be described, but the conductive adhesive 6 is not limited to the use of paint, coating agent, etc.
Contains zinc powder and other conductive substances.

On the other hand, FIGS. 4 and 5 show a terminal fitting 19 to be inserted into the plastic tube 1 processed as described above, and the terminal fitting 19 is a substantially C-shaped metal mounting ring 15 with the lower part open as shown in FIG. A short cylindrical ring 18 with a through hole 17 formed in the upper part is provided protrudingly, and a through hole 17 is formed in the upper part of a curved washer 16 extending from one end of the upper part of the approximately C-shaped mounting ring 15 as shown in FIG. Examples include those with a protruding short cylindrical ring 18. The terminal fitting 19 is inserted into one end of the processed plastic tube 1, and in the case of the terminal fitting 19 shown in FIG. 4, the entire terminal fitting 19 is inserted into the plastic inner tube layer 2 as shown in FIG. the short cylindrical ring 18 is fitted into the hole 5 of the plastic tube 1.
In this case, since the mounting ring 15 is substantially C-shaped and has elasticity, the terminal fitting 19 is sufficiently closely fitted into the plastic tube 1 and will not come off. Further, the conductive adhesive 6 is applied to the exposed conductive layer 7 and the terminal fitting 19.
This results in a sufficient electrical connection between the two and a good conductive state. After the conductive adhesive 6 is applied, the terminal fitting 19 may be inserted after being cured, or the terminal fitting 19 may be inserted and hardened immediately after being applied, so that the conductive layer 7 and the terminal fitting 19 are bonded together. What is necessary is to make it conductive by using a conductive adhesive 6.

In addition, in the case of the terminal fitting 19 shown in FIG. 5 shown as another embodiment, the curved washer 16 portion is placed in the inner tube layer 2 and the short cylindrical ring 18 is fitted into the hole 5 as shown in FIG. The mounting ring 15 is not inserted into the inner tube layer 2, but is elastically arranged on the inner surface of the conductive layer 7 at the end of the inner tube layer 2. In this case, the conductive adhesive 6 is interposed between the conductive layer 7 and the mounting ring 15 to improve conductive contact between the two 7 and 15. 2 may also be coated with a conductive adhesive 6. Further, it is not necessarily necessary to use the conductive adhesive 6 as long as the mounting ring 15 is brought into close contact with the conductive layer 7 with sufficient elasticity.

It should be noted that the descriptions of "upper" and "lower" in the present invention are merely a positional relationship in the drawings, and it goes without saying that they do not necessarily correspond to the actual vertical relationship in use.

The structure of the antenna element of the present invention is as described above, and FIGS. 10 and 11 show an example of its mounting and usage state. That is, 10 is a holder for inserting and holding a plastic tube 1 which is an antenna element, and has an insertion hole 11 having an inner diameter approximately equal to the outer diameter of the plastic tube 1. is set in the insertion hole 11. Further, a rivet hole 12 having approximately the same diameter as the hole 5 is formed through the upper surface of the holder 10, and a so-called blind rivet 4 is inserted into the rivet hole for the antenna element set in the insertion hole 11 as described above. 12, the plastic tube 1 is inserted through the hole 5, and its lower end is expanded as shown in the figure. 13 is a conductive plate;
It is located between the holder 10 and the blind rivet 4, and has a conductive wire 14 connected to one end thereof. What is shown in FIGS. 10 and 11 is an example of the usage state of the antenna element of the present invention, and the present invention can be implemented in various usage states in which a blind rivet 4 is attached to the antenna element to supply power. be able to.

Blind rivets are conventionally used when attaching components to products where the operator's hands and jigs cannot enter inside the rivet.・The work can be completed only by operating electric or pneumatic tools. The rivet used for blind rivets consists of a cylindrical body with a large-diameter head on its outer end, and a rod-shaped core metal that fits inside the cylindrical body and has an engaging part that engages with the inner end surface of the cylindrical body. Become. This rivet is fitted into the hole 5 from the outside, and by pulling the core metal outward with a tool, the inner end of the cylinder is expanded by the engaging portion, and the member is held between the outer head and the outer head.

In the antenna element of the present invention constructed as described above, as shown in FIGS.
It is maintained in a good conductive state via the conductive adhesive 6, and power is supplied to the conductive wire 14 through the blind rivet 4 and the conductive plate 13. In particular, in the present invention, the terminal fitting 1 has the lower part of the blind rivet 4 disposed inside the antenna element.
9, and the conductive layer 7
is connected to the terminal fitting 19 directly or indirectly through the conductive adhesive 6, forming a highly sensitive and good conductive path, which is inside the antenna element and around the hole 5. Since the terminal fitting 19 is located and its short cylindrical ring 18 is fitted into the hole 5 and reinforced, local breakage of the plastic tube 1 is prevented,
It has excellent durability and weather resistance, suppressing changes in contact resistance due to wind pressure vibrations, etc. when using the antenna, and preventing deterioration of electrical characteristics.

In addition, on the processing surface, the hole 5 can be formed by simply drilling a through hole, and there is no need to perform any troublesome cutting work around the hole 5. Since the antenna element is exposed, it is extremely easy to process compared to the conventional case, and even if the element is integrally formed into a U-shape, it can be easily processed, and the completed antenna element will not have any structural strength. It can function well for a long time without any problems.

As described above, the present invention provides a plastic tube in which a conductive layer is interposed between the plastic inner tube layer and the outer tube layer, and a hole for attaching a rivet is bored near the end of the plastic tube. A short cylindrical ring is formed by removing a certain length of the end portion to expose the conductive layer, and forming a through hole in the upper part of the approximately C-shaped mounting ring or in the upper part of the curved washer extending from one end of the upper part of the mounting ring. The protruding terminal fitting is placed inside the plastic tube, and the short cylindrical ring is inserted into the hole for attaching the rivet and connected to the conductive layer exposed inside, thereby forming an antenna element. The element can be manufactured easily and has excellent conductivity, durability, and weather resistance.

In addition, the present invention connects the exposed conductive layer and the terminal metal fittings placed inside the plastic tube through a conductive material, which allows for good adhesion and sufficient electrical connection to maintain a good conductive state. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional U-shaped antenna element, Fig. 2 is an enlarged sectional view taken along line A-A' in Fig. 1, Fig. 3 is an enlarged sectional view taken along line B-B' in Fig. 1, and Figs. A perspective view of the terminal fitting used in the invention, Figures 6 and 7 are longitudinal sectional views of the end of the plastic tube in the antenna element of the invention, and Figures 8 and 9 show the end of the antenna element of the invention with the terminal fitting attached to the plastic tube. FIGS. 10 and 11 are cross-sectional views showing the installed state of the antenna element of the present invention. 2...Plastic inner tube layer, 3...Outer tube layer, 7
...Conductive layer, 1...Plastic tube, 4...Blind rivet, 5...Hole, l...Constant length, 15
... Mounting ring, 16 ... Curved washer, 17 ... Through hole,
18... Short cylindrical ring, 19... Terminal fitting, 6... Conductive adhesive (conductive substance).

Claims (1)

[Claims for Utility Model Registration] (1) A hole for attaching a rivet is bored near the end of a plastic tube with a conductive layer interposed between the plastic inner tube layer and the outer tube layer, and The conductive layer is exposed inside by removing a certain length of the end of the tube layer, and a through hole is formed in the upper part of the approximately C-shaped mounting ring or in the upper part of the curved washer extending from one end of the upper part of the mounting ring. An antenna element comprising a terminal fitting with a protruding cylindrical ring disposed within the plastic tube such that the short cylindrical ring is inserted into a hole for attaching a rivet and connected to a conductive layer exposed inside. (2) The antenna element according to claim 1 of the utility model registration, in which the exposed conductive layer and the terminal metal fitting arranged inside the plastic tube are connected with a conductive substance interposed therebetween.