JPH0448003Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" The invention relates to a multi-stage sleeve antenna, in which the connection between radiators is fixed independently at each connection part, and the mechanical load for connecting the radiators is transferred to the core. The purpose is to provide a stable multi-stage sleeve antenna with no variation in antenna characteristics by preventing direct action and by reinforcing the connection portions.

(Industrial field of application) A mechanism for connecting and fixing each radiator in a multi-stage sleeve antenna element.

(Prior art) The structure used to connect and fix each radiator in a multi-stage sleeve antenna is
As shown in the figure, the fixing bracket 1 is attached to the base end of the power supply side.
6 and the core wire 11a with the core wire connection fitting 17 attached.
A coaxial core 11 is formed with an insulator 11b, and a collar 13 and a radiator 1 are attached to the core 11.
2a, 12b, and 12c are inserted and assembled into the antenna cover 15, and the tip of the core wire 11a of the core 11 is soldered 14 to the center of the radiator 12a, and each collar 13 insulates the radiators from each other in the middle. A plate-like portion 13a is formed, and the plate-like portion 13a is
The cylindrical collar 1 is a cylindrical member made of an insulating material and has an insertion hole for the core 11 formed therein.
3 and 13 are covered with an antenna cover 15 on the outside thereof.

(Problem to be solved by the invention) However, in the conventional device as described above, the connection (strong connection) between the radiators is made by connecting the core wire 11a in the core 11 and the radiator 12 as described above.
a or the connecting fitting 17 with a small amount of soldering 1
4, and the radiators 12a~
Since the connection load at 12c is concentrated on the small soldered portion 14 at the center, sufficient mechanical strength of the connection cannot be obtained.

In addition, the adhesion between the radiators connected at the collar 13 is insufficient and unstable as there is no restraint around the radiator during vibration or bending, which also affects the antenna characteristics. There is a disadvantage in that variations in antenna characteristics cannot be avoided due to external mechanical forces such as vibration and bending.

Further, since the collar 13 is cylindrical, the antenna cover 15 covering the outside of the collars 13, 13 having the same diameter cannot be tapered. In other words, for this kind of antenna cover that has a certain length and requires a long length, it is recommended to have a slightly larger diameter at the base end and taper it to a smaller diameter toward the tip for strength and wind pressure resistance. Although it is preferable, if such a taper is adopted in the antenna cover 15 which is simply joined and assembled to the outside of the cylindrical collars 13, 13 as described above, there will be a gap between the antenna cover 15 and either collar. This inevitably occurs, and proper assembly cannot be achieved.

"Structure of the invention" (Means for solving the problem) A core 1 formed coaxially with a core wire 1a connected to a power supply line in the center and an insulator 1b is inserted between the radiators 2 and 2, and an insulator is inserted between the radiators 2 and 2. 3, a flange 2a is formed at the joint end of the radiators 2, 2, respectively, and stepped portions 5a, 6a are provided to be joined to the flange 2a via a sealing material 7. The engaging collars 5 and 6 are arranged oppositely, and the engaging collars 5 and 6 are arranged oppositely.
On one side 6 are the respective flanges 2a and the insulator 3 described above.
A cylindrical interposed part 6c is formed extending and positioned between the other engaging collar 5, and a locking step 6b is engaged with and disengaged from the hook part 5c formed on the other engaging collar 5. A multi-stage sleeve antenna characterized by the following:

(Function) The step portions 5a, 6a of the engaging collars 5, 6, which are disposed opposite to each other via the sealing material 7, are joined to the collar portion 2a formed at the joining end of the radiators 2, 2 to be connected, By engaging both the engaging collars 5, 6 at the hook portion 5c and the locking stage 6b, a direct and stable connection is mechanically formed between the outsides of the radiators.

Each flange 2 of each radiator 2 is attached to one of the engagement collars 5 and 6, which is the engagement collar 6.
a and the cylindrical interposed part 6c extending and positioned between the insulator 3 interposed between the collar parts 2a and the other engaging collar 5, the ends of each radiator 2 and The connection is completed under the condition that the relative position of the insulator 3 interposed between these end portions is properly maintained on the circumferential side, and the overall assembly relationship is stabilized.

The one engagement collar 6 is connected to the other engagement collar 5.
A locking stage 6b that engages with and disengages from a hook portion 5c formed in the
By forming this, the two engaging collars 5 and 6 are locked and connected at their outer peripheries while maintaining proper relative positions as described above.

In addition, by arranging the cut 8 on the hook portion 5c side of the other engagement collar 5 in which the hook portion 5c is formed, an elastic action can be given to the hook portion 5c side, and such a hook portion 5c The elastic action of the sides facilitates the engagement and disengagement operation between the above-mentioned two engagement collars 5 and 6, and also improves the connection with the antenna cover 4 covered on the outside of each connected radiator 2. It is considered good.

(Example) To explain the specific embodiment of the above-mentioned device according to the present invention shown in the attached drawings, it is as shown in FIGS.
An antenna in which an insulator 3 is interposed between the ends of radiators 2 and 2 including an outer conductor 2' inserted through a core 1 made coaxial with an insulator 1b, and power is supplied from the lower end side of the core 1. A part of the radiator 2 is formed with a flange 2a at the end of each of the radiators 2, 2, and is engaged with each of the radiators 2a by interposing a sealing material 7 such as an O-ring. They are connected by collars 5 and 6. That is, these engaging collars 5 made of an insulating material such as synthetic resin,
Reference numeral 6 includes a stepped portion 5a or 6a in the intermediate portion that faces the flange portion 2a and exerts a tightening action on the sealing material 7.
One of the engaging collars 5 has a hook portion 5c formed on the distal end side of the step portion 5a via the outer extending portion 5b, and the hook portion 5c is formed between the outer extending portion 5b and the hook portion 5c. A recessed portion 5d for receiving the locking stage 6b of the other engagement collar 6 is formed between the two. Further, the other engaging collar 6 has a stepped portion 6 as described above.
a is formed on the inside, and the above-mentioned locking step 6b is provided protruding outward, and the above-mentioned flange portions 2a, 2a are formed inside the engagement collar 5 from an intermediate portion between these step portions 6a and the locking step 6b. A cylindrical interposed part 6c is located on the outside and projects along the axial direction.

In addition, in this embodiment, a cut 8 slanted in the axial direction of the engaging collar 5 is formed at the outside extending portion 5b or the hook portion 5c of the engaging collar 5 as shown in FIG. The hook portion 5c is provided with a spring action when the hook portion 5c is engaged with and disengaged from the locking step 6b, and a protrusion portion 9 is provided on the outside of the hook portion 5c in an annular or partial shape. The protruding portion 9 provides a first
As shown in the figure, it is configured to be joined and set to the inner surface of the antenna cover 4.

In other words, it is clear that the operational relationship of the protrusion portion 9 is that it acts as a spring when the hook portion 5c is engaged with and disengaged from the locking stage 6b as described above, but this is not the same. On the other hand, when these engaging collars 5 and 6 are inserted into the antenna cover 4, they undergo changes as shown as A and B in FIG. 3, that is, the hook portion 5c as shown in FIG.
From the state in which the inner surface of the locking step 6b is joined with a gap formed between the inner surface and the outer surface of the locking step 6b, the gap no longer exists as shown in FIG. The diameter can be changed to a small diameter state. In other words, the inner diameter of the antenna cover 4 may vary in this way, and even if the antenna cover 4 has a constant inner diameter or is formed into a tapered shape, the inner diameter of the antenna cover 4 can be appropriately tolerated in terms of insertion. It is something to do.

Further, in the case of the present invention in which a cylindrical interposed part 6c is formed in the engagement collar 6, the cylindrical interposed part 6c is interposed together with each end of the radiator 2, 2 to be connected. The insulators 3 are assembled in a predetermined relationship, and under such assembly conditions using the cylindrical interposed part 6c, the other engagement collar 5 covers the cylindrical interposed part 6c and attaches to its base. Since the hook portion 5c is locked to the formed thick locking step 6b, a very strong and stable connection can be formed. Moreover, such a cylindrical interposed part 6c sufficiently covers the area where the above-mentioned cutout 8 is disposed, and together with a sealing material such as an O-ring, sufficiently ensures watertightness in important element parts.

A recessed portion 5d formed adjacent to the hook portion 5c at the tip of the engagement collar 5 receives the locking step 6b, and also thins the hook portion 5c side to provide elasticity, and in combination with the cutout 8. The hook portion 5c is made elastic both in the outer radial direction and in the inner radial direction. That is, when the engaging collar 5 is slid along the radiator 2, it can be automatically locked to the locking step 6b due to the elastic action of the hook portion 5c in the outer diameter direction, thereby facilitating the connection operation. Furthermore, it is clear that the elastic action of the hook portion 5c in the inner diameter direction provides an action that quickly responds to changes in the diameter of the antenna cover 4 as shown in FIG.

``Effect of the invention'' According to the invention as explained above, the radiators that are connected to each other by inserting the core can be connected to each other at each connection part, and the connection between the radiators is achieved at the outer part, so that the radiators are connected to the core. In addition, since the connection between these radiators can be made robust and strong at the outer peripheral portion as described above, and can be connected with particularly favorable adhesion, the antenna characteristics will not be affected. It has the effects of reducing the influence, achieving stable multi-stage sleeve antenna characteristics with little variation, and making the connection and assembly operations considerably easier, and is a highly effective idea in practical terms. .

[Brief explanation of drawings]

The drawings show the technical contents of the present invention, in which Fig. 1 is a side view showing the disassembled state of the connecting mechanism according to the present invention, Fig. 2 is a sectional view of the connecting mechanism according to the invention in an engaged and connected state, FIG. 3 is a cross-sectional explanatory view of a state in which the engagement collar responds quickly to changes in the diameter of the antenna cover, and FIG. 4 is a cross-sectional explanatory view of a conventional connection mechanism. In these drawings, 1 is the core, 2 is the radiator, 2a is the flange, 3 is the insulator, 4 is the antenna cover, 5 is the engagement collar, 5a is the step, 5b is the outward extension, 5c is the hook part, 5d is the recessed part, 6 is the engagement collar, 6a is the step part, 6b is the locking step, 6c is the cylindrical interposed part, 7 is a sealing material such as an O-ring, Reference numeral 8 indicates a cut, and reference numeral 9 indicates a protrusion.

Claims (1)

[Scope of utility model registration request] When inserting the core 1 formed coaxially with the core wire 1a connected to the power supply line in the center and the insulator 1b and interposing the insulator 3 between the radiators 2, 2, the radiator 2, A flange 2a is formed at the joining end of the flange 2, respectively, and engaging collars 5 and 6 each having a stepped part 5a and 6a that are joined to the flange 2a via a sealing material 7 are disposed oppositely, and the collars 5 and 6 are engaged with each other. color 5,6
On one side 6 are the respective flanges 2a and the insulator 3 described above.
A cylindrical interposed part 6c is formed extending and positioned between the other engaging collar 5, and a locking step 6b is engaged with and disengaged from the hook part 5c formed on the other engaging collar 5. A multi-stage sleeve antenna characterized by the following: