JP3032445B2 - Grounding terminal for coaxial cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable grounding terminal provided for grounding a coaxial cable.

[0002]

2. Description of the Related Art In a communication device, a ground terminal is attached to a coaxial cable serving as an antenna feed line in order to protect the device body from lightning surge or the like. FIG. 2 shows a conventional example thereof.

[0003] As shown in FIG. 2, a ground terminal 40 has a contact band 41 that contacts the outer conductor 32 of the coaxial cable 30,
And a clamp member 42 for tightening the contact band 41. The contact band 41 is made of a conductor such as a plain woven copper wire, to which a ground wire 54 is connected via connection fittings such as crimp terminals 51 and 52, bolts 53 and nuts. The contact strip 41 is wound around the exposed outer conductor 32 after stripping a part of the jacket 31 of the coaxial cable 30 over the entire circumference. The clamp member 42 clamps the contact band 41 to the outer conductor 32 by tightening the contact band 41 onto the outer conductor 32 from above, whereby the outer conductor 32 of the coaxial cable 30 is connected to the ground terminal 40 and the ground wire 54. To be grounded.

By simply connecting the ground terminal 40 to the coaxial cable 30 as described above, a metal portion such as the outer conductor 32 is exposed to the outside.
It is necessary to further provide a waterproof structure at the connection portion of the coaxial cable 30 of No. 0.

Therefore, in the conventional example, the entire connection portion of the ground terminal 40 is surrounded by a mold cover 58 made of a molding resin.
By filling the gap between the mold resin 59 and the mold resin 59, the connection portion of the ground terminal 40 is waterproof-protected. In this case, the waterproofing cannot be said to be complete only by filling the mold resin 59, so that the waterproofing compound 60 for preventing the infiltration of moisture is attached to the contact band 41 and the clamp member 42, or the coaxial cable 30 Jacket 3
First, in order to improve the familiarity with the mold resin 59, C
The cement 61 is applied.

In FIG. 2, reference numeral 62 denotes a funnel used when filling the mold resin 59 into the mold cover 58, and 63 denotes an insulating tape for covering a gap between the mold cover 58 and the jacket 31.

[0007]

The grounding terminal 40 for a coaxial cable as described above is generally called a mold type and has excellent waterproofness, and is therefore used outdoors. Mold cover 58 and mold resin 5
9, it is necessary to prepare a funnel 62 for filling, which not only increases the cost but also fills the mold resin 59,
The work is troublesome due to the application of the cement 61 and the like, and there is a problem in workability.

The ground terminal 40 is connected to the ground terminal 40.
There is also a problem that the mounting portion of the device becomes large and bulky, and accordingly, the stripping width of the outer cover 31 must be increased.

As described above, the conventional coaxial cable grounding terminal has problems in that the cost of parts is increased, the work is troublesome, and miniaturization is difficult in order to ensure waterproofness. .

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce costs, improve workability, and reduce the size.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a contact band connected to a ground wire and attached to an outer conductor exposed portion of a coaxial cable. in a coaxial cable grounding terminal and a clamp member tightening the top of the cable, at least the
The exposed outer conductor of the coaxial cable, the contact band and the
A waterproofing compound comprising amorphous polyalphaolefin as a main component ,
Made of stainless steel or carbon steel band
I was like that.

[0012]

According to the ground terminal for a coaxial cable having the above structure,
Since the waterproofing compound is mainly made of amorphous polyalphaolefin used for sealing materials and adhesives, its properties ensure that the connection part of the ground terminal is waterproof and protected , and Obi is a clamp
Securely fixed to coaxial cable with band as member
Will be done.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to an embodiment shown in FIG. FIG. 1 is a sectional view of a ground terminal for a coaxial cable according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a coaxial cable, 2
Is an outer conductor, and 3 is a jacket. 4 is a ground terminal, 5 is a contact band constituting the ground terminal 4, 6
Is a clamp member for tightening the contact band 5.

The ground terminal 4 of this embodiment has the same basic structure as the conventional ground terminal 40 shown in FIG.
Therefore, the contact band 5 and the clamp member 6 are provided, and the contact band 5 is made of a conductor such as a plain woven copper wire, and is connected to the crimp terminals 7 and 8, bolts 9, nuts 10, and other connection fittings. The ground wire 11 is connected and is wound around the exposed portion of the outer conductor 2 of the coaxial cable 1. Also, the clamp member 6 is wound on the contact band 5, whereby
The contact band 5 is crimped to the outer conductor 3.

In the coaxial cable 1, an exposed portion of the outer conductor 3 is formed by stripping a part of the jacket 2 over the entire circumference. The width may be narrow enough to accommodate the contact band 5 and the clamp member 6. In this embodiment, the clamp member 6 is used.
A stainless steel or carbon steel band is used.

As described above, the ground terminal 4 is connected to the coaxial cable 1
Since the metal part such as the external conductor 3 is exposed to the outside just by connecting to this, it is necessary to waterproof this part. This embodiment is characterized by its waterproof structure.

That is, the entire outer periphery of the grounding terminal 4 and the connecting portion thereof is covered with a waterproof compound 12 mainly composed of amorphous polyalphaolefin, and a butyl rubber tape 13 and an adhesive The tape 14 is sequentially wound so that the entire waterproof compound 12 is at least double-coated.

The amorphous polyalphaolefin which is a main material of the waterproofing compound 12 is, for example, a product name “UBETA”.
CAPAO "(manufactured by Ube Lexen Co., Ltd.), propylene alone or propylene and ethylene or butene-
Is an amorphous olefin-based polymer having a relatively low molecular weight, produced by copolymerizing 1 with, and having a property of low viscosity, soft, and easy to dissolve. It is used for hot melt adhesives, sealing materials, coating materials, etc. The waterproof compound 12 has good adhesiveness to the jacket 2 made of polycarbonate or the like corresponding to the properties of the main material, and has low viscosity and softness, and is filled in small gaps.

Next, a procedure for mounting the ground terminal 4 in the above configuration will be described. First, a part of the jacket 2 is stripped over the entire circumference at a place where the coaxial cable 1 is to be grounded, so that a part of the outer conductor 3 is exposed. Then, a contact band 5 is wound around the exposed portion of the outer conductor 3, and a stainless steel band serving as a clamp member 6 is further wound on the contact band 5, and the contact band 5 is tightened with the band so that the contact band 5 becomes an outer conductor. 3 is connected by crimping.

Next, the crimp terminal 7 attached to the contact band 5 and the crimp terminal 8 on the side of the ground wire 11
The contact band 5 is connected to the ground wire 11 by a connection fitting such as a nut 11. Thus, the contact band 5 is connected to the ground wire 11.
Through the ground.

Thereafter, the ground wire 11 and the crimp terminals 7, 8
These are fixed to the coaxial cable 1 with an adhesive tape so that they do not move, and a waterproof compound 12 is attached so as to be wound around the ground terminal 4, the crimp terminals 7, 8, the ground wire 11, the jacket 2, and the like. 12 wraps the entire connection portion of the ground terminal 4. Then, a butyl rubber tape 13 is first wound around the waterproof compound 12, and then an adhesive tape 14 is wound thereon, and the waterproof compound 12 is covered with the tapes 13 and 14.

Since the waterproof compound 12 has a low viscosity and is soft, it enters into a small portion, and the tapes 13 and 14 are used.
Will be filled without gaps inside the
Since it adheres well to the jacket 2 of the coaxial cable 1 and the jacket of the ground wire 11, it prevents water and moisture from entering without using C cement or the like, and reliably protects the connection portion of the ground terminal 4 with waterproofing. I do.

[0024]

As described above, according to the present invention, the connection portion of the ground terminal is reliably waterproofed and protected by the waterproofing compound containing amorphous polyalphaolefin as a main component. There is no need to provide a mold gobber or a funnel, and the number of parts is reduced and the cost can be reduced.

Further, the waterproof compound penetrates into small gaps depending on the properties of the amorphous polyalphaolefin as its main material, and is well adapted to the jacket of the coaxial cable. It can be installed simply by covering and winding it. Therefore, there is no need for complicated work such as pouring mold resin with a funnel after covering the grounding area with mold gaher, and there is no need for work such as applying C cement to a coaxial cable. I can do it.

Further, since the mold cover is not used, the connecting portion of the ground terminal is not bulky and can be miniaturized.

If an inexpensive stainless steel or carbon steel band is used as the clamp member, the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a ground terminal for a coaxial cable according to an embodiment of the present invention.

FIG. 2 is a sectional view of a ground terminal for a coaxial cable according to a conventional example.

[Explanation of symbols]

1 coaxial cable, 2 jacket, 3
Outer conductor, 4 ground terminal, 5 contact zone,
6 clamp member, 11 ground wire,
12 waterproof compound, 13 butyl rubber tape, 14 adhesive tape

Continuation of front page (56) References JP-A-6-231813 (JP, A) JP-A-4-149292 (JP, A) JP-A-6-136207 (JP, A) JP-A-59-25108 (JP) JP-A-59-120834 (JP, A) JP-A-6-136245 (JP, A) JP-A-58-112203 (JP, A) JP-A-5-194751 (JP, A) JP-A-51-143051 (JP, A) JP-A-49-11942 (JP, A) JP-A-7-282866 (JP, A) JP-A-5-80125 (JP, U) (58) Fields investigated (Int. Cl. ^7, DB name) H01R 17 / 04,4 / 64 H02G 15/00

Claims (1)

(57) [Claims] 1. A coaxial cable ground terminal comprising: a contact band connected to a ground wire and attached to an exposed outer conductor of a coaxial cable; and a clamp member for clamping the contact band from above the coaxial cable. Wherein at least the outer conductor exposed portion of the coaxial cable,
Covering the touch band and the clamping member is provided with a waterproof compound of the amorphous polyalphaolefin composed primarily, or
The clamping member is made of stainless steel or carbon steel.
A grounding terminal for a coaxial cable, which is constituted by a band .