JPS6022766Y2 - Watertight continuity test terminal - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a watertight continuity test terminal used for coaxial cables, particularly leaky coaxial cables.

Usually, when a coaxial cable is shipped, a watertight connector is provided at the end of the cable, and the cable is filled with gas before being shipped.

For this reason, there is a risk of accidents caused by vibration loading and unloading during transport, such as bending of cables, loosening of connector attachment parts, and damage, so in order to confirm whether accidents have occurred, it is necessary to check the pressure of the filled gas. A continuity check is performed.

Conventionally, for this continuity check, for example, as shown in FIG. It is conceivable to use a terminal for continuity testing, which is formed by providing a metal layer 4 and a polyethylene layer 5 having a length of approximately half the length of the metal layer 4 on the outer periphery thereof.

The terminal is constructed and shipped in such a way that a continuity test can be performed by installing the terminal into a connector cap nut provided on the cable terminal.

However, such cables are often left in places where water ice or moisture easily enters, such as outdoors, in tunnels, or in caves, for a long period of time until they are installed after being shipped.

For this reason, the terminal for continuity testing as shown in FIG. 1 is not preferable because water or moisture infiltrates between the inner conductor 1 and the foam layer 3 and from the foam layer 3.

Therefore, as a measure to prevent accidents caused by infiltration, a moisture-proof treatment section 6 is provided, which is wrapped with butyl rubber tape and vinyl tape, for example.

However, even if the moisture-proof treatment section 6 is formed using rubber tape or vinyl tape, the rubber tape or vinyl tape may deteriorate or
Furthermore, the taping process, for example, requires time and effort in the winding process.

There is a need for a watertight continuity test terminal that can overcome these difficulties.

In view of the above-mentioned difficulties, the present invention has been developed to provide a watertight conductive terminal that can prevent water from entering even if it is left outdoors, in tunnels, or even in caves for long periods of time, and that can also function as a conductive terminal. We propose a test terminal, and its gist is that it is a continuity test terminal that can be installed inside the cap nut of a connector that is attached to the end of a coaxial cable.
an insulator having a center conductor, a small diameter section mounted on the center conductor, a large diameter section divided on a plane perpendicular to the axis, and a large diameter section for integrally joining the divided large diameter sections. A metal sleeve is fitted around the outer circumference of the large diameter section, and a packing is attached near the center conductor contact side of the divided surface of the large diameter section, and a packing is attached between the metal sleeve and the large diameter section above the waist. The center conductor is inserted into a socket connected to the center conductor connecting member of the connector, and the metal sleeve is configured to be housed in a cap nut connected to the outer conductor connecting member of the connector. Terminal for continuity test.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in the drawings.

Fig. 2 is a vertical cross-sectional view of the watertight continuity test terminal A of the present invention, and Fig. 3 shows the watertight insulation test terminal A of the present invention attached to the cap nut pot of the connector provided on the cable. FIG.

FIG. 4 is an explanatory diagram when conducting a continuity test using the watertight continuity test terminal A of the present invention.

Note that common symbols in each figure indicate common parts.

In FIG. 2, 11 is the center conductor of the watertight continuity test terminal A of the present invention.

The conductor 11 is in the form of a pin formed by molding a metal such as copper or a copper alloy, and is preferably used with a plating layer of gold, nickel, etc. applied to the outer periphery.

Further, a threaded portion 11a is provided at the other end of the conductor 11, and the lead wire 8 is attached by sandwiching the terminal 8a with two nuts llb.

22 is an insulator provided on the outer periphery of the center conductor 11, which has a large diameter part and a small diameter part, and is cut at the large diameter part in a plane perpendicular to the axial direction and divided into pieces 22 a and 22 b. In the piece 22a, the shoulder surface 221 of the cap nut part of the connector, which will be in contact with the spacer 143 (described later), has the above-mentioned large diameter part,
It is formed by a stepped part of the small diameter part.

The insulator 22 is appropriately selected from, for example, fluororesin or other plastic resins.

Reference numeral 33 denotes a metal sleeve provided on the outer periphery of the large diameter portion of the insulator 22, which is divided as described above.
Both ends of the insulator 22 are connected to a part of the shoulder surface 221 of the part 22a and a part of the side end face 222 of the part 22b, respectively, in order to couple and fix the divided part 22a and the part 22b of the insulator 22. It is caulked.

The metal sleeve 33 is made of, for example, a copper alloy or other alloy, and its inner and outer surfaces are smoothed, and may be coated with a nickel plating layer, for example.

Reference numeral 9 denotes a gasket such as an O-ring provided between the center conductor 11 and the insulator 22, and is installed in a groove formed on the side of the piece 22b that faces the piece 22a.

Further, reference numeral 10 indicates an O
It is a package such as a ring.

The gaskets 9 and 10 are provided to block water from entering between the layers from the outside.

Insulating cylinder packing 9.10. For example, ordinary paran made of natural rubber, neoprene rubber, nitrile rubber, fluororubber or silicone rubber is appropriately selected and used.

The watertight continuity test terminal A constructed as described above is used by being installed in a connector C as shown in FIG.

In Figure 3, connector C provided on the coaxial cable
The bag nut part will be explained.

The threaded portion 114 a is screwed into the inner conductor connecting member 111 of the connector C, the outer conductor connecting member 140 of the socket portion 112 connected thereto, and the flange portion 113 connected thereto.

Tighten with a cap nut 114, and attach the threaded part 11 to the nut 114.
They are screwed together at 5a.

When tightening, the nut 115 holds the inner conductor connecting member 111 and the outer conductor connecting member 140 at a distance.

Insulator 116 for preventing color continuation, flange 113, and socket 1
12 are held at intervals.

A contact prevention insulator 117, a bag nut 114, and a gasket 18, which maintains watertightness between the flange portion 113, and a bag nut 114.
A packing 119 that maintains watertightness between the flange portion 113 and a packing 141 that maintains watertightness between the flange portion 113 and the outer conductor connecting member 140 has an outer circumferential surface that engages with a tapered inner circumferential surface of the end of the flange portion 113. , a tightening clamp 142 provided with a groove, a spacer 143, a gas filling plug 144, and the like.

The watertight continuity test terminal A is then attached so that the center conductor 11 is inserted into the socket portion 112 on the connector side.

Thereafter, by tightening and screwing the tightening nut 114 onto the flange portion 113, the outer periphery of the small diameter portion of the piece 22a of the insulator 22 of the watertight continuity test terminal A is tightened with the tightening clamp 142 via the spacer 143. Tighten the surface.

Furthermore, the assembly is completed by tightening the nut 115 onto the tightening nut 114.

Therefore, the gasket 119 is pressed against the surface of the metal sleeve 33 of the watertight continuity test terminal A by the repulsive force caused by the compression.

These completely block water from entering from the outside at the contact surface between the cap nut portion of the connector C and the watertight continuity test terminal A.

Furthermore, the continuity test terminal A itself is also watertight as explained above.

The outline of a cable continuity test using the watertight continuity test terminal A of the present invention will be explained below with reference to FIG.

In FIG. 4, first, the inner conductor connecting member and the outer conductor connecting member of the connector C' provided at one end of the coaxial cable B are short-circuited by a shorting plate 130.

It should be noted that the connector C' can be, for example, the same as the connector C shown in FIG. different.

Then, a DC voltage was applied via the lead wire 8 to the center conductor 11 of the watertight continuity test terminal A, which was installed as described above in the cap nut part of the connector C shown in FIG. Power up.

Therefore, the DC voltage is sequentially applied to the center conductor 11 of the watertight continuity test terminal A. Connector internal conductor connecting member 111, said member 11
Inner conductor 11a of coaxial cable B electrically connected to
1, the short-circuited connector C' at the other end is supplied to the tester 120 through the outer conductor 14a of the coaxial cable B, the flange portion 113, etc. which conducts with the outer conductor connecting member of the connector C to which the conductor 14a is electrically connected.

By applying a DC voltage in this manner and confirming that current has flowed, it can be determined that the cable and connector are normal.

As mentioned above, the watertight continuity test terminal A of the present invention has the following characteristics:
It completely blocks out water and moisture from entering from outside, and continuity tests can be easily performed on-site.

Furthermore, the wrapping of conventional rubber tape, vinyl tape, etc. (as shown in FIG. 1) is no longer necessary, and is highly effective in practice.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a terminal for continuity testing, and FIG. 2 is a longitudinal sectional view of terminal A for watertight continuity testing of the present invention. FIG. 3 is a partially cutaway longitudinal cross-sectional view of the watertight continuity test terminal A of the present invention installed in the cap nut of a connector provided on a coaxial cable. FIG. 4 is a schematic explanatory diagram for explaining a method of conducting a continuity test using the watertight continuity test terminal A of the present invention. In the figure, A is the watertight continuity test terminal of the present invention, B is the coaxial cable, C is the connector, 11 is the center conductor, 22
is an insulator, and 22a and 22b are members 33 constituting the insulator.
1 is a metal sleeve, 9 is a gasket attached to the groove 222 of the member 22b, 10 is a gasket attached to the groove 223 of the member 22b, 111 is a center conductor connecting member of the connector C, 1
12 is a socket, 140 is an external conductor connecting member, 113 is a flange portion, and 114 and 115 are tightening nuts, respectively.

Claims (1)

[Scope of utility model registration request] A continuity test terminal that can be installed inside the cap nut of a connector that is attached to the end of a coaxial cable, and is divided by a central conductor, a small diameter part installed on the central conductor, and a plane perpendicular to the axis. It consists of an insulator having a large diameter part and a metal sleeve fitted around the outer periphery of the large diameter part to unite the divided large diameter part, and the center of the dividing surface of the divided large diameter part. A packing is installed near the conductor contact side and a packing is installed between the metal sleeve and the large diameter portion, and the center conductor is inserted into a socket connected to the center conductor connecting member of the connector, and the metal sleeve is inserted into the socket connected to the center conductor connecting member of the connector. teeth,
A watertight continuity test terminal configured to be housed in a cap nut connected to an external conductor connecting member of a connector.