JPH0441581Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a waterproof coaxial connector provided outside a casing that accommodates a common listening circuit such as a branching or distribution circuit.

[Technical background of the invention and its problems]

The connection between a coaxial cable and public listening equipment is generally made between a plug on the coaxial cable side and a coaxial connector on the communal listening equipment side, and the coaxial connector is installed in advance on the outside of the casing that houses the communal listening circuit. There is. Conventionally, public listening equipment used outdoors has been provided with a waterproof coaxial connector as shown in FIG. In FIG. 3, reference numeral 22 denotes a casing of the public listening device, and a coaxial connector 20 is provided on the outside of the casing 22. The coaxial connector 20 includes a hollow cylindrical outer conductor 21 for connecting a coaxial cable, a substantially hollow cylindrical elastic member (for example, synthetic rubber) 23 inserted into the inner tip side of the outer conductor 21, and an outer conductor 21. an approximately central cylindrical insulator 25 inserted into the rear end side of the interior of the insulator 25;
The contact pin 27 is inserted and held in the coaxial cable and connected to the center conductor of the coaxial cable.
Furthermore, a substantially conical guide recess 23a is formed on the front end surface of the elastic member 23.

When a coaxial cable side plug (not shown) is attached to this conventional waterproof coaxial connector 20, the center conductor of the coaxial cable enters the guide recess 23a, passes through the elastic member 23, and reaches the contact pin 27. connected to. In this case, since the center conductor of the coaxial cable is closely surrounded by the elastic member 23, water can be prevented from entering the coaxial connector 20 even when the communal listening device is used outdoors.

However, the conventional waterproof coaxial connector 20
When attaching a plug to the coaxial cable side, for example, if the tip of the center conductor of the coaxial cable is bent, the center conductor 28 of the coaxial cable will stick into the guide recess 23a off-center, as shown in FIG. . Then the center conductor 28 of the coaxial cable
reaches contact pin 27 and contact pin 2
7 and pushed in the direction of the central axis. When the center conductor 28 of the coaxial cable is pushed in the direction of the center axis, the elastic member 23
8 applies force and deforms it. Elastic member 23
Of these, the left side portion 2 of the center conductor 28 of the coaxial cable
3b is compressed, while the right side portion 23c is in tension. Therefore, a gap is created between the right side portion 23c of the elastic member and the center conductor 28 of the coaxial cable, and water may leak into the coaxial connector 20 from this gap. In addition to this phenomenon, a gap occurs between the elastic member 23 and the center conductor 28 of the coaxial cable, as shown in FIG. deviates from the axis of the coaxial connector 20, or as shown in FIG. This may occur if the center conductor is misaligned or if the center conductor is bent as shown in FIG. Reference numeral 3 in Figures 5, 6 and 7.
0 is the plug on the coaxial cable side.

[Purpose of invention]

The present invention was developed with these points in mind, and when attaching a plug on the coaxial cable side to a coaxial connector, the tip of the center conductor of the coaxial cable may become bent and the center conductor of the coaxial cable may become distorted. It is an object of the present invention to provide a waterproof coaxial connector that can prevent water from leaking into the coaxial connector even if a gap occurs between the coaxial connector and the elastic member.

[Summary of the idea]

The present invention consists of a hollow cylindrical outer conductor for coaxial cable connection that is fixedly installed outside a casing that houses a communal listening circuit, and a substantially hollow cylindrical elastic conductor that is inserted into the distal end side of the outer conductor. a substantially hollow cylindrical insulator inserted into the rear end side of the outer conductor;
A waterproof coaxial connector comprising a contact pin inserted and held in the insulator and connected to the center conductor of the coaxial cable, the elastic member comprising:
A substantially conical guide recess is formed on the tip surface,
It is characterized in that a cylindrical portion having an axis substantially the same as the axis of the guide recess is formed on the back surface of the tip end thereof.

According to the present invention, when attaching a plug on the coaxial cable side to a coaxial connector, even if the tip of the center conductor of the coaxial cable bends and a gap is created between the center conductor of the coaxial cable and the elastic member. Since a cylindrical part having an axis substantially the same as the axis of the guide recess is formed on the back surface of the tip of the elastic member, the center conductor of the coaxial cable is closely surrounded by this cylindrical part, preventing water leakage to the coaxial connector. can be prevented.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are diagrams showing an embodiment of a waterproof coaxial connector according to the present invention. In the figure, reference numeral 12 is a casing that houses a public listening circuit therein, and a hollow cylindrical outer conductor 11 for connecting a coaxial cable is fixedly provided on the outside of the casing 12. A male thread 11a is formed on the outer periphery of the outer conductor 11, so that the outer conductor 11 can be screwed into a coaxial cable side plug (not shown). A substantially hollow cylindrical elastic member (for example, synthetic rubber) 13 is inserted into the front end of the outer conductor 11, and a substantially hollow cylindrical insulator 15 is inserted into the rear end of the outer conductor 11. has been done. A contact pin 17 to which a center conductor (not shown) of a coaxial cable is connected is inserted and held inside the insulator 15 . The elastic member 13 will be explained in more detail with reference to FIG. Elastic member 1
A substantially conical guide recess 13 is provided on the tip surface 13a of 3.
b is formed. This guide recess 13b serves to guide the center conductor of the coaxial cable to the center of the elastic member 13. A cylindrical portion 13d having the same axis as the axis of the guide recess 13b is formed on the rear end surface 13c of the elastic member 13. This cylindrical portion 13d is designed to tightly surround the center conductor of the coaxial cable below the elastic member 13 even if the center conductor of the coaxial cable sticks into the guide recess 13b off-center. It has sufficient elasticity. Furthermore, the inner diameter D of the cylindrical portion 13d is slightly smaller than the outer diameter of the center conductor of the coaxial cable.

Further, an annular groove 13 is provided on the outer periphery of the cylindrical portion 13d.
The annular groove 13e allows the cylindrical portion 13d to swing freely. Coaxial connector 10 is formed by these outer conductor 11, elastic member 13, insulator 15, and contact pin 17.
It consists of

Next, the operation of this embodiment having such a configuration will be explained.

When a coaxial cable side plug (not shown) is attached to the coaxial connector 10, the center conductor of the coaxial cable enters the guide recess 13b, is guided to the center of the elastic member 13 by the guide recess 13b, and is guided to the center of the elastic member 13. 13 and reaches the contact pin 17 and is connected to the contact pin 17.

If the tip of the center conductor of the coaxial cable is offset from the center, it is guided to the center by the inclined part of the guide recess 13b, passes through the elastic member 13f as the plug is tightened, reaches the contact pin 17, and is connected to the contact pin 17. However, when the plug is tightened by the force that causes the tip of the center conductor to bend, the contact pin 17 is pushed laterally and the elastic member 13 is deformed under pressure.

In addition, if the contact pin 27 is offset from the axis, if the rear end of the center conductor is offset from the center of the coaxial connector 20, or if the center conductor is bent in a dogleg shape, in such cases Since the cylindrical portion 13d is formed on the back surface 13c of the tip of the elastic member 13, even if the elastic member 13 is deformed under pressure and a gap is created between the center conductor of the coaxial cable and the elastic member 13, the cylindrical portion 13d closely surrounds the center conductor of the coaxial cable, so the elastic member 1
Water does not leak into the coaxial connector 10 through the connector 3. Furthermore, since the inner diameter of the cylindrical portion 13d is slightly smaller than the outer diameter of the center conductor of the coaxial cable, the center conductor of the coaxial cable can be strongly tightened by the cylindrical portion 13b to further prevent water leakage. Furthermore, an annular groove 1 is formed on the outer periphery of the cylindrical portion 13d.
3e is formed, the cylindrical portion 13d is
It is swingable so as to surround the center conductor of the coaxial cable, depending on the position of the center conductor of the coaxial cable. In addition, the center portion 13f of the elastic member 13
A hole is made with a needle in the center conductor of the coaxial cable, and the outer diameter of the tip surface 13a of the elastic member is slightly smaller than the inner diameter of the outer conductor 11 so that the waterproof effect can be maintained even if the center conductor of the coaxial cable is not penetrated. I try to make it larger and apply pressure towards the center. In addition, when molding the elastic member 13 from synthetic rubber, it is necessary to apply a force of several 100 kg/cm ² , but it is necessary to
The tips of the molds that form the inner diameter D portion of the molds are prevented from directly colliding with each other to prevent deformation of the molds.

[Effect of idea]

As explained above, according to the present invention, when attaching a plug on the coaxial cable side to a coaxial connector, the tip of the center conductor of the coaxial cable may bend and become loose, causing a gap between the center conductor of the coaxial cable and the elastic member. Even if a gap occurs, the center conductor of the coaxial cable is tightly surrounded by the cylindrical portion formed on the back surface of the tip of the elastic member, so water leakage to the coaxial connector can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a water-discharging coaxial connector according to the present invention, FIG. 2 is an enlarged sectional view of the elastic member shown in FIG. 1, and FIG. 3 is a sectional view showing a conventional waterproof coaxial connector. Figure 4 is a cross-sectional view showing the case where the center conductor of a coaxial cable with a bent tip enters a conventional prevention type coaxial connector, and Figure 5 shows the contact pin of a conventional waterproof coaxial connector being deviated from the center. A cross-sectional view showing the case where the center conductor of a coaxial cable has entered the connector. Figure 6 is a cross-sectional view showing the case where the rear end of the center conductor of the coaxial cable has entered a conventional waterproof coaxial connector. FIG. 3 is a cross-sectional view showing a case where the center conductor of a coaxial cable is bent and enters a waterproof coaxial connector. 10...Coaxial connector, 11...Outer conductor, 1
2...Casing, 13...Elastic member, 13a...
...Tip surface, 13b...Guiding recess, 13c...Tip back surface, 13d...Cylindrical portion, 13e...Annular groove, 15...Insulator, 17...Contact pin.

Claims (1)

[Scope of utility model registration request] a hollow cylindrical outer conductor for connecting a coaxial cable fixed to the outside of a casing housing a public listening circuit; a substantially hollow cylindrical elastic member inserted into the distal end side of the outer conductor; In the waterproof coaxial connector, the waterproof coaxial connector includes a substantially hollow cylindrical insulator inserted into the rear end side of the outer conductor, and a contact pin inserted and held in the insulator to which the center conductor of the coaxial cable is connected. The member has a closed surface at its distal end, a substantially conical guide recess formed on its surface, and has an axis substantially the same as the axis of the guide recess on the back surface of its distal end, and has an outer surface of the center conductor of the coaxial cable. 1. A waterproof coaxial connector characterized in that a cylindrical portion having an inner diameter slightly smaller than the diameter of the cylindrical portion is formed in a protruding manner, and an annular groove is formed on the outer periphery of the cylindrical portion.