JPS6330124Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connector attached to the end of a coaxial cable, particularly a trunk coaxial cable (LCX).

The connector fixed to the end of the LCX is constructed by inserting the center contact 2 from the end of the aluminum center conductor 1 and pushing the center contact 2 apart in the radial direction, as shown in Figure 1. It is fixed to the inner surface of the conductor 1.

That is, a tapered hole 3 is provided from the rear end to the tip in the axial direction of the center conductor 1, a slide piece 4 is housed in this hole 3, and a hexagon socket head bolt 5 is screwed into this piece 4. By inserting a torque wrench into the bolt 5 through the opening 6 at one end and rotating the bolt 5, the slide piece 4 is inserted into the hole 3 of the center contact 2.
It advances inwardly along the taper of the center contact 2 and expands the center contact 2 outward.

The center contact 2 is provided with slots dividing the center contact into a plurality of equal parts in the circumferential direction, and a thread groove is carved on the outer circumferential surface of the center contact 2.

However, as shown in FIG. 2, the torque wrench 7
By rotating the hexagon socket head bolt 5 and setting the tightening torque to the set value, the slide piece 4
is moved to a predetermined position, the blades 8 are pushed apart, and the threads carved on the outer periphery of the blades 8 are inserted into the inner surface of the center conductor 1, and both are fixed.

However, the conventional connector with the above configuration has the following drawbacks.

That is, if the hexagon socket head bolt 5 in the center contact 2 is tightened with excessive torque, the blades 8 will expand too much, causing the edge portion 4a of the slide piece 4 to become wedged into the inner surface of the hole 3 in the center contact 2, causing the radial direction of the blade 8 to This weakens the pressing force and makes firm pressure contact with the inner surface of the center conductor 1 impossible.

The present invention was developed based on the above-mentioned circumstances, and consists of making the taper angle of the hole of the center contact different from that of the slide piece inserted into this hole, and also making the taper angle of the hole of the center contact different from the taper angle of the slide piece inserted into this hole. It is an object of the present invention to provide a coaxial cable connector that can firmly fix a center conductor and a center contact by changing the shape.

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

FIG. 3 is a sectional view of the coaxial cable connector according to the present invention.

The connector 10 includes a center contact 11, a slide piece 13 housed in a tapered hole 12 of the center contact 11, and a hexagonal piece screwed onto the slide piece 13 and slid in the tapered hole 12 of the center contact 11. It consists of a bolt with a hole 14.

On the outer periphery of the tip of the center contact 11, a serrated thread 15 is formed over a certain length in place of a conventional metric thread.

Further, this tip portion is divided into a plurality of blades 17 by providing slots 16 at equal intervals in the circumferential direction.

Inside the tapered hole 12 of the center contact 11,
The slide piece 13 is inserted, but the taper angle θ ₁ of the tapered hole 12 and the taper angle θ ₂ formed on the outer periphery of the slide piece 13 are made different.

That is, the taper angle θ ₂ of the slide piece 13 is determined by the following equation.

θ ₂ = θ ₁ + △θ ₁ …(1) Here, d...outer diameter of the center contact, △d...center contact (blade) due to movement of the slide piece
Assuming that the increasing outer diameter of , l... is the length of the tapered hole, θ ₁
= tan ^-1 d/2/l, △θ ₁ = tan ^-1 △d/2/l, so the above equation (1) becomes as follows.

θ ₂ =tan ⁻¹ (d/2+△d/2)/l …(2) As is clear from equations (1) and (2) above, θ ₂ >θ ₁ , and in the embodiment of the present invention, θ ₁ = 6° and θ ₂ = 7°.

Furthermore, the end surface of the slide piece 13 is provided with an appropriate radius.
This prevents damage to the inner wall of the tapered hole 12 during sliding.

A projection 18 projecting outward in the radial direction is provided at the reduced diameter end of the slide piece 13.
8 is configured to slide in the axial direction within the slot 16 of the center contact 11.

Further, a screw hole 19 is provided in the center of the slide piece 13, and a threaded portion 20 of a hexagon socket head bolt 14 is screwed into this screw hole 19.

Therefore, when the hexagon socket head bolt 14 is turned using a torque wrench (not shown), this bolt 1
A slide piece 13 screwed onto the tip of the center contact 11 moves within the tapered hole 12 of the center contact 11. With this movement, the enlarged diameter end of the slide piece 13 pushes the blades 17 outward and brings them into pressure contact with the inner surface of a central conductor (not shown). In this case, the blade 17
Since a serrated screw 15 is formed on the outer peripheral surface of the contact 10, the entire contact 10 is effectively prevented from coming off from the center conductor.

Furthermore, since the taper angle θ ₁ of the tapered hole 12 of the center contact 11 is different from the taper angle θ ₂ of the slide piece 13, the contact point between the inner wall of the tapered hole 12 and the outer periphery of the slide piece 13 is Only the enlarged diameter part is used, which makes it easier to move inside the tapered hole 12, and prevents the slide piece 13 from digging into the inner wall of the tapered hole 12 due to excessive torque tightening of the hexagon socket head bolt 14 as in the conventional case. Prevented.

FIG. 5 shows another embodiment of the present invention,
A groove 21 is provided at the reduced diameter end of the slide piece 13, and a coil spring 22 is disposed within the groove 21.
Furthermore, a steel ball 2 is attached to the tip of this coil spring 22.
3 are provided, and these steel balls 23 and coil springs 2
The threaded portion of a hexagon socket head bolt 14 is screwed into the center of the slide piece 2 and the slide piece 13.

In the above configuration, by rotating the hexagon socket head bolt 14 with a torque wrench, the slide piece 13 slides and the coil spring 2
2, the steel ball 23 moves in the direction of the arrow, pushing the blades 17 outward, and the serrated screws 15 carved on the outer periphery of the blades 17 sink into the inner surface of the center conductor 24, so that both Pressed. However, due to the biting into the center conductor 24, stress relaxation occurs even when the hexagon socket head bolt 14 is tightened with a predetermined tightening torque, and the pressure contact force generally decreases due to the influence of this stress relaxation.

In this embodiment, since the steel ball 23 is constantly pressed in the direction of the arrow by the coil spring 22, it is possible to avoid the influence of stress relaxation described above.

Note that also in the above embodiment, the tapered hole 12
There is a difference between the taper angle of the slide piece 13 and the taper angle of the slide piece 13, and the latter is made larger than the former by a very small angle.

As is clear from the above description, according to the present invention, a slight angle difference is provided between the taper angle of the tapered hole of the center contact and the taper angle of the slide piece that slides through this tapered hole, and the taper A gap is provided between the inner surface of the hole and the outer surface of the slide piece that increases toward the diameter-reduced end of the slide piece, and a serrated thread is carved on the outer periphery of the blade, so that it can be pressed against the center conductor. The force becomes strong and the entire connector is effectively prevented from coming off from the center conductor.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal sectional views showing the process of attaching a conventional coaxial cable connector to the center conductor;
FIG. 3 is a longitudinal cross-sectional view of the connector of the present invention, FIG. 4 is a side view thereof, and FIG. 5 is a longitudinal cross-sectional view showing another embodiment of the present invention. 10... Connector, 11... Center contact,
12...Tapered hole, 13...Slide piece, 1
4...Hexagon socket head bolt, 15...Serrated screw,
17...Blade, θ ₁ ...Taper angle of tapered hole, θ ₂
...The taper angle of the slide frame.

Claims (1)

[Scope of utility model registration request] A center contact is provided with a plurality of blades formed by carving sawtooth threads on the outer circumferential surface and equally dividing a cylinder in the circumferential direction, and has a tapered hole with a taper angle of θ ₁ in the axial direction at the center; A coaxial coaxial device comprising: a slide piece inserted into the tapered hole of the center contact and having a taper angle θ ₂ larger than the taper angle θ ₁ ; and a screw screwed into the slide piece to move the slide piece. Cable connector.