JPH0236722A - Connector for coaxial cable - Google Patents

Abstract

PURPOSE:To clamp a coaxial cable reliably without causing insufficient contact even under a condition associated with temperature rise by providing a tightening ring having shape-memory function. CONSTITUTION:A connector 10 for a coaxial cable 1 mainly comprises a tightening nut 20, a shell 30, a tapered clamp 40, a tightening ring 50, a reinforcing sleeve 60 and a central contact 70. The tapered clamp 40 is split longitudinally and can be shrinked when the taper face 44 is pressed. The tightening ring 50 has a closed loop structure associated with a separated section and the ring 50 is made of shape-memory material. The shape is stored under high temperature and the inner diameter of the ring to be stored is set to be slightly smaller than the inner diameter of the outer conductor 4 of the coaxial cable 1. The coaxial cable 1 and the connector 10 are mainly coupled through the tapered clamp 40 when there is no temperature rise and through the tightening ring 50 when there is temperature rise.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a coaxial cable connector that improves clamping failure caused by temperature changes.

rPrior Art 1 As is well known, when a coaxial cable, which is a type of broadband cable, is connected to telecommunications equipment, the coaxial cable is terminally processed and a predetermined connector is attached to the processed terminal.

Below is an example of terminal treatment for aluminum pipe coaxial cable.
This will be explained with reference to FIG.

The coaxial cable l shown in FIG. 4 has a center conductor 2. Internal insulation layer 3
, an outer conductor 4, and a jacket 5. When the coaxial cable 1 is terminated, a part of the end of the outer conductor 4 is cut off, and then the terminal of the inner insulating layer 3 is removed to form the center conductor. Pull out the second terminal to the outside.

A fitting connector is attached to the coaxial cable 1 which has been terminal-treated in this way, and the coaxial cable 1 is connected to a predetermined device via the fitting connector.

Such a fitting connector generally has a tightening nut connected in the axial direction, a taper clamp interposed between the internal weight of the shells, and the tip of the coaxial cable 1 is inserted into such a connector. tightening nut,
When the shells are tightened together in the axial direction, the taper clamp is radially reduced through the tightening nut, so that the jacket 5 of the coaxial cable 1 is firmly gripped.

rProblem to be solved by the invention 1 In the case of the above-mentioned fitting connector 1 There is no particular problem functionally, but under high temperature climatic conditions or other environments accompanied by temperature rise, the synthetic resin (chlorinated resin) of the coaxial cable 1 The outer sheath 5 made of (vinyl) becomes soft, and the outer conductor 4
When an unexpected external force acts on the coaxial cable l, poor contact between the coaxial cable l and the connector tends to occur.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a connector that can reliably clamp a coaxial cable without contact failure even if the outer sheath becomes soft due to a rise in temperature.

Means for Solving Problems j In order to achieve the intended purpose, the present invention includes a tightening nut connected in the axial direction, and a taper for clamping the outer periphery of the tip of the coaxial cable in the internal space between the shells. In a coaxial cable connector in which a clamp is interposed, a tightening ring having a shape memory function that memorizes the reduced diameter shape in a high temperature state is provided on the inner circumferential surface of the taper clamp and is restrained from moving in the axial direction. It is characterized by

1. In the present invention, when the tip of the coaxial cable is inserted into the connector and the tightening nut and shell are tightened together in the axial direction, the taper clamp is reduced in the radial direction via the tightening nut. The outer conductor and sheath of the cable are tightly gripped.

In such a clamped state, unless an extreme temperature rise occurs, poor contact between the coaxial cable and the connector will not occur.

In the clamped state described above, if the temperature rises to such an extent that the outer sheath of the coaxial cable becomes soft, the tightening ring, which is located on the inner peripheral surface of the taper clamp and remembers the reduced diameter shape of the high temperature state, will respond to that temperature. As it rises, it restores its shape (reduces its diameter) and strongly clamps the coaxial cable inside the connector from its outer periphery.

Moreover, since the axial movement of the tightening ring is restricted, the coaxial cable and the connector will not shift in the axial direction from each other.

There will be no contact failure between connectors.

Embodiment Embodiments of the coaxial cable connector according to the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an aluminum pipe coaxial cable (hereinafter simply referred to as a coaxial cable), and 10 is a coaxial cable connector called a fitting connector.

The coaxial cable l is as described in FIG. 4 above.

The coaxial cable 1 has a well-known structure including a center conductor 2, an inner insulating layer 3, an outer conductor 4, and a jacket 5, and the coaxial cable 1 is also terminal-treated as shown in FIG. 4.

The connector 10 has a tightening nut 20. Shell 30, taper clamp 40, tightening ring 50, reinforcing sleeve BO1 center contact 70, insulating seal ring (0 ring) 80, old, 82.83, gasket 84. It consists of a combination of insulators 85.8B, 87, etc.

The tightening nut 20 has an inner diameter that is relatively larger than the outer diameter of the coaxial cable 1.

Specifically, when the tightening nut 20 is fitted onto the outer circumference of the coaxial cable 1, the base end of a taper clamp 40, which will be described later, can be interposed between the outer circumferential surface of the coaxial cable and the inner circumferential surface of the tightening nut. , the inner diameter of the tightening nut 20 is set.

A male thread 21 and a groove 22 are formed on the outer circumferential surface of the distal end of the tightening nut 20, and a tapered inner circumferential surface 23 that expands in an inclined manner is formed on the inner circumferential surface of the distal end of the tightening nut 20. A groove 24 is formed on the inner periphery of the base end of the tightening nut 20.

A seal ring 80 is fitted into the groove 22 of the tightening nut 20, and a gasket 84 is fitted into each groove 24 of the tightening nut 20.

The shell 30 has a cylindrical structure.

In this shell 30, a cylindrical portion 32 is integrally formed on the base end side of the base body 31, a male threaded cylinder 34 is integrally formed on the distal end side of the base body 31 with a neck portion 33 interposed therebetween, and a cylindrical portion A female thread 35 that pairs with the male thread 21 of the tightening nut 20 is formed on the inner circumferential surface of the nut 32 .

A seal ring 81 is fitted into the outer periphery of the neck 33 of the shell 30, and an insulator 85 is fitted into the inner periphery of the base 31 of the shell 30.
The center contact 70 is fitted into the male threaded cylinder 34 of the shell 30 via the insulators 8B, 87 and the seal rings 82, 83, and the center contact 70 is inserted into the tip of the shell 30. It protrudes outward from the side.

As shown in FIG. 2, the taper clamp 40 has a concave groove 41.
It consists of a split cylinder with a constant inner diameter except for the groove 4.
1 is formed along the circumferential direction of the inner circumferential surface of the taper clamp 40 at the longitudinal center of the taper clamp 40 .

Furthermore, the clamp 40 has a thin-walled small-diameter cylindrical portion 42 on its proximal end side.
, each having a thick-walled, large-diameter cylindrical portion 43 on its distal end side, and these thin-walled, small-diameter cylindrical portions 42 . The outer circumferential surface extending over the thick-walled, large-diameter cylindrical portion 43 is a tapered outer circumferential surface 44 .

The inner diameter of the tapered clamp 40 is slightly larger than the outer diameter of the outer conductor 4 in the coaxial cable l, and its tapered outer circumferential surface 44 freely corresponds to the tapered inner circumferential surface 23 of the tightening nut 20. The thin-walled, small-diameter cylindrical portion 42 has a size that allows it to be inserted into the tightening nut 20, and the thick-walled, large-diameter cylindrical portion 43 has a size that fits within the cylindrical portion 32 of the shell 30.

The taper clamp 40 may have a completely divided structure (divided into two or more) vertically, a split structure that allows the diameter to be reduced freely by a single slit spanning the entire axial length, or a structure in which the diameter can be reduced freely from the end of the thin-walled, small-diameter cylindrical portion 42. A split structure or the like is adopted in which the diameter can be freely reduced by one or more slits extending up to a part of the large-diameter cylindrical portion 43.

As shown in FIG. 3, the tightening ring 50 has an open loop structure with a breakaway portion 51 and is made of a shape memory material.

As a more specific example, the tightening ring 50 is made of Nitinol (Ti-Xi gold alloy), Beta-loy (ill: u-Zn-
It is made of shape memory alloys such as AI alloy).

The tightening ring 50 is heat-treated to remember the reduced diameter shape at high temperature, so even if it deforms at room temperature,
When it reaches a predetermined temperature, it restores its memorized shape.

The width and thickness of the tightening ring 50 correspond to the width and depth of the groove 41, but the inner diameter of the ring in its memorized shape is slightly smaller than the outer diameter of the outer conductor 4 in the coaxial cable 1.

This tightening ring 50 fits into the concave groove 4 of the taper clamp 40.
It is embedded within 1.

The reinforcing sleeve 80 includes a cylindrical portion 61 and a flange 82 integrally formed at the tip of the cylindrical portion B1.

The cylindrical portion 8.1 of the reinforcing sleeve 80 has an outer diameter that can be fitted into the outer conductor 4 of the coaxial cable 1,
The outer circumferential surface of the cylindrical portion B1 can come into contact with the inner circumferential surface of the outer conductor 4.

The flange 82 of the reinforcing sleeve 80 has an outer diameter that fits within the cylindrical portion 32 of the shell 30.

A connector 10 consisting of a combination of the above-mentioned members,
When the connector 10 is attached to the coaxial cable 1 whose terminal has been treated as shown in FIG. 4 to form the connector mounting structure shown in FIG. attached to the section.

First, seal ring 80. A tightening nut 20 equipped with a gasket 84 and the like is fitted onto the outer periphery of the end portion of the coaxial cable 1.

Next, a taper clamp 4 equipped with a tightening ring on the inner peripheral surface
0 is also fitted into the outer periphery of the terminal part of the coaxial cable 1,
At this time, the thin, small-diameter cylindrical portion 42 of the taper clamp 40 is interposed between the outer circumferential surface (sheath 5) of the coaxial two-pull 1 and the inner circumferential surface of the tightening nut 20.

Thereafter, the cylindrical portion 81 of the reinforcing sleeve BO is fitted into the outer conductor 4 of the coaxial cable 1 from its tip.

Furthermore, after that, the center contact 70, the seal ring 82
．． 83, shell 30 with insulators 85.8B, 87
However, the male screw 21. It is screwed together with the tightening bolt 20 via the female thread 35.

That is, the center contact 70 is interconnected with the center conductor 2 of the coaxial cable l, the proximal end surface of the shell base portion 31 is in contact with the flange 62 of the reinforcing sleeve 80, and the flange 82 is in contact with the distal end surface of the taper clamp 40. The tightening bolt 20 and the shell 30 are tightened together so that they abut.

When the tightening nut 20 and the shell 30 are tightened in this manner, the tapered outer circumferential surface 44 of the taper clamp 40 and the tapered inner circumferential surface 23 of the tightening nut 20 come into contact with each other, and the tapered inner circumferential surface 23 and the tapered outer circumference Guided by the surface 44, the taper clamp 40 is moved in the axial direction (towards the tightening nut 20) while being reduced in the radial direction.

At this time, the contraction force in the radial direction of the taper clamp acts as a force that pressurizes the outer conductor 4 of the coaxial cable 1, so the outer conductor 4 of the coaxial cable 1 and the inner cylinder 32 of the shell 30 are brought into close contact with each other.

In this way, a predetermined connector mounting structure is obtained, and the coaxial cable 1 is connected to a predetermined device via the connector 10.

In the above-mentioned mounting example, the tightening nut 2 provided with a predetermined member is
0, the taper clamp 40, and the shell 30 were assembled in sequence, but as another example of attachment, the tightening nut 20, the taper clamp 40, and the shell 30 were assembled loosely, and the connector lO in this assembled state was coaxially assembled. After being attached to the end of the cable l, the tightening nut 20 and the shell 30 may be strongly tightened.

The dimensions of the tightening ring 50 having a shape memory function, excluding its inner diameter, can be set as freely as possible, and if necessary, a plurality of tightening rings 50 may be placed adjacent to each other in the axial direction to fit inside the taper clamp 40. It can also be provided on the circumferential surface, in which case the axial movement of each tightening ring 50 is restrained.

In addition, when the terminal of the coaxial cable 1 is processed so that the jacket 5 covers the tip of the external conductor 4 as shown by the imaginary line in FIG.
0 is attached to the outer circumference of the terminal of the coaxial cable 1.

At this time, the inner diameter of the taper clamp 40 and the inner diameter of the tightening ring 50 are set corresponding to the outer diameter of the jacket 5 of the coaxial cable 1, and the end of the coaxial cable l is connected from the outer periphery of the jacket 5 to the taper clamp 40. , is pressurized via the tightening ring 50.

As described above, these coaxial cables 1 and connectors 1O are fastened to each other by the tightening force mainly provided by the taper clamp 40 when there is no temperature rise.

When the temperature rises, the tightening ring 50 made of shape memory alloy
are fastened to each other through the

r Effects of the Invention J As explained above, the coaxial cable connector according to the present invention includes a tightening ring having a shape memory function on the inner peripheral surface of the taper clamp located in the internal space between the tightening nut and the shell. Therefore, the clamping ring with shape memory function can reliably clamp the coaxial cable without contact failure even under usage conditions that involve a rise in temperature, resulting in high reliability.

[Brief explanation of the drawing]

FIG. 1 is an upper cutaway front view showing an embodiment of the coaxial cable connector according to the present invention, and FIG. 2 is an upper cutaway front view of the taper clamp according to the present invention. FIG. 3 is a side view of the tightening ring according to the present invention, and FIG. 4 is a front view with an upper cutaway showing an example of terminal treatment of a coaxial cable. Reference 1... Φ... Coaxial cable 2... Center conductor of coaxial cable 3...
Inner insulation layer of coaxial cable 4...Outer conductor of coaxial cable 5...Sheath 10 of coaxial cable...Connector 20...Tightening nut 30... War... Φ shell 40... Taper clamp 41... Taper clamp concave groove 50...
・Tightening ring 51... Tightening ring separation part agent Patent attorney Yoshio Saifuji

Claims (3)

[Claims] (1) In a coaxial cable connector in which a taper clamp for clamping the outer periphery of the tip of the coaxial cable is interposed in the internal space between a tightening nut and a shell that are connected in the axial direction, the reduced diameter shape in a high temperature state is A connector for a coaxial cable, characterized in that a tightening ring having a shape memory function is provided on the inner circumferential surface of the taper clamp and is restrained from moving in the axial direction. (2) The coaxial cable connector according to claim 1, wherein a concave groove extending in the circumferential direction is formed on the inner circumferential surface of the taper clamp, and a tightening ring is fitted into the concave groove. (3) The coaxial cable connector according to claim 1 or 2, wherein the tightening ring has an open loop.