JPH0855654A - Coaxial cable connector - Google Patents

Abstract

(57) [Summary] [Purpose] The connection work should be simple and reliable for long-term use. This coaxial cable connector 1 includes a nut 2 externally fitted to an outer coating 106 of a coaxial cable 100, a first clamp cylinder 4 externally fitted to a metal coating exposed portion 108 of a cable end portion, and a cable end. Is externally fitted to the outer conductor exposed portion 107 of the portion, and is covered with the first clamp cylinder 4 by the metal coating 105.
The second clamp barrel 5 that holds the first clamp barrel 4 and the second clamp barrel 4 are connected to the nut 2 with the first and second clamp barrels 4 and 5 sandwiched therebetween, and the outer conductor 103 is provided between the inner peripheral side and the second clamp barrel 5. And a connector main body 3 for sandwiching. And nut 2
First and second O-rings 7 and 8 are provided between the outer cover 106 and the outer cover 106, and between the nut 2 and the connector body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable connector which is attached to a coaxial cable in which a metal coating is provided around an outer conductor via an inner coating and an outer coating is provided around the metal coating.

[0002]

2. Description of the Related Art Generally, some coaxial cables are provided with a metal coating on the outside for the purpose of enhancing the electromagnetic shielding effect and enhancing the mechanical strength against tension. That is, in the coaxial cable 100, as shown in FIGS. 3 and 4, the outer conductor 103 is provided around the inner conductor 101 via the insulator 102, and the inner coating 104 is provided around the outer conductor 103. A metal coating 105 made of annealed copper braid (for shielding effect) and iron wire braid (for mechanical strength reinforcement) is provided, and an outer coating 106 is provided around the metal coating 105.

Conventionally, as a connector attached to such a coaxial cable 100, there is a connector shown in FIG. This connector 50 includes a gasket ring 5 made of silicone rubber on the other end of the nut 51 of the coaxial cable 100.
3 and the clamp cylinder 54 are sequentially fitted onto each other, and then the female screw 55a of the connector body 55 is screwed into the male screw 51b provided at the other end of the nut 51, whereby the outer conductor 103 is clamped to the clamp cylinder 54 and the connector body. It is clamped and fixed between the metal plate 56 and the metal plate 56 attached to the inner peripheral portion of 55. Further, one end of the nut 51 fitted onto the connection end of the coaxial cable 100 is made to sneak between the outer coating 106 and the metal coating 105, and then the coupling cap that has been fitted onto the coaxial cable 100 in advance. By screwing the female screw 52 a of 52 to the male screw 51 a provided at one end of the nut, the metal coating 105 is clamped and fixed by the nut 51 and the coupling cap 52.

When the female screw 55a of the connector body 55 is screwed onto the male screw 51b provided at the other end of the nut 51, the external conductor 103 is directly connected by the screw connecting force between the connector body 55 and the nut 51. The outer conductor 103 is sandwiched by the elastic restoring force of the gasket ring 53 generated by deforming the gasket ring 53 by this screw coupling force. The gasket ring 53 expands and contracts inward and outward in the radial direction by this elastic return force, thereby sealing the connection end of the coaxial cable 100.

Further, in FIG. 3, reference numeral 57 is a center contact that is supported and fixed inside the connector body 55 via an insulating insulator 58 and is connected to the inner conductor 101, and 59 is connected to the outer conductor 103 to the connector body. External contacts connected via 55.

Conventionally, as this type of connector, there is one shown in FIG. In this connector 70, a nut 71, a gasket ring 72 made of silicon rubber, and a clamp tube 73 are sequentially fitted onto the connection end of the coaxial cable 100, and the end of the metal coating 105 is expanded outward to expand the nut 71. And the gasket ring 72, and further, the outer conductor 103 is expanded outward so as to be attached to the outer peripheral surface of the clamp cylinder 73. Then, by screwing the male screw 71a provided on the nut 71 with the female screw 74a of the connector main body 74, the metal coating 105 is sandwiched and fixed by the nut 71 and the gasket ring 72, and the outer conductor 1
03 is clamped and fixed between the clamp cylinder 73 and the inner peripheral portion of the connector body 71. At this time, the external conductor 10 is directly connected by the screw connecting force between the connector body 74 and the nut 71.
3, the outer conductor 103 and the metal coating 105 are sandwiched by the elastic restoring force of the gasket ring 72 generated by deforming the gasket ring 72 by the screw coupling force. The gasket ring 53 expands and contracts inward and outward in the radial direction by the elastic deformation at this time, thereby sealing the connection end of the coaxial cable 100.

In FIG. 4, reference numeral 75 is a center contact that is supported and fixed inside the connector body 74 via an insulating insulator 76 and is connected to the inner conductor 101, and 77 is connected to the outer conductor 103 on the connector body. 78 is a nut 71 which is an external contact connected via 74.
And the metal coating 105 and between the metal coating 105 and the gasket 72.

[0008]

However, such a conventional example has the following problems. That is, FIG.
In the above, the metal cap 105 and the outer conductor 103 are connected through two steps of connecting the nut 51 to the connecting cap 52 and connecting the nut 51 to the connector body 55. However, since such two steps are required, there is a problem that the connecting work is troublesome and time consuming.

Further, the connector 50 has a structure in which the outer conductor 103 is clamped and fixed by an elastic restoring force generated by deforming the gasket ring 53 with a screw connecting force between the connector body 55 and the nut 51. Has become. Therefore, when the gasket ring 53 changes over time and its elastic force is attenuated, the force for holding the outer conductor 103 is weakened, and the connection becomes uncertain. That is, the reliability for long-term use was insufficient.

Further, in the structure shown in FIG. 4, the nut 71 is connected to the metal cover 105 and the outer conductor 103 only by the process of connecting the nut 71 to the connector body 74.
Although it is possible to save the labor and time of the connecting work as compared with the one described above, the elastic return force generated by deforming the gasket ring 72 by the screw connecting force between the connector main body 74 and the nut 71 is used. Therefore, the outer conductor 103 and the metal coating 105 are sandwiched and fixed. That is, the structure for fixing the outer conductor 103 and the metal coating 105 is similar to the structure for fixing the outer conductor 103 in FIG. Therefore, when the gasket ring 72 changes with time and its elastic force is attenuated, the force for sandwiching the outer conductor 103 and the metal coating 105 is weakened, and its fixing and electrical connection become uncertain, that is,
There was a problem that it could not obtain sufficient reliability for long-term use.

Therefore, it is an object of the present invention to provide a connector for a coaxial cable, which does not require labor and time for connection work, and which is reliable for long-term use.

[0012]

In order to achieve such an object, in the present invention, a metal coating is provided around an outer conductor via an inner coating, and an outer coating is provided around the metal coating. A connector for a coaxial cable, which is attached to a coaxial cable in which an outer conductor exposed portion and a metal coating exposed portion are formed in the axial direction from the cable end portion when the connector is attached, The first connection cylinder to be fitted, the first clamp cylinder to be externally fitted to the metal coating exposed portion, and the first clamp cylinder to be externally fitted to the outer conductor exposed portion, and the metal coating is provided between the first clamp cylinder and the first clamp barrel. The second clamp cylinder to be sandwiched and the first and second clamp cylinders.
And a second connection tube that is connected to the first connection tube while sandwiching the clamp tube, and that holds an outer conductor between the inner peripheral side and the second clamp tube, and It is characterized in that a first annular sealing portion is provided between the first connecting cylinder and the outer cover, and a second annular sealing portion is provided between the first connecting cylinder and the second connecting cylinder.

[0013]

When the second connecting tube is connected to the first connecting tube, the outer conductor is firmly gripped by the inner peripheral side of the second connecting tube and the second clamp tube and is connected to this connector. Further, the metal coating is firmly gripped by the second clamp barrel and the first clamp barrel and is connected to this connector. At this time, the first clamp cylinder and the second clamp cylinder and the second clamp cylinder and the inner peripheral side of the second connection cylinder are directly crimped to each other by the connecting force of both the connection cylinders, whereby the metal coating and the outer conductor are Since the connection is fixed, the force for fixing the connection hardly diminishes with time.

Further, the gap between the outer coating and the first connecting cylinder is sealed by the first annular sealing portion, and water or the like does not enter the inside of the connector through this gap. In addition, the gap between the first connecting cylinder and the first connecting cylinder is sealed by the second annular sealing portion, and water or the like does not enter the connector through this gap.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway side view showing the structure of a coaxial cable connector according to an embodiment of the present invention. The coaxial cable 100 to which the connector 1 is attached has a metal coating made of annealed copper wire braid (for shielding effect) or iron wire braid (for mechanical strength reinforcement) around the outer conductor 103 with the inner coating 104 interposed therebetween, as in the conventional example. The outer coating 106 is provided around the metal coating 105.

Further, when the connector is attached, the coaxial cable 100 is processed as follows. That is, from the end of the cable in the axial direction,
The outer conductor exposed portion 107 and the metal coating exposed portion 108 are formed. The metal coating exposed portion 108 is formed by stripping the outer coating 106 over the entire circumference of the cable. The outer conductor exposed portion 107 is formed by stripping the outer coating 106, the metal coating 105, and the inner coating 104 over the entire circumference of the cable.

The connector 1 is attached to the coaxial cable 100 processed in this way, and includes a nut (corresponding to a first connecting cylinder in claims) 2 and a connector body (corresponding to a second connecting cylinder in claims). ) 3 and the first,
The second clamp cylinders 4 and 5 are provided.

The nut 2 is made of a tubular body made of a conductive material (for example, brass plated with nickel), and the coaxial cable 1
00 on the outer coating 106. A male screw 2 a is formed on the outer circumference of the nut 2. The first clamp cylinder 4 has an inner diameter equal to the outer diameter of the metal coating exposed portion 108, an axial length equal to the width of the metal coating exposed portion 108, and a conductive material having a flange 4a at one end (for example, It consists of a silver-plated brass ring body and has a flange 4
It is externally fitted on the metal coating exposed portion 108 with a being the nut 2 side. The outer diameter of the flange 4a is slightly larger than the inner diameter of the nut 2.

The second clamp barrel 5 has an outer conductor exposed portion 10
From a ring body of a conductive material (for example, brass plated with silver) having an inner diameter equivalent to the outer diameter of 7 and an axial length slightly shorter than the width of the exposed outer conductor portion 107 and having a flange 5a at one end. It is fitted onto the outer conductor exposed portion 107 with the end portion of the metal coating 105 being sandwiched between the flange 5a and the first clamp cylinder 4. The outer diameter of the flange 5a is slightly larger than the inner diameter of the first clamp cylinder 4. A metal 6 made of an annular body of a conductive material (for example, silver-plated brass) is externally fitted to the cable end side of the outer conductor exposed portion 107, and the end of the outer conductor 103 is formed by this metal. It is sandwiched between 6 and the second clamp cylinder 5.

The connector body 3 is made of a cylindrical body made of a conductive material (for example, brass plated with nickel), and has a female screw 3a corresponding to the male screw 2a formed at one end thereof. The connector body 3 is connected to the nut 2 by screwing the female screw 3a into the male screw 2a. The first clamp cylinder 4 and the second clamp cylinder 5 are housed between the connector body 3 and the nut 2 which are connected in this way. Inside the connector body 3, a step portion 3b having an inner diameter slightly smaller than the outer diameter of the dowel 6 is formed over the entire circumference.
By being connected to, the metal plate 6 is pushed to the nut 2 side by the step portion 3b. On the other hand, the flange 4a of the first clamp cylinder 4 is pushed toward the connector body 3 side by the end portion of the nut 2. Therefore, the end of the metal coating 105 is firmly gripped by the first clamp barrel 4 and the second clamp barrel 5 and connected to the connector 1. Further, the end portion of the outer conductor 103 has the second clamp tube 5
It is firmly gripped by the dowel 6 and is connected to the connector 1, and is also electrically connected to the connector body 3. At this time, the connecting force between the nut 2 and the connector body 3 directly causes the first clamp barrel 4 and the second clamp barrel 5,
In addition, the second clamp cylinder 5 and the metal plate 6 are pressure-bonded to each other, whereby the metal coating 105 and the outer conductor 103 are attached to the connector 1
Since it is connected and fixed to, the force for connecting and fixing the metal coating 105 and the external conductor 103 will not be attenuated unless the male screw 2a and the female screw 3a are loosened.

An O-ring insertion groove 2b is formed on the inner peripheral surface of the nut 2 over the entire circumference, and an O-ring insertion groove 2c is formed on the outer peripheral surface of the nut 2 over the entire circumference. . In these O-ring insertion grooves 2b and 2c,
A first O-ring 7 and a second O-ring 8 each made of a material such as neoprene rubber or silicone rubber are housed. Therefore, the gap between the outer cover 106 and the nut 2 is sealed by the first O-ring 7 so that moisture or the like does not enter the inside of the connector 1 through this gap. The gap between the nut 2 and the connector body 3 is sealed by the second O-ring 8 so that moisture or the like does not enter the inside of the connector 1 through this gap.

A center contact 10 of a conductive material (for example, silver-plated brass) is supported and fixed inside the connector body 3 via insulating insulators 9A, 9B, 9C, and the tip of the inner conductor 101 is fixed. Is connected to this central contact 10. An external contact 11 made of a conductive material (for example, nickel-plated brass) is attached to the tip end side of the connector body 3. The external contact 11 is electrically connected to the external conductor 103 via the connector body 3 and the metal plate 6. Further, a coupling 12 is rotatably attached to the connector body 3 on the tip side of the connector body 3.

Next, a work process of attaching the connector 1 having the above-described structure to the coaxial cable 100 will be described.

As shown in FIG. 2A, the coaxial cable 1
The outer coating 106 at the end of the cable of 00 is cut by a predetermined width to expose the end of the metal coating 105. At this time,
Be careful not to damage the metal coating 105. Further, the braid at the exposed end of the metal coating 105 is unraveled. Then, the end of the metal cover 105 that has been unraveled is sunk inward, and the nut 2 and the first portion are attached to the end of the coaxial cable 100.
The clamp tube 4 and the clamp tube 4 are fitted in order. The flange 4a of the externally fitted first clamp cylinder 4 is brought into contact with the end portion of the outer coating 106.

As shown in FIG. 2B, the metal coating 105
Is folded back to the outer peripheral side of the first clamp cylinder 4, and the ends of the folded metal coating 105 are cut and aligned. In this way, the metal coating exposed portion 108 is formed and the first clamp cylinder 4 is attached.

Then, the inner coating 104 exposed at the end of the cable is cut off to expose the end of the outer conductor 103. At this time, the outer conductor 103 is not damaged. Further, the exposed braid of the end portion of the outer conductor 103 is unraveled. Then, the end portion of the loosened outer conductor 103 is sunk inward so that the end portion of the coaxial cable is
The clamp tube 5 is externally fitted. The flange 5a of the externally fitted second clamp cylinder 5 is brought into contact with the metal coating 105.

The outer conductor 103 is folded back to the outer peripheral side of the second clamp cylinder 5, and the ends of the folded back outer conductor 103 are cut and aligned. In this way, the outer conductor exposed portion 107 is formed and the second clamp cylinder 5 is attached.

Then, as shown in FIG. 2 (c), the metal 6 is fitted on the exposed insulator 102 to form the outer conductor 103.
And the exposed insulator 102 is cut off to expose the internal conductor 101 by a predetermined size. At this time, the inner conductor 101 is not damaged.

Further, after preliminary solder is formed on the exposed tip of the inner conductor 101, the center contact 10 is fitted on the tip of the inner conductor 101, and the insulating insulator 9A is fitted on the fitted center contact 10. . Be careful not to leave a gap between the insulating insulator 9A and the center contact 10. Then, the center contact 10 is inserted through a solder hole (not shown) provided in the center contact 10.
And the internal conductor 101 are soldered to fix them. In this soldering work, be careful not to melt the insulating insulator 9A by the heat.

After soldering the center contact 10,
The insulating insulator 9B is fitted to the center contact 10. Then, the insulating insulator 9 is previously provided in the inside thereof.
Connect the connector body 3 with C attached to the coaxial cable 1
The insulation insulator 9C
Is externally fitted to the center contact 10, thereby supporting and fixing the center contact 10 in the connector body 3.

Further, the female screw 3 of the connector body 3
By screwing a into the male screw 2a of the nut 2, the connector body 3 and the nut 2 are connected, and thereby the outer conductor 103 is gripped between the metal plate 6 and the second clamp cylinder 5,
Further, the outer cover 106 is gripped by the second clamp cylinder 5 and the first clamp cylinder 4 to connect the connector 1 to the coaxial cable 100 and electrically connect them. In addition, the screwing operation of the connector body 3 and the nut 2 is performed by the coaxial cable 100.
This is done by rotating the nut 2 in order to prevent twisting.

After connecting the coaxial cable 100 to the connector 1, the gap between the connector 1 and the coaxial cable 100 is sealed by the first and second O-rings 7 and 8.
Further, in order to improve the sealing accuracy, a self-bonding tape and an adhesive tape (both not shown) are sequentially wound around the nut 2 and the connector main body 3 to further prevent invasion of moisture, water and the like.

[0033]

As described above, according to the present invention, the first clamp cylinder and the second clamp cylinder, and the second clamp cylinder and the inner peripheral side of the second connection cylinder are directly connected by the connecting force of both the connection cylinders. Since the metal coating and the outer conductor are connected and fixed by crimping each other, the force for connecting and fixing is hardly attenuated by the change with time. Therefore, with time, the force for sandwiching the outer conductor is not weakened and the connection becomes uncertain, and the reliability for long-term use is improved.

Further, since the outer conductor and the outer coating can be connected and fixed by connecting the first connecting cylinder and the second connecting cylinder, there is no inconvenience that the connecting work takes time and effort.

Furthermore, the gap between the outer coating and the first connecting cylinder and the gap between the first connecting cylinder and the first connecting cylinder are the first and the first.
It is sealed by the second annular sealing portion, water or the like does not enter the inside of the connector through these gaps, and the waterproof performance can be sufficiently exerted.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a structure of a coaxial cable connector according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a mounting process of the coaxial cable connector according to the embodiment.

FIG. 3 is a sectional view showing a structure of a coaxial cable connector of a first conventional example.

FIG. 4 is a cross-sectional view showing a structure of a second conventional coaxial cable connector.

[Explanation of symbols]

 1 Connector 2 Nut 2a Male Thread 3 Connector Body 3a Female Thread 4 1st Clamp Tube 5 2nd Clamp Tube 7 1st O Ring 8 2nd O Ring 100 Coaxial Cable 103 Outer Conductor 104 Inner Coating 105 Metallization 106 Outer Coating 107 External Conductor Exposure Part 108 Exposed metal coating

Claims (2)

[Claims] 1. A metal coating is provided around an outer conductor through an inner coating, and an outer coating is provided around the metal coating, and when the connector is attached, the outer conductor is exposed in an axial direction from a cable end. A connector for a coaxial cable to be attached to a coaxial cable in which a portion and a metal coating exposed portion are formed, the first connection tube being externally fitted to the outer coating of the coaxial cable, and the metal connection exposed portion being externally fitted to the first connection cylinder. A first clamp barrel, a second clamp barrel that is fitted onto the exposed portion of the outer conductor, and sandwiches the metal coating between the first clamp barrel, and the first and second clamp barrels. A second connection tube that is connected to the first connection tube in a state and that holds an outer conductor between the inner peripheral side and the second clamp tube, and the first connection tube and the external connection tube. Between the coating Provided with a first annular seal, a connector for coaxial cable, characterized in that a second annular seal between the second connecting tube and the first connecting tube. 2. A male screw portion provided on the outer peripheral portion of the connecting end portion of the first connecting cylinder is screwed with a female screw portion provided on the inner peripheral portion of the connecting end portion of the second connecting cylinder. The second connecting cylinder is connected to the first connecting cylinder, and the second annular sealing portion is provided between the outer peripheral surface of the first connecting cylinder and the inner peripheral surface of the second connecting cylinder. The coaxial cable connector according to claim 1.