JP2001093627A - Coaxial connectors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide coaxial connectors with which performance is improved and cost can be reduced. SOLUTION: This connector has an inside contact 1 and an outside contact 2, which are respectively connected with an inside conductor 31 and an outside conductor 32 of a coaxial cable C with the inside conductor 31 and the outside conductor 32 which is mutually insulate and placed concentrically. The inside contact 1 has the self-tapping screw section 4 to tap into the inside wall surface of the hollow inside conductor 31. At the tip of this self-tapping screw section 4, a guide section is formed in parallel with the pivot P and formed so that the guide section has the outside diameter dimension almost the same as the inside diameter dimension of the inside conductor 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coaxial connector used for a coaxial cable.

[0002]

2. Description of the Related Art Conventionally, internal conductors insulated from each other
A coaxial cable having an outer conductor concentrically has a coaxial connector having an inner contact and an outer contact connected to the inner conductor and the outer conductor, respectively, at the end thereof, so that the coaxial cable can be mechanically connected to each other or to a communication device. And electrical connection is made possible. In this conventional coaxial connector, the internal contact has a male screw portion at the connection end with the internal conductor of the coaxial cable, and at the time of connection, a threaded tap is used on the inner peripheral surface of the hollow internal conductor. The male screw portion of the internal contact was screwed into the screw hole of the internal conductor.

[0003]

However, it is troublesome to screw the inner conductor of the coaxial cable at the time of connection as described above, and it is particularly troublesome in places where work is difficult, such as the top of a mountain, the roof of a building, or the top of a steel tower. The work efficiency was remarkably reduced in the mounting work. In addition, it is necessary to manufacture a thread cutting tap according to the inner diameter of the internal conductor, and the cost is increased accordingly.

Accordingly, an object of the present invention is to provide a coaxial connector capable of improving workability and reducing costs.

[0005]

In order to achieve the above object, a coaxial connector according to the present invention comprises a coaxial cable having concentrically insulated inner and outer conductors. The internal contact has a self-threading screw portion that is screwed into the inner peripheral surface of the hollow internal conductor, and a tip of the self-threading screw portion. Has a guide portion formed in an outer diameter dimension parallel to the axis and substantially equal to the inner diameter dimension of the inner conductor.

[0006] In addition, a thread at a base end side of the guide portion of the tapping screw portion is cut obliquely at a predetermined angle to form a biting portion. Further, an outer flange-shaped contact portion is provided near the base end of the tapping screw portion of the internal contact, and the tapping screw portion is screwed into the inner conductor so that the contact portion comes into contact with the end surface of the inner conductor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows an embodiment of the coaxial connector of the present invention. FIG. 2 shows a state where the coaxial connector Y is attached to the end of the coaxial cable C. The coaxial cable C includes a hollow inner conductor 31, an annular outer conductor 32, an insulator 33 made of a foam material (foamed plastic) provided between the inner conductor 31 and the outer conductor 32, and an outer conductor 32. And a cover member 34 that is externally fitted to the
, The inner conductor 31 and the outer conductor 32 are held concentrically.

Thus, the coaxial connector Y of the present invention comprises an internal contact 1, an external contact 2 fitted externally to the internal contact 1, an internal contact 1 and an external contact 2
And a short cylindrical insulator 3 provided between the
, The internal contact 1 and the external contact 2 are held concentrically.

As shown in FIGS. 1 to 3, the internal contact 1 is self-threaded at the connection end of the coaxial cable C with the internal conductor 31 (by self-tapping) on the inner peripheral surface 35 of the internal conductor 31. It has a tapping screw part 4 to be screwed in and a connection terminal 5 having a plurality of slits formed at the other end. The other end of the tapping screw portion 4 is provided with an outer flange-shaped contact portion 6 that comes into contact with the end surface 24 of the inner conductor 31 (see FIG. 6), and the other end of the contact portion 6 is provided with an insulator. 3 is formed with a concave peripheral groove 7 to be fitted to the inner peripheral edge.

As shown in FIGS. 1 to 4, the tapping screw portion 4 is made of, for example, phosphor bronze which is hard and has excellent wear resistance.
And a guide portion 8 having an outer diameter substantially equal to the inner diameter of the inner conductor 31 of the coaxial cable C. Further, a biting portion 9 is formed by cutting the thread 10 obliquely at a predetermined angle θ (for example, 2 °) on the base end 4b side of the guide portion 8 of the tapping screw portion 4. The screw thread 10 at the base end 4b of the tapping screw portion 4 is left without being cut. That is, the biting portion 9 is formed by leaving the thread 10 of the base end 4b in the parallel screw, and then the biting portion 9 of the tip 4a is connected to the axis P.
The guide portion 8 is formed by cutting in parallel with the above.

As shown in FIGS. 1 and 2, the external contact 2 is externally fitted to the internal contact 1 via an insulator 3, and a female screw portion 13 is formed on the inner peripheral surface of the large diameter portion 12 at one end. A second connecting cylinder 15 having a male thread 14 screwed to the female thread 13 of the first coupling cylinder 11 on the outer peripheral surface of the small diameter portion 16 on the other end side; A split clamp 21 comprising a pair of arcuate half-pieces 22, 22 which are fitted inside the small-diameter portion 16 of the two-connection cylinder 15.
And. The split clamp 21 has a pair of arc-shaped projections 21a provided on the inner surfaces of the respective halves 22, 22 at a predetermined pitch in the axial direction (the same pitch as the valley of the outer conductor 32 of the coaxial cable C). , 21a.

A concave groove is provided along an opening edge on one end side of the second connection cylinder 15, and an O-ring 17 is fitted into the concave groove and an O-ring is provided near the groove. 18 are arranged. An O-ring 19 is provided between the first connection cylinder 11 and the second connection cylinder 15, and an O-ring 20 is also provided between the first connection cylinder 11 and the insulator 3.

Next, an example of a procedure for mounting the thus configured coaxial connector Y to the coaxial cable C will be described with reference to FIGS.
First, a predetermined portion of the coaxial cable C (between the crest and the valley of the outer conductor 32) is cut, and the cover member 34 is cut off by a predetermined length from the cut surface to form an outer conductor.
Expose 32. On the other hand, the coaxial connector Y is disassembled into an internal contact 1 and an external contact 2 that are integral with the insulator 3.
And a second connecting cylinder 15 having O-rings 17 and 19, and a split clamp 21 (half split bodies 22 and 22).

Then, as shown in FIG. 4, the tip 4a of the tapping screw portion 4 of the internal contact 1 is connected to the coaxial cable C.
Is inserted into the internal conductor 31 at the end. At this time, since the guide portion 8 of the tapping screw portion 4 is fitted tightly (not obliquely) along the inner peripheral surface 35 of the inner conductor 31, the tapping screw is coaxial with the axis P 'of the inner conductor 31. The part 4 is positioned.

Then, as shown in FIG. 5, the biting portion 9 of the tapping screw portion 4 is self-threaded and screwed into the inner peripheral surface 35 of the inner conductor 31. At this time, the screwing torque (screwing resistance) is reduced by the biting portion 9, and the tapping screw portion 4 can be screwed straight in accordance with the axis P 'of the inner conductor 31. And FIG.
As shown in FIG. 6, the screw is completely screwed down to the thread 10 at the base end 4b of the tapping screw portion 4. When the end surface 23 of the contact portion 6 of the internal contact 1 comes into contact with the end surface 24 of the internal conductor 31, the screwing is started. Complete. That is, the attachment of the internal contact 1 to the internal conductor 31 is completed.

Next, as shown in FIG. 2, the O-ring 18 is externally fitted to the valley of the outer peripheral surface of the exposed external conductor 32, and the cut end of the coaxial cable C is The second connection cylinder 15 is inserted into the two connection cylinders 15, and once moved to the cover member 34 side. Then, each half body 22, 22 of the split clamp 21 is connected to an arc-shaped projection 21a, 21a by an external conductor.
The external connection is fitted to the outer conductor 32 in a state of contacting the valley at the end of the end 32, and the second connection cylinder 15 is moved toward the end of the coaxial cable C to hold the split clamp 21 outside.

Thereafter, the female thread 13 of the first connection cylinder 11 is screwed into the male thread 14 of the second connection cylinder 15 and tightened, so that the first connection cylinder 11 is moved to the split clamp 21 side. And the end faces of the split clamp 21 and the outer conductor 32 come into contact with the stepped portion 25 of the first connection cylinder 11. Thereby, the attachment of the external contact 2 to the external conductor 32 is completed (the attachment of the coaxial connector Y to the coaxial cable C is completed).

As shown in FIG. 7, the coaxial connector of the present invention has
The base end 4b side of the guide portion 8 may be a tapered screw portion 26. The taper angle θ of the tapered screw portion 26 is the same angle (for example, 2 °) as that of the biting portion 9 (described with reference to FIG. 3). As shown in FIGS. 3 and 7, the outer diameter of the guide portion 8 is set to be equal to or smaller (smaller) than the root diameter of the screw of the biting portion 9 as shown by a virtual line E.
preferable.

[0020]

Since the present invention is configured as described above, the following effects can be obtained.

According to the first aspect of the present invention, when attaching the coaxial connector to the coaxial cable C, the time required for threading the inner peripheral surface 35 of the inner conductor 31 of the coaxial cable C using a threading tap is omitted. In addition, the installation time is shortened to improve the workability, and a thread cutting tap (operation) is not required, so that the cost is reduced. Further, the guide portion 8 of the tapping screw portion 4 of the internal contact 1 allows the tapping screw portion 4 to be positioned on the same axis with the internal conductor 31, and the tapping screw portion 4 to be smoothly and straightly screwed into the internal conductor 31. .

According to the second aspect of the present invention, when the self-threading of the tapping screw portion 4 of the internal contact 1 into the internal conductor 31 of the coaxial cable C is performed by screwing, the screwing torque (threading resistance) is reduced, and the force is smooth with a light force. Can be screwed.

In the coaxial connector attached to the coaxial cable C, the contact portion 6 of the internal contact 1 is in contact with the inner conductor 31 of the coaxial cable C. Is reliably formed.

[Brief description of the drawings]

FIG. 1 is a half sectional front view showing an embodiment of the present invention.

FIG. 2 is a half sectional front view showing a state of being attached to an end of a coaxial cable.

FIG. 3 is an enlarged sectional view of a main part showing a tapping screw part of an internal contact.

FIG. 4 is an enlarged sectional view of a main part showing a state where a guide part of a tapping screw part is inserted into an internal conductor.

FIG. 5 is an enlarged sectional view of a main part showing a state in which a biting portion of the tapping screw portion is screwed into an internal conductor.

FIG. 6 is an enlarged sectional view of a main part showing a state in which the screwing of the tapping screw portion is completed.

FIG. 7 is an enlarged sectional view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal contact 2 External contact 4 Self-tapping screw part 4a Tip 4b Base end 6 Contact part 8 Guide part 9 Biting part 10 Thread 24 End face 31 Internal conductor 32 External conductor C Coaxial cable P Axis θ Predetermined angle

Claims (3)

[Claims] 1. A coaxial connector having an inner contact and an outer contact respectively connected to the inner conductor and the outer conductor of a coaxial cable having concentrically insulated inner and outer conductors. Has a self-threading self-threaded tapping screw portion on the inner peripheral surface of the hollow inner conductor, and has a tip with an outer diameter parallel to the axis and substantially equal to the inner diameter of the inner conductor. A coaxial connector having a formed guide portion. 2. The coaxial connector according to claim 1, wherein a thread at a base end side of the guide portion of the tapping screw portion is cut obliquely at a predetermined angle to form a biting portion. 3. The internal contact according to claim 1, wherein an outer flange-shaped contact portion is provided near the base end of the tapping screw portion, and the tapping screw portion is screwed into the internal conductor so that the contact portion comes into contact with an end surface of the internal conductor. 3. The coaxial connector according to 1 or 2.