JPH0113337Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a high frequency coaxial connector for CATV that can be applied to various types such as BNC, N, M, TNC, F, and FT types.

<Prior art> For example, in a conventional N-type connector, a tightening fitting is attached to the outer sheath of a terminal-treated coaxial cable, and a threaded part on the outer circumferential surface of one end of the tightening fitting and a threaded part on the inner circumferential surface of one end of the shell are connected to each other. are screwed together, and the outer conductor of the coaxial cable is crimped using a taper clamp loaded so that it is covered by the inner peripheral surface corresponding to the threaded part of the tightening fitting and the inner peripheral surface of the threaded part of the shell, respectively. , and fix the tip of the center conductor of the coaxial cable to the center contact in the shell, and attach the connection nut attached via a gasket to the outer circumferential surface of the shell so as to cover the end of the shell, on the equipment side such as an amplifier. It was connected to a receptacle.

<Problems with the prior art> However, when the conventional N-type connector described above is applied to connect a coaxial cable to equipment or other coaxial cables, if the coaxial cable is twisted due to the influence of wind, etc., the connector may be damaged. As a result, the screwing relationship between the connected parts becomes loose, resulting in poor connection of the connecting portion and deterioration of electrical characteristics such as impedance.

<Purpose of the present invention> The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.The purpose of the present invention is to ensure that the connector attached to the coaxial cable remains intact even if the coaxial cable is twisted due to the influence of wind, etc. A high-frequency coaxial connector that never loosens the screwing relationship between the parts that make up the connector, maintains a tight screwing relationship, eliminates poor connection at the connection part, and prevents deterioration of electrical characteristics. The goal is to provide the following to the public.

<Structure of the present invention> In order to achieve the above object, the present invention forms a tapered part on the inner circumferential surface of a fastening fitting attached to the outer sheath of a terminal-treated coaxial cable, and a threaded part on the outer circumferential surface thereof. Then, a taper clamp that is fitted so as to be in pressure contact with the tapered part in the clamping fitting is crimped onto the outer conductor of the coaxial cable, and a taper clamp is attached to the base side of the taper clamp through the stepped part so as to protrude from the clamping fitting. A cylindrical body with a larger diameter is integrally formed, a protrusion is provided on the outer circumferential surface of the tip of the cylindrical body, and a connecting nut is provided that is screwed into the threaded part of the tightening fitting so as to cover the cylindrical body. This is a high frequency coaxial connector having a structure in which a plurality of concave grooves are provided along the axial direction in the threaded portion of the inner circumferential surface of the shell, into which the plurality of protrusions are slidably fitted. Hereinafter, the configuration of the present invention will be explained based on one embodiment.

<Embodiment> Reference numeral 1 denotes a tightening fitting having a cylindrical structure with a polygonal side surface having a tightening part 1a, and a threaded part 2a on the inner circumferential surface of one end of a shell 2 and a screw on the right end of the outer circumferential wall thereof. While forming a threaded portion 1b that fits together, the tightening fitting 1
The left side 1c of the inner circumferential wall is a hole with a diameter that allows the coaxial cable A to be loosely inserted through it, and the right side 1d of the inner circumferential wall has a diameter that is large enough for the thickness of the part of the coaxial cable A excluding the outer jacket B to pass through. A tapered surface 1f is formed that gradually widens toward the end via the annular step 1e.

A plurality of button-shaped protrusions 3b provided on the outer peripheral surface of the tip of a cylindrical body 3a integrally formed with a taper clamp 3 (described later) are fitted into the threaded portion 2a of the inner peripheral wall of one end of the shell 2 while sliding. A plurality of grooves 2f are provided along the axial direction (this example shows a case in which two grooves 2f are provided), and a groove having approximately the same diameter as the threaded portion 2a is provided on the extension of the terminal end of the threaded portion 2a. A threading allowance 2b is provided, and a groove 2f' is also formed in the threading allowance 2b on the same extension line as the groove 2f. Further, the inner circumferential wall 2c of the shell 2 on the side opposite to the threaded portion 2a is formed with a hole having approximately the same diameter as the annular step portion 1e via a step portion 2d, and the hole projects outward from the shell 2 into a cylindrical protruding body 2e. It communicates with the same diameter.
The outer peripheral surface of shell 2 has a tapered portion 2g on one end side.
A tightening portion 2h to be tightened with a spanner (not shown) is formed in the middle thereof, and an annular groove 2i in which a retractable metal retaining ring 6 is fitted is formed at the other end. Reference numeral 3 designates a taper clamp, which has a tapered surface 3c formed at one end of its outer circumferential surface so as to contract by pressing against the tapered surface 1f in the clamping fitting 1, and is provided with a slit 3d, and its corresponding inner circumferential surface is coaxial. The diameter of the hole is set to be crimped to the outer conductor C of the cable A, and a screw 3e or a non-slip uneven part is formed on the inner peripheral surface (in this example, since the coaxial cable A has a spiral shape, a screw thread is formed on the inner circumferential surface of the hole. (The case where a matching screw 3e is provided will be explained). Further, the inside of the cylindrical body 3a formed integrally with the taper clamp 3 has a hole diameter approximately the same as that of the left side 1c of the inner circumferential wall of the tightening fitting 1 through the stepped portion 3f, and the outer circumferential surface of the cylindrical body 3a is formed on the outer circumferential surface of the shell 2. The cylindrical body 3a is covered with an inner circumferential wall corresponding to the threaded part 2a, and has a plurality of (two in this example) shaped protrusions 3b on the outer circumferential surface of the tip end of the cylindrical body 3a.
establish. Reference numeral 4 denotes a connecting nut which is caulked to the shell 2 in a contracted state so as to cover the outer peripheral surface of one end of the shell 2 and the cylindrical body 3a, and has a threaded portion 4a in the middle of its inner peripheral wall. At the same time, a gasket 7 is installed in the inner circumferential wall located between the stepped portion 4b at the end of the threaded portion 4a and the end surface of the shell 2. 5 is a center contact consisting of a conductor receiving part 5a and a pin part 5b;
On the a side, an annular insulator 8 is arranged so as to be loosely fitted into the cylindrical body 3a of the taper clamp 3 and the cylindrical protrusion 2e of the shell 2, and is attached to the outer peripheral surface of the conductor receiving part 5a. It is housed in the cylindrical body 3a of No. 3. The pin portion 5b is also accommodated in a loose fit on the axis within the cylindrical protrusion 2e. In the figure, D indicates the insulator of coaxial cable A, and E indicates the internal conductor.

<Operation> Next, a case will be described in which the high frequency coaxial connector having the above configuration is attached to a coaxial cable A whose terminals have been treated as shown in FIG. 3. First, the conductor receiving portion 5a of the center contact 5 is fitted onto the tip of the internal conductor E of the coaxial cable A and crimped and fixed from the outside. Next, insert the clamping metal fitting 1 into the cable A from its clamping part 1a side, insert it until the annular stepped part 1e inside the metal fitting 1 abuts the end of the outer sheath B, and screw the screw 3e inside the taper clamp 3. is screwed onto the threaded external conductor C of the cable A, and inserted while the outer circumferential surface of the taper clamp 3 is brought into sliding contact with the tapered surface 1f of the right inner circumferential wall 1d of the fastening fitting 1. After attaching the taper clamp 3 to the coaxial cable A, insert the protrusion 3b formed at the tip of the outer peripheral surface of the cylindrical body 3a integrally formed with the taper clamp 3 into each of the threaded part 2a and the screw allowance 2b of the inner peripheral wall 2c of the shell 2. The formed grooves 2f, 2
f' and tighten the threaded part 1b of the fastening fitting 1 and the threaded part 2a of the shell 2 using a jig such as a wrench, the protrusion 3b and the groove 2f into which it fits, 2f', the cylindrical body 3a of the taper clamp 3 and the shell 2 are combined and rotated, and when both the clamping fitting 1 and the shell 2 are tightly screwed together, the outer peripheral surface of the taper clamp 3 It enters the tapered surface 1f of the right side 1d of the inner circumferential wall of the fastening fitting 1 in a further biting state,
The taper clamp is tightly crimped onto the outer conductor C of the coaxial cable A. This completes the installation of the coaxial connector to the coaxial cable. After that, the connecting nut 4 side can be connected to a device (not shown) or another coaxial cable or the like.

<Effects of the present invention> As can be seen from the above description, in the present invention, the taper clamp and the shell are integrally connected via the protrusion and the groove into which the protrusion fits, so that the coaxial cable is protected from wind. Even if the coaxial cable and connector are twisted due to the influence of It has excellent effects such as eliminating poor connection at the connection part and preventing deterioration of electrical characteristics.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing the coupling relationship between the taper clamp and the shell according to the present invention, Fig. 2 is a sectional view showing an embodiment of this invention, and Fig. 3 is a sectional view of a coaxial cable with terminal treatment. It is. 1... Tightening metal fitting, 2... Shell, 2f... Concave groove, 3... Taper clamp, 3a... Cylindrical body,
3b...Protrusion, 4...Connection nut, 7...Gasket, A...Coaxial cable, B...Sheath, C...
...outer conductor.

Claims (1)

[Scope of utility model registration request] A tapered part is formed on the inner circumferential surface of a fastening fitting attached to the jacket of the terminal-treated coaxial cable, and a threaded part is formed on the outer circumferential surface of the fastening fitting, and the fitting is fitted so as to be in pressure contact with the tapered part in the tightening fitting. A taper clamp is crimped to the outer conductor of the coaxial cable, and a cylindrical body having a larger diameter than the taper clamp is integrally formed on the base side of the taper clamp through a step so as to protrude from the clamping fitting, and the tip of the cylindrical body is A plurality of protrusions are provided on the outer circumferential surface of the shell, and the plurality of protrusions are provided on the threaded portion of the inner circumferential surface of a shell with a connecting nut that is screwed into the threaded portion of the tightening fitting so as to cover the cylindrical body. A high frequency coaxial connector characterized by having a plurality of concave grooves along the axial direction into which the protrusions are fitted while sliding.