JPH0119743B2 - - Google Patents

Description

[Detailed Description of the Invention] <Field of Industrial Application> This invention is based on JIS-C-5410 (General Rules for High Frequency Coaxial Connectors), and is used in outdoor facilities for television communal reception, with a nominal impedance of 75Ω and a voltage of 350V.
(effective value), regarding FT type connectors designed for frequencies below 250 MHz, especially applicable to coaxial cables where the outer conductor is soft, such as aluminum laminate, or hard, such as aluminum sheath. This is what I did.

<Prior Art> The structure of a conventional FT type connector, which is applied when the outer conductor of a cable is soft such as aluminum laminate, will be explained with reference to FIGS. 7 to 10.
1 is a connector body, 2 is an O-ring, 3 is a first insulator provided in the connector body 1, 4 is a third insulator,
5 and 6 are O-rings provided inside and outside the third insulator 4;
7 is a center contact provided inside the connector body 1 so as to partially protrude, 8 is a second insulator inside the connector body 1, 9 is a flanged taper clamp, and 10 is provided on the outside of the flanged taper clamp 9. Clamp, 11
12 is an O-ring that seals between the connector body 1 and the tightening fitting 11, 13 is a tightening clamp provided inside the tightening fitting 11, and 14 is a tightening fitting that presses the surface of the cable A. Gasket 15 indicates a washer interposed between the tightening clamp 13 and gasket 14, respectively.

Therefore, in order to connect cable A to a device (not shown) using the FT type connector having the above structure, first attach the tightening fitting 11, gasket 14, washer 15, and tightening clamp 13 on the outer surface of cable A. Then, insert the clamps 10 one after another. Next, the end of the cable A is terminal-treated using a tool as shown in Figure 9. That is, the inner conductor B is made to protrude beyond the insulator C, the outer conductor D, and the outer sheath E, and the space between the insulator C and the outer conductor D is expanded to form a space F having a triangular cross section. Then, the flanged taper clamp 9 is fitted into the space F (see FIG. 10).
Furthermore, a second insulator 8 is attached to the inner conductor B of the cable A.
is inserted so as to be in contact with the flanged taper clamp 9. After inserting the taper clamp 9, the inner conductor receiving portion 7a of the center contact 7 is fitted into the tip of the inner conductor B of the cable A. After this fitting, the internal conductor B and the center contact 7 are connected by crimping from the outside of the fitting portion. After connecting the center contact 7, the center contact is inserted into the connector main body 1 which includes the first insulator 3, the third insulator 4, and the O-rings 5 and 6, so that the bulge of the center contact 7 3 Insert until it hits the stepped part of the insulator 4. Next, after inserting the clamp 10 into the connector body 1, when the tightening clamp 13 is tightened to the connector body 1, an expanded external conductor is formed between the flanged taper clamp 9 and the clamp 10 located on the outside of the clamp 9. D and the jacket E are sandwiched, and the cable A can be fixed to the connector main body 1. After fixing the cable A, the washer 15 and gasket 14 are moved, and the fastening fitting 11 is screwed onto the connector body 1. This screwing causes the gasket 14 in the clamping fitting 11 to contract, causing the cable A to tighten.
until it is firmly pressed against the outer surface of the After both the connector body 1 and the fastening fitting 11 are fastened, each O-ring 2, 5, 6, 12 is inside the connector.
And the gasket 14 provides a watertight seal.

<Problems to be Solved by the Invention> However, it has been found that when connecting using the conventional FT type connector described above, there are the following drawbacks. That is, connect inner conductor B of cable A to center contact 7.
When connecting, there is still the trouble of having to use a crimping jig such as a tool to crimp.

If the outer conductor D of cable A is soft, such as aluminum laminate, after connecting the tip of the cable to the connector, disconnect cable A during cold seasons such as winter.
As a result of the shrinkage of the outer sheath E, problems such as connection failure occurred.

A gap is created between the insulator C and the external conductor D due to the difference in the inner diameter of the flanged taper clamp 9 and the outer diameter of the insulator C. In addition, the outer conductor D and outer sheath E that have peeled off from the insulator C of cable A are:
Since it is forcibly expanded outward in a tapered shape and is held in the narrow tapered surface between the flanged taper clamp 9 and the clamp 10, embrittlement or cracks may occur at the peeled base of the external conductor D. Not only that, but also the flanged taper clamp 9 and the clamp 10
A large load will be applied to the narrow tapered clamping surface. The combination of the taper structure of the clamp used to hold and fix cable A and the dimensional error of insulator C makes outer conductor D more likely to crack, resulting in disconnected grounding. This will cause electrical characteristics such as impedance and voltage standing wave ratio to go out of order.

Since the outer surface of the cable A is tightly compressed by the gasket 14, the outer surface of the cable is particularly tight when the insulator C of the cable A is made of a soft material such as foamed polyethylene or ultra-high foamed polyethylene. The surface will be significantly constricted compared to the nearby outer surface of the cable. When the outer surface of the cable is greatly constricted by the gasket, electrical characteristics such as impedance and voltage standing wave ratio are impaired, resulting in problems with images.

When connecting a cable to a connector, the parts that make up the connector are separated one by one, and the number of parts required is as many as nine. If there are a large number of parts, there is a risk that the parts may be lost during the connection work, or the parts may be damaged, or the connection work is extremely troublesome, making it difficult for ordinary amateurs to perform the installation work. However, there were some disadvantages, such as the fact that it was limited to specialists.

This invention was made to eliminate the above-mentioned drawbacks all at once.The purpose of this invention is to insert the inner conductor of the terminal-treated cable into the center contact of the connector body, and then tighten it toward the connector body while turning the tightening fitting. Then, the inner conductor of the cable is automatically crimped at the conductor receiving part of the center contact without using any crimping jig, and at the same time, the outer sheath or outer conductor of the cable is also clamped with uniform strength. At the same time, when the cable is connected, the peeled base of the outer conductor of the cable is not damaged in any way, and the outer surface of the cable is completely sealed without adversely affecting the electrical characteristics of the cable. To provide the general public with an FT type connector which can be sealed and can be quickly and easily sealed without losing any parts during cable connection work, even by an ordinary layman.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a structure as shown in the following first invention when the outer conductor D of the cable A is soft such as aluminum laminate. In the case where the outer conductor D of the cable A is hard such as an aluminum sheath, the following second invention is constructed.

That is, the first invention provides a center contact 7 in which a portion of the pin portion 7a is held by the first insulator 3 fitted to the tip portion within the connector body 1 so as to protrude to the outside.
A second insulator 8 is disposed within the connector body 1, which forms a tapered surface 7c on the outer peripheral surface of the end of the conductor receiving portion 7b, and is capable of slidingly contacting the tapered surface 7c to narrow the conductor receiving portion 7b. A back-up ring 20 fitted with a second insulator 8 is provided along the inner circumferential wall of the connector body 1, and adjacent to the back-up spring 20, a slightly tapered thin-walled cylindrical portion 21a and a thick-walled flange 21b are formed on the outer circumferential surface. Taper clamp 21 consisting of
The thick-walled flange 21b is press-fitted into the inner wall of the connector body 1, and a pawl body 22 that penetrates the thick-walled flange 21b and projects from the thick-walled flange 21b is provided on one side of the back-up spring 20, and An annular elastic member 23 and a washer 25 with a spring 24, which can press against the outer sheath E of the cable, are attached to the inner circumferential wall on the cable insertion side of the fastening fitting 11, which is threadedly engaged with the threaded portion 1a on the outer circumferential surface of one end of the clamping fitting 11. The spring 24 is loaded tangentially, and one end is connected to the spring 24.
A split clamp 26 is loosely fitted into the clamping fitting 11 so that it abuts the washer 25, the other end abuts the claw body 22, and is positioned radially outside of the tapered clamp 21. It is an FT type connector.

The second aspect of the invention is a center contact 7 which is held by a first insulator 3 fitted to a tip inside the connector main body 1 so that a part of the pin part 7a protrudes to the outside.
A second insulator 8 is disposed within the connector body 1, which forms a tapered surface 7c on the outer peripheral surface of the end of the conductor receiving portion 7b, and is capable of slidingly contacting the tapered surface 7c to narrow the conductor receiving portion 7b. A back-up spring 20 fitted with a second insulator 8 is provided along the inner circumferential wall of the connector body 1, and near one side of the back-up spring 20 is a cylindrical portion 27a having a length partially protruding from the connector body and a thick cylindrical portion 27a. The thick-walled flange 27b of the reinforcing sleeve 27 consisting of the thick-walled flange 27b is press-fitted into the inner wall of the connector main body 1, and the claw body 2 passes through the thick-walled flange 27b and protrudes from the thick-walled flange 27b.
2 is provided on one side of the back-up spring 20, and presses the outer conductor D of the cable A against the inner circumferential wall on the cable insertion side of the fastening fitting 11 which is threadedly engaged with the threaded portion 1a on the outer circumferential surface of one end of the connector main body 1. The annular elastic member 23 and the clamp 28 to be obtained are loaded so as to be in contact with each other, and the tapered surface 29a on the outer circumferential surface of one end is in sliding contact with the tapered surface 28a on the inner circumferential surface on one side of the clamp 28, and the outer circumference near the other end is A split taper clamp is arranged concentrically on the outside of the reinforcing sleeve 27 so that the tapered surface 29b of the surface slides on the tapered surface 1c of the inner surface of the rear end of the connector body 1, and the other end abuts the claw body 22. 29 is loosely fitted into the fastening fitting 11.

<Function> The function of the first invention configured as described above will be explained.

First, before connecting the cable A to the connector, the terminal of the cable A is processed as shown in FIG. 4a. Next, as shown in FIG. 3a, the tip of the connector body 1 is screwed onto the device K. When the inner conductor B of the cable A is inserted into the conductor receiving part 7b of the center contact 7 with the clamping fitting 11 inserted in advance onto the outer surface of the cable A which has been terminal-treated, the insulation of the cable A is simultaneously removed. A slightly tapered thin-walled cylindrical portion 27 of the taper clamp 21 is placed between the body C and the external conductor D.
a is inserted until both ends of the outer conductor B and outer sheath E of the cable A come into contact with the thick flange 21b of the taper clamp 21. Then, when the tightening fitting 11 is screwed into the threaded portion 1a on the outer peripheral surface of one end of the connector main body 1, the tightening fitting 11
The tip of the split clamp 26 loosely fitted into the connector body 1 abuts the claw body 22 of the backup spring 20 inside the connector body 1, and moves the backup spring 20 along the axial direction. As the back-up spring 20 moves, the second insulator 8 fitted to the back-up ring also moves along the axial direction, and during this movement, the tapered surface 8b of the second insulator 8
contacts the tapered surface 7c formed on the outer peripheral surface of the end of the conductor receiving portion 7b of the center contact 7, narrowing the conductor receiving portion 7b, and as a result, the internal conductor B of the cable A is held against the conductor receiving portion 7b of the center contact 7. It is fixed by pressure welding. The outer conductor D and the outer sheath E at the tip of the cable A are also pressed and fixed between the tapered surfaces between the slightly tapered thin-walled cylindrical portion 21a of the tapered clamp 21 and the split clamp 26 mounted on the clamping fitting 11. . When the tightening fitting 11 is tightened even more,
One end of the split clamp 26 strongly hits the washer 25 with the spring 24, compressing the annular elastic member 23 from the side against the spring force of the spring, and expanding the elastic member toward the center in the radial direction. The outer sheath E of the cable A is brought into tight contact with the cable A. In addition, during cold seasons such as winter, cable A
Even if the outer cover E of
As a result, the outer conductor B and the sheath E at the tip of the cable A are always crimped by the clamps 21 and 26.

The operation of the second invention is also basically the same as that of the first invention. However, since the cable A is designed for a case where the outer conductor D is hard, such as an aluminum sheath, the installation procedure is slightly different. That is, the fourth
As shown in Figure b, the terminal of cable A is processed. Next, as shown in FIG. 3b, the tip of the connector body 1 is screwed onto the device K. When the inner conductor B of the cable A is inserted into the conductor receiving part 7b of the center contact 7 with the clamping fitting 11 inserted in advance onto the outer surface of the cable A which has been terminal-treated, the outer surface of the cable A is simultaneously inserted. The inner peripheral surface of the conductor D is inserted along the outer peripheral surface of the cylindrical portion 27a of the reinforcing sleeve 27, and the tip of the outer conductor D is inserted into the reinforcing sleeve 27.
Insert until it abuts against the thick flange 27b.
Then, when the tightening fitting 11 is screwed into the threaded portion 1a on the outer circumferential surface of one end of the connector body 1, the tip of the tapered clamp 21 loaded in the tightening fitting 11 is attached to the back-up ring 20 inside the connector body 1. It hits the claw body 22 and moves the backup spring 20 along the axial direction. As the back-up spring 20 moves, the second insulator 8 fitted to the back-up ring also moves along the axial direction, and during this movement, the tapered surface 8b of the second insulator 8
contacts the tapered surface 7c formed on the outer peripheral surface of the end of the conductor receiving portion 7b of the center contact 7, narrowing the conductor receiving portion 7b, and as a result, the internal conductor B of the cable A is held against the conductor receiving portion 7b of the center contact 7. It is fixed by pressure welding. The outer conductor D at the tip of the cable A is also fixed by pressure contact between the cylindrical portion 27a of the reinforcing sleeve 27 and the split taper clamp 29 loosely fitted into the clamping fitting 11 due to the narrowing of the split taper clamp 29. be done. When the tightening fitting 11 is tightened more strongly, the clamp 2 comes into sliding contact with the tapered surface 29a on the outer peripheral surface of one end of the split taper clamp 29.
8 compresses the annular elastic member 23 from the side, causing the elastic member 23 to expand toward the center in the radial direction and bring the outer conductor D of the cable A into tight elastic contact.

<Embodiment> FIG. 1a shows an embodiment of the first invention, in which 1 denotes an O-ring 2 for sealing the base of the threaded portion 1b on the side of the connector main body which is screwed into the connector K of the device.
Further, an O-ring 12 for sealing the metal fitting 11 and the main body 1 is provided at the base of a screw portion 1a which is screwed into a tightening metal fitting 11 to be described later. A columnar first insulator 3 having an insertion hole 3a for a center contact 7 is loaded at the tip end inside the connector body 1. As shown in FIG. A portion of the pin portion 7a of the center contact 7 protrudes from the connector body 1, and a portion of the pin portion 7a of the center contact 7 protrudes from the connector body 1.
The conductor receiving portion 7b has a concave and convex portion 7d formed on its inner circumferential surface such that it can be narrowed, and a tapered surface 7c is formed on the outer circumferential surface of the terminal end portion of the conductor receiving portion 7b. The second insulator 8 is loaded approximately in the middle of the connector body 1, and has a conductor insertion hole 8a in its center.
and a tapered surface 8b on the distal end side of the insertion hole 8a.
is formed so as to be in sliding contact with the tapered surface 7c of the conductor receiving portion 7b. Further, a part of the outer circumferential surface of the second insulator 8 is fitted into the back-up spring 20, so that it can be moved back and forth along the axial direction. The taper clamp 21 is formed of a thin-walled cylindrical portion 21a having an inner diameter large enough to allow the insulator C of the cable A to be inserted therethrough.
Its outer circumferential surface is a slightly tapered surface 21c, and the outer circumferential surface of a thick flange 21b formed at the tip of the cylindrical portion 21a is press-fitted and fixed to an intermediate portion of the inner circumferential wall of the connector body 1.

The tip end surface of the thick flange 21b is close to the backup spring 20. Backup spring 2 adjacent to thick flange 21b
0 has a notch 21 of the thick flange 21b.
A claw body 22 is integrally formed through the flange 21b and protrudes from the flange 21b (see FIG. 5). The fastening fitting 11 has a cylindrical shape with a polygonal side surface having a fastening portion 11a on its outer surface, and has a threaded portion 11b screwed into the threaded portion 1a of the connector body 1 formed at one end of its inner circumferential surface. ing. The other end of the fastening fitting 11 has a cable insertion hole 11c, and an annular elastic member 23 such as a gasket is housed in a position adjacent to the cable insertion hole 11c via a stepped portion 11d. At a position adjacent to 23, a washer 25 with a spring 24 is loaded into a hole 11e having a larger diameter than the storage portion of the elastic member. The large diameter hole 11e is provided with a fastening fitting 1 in contact with a washer 25 with a spring 24.
A locking flange 26a formed on the outer circumferential surface of the end of the split clamp 26 loosely inserted into the clamp 1 is fitted. The split clamp 26 is a cylindrical body with a diameter that can press the cable A during stenosis, and its inner circumferential surface is slightly tapered to match the tapered surface 21c of the taper clamp 21, and has a cable pressure welding plate on the inner circumferential surface. A crow screw 26b is carved (see Fig. 6). By providing the glass screws 26b in this way, the jacket E of the cable A can be prevented from coming off. Further, the tip of the split clamp 26 comes into contact with the claw body 22 when the fastening fitting 11 is screwed into the connector body 1.

FIG. 1b and FIG. 2b show an embodiment of the second invention, and since they are basically the same as FIGS. 1a and 2a, only the main differences will be explained. In place of the taper clamp 21, a reinforcing sleeve 27 is provided which has a relatively thick cylindrical portion 27a that protrudes outward from the connector body 1, and furthermore, a reinforcing sleeve 27 is provided inside the fastening fitting 11 on the radial outer side of the reinforcing sleeve 27. A split taper clamp 29 is provided which is loosely fitted and has an inner circumferential surface with the same diameter and a screw 29c carved therein, and a tapered surface 29a on the outer circumferential surface of one end of the split taper clamp 29 has the same diameter as the tightening metal fitting 11. Cable insertion hole 11 inside
It abuts against the tapered surface 28a of the clamp 28 and an annular elastic member 23 such as an O-ring, which is housed in the hole 11f through the c-side proximal step 11d in order from the left in abutting manner. Reinforcement sleeve 27
The gap between the split taper clamp 29 and the split taper clamp 29 is such that only the outer conductor D of the cable A can be inserted therethrough. Further, the tapered surface 29b of the outer peripheral surface near the other end of the split taper clamp 29 is in sliding contact with the tapered surface 1c of the inner surface of the rear end of the connector body 1, and the other end of the split taper clamp 29 is in contact with the claw body 22. That's what I do.

<Effects of the Invention> As can be seen from the above description, the present invention can be achieved by inserting the inner conductor of the terminal-treated cable into the center contact of the connector body and then tightening it toward the connector body while turning the tightening fitting. The tip of the split clamp according to the second invention or the split taper clamp according to the second invention pushes the claw body to move the back-up spring along the axial direction, and the second insulator also moves along the axial direction accordingly. Then, the tapered surface formed on the second insulator slides into contact with the tapered surface of the outer peripheral surface of the end of the conductor receiving portion of the center contact, narrowing the conductor receiving portion, and crimping the inner conductor at the tip of the cable as in the conventional method. It is possible to firmly press and fix the parts without using any jigs or the like. Furthermore, at the same time as the internal conductor is fixed by pressure welding, the outer sheath or the external conductor at the tip of the cable is also tightened and fixed at once with uniform strength using the split clamp according to the first invention or the split taper clamp according to the second invention. It has an unprecedented effect. In particular, when the outer conductor of the cable is soft, such as aluminum laminate, as in the case of the first invention, even if the outer sheath shrinks during the cold winter months after being connected to the connector, the split clamp will always use a spring-loaded washer. Since the cable is compressed by the cable, the split clamp also narrows according to the shrinkage margin, so that the insulator and sheath of the cable can always be fixed by pressure contact, and problems such as connection failures do not occur.

Furthermore, even if the outer conductor of the cable is soft, embrittlement or cracking does not occur at the peeled base of the outer conductor, and the outer surface of the cable is not extremely compressed compared to the outer surface of the nearby cable. It is convenient that the connection work can be completed by simply tightening both the connector main body and the fastening fitting, in which the necessary parts are stored in advance, without damaging the electrical characteristics.

[Brief explanation of drawings]

FIG. 1a is a sectional view showing an embodiment of the first invention;
Figure 1b is a sectional view showing an embodiment of the second invention, Figure 2a is a side view of Figure 1a, and Figure 2b is Figure 1b.
3a is a sectional view showing the cable connection state of the first invention, FIG. 3b is a sectional view showing the cable connection state of the second invention, and FIG. 4a is a sectional view of the cable according to the first invention. FIG. 4b is a cross-sectional view of the end treatment of the cable according to the second invention, and FIG. 5 is a partially cutaway perspective view showing the relationship between the taper clamp, the back-up ring, and the second insulator according to the first invention. figure,
FIG. 6 is an enlarged cross-sectional view of the interrupting clamp according to the first invention, FIG. 7 is a cross-sectional view of the conventional example, and FIG.
FIG. 9 is a side view of the figure, FIG. 9 is a cross-sectional view of cable terminal processing, and FIG. 10 is a cross-sectional view showing a conventional cable connection state. DESCRIPTION OF SYMBOLS 1... Connector main body, 1c... Tapered surface, 7... Center contact, 7b... Conductor receiving part, 7c... Tapered surface, 8... Second insulator, 8b... Tapered surface, 11... Tightening metal fitting, 11d... Step part, 11e , 11f...hole part,
20...Backup spring, 21...Taper clamp, 21a...Slightly tapered thin-walled cylindrical portion on the outer circumferential surface, 2
1b...thick wall flange, 21c...tapered surface, 21e
... Crow screw, 22 ... Claw body, 23 ... Annular elastic member, 24 ... Spring, 25 ... Washer, 26 ... Split clamp, 27 ... Reinforcement sleeve, 27a ... Cylindrical part partially protruding from the connector body, 27b …
Thick wall flange, 28...clamp, 28a...tapered surface, 29...split taper clamp, 29a, 29
b...Tapered surface, A...Cable, B...Inner conductor, D
...Outer conductor, E...Outer sheath.

Claims (1)

[Scope of Claims] 1. The outer circumferential surface of the conductor receiving portion of the center contact is held such that a portion of the pin portion protrudes to the outside by the first insulator fitted to the tip portion within the connector body. A second insulator that forms a surface and can slide on the tapered surface to narrow the conductor receiving portion is disposed within the connector body, and a back-up ring fitted with the second insulator is attached to the inner circumferential wall of the connector body. The thick-walled flange of a taper clamp consisting of a thick-walled flange and a tapered thin-walled cylindrical portion with a slightly tapered outer peripheral surface close to the back-up spring is press-fitted into the inner wall of the connector body, and the thick-walled flange is A claw body that penetrates and protrudes from the thick flange is provided on one side of the back-up spring, and the cable is attached to the inner circumferential wall on the cable insertion side of the tightening fitting that is threadedly engaged with the threaded portion on the outer circumferential surface of one end of the connector body. An annular elastic member capable of compressing the outer cover and a spring-loaded washer are each loaded in abutting manner, one end of which abuts the spring-loaded washer, and the other end abuts the claw body;
An FT type connector in which a split clamp is loosely fitted into the tightening fitting so as to be positioned radially outward of the taper clamp. 2 Forming a tapered surface on the outer peripheral surface of the end of the conductor receiving part of the center contact, which is held by the first insulator fitted to the tip part in the connector main body so that a part of the pin part protrudes to the outside. A second insulator capable of slidingly contacting the tapered surface and constricting the conductor receiving portion is disposed within the connector body, and a back-up ring fitted with the second insulator is provided along the inner peripheral wall of the connector body, The thick-walled flange of a reinforcing sleeve consisting of a thick-walled flange and a cylindrical portion partially protruding from the connector body is press-fitted into the inner wall of the connector body near one side of the back-up spring, and the thick-walled flange is penetrated. A claw protruding from the thick flange is provided on one side of the back-up spring, and the outer conductor of the cable is provided on the inner circumferential wall on the cable insertion side of the fastening fitting that is threadedly engaged with the threaded portion on the outer circumferential surface of one end of the connector body. An annular elastic member and a clamp capable of compressing are loaded in contact with each other, and the tapered surface of the outer circumferential surface of one end is in sliding contact with the tapered surface of the inner circumferential surface of one side of the clamp, and the tapered surface of the outer circumferential surface of the other end A split taper clamp is arranged concentrically on the outside of the reinforcing sleeve so that the tapered surface slides on the tapered surface on the inner surface of the rear end of the connector body, and the other end comes into contact with the claw body. FT type connector that is fitted in a mating manner.