JPH0452946Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is based on JIS-C-5410 (General rules for high frequency coaxial connectors) and has a nominal impedance of 75Q for use in outdoor facilities for television joint reception and two-way urban CATV. , Voltage 350V (effective value) Frequency 250M
Concerning FT type connectors with two series designed for ratings below Hz or below 1000MHz.

[Prior Art] For example, as shown in FIG. 7, a conventional FT type connector has a first insulator 2 fitted to the tip inside the connector body 1 so that a part of the pin part 3a protrudes outside. A tapered surface 3c is formed on the outer peripheral surface of the end of the conductor receiving portion 3b of the held center contact 3.
A second insulator 4 that can slide on the tapered surface 3c and narrow the conductor receiving portion 3b is disposed within the connector body 1. A back-up spring 6 fitted with a second insulator 4 is provided along the inner circumferential wall of the connector body 1, and a bushing 9 that abuts one side of the back-up spring 6 is press-fitted into the connector body 1. The outer peripheral surface of the thick-walled flange 10b of the sleeve 10, which is composed of a thin-walled cylindrical portion 10a and a thick-walled flange 10b, fits into the inner peripheral surface of the bushing 9. A claw body 7 integrally formed to protrude from one side of the back-up spring 6 along the axial direction forms a groove 9 on the outer peripheral surface of the bushing 9.
A clamp 11 having a tapered surface 11a on the inner circumferential surface passing through the connector body 1 is loosely fitted into the inner circumferential surface of the connector body 1 near the rear end. An axial guide protrusion 12a is provided on the outer circumferential surface of the clamp 11 and the inner circumferential surface of the connector body 1, and a guide that fits into the guide protrusion 12a so that the clamp 11 can move along the axial direction inside the connector body 1. Grooves 12b are respectively formed. An annular elastic member 8 capable of compressing the outer sheath E of the cable A, a washer 13, and a split clamp are installed inside the cable insertion side of the clamping fitting 5 that screws with the threaded portion 1a on the outer circumferential surface of one end of the connector body 1. The fourteen flange portions 14b are loaded so as to be in contact with each other via the retaining ring 15 for preventing slippage. Further, the distal end of the insertion clamp 14 is placed in contact with the tapered surface 11a of the clamp 11, and an uneven strip 14a is formed on the inner peripheral surface of the insertion clamp 14 along the axial direction.

[Problems to be solved by the invention] The conventional FT type connector mentioned above has a connector body 1
and a cylindrical fastening fitting 5 that is screwed into the connector main body 1, and several types of parts are housed within the connector. Since such connectors contain a large number of parts, there are problems such as problems due to contact between dissimilar metals, contact resistance and potential difference at the contact area, and stable electrical characteristics cannot be obtained at the contact area. Ta. Furthermore, as a result of the rapid weakening of the pressure contact force applied by the second insulator 4 to the conductor receiving portion 3b of the center contact 3, there is a problem in that the internal conductor at the tip of the cable is not securely fixed in the conductor receiving portion 3b of the center contact 3. Ta.

In addition, when tightening the cable sheath with the split clamp 14, an unreasonable load is placed on the threaded part between the connector body 1 and the clamping fitting 5, and when the cable is repaired, the FT
There were drawbacks such as the inability to reuse the type connector.

The present invention was developed in view of the above points, and its purpose is to prevent defects, contact resistance, and potential differences that conventionally occur at the contact points between assembled components by integrating the connector body and the sleeve. In order to provide a connector that eliminates the problem and obtain stable electrical characteristics, and to strengthen the connection between the coaxial cable and the connector, the conductor receiving part of the center contact into which the coaxial cable is inserted is inserted from two directions facing each other. To provide an FT type connector which is fixed by being strongly pressed, whose outer sheath is firmly held by a split type fastening fitting, and which can be used repeatedly.

[Means for Solving the Problems] The FT type connector according to the present invention includes a center contact in which a part of the pin part is held by a first insulator fitted to the tip part in the connector body so as to protrude to the outside. has a structure in which the conductor receiving portion having uneven stripes on the inner circumferential surface can be narrowed, through-holes are bored at two opposing locations in the body of the connector body, and the conductor receiving portion is narrowed through the through-holes. the second insulator is attached to the rear end of the connector body,
A sleeve is integrally formed at the rear end of the connector body, and the connector body and the insulating object are respectively press-fitted, and the cable jacket is bitten into the cable insertion hole and is press-fitted with concave and convex portions. It is equipped with a split fastening fitting.

[Function] The coaxial cable is terminally treated in advance. Insert the inner conductor of the cable into the conductor receptacle of the center contact mounted inside the connector body. At the same time as this insertion, a sleeve integrally formed at the rear end of the connector body is inserted between the cable insulator and the outer conductor. With the internal conductor fully inserted into the conductor receiving portion, insulating objects are loaded through two through-holes formed at opposing positions in the body of the connector body. After loading, place the two halves of the fastening metal fittings from above and below (sometimes from the left and right positions) so as to cover the body of the connector body and the cable jacket, respectively, and tighten both fastening metal fittings with screws. to complete the connection process.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

Reference numeral 20 denotes a connector main body, and the outer circumferential surface thereof has a threaded portion 2 at its tip for connecting to a device connector (not shown).
0a and an O-ring 20b for sealing, a nut portion 20c and an outer circumferential groove 20d are successively formed adjacent to each other, and a body portion 21 of the same thickness is formed on the rear side, and an end surface of the body portion 21 is formed. A sleeve 22 to be inserted between the insulator C and the outer conductor D of the coaxial cable A is integrally formed to protrude. The sleeve 22 has a tapered outer circumferential surface 22a at its tip so that it can be easily inserted. The reason why the connector main body 20 and the sleeve 22 are integrated in this way is to eliminate the problems, contact resistance, and potential differences that occur at the contact points between conventional assembled parts, and to achieve stable electricity using the same metal member. This is to enable the characteristics to be obtained.

Reference numeral 23 denotes through holes bored at two opposing locations in the body 21 of the connector main body 20, through which an insulating object 24 for constricting a conductor receiving portion 25a, which will be described later, is loaded. The insulating body 24 has an outer shape that follows the inner circumferential surface of the through hole 23 , the inner part that contacts the conductor receiving part 25 a forms a curved recess 24 a, and the outer part that contacts the conductor receiving part 25 a forms a curved recess 24 a. The curved surface 24b has a matching shape. Also, the insulating object 24
is an insulating object made of resin such as fluororesin such as polyphenylene oxide (trade name: Noryl modified resin (manufactured by Engineering Plastics Co., Ltd.)) or polytetrafluoroethylene (trade name: Teflon (manufactured by Mitsui Fluorochemical Co., Ltd.)). A single structure 24c (in the case of Noryl modified resin) (see Figure 1) or a laminate structure 24d (in the case of Teflon resin) (see Figure 5a), or a resin insulating object (Teflon resin) 24e inside.
The structure is such that a metal object 26 such as brass is laminated on the outside (see FIG. 5b). At this time, the outer diameter of the body portion 21 and the thickness of the insulating body 24 are determined in consideration of electrical characteristics and the like. Further, a columnar first insulator 27 having an insertion hole 27e for the center contact 25 is loaded at the tip inside the connector main body 20. Pin portion 25 of center contact 25
A part of a protrudes from the connector main body 20, and the conductor receiving part 25b is cut into a space that can be constricted, and an uneven strip 25c, such as a screw, is formed on the inner circumferential surface of the conductor receiving part 25b. form an annular collar 25d for positioning the insulating object 24, respectively. Furthermore, an insertion hole 28 for the internal conductor B of the coaxial cable A is located near the rear end inside the connector body 20.
A second insulator 28 having a diameter is attached.

29 has an annular flange 29a extending inwardly at one end that fits into the outer peripheral groove 20d of the connector body 20, and has a large diameter annular flange 29b inside which presses the body 21 and the insulating object 24, respectively. It is a two-piece fastening fitting having an uneven portion 29d on the inner circumferential surface of an insertion hole 29c for tightening the outer sheath E of the coaxial cable A. The two halves of the fastening fitting 29 are usually connected by a ring 30 or the like so that they do not fall apart. In addition, the two-split tightening fitting 29a has a sealing material 3 made of an elastic material at a predetermined position in order to create a watertight structure when tightening.
1 is attached (see Figures 4a and b). Furthermore, screw holes 32 and screw rods 33 for sandwiching and tightening the connector main body 20 are respectively attached to the two-split fastening fitting 29a from the top and bottom, or from the left and right sides.

Next, how to use the above embodiment will be explained.

Coaxial cable A is terminal-treated in advance (6th
(see figure a). And this terminal treated cable A
Insert the internal conductor B into the conductor receiving portion 25b of the center contact 25 mounted inside the connector body 20. At the same time as this insertion, insert the sleeve 22 integrally formed at the rear end of the connector body 20 into the cable A.
between the insulator C and the outer conductor D (6th
(see figure b). When the internal conductor B of the coaxial cable A is fully inserted into the conductor receiving part 25b of the center contact 25, the body 21 of the connector body 20
The insulating objects 24 are respectively loaded through the two through-holes 23 formed at opposing positions (see FIG. 6b).
After loading the insulating object 24, the two-piece tightening fitting 29
Apply it from above and below (sometimes from the left and right positions) so as to cover the body 21 of the connector main body 20 and the cable jacket E, respectively, screw the threaded rod 33 into the threaded hole 32, and split it into two. When both fastening metal fittings 29 are firmly tightened, the joint surfaces of both fastening metal fittings 29 and the outer sheath E of cable A each form a watertight structure, completing the connection work.

[Effects of the invention] As can be seen from the above explanation, the present invention eliminates the problems, contact resistance, and potential differences that conventionally occurred at the contact area between assembled parts by integrating the connector body and the sleeve, and the same Because it is integrally formed from a metal material, it has the excellent effect of providing stable electrical characteristics.

In addition, with the inner conductor of the coaxial cable inserted into the conductor receiving part of the center contact, firmly press the outside of the conductor receiving part with the upper and lower insulating objects and the two-split fastening fitting, and securely hold the outer sheath of the coaxial cable. The cable insertion holes formed in each of the two halves of the fastening fittings have an uneven part that bites into the cable insertion hole to securely fix the cable, which can cause problems such as the cable coming loose during use. is completely resolved.

Furthermore, when connecting the connector to the coaxial cable, it is only necessary to insert the sleeve integrally formed at one end of the connector body directly between the cable insulator and the external conductor, making the connection work even easier.

Furthermore, since the number of parts to be assembled into the connector is small, it can be manufactured economically and at low cost.

Moreover, since the clamping fitting is divided into two parts, it is easy to remove the connector from the cable, making it possible to use it repeatedly, and it is completely waterproof and dustproof as before.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
4A and 4B are plan views showing the inside of the two-piece fastening fitting. FIGS. 5A and 5B are sectional views showing the laminated structure of the insulating material. FIG. 6 A to C are cross-sectional views showing a method of connecting a connector and a cable, and FIG. 7 is a cross-sectional view showing a conventional example. 20...Connector body, 21...Body part, 22...
...Sleeve, 23...Through hole, 24...Insulating object,
25...Center contact, 25a...Pin part, 2
5b... Conductor receiving portion, 25c... Uneven strip, 27...
...first insulator, 28...second insulator, 29...2
Split clamping bracket, A... Coaxial cable, B...
Inner conductor, C...Insulator, D...Outer conductor, E...
...Outer covering.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The center contact, which is held by the first insulator fitted to the tip inside the connector body so that a part of the pin part protrudes outside, has an uneven strip on the inner peripheral surface. a conductor receiving part having a structure capable of being constricted, through-holes being bored at two opposing locations in the body of the connector body, and an insulating object that constricting the conductor receiving part being loaded through the through-holes; A second insulator is attached to the rear end of the connector body, a sleeve is integrally formed at the rear end of the connector body, the connector body and the insulating object are respectively pressed, and the cable is inserted into the cable insertion hole. An FT type connector characterized by having a two-piece clamping fitting with a concave and convex part that presses the cover in a biting manner. (2) The insulating object that constricts the conductor receiving part shall be a single or laminated structure of a resin insulating object such as polyphenylene oxide or fluorine resin such as polytetrafluoroethylene, or a resin insulating object inside. 1. The FT type connector according to claim 1, which is characterized by having a structure in which a metal object is laminated on the outside.