JP2001185285A - Set screw with cable connector and seal ring - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a connector for a cable such as an optical cable with improved waterproofness. The present invention relates to a tubular back shell (2).
The tension member stopper 220 is fitted into the cylinder 10 and fixed, while the tension member stopper 22 is fitted.
The tension member C1 of the cable C inserted into one cylinder of the back shell 210 is mounted on the tension member mounting portion 221 of the back shell 210, and the core C2 of the cable C is inserted into the core insertion portion of the tension member stopper 220. In a cable connector that is inserted and guided to the other side of the back shell 220, the back shell 210
The mounting holes 211 and 224 are provided so as to hang over the fixing portion 223 of the tension member stopper 220 that is inscribed in the outer periphery of the cylinder and the inside thereof, and the mounting holes 211 and 224 are provided with set screws 300 with a seal ring. In the cable connector to be attached and to fix the tension member stopper 220, good waterproofness can be obtained simply and easily by screwing the set screw 300 with the seal ring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for a cable such as an optical cable having a tension member, and a set screw having a seal ring useful for the connector.

[0002]

2. Description of the Related Art In recent years, in various types of electric equipment, an optical cable (including a single core wire or a unitized core wire) having a built-in optical fiber core (including a single core or unitized core) in addition to a metal wire cable as a signal transmission means or the like.・ Electric composite cables etc. are also used.

[0003] In the case of this optical fiber core wire, not only the tensile force in the longitudinal direction is weak due to the characteristics of the material made of quartz glass material or plastic material, but when the tension is applied, the transmission characteristics are greatly affected. To become
Usually, a wire made of a steel wire called a tension member or a high-strength plastic fiber wire is inserted into a central portion of the cable or the like.

In using such an optical cable,
When connecting to a cable or other electric equipment, a cable connector is used. As a conventional connector of this type, for example, there is one shown in FIG.

[0005] The connector 100 shows a receptacle side for receiving a plug-shaped ferrule of a mating connector.
The rough configuration thereof is as follows. A back shell 110 formed of a tubular long body, a tension member stopper 120 inserted and fixed in the cylinder of the back shell 110, and an opening on one side (front end side) of the back shell 110 A bent shell 130 which is fixed to the side and has an L-shape as a whole, a columnar front insert 150A mounted on a free end side of the bent shell 130 via a cylindrical joint shell 140, and a connection side insert ( Receptacle insert) 150B and cylindrical guide shell (plug shell) 160, cylindrical fixing coupling 170 mounted on the outer periphery of guide shell 160, and the other (rear end side) cylinder of back shell 110 A cylindrical elastic bushing 180 fitted into the outer periphery of the cable C inserted in the back shell 11;
0 and a cap-shaped cable clamp 190 rotatably mounted on the other outer periphery of the cable clamp 190.

The tension member C1 inside the cable C is inserted into a tension member mounting portion 121 formed of a cylinder of the tension member stopper 120, and is inserted in a radial direction (width direction) of the cylindrical member. Set screw 1 screwed into female screw hole 121a provided in
22. The tension member stopper 120 itself is attached to a disk-shaped fixing portion 123 provided at the front end (left side in FIG. 8) of the cylindrical body.
It is fixed by a set screw 112 screwed into a mounting hole (screw hole) 111 on the 10 side.

On the other hand, for example, two optical fiber core wires C2 exiting from the cable C are fitted into a cylindrical core wire receiver 151 arranged in the front insert 150A at the leading end thereof. The ferrule 152 attached to the connection side insert 150
B is elastically occupied in the middle of the cylindrical ferrule receiver 153 arranged in B, and the tip of the plug-shaped ferrule connected to the optical fiber core wire of the mating connector (not shown) is inserted and abutted. It has become. The connector structure on the plug side may be various structures depending on the application, but may be the same type as the connector 100 on the receptacle side.

When connecting the plug-side connector 100 to the mating receptacle-side connector, the guide shell 160 is fitted to the mating receptacle shell, and the cap-shaped coupling 170 is rotated. Then, the two are connected.

[0009]

However, in the case of such a conventional connector 100, there is room for improvement as follows.

First, since the connector 100 having this structure is generally required to be waterproof, a fixing screw 112 is screwed into a mounting hole 111 of the back shell 110 when the tension member fixing member 120 is fixed. Apply adhesive to the part or set screw 1 from the beginning.
By screwing on 12 with the adhesive applied,
Although waterproofing is attempted, there have been problems that sufficient waterproofing is not obtained and that the operation is troublesome.

Next, the bent shell 1 of the guide shell 160
For fixing to the 30 side, the joint shell 140 is screwed around the outer periphery of the guide shell 160, and a part thereof is set with the set screw 1
41, the joint shell 140 and the bent shell 13
Although an E-ring (retainer ring) 142 is interposed between the joint shell 140 and the joint shell 140, there are problems such as looseness and looseness of the joint shell 140 during use.

This is because the front insert 150
A, connection side insert 150B and guide shell 160
However, since the direction is substantially orthogonal to the straight back shell 110, the impact when an external force is applied tends to be larger than the initially expected value. It is thought to be due to inadequate results.

When assembling the connection insert 150B to the front insert 150A, a plurality of ferrule receivers 153 of the connection insert 150B are fitted to the plurality of ferrules 152 protruding from the front insert 150A. At this time, it is necessary to pay close attention in order to prevent the tip of the ferrule 152 from being shocked or scratched, which is rather troublesome. Was.

[0014] The present invention has been made in view of such conventional problems, and aims at improving the waterproofness of a fixing portion of a tension member stopper, and increasing the fixing strength between a bent shell and a joint shell. On the other hand, an object of the present invention is to provide an excellent cable connector capable of easily and quickly assembling a connection-side insert, and a useful set screw with a seal ring used for the connector.

[0015]

According to a first aspect of the present invention, a tension member stopper is fitted and fixed in a cylinder of a cylindrical back shell, while a tension member mounting part of the tension member stopper is provided in a tension member mounting portion. A tension member of the cable inserted into one cylinder of the back shell is mounted, and a core wire of the cable is inserted into a core wire insertion portion of the tension member stopper, and is guided to the other side of the back shell. In the above-described cable connector, mounting holes are provided which are respectively connected to the outer peripheral portion of the back shell and a fixing portion of the tension member stopper fitting inscribed in the cylinder of the back shell, and the mounting holes are sealed. Fixing the tension member stopper by attaching a set screw with a ring In the cable connector for the butterflies.

According to a second aspect of the present invention, a cylindrical, generally L-shaped bent shell is fixed to the other side of the back shell, and a cylindrical joint shell is formed at the open end of the bent shell. A columnar front insert, a connection side insert, and a cylindrical guide shell are mounted via the base member, and the core wire of the cable inserted into the core wire insertion portion of the tension member stopper is guided to the front insert portion. The cable connector according to claim 1, wherein

According to a third aspect of the present invention, the joint shell is fixed to the outer periphery of the bent shell by an E-ring, and a set screw is screwed into a female screw hole provided in a part of the outer periphery of the joint shell. 3. The cable connector according to claim 1, wherein the cable connector is double-fixed.

According to a fourth aspect of the present invention, a positioning means is provided at a distal end side of the bent shell between a front insert incorporated in a guide shell connected by the joint shell and a connection side insert. Item 1,
The cable connector according to 2 or 3.

According to a fifth aspect of the present invention, a ring stopper is provided at an intermediate portion of the screw shaft slightly separated from the screw head, and an annular seal ring is mounted between the ring stopper and the screw head. A set screw with a seal ring.

[0020]

1 to 3 show an example of a cable connector according to the present invention. In this case as well, a connector on the plug side is illustrated similarly to the connector 100 of FIG.

The general configuration of the connector 200 is as follows.
A back shell 210 formed of a cylindrical long body, a tension member stopper 220 inserted and fixed in the back shell 210, and a tube fixed to one (front end) opening side of the back shell 210. A bent shell 230 having a L-shape as a whole, a column-shaped front insert 250A, a connection-side insert (receptacle insert) 250B, and a tube mounted on the free end side of the bent shell 230 via a cylindrical joint shell 240. A mold-type guide shell (plug shell) 260, a cylindrical fixing coupling 270 mounted on the outer periphery of the guide shell 260,
A cylindrical elastic bushing 280 fitted on the outer periphery of the cable C inserted into the other (rear end side) tube of the back shell 210, and a cap-shaped rotatably mounted on the other outer periphery of the back shell 210. Cable clamp 290
Consists of

The tension member C1 inside the cable C, which is exposed, is inserted into the cylinder of the tension member mounting portion 221 composed of the cylinder of the tension member stopper 220, and as shown in FIG. It is fixed by a set screw 222 screwed into a female screw hole 221a provided in the radial direction (width direction) of the body.

On the other hand, this tension member stopper 2
20 itself has a mounting hole (screw hole) 224 in a disk-shaped fixing portion 223 provided at the front end (left side in FIG. 1) of the cylindrical body. A set screw 300 with a seal ring inserted into the (through hole) 211 is screwed and fixed.

Set screw 300 with this seal ring
As shown in FIG. 6, a ring formed of a flange-shaped enlarged portion (simply a plurality of protrusions or a separate washer-like member is also possible) in the middle of the screw shaft 320 slightly separated from the screw head 310. A stopper 330 is provided, and a screw head 3
An annular seal ring made of a rubber material or the like between 10 (O
Ring 340 is attached. In addition, the seal ring 3
The outer diameter of the mounting hole 40 is the mounting hole 2 on the back shell 210 side.
11 is set slightly larger than the diameter,
The diameter may be slightly increased by utilizing rubber elasticity, and the screw head 310 or the ring stopper 330 may be passed over.

Therefore, the set screw 300 is inserted into the mounting hole 211 on the back shell 210 side, and the male screw portion 321 is screwed into the female screw portion provided in the mounting hole 224 of the fixing portion 223 of the tension member fixing member 220. The seal ring 340 is press-fitted into the mounting hole 211 on the back shell 210 side only by being attached, so that the sealing property is easily ensured. That is, good waterproofness is obtained. Of course, there is no need to apply an adhesive as in the related art.

Here, the mounting hole 211 on the back shell 210 side for receiving the set screw 300 having such a function.
As shown in an imaginary line in FIG. 6, a large diameter portion 211a is formed on the outer side, and the screw head 310 of the set screw 300, the seal ring 340, and the ring stopper are formed in this portion. While the portion 330 is housed, a portion penetrating to the inner wall side is a small-diameter portion 211b having an inner diameter through which the screw shaft 320 of the set screw 300 passes. In addition, if the female screw portion is provided in the small diameter portion 211b of the mounting hole 211,
It is also fixed by screwing with this part. In this case, the fixing portion 223 of the tension member stopper 220
It is also possible to make the mounting hole 224 simply a blind hole without a female screw portion. Of course, both mounting holes 211, 224
It is also possible to form a female screw portion on the base.

At the rear end side of the back shell 210, waterproofing is achieved by crimping the enlarged diameter crimping portion 281 of the elastic bushing 280, and at the front end side, the bent shell is provided. Waterproofness is achieved by interposing a seal ring 400 such as an O-ring at a connection portion with the joint 230 and a connection portion between the bent shell 230 and the joint shell 240.

On the other hand, as shown in FIG. 5, the core wire C2 of, for example, two optical fibers output from the cable C is connected to the disk-shaped fixing portion 22 of the tension member stopper 220.
3, through the core wire insertion portions 225 and 225 formed of, for example, two notched grooves, the leading end thereof is guided toward the front insert 250A. The ferrule 252 fitted into the cylindrical core receiver 251 arranged in the front insert 250A and attached to the tip of the core receiver 251 is connected to the connection side insert 2.
50B inside the cylindrical ferrule receiver 253
Elastically be Uranaii in developing, the tip of the connected plug-like ferrule of the optical fiber core wire of mating connector (not shown) is inserted, is adapted to be abutted.

The bent shell 2 of the guide shell 260
For fixing to the side of the guide shell 30, the joint shell 240 is screwed around the outer periphery of the guide shell 260 and a part thereof is set with a set screw 2.
41, while the joint shell 24 as shown in FIG.
0 and the bent shell 230 with an E-ring (retainer ring) 242 interposed therebetween, and the joint shell 240
A female screw hole 243 is provided in a part of the outer circumference of the shell, and a set screw 244 is screwed into the female screw hole 243, and the tip is pressed against the outer circumference of the bent shell 230 to be fixed in two layers.

Thus, the connection strength between the bent shell 230 and the joint shell 240 is increased. As a result, irrespective of the shape of the bent shell 230 bent in the L-shape, a fear that the joint shell 240 is loose or loose during use is effectively prevented. When the set screw 244 is screwed, the set screw 24 is also provided on the outer peripheral side of the bent shell 230.
If the female screw hole 231 to which the screw 4 is screwed is provided, a further strong connection is possible. Of course, the set screw 24
It is also possible to screw 4 at a plurality of places, whereby the connection strength can be further increased. The number of set screws 241 on the guide shell 260 side can be increased to a plurality.

As shown in FIGS. 3 and 4, a positioning means 500 is provided between the front insert 250A and the connecting insert 250B incorporated in the guide shell 260. That is, more specifically, for example, 2
Book guide pins 510, 510 and front insert 250A corresponding to these guide pins 510, 510.
Guide holes 520, 5 formed on the outside (left side in FIG. 4)
20 constitutes a positioning means 500. Note that the relationship between the pin and the hole can be reversed.

Therefore, the front insert 250A
When assembling the connection side insert 250B to the side, the guide pin 5 of the connection side insert 250B side protruding long.
If the 10, 510 is aligned and inserted into the guide holes 520, 520 on the front insert 250A side, the guide pins 510, 510 guide the connection side insert 250B side to move, so that the front insert 250A side protrudes. It is possible to automatically guide the plurality of ferrules 252 into the ferrule receiver 253 on the connection side insert 250B side without applying unnecessary impacts, scratches, or the like to the distal ends of the plurality of ferrules 252.

For this reason, during this operation, even if the user does not pay much attention, the operation is performed in such a manner that the end surface of the ferrule 252, whose end surface of the optical fiber core wire is polished and cut, is protected. It is possible to do. In other words, quick work is possible without requiring much skill.

In the above-described embodiment, the receptacle-side connector has a structure for receiving the ferrule of the mating connector having a protruding shape in the form of a plug.
Of course, the present invention can also be applied to a plug-side connector having the same structure (a connector having a ferrule shaped like a plug).

[0035]

(1) First, according to the cable connector according to the first aspect of the present invention, a set screw with a seal ring is used to fix the tension member fixing member in the cylinder of the back shell. By simply screwing the set screw with the seal ring into a predetermined screw hole, good waterproofness can be obtained easily and easily. (2) Next, according to the cable connector according to the second aspect of the present invention, since the cylindrical, generally L-shaped bent shell is fixed to the other side of the back shell, the direction of the cable core wire is changed. It is possible to easily change the direction of bending at a substantially right angle and obtain good waterproofness. (3) Further, according to the cable connector according to the third aspect of the present invention, the joint shell can be fixed to the bent shell twice by the E-ring and the set screw.
A large connection strength is obtained, and it is possible to effectively prevent the joint shell from rattling or loosening during use.
Good waterproofness and easy direction change of the cable core are also obtained. (4) Further, since the positioning means is provided between the front insert incorporated in the guide shell and the connection-side insert, a great deal of skill is not required, and a quick operation in a form in which the tip end side of the ferrule is protected. Becomes possible. (5) According to the set screw with the seal ring according to the fifth aspect of the present invention, the screw is simply screwed into a predetermined screw hole, and application of an adhesive or the like as in the related art is unnecessary, so that it is simple and easy. Good waterproofness is obtained.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal side view showing an example of a cable connector according to the present invention.

FIG. 2 is an enlarged side view of the distal end side of the cable connector of FIG. 1;

3 is an enlarged front view of the cable connector of FIG. 1 from the front end side.

FIG. 4 is an enlarged perspective view showing positioning means provided between a front insert and a connection side insert of the cable connector of FIG. 1;

5 is an enlarged perspective view showing a tension member stopper of the cable connector of FIG. 1;

FIG. 6 is a partial vertical sectional side view showing an example of a set screw with a seal ring according to the present invention.

FIG. 7 is a partially enlarged longitudinal side view showing a fixed state of the joint shell and the bent shell of the cable connector of FIG. 1;

FIG. 8 is a partial longitudinal side view showing a conventional cable connector.

[Explanation of symbols]

 200 Cable connector 210 Back shell 220 Tension member stopper 221 Tension member mounting portion 225 Core wire insertion portion 230 Bent shell 240 Joint shell 242 E-ring 244 Set screw 250A Front insert 250B Connection side insert 260 Guide shell 270 Fixing coupling 280 Elasticity Body bushing 290 Cable clamp 300 Set screw with seal ring 310 Screw head 320 Screw shaft 330 Ring stop 340 Seal ring 500 Positioning means 510 Guide pin 520 Guide hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tokuichi Ayuda 2-11-20 Nishigotanda, Shinagawa-ku, Tokyo Inside Daiichi Denshi Kogyo Co., Ltd. No. 1 Inside Furukawa Electric Co., Ltd. (72) Inventor Mitsuhiro Kurosawa 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Masamichi Tsuda 2-6-1 Marunouchi, Chiyoda-ku, Tokyo No. 1 F-term in Furukawa Electric Co., Ltd. F-term (reference) 2H036 QA02 RA12 3J040 AA01 AA13 BA01 EA16 FA05 HA03 HA15 5E021 FA05 FA08 FB10 FB14 FC02 FC32 FC40 HC19 HC31 5E087 EE03 EE11 FF03 FF14 GG12 MM03 MM03

Claims (5)

[Claims] A cable inserted into one of the cylinders of the back shell is fitted into and fixed to a tension member stopper in a cylinder of a cylindrical back shell. Wherein the tension member is mounted, and a core wire of the cable is inserted through a core wire insertion portion of the tension member stopper, and is led to the other side of the back shell. While mounting portions are provided on the fixing portion of the tension member stopper fitting inscribed in the cylinder of the back shell and the back shell, communication holes are respectively provided, and set screws with a seal ring are attached to these mounting holes,
A cable connector, wherein the tension member stopper is fixed. 2. A cylindrical, generally L-shaped bent shell is fixed to the other side of the back shell, and a column-shaped front insert is formed at the open end of the bent shell via a cylindrical joint shell. 2. A connection side insert and a cylindrical guide shell are mounted, and a core of the cable inserted into a core insertion portion of the tension member stopper is guided to the front insert. Connector for cable. 3. The joint shell is fixed to the outer periphery of the bent shell by an E-ring, and a set screw is screwed into a female screw hole provided in a part of the outer periphery of the joint shell, so that the joint shell is double-fixed. 3. The method according to claim 1, wherein
Cable connector as described. 4. A positioning means is provided between a front insert incorporated in a guide shell connected to the joint shell by the joint shell and a connection-side insert at a distal end side of the bent shell. Cable connector. 5. A seal ring provided with a ring stopper at an intermediate portion of a screw shaft slightly separated from a screw head, and an annular seal ring mounted between the ring stopper and the screw head. Set screw.