JPH09140021A - Connector and connecting method for communication line inserting tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector and a connecting method for a communication line inserting tube which facilitate the setting work for the length of the tube, and make it possible to feed a communication line smoothly. SOLUTION: There are an inlet-side connecting port 2 and an outlet-side connecting port 3 on the left and right of a body part 1. A hole for inserting a communication line tube connects both connecting ports, and has an equal diameter port 1a and a tapered part 1b being a guiding part whose inside diameter changes from that of the equal-diameter part 1a to a smaller one. As an inlet-side tube 7 one having an outside diameter slightly smaller than the inside diameter of the equal diameter part 1a is used, and as an outlet-side tube 8, one having an inside diameter equal to or larger than the smaller-diameter-side inside diameter of the tapered part 1b is used. The connecting ports 2, 3 have coming-off preventing mechanisms composed of claw detaching members 4 and coming-off preventing claws 5, and hermetically sealing mechanisms of sealing member 6 put in their circumferential grooves.

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 communication line and a tube for connecting a communication line and a tube, which is used in a pressure-feeding method in which a communication line such as an optical fiber is laid in a tube by an air flow. It is about the method.

[0002]

2. Description of the Related Art As a method for laying an optical fiber, there is known a pressure feeding method in which an optical fiber is blown into a tube by an air flow to lay it. In this construction method, the tube route is changed by changing the connection of a plurality of tubes in the tube assembly type cable. In such a case, a connector for connecting the tubes is necessary. Conventionally, a commercially available general-purpose air pipe joint has been used as a connection connector for communication line transmission tubes.

FIG. 3 is a schematic structural view of a conventional connector for connecting a communication line transmitting tube. FIG. 3 (A) is a sectional view showing a state in which the tube is attached, and FIG. 3 (B) is when the tube is pulled out. FIG. In the figure, 4 is a claw releasing member,
5 is a removal preventing claw, 6 is a sealing member, 11 is a main body, 11
a is an abutting surface and 12 is a tube. This figure shows an outline of those described in Japanese Utility Model Laid-Open No. 62-97387, the catalog (No. TF1-02, P.4) of Pisco Japan Co., Ltd., and the like.

In FIG. 3 (A), this communication wire transmission tube connector has a disconnection preventing mechanism composed of a claw disengaging member 4 and a disengagement preventing claw 5 and a circumferential groove in order from the tube connecting port of the main body 11. There is an airtight seal mechanism in which a seal member 6 such as a seal rubber is accommodated, and a step is provided further inside. This step is the abutting surface 1 of the tube 12.
1a, and the tip of the tube 12 stops at this position. The inner diameter of the communication wire tube insertion hole through which the tube 12 passes is slightly larger than the outer diameter of the tube 12 including the part for the removal prevention mechanism and the airtight sealing mechanism. On the other hand, the inner diameter of the communication wire tube insertion hole deeper than the abutting surface 11a is substantially equal to the inner diameter of the tube 12. Fall prevention claws 5
Is, for example, a dish-shaped washer having internal teeth, and when the inserted tube 12 is to be pulled out, the internal teeth bite into the tube so that it does not come off.

As shown in FIG. 3 (B), when pulling out the tube 12, the claw releasing member 4 is pushed in from the connection port.
The projection provided at the tip of the claw detaching member 4 acts to remove the internal teeth of the slip-out preventing claw 5 from the tube 8, so that the withdrawal can be performed. The claw releasing member 4 itself does not come out because it engages with the inner edge of the open end of the main body 21.

[0006] On the other hand, in the above-mentioned pressure-feeding method, a tube-assembled type cable containing a plurality of communication line connecting tube connections is often used. In recent years, with the expansion of optical communication technology, the number of terminal devices has increased dramatically, and the number of optical fibers required for connection to many terminals has increased. For this reason, the number of tubes accommodated in the tube assembly type cable is also significantly increased.

In order to attach the communication line transmitting tube to the communication line transmitting tube connecting connector at the end of the tube assembly type cable, it is necessary to align the connector position with the end of the tube. However, in the tube assembly type cable, the position of this tube is different for each tube. Also, on the connector holding plate in the terminal box,
The mounting position of this connector differs depending on the connector due to the size and arrangement of the connection connector for communication line transmission tube. For this reason, in many cases, the distance from the outer sheath removal point of the tube assembly type cable to the communication wire transmission tube connector is different for each tube. Therefore,
Cumbersome work such as cutting down the tube length according to this connector position was required.

Further, in the conventional connector for connecting a communication line through tube, the tubes on both sides are bent and fitted between them to join them. However, the length of the bare tube in the jacket removing portion of the tube assembly type cable is long. If there is not enough space, the tube may be broken when it is bent, for example, when it is covered at the jacket removal point.

For this reason, in order to provide the communication line transmitting tube with a degree of freedom or to secure the length of the bare tube, the connector for the communication line transmitting tube is provided from the outer sheath removing point of the tube assembly type cable. Had to take a long distance to. As a result, the terminal box becomes large, which has been a cause of problems such as price, weight, and installation location of the terminal box.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in a cable terminal such as a tube assembly type cable, a communication wire transmission tube is attached to a connection connector for communication wire transmission tube. In this case, it is possible to easily set the tube length, to smoothly feed the communication line, and to provide a connection connector for the communication line transmission tube and a connection method which can be connected without greatly bending the communication line transmission tube. To aim.

[0011]

According to a first aspect of the present invention, there is provided a communication line transmitting tube connecting connector, wherein a first communication line transmitting tube connecting port and a second communication line transmitting tube are provided. Communication port and a communication line communication tube insertion hole communicating the first and second communication line communication tube connection ports, and the communication line communication tube insertion hole has a predetermined length having an equal inner diameter. And a tapered guide portion adjacent to the equal-diameter portion and changing from an inner diameter equal to the inner diameter of the equal-diameter portion to a smaller inner diameter along the feeding direction of the communication line. Is.

According to a second aspect of the present invention, in the communication wire connecting tube connecting connector according to the first aspect, the tube is prevented from coming off at the first and second communication wire connecting tube connecting ports. It has a member and an airtight seal member.

According to a third aspect of the present invention, in the method of connecting a communication wire through tube, in the direction of sending the communication wire between the first predetermined position and the second predetermined position of the communication wire tube insertion hole. Using a communication line communication tube connection connector having a member for guiding communication of the communication line, the communication line communication tube on the communication line sending side is inserted with a pushing length in a range up to the first predetermined position, The communication line feeding tube on the sending side of the communication line is characterized by being inserted up to the second predetermined position.

[0014]

1 is a sectional view for explaining an embodiment of a connector for a communication wire transmission tube according to the present invention. In the figure, the same parts as those in FIG. Reference numeral 1 is a main body portion, 1a is a constant diameter portion, 1b is a tapered portion, 1c is an abutting surface, 2 is an inlet side connecting port, 3 is an outlet side connecting port, 7 is an inlet side tube, and 8 is an outlet side tube.

In this embodiment, the inlet side connecting port 2 and the outlet side connecting port 3 of the communication line transmitting tube are provided on the left and right of the main body 1.
And a communication line tube insertion connector having a communication line tube insertion hole that communicates both connection ports with each other, and the communication line tube insertion hole has an equal inner diameter and a predetermined length. A portion 1a and a tapered portion 1b which is adjacent to the equal-diameter portion 1a and changes from an inner diameter equal to the inner diameter of the equal-diameter portion 1a to a smaller inner diameter are provided along the feeding direction of the communication line to the right in the drawing. I have. As the inlet side tube 7 connected to the inlet side connecting port 2, one having an outer diameter slightly smaller than the inner diameter of the equal-diameter portion 1a is used, while as the outlet side tube 8 connected to the outlet side connecting port 3. Has an inner diameter equal to or larger than the inner diameter on the small diameter side of the tapered portion 1b.

For both the inlet side connecting port 2 and the outlet side connecting port 3, a slip-off preventing mechanism similar to the above-mentioned prior art, for example, a claw disengaging member 4 and a slip-out preventing claw 5, and a circumferential groove, for example, are provided. There is an airtight sealing mechanism that is formed by housing the sealing member 6. The inner diameters of the detachment prevention mechanism and the airtight sealing mechanism are set to the same inner diameter as that of the equal-diameter portion 1a. Therefore, the outer diameter of the outlet side tube 8 is
The outer diameter of the outlet side connection port 3 is slightly smaller than the inner diameter of the airtight sealing mechanism. As a modified example, a similar equal-diameter portion may be provided at the back of the slip-out preventing mechanism of the outlet-side connection port 3 and the airtight sealing mechanism, and the taper portion 1b may be adjacent. The removal prevention mechanism and the airtight sealing mechanism may be omitted if the degree of close contact between the communication line communication tube and the connection connector for the communication line communication tube is appropriate.

In the above-mentioned connector for communication line transmission tube, the equal diameter portion 1a is provided on the inlet side connection port 2 side, so that the inlet side tube 7 can be freely moved in this region of the communication line tube insertion hole. It can be pushed in at any push-in length. Further, after that, the inlet side tube 7 can be pulled back halfway by pushing the claw releasing member 4. On the other hand, since the small diameter side of the tapered portion 1b is located on the outlet side connection port 3 side, the outlet side tube 8 can be pushed to a predetermined length with this position as the abutting surface 1c.

When the optical fiber is laid in the tube by the air flow, the optical fiber sent from the inlet side tube 7 passes through the communication line tube insertion hole of the connection connector for the communication line transmission tube. , To the outlet side tube 8. The tapered portion 1b is an example of a guide member that smoothly transmits the communication line, and the tapered portion 1b that follows the equal-diameter portion 1a guides the transmission of the optical fiber in the feeding direction of the optical fiber, so that the outlet is provided. The introduction into the side tube 8 is smooth. The tapered portion 1b is
It may be formed integrally with the main body portion 1 or may be formed as a separate member by being fitted inside the communication wire tube insertion hole.

Instead of the tapered portion 1b, it is possible to provide a convex portion for reducing the inner diameter of the communication wire tube insertion hole and use this as the abutting surface 1c of the outlet side tube 8. Also in this case, the insertion length of the inlet tube 7 can be made variable. However, if the distance from the end of the inlet tube 7 to this convex portion becomes long, the optical fiber sent from the end of the inlet tube 7 may collide with the step on the inlet side of the convex portion. In the worst case, the optical fiber may be caught and it may be impossible to transmit the optical fiber.

On the other hand, the tapered portion 1b has the same diameter portion 1a.
Since the inner diameter of the optical fiber changes to a smaller inner diameter, even if the optical fiber collides with the taper portion 1b, the traveling direction of the optical fiber is inward, so that the introduction into the outlet side tube 8 is smooth. If the inner diameter of the outlet tube 8 is equal to or larger than the inner diameter of the taper portion 1b on the small diameter side, the end portion of the outlet tube 8 does not protrude from the taper portion 1b, which is preferable in avoiding a collision. is there.

The material of the main body 1 is preferably hard plastic such as acrylic or polycarbonate, but may be made of metal. When acrylic and polycarbonate are used in a transparent state, the insertion state of the inlet side tube 7 and the outlet side tube 8 can be observed from the outside.

A method of connecting the connector for connecting a communication wire of the present invention will be described. The ends of the tube-assembled cables are drawn into the connection box from above and below, respectively, and the jacket of the end of each tube-assembled cable is removed over a substantially predetermined length. Example of connecting a specific inlet-side tube 7 housed in the inlet-side tube-assembled cable and a specific outlet-side tube 8 housed in the outlet-side tube-assembled cable with a communication wire transmission tube connector explain.

The inlet side tube 7 is slightly bent and pushed deeply into the inlet side connecting port 2 so that the outlet side connecting port 3 and the outlet side tube 8 face each other. Claw release member 4 on the inlet side connection port 2 side
The connection work is finished by pushing in to shorten the pushing length of the inlet side tube 7, and at the same time, by fitting the outlet side tube 8 from the outlet side connecting port 3 side to the butting surface 1c.

FIG. 2 is an explanatory view of a variable range of the pushing length in the embodiment of the present invention. FIG. 2 (A) shows the shortest pushing length, and FIG. 2 (B) shows the pushing length. It is explanatory drawing at the time of the longest. In the figure, the same parts as those in FIGS.

As shown in FIG. 2 (A), when the end portion of the inlet side tube 7 is at the shortest depth that can be hermetically sealed by the hermetic sealing mechanism on the inlet side connection port 2 side, the pushing length is the maximum. It gets shorter. This depth is approximately equal to the position of the right end of the circumferential groove in which the seal member 6 is housed. As shown in FIG. 2B, when the end portion of the inlet side tube 7 is at the depth of the left end portion of the tapered portion 1b, the pushing length is the longest.
Therefore, the inlet side tube 7 can be retained by the slip-out preventing claw 5 at any position within the range from the left end to the right end of the equal-diameter portion 1a, and the pushing length can be changed, so that the inlet-side tube 7 can be moved from the left end of the equal-diameter portion 1a. The length to the right end gives the freedom of tube length. On the other hand, the outlet side tube 8 can be fixed in a position-invariant state.

The length of the equal-diameter portion 1a is L, the slip-off preventing mechanism composed of the claw-separating member 4 and the slip-out preventing claw 5, and the airtight sealing mechanism in which the seal member 6 such as seal rubber is housed in the circumferential groove are combined. The length of both left and right is A. Both the inlet side tube 7 and the outlet side tube 8 are connected without bending, and in order to minimize the distance between them, the outlet side tube 8 is pushed with the inlet side tube 7 pushed deepest. The inlet side tube 7 may be located at the left end of the equal-diameter portion 1a when the outlet side tube 8 is fitted to the abutting surface 1c so as to be in contact with the outlet side connection port 3. At this time, since L becomes equal to A, L becomes A
It is desirable to make the above.

In this embodiment, since the degree of freedom of the tube length is large, the allowable tolerance of the tube length is large. Therefore, unlike the prior art, it is not necessary to perform the dimension adjustment while cutting the length of one collective tube cable at the end. Therefore, the complicated work of cutting the inlet side tube 7 and the outlet side tube 8 according to the position of the communication line transmitting tube connecting connector is not required. Further, in addition to having a large allowable tolerance, it is not necessary to bend the inlet side tube 7 and the outlet side tube 8 to a large extent, so that it is not necessary to secure an extra length and the size of the connection box can be reduced.

In the above description, the method of fixing the inlet side tube 7 and the outlet side tube 8 to the connection box is omitted. Inlet tube 7 and outlet tube 8
Can be fixed to the connection box by using a fixing member in the vicinity of the respective jacket removal points of the inlet-side and outlet-side collective tube cables. In this case, in the space between the two tube fixing members, the tube route can be changed by connecting the inlet side tube 7 and the outlet side tube 8 to be connected with this communication line connecting tube connecting connector. it can.

By displacing the positions of the connection connectors for communication line transmission tubes alternately by the tube route, it is possible to avoid adjoining the connection connectors for communication line transmission tubes, and thus the inlet side tube 7 and the outlet side tube. 8
The overall spread of the can be suppressed. The connection connector for the communication line transmission tube can be attached to the connection box as in the conventional case.

[0030]

EXAMPLES A specific example of the connector for communication line transmission tube according to the embodiment of the present invention will be described. The inlet side tube 7 and the outlet side tube 8 for communicating the communication line have an outer diameter of 8 m.
m and inner diameter 6 mm. Corresponding to these communication line transmission tubes, the length L of the equal length part that gives the degree of freedom of the tube length
Is a connector for communication line transmission tube designed to be 50 mm. The length of the tapered portion 1b is 12 mm, and the minimum inner diameter of the taper is 5 mm. The structure of the claw detachment member 4, the slip-out preventing claw 5, the seal rubber 6 and the like is the same as the conventional one, and the combined length A of the slip-out preventing mechanism and the airtight sealing mechanism is 10 mm.

Even if the length from the sheath removal portion of the collective tube cable to the end of the bare tube is about 100 mm, it is possible to connect the communication line transmission tubes between the two collective tube cables. It was In the prior art, the bare tube required a length of about 150 to 200 mm.
An airtightness test with air of 10 atm and an indentation experiment of an optical fiber having an outer diameter of 3 mm were carried out by changing the pushing length of the inlet side tube 7. Push-in length of inlet tube 7 0-50
Airtight performance and optical cord transmission performance in the mm range are good,
There was no difference due to the indentation length.

[0032]

According to the first aspect of the present invention, the first communication line communication tube connection port, the second communication line communication tube connection port, and the first and second communication lines are provided. Has a communication line transmission tube insertion hole that communicates with the connection port for the transmission tube,
The communication wire communication tube insertion hole has an equal-diameter portion of equal length with a predetermined length, and a tapered guide portion adjacent to this equal-diameter portion that changes from an inner diameter equal to the inner diameter of the equal-diameter portion to a smaller inner diameter. Since it has along the sending direction of the communication line,
With respect to the tube on the sending side of the communication line, there is an effect that the pushing length can be set to an arbitrary distance within the range of the predetermined length of the equal diameter portion.

Therefore, there is an effect that a complicated work such as cutting the tube in accordance with the position of the communication wire transmitting tube connector is not required. Also, the tube can be connected without being bent significantly. As a result, it is not necessary to secure an extra length, the terminal box can be made small, and there is an effect that problems such as the price, weight, and installation place of the terminal box do not occur. When laying the communication wire in the tube by the air flow, regardless of the length of the push-in length of the tube on the sending side of the communication wire, the introduction from the tube on the sending side of the communication wire to the tube on the sending side is smooth. There is an effect that.

According to the second aspect of the present invention, the first and second communication line transmission tube connection ports are provided with a tube removal preventing member and an airtight seal member.
The airtightness is good, and the airtightness does not change even if the pushing length is changed.

According to the third aspect of the present invention, a member for guiding the communication line in the communication line feeding direction is provided between the first predetermined position and the second predetermined position of the communication line tube insertion hole. The communication line communication tube on the sending side of the communication line is first
Inserted with a push-in length in the range up to the predetermined position, the communication line sending tube on the sending side of the communication line is inserted to the second predetermined position, so for the communication line sending tube on the sending side of the communication line, There is an effect that the pushing length can be set to an arbitrary depth equal to or less than the depth of the predetermined position.

Therefore, there is an effect that a complicated work such as cutting down the communication line transmitting tube according to the position of the connector for the communication line transmitting tube is not required. In addition, the communication line communication tube can be connected without being greatly bent. As a result, there is an effect that it is not necessary to secure an extra length, the terminal box can be made small, and problems such as the price, weight, and installation place of the terminal box do not occur. When the communication line is laid in the communication line communication tube by the air flow, regardless of the pushing length of the communication line communication tube on the communication line sending side, from the communication line sending tube on the communication line sending side There is an effect that introduction into the communication line transmission tube on the sending side becomes smooth.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a connection connector for communication wire transmission tube of the present invention.

FIG. 2 is an explanatory diagram of a variable range of a pushing length according to the embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional connection connector for communication line transmission tube.

[Explanation of symbols]

1 ... Main body part, 2 ... Entrance side connection port, 3 ... Exit side connection port, 4
... claw release member, 5 ... removal prevention claw, 6 ... seal member, 7 ...
Inlet side tube, 8 ... Outlet side tube.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuo Hokari 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. A connection port for a first communication line transmission tube,
Second communication line transmission tube connection port, first and second
The communication line communication tube insertion hole communicating with the communication line communication tube connection port of the communication line communication tube insertion hole, the communication line communication tube insertion hole having an equal inner diameter of a predetermined length, and the same diameter. A connector for a communication wire through tube, which has a tapered guide portion adjacent to the portion and changing from an inner diameter equal to the inner diameter of the equal diameter portion to a smaller inner diameter along the feeding direction of the communication wire. 2. The communication line transmitting tube according to claim 1, wherein the first and second communication line transmitting tube connection ports have a tube slip-off preventing member and an airtight seal member. Connector. 3. A connection for a communication line through tube having a member for guiding communication of the communication line in the direction of sending the communication line between the first predetermined position and the second predetermined position of the communication line tube insertion hole. The connector is used to insert the communication line feeding tube on the sending side of the communication line with the pushing length within the range up to the first predetermined position, and the communication line feeding tube on the sending side of the communication line is set to the second predetermined position. A method for connecting communication line transmission tubes, which is characterized by inserting up to.