JP2972191B1 - Optical cable penetration closure - Google Patents

Abstract

A closure is formed by grasping both ends of a through optical cable and cutting off an inner jacket thereof, but without cutting off a center tension member. One of the optical cable gripping portions extends in the longitudinal direction of the optical cable. Sliding optical cable penetration closure. Of the optical cable gripping portions, only the gripping portion of the lead-in optical cable slides, and the other branch cable gripping portions do not slide. A rotatable rotation nut engages with the screw portion, and rotates the rotation nut to slide the optical cable grip. The optical cable grip is passed through the rotatable shaft together with the lever, the other end of the arm is rotatably connected to the end face of the closure, and the opposite end of the lever is loaded to slide the optical cable grip in the longitudinal direction. [Effect] The optical fiber can be easily taken out by drawing the portion of the optical cable through which the jacket is removed and bending the tension member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an optical cable penetration closure for connecting an optical cable to a branch cable.

[0002]

2. Description of the Related Art As a method of connecting an optical cable to a branch cable, a non-slotted closure is known.
Specifically, this is a method of removing the jacket of the intermediate portion of the optical fiber and connecting the optical fiber to a branch cable.

[0003]

As described above, when an optical cable is passed through, a closure is attached thereto and a branch cable is connected, it is desired to branch the contents even if the sheath of the optical fiber in the optical cable is cut off. There is a problem that the optical fiber cannot be easily taken out. This is due to the structure of the optical cable,
This is often caused by a structure in which a tension member is arranged at the center of a cable, a spiral groove is formed around the tension member, and an optical fiber is spirally wound in the groove. Therefore, as shown in FIG. 6, the optical fiber 2 cannot be easily taken out even if the jacket of the intermediate portion of the optical cable 1 to be passed is removed. FIG. 6 shows a conventional closure.
It is the schematic explaining the state which pulls out an optical fiber from a penetration optical cable. In FIG. 6, 1 is an optical cable (through), 2 is an (extended) optical fiber, and 5 is a branch cable. Therefore, there is a method of drawing the optical cable to bend the tension member and taking out the optical fiber from the groove by the slack.

[0004]

Means for Solving the Problems As a result of various studies on the above problems, the present inventors have found that the optical cable penetration closure has a structure in which one of the optical cable grips slides in the longitudinal direction of the optical cable. The present inventors have found that the optical fiber can be easily taken out by bending the center tension member of the optical fiber, and the present invention has been completed. That is, the present invention provides: In a closure formed by gripping both ends of a drawn-in optical cable and cutting off an inner jacket thereof, but not cutting off a central tension member, at least one of the optical cable gripping portions extends in a longitudinal direction of the optical cable. A sliding optical cable penetration closure is provided. Also,

Another feature is that, of the optical cable gripping portions, only the gripping portion of the lead-in optical cable slides, and the other branch cable gripping portions do not slide. In addition, a rotation nut rotatably attached to the optical cable gripping portion around the cable longitudinal direction is engaged with a screw portion provided on the closure end surface portion, and by rotating the rotation nut, the optical cable gripping portion is rotated in the longitudinal direction. It also has a feature in that it slides on. Also, an optical cable grip is passed through a rotatable shaft together with the lever, and the opposite end of the arm rotatably connected near the center of the lever is rotatably connected to the closure end face,
Another feature is that the optical cable gripper slides in the longitudinal direction by applying a force to the opposite end of the lever in the rotational direction.

Hereinafter, the present invention will be described in detail with reference to the drawings. The optical cable lead-in closure of the present invention is basically a closure formed by gripping both ends of a lead-in optical cable and cutting off an inner jacket but not cutting off a center tension member. It is characterized in that the portion has a structure that slides in the longitudinal direction of the optical cable with respect to the end face of the closure. FIG.
FIG. 2 is a cross-sectional view illustrating a typical structure of the optical cable lead-in closure of the present invention. In FIG. 1, 1 is a penetrating optical cable, 2 is a penetrating optical fiber, 3 is a gripping part of the penetrating optical cable, 31 is a slidable gripping part, 4 is a tension member in the penetrating optical cable, 5 is a branch cable,
Reference numeral 6 denotes a branch cable gripping portion, 7 denotes a suspension line, 8 denotes a suspension portion of the closure, 9 denotes an end surface of the closure, and A denotes a closure.

In FIG. 1, the optical cable lead-in closure of the present invention is attached to a suspension line 7 via a suspension part 8 of a closure A when the lead-in optical cable 1 is branched and connected to a branch cable 5 in a bridge type closure. At least one of the grips 3 of the optical cable 1 is a slidable grip 31. The grip 6 of the branch cable 5 is integrated with the closure A. If the slidable grip portion 31 is slid inward in the direction of the arrow with respect to the closure A in this state, only the optical fiber 1 moves in the longitudinal direction, and the tension member 4 in the optical cable bends and pulls. Since the optical fiber 2 of the through optical cable 1 is slack, it can be easily pulled out. In this case, the closure end face 9 is fixed to the hanging wire 7, but there is also an example in which the closure end face 9 is fixed to a metal object in the underground manhole. In any case, the optical cable 1 is drawn in the direction of the arrow. It is sufficient if there is a fixed part that bears the force. Similarly, the branch cable 5 may be configured to move in the direction of the arrow, but it is not necessary to move the branch cable 5 because a branch cable may already be connected.

[0008]

The optical cable lead-in closure of the present invention has the following structural features, and therefore has the following features. (i) Since at least one of the optical cable grips slides in the longitudinal direction of the optical cable (Claim 1), by changing the distance between the opposing optical cable grips in the optical cable longitudinal direction, the inner side of the optical cable grips. There is an advantage that the center tension member from which the jacket has been cut is bent and the optical fiber is easily taken out by slackening the optical fiber. (ii) Furthermore, if the gripping portion of the optical fiber cable of the optical cable gripping portion slides and the other branch cable gripping portion does not slide (claim 2), the branch cable is already connected. When used, there is the advantage of working as little as possible.

(Iii) The distance between the end face of the closure and the optical cable gripping portion can be freely adjusted by rotating the rotating nut which engages with the fixing screw portion so that the optical cable gripping portion slides in the longitudinal direction. There is an advantage that can be controlled. In this case, the rotation nut may be rotatably attached to the end face of the closure, and the screw portion may be attached to the optical cable holding portion. (Iv) Since the lever and the arm rotatably connected to each other are rotatably connected to the end face of the closure (Claim 4), the lever and the arm are rotatably connected to each other via the rotatably connected portion. There is an advantage that the bending operation can be used for sliding the optical cable gripping portion.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below, but these do not limit the scope of the present invention. (Embodiment 1) FIG. 2 is a longitudinal sectional view showing the structure of the optical cable penetration closure of the present invention. FIG. 3 is a cross-sectional view showing the structure of the optical cable penetration closure of the present invention. 2 to 3, reference numeral 1 denotes a penetrating optical cable, reference numeral 2 denotes an optical fiber, reference numeral 4 denotes a tension member, reference numeral 9 denotes a closure end face portion, reference numeral 11 denotes a rotating nut (rotatably fixed to a slidable holding portion 31), Reference numeral 12 denotes a screw portion (fixed to the closure end surface portion 9), 32 denotes a jacket holding member, 33 denotes a jacket holding screw, and 91 denotes a sliding base (connected or integrated with the closure end surface portion 9).

In FIG. 2 and FIG.
Is held by a slidable grip portion 31 by pressing the jacket retainer 32 with a jacket holding screw 33, and the slidable grip portion 31 is connected to or integrated with the closure end surface portion 9. It is slidably incorporated in the formed sliding base 91. A screw portion 12 is fixed to the end face portion 9 of the closure in the longitudinal direction, and a rotating nut 11 is fitted thereto. The opposite end is rotatably fixed to a slidable grip portion 31. By rotating the rotating nut 11, the slidable grip portion 31 slides, and accordingly, the optical cable 1 can slide as shown by the arrow. In order to easily obtain the force for rotating the rotating nut 11, the handle 20 may be attached in the radial direction of the rotating nut to facilitate obtaining the rotating torque. Further, at least a part of the cross-sectional shape of the rotating nut 11 is formed into a “U” shape or a hexagon,
By using a spanner or the like, rotation can be facilitated. The rotation nut 11 may be rotatably connected to the closure end face portion 9, and the screw portion 12 may be provided in the slidable optical cable holding portion 31.

(Embodiment 2) FIG. 4 is a cross-sectional view showing the structure of another optical cable lead-in closure according to the present invention. FIG. 5 is a longitudinal sectional view showing the structure of another optical cable lead-in closure according to the present invention. 4 and 5, reference numeral 1 denotes a penetrating optical cable, 5 denotes a branch cable, 9 denotes a closure end face, 13 denotes a roller, 14 denotes a lever, 15 denotes a shaft, 16 denotes an arm, 17 denotes a cable fixing portion, and 31 denotes a slidable member. The reference numeral 33 designates an outer cover holding screw, and 91 a sliding base. In FIGS. 4 and 5, the slidable grip 31 is connected to the shaft 15.
Rollers 13 are provided at both ends of the shaft 15, and can freely rotate and slide on the sliding base 91.

A lever 14 is passed through the shaft 15, and a central portion of the lever 14 is rotatably connected to an opposite end of an arm 16 having one end rotatably connected to the closure end face portion 9. When the lever 14 is moved in the direction of the arrow, the roller 13 slides along the sliding base 91 in the direction of the arrow, and the optical cable 1 can be slid along with it. In this case, as shown in FIG. 4, the operation of the lever 14 is such that when the lever is pulled, the link and the moving part coincide with each other, so that the rotational moment can be transmitted most effectively, and the link and the moving part are offset. This is advantageous as compared with the case of pushing. The branch cable 5 is fixed to the sliding base 91 by being gripped by the jacket holding screws 33. The force during sliding of the lever 14 and the roller 13 is applied to the lever 1
By adding a ratchet mechanism or a brake mechanism on the slide without receiving only the force applied to the lever 4, the force applied to the lever 14 can be reduced, and the operation can be facilitated.

[0014]

As described above, according to the optical cable lead-in closure of the present invention, the portion where the jacket of the lead-in optical cable is removed is drawn to bend the tension member, so that the optical fiber can be easily taken out.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a typical structure of an optical cable lead-in closure according to the present invention.

FIG. 2 is a longitudinal sectional view showing a structure of an optical cable penetration closure of the present invention.

FIG. 3 is a cross-sectional view showing the structure of the optical cable penetration closure of the present invention.

FIG. 4 is a cross-sectional view showing the structure of another optical cable lead-in closure according to the present invention.

FIG. 5 is a longitudinal sectional view showing the structure of another optical cable penetration closure of the present invention.

FIG. 6 is a schematic diagram illustrating a state in which an optical fiber is pulled out from a passing optical cable in a conventional closure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Penetration optical cable 2 Penetration optical fiber 3 Penetration optical cable gripping part 4 Tension member in the penetration optical cable 5 Branch cable 6 Branch cable gripping part 7 Suspension line 8 Closure suspension part 9 Closure end face part 11 Rotating nut 12 Screw part 13 Roller 14 Lever 15 Axis 16 Arm 17 Cable fixing part 31 Sliding grip part 32 Jacket holding 33 Jacket holding screw 91 Sliding base A Closure

──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuo Nakajima, 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Chubu Electric Power Co., Inc. (72) Inventor Shinichi Tanaka, 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture, Chubu Electric Power Company ( 56) References JP-B-55-41086 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02B 6/46 G02B 6/24

Claims (4)

(57) [Claims] 1. A closure formed by gripping both ends of a lead-in optical cable and cutting an inner jacket thereof without cutting a center tension member, wherein at least one of the optical cable gripping portions slides in a longitudinal direction of the optical cable. An optical cable penetration closure characterized by moving. 2. The optical cable penetration closure according to claim 1, wherein, of the optical cable gripping parts, only the gripping part of the lead-in optical cable slides, and the other branch cable gripping parts do not slide. 3. An optical cable gripping portion, wherein a rotation nut rotatably attached to the optical cable gripping portion around a cable longitudinal direction as an axis engages a screw portion provided on a closure end face portion and rotates the rotation nut. The optical cable penetration closure according to claim 1 or 2, wherein the member slides in a longitudinal direction. 4. An optical cable gripper is passed through a rotatable shaft together with a lever, and the opposite end of an arm rotatably connected near the center of the lever is rotatably connected to an end face of the closure, and the opposite end of the lever is rotated. The optical cable penetration closure according to claim 1 or 2, wherein the optical cable gripper slides in the longitudinal direction by applying a force to the end in the rotational direction.