JPH11326676A - Optical closure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical closure which has sufficient collapse strength against downward collapse and tensile/compression strength against tension and compression of an optical cable, without being limited to the housing style of optical fiber excessive length and has good operability of the discrimination, reconnection, and branching of an optical fiber. SOLUTION: The optical closure is equipped with a closure sleeve 2, a connection plate 3 which is housed in the closure sleeve 2 along the length, and a support plate 4 which is arranged opposite the connection plate 3 and supports the closure sleeve 2 from the inside. The connection plate 3 consists of a main plate part 3a, which extends along the length and two end surface plate parts 3b extending from both the ends of the main plate part 3 at right angles and is provided with lock hook parts 3c at the tip parts of the end surface plate parts 3b, and the support plate 4 is provided with hook claw parts 4a by folding both its end parts, so that the lock hook parts 3c and lock claw parts 4a are engaged detachably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical closure used for a connection portion of an optical fiber cable (hereinafter, referred to as an optical cable).

[0002]

2. Description of the Related Art An optical closure or the like is installed at a connection portion of an optical line composed of an optical cable or the like, and a plurality of optical trays and extra length storage sheets installed on a metal support member inside the optical closure, etc. An optical connection portion of an optical fiber tape or the like (hereinafter, referred to as an optical fiber) and a surplus length of the optical fiber are stored and arranged. By storing and organizing the optical connection portions and extra lengths of the optical fibers in this manner, operations such as identification, reconnection, and branching of the optical fibers become easy.

FIG. 5 is a diagram showing an example of a conventional optical closure. The optical closure 21 includes a cylindrical closure sleeve 22, a main plate portion 23 a which is housed in the closure sleeve 22 along the longitudinal direction and extends in the longitudinal direction of the closure sleeve 22, and both ends of the main plate portion 23 a. The main connecting plate 23 includes two end plate portions 23b extending in a direction perpendicular to the main connecting plate 23; a central connecting plate 30 connected to the end plate portions 23b on both sides of the main connecting plate 23; A support plate 24 disposed to support the closure sleeve 22 from the inside;
3, a tension member holding portion 25 fixed to the end plate portions 23b on both sides, an optical cable holding portion 27 connected to the tension member holding portion 25 by a support rod 26, and a plurality of There are provided a plurality of extra length storage sheets 28 and a band-like band 29 for holding the extra length storage sheets 28.

The optical cable 31 drawn from both ends of the closure sleeve 22 is connected to the optical cable grip 2.
7 holds and is fixed. The above closure sleeve 2
The tension member 32 pulled out from the optical cable 31 in the inside 2 is gripped by the tension member gripper 25,
Fixed. The optical fibers 33 pulled out from the optical cable 31 in the closure sleeve 22 and connected to each other are stored in the extra length storage sheet 28 with their optical connection portions and extra length stored and arranged.

[0005] As shown in FIG. 6, a convex-shaped portion 23 c formed at the tip of an end plate portion 23 b of the main connecting plate 23,
When the concave-shaped portions 24a formed at both ends of the support plate 24 are detachably overlapped, the end plate portion 23b of the main connection plate 23 and the support plate 24 are connected. Thus, the end plate 23b of the main connecting plate 23 and the support plate 2
4 is made detachable so that the support plate 24
Can be easily attached and detached, and workability such as identification, reconnection, and branching of the optical fiber 33 can be improved.

[0006]

Such an optical closure 21 requires a crushing strength against crushing from above and a tensile / compression strength against tension / compression of the optical cable 31. Several conventional methods for crushing from above and tension / compression of an optical cable are known. For example, a method using a closure sleeve having a high crushing strength or a method using a closure sleeve having a low crushing strength are known. For example, a method of forming a metal skeleton inside the closure sleeve is used. However, these methods have the disadvantage that the closure sleeve becomes large and heavy.

As another method, as shown in FIG.
There is a method of coping with tension / compression of the optical cable 31 by using one or more connecting plates (the main connecting plate 23 and the central connecting plate 30 in the figure), and coping with crushing from above by the support plate 24. In this method, the closure sleeve 22 does not become large and heavy, but since a plurality of connection plates are used, the storage space for the extra length of the optical fiber is narrowed, and the extra length storage form is limited, and the extra length storage is limited. There is a problem that it cannot cope with the mainstream optical tray laminated type (book type).

In order to solve this problem, the support plate 24 also serves as a connecting plate, and the connecting plate has a structure of only one main connecting plate 23, thereby securing an extra-long storage space. A method is conceivable. However, as shown in FIG. 6, the support plate 24 only removably overlaps the end plate 23b of the main connecting plate 23 and is not fixed by bolts or the like. I can't take it. Therefore, in a structure in which only one main connecting plate 23 is used as the connecting plate, the tensile strength of the optical cable 31 with respect to the tensile strength is insufficient.

Therefore, an object of the present invention is to provide an optical fiber having sufficient crushing strength against crushing from above and tensile / compression strength against tension / compression of an optical cable without being limited by the storage form of the extra length of the optical fiber. Identification, reconnection,
An object of the present invention is to provide an optical closure with good workability such as branching.

[0010]

The object of the present invention is to provide a cylindrical closure sleeve, a connecting plate accommodated in the closure sleeve along a longitudinal direction, and a closure plate disposed opposite to the connection plate. A support plate for supporting the sleeve from the inside, wherein the connection plate includes a main plate portion extending in a longitudinal direction of the closure sleeve, and two end face plate portions extending from both ends of the main plate portion in a direction perpendicular thereto. A locking hook is provided at the tip of the end face plate, and the support plate has an umbrella-shaped cross section, and both ends are bent to provide locking claws. The problem is solved by an optical closure in which a locking hook and a locking claw are detachably fitted.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. 1 and 2 are views showing an example of the optical closure of the present invention. The optical closure 1 includes a cylindrical closure sleeve 2, a main plate portion 3 a that is housed in the closure sleeve 2 along the longitudinal direction and extends in the longitudinal direction of the closure sleeve 2, and both ends of the main plate portion 3 a. A connecting plate 3 comprising two end plate portions 3b extending at right angles to the connecting plate 3, and disposed opposite to the connecting plate 3, supporting the closure sleeve 2 from the inside, and connecting both ends to the end plate portions 3b. Support plate 4 and connecting plate 3
A tension member gripper 5 fixed to the end plate portions 3b on both sides of the optical member; an optical cable gripper 7 connected to the tension member gripper 5 by a support rod 6;
a, an optical tray 8 detachably stacked on the optical tray 8, a band-like band 9 for fixing the optical tray 8, an imaginary end face plate 10 for holding the closure sleeve 2, and the imaginary end face plate 1.
0 and connected to the overhead wire 12.

The closure sleeve 2 is configured so as to be disassembled and integrated, and seals the inside airtightly or watertightly during integration. Also, closure sleeve 2
Is usually formed from a synthetic resin material such as plastic. The connecting plate 3 is formed of a material having sufficient rigidity such as steel, and fixes the tension member gripping portion 5 and the optical cable gripping portion 6 to pull the optical cable.
It is responsible for tensile / compressive strength against compression. The support plate 4 is formed of a steel material or the like, and has an umbrella-shaped cross section as shown in FIG. 3, and has a crushing strength against crushing from above. The tension member gripping portion 5 is formed of steel or the like, and grips and fixes the tension member 14 by screwing a gripping bolt 5a. Optical cable gripping part 7
Is made of steel or the like, and holds and fixes the optical cable 13 by screwing the holding bolt 7a.

The optical tray 8 is formed of a synthetic resin material such as plastic, has a thin plate shape, and has an entrance through which an optical fiber 15 is inserted at a side surface thereof. The band 9 is formed of a synthetic resin material such as plastic, and is fixed to the main plate portion 3a and the support plate 4 with screws 9a. The aerial end face plate 10 is formed of a synthetic resin material such as plastic, and serves to seal both ends of the closure sleeve 2 and keep the cross-sectional shape of the closure sleeve 2 circular or elliptical. is there. Also, the fictitious end plate 10 includes:
A plurality of insertion openings for inserting the optical cable 13 are formed.

A locking hook 3c is provided at the tip of the end plate 3b, and a locking claw 4a is provided on the support plate 4 with both ends bent.
For example, as shown in FIG. 4, the locking hook 3c is sandwiched between the groove 3d cut in the width direction from both side surfaces of the front end of the end plate 3b bent at a right angle, and the two grooves 3d. It has an E-shape in which a torso 3e and a locking end 3f extending in both width directions from the torso 3e are formed. The locking claw 4a is formed with a notch 4b cut in the longitudinal direction from the end face of each end of the support plate 4 bent at a right angle, and protrusions 4c on both sides of the notch 4b. It has a concave shape.

The end face plate 3b and the support plate 4 are fitted with the groove 3d of the locking hook 3c and the projection 4c of the locking claw 4a, so that the notch 4b of the locking claw 4a and the locking hook are fitted. By fitting the body 3e of 3c, it can be detachably connected. The body 3e and the projection 4c lock the widthwise deviation between the end plate 3b and the support plate 4, and the locking end 3f and the projection 4c form the end plate 3b and the support plate 4.
Is locked in the longitudinal direction.

According to such an optical closure, the locking hook 3c and the locking claw 4a having the above-mentioned shapes are provided on the end plate 3b and the support plate 4 of the connecting plate 3, and these are fitted together. The end plate 3b and the support plate 4 are prevented from being displaced, and the support plate 4 receives the tension of the optical cable 13 applied to the end plate 3b, thereby providing the tensile / compression strength with respect to the tension / compression of the optical cable. . Further, since the locking hook 3c and the locking claw 4a are detachably fitted to each other, the support plate 4 can be easily attached and detached. Further, since the cross-sectional shape of the support plate is umbrella-shaped, the light tray 8 is widely protected and the crushing strength is improved.

The shape of the hook 3c and the hook 4a is not limited to the shape shown in FIG. 4. For example, the shape of the end plate 3b bent at a right angle may be A rectangular hole may be provided as a locking hook, and both ends of the support plate 4 bent at a right angle may be processed into a convex shape to form a locking claw. End plate 3b of support plate 3 and support plate 4
It is conceivable that the connection with the support plate 4 is performed by bolting or the like, but mounting and removing the support plate 4 becomes troublesome.
Workability such as identification, reconnection, and branching of the optical fiber 14 also deteriorates. Further, when these operations are performed in an imaginary state, there is a danger of falling of bolts and the like.

[0018]

As described above, in the optical closure of the present invention, the hooks are provided at the end of the end plate of the connecting plate, and the hooks are provided at both ends of the support plate. By fitting the locking hooks and the locking claws, the support plate has a structure that reinforces the crushing strength against crushing from above and the tensile / compression strength against the tension / compression of the optical cable. The crushing strength and the tensile / compression strength can be sufficiently provided without any special processing or additional components.
And there is no need to add an extra connecting plate for the purpose of reinforcement, and it is possible to secure a sufficient storage space for the optical fiber,
An excellent effect is obtained in that there is no restriction on the extra length storage form. Further, since the locking hook and the locking claw are removably fitted to each other, the support plate can be easily attached and detached, and the workability of identification, reconnection, branching, etc. of the optical fiber is also good. . Further, by making the cross-sectional shape of the support plate into an umbrella shape, the light tray can be widely protected and the crushing strength can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an optical closure of the present invention.

FIG. 2 is a side view showing an example of a structure of a connection plate and a support plate of the optical closure of the present invention.

3A and 3B are diagrams illustrating an example of a support plate of the optical closure of the present invention, wherein FIG. 3A is a side view of the support plate, and FIG. 3B is an end view of the support plate.

FIG. 4 is a perspective view showing an example of a connection portion between an end plate portion of a connection plate and a support plate of the optical closure of the present invention.

FIG. 5 is a side view showing an example of a conventional optical closure.

FIG. 6 is a perspective view showing an example of a connection portion between an end plate portion and a support plate of a connection plate of a conventional optical closure.

[Explanation of symbols]

1 ... light closure, 2 ... closure sleeve, 3 ...
Connecting plate, 3a: Main plate portion, 3b: End plate portion, 3c: Locking hook portion, 4: Support plate, 4a: Locking claw portion

Claims (1)

[Claims] 1. A tubular closure sleeve, a connecting plate housed in the closure sleeve along a longitudinal direction, and a support plate disposed opposite to the connecting plate and supporting the closure sleeve from inside. The connecting plate comprises: a main plate portion extending in the longitudinal direction of the closure sleeve; and two end plate portions extending from both ends of the main plate portion in a direction perpendicular to the main plate portion, and a tip of the end plate portion. The support plate has an umbrella-shaped cross-section, and both ends are bent to provide locking claws. These locking hooks and locking claws are provided. An optical closure characterized in that a part is detachably fitted to the part.