JP3093180B2 - Light closure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical closure.

[0002]

2. Description of the Related Art For example, in a so-called post-branching operation in which an optical line is branched from the middle of a completed optical cable, the optical cable is drawn to a target branch position and bent, and an optical fiber (optical fiber core) is connected to the optical cable. ) Is required. At this time, there are cases where the tension member of the optical cable is cut and cases where it is not cut, but considering the effect on the actual line, the case where the tension member is not cut is superior in not touching the optical fiber more than necessary. is there. In addition, an optical cable generally has a structure in which a multi-core tape is housed as an optical fiber in view of the demand for multi-core. In this type of optical cable, a so-called SZ cable is used in response to a post-branching operation after installation. However, in view of the cost and the like, most of the optical cables are one-way twisted ones in which a multi-core tape is spirally wound in one direction and stored.

[0003] In recent years, the number of cases in which a post-branch optical cable is re-branched later has increased. Considering the re-branching method in which the one-way twisted optical cable is branched without cutting the tension member, (1) an optical fiber that may branch when assembling an optical closure that stores the branch position And (2) a method of once removing the optical cable from the optical closure, bending the optical fiber to take out the optical fiber, cutting the optical fiber, and then returning the optical cable to the optical closure.

[0004]

The above-mentioned (1)
In the method of (1), there is a possibility that a useless optical fiber not used for branching may be generated, and it is difficult to flexibly cope with a newly generated optical fiber to be branched. Further, in the method (2), there is a problem that the work of taking out and re-storing the optical cable from the optical closure and the work of bending the optical cable to take out the optical fiber easily affect the communication of the actual line.

The present invention has been made in view of the above-mentioned problems. (A) The optical cable is gripped and fixed to a gripping component by a structure in which the length of the connecting rod expands and contracts by sliding movement of the slide member with respect to the connecting rod main body. It is possible to extend and retract the connecting rod while keeping the optical cable, so that the optical cable can be post-branched without substantially affecting the actual line. (B) By expanding and contracting the connecting rod while holding the optical cable to the gripping part (C) The relative sliding movement between the connecting rod body and the slide member is regulated by the fixing means, so that the pull acting on the pair of gripping parts from the optical cable. (D) and (c), it is necessary for the operator to directly maintain the drawn state of the optical cable. (E) It is an object of the present invention to provide an optical closure which can be easily re-branched after branching. Is what you do.

[0006]

According to the present invention, there is provided a closure sleeve detachably mounted in the middle of an optical cable, and an elongated connecting rod housed in the closure sleeve along the optical cable. The connecting rod has an elongated connecting rod main body, and a slide member attached to the connecting rod main body so as to be slidable along the longitudinal direction thereof and having a variable protrusion size from the longitudinal end of the connecting rod main body. Fixing means for switching the fixing / unfixing of the slide member to / from the connecting rod main body; and the optical cable respectively distributed to the connecting rod main body and the slide member so as to be separated from both ends in the longitudinal direction of the connecting rod. And a pair of gripping parts for gripping and fixing the optical fiber. A plurality of trays for storing the optical connection portions of the optical fibers and the extra connection length are stacked, and even after the optical connection portions and the extra connection length of the optical fibers are stored in the tray, the optical cable is gripped and fixed to the grip component. An optical closure characterized in that the connecting rod can be extended and contracted while keeping it as the means for solving the problem.

[0007] As the optical cable, the type of optical fiber (optical fiber core) housed inside, the number of optical fibers,
Various configurations can be adopted for the twist form of the optical fiber and the like. Various shapes can be adopted as the closure sleeve. In the closure sleeve, the presence or absence of the cut of the tension member of the optical cable may be either.
Both the connecting rod main body and the slide member are formed of a material having sufficient rigidity such as a steel material. The entire length of the connecting rod expands and contracts by changing the projecting dimension of the slide member from the longitudinal end of the connecting rod main body. Both the connecting rod main body and the slide member can be formed to be long, so that the expansion and contraction stroke of the connecting rod can be increased. As fixing means,
Various configurations such as a stopper, a clamp fixing unit, and an engagement claw can be adopted. When the sliding movement of the slide member with respect to the connecting rod main body is regulated by the fixing means, the connecting rod bears and supports a load such as a tensile force applied from the optical cable gripped and fixed by the pair of gripping parts, thereby controlling the state of pulling of the optical cable. maintain. When the fixing means is operated to permit relative sliding movement between the connecting rod body and the slide member, the length of the connecting rod can be freely changed.

[0008]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter the present onset Ming first embodiment, FIG. 1 (a), will be described with reference to FIG. 3 (b). FIG.
(A), (b) shows the optical closure 1 of 1st Embodiment. The optical closure 1 includes a closure sleeve 3 assembled in the middle of two types of optical cables 2a and 2b having different diameters, and an optical cable 2a inside the closure sleeve 3.
An elongated connecting rod 4 accommodated along 2b, and a plurality of trays 6 stacked on a support table 5 fixed to the center of the connecting rod 4 in the longitudinal direction are provided.

The optical cables 2a and 2b are
(Multi-core optical fiber ribbon) A unidirectional twisted cable that accommodates a large number of cables. At a central portion in the closure sleeve 3, a target branching position 20 where the optical cable 2a or 2b is to be branched in a subsequent process is disposed. The closure sleeve 3 has a half-cylindrical shape.

As shown in FIG. 2, the connecting rod 4 includes an elongated connecting rod body 11 (outer rail) and the connecting rod body 11.
The slide member 12 (inside) is attached so as to be slidable along the longitudinal direction thereof and has a variable protrusion size from one longitudinal end 11a of the connecting rod main body 11 (hereinafter referred to as “the connecting rod main body one end”). Rail) and fixing means 13 (thumb screw) for switching between fixing / unfixing of the slide member 12 with respect to the connecting rod main body 11. The entire length of the connecting rod 4 can be expanded and contracted by changing the projecting dimension of the slide member 12 from the connecting rod main body 11 (arrow in FIG. 2). The thumb screw which is the fixing means 13 is inserted into through holes (not shown) formed at a plurality of positions in the longitudinal direction of the slide member 12 and screwed to the one end portion 11 a of the connection rod body, thereby connecting the slide member 12 to the connection rod body 11. It is designed to be fixed in place. Conversely, when the fixing means 13 is removed from the connecting rod main body 11, the connecting rod main body 1 is removed.
The slide movement of the slide member 12 with respect to 1 is free.

[0011] As shown in FIG.
A pair of gripping parts 14 for gripping and fixing the optical cables 2a and 2b are arranged on the slide member 12 separately. The gripping parts 14 and 14 are fixed to the longitudinal ends of the connecting rod body 11 and the slide member 12, respectively, so as to be separated from both ends in the longitudinal direction of the connecting rod 4.

As shown in FIGS. 1 (a) and 1 (b), a grip component 14 fixed to the connecting rod main body 11 includes an I-shaped grip component main body 15 fixed on the connecting rod main body 11 in an upright state. And a plurality of pairs of claw members 17a, 17a, 17b, 17b which are screwed to a flange 16 protruding from the grip component body 15 and grip and fix the optical cables 2a, 2b from opposite sides. Claw members 17a, 17a, 17b, 1
7b has claws that cut into the outer skin of the optical cables 2a, 2b, so that the optical cables 2a, 2b can be firmly held and fixed. In addition, each grip component body 15 is fixed to the other end 11b of the connecting rod facing the one end 11a of the connecting rod main body by a screw 18.

The gripping component 14 on the slide member 12 side has the same configuration as the gripping component 14 on the connecting rod main body 11, and the gripping component 1 furthest from the one end 11a of the connecting rod main body.
4 is fixed by a screw 18 at the longitudinal end.
A tension member fixing part 19 for holding and fixing the tension member 10 exposed from the optical cable 2a having the larger diameter is fixed to the connecting rod main body 11 and the slide member 12 near each gripping part 14. In light closure 1,
A pair of optical cables 2a, 2
By fixing “a” with the gripping component 14 and the tension member fixing component 19, the two optical cables 2 a and 2 a are retained via the connecting rod 4.

The support 5 is fixed on the connecting rod body 11 and does not follow the slide member 12. The support 5 is a frame as a whole, and the optical cables 2a and 2b can be inserted therein.

The tray 6 stores optical connection portions (not shown) of the optical fibers 7 drawn out of the optical cables 2a and 2b and extra connection lengths, respectively. The optical fiber 7 drawn out from the optical cables 2a and 2b may be cut in advance before laying the optical cables 2a and 2b, or may be taken out from the optical cables 2a and 2b after attaching the connecting rod 4 to the optical cables 2a and 2b. And both may be mixed.

Next, the function and effect of the optical closure 1 will be described. According to the optical closure 1, when the connecting rod body 11 and the slide member 12 are relatively slid, the overall length of the connecting rod 4 expands and contracts, and as shown in FIG. The separation distance between the member fixing parts 19, 19 can be changed.

Next, a post-branching operation (branching method) of the optical cable 2b using the optical closure 1 will be described. First, the closure sleeve 3 is removed from the assembled optical closure 1. At this time, as shown by a solid line in FIG.
The connecting rod 4 is in an extended state.

Next, as shown by a two-dot chain line in FIG. 3, the length of the connecting rod 4 is reduced by sliding by increasing the overlapping dimension of the connecting rod body 11 and the slide member 12 to reduce the length of the optical cable. 2b is drawn to the vicinity of the support 5 to form a curved portion 21 and pulled out of the optical closure 1 (outside of the support 5), and then the connecting means 11 is operated by operating the fixing means 13 (see FIG. 2). And the slide member 12 are fixed to restrict the variation of the length of the connecting rod 4. Thus, the drawn state of the optical cable 2 b is maintained by the connecting rod 4. Then, the optical fiber 7 is taken out from the curved portion 21 of the optical cable 2b. Here, the cutting of the slot and the tension member of the optical cable 2b is not performed.

The drawing distance of the optical cable 2b is determined by the connecting rod 4
It is easy to set the optical cable 2b to an appropriate range by the shortened dimension, and it is possible to prevent the optical cable 2b from being excessively bent more than necessary. Moreover, the optical cable 2b
Of the optical cable 2 to the gripping parts 14 and 14
b is held and fixed, so that the target position (branch position 2
0), it is possible to reliably form the curved portion, and it is possible to prevent the inconvenience that bending stress concentrates on the local portion of the optical cable 2b. Therefore, in this optical closure 1, by shortening the connecting rod 4 by an appropriate distance, the optical fiber 7
Work such as taking out of the data can be proceeded without substantially affecting the actual line. In addition, it is preferable that the relative position of the connecting rod body 11 and the slide member 12 can be recognized by the scales, marks, stoppers, and the like of the connecting rod 4, whereby an appropriate drawing distance of the optical cable 2b can be reliably obtained.

During the work of taking out the optical fiber 7, etc., a pair of holding parts 14, 14 holding and fixing the optical cable 2b are held.
Since the pulling state of the optical cable 2b is maintained without changing the separation distance therebetween, the work such as taking out the optical fiber 7 can be efficiently performed by one worker. Also, the connection rod 4 maintains the drawn state of the optical cable 2b, and what the operator does not perform is the optical cable 2b.
It is easy for an operator to pay attention to the optical fiber 7 taken out of the optical fiber 7, and the optical characteristics of the optical fiber 7 can be reliably maintained.

When the work of taking out the optical fiber 7 is completed by the two optical cables 2b, the connecting means 11 is operated by operating the fixing means 13 so that the connecting rod body 11 and the sliding member 12 can be slid (see FIG. 2). The length of the rod 4 is adjusted to a length suitable for storage in the closure sleeve 3, and the fixing means 13 is operated again to regulate a variation in the length of the connecting rod 4.
As a result, the optical cable 2b returns to the original laid state, and the branch position 20 is stored in a state of being drawn back into the closure sleeve 3. Therefore, the closure sleeve 3
It is not necessary to secure a space for accommodating the curved portion 21 inside.

Next, the optical cable 2b or the optical cable 2
A connection work between the optical fibers 7 drawn out from a is performed, and finally, the closure sleeve 3 is attached to assemble the optical closure 1. The optical connection between the optical fibers 7 and the extra connection length are stored in the tray 6. The optical cable 2
The operation of connecting the optical cables 2a with each other by the connecting rod 4 may be performed before or after the branching operation of the optical cable 2b.

Therefore, according to the optical closure 1, since the connecting rod 4 can be extended and contracted, one person can perform a pulling operation required for the rear branching operation of the optical cable 2b which does not cut the slot or the tension member. It can be performed more efficiently by the operator. Further, since the connecting rod 4 is fixed to the target length by the fixing means 13, the drawn state of the optical cable 2b can be maintained, so that the work such as taking out the optical fiber 7 can be efficiently performed by one worker. it can. As a result, the entire rear branching operation of the optical cable 2b can be performed by one worker, and the cost can be significantly reduced.

In this optical closure 1, since the connecting rod 4 is extendable, the re-branching operation can be performed efficiently. That is, in the re-branching operation of the optical cable 2b,
After the closure sleeve 3 is removed, the connecting rod 4 is once contracted to pull the optical cable 2b in the same manner as in the first post-branching operation. At this time, the pulling operation is performed by gripping the optical cable 2b on both sides of the branch position 20. 14, 14 can be performed while holding and fixing,
There is no need to remove the optical cable 2b from 4,14. After the re-branch is completed, simply return the connecting rod 4 to its original size.
The optical closure 1 can be reassembled.

The optical closure 1 can also be applied to a post-branch involving cutting of a slot or a tension member. One person can perform operations such as cutting the slot and cutting the tension member 10 while maintaining the bending of the optical cable 2b. Can be performed more efficiently.

Next, an optical closure 30 according to a second embodiment of the present invention will be described with reference to FIGS. The optical closure 30 differs from the optical closure 1 of the first embodiment only in that a tray 6 is stacked on the extra-length storage box 31 by using an extra-length storage box 31 instead of the support table 5. In the drawings, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description is simplified.

As shown in FIGS. 4A and 4B, the extra length storage box 31 is fixed to the connecting rod body 11 and is supported at a substantially central portion of the connecting rod 4 in the longitudinal direction. The optical closure 30 is used when performing a post-branch operation of the optical cable 2b including the operation of cutting the slot and the tension member 10.
That is, when the two optical cables 2b are branched back, the optical cable 2b is gripped and fixed to the grip components 14, 14, and then the length of the connecting rod 4 is reduced to draw the optical cable 2b. Thereby, the work of cutting the slot and the tension member 10 and the work of taking out the optical fiber 7 can be efficiently performed by one worker. Also, by simply adjusting the length of the connecting rod 4, the closure sleeve 3 can be mounted while holding and fixing the optical cable 2b to the holding parts 14, 14, so that the optical closure 30 can be easily assembled. The extra length of the optical fiber to be drawn through the optical cable 2b without branching is the extra length storage box 31.
Housed inside.

According to the light closure 30, the tray 6
Is not required, and a large number of trays 6 can be housed at a high density, and as a result, the number of optical connection parts and the like that can be housed is increased. Thus, it is possible to cope with the post-branching operation of a multi-core optical cable. This light closure 30
It goes without saying that high re-branching workability can be obtained also in the above.

The configuration of the present invention is not limited to the above embodiment, and the following changes can be made. Changing the configuration of the connecting rod. This will be described in some detail. For example, the connecting rod 35 shown in FIG. 5 is provided at both ends in the longitudinal direction of the rod-shaped connecting rod main body 32.
A slide member 33 having fixing means 34 (thumb screw) is slidably attached to each.
As for the connecting rod 35, by selecting holes drilled at a plurality of positions in the longitudinal direction of the connecting rod main body 32 and fixing the fixing means 34, the total length is set. Is the same as

The connecting rod 40 shown in FIGS. 6 (a), 6 (b) and 6 (c) is provided so as to be slidable with respect to the connecting rod main body 41 in the form of a rod. A rod-shaped slide member 42 whose projection dimension from the longitudinal end of the main body 41 is variable, a handle 44 pivotally attached to a support shaft 43 provided on the connecting rod main body 41, and a connecting rod main body 41. On the other hand, fixing means 45 (screw) for fixing the slide member 42 is provided. The screw as the fixing means 45 is screwed to the slide member 42 via a long groove 46 opened in the connecting rod main body 41. When the fixing force is loosened, the sliding of the slide member 42 with respect to the connecting rod main body 41 is permitted. When fixed, the sliding of the slide member 42 with respect to the connecting rod main body 41 is restricted, and the entire length of the connecting rod 40 is fixed. The handle 44 operates a lever portion 44a protruding from the support shaft 43 to the side of the connecting rod 40 (a direction perpendicular to the longitudinal direction) to rotate about the support shaft 43. The handle tip 44b protruding to the opposite side via the support shaft 43 with respect to
The lever 44a rotates in a direction opposite to that of the lever 44a. Since the pin 42a protruding from the slide member 42 is inserted into the engagement groove 44c formed in the handle tip 44b, the handle 4 is operated by operating the lever 44a.
When the handle 4 is rotated and the handle tip 44b is rotated, the slide member 42 is guided by the connection rod body 41 while the handle tip 44b moves.
Slide to move. Since the pin 42a is penetrated by the long groove 47 formed in the connecting rod body 41, the rotation range of the handle 44 is set by the movable range of the pin 42a in the long groove 47. A slide movement range t of the slide member 42 with respect to the connecting rod body 41 is set.

According to the connecting rod 40, the lever portion 44a
Can be easily expanded / contracted (to change the total length), for example, two optical cables 2a, 2a
Operations such as drawing (see FIG. 3) and forming a curved portion on the optical cable 2b can be easily performed. Therefore,
The handle 44 functions as the length changing means of the connecting rod 40, and even if the tension acting on the optical cable 2b before cutting or the tensile force between the two optical cables 2a, 2a acts on the connecting rod 40, The length of 40 can be easily adjusted. Pin 4
If the protrusion of the lever portion 44a from the support shaft 43 is increased with respect to the distance from the engagement position between the engagement groove 2c and the engagement groove 44c to the support shaft 43, the handle 44 functions as a lever, so that the optical cables 2a, 2a Even if the tensile force acting between them and the tension acting on the optical cable 2b are large, operations such as drawing the optical cable and forming a curved portion can be performed efficiently with little labor.

The connecting rod body 41 and the slide member 42
Needless to say, the fixing means for fixing the gap between them and the shape of the handle can be appropriately changed. Also, for example, if the handle 44 is detachable from the support shaft 43 and the pin 42a, the support shaft 43 can be changed only when the length of the connecting rod 40 is changed.
The handle 44 can be attached to the pin 42a, and the handle 44 can be removed except during work. The pivotal position of the handle 44 with respect to the support shaft 43 can be changed.
If a configuration is adopted in which the engagement groove 44c can be extracted from the handle 44a, the handle 44 may be connected to the support shaft 4 except during operation.
3, the engagement groove 44c is pulled out from the pin 42a, the engagement is released, and the handle 44 is rotated so as to be substantially parallel to the connecting rod 40.
4a can be stored compactly without projecting. In any of the configurations, the storage space of the handle 44 is small or unnecessary except during the work, so that the internal space of the optical closure can be effectively used, the size can be reduced, and the mounting density of optical components and the like can be improved. This contributes to an increase in the number of supported hearts.

A scale, a mark or the like for indicating a relative position between the connecting rod body 11 and the slide member 12 is provided. A slide member having a similar function is used instead of the slide member 12. Instead of the fixing means 13, a fixing means having a similar function is used. Instead of the illustrated optical closures 1 and 30, the present invention is applied to an optical closure having a different configuration. Apply SZ cable as optical cable.

[0034]

As described above , according to the present invention ,
It has the following excellent effects. (A) Since the connecting rod can be expanded and contracted while holding the optical cable on the gripping part, the optical cable can be efficiently drawn without unnecessary bending, and the optical cable can be rearwardly moved without substantially affecting the actual line. Can branch. (B) By expanding and contracting the connecting rod while holding and fixing the optical cable to the gripping component, the work of drawing the optical cable to the branch position can be performed efficiently, and the rear branch and re-branch can be performed.
Workability can be improved. (C) By restricting the relative sliding movement between the connecting rod body and the slide member by the fixing means, the drawn state of the optical cable can be maintained, and the operator need not directly maintain the drawn state of the optical cable. So
The work of taking out an optical fiber or the like from the optical cable can be performed by one worker. (D) According to (c), the number of workers can be reduced, and the cost can be reduced. (E) At the center in the longitudinal direction of the connecting rod, the optical cable
Of the optical connection between the optical fibers
A plurality of trays to be stored are stacked,
Even after storing the optical connection part and extra connection length in the tray,
While holding the optical cable to the holding part,
With the configuration in which the connecting rod is extendable, the re-branching workability of the optical cable can be improved.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a first embodiment of an optical closure according to the present invention, wherein FIG. 1A is a front sectional view, and FIG.
FIG. 3 is a sectional view taken along line A of FIG.

FIG. 2 is a plan view showing a connecting rod of the optical closure of FIG.

FIG. 3 is a front sectional view showing the operation of the optical closure of FIG. 1;

FIGS. 4A and 4B are diagrams showing a second embodiment of the optical closure of the present invention, wherein FIG. 4A is a front sectional view, and FIG.
FIG. 3 is a cross-sectional view taken along line B.

FIG. 5 is a plan view showing another embodiment of a connecting rod.

6A and 6B are diagrams showing a configuration provided with a handle functioning as a length changing means of the connecting rod as another form of the connecting rod, wherein FIG. 6A is a plan view showing an expanded state, and FIG. And (c) is a front view showing a reduced state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical closure, 2a ... Optical cable, 2b ... Optical cable, 3 ... Closure sleeve, 4 ... Connecting rod, 6 ... Tray
ー 、 7 ・ ・ ・ Optical fiber (multi-core optical fiber tape core) 、 1
Reference numeral 0: tension member, 11: connecting rod main body, 12: sliding member, 13: fixing means (thumb screw), 14: gripping part, 21: curved portion, 30: optical closure, 32: connecting rod main body, 33: sliding member , 34 fixing means (thumb screws), 35 connecting rods, 40 connecting rods, 41 connecting rod body, 42 sliding member, 45 fixing means (screw).

Continuing from the front page (72) Inventor Nobuyuki Hanya 1440, Musaki, Sakura-shi, Chiba Prefecture Inside Fujikura Sakura Plant (72) Inventor Mitsuo Nakajima 1 Higashi-Shinmachi, Higashi-ku, Nagoya-shi, Aichi Chubu Electric Power Company (72) Inventor Shinichi Tanaka 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Chubu Electric Power Co., Inc. (72) Inventor Toshinori Makino 1-Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Chubu Electric Power Co., Ltd. (56) References JP-A-1-310305 (JP, A) JP-A-8-334631 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 6/00 G02B 6/24 G02B 6/46 H02G 15/10

Claims (1)

(57) [Claims] 1. A closure sleeve (3) detachably mounted in the middle of an optical cable (2a, 2b), and an elongated connecting rod (4, 35, 35) housed in the closure sleeve along the optical cable. 40), wherein the connecting rod is an elongated connecting rod body (11, 32, 4).
(1) a slide member (1) which is slidably attached to the connecting rod body along its longitudinal direction and has a variable projection size from the longitudinal end of the connecting rod body.
2, 33, 42) and fixing means (1) for switching between fixing / unfixing of the slide member with respect to the connecting rod body.
3, 34, 45) and a pair of gripping parts (14, 14) which are distributed and installed on the connecting rod main body and the slide member so as to be separated from both ends in the longitudinal direction of the connecting rod and grip and fix the optical cable respectively. A plurality of trays (6) for storing an optical connection portion between optical fibers (7) drawn out from the optical cable and an extra connection length are laminated at a central portion in a longitudinal direction of the connecting rod. The optical closure (1, 30), wherein the connecting rod is extendable while holding the optical cable on the holding component even after the optical connection portion between the fibers and the extra connection length are stored in the tray. .