JP3989408B2 - Optical cable fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical cable fixing structure for fixing an optical fiber to a flat fixed base, and more particularly to an optical cable fixing structure for folding and fixing a coated wire of an optical fiber to a fixed base.
[0002]
[Prior art]
Conventionally, when an optical fiber used for communication or the like is drawn into a building from the outside, an optical fiber storage case that stores a photoelectric conversion unit that converts an optical signal into an electrical signal and stores an excess length of the optical fiber has been provided. Provided on the outer wall of the building. In this case, the optical fiber storage case is provided with an optical fiber fixing portion in the vicinity of the optical fiber drawing port. The optical fiber is provided with reinforcing wires on both sides, and these are covered with a covered wire to constitute an optical cable. The reinforcing wire is made of steel wire, reinforced plastic wire, or the like, and serves as a reinforcing material against bending of the optical cable. The covered wire is made of rubber or the like and protects the optical fiber from being directly exposed.
[0003]
For example, a structure as shown in Patent Document 1 is known as an optical fiber fixing part, which sandwiches and fixes an optical fiber by a member for fixing an optical fiber coating, and the fixing member is accommodated in an optical fiber. It is fixed to the case. The fixing member is configured as a separate component from the optical fiber storage case, and the fixing operation of the optical fiber to the fixing member can be performed without using a tool. Further, a structure as shown in Patent Document 2 is also known, which fixes an optical fiber to a fixing portion with a screw.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-133030 [Patent Document 2]
Japanese Patent Laid-Open No. 2001-201640
[Problems to be solved by the invention]
However, the conventional optical fiber fixing structure has the following problems.
In the structure shown in Patent Document 1, it is necessary to first fix the optical fiber by a fixing member. Since this fixing member is small, it is easily lost, and when it is lost at the work site, the optical fiber cannot be fixed to the optical fiber storage case.
Further, in the structure as shown in Patent Document 2, although it is not necessary to handle small parts, it is necessary to perform screwing in order to fix the optical fiber to the optical fiber storage case, and a tool for that is required. Also, tools are required to periodically check for loose screws.
[0006]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical fiber fixing structure capable of easily fixing an optical fiber to a fixed base without using small parts or tools. And
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an optical fiber fixing structure according to the present invention is an optical cable fixing structure in which reinforcing wires are arranged on both sides of an optical fiber and an optical cable formed by covering them with a covered wire is fixed to a flat fixing base. ,
The fixed base includes a cable holding unit for holding the optical cable in a straight line, a folded fixing unit for folding and holding the branched covered wire, and the coated wire in the folded direction from the folded fixing unit. A covered wire holding part that presses and holds the reinforcing wire from the side by the restoring force of the reinforcing wire ,
The folded-back portion is formed of two fixed pieces formed in a protruding shape from the fixed base, with the covered wire folded back, and the fixed pieces are the cable holding portion and the covered wire holding portion. Independently of the fixed base,
The covered wire holding portion includes a side wall standing upright from the fixed base and a holding piece protruding in the direction of the covered wire held from the upper end of the side wall, and the covered wire in the turned direction from the turned-up fixed portion is Between the said cable holding part and a covered wire holding part, it contact | abuts only to the said covered wire holding part side, It is comprised.
[0008]
Further, in the optical fiber fixing structure according to the present invention, the cable holding portion and the folded fixing portion are arranged in series in the length direction of the optical fiber, and the covered wire holding portion is centered on the cable holding portion. The optical fiber is arranged in parallel with the length direction of the optical fiber.
[0009]
Furthermore, in the optical fiber fixing structure according to the present invention, the folded-back fixing portion is provided two for each covered wire obtained by branching a protruding fixing piece at the fixing base, and the fixing piece is formed of the covered wire. The folded portion is held and fixed from both sides.
[0010]
Furthermore, the optical fiber fixing structure according to the present invention is characterized in that the cable holding portion includes a side wall standing upright from the fixing base and a holding piece protruding inward from the upper end of the side wall. ing.
[0011]
The optical fiber fixing structure according to the present invention is characterized in that the fixing base is formed in the vicinity of the lower surface of the case having a box shape, and the tip of the branched covered wire comes into contact with the lower surface of the case. ing.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, the optical fiber fixing structure according to the present invention is applied to an optical fiber storage case. FIG. 1 is a plan view of the optical fiber storage case 1 according to this embodiment in a state where the cover 3 is opened, and FIG. 2 is an assembly perspective view of the optical fiber storage case 1 according to this embodiment. FIG. 3 is a perspective view of the optical fiber storage case 1 in the present embodiment. In each of these drawings, an optical fiber storage case 1 according to the present embodiment is formed by providing a cover body 3 covering an opening of a case body 2 formed in a box shape with one side opening. . In addition, an optical fiber fixing portion 5 serving as an optical fiber fixing structure according to the present invention is formed in the vicinity of the lower surface 40 of the case body 2.
[0013]
As shown in FIG. 4, the optical cable 20 is provided with reinforcing wires 22 made of steel wire or reinforced plastic wire on both sides of the optical fiber 21, and the optical fiber 21 and the reinforcing wire 22 are covered with a covered wire 23 made of rubber or the like. It is something that covers. Since the optical fiber 21 is very thin and easy to bend, the strength against bending of the optical cable 20 can be secured by providing the reinforcing wire 22. Moreover, since the optical fiber 21 and the reinforcing wires 22 and 22 are covered with the covered wire 23, they can be handled as one cable, and can be protected without exposing the optical fiber 21.
[0014]
The optical cable 20 is drawn into a building through a utility pole or the like outdoors. In order to draw the optical cable 20 into the building from the outside, the optical cable 20 is pulled from the utility pole to the building with a certain extra length, and the extra length is provided in the optical fiber storage case 1 provided on the outer wall surface of the building as shown in FIG. Store. In the optical fiber storage case 1, the optical fiber 20 is stored in the state of only the optical fiber 21 except for the covered wire 23 and the reinforcing wire 22 of the optical cable 20. The tip of the optical fiber 21 is connected to another optical fiber 29 having a connector 24 at one end. The connector 24 is inserted into the insertion port 7 a of the photoelectric conversion unit 7 provided in the optical fiber storage case 1. The photoelectric conversion unit 7 converts the optical signal of the connected optical fiber 21 into an electrical signal and outputs the electrical signal to the output terminal 8. A coaxial cable (not shown) is connected to the output terminal 8, and the coaxial cable is drawn into the building.
[0015]
As shown in FIG. 2, the case main body 2 of the optical fiber storage case 1 has a hollow shape except that a box-shaped photoelectric conversion unit 7 is housed therein. Moreover, the inlet 6 is formed in the lower surface 40 by closing the cover body 3 like FIG. Further, the output terminal 8 from the photoelectric conversion unit 7 is provided on the lower surface 40 of the case body 2. On the other hand, the cover body 3 of the optical fiber storage case 1 is openable and closable with respect to the case main body 2 via a hinge portion 9 provided on the upper side surface of the case main body 2.
[0016]
In order to store the optical fiber 21, the storage tray 4 formed in a tray shape is provided separately from the optical fiber storage case 1, and is stored in the optical fiber storage case 1. The storage tray 4 is a fiber such as a mechanical splice (not shown) that includes an optical fiber fixing unit 5 that holds and fixes the optical cable 20 that is drawn in, a storage unit 30 that winds and fixes the optical fiber 21, and the optical fiber 21 and the optical fiber 29. A connector holding unit 32 that includes a bonding material fixing unit 31 that is bonded by a bonding material and fixes the bonding material, and further temporarily fixes a connector 24 for connecting the optical fiber 29 to the photoelectric conversion unit 7; A fiber opening 33 for connecting the optical fiber 21 to the photoelectric conversion unit 7 is provided.
[0017]
Next, the optical fiber fixing part 5 to which the optical fiber fixing structure according to the present invention is applied will be described. The optical fiber fixing part 5 shown in FIG. 5 fixes the optical cable 20 inserted from the lead-in port 6 of the case body 2. The optical fiber fixing portion 5 in the present embodiment is provided with a flat fixing base 10 on the bottom surface of the receiving tray 4 in the vicinity of the lower surface 40 of the case body 2, and a cable holding portion for fixing the optical cable 20 to the fixing base 10. 11, a folded fixing part 12 and a covered wire holding part 13 are provided, and two optical fiber fixing parts 5 are arranged. Therefore, the optical fiber storage case 1 in this embodiment can fix and store the two optical fibers 21.
[0018]
As shown in FIG. 6, the optical cable 20 inserted from the lead-in port 6 is fixed linearly to the cable holding portion 11, and the optical fiber 21 is exposed by branching the covered wire 23 into two at the tip. Here, the two covered wires 23 are branched so as to have the reinforcing wires 22 therein. The branched covered wire 23 is turned back by the turn-back fixing portion 12, and the covered wire 23 is further pressed and fixed from the side by the covered wire holding portion 13. Thus, the optical fiber fixing part 5 in this embodiment fixes the optical cable 20 by branching the covered wire 23 into two, turning it back, and fixing them.
[0019]
FIG. 7 shows a cross-sectional view of the optical fiber fixing portion 5. As shown in this figure, the cable holding portion 11 includes a side wall 11a protruding from the fixed base portion 10 in a substantially vertical direction, and a holding piece 11b protruding in the direction of the optical cable 20 held from the tip of the side wall 11a. The optical cable 20 is held and fixed in the left and right and up and down directions. The folded-back fixing portion 12 is provided with two fixing pieces 12a, 12a formed in a cylindrical protrusion shape with respect to the fixing base portion 10, respectively, with respect to the branched covered wires 23, 23, and two fixing pieces 12a, The covered wire 23 is held and fixed during 12a. Further, the covered wire 23 is folded back in the opposite direction by the fixing pieces 12a and 12a.
[0020]
The folded covered wires 23 and 23 protrude from the folded fixing portion 12 in the folded direction, and are held and fixed to the covered wire holding portions 13 and 13. The covered wire holding portion 13 includes a side wall 13a that stands upright from the fixed base 10, and a holding piece 13b that protrudes in the direction of the covered wire 23 held from the upper end of the side wall 13a. Hold and fix from the side. Here, the side wall 13a of the covered wire holding part 13 adjacent in the two optical fiber fixing parts 5 is shared, and both side surfaces of the side wall 13a are used as the covered wire holding part 13, respectively.
[0021]
The folded covered wire 23 generates a restoring force for returning to the original state, and further, when branched so as to have the reinforcing wire 22 inside the covered wire 23, a stronger restoring force for returning to the original state is provided. appear. Therefore, the covered wire holding part 13 presses the covered wire 23 by a reaction force against the restoring force of the reinforcing wire 22. As a result, the covered wire 23 folded back by the folded fixing portion 12 is firmly fixed by the covered wire holding portion 13, so that even if a force is applied to the optical cable 20, the optical fiber fixing portion 5 firmly fixes the optical cable 20. Can be kept.
[0022]
FIG. 6 shows a state where the optical cable 20 is fixed in the enlarged view of the optical fiber fixing portion 5 of FIG. As shown in this figure, the optical cable 20 protruding from the cable holding portion 11 is branched into two, and the exposed optical fiber 21 extends into the optical fiber storage case 1 as it is. The covered wire 23 branched into two is turned back by the turn-back fixing portion 12, further protrudes in the turning direction, and is pressed and held by the covered wire holding portion 13.
[0023]
The tip of the covered wire 23 comes into contact with the lower surface 40 of the case body 2. That is, the branched covered wire 23 is cut to a length that contacts the lower surface 40 of the case body 2. By making the length of the covered wire 23 in this way, it is possible to prevent the covered wire 23 from moving any further, and even if a force is applied to the optical cable 20, the optical fiber fixing portion 5 fixes the optical cable 20 more firmly. Can be kept.
[0024]
FIG. 8 is a plan view showing a state in which the optical fiber 21 is accommodated in the accommodation tray 4. When the outdoor optical cable 20 is drawn into the building, the optical fiber storage case 1 is previously attached to the outer wall of the building. The optical cable 20 to be drawn in is prepared with a certain length, and is fixed to the optical fiber fixing portion 5 of the storage tray 4. The extra length of the optical fiber 21 excluding the coating is wound around the accommodating portion 30 and accommodated. Further, the coupling portion of the optical fiber 21 and the optical fiber 29 provided with the connector 24 at one end is fixed to the binding material fixing portion 31. The optical fiber 29 provided with the connector 24 is also wound and accommodated in the accommodating portion 30, and the connector 24 is temporarily fixed to the connector holding portion 32. In this way, the storage tray 4 that fixes and stores the optical cable 20 is attached to the optical fiber storage case 1, and the connector 24 is connected to the photoelectric conversion unit 7 through the fiber opening 33. Thereby, the outdoor optical cable 20 can be connected to a building.
[0025]
Although the embodiment of the present invention has been described so far, the application of the present invention is not limited to this embodiment, and can be variously applied within the scope of the technical idea. For example, in the present embodiment, the present invention is applied to an optical fiber storage case. However, not only this, but the optical cable is held and the subsequent portions are fixed so as to remove the covering. It can be applied to anything.
[0026]
【The invention's effect】
As described above, according to the optical cable fixing structure according to the present invention, the fixing base portion is a cable holding portion that holds the optical cable as a straight line, and the covered wire that protrudes from the cable holding portion and is branched so that each includes a reinforcing wire. And a covered wire holding portion for pressing and holding the coated wire protruding in the folded direction from the folded fixing portion from the side by the restoring force of the reinforcing wire, thereby fixing the optical cable. Can be easily fixed without using small separate parts or tools. Moreover, firm fixation can be performed by the restoring force of the reinforcing wire.
[0027]
Further, according to the optical cable fixing structure of the present invention, the folding fixing portion is provided two for each covered wire obtained by branching the protruding fixing piece on the fixing base, and the fixing piece is the folded portion of the covering wire. By holding and fixing the wire from both sides, the covered wire can be easily inserted into the fixed portion, and the covered wire can be easily fixed to the folded fixing portion.
[0028]
Furthermore, according to the optical cable fixing structure according to the present invention, the cable holding portion includes the side wall standing upright from the fixing base portion and the holding piece protruding inward from the upper end of the side wall, so that the optical cable or the covered wire is left and right. And it can fix to an up-down direction and can be fixed more firmly.
[0029]
Furthermore, according to the optical cable fixing structure according to the present invention, the fixed base is formed near the lower surface of the box-shaped case, and the tip of the branched covered wire comes into contact with the lower surface of the case, thereby The covered wire fixed to the cable is disposed at a position where it does not move any further, and the optical cable can be fixed securely.
[Brief description of the drawings]
FIG. 1 is a plan view of a state in which a cover body of an optical fiber storage case in the present embodiment is opened.
FIG. 2 is an assembled perspective view of an optical fiber storage case in the present embodiment.
FIG. 3 is a perspective view of an optical fiber storage case in the present embodiment.
FIG. 4 is a perspective view of an optical fiber in the present embodiment.
FIG. 5 is an enlarged plan view of an optical fiber fixing portion of an optical fiber storage case in the present embodiment.
6 is a diagram showing a state in which the optical cable is fixed in FIG. 5. FIG.
7 is a cross-sectional view taken along the line AA in FIG.
FIG. 8 is a plan view of a state in which the optical fiber is accommodated in the accommodation tray of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical fiber storage case 2 Case main body 3 Cover body 4 Storage tray 5 Optical fiber fixing | fixed part 6 Inlet 7 Photoelectric conversion part 10 Fixed base 11 Cable holding part 11a Side wall 11b Holding piece 12 Folding fixing part 12a Fixing piece 13 Covered wire holding Portion 13a Side wall 13b Holding piece 20 Optical cable 21 Optical fiber 22 Reinforcing wire 23 Covered wire 24 Connector 29 Optical fiber 30 Housing portion 32 Connector holding portion 33 Fiber opening 40 Lower surface

Claims (5)

In an optical cable fixing structure for fixing an optical cable formed by arranging reinforcing wires on both sides of an optical fiber and covering them with a covered wire to a flat fixed base,
The fixed base includes a cable holding unit for holding the optical cable in a straight line, a folded fixing unit for folding and holding the branched covered wire, and the coated wire in the folded direction from the folded fixing unit. A covered wire holding part that presses and holds the reinforcing wire from the side by the restoring force of the reinforcing wire ,
The folded-back portion is formed of two fixed pieces formed in a protruding shape from the fixed base, with the covered wire folded back, and the fixed pieces are the cable holding portion and the covered wire holding portion. Independently of the fixed base,
The covered wire holding portion includes a side wall standing upright from the fixed base and a holding piece protruding in the direction of the covered wire held from the upper end of the side wall, and the covered wire in the turned direction from the turned-up fixed portion is An optical cable fixing structure, wherein the cable holding portion and the covered wire holding portion abut only on the covered wire holding portion side .   The cable holding part and the turn-back fixing part are arranged in series in the length direction of the optical fiber, and the covered wire holding part is arranged substantially parallel to the length direction of the optical fiber with the cable holding part as a center. The optical cable fixing structure according to claim 1, wherein:   The folded-back fixing portion is provided with two each of the covered wires branched from the protruding fixed pieces on the fixed base, and the fixed pieces hold and fix the turned-up portions of the covered wire from both sides. The optical cable fixing structure according to claim 1 or 2. The optical cable according to claim 1, wherein the cable holding portion includes a side wall standing upright from the fixed base and a holding piece protruding inwardly from an upper end of the side wall. Fixed structure.   The said fixed base is formed in the lower surface vicinity of the case which consists of a box shape, and the front-end | tip of the branched said covered wire contact | abuts to the lower surface of the said case. Optical cable fixing structure.

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