KR200380997Y1 - apparatus for fixing optical cable in the optical cable terminal box - Google Patents

Abstract

The present invention relates to an optical cable connection terminal, and more particularly, to an optical cable fixing device of an optical cable connection terminal that can be applied to a general purpose optical fiber having a variety of diameters.

To this end, the present invention, the holder 210 which is disposed at each optical cable inlet of the terminal box to form a space between the respective optical cable inlet; It is disposed in each space, consisting of at least two blocks, at least two fixing grooves having different sizes are formed on the outer surface of each block, the fixing groove of each block according to the outer diameter of the optical cable to be inserted Block assembly 220 is assembled to combine to form an optical cable insertion hole; In addition, the optical cable fixing device of the optical cable connection terminal comprising a fastening member 230 to fasten the holder to the terminal box, the block assembly to press and fix the optical cable.

Description

Apparatus for fixing optical cable in the optical cable terminal box}

The present invention relates to an optical cable connection terminal, and more particularly, to an optical cable connection terminal that can be applied to a general purpose optical cable having a variety of diameters.

In general, an optical cable is a cable for transmitting an optical signal, and unlike a cable for transmitting an electrical signal, a large amount of information can be quickly transmitted without loss. Therefore, the optical cable is mainly used for near and long distance communication. Recently, with the advent of the information age, the demand for optical cables is rapidly spreading, and along with the development of optical cable related technologies.

When the optical cable is manufactured by the manufacturer, its length is usually limited to a certain length (about 2 km). Therefore, the middle of the optical cable is connected using the optical cable connection terminal. In addition, it is possible to branch as many optical cables as necessary at the optical cable connection terminal.

On the other hand, the optical cable installer determines in advance how much demand will increase in a given region in the future for a certain period of time, and installs various facilities such as the amount of optical cable laid and other optical cable connection terminals according to the determination.

Such a conventional optical cable connection terminal will be described.

1 is a top view showing the configuration of a conventional optical cable connection terminal, Figure 2 is an exploded perspective view showing the internal configuration of the optical cable connection terminal of Figure 1, Figure 3 is a perspective view showing an optical cable inserted into the optical cable connection terminal of FIG. 4 is a side view illustrating an exploded structure of the optical cable fixing device of FIG. 2.

1 and 2, a conventional optical cable connection terminal will be described.

The optical cable connection terminal is a device that connects the ends of a predetermined number of optical cables 60 on both sides or branches a predetermined portion of the optical cable in different directions.

The optical cable connection terminal includes a terminal box 10 having a concave part so that the optical cable is wound therein, an optical cable fixing device 20 which is installed at both sides of the terminal box to fix the ends of the optical cable 60 inserted therein, and the terminal box. At least one recessed portion is provided with a tray 40 to protect the connection portion of the optical cable, and a cover 50 is detachably installed to cover the upper end of the terminal box.

The cover 50 is detachably frosted as fastened to the terminal box as a fixing bolt 51, the gap between the terminal box 10 and the cover 50 is fitted to the upper edge of the terminal box sealing member 30 is installed It is tightly sealed by). The terminal box 10 is preferably formed of an insulating material that can withstand a constant external force and impact when buried underground, the terminal box is also determined along with the optical cable inlet 11 to which the optical cable is connected according to the capacity of the recess.

The sealing member 30 functions to prevent moisture or water from flowing into the terminal box 10. The sealing member is made of a material such as silicon or rubber.

In addition, each tray installed in the recess of the terminal box 10 is a stacked state, the lowermost tray is directly hinged to the terminal box, and the remaining trays are hinged to another tray directly below. At this time. The larger the capacity of the optical cable has a structure in which a plurality of trays are stacked. The tray 40 and the terminal box 10 is preferably formed with a hinge portion 41 so that each tray 40 is opened and closed while rotating around the hinge portion 41.

The tray 40 is formed with a structure capable of winding the optical fiber cluster 62 in a streamlined form and a structure in which the optical fiber cluster wound in a streamlined form can be seated. That is, inlet grooves 42 are formed at both sides of the tray 40 so that the optical fiber cluster 62 is introduced therein, and a plurality of slots 43 having a linear groove shape are formed in predetermined portions of the trays. Each of the slots 43 is fitted with an adapter portion, which is a portion to which the optical fiber cluster 62 is connected, is fixed.

Referring to FIG. 3, the optical cable 60 has a steel wire 63 and a plurality of optical fiber clusters 62 inside the outer shell 61. Here, the optical fiber cluster refers to an optical fiber of a predetermined strand as a unit. 3 shows a state in which the outer shell of the optical cable is peeled off so that the optical cable can be fixed to the optical cable fixing device disposed at the inlet of the terminal box.

The optical cable fixing device 20 is installed at each of the inlets 11 of the terminal box to fix the end of the optical cable 60. The optical cable fixing device 20 performs a function of preventing the optical cable from falling out even if a constant external force is applied to the optical cable 40.

4, the optical cable fixing device 20 is composed of a lower support 21, an upper support 22, a lower diameter adjusting piece 23, an upper diameter adjusting piece 24 and an iron core 25 and the like. do.

The lower support 21 is fixed to the optical cable inlet 11 of the terminal box. The lower diameter adjusting piece 23 having a predetermined curvature is disposed above the lower support so as to support the optical cable 60.

The iron core 25 is formed in a substantially "U" shape and a screw thread is formed at both ends thereof to fasten the nut 26. The center of the iron core 25 is fixed to the inlet 11 of the terminal box, both ends thereof are installed so as to project a predetermined height from both sides of the lower support 21. In addition, the iron core 25 is installed so that both sides pass through both sides of the lower support 21 also serves to stably support the lower support.

The upper support 22 is formed so that the lower surface portion has the same curvature as the lower support. In addition, fastening holes are formed at both sides of the upper support 22 so that both ends of the iron core 25 can be inserted therein.

The upper and lower diameter adjusting pieces 23 and 24 each having a predetermined radius of curvature are detachably installed at the upper surface portion of the lower support and the lower surface portion of the upper support. That is, protrusions are formed on the outer surfaces of each of the diameter adjusting pieces 23 and 24, and grooves are formed in the upper and lower support members 21 and 22 to correspond to the protrusions. Therefore, the diameter adjusting pieces (23, 24) can be detachably installed on the upper / lower support (21, 22). Therefore, the nut 26 is tightened after installing the diameter adjusting pieces 23 and 24 having the inner side of the same radius of curvature as the outer diameter of the optical cable 60 to be inserted into the upper and lower surfaces of the upper and lower support members 21 and 22. When one end of the optical cable 60 is fixed to the fixing device 20.

The process of connecting the optical cable to the optical cable connection terminal configured as described above is as follows.

In order to connect the optical cable 60, the outer shell 61 is cut by a predetermined length from the end portions of the two optical cables facing each other. When the outer shell is peeled off, the optical fiber cluster 62 inserted into the outer diameter portion of the inner shell is exposed to the outside. Subsequently, the inner covering is cut while leaving a predetermined length, and the steel wire 63 is cut while leaving longer than the remaining length of the inner covering. The insulation tape is then wound around the exposed portion 22 of the inner covering body 22 several times.

The end of the optical cable 20 manufactured as described above is fixed to the optical cable fixing device 20 of the optical cable inlet 11. More specifically, the lower diameter adjusting piece 23 having the same radius of curvature as the outer diameter of the optical cable 20 is fastened to the lower support 21, and the end of the optical cable 60 is positioned on the lower support 21. . Subsequently, the upper support 22 is fastened to the upper diameter adjusting piece 24 having the inner side of the same radius of curvature, and then the upper support 22 is fitted to both ends of the iron core 25. Subsequently, as the nuts 26 are fastened to both ends of the iron core 25, the lower support 21 and the upper support 22 are pressed to stably fix the optical cable 60.

The optical cable fixing device 20 is installed by replacing only the upper and lower diameter adjusting pieces (23, 24), it is possible to fix the optical cable 60 having a variety of diameters.

Subsequently, the group of optical fiber clusters 62 is wound around the inside of the terminal box 10 in a circular shape, and the optical fiber clusters 62 are inserted into the inlet grooves 42 of the tray 40, thereby forming the optical fiber clusters in the tray 40. (62) is drawn in. The optical fiber cluster 62 introduced into the tray is wound around the tray 40 as shown in FIG. 2, and then the corresponding optical fibers are connected at both ends of the corresponding optical fiber cluster by the optical fiber connection method. The adapter portion thus connected is fixed to the corresponding slot 43 of the tray 40. After the cover 50 of the terminal box is closed, the fixing bolt 51 is fastened to complete the connection or branching of the optical cable 60.

However, the conventional optical cable fixing device of the optical cable connection terminal has the following problems.

First, since the diameter adjusting piece should be manufactured in various sizes according to the outer diameter of the optical cable, the production cost of the fixing device can be increased. In addition, at the installation site, it is necessary to secure various diameter adjusting pieces suitable for the diameter of the optical cable.

Second, when the size of the optical cable drawn into one side of the terminal box and the optical cable drawn out or branched to the other side is different, the diameter adjusting piece must be replaced every time and there is a problem in that it cannot flexibly cope with such a change.

In order to solve the above-mentioned problems, an object of the present invention is to provide an optical cable connection terminal that can be used in general for optical cables of various diameters.

In order to achieve the above object, according to one aspect of the present invention, the holder is disposed at each optical cable inlet of the terminal box, respectively, to form a space between the optical cable inlet; It is disposed in each space, consisting of at least two blocks, at least two fixing grooves having different sizes are formed on the outer surface of each block, the fixing groove of each block according to the outer diameter of the optical cable to be inserted Block assembly is assembled to combine to form an optical cable insertion hole; In addition, the optical cable fixing device of the optical cable connection terminal comprising a fastening member for fastening the holder to the terminal box, the block assembly to press and fix the optical cable.

The fixing grooves are preferably formed to have different curvatures.

In this case, half of the blocks of the block assembly are inserted into each of the optical cable inlets, and the other half of the blocks of the block assembly is inserted into the respective holders.

The optical cable is inserted only in the optical cable insertion hole formed in a portion where the upper end of the blocks inserted into each inlet and the lower end of the blocks inserted into the respective holders are in contact with each other.

It is preferable that fixing protrusions protrude from each fixing groove of each block.

In addition, it is preferable that the separation prevention part is formed in each of the holders so that the inserted blocks are not caught.

In addition, it is preferable that a sealing member of a flexible material is further installed at each of the optical cable inlets so that the optical cable is inserted and the gap is sealed.

Therefore, according to the present invention, the optical cable fixing device can be used in general for optical cables of various diameters.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object.

5, an embodiment of an optical cable fixing device of an optical cable connection terminal according to the present invention will be described. In FIG. 5, the illustration of the cover and the tray is omitted.

At least one optical cable inlet 111 is formed at both sides of the terminal box 100, and the optical cable fixing device 200 is installed at each of the optical cable inlet 111. In addition, the sealing member 120 is installed along the edge of the terminal box.

The optical cable fixing device 200 includes a holder 210 corresponding to each of the optical cable entry grooves 111 of the terminal box 100, and an optical cable entry groove 111 and the holder 210 of the terminal box 100. Disposed in the space formed by the at least two blocks, and at least two fixing grooves 221 (see FIG. 6) having different sizes are formed on the outer surface of each block, and the optical cable to be inserted The block assembly 220 is assembled to combine the fixing grooves 221 of the respective blocks according to the outer diameter of the block 60 to form an optical cable insertion hole, and the block assemblies 220 are fastened to the terminal boxes by the holders. 60 is configured to include a fastening member 230 to be fixed by pressing.

When the outer shell of the optical cable 60 is circular, the fixing groove 221 of the block assembly 220 has a different curvature, when the outer shell of the optical cable is not circular, the fixing groove 221 Has a shape corresponding to the outer circumferential surface of the envelope body.

In this case, it is preferable that half of the blocks of the block assembly 220 are inserted into each optical cable inlet 111, and the other half of the blocks of the block assembly is inserted into each holder 210. In this case, the optical cable may be inserted only in the optical cable insertion hole formed at a portion where the upper end of the blocks inserted into the inlet 111 and the lower end of the blocks inserted into the holder 210 are in contact with each other. Of course, it is also understood that the optical cable insertion hole may be arranged in another part.

Each block described above preferably has a curvature display unit 222 (see FIG. 6) to recognize the size of the fixing groove 221.

In addition, the optical cable inlet 111 is preferably provided with a sealing member 240 made of a flexible rubber or synthetic resin material to insert the optical cable 60 and to seal the gap. At this time, the sealing member 240 is disposed inside the optical cable fixing device 200, the sealing member 120 is disposed closely below the sealing member 240. The sealing member is formed with at least one insertion tube portion 241 to insert the end of the optical cable 60. The insertion pipe portion 241 is a structure that can be inserted into the optical cable 60 after cutting with a cutter.

In addition, the guide 112 is formed on the inner surface of the edge of the terminal box 100 to correspond to each inlet. At this time, the guide 112 is disposed on both sides of each inlet 111. In addition, the guide 112 is more preferably provided with a core wire fixing member 130 to be moved up and down. This is to stably fix the core wire, thereby preventing the optical cable from inclining about the guide when an external force is applied to the optical cable 60.

6 and 7, an example of each block assembly will be described in detail.

Each block assembly 220 is composed of eight blocks. In this case, four blocks are inserted into each optical cable inlet 111, and the remaining four blocks are inserted into each holder 210.

Fixing grooves 221 having different curvatures are formed on four surfaces of each block. Each of the fixing grooves 221 has a semicircular cross section. The curvature of each of the fixing grooves 221 is preferably determined within a predetermined range based on the diameter of the standardized outer circumferential surface of the optical cable 60. In addition, it is more preferable that the curvature display unit 222 is formed on one surface where the fixing groove 221 of each block is not formed so that the size of each fixing groove can be recognized. Preferably, the curvature display unit 222 displays the diameter of the fixing groove 221. Therefore, the operator can visually select the curvature display unit 222 of the fixing grooves to select the fixing groove 221 of the size corresponding to the optical cable.

In addition, the fixing grooves are preferably formed in a 0.3 ~ 0.7mm size interval.

The above-described optical cable insertion holes of the block assembly 220 theoretically have a combination of [{8C2 (4 × 4)} × 6C4 × (4 × 4)] = 107520 pieces. Here, nCr = n! / {(N-r)! × r!}, And n! = N × (n−1) × (n−2) ... × 1. However, since the insertion groove is formed by combining the fixing groove having the curvature of substantially the same size as the size of the optical cable and the fixing groove having the curvature which is one step larger, the combination hole has substantially about 64 combinations. Therefore, it is possible to apply to the optical cable of various diameters simply by changing the combination of the fixing grooves.

Referring to Figures 8 and 9, another example of the block assembly will be described in detail.

Each block assembly 320 is composed of two blocks. In this case, one block is inserted into each optical cable inlet 111, and the other one block is inserted into each holder 210.

Fixing grooves 321 having different curvatures are formed on four surfaces of each block. Each of the fixing grooves has a substantially semicircular cross section. The curvature of each fixing groove is preferably determined within a predetermined range based on the diameter of the standardized outer peripheral surface of the optical cable. In addition, it is more preferable that the curvature display unit 322 is formed on one surface where the fixing groove of each block is not formed to recognize the size of each fixing groove.

In addition, the fixing grooves are preferably formed in a 0.3 ~ 0.7mm size interval.

The optical cable insertion holes of the block assembly described above theoretically have a combination of {8C4 × (4 × 4)} = 448. However, since an insertion hole is formed by combining a fixing groove having a curvature having substantially the same curvature as the size of the optical cable and a fixing groove having a curvature that is one step larger, there are substantially eight combinations.

The block assembly 320 has a smaller number of combinations than the block assembly 220 composed of the eight blocks described above, but the number of the fixing grooves is small, so that the block assembly 320 can be easily and quickly performed.

Since the above-described block assembly can be changed into various forms, the rest of the description will be omitted.

In the block assemblies 220 and 320 of FIGS. 8 and 9, at least one fixing protrusion 221a and 321a may protrude from the fixing grooves 221 and 321 of each block, and the holder 210 may include the fastening member 230. In the pressurized state), the fixing projections 221a and 321a dig the outer shell of the optical cable 60 so that the optical cable acts as a pulling force in the longitudinal direction or a rotational force in the circumferential direction. This is to prevent the axial sliding or rotation in the circumferential direction.

In addition, referring to Figure 10, it is preferable that the separation prevention portion 211 is formed in each holder 210 so that the inserted blocks are not caught. At this time, the departure prevention portion 211 is formed by extending in the lower side from the front and rear of the holder and the projection (211a) inward. The departure prevention part 211 presses the blocks inward as shown by the arrow of FIG. 11. In addition, fastening holes 212 are formed at both sides of each holder 210 so that the fastening members 230 may be inserted as shown in FIGS. 6 and 8.

Referring to the installation process of the optical cable fixing device of the optical cable connection terminal according to the present invention having the above configuration as follows. Hereinafter, a description will be given based on a block assembly consisting of eight blocks.

The end of the insertion tube 241 of the sealing member 240 is cut with a cutter, and then the end of the optical cable 60 is inserted into the insertion tube 241. At this time, since the sealing member 240 is made of a flexible material, the insertion pipe part 241 is extended to seal the gap with the outer peripheral surface of the optical cable 60. Then, the outer sheath of the optical cable end is peeled off as shown in FIG.

Subsequently, four blocks are inserted into the inlet 111 of the terminal box and the remaining four blocks are inserted into the holder 210. At this time, the departure prevention part 211 of the holder by pressing the lower two blocks inward, so that the blocks from the holder 210 does not fall out.

The fixing groove 221 disposed on the upper surface of the terminal box inlet 1110 and the fixing groove 221 disposed on the lower surface of the holder 210 form an optical cable insertion hole, which is larger than the diameter of the optical cable 60. Slightly smaller size

The end of the optical cable is inserted into the optical cable insertion hole and then the fastening member 230 is fastened. Since the fastening member 230 presses the holder 210 and the block assembly 220, the optical cable is fixed by the block assembly.

At this time, the fixing projections 221a of the fixing grooves 221 dig into the outer shell of the optical cable 60 and pressurize it. Therefore, the optical cable is prevented from moving or moving in the longitudinal direction or the circumferential direction by the external force.

The effects of the optical cable fixing device of the optical cable connection terminal according to the present invention described above are as follows.

First, according to the present invention, the optical cable fixing device may be appropriately combined with the fixing groove of the block, there is an effect that can be universally applied to optical cables of various diameters with only one set of block assemblies. In addition, since there is no need to replace the optical cable fixing device during the optical cable connection or branching work, the working time is shortened and the work efficiency is increased.

Secondly, according to the present invention, the fixing protrusion of the block assembly has an effect of preventing the optical cable from moving in the longitudinal direction or the circumferential direction even if an external force acts in the longitudinal direction or the circumferential direction of the optical cable.

1 is a top view showing the configuration of a conventional optical cable connection terminal.

2 is an exploded perspective view showing the internal configuration of the optical cable connection terminal of FIG.

3 is a perspective view showing an optical cable inserted into the optical cable connection terminal of FIG.

Figure 4 is a side view showing an exploded structure of the optical cable fixing device of FIG.

5 is an exploded perspective view showing the configuration of an optical cable connection terminal according to the present invention.

6 is an exploded perspective view showing an example of the optical cable fixing device of FIG.

Figure 7 is a side view showing the optical cable fixing device of FIG.

8 is an exploded perspective view showing another example of the optical cable fixing device of FIG.

9 is a side view showing the optical cable fixing device of FIG.

10 is a side view showing the optical cable fixing device of FIG.

11 is a side view showing the optical cable fixing device of FIG.

Explanation of symbols on the main parts of the drawings

100: terminal box 111: inlet

112: guide 120: sealing member

130: core wire fixing member 200: optical cable fixing device

210: holder 211: separation prevention part

212: fastening hole 220,320: block assembly

221,321: Fixing groove 221a, 321a: Fixing protrusion

222,322: curvature display unit 230: fastening member

240: sealing member 241: insertion tube

Claims (8)

A holder disposed at each of the optical cable inlets of the terminal box to form a space between the inlets of the respective optical cables; It is disposed in the space, consisting of at least two blocks, at least two fixing grooves having different sizes are formed on the outer surface of each block, the fixing groove of each block according to the outer diameter of the optical cable to be inserted A block assembly assembled to form an optical cable insertion hole in combination; And, And a fastening member configured to fasten the holder to the terminal box so that the block assembly presses and fixes the optical cable. The method of claim 1, And the fixing grooves are formed to have different curvatures. The method of claim 2, Half of the blocks of the block assembly are inserted into each optical cable inlet, And each other half of the blocks of the block assembly is inserted into each holder. The method of claim 3, The optical cable fixing device of the optical cable connection terminal, characterized in that the optical cable is inserted only in the optical cable insertion hole formed in the portion where the upper end of the blocks inserted into each inlet and the lower end of the blocks inserted into each holder. The method according to claim 2 or 3, Fixing protrusions are formed in the fixing groove of each block, the optical cable fixing device of the optical cable connection terminal, characterized in that formed. The method according to claim 2 or 3, Each holder is provided with an optical cable fixing terminal, characterized in that the separation prevention portion is formed so that the inserted blocks are not caught. The method of claim 1, Wherein each block has a curvature display portion to recognize the size of the fixing grooves. The method of claim 1, The optical cable fixing device of the optical cable connection terminal, characterized in that the optical cable is inserted into the optical cable inlet and the sealing member of a flexible material is further installed to seal the gap.