JP4306975B2 - Optical fiber cable towing terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field related to an optical fiber cable traction terminal attached to an optical fiber cable end for traction when laying an optical fiber cable including a tension member.
[0002]
[Prior art]
Conventionally, as a terminal device for pulling an optical fiber cable, for example, the one shown in FIG. 10 is known.
[0003]
The conventional optical fiber cable traction terminal 50 is also called a pooling eye. The chuck member 1 is provided with an insertion hole 11 through which a tension member of the optical fiber cable is inserted at the center of the shaft, and the chuck member 1. A sleeve 2 in which a housing chamber 21 is housed, a pooling bolt 3 screwed into the sleeve 2, an elastic member 4 for pressing the chuck member 1 against the small diameter end of the sleeve 2, the chuck member 1, and the sleeve 2. A part of the pooling bolt 3, an aluminum can 15 that covers the elastic member 4 with a gasket 17 through a gasket 17, and an eye nut 5 that is connected to the pooling bolt 3 and to which a tow rope is connected are mainly provided.
[0004]
Further, a gasket receiver 34 for supporting the gasket 17 is provided integrally with the pooling bolt 3 next to the neck portion 33. The right part of the gasket 17 in FIG. 10 is covered with an aluminum can 15, and the aluminum can 15 is an iron cap. 16 is tightened with a tightening nut 7 and fixed. In addition, after an optical fiber cable (not shown) is inserted, the outer diameter portions (for example, 151 and 152) of the aluminum can 15 are caulked at several places to form a waterproof structure. Accordingly, the aluminum can 15 is slightly longer than the crimping position 152 farthest from the eyenut 5. The eye nut 5 is screwed to the pooling bolt 3 to a position where it comes into contact with the tightening nut 7 and is secured by the split pin 6.
[0005]
Also, as another method, although not shown, a structure called a cable grip, in which a thin wire is twisted into a wire mesh shape, wrapped around the outer sheath of an optical fiber cable, and when the pulling portion is pulled, the wire mesh is firmly wound Is also used.
[0006]
[Problems to be solved by the invention]
The above-described conventional optical fiber cable traction terminal device 50 has a large number of members (11 points) and takes time to assemble. Therefore, there is a problem that the manufacturing cost becomes high. Further, since the neck 33 (forming the surface 32 for tightening the screw portion 31 and the tightening nut 7) is provided on the pooling bolt 3 and the total length becomes long, it passes through a gold wheel (guide member) for guiding traction. In the case of a gold wheel with a large turning angle, there is a problem that the optical fiber cable may be damaged by receiving a large bending force.
[0007]
Further, the threaded portion 52 that connects the pooling bolt 3 and the eyenut 5 needs to secure the strength necessary for pulling the optical fiber cable. Therefore, if the outer diameter of the threaded portion 52 is secured, the inner diameter of the ring portion is secured. Needs to be larger than the outer diameter of the threaded portion 52. As a result, as shown in FIG. 10, the ring portion 51 of the eyenut 5 becomes considerably larger than the outer diameter of the sleeve 2, which causes an increase in weight. There was also a problem.
[0008]
In addition, in the conventional cable grip of another method, the outer sheath of the optical fiber cable is damaged by the metal mesh, and the frictional force with the outer sheath is used, so if the excessive force is applied, it will come off. There is a problem.
[0009]
Recently, there has been a situation in which it is not necessary to worry about untwisting because a twisting tool that eliminates twisting of the optical fiber cable is provided on the pulling rope.
[0010]
The present invention has been made in consideration of such problems and situations. The number of members is small, the assembly can be easily performed, the overall length is shortened to improve the routing performance, and even if a large force is applied, the present invention is released. An object of the present invention is to provide a terminal device for pulling an optical fiber cable that can be reliably pulled without any problems.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, the optical fiber cable traction terminal according to the present invention employs the following means.
[0012]
That is, in the first aspect of the optical fiber cable towing terminal device in which the tension member of the optical fiber cable is inserted into and fixed to the sleeve and the sleeve is pulled by the ring portion , the tension member of the optical fiber cable is centered on the axis. A chuck member provided with an insertion hole to be inserted; a sleeve in which a storage chamber for accommodating the chuck member is provided; an elastic member that presses the chuck member against the small diameter end side of the sleeve; and a ring portion; A male screw provided at the other end of the ring portion, a protrusion provided at the tip of the male screw, having a smaller diameter than the male screw and supporting the elastic member, and a flange provided between the ring portion and the male screw are integrally formed. is a eyebolt was, ring portion has a connecting portion extending in a straight line extending from the semicircular ring and semicircular ring, flange Bind together with the connecting portion of the ring portion slopes of frustoconical form a frustum shape, and the outer diameter of the outer diameter and the sleeve of the flange of the ring portion substantially the same dimensions, and the male thread and the projection A receiving hole having a diameter slightly larger than that of the tension member of the optical fiber cable is dug into the portion.
[0013]
In this means, the ring part for pulling the optical fiber cable and the male screw screwed to the sleeve are integrally formed, the flange is formed in a truncated cone shape and has high strength, and the optical fiber cable can be pulled And Further, the ring portion, the flange, and the sleeve have substantially the same outer diameter, so that the towing is smooth and the waterproof treatment can be easily performed.
[0014]
According to a second aspect of the present invention, in the pulling terminal for an optical fiber cable according to the first aspect, a plurality of flat surfaces are provided on the outer peripheral surface of the eyebolt flange so as to avoid the ring portion, and a plurality of outer peripheral surfaces of the sleeve A flat surface is provided.
[0015]
In this means, a useful surface is provided on the outer peripheral surfaces of the eyebolt and the sleeve, both when the eyebolt is tightened by hand and when tightened by a tool such as a spanner.
[0016]
According to a third aspect of the present invention, in the optical fiber cable traction terminal device according to the first or second aspect, a protective material is provided to cover the coupling portion between the sleeve and the eyebolt and the coupling portion between the optical fiber cable and the sleeve. And
[0017]
With this means, the inside of the traction terminal is completely blocked from the outside.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an optical fiber cable traction terminal device according to the present invention will be described with reference to FIGS.
[0019]
In the optical fiber cable pulling terminal device 100 in this embodiment, the chuck member 1, the sleeve 2, and the elastic member 4 are used in the same manner as in the above-described conventional example. However, eyebolts 8 are provided in place of the parts of the above-described conventional example of the pooling bolt 3, the eye nut 5, the tightening nut 7, the aluminum can 15, the cap 16, the gasket 17, and the split pin 6.
[0020]
The chuck member 1 is formed in a cone shape divided into two along the axial center. The insertion hole 11 through which the tension member T of the optical fiber cable C is inserted is provided so as to penetrate through the center of the shaft, and a serrated groove 12 having a slightly smaller diameter than the tension member T of the optical fiber cable C is formed. Is formed. A tapered portion 13 that spreads outward is communicated with the end portion on the small diameter end side of the insertion hole 11.
[0021]
The sleeve 2 is formed in a cylindrical shape provided with two parallel planes 22 over the entire axial length of the outer peripheral surface. The accommodation chamber 21 for accommodating the chuck member 1 is formed in a tapered shape having an axial length longer than that of the chuck member 1. Note that grease is applied between the storage chamber 21 and the chuck member 1 to prevent the occurrence of rust and maintain the ease of sliding of the chuck member 1. A taper portion 23 that extends outward and opens to the outside of the sleeve 2 and forms an insertion portion of the tension member T of the optical fiber cable C communicates with the end portion on the small diameter end side of the housing chamber 21. A female screw 24 into which the eyebolt 8 is screwed is engraved at the end of the accommodating chamber 21 on the large diameter end side.
[0022]
The elastic member 4 is a coil spring that is elastically accommodated between the chuck member 1 and the eyebolt 8.
[0023]
The eyebolt 8 includes a head portion including a flange 81 and a ring portion 82, and a shaft portion including a male screw 84, a protrusion portion 85, and a receiving hole 86.
[0024]
The ring portion 82 includes a semicircular ring 88 and a connecting portion 89 extending from the semicircular ring 88 and extending linearly.
[0025]
Further, the flange 81 has a truncated cone shape, and is integrally coupled to the connecting portion 89 of the ring portion 82 by a truncated cone-shaped inclined surface 87. Further, two flat surfaces 83 are provided on the outer peripheral surface of the flange 81 so as to avoid the ring portion 82 (connecting portion 89).
[0026]
A cylindrical protrusion 85 that supports the elastic member 4 with a smaller diameter than the male screw 84 is provided at the tip of the male screw 84 of the eyebolt 8. The male screw 84 and the protruding portion 85 have a receiving hole 86 having a diameter slightly larger than that of the tension member T of the optical fiber cable C. The tension member T is sufficiently long with the chuck member 1. It is possible to combine with.
[0027]
Furthermore, the outer diameter of the ring portion 82 of the eyebolt 8, the outer diameter of the flange 81, and the outer diameter of the sleeve 2 are substantially the same as shown in FIGS.
[0028]
According to this embodiment, the above-described conventional example of the pooling bolt 3, the eye nut 5 and the like are integrated as the eye bolt 8, and the above-described conventional example of the split pin 6 and the tightening nut 7 are omitted. Further, since the flange 81 of the eyebolt 8 has a truncated cone shape, the flange 81 and the ring portion 82 are integrated with high strength. Therefore, the number of members is greatly reduced as compared with the above-described conventional example (reduction from 11 points in the conventional example to 5 points), the manufacturing cost is reduced, and the overall length is shortened to guide the traction. Even if it is a gold wheel with a large turning angle, the optical fiber cable C is prevented from being damaged due to the bending force during passage.
[0029]
In addition, since the outer diameter of the ring portion 82 of the eyebolt 8, the outer diameter of the flange 81, and the outer diameter of the sleeve 2 are substantially the same size, the passage of the gold wheel that guides traction is smooth, Generation of noise due to contact is reduced. That is, the routing performance of the optical fiber cable C is improved. Note that a step (with a perfect circle) due to the provision of the flat surface 83 of the flange 81 of the eyebolt 8 and the flat surface 22 of the sleeve 2 is small. Since the structure escapes to the outside even if it hits, the routing performance of the optical fiber cable C is not impaired.
[0030]
In addition, the absence of portions corresponding to the neck 33, the gasket receiver 34, the gasket 17, and the tightening nut 7 that form the surface 32 of the conventional pooling bolt 3 in the eyebolt 8 also contributes to shortening the overall length.
[0031]
Here, when attaching the optical fiber cable pulling terminal 100 to the optical fiber cable C, as shown in FIG. 5A, the eyebolt 8 is sufficiently loosened and the tension member T of the optical fiber cable C is attached. The taper portion 23 of the sleeve 2 is inserted into the insertion hole 11 of the chuck member 1. At this time, it is possible to rotate the eyebolt 8 by grasping the ring portion 82, the flange 81 or the flat surface 83 with a finger, and the gripping place is close to the male screw 84, and the eyebolt 8 is short. Compared to In addition, since the taper portion 23 of the sleeve 2 and the taper portion 13 of the chuck member 1 are aligned by sliding the tip of the tension member T of the optical fiber cable C, the tension member T of the optical fiber cable C can be easily inserted. become.
[0032]
When the tension member T of the optical fiber cable C is inserted, the chuck member 1 divided into two parts is separated and the insertion hole 11 is expanded, and the insertion hole of the chuck member 1 is expanded. 11, the tension member T of the optical fiber cable C is securely inserted.
[0033]
After that, as shown in FIG. 5B, the eyebolt 8 is rotated, and the elastic member 4 supported by the projection 85 is brought into strong contact with the end surface on the large diameter end side of the chuck member 1 to thereby chuck the chuck member. 1 is tightened to the small diameter end side of the accommodation chamber 21 of the sleeve 2. At this time, the eyebolt 8 can be rotated by grasping the ring portion 82 or the like with a finger, and the eyebolt 8 is rotated by putting a tool such as a spanner on the plane 22 of the sleeve 2 and the plane 83 of the eyebolt 8 respectively. You can also. In addition, since the flat surface 22 of the sleeve 2 is provided over the entire length of the axial length, a position where a tool such as a spanner that is hung on the flat surface 22 of the sleeve 2 is hung on a flat surface 83 of the eyebolt 8 can be freely set. Can be adjusted.
[0034]
By tightening the eyebolt 8, as shown in FIGS. 6 and 7, the separated chuck member 1 comes close and the insertion hole 11 contracts, and the biting groove 12 of the chuck member 1 becomes the optical fiber cable C. The tension member T is inserted into the tension member T and securely attached. It has been confirmed by experiments that sufficient traction force can be obtained by rotating the eyebolt 8 by holding the ring portion 82 or the like with a finger.
[0035]
Further, since the surface 83 is provided on the eyebolt 8 and the surface 22 is provided on the sleeve 2 for routing around a place where there are many obstacles, when the eyebolt 8 is rotated with a tool such as a spanner, the chuck member 1 The biting into the tension member T of the optical fiber cable C in the biting groove 12 can be made stronger, and the attachment of the optical fiber cable C to the tension member T can be made stronger.
[0036]
For waterproofing, it is also possible to wrap a waterproof vinyl tape from the optical fiber cable C to the eyebolt 8. At this time, since the outer diameter of the ring portion 82 of the eyebolt 8, the outer diameter of the flange 81, and the outer diameter of the sleeve 2 are substantially the same, it is easy to wind the vinyl tape. With this configuration, a practically sufficient waterproof performance can be obtained, and the optical fiber cable of this embodiment is compared when the pulling terminal 50 and the chuck member 1 of the conventional optical fiber cable shown in FIG. It can be seen that the towing terminal device 100 can achieve downsizing and a reduction in the number of parts (six points including vinyl tape).
[0037]
When the optical fiber cable traction terminal 100 is removed from the optical fiber cable C, the optical fiber cable C is cut near the sleeve 2 as shown in FIG. Thereafter, as shown in FIG. 8 (b), the eyebolt 8 is rotated and detached from the sleeve 2, the tightening of the chuck member 1 is released, and the tension member T of the optical fiber cable C is removed from the chuck member 1 and the sleeve 2. Pull out. When reusing, grease is applied to the outer peripheral surface of the chuck member 1 and then assembled as shown in FIG.
[0038]
FIG. 9 shows an example suitable for the case where high airtightness and watertightness are required when using this embodiment. That is, as a protective material for covering the connecting portion of the sleeve and the eyebolt and the tension member of the optical fiber cable and the insertion portion of the sleeve, the heat shrinkable tube 9 with an adhesive is connected from the optical fiber cable C through the sleeve 2 to the flange 82 of the eyebolt 8. The heat shrinkable tube 9 is shrunk by heating to about 120 ° C. with a hot gun and brought into close contact with the optical fiber cable C, sleeve 2 and eyebolt 8.
[0039]
According to this, the gap leading to the inside of the sleeve 2 is completely closed, and a complete waterproof fiber optic cable traction terminal is achieved. Further, it can be seen that even when the conventional optical fiber cable pulling terminal device 50 and the chuck member 1 shown in FIG. 10 are compared in size, a reduction in size and a reduction in the number of components can be achieved.
[0040]
In this embodiment, the plane 83 of the eyebolt 8 and the plane 22 of the sleeve 2 are two planes. However, it is possible to appropriately provide a plurality of parallel planes such as four planes and six planes. It can be made easy and a wrench can be easily applied. Further, since sufficient traction force can be obtained by turning by hand, the plane 83 of the eyebolt 8 and the plane 22 of the sleeve 2 can be eliminated as shown in FIGS.
[0041]
In this embodiment, the flange 81 of the eyebolt 8 has a truncated cone shape. However, the flange 81 need not have a perfect truncated cone shape. Even a raised shape is possible because it has sufficient strength for towing.
[0042]
【The invention's effect】
As described above, the optical fiber cable pulling terminal device according to the present invention is such that the optical fiber cable tension member is inserted into the sleeve and fixed, and the sleeve is pulled by the ring portion. The ring portion, a male screw provided at the other end of the ring portion, and an eyebolt integrally formed with a flange provided between the ring portion and the male screw, the ring portion being a semicircular ring and a semicircle The flange has a conical shape extending from the ring, and the flange has a frustoconical shape, and is integrally joined to the concatenated portion of the ring portion by a truncated cone-shaped inclined surface. The outer diameter of the sleeve is almost the same size, so the number of parts is small and assembly is easy, the overall length is shortened to improve the routing performance, and even if a large force is applied, it does not come off. There is an effect that can be towed in.
[0043]
Moreover, since sufficient traction force can be obtained by screwing the eyebolt into the sleeve by hand, there is an effect that workability can be improved.
[0044]
In addition, since the outer diameter of the ring portion, the outer diameter of the flange, and the outer diameter of the sleeve are substantially the same size, there is an effect that simple waterproofing with a vinyl tape or the like can be easily performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a pulling terminal for an optical fiber cable according to the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is an enlarged cross-sectional view taken along line XX of FIG.
4 is an exploded perspective view of FIG. 1. FIG.
FIG. 5 shows the work of attaching to the optical fiber cable of FIG. 1, and the work steps are shown in the order of (a) and (b).
6 is a cross-sectional view of the state of attachment to the optical fiber cable of FIG. 1. FIG.
7 is an enlarged sectional view taken along line YY in FIG.
FIG. 8 is a reduced view in which a part configuration is omitted, showing the work for removing the optical fiber cable from FIG. 1, and the work steps are shown in the order of (a) and (b).
9 is a cross-sectional view showing another example of use of FIG.
FIG. 10 is a cross-sectional view showing a conventional example.
FIG. 11 is a cross-sectional view showing another embodiment of a pulling terminal for an optical fiber cable according to the present invention.
12 is a side view of FIG. 11. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chuck member 2 Sleeve 3 Pooling bolt 4 Elastic member 5 Eye nut 6 Split pin 7 Tightening nut 8 Eye bolt 9 Heat shrinkable tube 15 Aluminum can 16 Cap 17 Gasket 22 Plane 24 Female thread 31 Screw part 32 Face 33 Neck 34 Gasket receptacle 50 Optical fiber Cable pulling terminal 51 Ring part 52 Screw part 81 Flange 82 Ring part 83 Plane 84 Male screw 85 Projection part 86 Receiving hole 87 Slope 100 Optical fiber cable pulling terminal C Optical fiber cable R Pulling rope T Tension member

Claims (3)

In a fiber optic cable traction terminal device for inserting and fixing a tension member of an optical fiber cable through a sleeve, and pulling the sleeve by a ring portion,
A chuck member provided with an insertion hole through which a tension member of an optical fiber cable is inserted at the center of the shaft;
A sleeve in which a storage chamber for storing the chuck member is provided;
An elastic member for pressing the chuck member against the small diameter end of the sleeve;
A ring portion, a male screw provided at the other end of the ring portion, a protrusion provided at the tip of the male screw and having a smaller diameter than the male screw and supporting the elastic member, and a flange provided between the ring portion and the male screw There a eyebolts formed integrally,
The ring part has a semicircular ring and a connecting part extending from the semicircular ring and extending in a straight line. The flange has a truncated cone shape and is joined integrally with the connecting part of the ring part by a truncated cone shaped slope. The outer diameter of the flange, the outer diameter of the flange, and the outer diameter of the sleeve are approximately the same dimension , and the male screw and the protruding portion have a receiving hole having a diameter slightly larger than that of the tension member of the optical fiber cable. A terminal device for towing an optical fiber cable, characterized by having been dug .    The pulling terminal device for an optical fiber cable according to claim 1, wherein a plurality of flat surfaces are provided around the outer peripheral surface of the eyebolt flange so as to avoid the ring portion, and a plurality of flat surfaces are provided on the outer peripheral surface of the sleeve. An optical fiber cable towing terminal device.    The optical fiber cable pulling terminal device according to claim 1 or 2, further comprising a protective material that covers the coupling portion between the sleeve and the eyebolt and the coupling portion between the optical fiber cable and the sleeve. Terminal tool.

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