JP4832390B2 - Straight connection closure - Google Patents

Description

  The present invention relates to a linear connection closure, and more particularly to a linear connection closure suitable for use in maintenance of an optical drop cable.

  In the maintenance of the optical drop cable drawn into the subscriber's house (home), the optical drop cable may be defective for some reason or the trouble transfer of the optical drop cable may be required. As a countermeasure in such a case, replace the defective part of the optical drop cable with the new optical drop cable, and connect the replaced optical drop cable in a straight line using the remaining optical drop cable and the linear connection closure. Has been done.

For example, as shown in FIG. 11, the first utility pole P ₁ and the first utility pole P _{1 provided} with a drawer closure 90 for drawing out the optical drop cable 1 drawn into the subscriber's house H from the aerial optical fiber cable (FTTH cable). When the optical drop cable 1 is disconnected at a disconnection point (indicated by a cross in FIG. 11) between the _second utility pole P ₂ adjacent to the current utility pole P ₁ , a commercially available linear connection closure 91 is generally used. Although the optical drop cable 1 is being rebuilt using a cable, the linear connection closure 91 is stored in the spiral hanger 92 because the dimensions of the linear connection closure 91 are large (for example, 27 mm in diameter and 350 mm in length). Therefore, the optical drop cable 1 is replaced with a new optical drop cable in the section A between the _third telephone pole P ₃ nearest to the subscriber house H and the subscriber house H. It has been changed to 1.

In addition, as the linear connection closure which aimed at size reduction and weight reduction, there exists the following.
(1) In Patent Document 1 below, an optical fiber is wound around a spiral groove on the outer peripheral surface of a main body, and the end of this optical fiber is unwound from the end of the main body and taken out. The optical fiber of the cable is passed through the hole in the lid, and the end of the optical fiber of the dropped drop optical fiber cable is unraveled and connected to the end of the optical fiber by fusion or mechanical splice connection. By inserting the excess part of the fiber into the cavity of the main body while storing the connection part in the cavity of the main body and fixing the lid to the main body, it is easy and no matter where the drop optical fiber cable breaks. An optical fiber cable connection auxiliary device that can be properly connected is disclosed.
(2) The following Patent Document 2 describes a straight connection structure of an optical drop cable in which an optical fiber core portion and a support wire are integrated, and two support wires attached to two bolts attached to a connection member. Each end of the cable is fixed to the connection member by winding and tightening, and each support wire is covered with a spiral tube, and a mechanical splice that connects the optical fibers on both sides is turned around the connection member to place each optical fiber on the outer circumference of the spiral tube. In that state, the mechanical splice is attached to the mechanical splice mounting portion of the connecting member, and the whole is housed in a protective sleeve, and end caps are put on both ends to provide and support an extra length. The optical drop cable straight line connection structure is designed so that sufficient tension can be obtained even if the wire is fixed with the resin covered. There has been disclosed.
(3) The following Patent Document 3 describes a support line connecting portion to which a support line exposed from the ends of both optical drop cables is connected, and an optical fiber exposed from the ends of both optical drop cables. It has an optical fiber connection part where terminals are connected with a surplus length, and a cylindrical surplus length storage guide mounted on the connected support line, and an optical fiber is connected to the outer periphery of the cylindrical surplus length storage guide An optical drop cable connecting portion is disclosed which is small and light and has few restrictions on installation locations by being wound in a state where the extra length ensures an allowable minimum bending diameter of the optical fiber.
JP 2005-031521 A Japanese Patent Laying-Open No. 2005-070564 JP 2004-325998 A

However, when the optical drop cable 1 is disconnected at the disconnection point indicated by a cross in FIG. 11, the optical drop cable 1 is replaced in the section A between the _third utility pole P ₃ and the subscriber house H. The replacement section of the optical drop cable 1 is the section B between the drawer closure 90 and the straight connection closure 91, and it is necessary to replace the optical drop cable 1 in the healthy section (section from the section B to the section C). This is one of the reasons why the cost of replacement work increases.
Therefore, in order to minimize the cost of the replacement work, the optical drop cable 1 is replaced only in the section C between the drawer closure 90 and the disconnection point, and the replacement optical drop cable 1 and the remaining optical drop cable 1 Is required to be connected in the vicinity of the disconnection point.

In addition, the linear connection closure disclosed in Patent Documents 1 to 3 described above has a complicated structure for the linear connection closure or an increased number of work procedures for the replacement work of the optical drop cable due to the following reasons. There is a problem of doing.
(1) In the optical fiber cable connection auxiliary disclosed in the above-mentioned Patent Document 1, the optical fiber is wound around a spiral groove on the outer peripheral surface of the main body, or the optical fiber of the drop optical fiber cable is connected to the lid. It is necessary to penetrate the hole or to fix the lid part to the main body part.
(2) In the straight connection part structure of the optical drop cable disclosed in Patent Document 2 above, a spiral tube is put on each support line, or a mechanical splice that connects optical fibers on both sides is rotated around the connection member. Thus, each optical fiber must be spirally wound around the outer periphery of the spiral tube.
(3) In the connection portion of the optical drop cable disclosed in the above-mentioned Patent Document 3, the optical fiber connection extra length is wound around the outer circumference of the cylindrical extra length storage guide in a state where the allowable minimum bending diameter of the optical fiber is secured. It needs to be attached.

  An object of the present invention is to provide a linear connection closure that can be miniaturized to such an extent that it can be stored in a spiral hanger, and that has a simple structure and can improve the workability of an optical drop cable replacement work. There is to do.

The linear connection closure of the present invention is a linear connection closure (10) used for linearly connecting the first and second optical drop cables (1 ₁ , 1 ₂ ), wherein the first and second optical drop cables are used. A main body (11) for holding an optical fiber connecting device (40) for connecting the first and second cores (2 ₁ , 2 ₂ ) of the drop cable, and the first and second optical drop cables First and second optical drop cable fixing means for supporting the first and second support wires (3 ₁ , 3 ₂ ) and fixing the first and second optical drop cables, respectively. The first and second optical drop cable fixing means rotate the main body to rotate the first support line of the first optical drop cable fixing means and the second optical drop cable. And respectively attached to both ends of the body to be able to adjust the distance between the support portion of the second supporting line constant means (S), wherein the body has a columnar shape, the light a plurality of holding recesses for holding the fiber connection device (11a ₁ ~11a _4), characterized in that it is formed respectively on the peripheral surface in the longitudinal direction along the body of the main body.
Here, the main body is formed with a bolt hole (11c) in which a thread groove is formed so as to have a reverse screw relationship between the one end surface side and the other end surface side of the main body. The two optical drop cable fixing means are the first and second eyebolts (12 ₁ , 12 ₂ ), and the first screw portion (12a ₁ ) of the first eyebolt and the second eyebolt second The screw heads (12a ₂ ) may be formed with thread grooves that have a reverse screw relationship with each other.
The main body has a quadrangular prism shape, and first to fourth holding recesses (11a _{1 to} 11a ₄ ) for holding the optical fiber connecting device are arranged along the longitudinal direction of the main body. The upper surface, the left side surface, the lower surface and the right side surface may be respectively formed.
First and second lock nuts (13 ₁ , 13 ₂ ) that are screwed into the first and second eyebolts to prevent inadvertent rotation of the first and second eyebolts, respectively. You may have.

The linear connection closure of the present invention has the following effects.
(1) Since the diameter can be about 12 to 18 mm and the length is about 120 to 150 mm, the linear connection closure can be miniaturized to such an extent that it can be stored in the spiral hanger.
(2) Since the straight connection closure can be accommodated in the spiral hanger, the degree of freedom of the installation location of the straight connection closure is improved, which is advantageous in terms of maintenance of the optical drop cable.
(3) Since the main part of the linear connection closure can be constituted by, for example, a main body, first and second eyebolts, and first and second lock nuts, a simple structure can be achieved.
(4) Since the optical drop cable can be replaced by rotating the body after supporting the optical drop cable support line and fixing the optical drop cable, the workability of the optical drop cable replacement work is improved. It becomes easy.

  For the above purpose, the first and second eyebolts can be adjusted by rotating the main body so that the distance between the first head of the first eyebolt and the second head of the second eyebolt can be adjusted. It was realized by attaching to both ends of the main body.

Hereinafter, embodiments of the linear connection closure of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a linear connection closure 10 according to an embodiment of the present invention includes a main body 11, first and second eyebolts 12 ₁ and 12 _2, and first and second lock nuts 13 ₁ and 13. ₂ and first and second protective covers 14 ₁ , 14 ₂ .

Here, the body 11 is a rectangular prism member, FIG. 2 (a), the (b), the mechanical splice 40 (in FIG. 4 (b first, as shown in) the optical drop cable 1 ₁ No. the first to fourth holding recess 11a for holding the first core wire 2 ₁ and the optical fiber connection device) for optically connecting the second core wire 2 ₂ of the second optical drop cable 1 _{2 1 to} 11a ₄ are formed on the upper surface, left side surface, lower surface and right side surface of the main body 11 along the longitudinal direction of the main body 11, respectively.
A binding band recess 11b for winding a binding band 30 (see FIG. 8) for fixing the mechanical splice 40 to the main body 11 is provided at the longitudinal center of the upper surface, left side surface, lower surface and right side surface of the main body 11. Is formed.

Bolt holes 11 c are formed in the main body 11 so as to penetrate along the longitudinal direction of the main body 11. However, the bolt hole 11c is not formed with a continuous thread groove from one end surface (front surface) to the other end surface (back surface) of the main body 11. For example, a right-hand thread is provided from one end surface of the main body 11 to the longitudinal center portion. Are formed on the one end surface side and the other end surface side of the main body 11 such that a left-hand thread groove is formed from the longitudinal center of the main body 11 to the other end surface. Thread grooves are formed so that
As shown in FIG. 3A, the first eyebolt 12 ₁ includes a first screw portion 12a ₁ and a ring-shaped first head portion 12b ₁ . Similarly, as shown in FIG. 3B, the second eyebolt 12 ₂ includes a second screw portion 12a ₂ and a ring-shaped second head portion 12b ₂ . The a first eyebolt 12 ₁ of the first threaded portion 12a ₁ and the second second eyebolt 12 _second threaded portion 12a _2, a screw groove which is a relationship of opposite screws with each other are formed.
As a result, when the main body 11 is rotated about the central axis along the length direction of the main body 11 with the first and second eyebolts 12 ₁ and 12 ₂ attached to both ends of the main body 11, the rotation of the main body 11 occurs. since the first and second eyebolt 12 _1, 12 ₂ are moved together in the direction drawn into or body 11 projects from the body 11 depending on the direction, the first eyebolt 12 ₁ first by rotation of the body 11 distance between the second head 12b ₂ of the head 12b ₁ and second eyebolt 12 ₂ (hereinafter, referred to as "span S '.) can be adjusted (see Figure 6).

The first and second lock nuts 13 ₁ , 13 ₂ are screwed into the first and second eye bolts 12 ₁ , 12 ₂ , respectively, and the main body 11 and the first and second eye bolts 12 ₁ , 12 ₂ are connected. Inadvertent rotation of the first and second eyebolts 12 ₁ and 12 ₂ is prevented by applying a tensile force between them. _On the inner surfaces of the first and second lock nuts 13 ₁ and 13 ₂ , thread grooves having a reverse screw relationship are formed so as to be screwed to the first and second eye bolts 12 ₁ and 12 ₂ , respectively. Has been.

The first and second eyebolts 12 ₁ and 12 ₂ support the first and second support lines 3 ₁ and 3 ₂ of the first and _second optical drop cables 1 ₁ and 12, respectively. It functions as first and second optical drop cable fixing means for fixing the first and second optical drop cables 1 ₁ and 1 ₂ , respectively.

The protective cover 14 of the _first and second, 14 ₂ is used to protect the first and second optical drop cable 1 _1, 1 ₂ linear connection closure 10 after connection, first and second is the optical drop cable 1 _1, 1 ₂ is mounted through each is projected to the first and second optical drop cable 1 _1, 1 ₂ by tightening the screw portions formed at opposite ends of each other The main body 11, the first and second lock nuts 13 ₁ and 13 ₂ and the first and second eye bolts 12 ₁ and 12 ₂ are covered (see FIG. 9). The first and second protective covers 14 ₁ and 14 ₂ can be constituted by, for example, a plastic molded product.

Next, operating procedures first and second optical drop cable 1 _1, 1 ₂ a linearly connected with straight lines connecting the closure 10 will be described with reference to FIGS. 4 to 9.
The operator passes the heat compression tube 16 through the first or second optical drop cables 1 ₁ and 1 ₂ in advance, and passes through the first and second optical drop cables 1 ₁ and 1 ₂ . Two protective covers 14 ₁ and 14 ₂ are passed in advance.
In performing Chokawa working optical drop cable 1 as shown in FIG. 11, a first optical drop cable 1 ₁ becomes a new optical drop cable from the drawer closure 90, the second optical drop cable 1 ₂ is the remaining optical drop cable 1 on the subscriber's home H side.

Further, the worker screws the first and second eye bolts 12 ₁ , 12 ₂ into which the first and second lock nuts 13 ₁ , 13 ₂ are screwed into the bolt holes 11 c of the main body 11, respectively. First and second eyebolts 12 ₁ and 12 ₂ are attached to the main body 11 in advance. At this time, as shown in FIG. 4 (a), the span S (distance between the first and the first head 12b ₁ of eyebolt 12 ₁ and the second head 12b ₂ of the second eyebolt 12 ₂₎ The first and second eye bolts 12 ₁ , 12 ₂ are screwed into the bolt holes 11 c of the main body 11 until they are minimized.

When the first and second optical drop cables 1 ₁ and 1 ₂ are linearly connected using the linear connection closure 10, first, an operator first connects the first and second optical drop cables 1 ₁ and 1 ₂ . The coating is cut to separate the first and second support wires 3 ₁ and 3 ₂ by a predetermined length (for example, 150 mm).

Subsequently, the worker peels off the coating of the first and second optical drop cables 1 ₁ and 1 ₂ for a predetermined length (for example, 85 mm), and removes the first and second cores 2 ₁ and 2 ₂ . Expose.

Subsequently, the worker peels off the coating of the first and second cores 2 ₁ and 2 ₂ to a predetermined length (for example, about 45 mm) to expose the optical fiber strand, and then uses the mechanical splice 40. The strand of the optical fiber is cut to a specified length (for example, 12.5 mm) to be connected.

Subsequently, the worker connects the first and second core wires 2 ₁ and 2 ₂ with the mechanical splice 40.

Subsequently, as shown in FIG. 4B, the worker places the first and second support wires 3 ₁ and 3 ₂ separated from the first and _second optical drop cables 1 ₁ and 1 ₂ into the first. The first and second support wires 3 ₁ and 3 ₂ are inadvertently opened after the first and _second heads 12b ₁ and 12b ₂ of the second and _second eyebolts 12 ₁ and 12 ₂ are folded back. The first and second support wires 3 ₁ and 3 ₂ are fixed by the first and second pressing sleeves 4 ₁ and 4 _{2 so} that they are not detached from the first and second eyebolts 12 ₁ and 12 ₂ . Thereby, the first and second support lines 3 ₁ and 3 ₂ are supported by the first and second heads 12b ₁ and 12b ₂ of the first and _second eyebolts 12 ₁ and 12 ₂ , respectively.
Thereafter, the operator drops the first and second optical drop cables 1 ₁ , 1 ₂ and the first and second support wires 3 ₁ , 3 ₂ so as not to be separated. winding the cable ₁ 1, 1 ₂ and the first and second supporting line 3 _1, 3 ₂ and for the prevention first and second loosened vinyl tape 15 _1, 15 _2, respectively.

When the first and second support wires 3 ₁ and 3 ₂ are supported by the first and second heads 12b ₁ and 12b ₂ of the first and _second eyebolts 12 ₁ and 12 ₂ , respectively, the span is thus obtained. S for (distance between the first eyebolt 12 first head 12b ₁ and second eyebolt 12 ₂ of the second head 12b _{2 1)} is minimized (see FIG. 4 (a)) The first and second cores 2 ₁ and 2 ₂ are in a relaxed state (see FIG. 5A).
Therefore, in order to first and second cord 2 _1, 2 ₂ of the slack adjustment of the (extra length handling), is operator, first and second eyebolt 12, as shown by the arrows in FIG. 6 ₁ , 12 ₂ , the main body 11 is rotated in the direction in which the first and second heads 12 b ₁ , 12 b ₂ protrude from the main body 11. Thus, the span S simultaneously (first first eyebolt 12 ₁ of the head 12b ₁ the distance between the second head 12b ₂ of the second eyebolt 12 ₂₎ is gradually larger when the first and second The amount of looseness of the core wires 2 ₁ and 2 ₂ gradually decreases.
FIG 5 (b) first and second cord 2 as shown in ₁ and 2 ₂ degrees to the first and second cord 2 ₁ not applied tension, adjust 2 ₂ slack, the operator The first and second lock nuts 13 ₁ and 13 ₂ are fastened to both end faces of the main body 11 so that the main body 11 does not rotate carelessly.

Subsequently, as shown in FIG. 7, the worker holds the first to fourth holding recesses 11 a _{1 to} 11 a ₄ (see FIG. 2) formed in the main body 11 at the position where it is most easily inserted. The mechanical splice 40 is inserted into the recess. Thereafter, as shown in FIG. 8, the worker holds the mechanical splice 40 in the main body 11 by winding the binding band 30 along the binding band recess 11 b formed in the main body 11 and fastening the binding band 30. .

Subsequently, the worker moves the first and second protective covers 14 ₁ and 14 ₂ close to each other to a position covering the main body 11, and then moves the first and second protective covers 14 ₁ and 14 ₂ . The screw portions are tightened to cover the main body 11, the first and second lock nuts 13 ₁ and 13 ₂ and the first and second eyebolts 12 ₁ and 12 ₂ as shown in FIG.

Subsequently, the worker covers the entire linear connection closure 10 with the heat-shrinkable tube 16, and then applies first and second waterproof vinyl tapes 17 ₁ , 17 ₂ is wound up to the place where the first and second optical drop cables 1 ₁ and 1 ₂ and the first and second support wires 3 ₁ and 3 ₂ are separated. Thus, waterproofing is performed, and both end portions of the heat-shrinkable tube 16 are fixed to the first and second optical drop cables 1 ₁ and 1 ₂ , respectively.

As described above, the linear connection closure 10 includes the main body 11, the first and second eyebolts 12 ₁ and 12 ₂ , the first and second lock nuts 13 ₁ and 13 _2, and the first and second protective covers. Since it can be composed of 14 ₁ and 14 ₂ , it can be made very compact.
For example, in order to hold the mechanical splice 50 having a length of about 40 mm as shown in FIG. 5A, the length of the main body 11 may be about 50 mm. Therefore, the main body 11 has a cross-sectional shape of about 10 mm × It is sufficient that the shape is a square column having a length of about 10 mm and a length of about 50 mm. As a result, the linear connection closure 10 has a diameter of about 12 to 18 mm and a full length (length) L (see FIG. 10) of about 120 mm to 120 mm even when the first and second protective covers 14 ₁ and 14 ₂ are attached. Since it can be made into a cylindrical shape with both ends being small in diameter at about 150 mm, it can also be stored in the spiral hanger 92 (see FIG. 11).
Thereby, since there is no restriction on the connection position of the optical drop cable, for example, in the example shown in FIG. 11, the replacement work of the optical drop cable 1 can be performed at the disconnection point. Moreover, since the linear connection closure 10 is very compact, the appearance of the connection location of the optical drop cable 1 is improved.

In the above description, the shape of the main body 11 of the linear connection closure 10 is a quadrangular prism. However, any shape can be used as long as the mechanical splice 40 can be held. The main body 11 is preferably plate-shaped or columnar. In particular, the shape of the main body 11 is a cylinder or a prism (triangular prism, quadrangular prism, pentagonal prism, etc.), so that the retaining recesses for retaining the mechanical splice 40 (first to fourth shown in FIG. 2B). since the reference holding recesses 11a ₁ ~11a ₄₎ can be formed at a plurality of positions in the circumferential direction of the body 11, it is possible to increase the degree of freedom of adjustment of the span S.

  2A, the bolt holes 11c are formed so as to penetrate the main body 11. However, the bolt holes 12 do not need to penetrate the main body 11, and are formed at both ends of the main body 11, respectively. May be. In this case, the depth of the bolt hole from the end surface of the main body 11 can be appropriately determined according to the adjustable range of the span S. The two bolt holes formed at both ends of the main body 11 are formed so as to have a reverse screw relationship with each other so that the span S can be adjusted by rotating the main body 11.

Furthermore, although the replacement work of the single-core optical drop cable has been described, the linear connection closure of the present invention can also be used in the replacement work of the multi-fiber optical drop cable.
Furthermore, although the mechanical splice 40 has been described as the optical fiber connecting device, a fusion spliced device may be used as the optical fiber connecting device.

1 is an exploded perspective view of a linear connection closure 10 according to one embodiment of the present invention. FIG. 2A and 2B are diagrams illustrating a structure of a main body 11 of the linear connection closure 10 illustrated in FIG. 1, in which FIG. It is a figure for demonstrating the structure of the 1st and 2nd eyebolts 12 ₁ and 12 ₂ shown in FIG. It is a figure for demonstrating the operation | work procedure which connects the 1st and 2nd optical drop cable 1 ₁ and 1 ₂ linearly using the linear connection closure 10 shown in FIG. It is a figure for demonstrating the extra length process at the time of connecting the 1st and 2nd optical drop cables 1 ₁ and 1 ₂ linearly using the linear connection closure 10 shown in FIG. It is a figure for demonstrating the operation | work procedure which connects the 1st and 2nd optical drop cable 1 ₁ and 1 ₂ linearly using the linear connection closure 10 shown in FIG. It is a figure for demonstrating the operation | work procedure which connects the 1st and 2nd optical drop cable 1 ₁ and 1 ₂ linearly using the linear connection closure 10 shown in FIG. It is a figure for demonstrating the operation | work procedure which connects the 1st and 2nd optical drop cable 1 ₁ and 1 ₂ linearly using the linear connection closure 10 shown in FIG. It is a perspective view which shows the state which mounted | wore the 1st and 2nd protective covers 14 ₁ and 14 ₂ to the linear connection closure 10 shown in FIG. It is a figure for demonstrating the dimension of the linear connection closure 10 shown in FIG. It is a figure for demonstrating the method of performing the replacement work of an optical drop cable using the conventional linear connection closure 91. FIG.

Explanation of symbols

1 Optical drop cable 1 ₁ , 1 ₂ 1st and 2nd optical drop cable 2 ₁ , 2 ₂ 1st and 2nd core wire 3 ₁ , 3 ₂ 1st and 2nd support line 4 ₁ , 4 ₂ 1st 1 and second holding sleeve 10 linear connection closure 11 body 11a _{1 to} 11a ₄ first to fourth holding recess 11b binding band recess 11c bolt holes 12 ₁ and 12 ₂ first and second eye bolts 12a ₁ , 12a ₂ first and second screw portions 12b ₁ and 12b ₂ first and second heads 13 ₁ and 13 ₂ first and second lock nuts 14 ₁ and 14 ₂ first and second protective covers 15 ₁ , 15 ₂ First and second anti-scattering vinyl tape 16 Heat-shrinkable tubes 17 ₁ , 17 ₂ First and second waterproofing vinyl tapes 30 Binding band 40 Mechanical splice 90 Drawer closure 91 Linear connection cup Roja 92 Spiral hanger A, B, C Section H Subscriber's house P _{1 to} P ₃ First to third utility poles S Span L Total length

Claims (4)

A linear connection closure (10) used for linearly connecting the first and second optical drop cables (1 ₁ , 1 ₂ ),
A main body (11) for holding an optical fiber connection device (40) for connecting the first and second core wires (2 ₁ , 2 ₂ ) of the first and second optical drop cables;
The first and second optical drop cables for fixing the first and second optical drop cables by supporting the first and second support lines (3 ₁ , 3 ₂ ) of the first and second optical drop cables, respectively. A second optical drop cable fixing means;
The first and second optical drop cable fixing means rotate the main body to rotate the main support portion of the first optical drop cable fixing means and the second optical drop cable fixing means. Are attached to both ends of the main body so that the distance (S) between the second support line and the support portion can be adjusted .
The body has a columnar shape;
With each of the plurality of holding recesses for holding the optical fiber connection device (11a ₁ ~11a ₄₎ are formed along the longitudinal direction of the body, the plurality several holding recesses body Are formed one by one along the circumferential direction of
A linear connection closure characterized by that. The main body is formed with a bolt hole (11c) in which a thread groove is formed so as to have a reverse screw relationship between the one end surface side and the other end surface side of the main body,
The first and second optical drop cable fixing means are first and second eyebolts (12 ₁ , 12 ₂ );
The first screw part (12a ₁ ) of the first eyebolt and the second screw part (12a ₂ ) of the second eyebolt are respectively formed with screw grooves having a reverse screw relationship.
The linear connection closure according to claim 1, wherein: The body has a quadrangular prism shape;
First to fourth holding recesses (11a _{1 to} 11a ₄ ) for holding the optical fiber connection device are respectively provided on the upper surface, the left side surface, the lower surface and the right side surface of the main body along the longitudinal direction of the main body. Formed,
3. A linear connection closure according to claim 1 or 2, characterized in that First and second lock nuts (13 ₁ , 13 ₂ ) that are screwed into the first and second eyebolts to prevent inadvertent rotation of the first and second eyebolts, respectively. The linear connection closure according to claim 1, further comprising a linear connection closure.