JP2006308638A - Optical fiber cable fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely fix an optical fiber cable to an excessive-length processing device, etc., without affecting the transmission characteristics of a coated optical fiber. <P>SOLUTION: A guide trench 22 in which a coated optical fiber 2 is contained is formed on the base 12 of a fixture body 100 from one end to another end. A plurality of first engaging protrusions 24 are formed at an interval at both sides of the guide trench 22 along the direction of the trench. These first engaging protrusions 24 are brought into contact with the inner peripheral sides of curved parts of respective tension members 4 which are curved in the shape of meandering by being separated from an coated optical fiber 2 from the separation portion 8 of an optical fiber cable 6 and which are embedded on the base 12 of the fixture body 100. Then, the slipping off of the tension members 4 are prevented by friction force among the first engaging protrusions 24 and the curved parts of the tension members 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical fiber cable fixture for fixing an optical fiber cable to a communication device such as a surplus length processing device.

Recently, the transmission rate of signals transmitted between devices has been improved, and optical fiber cables have been frequently used instead of electric cables as transmission media. An optical fiber core wire through which an optical signal is transmitted has low strength. For this reason, the optical fiber cable is formed by covering the tension member together with the optical fiber core wire with resin. For example, an optical fiber cable introduced into a surplus length processing apparatus or the like is fixed by attaching a tension member to an optical fiber cable fixture provided in the surplus length processing apparatus. The optical fiber cable is attached to this type of optical fiber cable fixture by tightening a tension member with a screw or the like (see Patent Document 1).
JP-A-7-134214

  When the tension member is attached to the optical fiber cable fixture with a screw or the like, a tool for tightening the screw is required and small parts such as a screw and a washer are required. For this reason, it takes time to attach and remove the optical fiber cable. Further, when this type of optical fiber cable fixture has a structure in which the optical fiber core wire is fastened together with the tension member, the optical fiber core wire may be distorted by tightening the screw, and the optical signal transmission characteristics may be deteriorated.

  An object of the present invention is to provide an optical fiber cable fixture for easily and surely fixing an optical fiber cable to an extra length processing device or the like without affecting the transmission characteristics of the optical fiber core wire.

  The optical fiber cable fixture of claim 1 has a fixture body having a bottom surface that is recessed from the periphery. The holding portion is formed at one end of the fixture main body on the optical fiber cable introduction side, and holds a separation portion where the optical fiber core wire and the tension member in the optical fiber cable are separated. The extraction portion is formed at the other end of the fixture main body, and is formed to extend the optical fiber core wire extending from the holding portion to the outside of the fixture main body. The guide groove is formed on the bottom surface of the fixture main body from one end to the other end, and stores the optical fiber core wire extending on the fixture main body. A plurality of first locking protrusions are formed on both sides of the guide groove on the bottom surface of the fixture main body at intervals along the groove direction. These first locking projections are bent from the separation portion and meandering, and contact the inner peripheral side of the bending portion of each tension member embedded on the bottom surface of the fixture body. The tension member is prevented from coming out to the introduction side by the frictional force between the first locking projection and the curved portion of the tension member. In particular, when the tension member embedded on the bottom surface is pulled toward the introduction side, the force that moves toward the guide groove acts on the tension member close to the separation portion, so that the contact between the tension member and the first locking protrusion A strong frictional force is generated in the part.

According to another aspect of the optical fiber cable fixture of the present invention, three first locking projections are formed on each side of the guide groove. The first locking protrusion at the center of each first locking protrusion row arranged in the groove direction is formed integrally with the side wall and the bottom surface with the side wall of the guide groove protruding outward. By forming the central first locking protrusion integrally with the side wall as well as the bottom surface, the strength of the central first locking protrusion is increased, and the first locking protrusion is attached when the tension member is attached to the fixture body. The protrusion is prevented from being damaged.

  In the optical fiber cable fixture according to claim 3, the first locking protrusion at the center is provided with a locking rib protruding toward the inner peripheral side at a position where the inner peripheral side of the bending portion contacts. When the tension member embedded on the bottom surface is pulled toward the introduction side, the locking rib bites into the inner peripheral portion of the tension member, thereby preventing the tension member from moving toward the introduction side. That is, the tension member is prevented from loosening toward the introduction side.

  In the optical fiber cable fixing tool according to the fourth aspect, the end opposite to the bottom surface of the locking rib is chamfered. For this reason, when the tension member is curved and embedded on the bottom surface of the fixture main body, the embedding work is facilitated. In addition, the worker is prevented from being injured during the embedding work.

  In the optical fiber cable fixing tool according to claim 5, the second locking protrusion is located on the bottom surface of the fixing body on the side opposite to the guide groove of the first locking protrusion located on the other end side. It is formed in parallel with the protrusion. The distance between the juxtaposed first and second locking projections is larger than the outer diameter of the tension member. When the tension member is disposed between the first locking protrusion and the second locking protrusion, the tension member is restricted from returning to a linear shape by the second locking protrusion. For this reason, the frictional force between the central locking projection and the tension member is prevented from being reduced, and the tension member is prevented from loosening toward the introduction side.

  According to another aspect of the optical fiber cable fixture of the present invention, the first locking protrusions protruding from the bottom surface are formed in a rectangular cross section, and the protruding ends of the first locking protrusions are chamfered. When the tension member embedded on the bottom surface is pulled toward the introduction side, the tension member loosens toward the introduction side by the corners of the first locking projections biting into the inner peripheral side of the bending portion of the tension member. Is prevented. Further, the chamfering facilitates the work of embedding the tension member and prevents the operator from being injured during the embedding work.

  According to another aspect of the optical fiber cable fixture of the present invention, the first locking projection is formed at a symmetrical position with the guide groove as an axis. For this reason, when the tension member embedded on the bottom surface is pulled toward the introduction side, the pulling force is equally distributed to the tension members on both sides of the guide groove. Therefore, the force that moves the tension member toward the guide groove is equal, and the frictional force at the contact portion between the tension member and the first locking projection is equal on both sides of the guide groove. Since there is no bias in the frictional force, the fixing force of the tension member to the fixture body can be increased.

  According to another aspect of the optical fiber cable fixture of the present invention, the plate-like cover is disposed so as to cover the opening portion facing the bottom surface of the fixture body. The cover includes an insertion hole into which the protruding end of the first locking projection that protrudes from the bottom surface is inserted when the cover is attached to the fixture main body. For this reason, attaching the cover prevents the meandering portion of the tension member from coming off to the cover side. Further, the first locking protrusion is prevented from being damaged by an external force.

  The optical fiber cable fixture according to claim 9, wherein the cover has a cable pressing projection protruding toward the fixture body at a position corresponding to the space between the first locking projections arranged in the groove direction on the surface facing the fixture body. It has. The meandering portion of the tension member is pressed to the bottom side by the cable pressing protrusion. This prevents the tension member from coming off to the cover side.

In the optical fiber cable fixing tool according to the tenth aspect, the cover includes a locking portion that protrudes toward the fixing body on the surface facing the fixing body. The fixture main body includes an engaging portion for locking the locking portion on the bottom surface. For this reason, after embedding the tension member on the bottom surface of the fixture main body, the cover is attached to the fixture main body simply by placing and pressing the cover on the fixture main body.

  According to another aspect of the optical fiber cable fixture of the present invention, the cover includes a knob that protrudes in a direction parallel to the bottom surface with respect to the fixture body in a state of being attached to the fixture body. For this reason, the cover attached to the fixture main body is easily removed from the fixture main body simply by pulling the knob.

  The optical fiber cable fixture according to claim 12, wherein the holding portion has an inclined opening portion which is opened obliquely with respect to the groove direction in order to insert the optical fiber cable into the holding portion toward the bottom surface of the fixture body. And on the opposite side. For this reason, it is prevented that the optical fiber cable held by the holding part is detached from the holding part.

  The optical fiber cable fixture of claim 13 includes a pair of plate-like portions extending from one end to the other end on the bottom surface. The guide groove is formed between the pair of plate-like portions. The plate-like portion is provided with an anti-centering piece that protrudes toward the guide groove at the end opposite to the bottom surface. For this reason, the optical fiber core wire held in the guide groove is prevented from coming off the guide groove.

  In the optical fiber cable fixing tool according to the fourteenth aspect, the fixing tool main body, the holding tool, the take-out portion, the guide groove and the first locking projection are integrally formed of resin. For this reason, an optical fiber cable fixture can be formed easily.

  In the present invention, an optical fiber cable can be easily and reliably fixed to a communication device such as a surplus length processing device without affecting the transmission characteristics of the optical fiber.

  1 and 2 show a first embodiment of the optical fiber cable fixture of the present invention. The optical fiber cable fixture of this embodiment is used for fixing an optical fiber cable 6 in which a pair of elastic tension members 4 are wired on both sides of the optical fiber core wire 2. The optical fiber core wire 2 and the tension member 4 are coated and integrated with a vinyl chloride resin (PVC) or the like, and a portion of the tension member 4 is separated from the optical fiber core wire 2 by tearing the vinyl chloride resin. Can be separated. This type of optical fiber cable 6 is often used for drawing into a house, and is generally called a drop cable.

  The optical fiber cable fixture is composed of a fixture body 100 and a cover 200. The fixture main body 100 is integrally formed by die molding using, for example, polyphenylene ether resin (PPE) or the like. For this reason, an optical fiber cable fixture having a complicated shape can be easily formed. The fixture main body 100 has a substantially flat rectangular parallelepiped shape, and includes a wall portion 10 provided in the periphery and a bottom surface 12 recessed from the wall portion 10. A step for abutting the outer peripheral portion of the cover 200 is formed in a part of the inside of the wall portion 10. The fixture body 100 is formed with an introduction portion 14 by cutting out the wall portion 10a on the side where the optical fiber cable 6 is introduced. A holding portion 16 having an internal space for holding a separation portion 8 where the optical fiber core wire 2 and the tension member 4 of the optical fiber cable 6 are separated is formed on the bottom surface 12 adjacent to the introduction portion 14. The introduction part 14 side of the holding part 16 and the side opposite to the introduction part 14 are opened for inserting the optical fiber cable 6. An inclined opening 16a that is opened obliquely with respect to a groove direction D of a guide groove 22 to be described later is formed at the end opposite to the bottom surface 12 of the holding portion 16 (upper end in the figure).

  In order to take out the tip end side of the optical fiber core wire 2 separated from the tension member 4 from the fixture main body 100, the fixture main body 100 has a take-out portion 18 by cutting out the wall portion 10b opposite to the wall portion 10a. Is formed.

  On the bottom surface 12 between the introduction portion 14 and the extraction portion 18, a pair of plate-like portions 20a and 20b extending from the introduction portion 14 to the extraction portion 18 and extending on the bottom surface 12 with a predetermined interval are formed. ing. A guide groove 22 in which the optical fiber core wire 2 extending on the fixture main body 100 is accommodated is formed by the space between the plate-like portions 20a and 20b. Plate-shaped decentering prevention pieces 20c and 20d that protrude toward the guide groove 22 are formed at the ends (upper ends in the drawing) opposite to the bottom surface 12 of the plate-shaped portions 20a and 20b, respectively. The plate-like portions 20 a and 20 b function as side walls of the guide groove 22.

  On both sides of the guide groove 22, locking projections 24 (first locking projections) having a rectangular cross section projecting from the bottom surface are formed at four locations on the introduction portion 14 side and the extraction portion 18 side. The protruding end of the locking projection 24 is chamfered. Nearly the center of the plate-like portions 20a and 20b in the groove direction D protrudes on the opposite side of the guide groove 22, and a locking protrusion 26 (first locking protrusion) is integrally formed by these protruding portions. And the meandering embedding groove | channel 23 is formed along the outer side of plate-shaped part 20a, 20b by the latching protrusion 24 and plate-shaped part 20a, 20b (locking protrusion 26). By forming the locking projections 26 by bending the plate-like portions 20a and 20b, the strength of the locking projections 26 can be increased. Therefore, as will be described later, it is possible to prevent the locking protrusions 26 from being damaged when the tension member 4 is embedded (inserted) in the embedded groove 23.

  The locking protrusion 26 is disposed at the center of the pair of locking protrusions 24 arranged in the groove direction D. The locking projection 26 has a locking rib 26 a on the holding portion 16 side at the end opposite to the guide groove 22. The locking rib 26a is formed in a triangular shape with a cross section that is thinner toward the opposite side of the guide groove 22 and has a sharp tip. The end opposite to the bottom surface 12 of the locking rib 26a is chamfered, and is inclined from the guide groove 22 side to the tip side. The protruding height of the locking protrusion 24 is larger than the height of the locking protrusion 26. The height of the holding portion 16 is substantially equal to the protruding height of the locking protrusion 24. The locking protrusions 24 and 26 are formed at positions symmetrical with respect to the central axis of the guide groove 22.

  On the side opposite to the guide groove 22 of the pair of locking projections 24 located on the introduction portion 14 side, engaging portions 28 for locking a locking portion 44 of a cover 200 described later are formed. The engaging portion 28 has a recess 28 a for locking the locking claw 44 a of the locking portion 44.

  The cover 200 has a plate shape corresponding to the bottom surface 12 of the fixture main body 100, and is integrally formed by die molding using, for example, polyacetal resin (POM). A through hole (insertion hole) 40 is formed in the cover 200 at a position corresponding to the locking protrusion 24 of the fixture main body 100. The cover 200 has a position corresponding to between the locking projection 26 and the locking projection 24 positioned on the introduction portion 14 side and between the locking projection 26 and the locking projection 24 positioned on the take-out portion 18 side. A plate-like cable pressing protrusion 42 protruding toward the fixture main body 100 is formed.

The cover 200 is formed with a locking portion 44 that protrudes toward the fixing device main body 100 at a position corresponding to the engaging portion 28 of the fixing device main body 100 and has a locking claw 44a at the tip. A side hole 46 is formed on the side of the locking portion 44. A lightening hole 46 corresponding to the left locking portion 44 in the drawing also serves as the through hole 40. The locking portion 44 has elasticity in a direction orthogonal to the groove direction D (a direction parallel to the cover 200). In particular, by forming the hole 46, the locking portion 44 is easily bent because of its increased elastic force. The cover 200 is formed with a knob 48 that protrudes in a direction orthogonal to the groove direction D (a direction parallel to the cover 200) at the end of the lightening hole 46 that also serves as the through hole 40. The knob 48 is formed with a through hole 48a through which a string or the like is passed in order to prevent the cover 200 from being lost. Further, the cover 200 is formed with a notch 50 for preventing the holding part 16 from colliding when the cover 200 is attached to the fixture main body 100.

  FIG. 3 shows a state in which the optical fiber cable 6 is attached to the fixture main body 100. When attaching the optical fiber cable 6 to the fixture main body 100, first, the tip end side of the optical fiber cable 6 is cut, and the optical fiber core wire 2 and the tension member 4 are separated. The length of the tension member 4 (the length from the separating portion 8 to the tip) is cut to be slightly longer than the length of the fixture body 100 (the vertical direction in the figure).

  Next, the optical fiber core wire 2 is accommodated in the guide groove 22. Here, both of the distal end portions of the decentering prevention pieces 20 c and 20 d overlap the central axis of the guide groove 22. For this reason, the optical fiber core wire 2 stored in the guide groove 22 always overlaps at least one of the core wire disconnection prevention pieces 20c and 20d when viewed from the top regardless of the storage position. Therefore, the optical fiber core wire 2 can be prevented from coming off the guide groove 22 by the core wire disconnection preventing pieces 20c and 20d.

  As the optical fiber core 2 is housed in the guide groove 22, the separation portion 8 of the optical fiber cable 6 is inclined with respect to the axial length direction of the optical fiber core 2 and is inserted into the inclined opening 16 a of the holding portion 16. Is done. The optical fiber cable 6 is configured by arranging tension members 4 on both sides of the optical fiber core wire 2 and has a flat cross section. For this reason, by separating the flat portion, the separation portion 8 can be easily held in the internal space of the holding portion 16 via the inclined opening portion 16a. The opening line of the inclined opening portion 16 a is inclined with respect to the axis of the optical fiber cable 6 held by the holding portion 16. For this reason, it is possible to prevent the optical fiber cable 6 from being detached from the holding portion 16.

  Next, the tension member 4 is bent in a meandering manner along the embedded groove 23 and embedded in the embedded groove 23. In the present invention, the width of the embedded groove 23 formed by the plate-like portions 20a, 20b and the locking projections 24, 26 is set to be larger than the outer diameter of the tension member 4 (for example, about twice the outer diameter). ). Therefore, even when the outer diameter of the tension member 4 intersects, the tension member 4 can be easily embedded in the embedded groove 23.

  After the tension member 4 is embedded in the embedding groove 23, a part of the curved portion of the tension member 4 comes into contact with the locking protrusions 24 and 26 on the inner peripheral side. In particular, the tension member 4 comes into strong contact with the locking rib 26 a protruding from the locking protrusion 26. Since the locking protrusions 24 and the locking ribs 26a are chamfered, when the tension member 4 is embedded in the embedded groove 23, the embedding operation can be facilitated and the operator can be prevented from being injured.

  The optical fiber core wire 2 is not fixed to the fixture main body 100 and is movably held in the guide groove 22. For this reason, the optical fiber core wire 2 is not pressed and deformed by the cover 200 and the fixture main body 100. Therefore, when the optical fiber cable 6 is fixed to the optical fiber fixture, the optical fiber core wire 2 is not distorted by deformation, and the transmission characteristics of the optical signal are not deteriorated. In the present invention, since the tension member 4 can be attached to the fixture main body 100 without screwing or the like, small parts such as screws are not required. Therefore, workability when attaching the optical fiber cable 6 to the fixture main body 100 can be improved.

In this state, when the tension member 4 is pulled toward the introduction portion 14, the tension member 4 tends to deform from a meandering shape to a linear shape. Therefore, the inner peripheral side of the curved portion of the tension member 4 is pressed by the corner portions of the locking projections 24 and 26, and a frictional force is generated at the contact portion between the tension member 4 and the locking projections 24 and 26. In particular, the locking protrusions 24 and 26 and the plate-like portions 20 a and 20 b are formed in a symmetrical shape with respect to the central axis of the guide groove 22. Therefore, the tension force (external force) of the tension member 4 is equally distributed to the tension members 4 on both sides of the guide groove 22, and the force approaching the guide groove 22 side is evenly distributed to each tension member 4 near the separation portion 8. work. Therefore, the frictional forces at the contact portions between the two tension members 4 and the locking projections 24 and 26 are equal to each other. As a result, the fixing force of the tension member 4 to the fixture main body 100 is substantially equal between the left side and the right side of the drawing. Since there is no bias in the fixing force, it is difficult for the tension member 4 to come out to the holding portion 16 side.

  Further, since the locking projection 24 has a rectangular cross section, the corner portion of the locking projection 24 tends to bite into the curved portion of the tension member 4. Further, since the locking protrusion 26 located at the center has the locking rib 26 a, the acute angle portion at the tip of the locking rib 26 a bites into the tension member 4. Therefore, the tension member 4 and the corner portions and the locking rib 26a can reliably prevent the tension member 4 (optical fiber cable 6) from coming out to the holding portion 16 side. That is, it is possible to reliably prevent the tension member 4 from loosening toward the holding portion 16.

  As described above, the optical fiber core wire 2 is not fixed to the fixture main body 100 and is held in the guide groove 22 so as to be movable. For this reason, the optical fiber core wire 2 is not deformed when the tension member 4 is pulled toward the introduction portion 14 side. Therefore, even when the tension member 4 is pulled while the optical signal is transmitted to the optical fiber core wire 2, it is possible to prevent the transmission characteristics of the optical signal from deteriorating.

  FIG. 4 shows a state where the cover 200 is attached to the fixture main body 100 to which the optical fiber cable 6 shown in FIG. 3 is attached. The cover 200 is attached to the fixture main body 100 by locking the locking claw 44 a of the locking portion 44 to the engaging portion 28 of the fixture main body 100. Since the locking portion 44 has elasticity, the cover 200 is placed on the fixture main body 100 and is pressed toward the fixture main body 100 so that the cover 200 is easily attached to the fixture main body 100. Can do. The outer shape of the cover 200 is formed corresponding to the inner peripheral shape of the wall portion 10 of the fixture main body 100 (that is, the shape of the bottom surface 12 shown in FIG. 1). For this reason, the opening part of the fixture main body 100 is covered with the cover 200 by the attachment of the cover 200.

  By attaching the cover 200 to the fixture main body 100, the protruding end of the locking protrusion 24 of the fixture main body 100 is inserted into the through hole 40. The meandering portion of the tension member 4 is pressed toward the bottom surface 12 (not shown) by the cable pressing protrusion 42 of the cover 200. Thereby, the tension member 4 can be prevented from coming off to the cover 200 side. Further, since the protruding end of the locking projection 24 is supported by the through hole 40, the locking projection 24 can be prevented from being damaged by an external force. The cover 200 attached to the fixture main body 100 can be easily removed from the fixture main body 100 simply by pulling the knob 48.

  FIG. 5 shows an example of an optical fiber cable surplus length processing apparatus employing the optical fiber cable fixture of the present invention. In this example, the optical fiber cable surplus length processing apparatus includes a main body 300 and a lid 400. The fixture main body 100 of the optical fiber cable fixture is integrally formed with the main body portion 300 at a position close to the optical fiber cable introduction port in the main body portion 300 of the optical fiber cable surplus length processing apparatus. A string or the like passed through the through hole 48 a of the cover 200 is tied to the main body 300, for example. Thereby, when attaching an optical fiber cable to the fixture main body 100, the loss of the cover 200 can be prevented.

FIG. 6 shows an example in which the extra length processing of the optical fiber cable 6 is performed using the optical fiber cable extra length processing apparatus employing the optical fiber cable fixture of the present invention. From the optical fiber cable 6 attached to the fixture main body 100 to the main body 30 of the optical fiber cable extra length processing apparatus.
The optical fiber core wire 2 introduced into 0 is subjected to surplus length processing by the surplus length processing unit 300b. And the optical plug 500 attached to the front-end | tip of the optical fiber core wire 2 is connected to the optical adapter 600 attached to the main-body part 300, and a surplus length process is completed.

  As described above, in this embodiment, even when the optical signal is transmitted to the optical fiber core wire 2 attached to the optical fiber cable fixture, the transmission characteristic of the optical signal is deteriorated even when the tension member 4 is pulled. Can be prevented. The optical fiber cable 6 can be efficiently attached to the fixture main body 100 without using screws or the like. That is, workability when fixing the optical fiber cable 6 can be improved. Since the optical fiber cable fixture can be configured only by the fixture main body 100 and the cover 200 without using screws or the like, the manufacturing cost of the optical fiber cable fixture can be reduced. In addition, the optical fiber cable fixture can be reduced in size. The frictional force between the locking projections 24 and 26 and the tension member 4 can surely prevent the optical fiber cable 6 from coming off to the holding portion 16 side.

  7 and 8 show a second embodiment of the optical fiber cable fixture of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this embodiment, in the fixture main body 102, the locking protrusions 25 (second projections) are arranged in parallel with the locking protrusions 24 on the outer side (opposite to the guide groove 22) of the pair of locking protrusions 24 positioned on the extraction portion 18 side. Each of the locking projections is formed. The shape of the locking protrusion 25 is the same as that of the locking protrusion 24. The interval between the locking protrusions 24 and 25 is slightly larger than the outer diameter of the tension member 4. Further, the cover 202 has a through hole 41 at a position corresponding to the locking protrusion 25. The structure excluding the locking projection 25 of the fixture main body 102 and the structure excluding the through hole 41 of the cover 202 are the same as those of the fixture main body 100 and the cover 200 of the first embodiment.

  In this embodiment, when there is a possibility that a strong tensile force is applied to the optical fiber cable 6, as shown in FIG. 7, the tip portion of each tension member 4 is formed between the plate-like portions 20 a and 20 b and the locking protrusions 24. Arranged between. This state is the same as in the first embodiment (FIG. 3). That is, when the optical fiber cable 6 is pulled to the introduction portion 14 side, the tip portion of each tension member 4 is connected to the corner portion of the locking projection 24 on the extraction portion 18 side and the locking projection 26 on the extraction portion 18 side. Pressed by the corner. For this reason, the tension member 4 (optical fiber cable 6) can be reliably prevented from coming off to the holding portion 16 side.

  On the other hand, when there is no possibility that a strong pulling force is applied to the optical fiber cable 6, the tip portion of each tension member 4 is disposed between the locking protrusions 24 and 25 as shown in FIG. 8. At this time, the locking projection 25 prevents the curved tension member 4 from opening outward due to the restoring force, and prevents the inner peripheral side of the curved portion of the tension member 4 from separating to the locking rib 26a. That is, even when the tension member 4 is not disposed between the plate-like portions 20a and 20b and the locking projection 24, the locking projection 25 reduces the frictional force between the locking rib 26a and the tension member 4. Can be prevented. That is, the tension member 4 can be securely bited into the locking rib 26a.

  When the optical fiber cable 6 is pulled toward the introduction portion 14 in this state, the tension member 4 is pressed by the corner portion of the engagement protrusion 24 positioned on the introduction portion 14 side and the engagement rib 26a, so that the take-out portion 18 is removed. The corners of the locking protrusions 24 on the side and the corners of the locking protrusions 25 on the extraction part 18 side are not pressed. Therefore, the fixing force of the tension member 4 against the pulling force is weaker than that in FIG. However, since the number of times the tension member 4 is bent can be reduced, workability when the optical fiber cable 6 is attached to the fixture body 102 can be further improved.

As mentioned above, also in 2nd Embodiment, the effect similar to 1st Embodiment can be acquired. Further, in this embodiment, by forming the locking protrusion 25, the tension member 4 can be reliably brought into contact with the locking rib 26a even when the tension member 4 is attached in the state shown in FIG. As a result, it is possible to reliably prevent the optical fiber cable 6 from being detached from the fixture body 102 against the pulling force of the optical fiber cable 6 toward the introduction portion 14 side. Moreover, workability when attaching the optical fiber cable 6 to the fixture main body 102 can be further improved.

  In the above-described embodiment, the number of the locking protrusions 24 and 26 arranged along the groove direction is not limited to three, and may be four or more. The through hole 40 formed in the cover 200 may be a recess into which the tip of the locking protrusion 24 is inserted.

  In the above-described embodiment, the through hole 40 and the cable pressing protrusion 42 are formed in the cover 200. However, even if only one of the through hole 40 and the cable pressing protrusion 42 is formed, the tension member 4 can be detached from the cover 200 side. Can be prevented.

  In order to bend the tension member 4 in the protruding direction of the locking protrusion 24 in a region excluding the portion corresponding to the cable pressing protrusion 42 of the cover 200 on the bottom surface 12, a raised portion may be formed. In this case, the tension member 4 bends not only in the direction parallel to the bottom surface 12 but also in the direction perpendicular to the bottom surface 12, so that the tension member 4 can be more securely fixed to the fixture main bodies 100 and 102.

  If the locking protrusions 24 and 26 are rectangular in cross section, the optical fiber cable 6 can be prevented from being detached from the fixture main body 102 without forming the locking rib 26a. Further, the locking rib 26 a may be formed not only on the introduction portion 14 side of the locking projection 26 but also on the take-out portion 18 side of the locking projection 26. Furthermore, the locking projection 26a may be formed on the take-out portion 18 side of the locking projection 24 positioned on the introduction portion side.

  As mentioned above, although this invention was demonstrated in detail, said embodiment and its modification are only examples of this invention, and this invention is not limited to this. Obviously, modifications can be made without departing from the scope of the present invention.

  The present invention can be applied to communication equipment such as an extra length processing device for an optical fiber cable in order to fix the optical fiber cable.

It is a perspective view which shows 1st Embodiment of the optical fiber cable fixing tool of this invention. It is a perspective view which shows the detail of the cover shown in FIG. It is a front view which shows the state which attached the optical fiber cable to the fixing tool main body shown in FIG. It is a front view which shows the state which attached the cover to the fixing tool main body to which the optical fiber cable of FIG. 3 was attached. It is a perspective view which shows the example of the optical fiber cable surplus length processing apparatus which employ | adopted the optical fiber cable fixing tool of this invention. It is a front view which shows the example which performs the extra length process of an optical fiber cable using the optical fiber cable extra length processing apparatus which employ | adopted the optical fiber cable fixing tool of this invention. It is a perspective view which shows 2nd Embodiment of the optical fiber cable fixing tool of this invention. FIG. 8 is a perspective view showing another example of attaching an optical fiber cable in the fixture main body shown in FIG. 7.

Explanation of symbols

2 Optical fiber core wire 4 Tension member 6 Optical fiber cable 8 Separation portion 10 Wall portion 12 Bottom surface 14 Introduction portion 16 Holding portion 18 Extraction portions 20a and 20b Plate-like portions 20c and 20d Core wire disconnection prevention piece 22 Guide groove 23 Embedded groove 24 , 25, 26 Locking protrusion 26a Locking rib 28 Engagement part 40, 41 Through hole 42 Cable pressing protrusion 44 Locking part 46 Lightening hole 48 Knob part 50 Notch 100, 102 Fixing body 200, 202 Cover

Claims (14)

An optical fiber core and a pair of elastic tension members provided on both sides of the optical fiber are integrated with resin, and a part of the tension member can be separated from the optical fiber by cutting the resin. An optical fiber cable fixture for fixing an optical fiber cable,
A fixture body having a bottom surface recessed from the surroundings;
A holding portion that is formed at one end of the fixing device main body on the introduction side of the optical fiber cable and holds a separation portion where the optical fiber core and the tension member of the optical fiber cable are separated;
A take-out portion formed at the other end of the fixture main body and extending from the holding portion to the outside of the fixture main body;
On the bottom surface of the fixture main body, a guide groove that is formed to hang from the one end to the other end, and that accommodates an optical fiber core wire extending on the fixture main body,
Formed at intervals along the groove direction on both sides of the guide groove on the bottom surface of the fixture main body, and comes into contact with the inner peripheral side of the bending portion of each tension member that is separated from the separation portion and bent in a meandering manner. An optical fiber cable fixture comprising a plurality of first locking projections for causing the optical fiber cable to be fixed. The optical fiber cable fixture according to claim 1,
Three first locking protrusions are formed on each side of the guide groove,
The first locking protrusion at the center of each first locking protrusion row arranged in the groove direction is formed integrally with the side wall and the bottom surface with the side wall of the guide groove protruding outward. Fiber optic cable fixture. The optical fiber cable fixture according to claim 2,
The optical fiber cable fixture according to claim 1, wherein the first locking protrusion at the center includes a locking rib protruding toward the inner peripheral side at a position where the inner peripheral side of the bending portion contacts. The optical fiber cable fixture according to claim 3,
An end of the locking rib opposite to the bottom surface is chamfered. The optical fiber cable fixture according to claim 2,
On the bottom surface of the fixture main body, a second locking protrusion formed in parallel with the first locking protrusion is provided on the opposite side of the guide groove of the first locking protrusion located on the other end side. Prepared,
An optical fiber cable fixture, wherein a distance between the juxtaposed first and second locking projections is larger than an outer diameter of the tension member. The optical fiber cable fixture according to claim 1,
The first locking protrusion protruding from the bottom surface is formed in a rectangular cross section,
An optical fiber cable fixing tool, wherein the protruding ends of the first locking projections are chamfered. The optical fiber cable fixture according to claim 1,
The optical fiber cable fixture according to claim 1, wherein the first locking protrusion is formed at a symmetrical position about the guide groove. The optical fiber cable fixture according to claim 1,
A plate-like cover arranged to cover the opening facing the bottom surface of the fixture body;
The cover is provided with an insertion hole into which the protruding end of the first locking projection protruding from the bottom surface is inserted when the cover is attached to the fixing tool body. The optical fiber cable fixture according to claim 8,
In order to press the meandering portion of the tension member against the bottom surface of the fixture main body at a position corresponding to the position between the first locking projections arranged in the groove direction on the surface facing the fixture main body, An optical fiber cable fixture having a cable pressing projection protruding toward the fixture body. The optical fiber cable fixture according to claim 8,
The cover includes a locking portion projecting toward the fixture body on a surface facing the fixture body,
The optical fiber cable fixture according to claim 1, wherein the fixture body includes an engaging portion for locking the locking portion on the bottom surface. The optical fiber cable fixture according to claim 10,
The optical fiber cable fixture according to claim 1, wherein the cover includes a knob that protrudes in a direction parallel to the bottom surface with respect to the fixture body in a state of being attached to the fixture body. The optical fiber cable fixture according to claim 1,
The holding portion includes an inclined opening that is opened obliquely with respect to the groove direction on the side opposite to the bottom surface in order to insert an optical fiber cable into the holding portion toward the bottom surface of the fixture body. An optical fiber cable fixture characterized by comprising: The optical fiber cable fixture according to claim 1,
A pair of plate-like portions extending from the one end on the bottom surface to the other end;
The guide groove is formed between the pair of plate-like portions,
The optical fiber cable fixture according to claim 1, wherein the plate-like portion includes an off-core wire prevention piece protruding toward the guide groove at an end opposite to the bottom surface. The optical fiber cable fixture according to claim 1,
The optical fiber cable fixture, wherein the fixture body, the holder, the take-out portion, the guide groove, and the first locking projection are integrally formed of resin.

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