JP4235159B2 - Optical fiber cord piping system - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe line connecting device for passing an optical fiber cord as an optical communication line through a cylindrical pipe installed in a building when wiring an optical communication line in a building.

  In recent years, with the spread of the Internet to ordinary households, optical fibers are becoming popular as data transmission paths capable of high-speed and large-capacity data communication. When wiring an optical fiber cord in a building, piping laid in the building may be used from the viewpoint of protecting the optical fiber cord (see, for example, Patent Document 1).

  By the way, when wiring in a building, it was necessary to cut the optical fiber cord to the required length and attach the optical connector to the end, but this work was performed by skilled workers such as expensive optical fiber cutters. It had to be performed using a dedicated jig, and the work efficiency was low. The optical fiber cord has a minimum bend radius that does not impair transmission loss, and the remaining part needs to be bundled so that it does not fall below the minimum bend radius (extra length process), further reducing work efficiency. Was.

In contrast, an optical fiber cord (hereinafter referred to as an “optical curl cord”) in which at least a part of the length direction is spirally curled and an optical connector is attached to each end of the non-curl portion at both ends in the length direction. Is starting to be offered. As shown in FIG. 13, if such an optical curl cord 120 is wired in a pipe 110, it becomes possible to handle various lengths of the pipe 110 within a range in which the optical curl cord 120 expands and contracts. The work of cutting the cord 120 and attaching the optical connector 121 is reduced or unnecessary. Here, in consideration of the allowable tension of the optical connector 121 and the frictional force at the time of wiring, it is known that the optical connector 121 can be gripped and connected.
JP 2003-125520 A

  However, since the optical curl cord that has been passed through the pipe tends to shrink due to the restoring force generated in the curled portion, the end of the optical curl cord or the optical connector attached to the end is pulled into the pipe. In some cases, the work may be hindered when the optical curl cord is connected to a device in the building.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical fiber cord piping device that prevents the optical fiber cord from being pulled back into the piping.

In order to achieve the above object, the invention of claim 1 is for passing an optical fiber cord as an optical communication line through a cylindrical pipe laid in the building when the optical communication line is wired in the building. A pipe connection device, at least a part of the length direction of the optical fiber cord consisting of an optical curled cord curled spirally, or a holding portion for holding an optical connector attached to the end; A return prevention jig having a support part for supporting the holding part in a state where at least a part of the pipe is inserted from an end part of the pipe, and an insertion part inserted into a curled part of the optical fiber cord; and a cord receiving jig at both ends in the longitudinal direction of the optical fiber cord in the inner insertion portion and a retaining portion for retaining the optical fiber cord is accommodated in the pipe, the return prevention jig Sandwiching member includes a plurality of support pieces projecting from one end of the holding portion to the rear, respectively, along with their spacing is arranged so as to extend with increasing distance from the holding portion, you are formed to freely deflectable in a direction toward each other The insertion portion of the cord housing jig is formed in a cylindrical shape having both ends opened, and the retaining portion of the cord housing jig is a short cylindrical press-fit portion that is press-fitted into the end portion of the insertion portion. And a disc-shaped collar provided on one end of the press-fitting part, and a plurality of claws that project parallel to the press-fitting part from the periphery of the collar and hook the optical fiber cord. The part is formed with a plurality of grooves into which the optical fiber cords are inserted .

  The invention of claim 2 is the invention of claim 1, wherein the end of the optical fiber cord or the holding part for holding the optical connector, and a connection part to which a nominal line for pulling the optical fiber cord is connected, A pulling jig having a holding portion and a connecting portion for connecting the connecting portion so as to be rotatable at least in a plane substantially orthogonal to the pulling direction is provided.

A third aspect of the present invention is the main body part of the first or second aspect, wherein one opening diameter is larger than the inner diameter of the pipe and the other opening diameter is the same as or smaller than the inner diameter of the pipe. And a feed jig having a fixing portion provided on the small diameter opening side of the main body portion and fixed to the end portion of the pipe .

According to the first aspect of the present invention, if the holding portion of the return prevention jig holds the end portion of the optical fiber cord (optical curl cord) or the optical connector and the support portion is inserted into the inside from the end portion of the pipe, The prevention jig can prevent the optical fiber cord from being pulled back into the pipe, improving the workability of the wiring work by the pipe wiring device , and the optical fiber cord that has not been inserted into the pipe after passing through the pipe The cord receiving jig is inserted with the insertion portion of the cord receiving jig inserted into the extra length portion of the optical fiber cord, and the optical fiber cord is prevented from being removed by the retaining portion at both ends along the longitudinal direction of the optical fiber cord in the inserting portion. Is accommodated in the pipe, the extra length portion of the optical fiber cord can be smoothly accommodated in the pipe, and the occurrence of problems due to expansion and contraction of the extra length portion can be prevented .

  According to the second aspect of the present invention, the end of the nominal line previously passed through the pipe is connected to the connecting portion of the traction jig and the end of the optical fiber cord (optical curl cord) or the optical connector is held by the holding portion. In this state, if the nominal line is pulled out of the pipe from the opposite side, the optical fiber cord is pulled through the pulling jig connected to the nominal line and passed through the pipe. Since the connecting portion that connects the two members is rotatable at least in a plane that is substantially orthogonal to the pulling direction, the twist generated in the optical fiber cord during towing can be returned by turning the connecting portion.

According to the invention of claim 3, when the optical fiber cord is inserted from the end portion of the pipe, the optical fiber cord is inserted through the funnel-shaped main body portion fixed to the end portion of the pipe by the fixing portion. There is an effect that the cord can be smoothly inserted into the pipe .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
The pipe passing device of the present embodiment includes a pulling jig A, a feeding jig B, a return preventing jig C, and a cord housing jig D.

  As shown in FIG. 3, the pulling jig A is connected to a holding unit 1 that holds an optical connector 101 attached to an end of the optical curl cord 100 and a call line 102 for pulling the optical curl cord 100. It has the connection part 2, and the connection part 3 which connects the holding | maintenance part 1 and the connection part 2 so that rotation is possible at least within the plane substantially orthogonal to a pulling direction.

  The holding portion 1 is formed in a rectangular tube shape having one end opened with a synthetic resin, and holds the optical connector 101 press-fitted into the inside through the opening. However, the method by which the holding unit 1 holds the optical connector 101 is not limited to press-fitting, and other known methods may be used. A through hole 1a is provided in the center of the bottom wall of the holding portion 1, and a spherical recess 1b is formed around the through hole 1a on the inner bottom surface. The through-hole 1a is formed in a tapered shape so that the outer opening diameter is larger than the inner opening diameter.

  The connecting portion 2 has an ellipsoidal main body 2a and a semicircular connecting ring 2b projecting to the center on one surface side of the main body 2a, and is connected to the connecting ring 2b by connecting the end of the calling line. . The connecting portion 3 includes a columnar support 3a that protrudes in the center on the opposite side of the connection ring 2b in the main body 2a of the connection portion 2, and a bowl-shaped portion that forms part of a sphere, and the support 3a at the center of the spherical surface. And a rotating body 3b coupled to the front end. In addition, the connection part 2 and the connection part 3 are integrally comprised by the metal material, for example. Then, by inserting the support body 3a through the through hole 1a of the holding section 1 so that the rotating body 3b is housed inside the holding section 1, a plane substantially perpendicular to the pulling direction (the direction of arrow A in FIG. 3) is obtained. The holding portion 1 and the connecting portion 2 are connected by the connecting portion 3 so as to be freely rotatable. Further, since the recess 1b is formed on the inner bottom surface of the holding portion 1 and the through hole 1a through which the support 3a is inserted is formed in a tapered shape, as shown in FIGS. 3 (a) to 3 (c). In addition, the connecting portion 2 is rotatable with respect to the holding portion 1 even in a plane substantially parallel to the pulling direction.

  Thus, the end of the nominal line previously connected to the pipe 110 is connected to the connection ring 2b of the connection part 2 of the traction jig A and connected while the optical connector 101 is held by the holding part 1. Is pulled out of the pipe from the opposite side, the optical curl cord 100 is pulled through the pipe 110 via the pulling jig A connected to the nominal line. Here, when the holding portion 1 and the connecting portion 2 are fixed, the optical curl cord 100 is twisted during towing, and the optical curl cord 100 is bent to a minimum bending radius or less due to the twist. However, in this embodiment, the connecting portion 3 that connects the holding portion 1 and the connecting portion 2 can be rotated in a plane substantially orthogonal to the pulling direction (the direction of arrow A in FIG. 3). Therefore, the twist generated in the optical curl cord 100 during towing can be returned by turning the connecting portion 3. Further, since the connecting portion 2 is rotatable with respect to the holding portion 1 even in a plane substantially parallel to the pulling direction, the piping 110 is bent as shown in FIGS. 3 (a) and 3 (c). The pulling jig A can smoothly pass through the bent portion of the pipe 110 by turning the connecting portion 2.

  By the way, as shown in FIG. 4, the part other than the bottom wall in the holding portion 1 is divided into two in the axial direction to form half-columnar halves 1c and 1d, and one half that is integral with the bottom wall. It is good also as a structure which connects 1c and the other half-divided body 1d so that opening and closing is possible by the thin part 1e. The coupling surfaces of the two halves 1c and 1d are respectively provided with fitting grooves 1f and 1g into which the optical connector 101 is fitted, and the optical connector 101 is inserted into the fitting groove 1f of one of the halves 1c. If the other half-divided body 1d is closed in the fitted state and the optical connector 101 is fitted into the fitting groove 1g, the holding unit 1 can hold the optical connector 101. With such a configuration, there is an advantage that the work of holding the optical connector 101 in the holding unit 1 becomes easy. Although not shown in the figure, the two halves 1c and 1d are provided with a well-known lock mechanism that is locked in a coupled state.

  Next, the feeding jig B will be described.

  When the optical curl cord 100 is pulled by the nominal line through the pulling jig A, the optical curl cord 100 that is fed into the pipe 110 comes into contact with the edge of the pipe 110, so that the feeding resistance increases. There is a possibility that the traction force increases and the burden on the optical curled cord 100 increases, or that the outer sheath of the optical curled cord 100 is damaged at the edge of the pipe 110 (see FIG. 5).

  Therefore, in this embodiment, a feeding jig B is provided for reducing resistance when the optical curl cord 110 is fed into the pipe 110 and preventing the outer curl cord 100 from being damaged. As shown in FIG. 6, the feeding jig B includes a main body 10 formed in a funnel shape in which one opening diameter is larger than the inner diameter of the pipe 110 and the other opening diameter is smaller than the inner diameter of the pipe 110. A fixing portion that is provided on the small diameter opening side of the portion 10 and is fixed to the end of the pipe 110. The fixed portion is a cylindrical small-diameter portion 11 inserted into the pipe 110 and a cylindrical large-diameter portion that is externally inserted into the end portion of the pipe 110 and holds the end portion of the pipe 110 between the small-diameter portion 11. Twelve. In addition, the main-body part 10, the small diameter part 11, and the large diameter part 12 are integrally formed as a synthetic resin molded product.

  Thus, as shown in FIG. 7, the feeding jig B is fixed to the end of the pipe 110 by inserting the small diameter part 11 into the pipe 110 and simultaneously inserting the large diameter part 12 into the end of the pipe 110. The optical curl cord 110 is fed into the pipe 110 through the main body 10 of the feeding jig B. Since the main curled portion 10 into which the optical curl cord 110 is fed is formed in a funnel shape, the optical curl cord 110 has an end edge. The optical curl cord 100 can be smoothly inserted into the pipe 110, and the load on the optical curl cord 100 is increased by increasing the pulling force of the nominal line, or the optical curl at the edge of the pipe 110. It is possible to prevent the occurrence of defects such as scratches on the jacket of the cord 100.

  Next, the return prevention jig C will be described.

  As described in the prior art, since the optical curl cord 100 passed through the pipe 110 tends to shrink due to the restoring force generated in the curled portion, the optical connector 101 attached to the end of the optical curl cord 100 is connected to the pipe. In some cases, the optical curl cord 100 may be drawn into the apparatus 110, and the work may be hindered when the optical curl cord 100 is connected to equipment in the building.

  Therefore, in the present embodiment, a return prevention jig C for preventing the optical curl cord 100 from being pulled back into the pipe 110 is provided. As shown in FIG. 2, the return prevention jig C includes a holding portion 20 that holds the optical connector 101 and a support portion that supports the holding portion 20 while being inserted into the pipe 110 from the end. The holding portion 20 is formed in a cylindrical shape having an opening diameter larger than the outer diameter of the optical curl cord 100 and smaller than the outer diameter of the optical connector 101, and is provided with a longitudinal groove 20a extending inward and outward along the axial direction. It has been. The support part is composed of four support pieces 21 that protrude rearward from one opening edge of the holding part 20, and is arranged so that the distance between the support pieces 21 increases as the distance from the holding part 20 increases. Here, the holding part 20 and the support piece 21 are integrally formed as a synthetic resin molded product, and the four support pieces 21 can be freely bent toward each other.

  Thus, as shown in FIGS. 1A and 1B, the optical connector 101 is held by holding the tip portion of the optical curl cord 100 passed through the pipe 110 into the holding portion 20 through the vertical groove 20a. When the support piece 21 is bent and inserted into the pipe 110 while being held at 20, the tip of the support piece 21 that is to be returned to the original in the pipe 110 is uneven in the inner wall of the pipe 110. Since it is caught (refer to FIG. 1C), the return curling jig C can prevent the optical curl cord 100 from being pulled back into the pipe 110, thereby improving the workability of the line work. Note that the method of hooking the return prevention jig C onto the end of the pipe 110 by expanding the tip of the support piece 21 larger than the inner diameter of the pipe 110 is obvious.

  Finally, the cord housing jig D will be described.

  When a surplus (extra length portion) is generated in the optical curl cord 110 passed through the pipe 110, the extra length portion needs to be accommodated in the pipe 110. However, since the optical curl cord 110 has a characteristic of expanding and contracting in the longitudinal direction, the extra length portion may not be accommodated smoothly in the pipe 110 in some cases.

  Therefore, in this embodiment, a cord housing jig D for smoothly housing the extra length portion of the optical curl cord 110 in the pipe 110 is provided. As shown in FIGS. 8 and 9, the cord housing jig D is inserted along the curled portion of the optical curl cord 100, and the longitudinal direction of the optical curl cord 100 in the insertion portion 30. There are retaining portions 31 and 31 for retaining the optical curl cord 100 at both ends. The insertion part 30 is formed in a cylindrical shape having both ends opened by a synthetic resin. The retaining portion 31 includes a short cylindrical press-fit portion 31a that is press-fitted into the end portion of the insertion portion 30, a disc-shaped flange portion 31b provided on one end side of the press-fit portion 31a, and a flange portion 31b. A plurality of (four) claws 31d that protrude in parallel with the press-fit portion 31a from the periphery and hook the optical curl cord 110 are integrally formed as a synthetic resin molded product. A plurality of (three) grooves 31c through which the optical curl cord 110 is inserted are formed in the collar portion 31b.

  Thus, as shown in FIG. 9 (a), after inserting the insertion part 30 into the extra length part (curled part) of the optical curl cord 110, the press-fitting parts 31 a are press-fitted into both end openings of the insertion part 30. Then, the retaining portion 31 is attached, and the optical curl cord 110 is accommodated in the cord accommodation jig D by being inserted into one of the grooves 31c after being hooked on the claw 31d as shown in FIG. 9B. As shown in (c), if the cord housing jig D that houses the optical curl cord 110 is inserted into the pipe 110, the extra length portion of the optical curl cord 100 can be smoothly accommodated in the pipe 110 and the extra length portion expands and contracts. It is possible to prevent the occurrence of problems due to the operation.

(Embodiment 2)
This embodiment is characterized by the structure of the traction jig A, and the other configuration is the same as that of the first embodiment.

  As shown in FIG. 10, the pulling jig A in the present embodiment includes a connecting portion 5 to which a holding portion that holds the optical curl cord 100 and the optical connector 101 and a nominal line 102 for pulling the optical curl cord 100 are connected. And a connecting portion 6 that connects the holding portion 4 and the connecting portion 5 so as to be rotatable in a plane substantially orthogonal to the pulling direction. The holding part is composed of a pair of holding bands 4a and 4b formed in a band shape with cloth, vinyl tape or the like, and is wound around the optical curl cord 100 and the optical connector 101 in a spiral shape to hold both. However, it is desirable that the holding bands 4a and 4b are wound in opposite directions. The connecting portion 5 has a disk-shaped main piece 5a and a semi-circular connecting ring 5b provided on one surface side of the main piece 5a, and the end of the nominal line 102 is connected to the connecting ring 2b. Connected. The connecting portion 6 includes a disc-shaped main piece 6 a, a semi-circular connecting ring 6 b provided on one surface side of the main piece 6 a to which the ends of the holding bands 4 a and 4 b are connected, and a main portion of the connecting portion 5. There is a connecting fitting 6c that is inserted through an insertion hole that penetrates through the center of the piece 5a and an insertion hole that penetrates through the center of the main piece 6a, and connects the main pieces 5a, 6a to each other in a freely rotatable manner.

  Thus, by connecting the end of the nominal line 102 previously passed through the pipe 110 to the connection ring 5b of the connection part 5 of the traction jig A and connecting the holding bands 4a and 4b in the opposite directions, the light can be obtained. If the nominal line 102 is pulled out of the pipe from the opposite side while the curl cord 110 and the optical connector 101 are held, the optical curl cord 100 is pulled through the pulling jig A connected to the nominal line 102 and the pipe. 110 is connected. Since the main piece 5a of the connecting piece 5 and the main piece 6a of the connecting portion 6 are rotatable in a plane substantially perpendicular to the pulling direction by the connecting portion 6, the optical curled cord 100 is generated during towing. The twist can be returned.

(Embodiment 3)
The present embodiment is characterized by the structure of the return prevention jig C, and the other configurations are the same as those in the first or second embodiment.

  As shown in FIG. 11, the return prevention jig C in the present embodiment includes a holding portion 22 that holds the optical connector 101 and a support portion 23 that supports the holding portion 22 while being inserted from the end of the pipe 110. And have. The holding portion 22 includes a disk-shaped large-diameter piece 22a and a cylindrical small-diameter piece 22b having an outer diameter smaller than that of the large-diameter piece 22a and protruding from one surface of the large-diameter piece 22a. The central axis of 22a and the small diameter piece 22b is provided with an insertion hole 22c through which the end of the optical connector 101 and the end of the optical curl cord 110 are inserted, and a vertical groove 22d leading to the insertion hole 22c extends along the axial direction. The large diameter piece 22a and the small diameter piece 22b are formed. The support portion 23 is a columnar shape having an outer diameter that is not smaller than the inner diameter of the pipe 110 and is connected to a main body 23a connected to the small-diameter piece 22b of the holding portion 22 and a truncated cone-shaped insertion provided at the tip of the main body 23a. The body 23b is provided with an insertion hole 23c through which the end of the optical curl cord 110 is inserted in the central axis of the main body 23a and the insertion body 23b, and the longitudinal groove of the holding portion 22 communicates with the insertion hole 23c. A longitudinal groove 23d connected to 22d in a straight line is formed in the main body 23a and the insertion body 23d along the axial direction. The holding portion 22 and the support portion 23 are integrally formed as a synthetic resin molded product.

  Thus, as shown in FIGS. 11 (a) and 11 (b), the leading end portion of the optical curl cord 100 passed through the pipe 110 is inserted through the longitudinal grooves 22d and 23d through the holding portions 22 and the insertion holes 22c and 23c of the support portion 23. In the state where the optical connector 101 is held by the holding part 22 by being inserted into the pipe 110, the plug 23b of the support part 23 is inserted into the pipe 110 and the main body 23a is press-fitted into the end of the pipe 110 (see FIG. 11 (c)), the return curling jig C can prevent the optical curl cord 100 from being pulled back into the pipe 110.

(Embodiment 4)
The present embodiment is characterized by the structure of the return prevention jig C, and the other configurations are the same as those in the first or second embodiment.

  As shown in FIG. 12, the return prevention jig C in the present embodiment is formed in a flat box shape whose side surface is open, and is provided on the front surface adjacent to the opening surface so that the optical curl cord 110 is inserted. The holding groove 24 has a substantially circular pipe fixing hole 25 provided on the back surface adjacent to the opening surface and facing the front surface, into which the end of the pipe 110 is inserted and fixed.

  Thus, as shown in FIGS. 12A and 12B, the optical connector 101 is held by passing the tip portion of the optical curl cord 100 passed through the pipe 110 through the holding groove 24 and the pipe fixing hole 25. By inserting the end of the pipe 110 into the pipe fixing hole 25 and locking and fixing the peripheral edge of the pipe fixing hole 25 to the valley portion on the outer peripheral surface of the bellows-like pipe 110 (see FIG. 12C), light The return prevention jig C can prevent the curl cord 100 from being pulled back into the pipe 110.

(A)-(c) is the perspective view which abbreviate | omitted partially for demonstrating the usage method of the return prevention jig | tool in Embodiment 1. FIG. It is a perspective view of a return prevention jig same as the above. (A)-(c) is sectional drawing which abbreviate | omitted one part for demonstrating the usage method of the traction jig | tool in the same as the above. The pulling jig | tool of another structure is shown, (a) is a front view, (b) is a right view. It is the perspective view which showed the state which sends an optical curl cord in piping. The feed jig | tool in the same as above is shown, (a) is a perspective view, (b) is sectional drawing of the state fixed to piping. (A) (b) is the perspective view which abbreviate | omitted partially for demonstrating the usage method of the feeding jig | tool in the same as the above. It is a top view of the cord accommodation jig | tool in the same as the above. (A)-(c) is the perspective view which abbreviate | omitted one part for demonstrating the usage method of the code | cord | chord accommodation jig | tool in the same as the above. It is a perspective view of the traction jig in Embodiment 2. (A)-(c) is the perspective view which abbreviate | omitted one part for demonstrating the usage method of the return prevention jig | tool in Embodiment 3. FIG. (A)-(c) is the perspective view which abbreviate | omitted one part for demonstrating the usage method of the return prevention jig | tool in Embodiment 4. FIG. It is the schematic which shows the mode of the prior | preceding wiring of the optical fiber cord using piping to a general house.

Explanation of symbols

C Return prevention jig 20 Holding part 21 Supporting piece 100 Optical curl cord 101 Optical connector 110 Piping

Claims (3)

A pipe passing device for passing an optical fiber cord as an optical communication line to a cylindrical pipe laid in the building when wiring the optical communication line in the building, and at least part of the length direction A state in which at least a part of the optical fiber cord made of an optical curled cord curled in a spiral shape or a holding portion for holding an optical connector attached to the end is inserted from the end of the pipe into the inside The anti-returning jig having a support portion for supporting the holding portion, an insertion portion inserted into the curled portion of the optical fiber cord, and the longitudinal direction of the optical fiber cord in the insertion portion And a cord housing jig accommodated in the pipe having a retaining portion for retaining the optical fiber cord at both ends, and the support portions of the return prevention jig are respectively provided from one end of the holding portion. Protruding backward That a plurality of support pieces, with their spacing is arranged so as to extend with increasing distance from the holding unit, Ri Na are formed freely deflectable in the direction of approaching each other, the inner insertion portion of said cord receiving jig, Both ends are formed in a cylindrical shape, the retaining portion of the cord housing jig is a short cylindrical press-fit portion that is press-fitted into the end portion of the insertion portion, and a disc that is provided on one end side of the press-fit portion And a plurality of claws that project in parallel with the press-fit portion from the periphery of the flange and hook the optical fiber cord, and a plurality of grooves through which the optical fiber cord is inserted. An optical fiber cord pipe passing device characterized in that is formed .   An end of the optical fiber cord or a holding portion for holding the optical connector, a connecting portion to which a nominal line for pulling the optical fiber cord is connected, and at least rotatable within a plane substantially orthogonal to the pulling direction The optical fiber cord pipe passing device according to claim 1, further comprising a pulling jig having the holding portion and a connecting portion for connecting the connecting portion. A main body formed in a funnel shape having one opening diameter larger than the inner diameter of the pipe and the other opening diameter equal to or smaller than the inner diameter of the pipe, and provided on the small diameter opening side of the main body section. 3. The optical fiber cord pipe passing device according to claim 1, further comprising a feeding jig having a fixing portion fixed to the end of the optical fiber cord .

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