JP2008033013A - Processing device of marginal length of optical cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it easy to process and store the marginal length of an optical cable. <P>SOLUTION: A cylindrical container with a bottom plate has: a take up part 11 having a radius of curvature which is equal to or larger than the allowable minimum bending radius of the optical fiber cable; a reel 1 provided with a pair of flanges 12 and 13 interposing the take up part 11; and an open part having a shape compatible to the flanges 12 and 13, wherein the reel 1 on which the marginal length part Y of the optical cable is wound is housed from the open part. The container is further provided with a reel case 2 on which a notch 23 which communicate with the open part is formed and a fixing member 3 which fixes the reel 1 in the reel case 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical cable surplus length processing tool.

For example, there is a surplus length processing device disclosed in Patent Document 1 for storing the surplus length portion of the optical cable. This surplus length processing device is provided with an inner cylinder and an outer cylinder concentrically with the inner cylinder and covering the outer peripheral surface of the inner cylinder, which are fixedly provided in the housing. An optical fiber cable is accommodated in a space between the inner peripheral surface of the outer cylinder.
JP-A-6-109930

  By the way, the surplus length processing apparatus of the above-mentioned patent document 1 has a problem that the routing of the optical fiber cable in the housing is complicated, and therefore the workability in the surplus length processing is poor. In addition, as is well known, although the transmission performance deteriorates when the optical fiber cable is excessively bent, the conventional extra length processing apparatus has a complicated routing of the optical fiber cable in the housing. The optical fiber cable may be excessively bent to deteriorate the transmission performance.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to facilitate the extra length processing of the optical cable and the storing operation of the extra length portion.

  In order to solve the above problems, in the present invention, as a first means, a winding portion having a radius of curvature equal to or larger than an allowable minimum bending radius of an optical fiber cable, and a pair of flanges provided across the winding portion And a bottomed cylindrical container for housing the reel around which an optical fiber cable is wound, the notch communicating with the opening. A reel case including a reel case and a fixing member for fixing the reel in the reel case are employed.

  Further, as a second means, in the first means, the reel has a through-hole formed in the shaft center so as to penetrate both flanges, and the reel case in a state of being accommodated in the reel case. A recess formed in the center of the flange facing the bottom and communicating with the through-hole and having a larger diameter than the through-hole, and the reel case has an outer shape matching the recess and has an axial center The fixing member is inserted into the through-hole from the flange on the opening side in a state where the reel is housed in the reel case, and a tip is screwed into the screw hole. We adopted a male screw that matches.

  As a third means, in the second means, the protrusion has the screw hole in the vicinity of the bottom portion, and has a cavity communicating with the screw hole inside and communicates with the cavity at the top portion. And a spring that is housed in the recess and urges the top of the protrusion in a direction to push out from the recess.

  According to the present invention, the extra length portion of the optical fiber cable is wound around the winding portion of the reel, the reel is housed in the reel case, and fixed by the fixing member, so that the optical fiber cable is connected to the reel case and the flange of the reel. Therefore, the excess length of the optical cable can be easily processed and the excess length portion can be protected.

Hereinafter, an embodiment of an optical cable surplus length processing tool of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a surplus length processing tool in the present embodiment, FIG. 2 is a longitudinal front view showing the structure of the surplus length processing tool, and FIG. 3 shows an optical cable S attached to the surplus length processing tool. It is a top view which shows the state which accommodated the extra length part Y of. The extra length processing tool includes a reel 1, a reel case 2, a screw 3 and a spring 4.
The optical cable S is a state in which a protective coating is applied to the optical fiber cable H, and the allowable minimum bending radius of the optical cable S is several tens of centimeters, and the allowable minimum bending radius of the optical fiber cable H is several centimeters. The extra length Y of the optical cable S is removed from the protective coating to form an optical fiber cable H, which is stored in the extra length processing tool.

The reel 1 is shaped like a constricted pulley by forming a C-shaped groove on the outer peripheral surface of a cylinder having a large diameter and a low height, and is wound around the optical fiber cable H. A portion 11 and a pair of flanges 12 and 13 sandwiching the upper and lower sides of the winding portion 11 are provided. The winding portion 11 is formed so that the radius of curvature of the narrowest and narrowest portion is equal to or larger than the allowable minimum bending radius of the optical fiber cable H.
A recess 14 having a cylindrical inner peripheral surface is formed at the center of the lower surface of the lower flange 13. Further, a screw hole 15 (through hole) penetrating from the flange 12 to the recess 14 is formed in the shaft center of the reel 1.

The reel case 2 is a bottomed cylindrical container having an opening on one surface, and includes a peripheral surface portion 21 that faces the outer peripheral surface of the winding portion 11 in a state in which the reel 1 is stored, and a bottom surface portion 22. The opening is formed to have a slightly larger diameter than the flange 12. The gap between the flange 12 and the opening is smaller than the outer diameter of one optical fiber cable H1.
The peripheral surface portion 21 includes notches 23 and 24 at two locations. The notches 23 and 24 are formed on the edge of the peripheral surface portion 21 opposite to the bottom surface portion 22, and serve as a drawing port and a drawing port for the optical cable H. Here, the peripheral surface portion 21 is made of resin or sponge, and the notches 23 and 24 as the inlet and the outlet are formed by an operator cutting off an arbitrary position with a tool such as a cutter. It is.
At the center of the bottom surface portion 22, a protrusion 25 protrudes. The protrusion 25 has a cylindrical shape whose outer shape coincides with the recess 14, has a cavity 26 inside, and is connected to the cavity 26 to form a screw hole 27 at the bottom and a screw hole 28 at the top. . The screw hole 27 and the screw hole 28 have the same female screw diameter as that of the screw hole 15.

The screw 3 is a male screw having a screw groove 31 at the end of the shaft shape, and the screw groove 31 is screwed into the screw hole 27.
The spring 4 is a compression string spring housed in the recess 14 and biases the top of the protrusion 25 in the direction of pushing out from the recess 14. The flange 13 is formed thick so that the lower end of the flange 13 below the reel 1 is not exposed from the upper end of the reel case 2 even when the reel 1 is pushed out of the reel case 2 by the bias of the spring 4. ing.

4 to 6 are longitudinal sectional front views showing a procedure for performing the extra length processing of the optical cable H by the extra length processing tool having the above-described configuration.
First, in a state where the screw groove 31 of the screw 3 and the screw hole 27 of the reel case 2 are disengaged, the reel 1 is pushed outward from the opening of the reel case 2 by the bias of the spring 4, and the winding portion 11 is located at an exposed position (see FIG. 4). In this state, the operator winds the excess length portion Y of the optical cable S around the winding portion 11 of the reel 1 as an optical fiber cable H by removing the protective coating. At this time, even if the operator is not conscious of the allowable minimum bending radius of the optical fiber cable H, in this surplus length processing tool, the curvature radius of the winding portion 11 is equal to or larger than the allowable minimum bending radius of the optical fiber cable H. Therefore, there is no possibility that the optical fiber cable H is bent excessively.

  Next, the operator pushes the reel 1 in the direction in which the reel 1 is housed in the reel case 2 against the bias of the spring 4. Then, when the operator pushes the reel 1 to a position where the tip of the screw 3 is in contact with the screw hole 27 (see FIG. 5), the operator turns the screw 3 so that the screw groove 31 of the screw 3 is screwed into the screw hole 27. Thus, the reel 1 is further pushed into the reel case 2 and fixed (see FIG. 6).

  In assembling the extra length processing tool, the screw groove 31 of the screw 3 is screwed into the screw hole 15 of the reel 1, and the screw 3 is further rotated to penetrate the reel 1. The spring 4 is positioned, the screw groove 31 of the screw 3 is screwed into the screw hole 28 at the top of the protrusion 25 of the reel case 2, and the screw 3 is further rotated in the direction of tightening the screw 3. By being positioned inside, the state shown in FIG. 2 is obtained. In this state, when the screw 3 is rotated in the direction of loosening while pulling the screw 3 upward, the screw groove 31 is re-engaged with the screw hole 28 and further rotated, whereby the screw 3 is removed from the reel case 2. If removed but not subject to such rotation, the thread 31 remains in the cavity 26.

  Thus, according to the present embodiment, the extra length Y of the optical cable S is covered by the peripheral surface portion 21 of the reel case 2 and the flanges 12 and 13 of the reel 1, so that the extra length of the optical cable S can be easily processed. At the same time, the extra length Y can be protected.

  In the implementation, a handle or the like is provided on the upper surface of the reel 1 to facilitate the rotation of the reel 1, and one end of the optical fiber cable H is temporarily attached to the reel 1 when the optical fiber cable H is wound around the winding unit 11. If the reel 1 is rotated and stopped, the optical fiber cable H can be easily wound around the winding portion 11.

  In the present embodiment, the reel 1 is pushed out from the reel case 2 using the spring 4. However, in the implementation, the reel 1 ′ is used as shown in FIG. 7 without using the spring 4. In the range where the axial position of the screw 3 'is fixed with respect to the screw 25', the screw hole 27 'is formed up to the top of the protrusion 25', and the screw groove 31 'of the screw 3' is screwed into the screw hole 27 '. The reel 1 ′ may be moved in and out of the reel case 2 ′ by turning the screw 3 ′ up and down with respect to the protrusion 25 ′.

  Further, in the present embodiment, in this embodiment, the fixing member is configured by the screw hole 27 provided in the protrusion 25 and the screw groove 31 provided in the screw 3 that is screwed into the screw hole 27. Regardless, for example, a claw 3 ″ as a fixing member is rotatably attached to the periphery of the opening of the reel case 2 ″ and the nail 3 ″ is inserted into the reel case 2 ″. A fixing member having another configuration, such as preventing the reel 1 ″ from coming off with 3 ″, may be used.

It is a perspective view which shows the external appearance of the surplus length processing tool in one Embodiment of this invention. It is a vertical front view which shows the structure of the surplus length processing tool in one Embodiment of this invention. It is a top view which shows the state which accommodated the extra length part of the optical cable in the extra length processing tool in one Embodiment of this invention. It is a vertical front view which shows the procedure which performs the extra length process of an optical cable with the extra length processing tool in one Embodiment of this invention. It is a vertical front view which shows the procedure which performs the extra length process of an optical cable with the extra length processing tool in one Embodiment of this invention. It is a vertical front view which shows the procedure which performs the extra length process of an optical cable with the extra length processing tool in one Embodiment of this invention. It is a vertical front view which shows the structure of the surplus length processing tool in the modification of implementation of this invention. It is a vertical front view which shows the structure of the surplus length processing tool in the modification of implementation of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Reel, 2 ... Reel case, 3 ... Screw (fixing member), 4 ... Spring, 11 ... Winding part, 12, 13 ... Flange, 14 ... Recessed part, 15 ... Screw hole (through hole), 21 ... Circumference Surface part, 22 ... Bottom part, 23, 24 ... Notch, 25 ... Projection, 26 ... Hollow, 27 ... Screw hole, 28 ... Screw hole, 31 ... Screw groove, H ... Optical fiber cable, Y ... Extra length part, S ... Optical cable

Claims (3)

A reel including a winding portion having a radius of curvature equal to or greater than the allowable minimum bending radius of the optical fiber cable, and a pair of flanges provided across the winding portion;
Reel case having a bottomed cylindrical container having an opening of a shape matching the flange and storing the reel around which an optical fiber cable is wound, and having a notch communicating with the opening When,
An optical cable surplus length processing tool comprising: a fixing member for fixing the reel in the reel case. The reel communicates with the through-hole at the center of the through-hole formed so as to penetrate both flanges in the shaft center and the flange facing the bottom of the reel case while being accommodated in the reel case. And a recess formed larger in diameter than the through hole,
The reel case further includes a protrusion having an outer shape coinciding with the recess and having a screw hole formed in the shaft center.
The fixing member is a male screw that is inserted into the through-hole from the flange on the opening side in a state where the reel is stored in the reel case, and a tip is screwed into the screw hole. The optical cable surplus length processing tool according to 1. The protrusion has the screw hole in the vicinity of the bottom portion, and has a cavity communicating with the screw hole inside and a hole communicating with the cavity at the top and facing the screw hole,
The optical cable surplus length processing tool according to claim 2, further comprising a spring that is housed in the recess and biases the top of the protrusion in a direction of pushing out the protrusion.

Images