JP4159449B2 - Extra length processing structure of optical fiber in drawer unit - Google Patents

Description

  The present invention relates to an optical fiber extra length processing structure in a drawer unit installed in an optical fiber connection box.

  A large number of units equipped with optical fiber connection portions are accommodated inside the optical fiber connection box. Since there is not enough space above and below in this optical fiber connection box, the optical fiber connection part is mounted on the drawer tray so that the optical fiber connection work can be done easily, and the drawer can be pulled out from the unit body. Units are popular.

  However, when such a drawer unit is used, the excess length of the optical fiber moves in a state in which both ends are constrained in accordance with the movement of the drawer tray when it is pulled out and when it is stored. Need to prevent. Therefore, conventionally, as shown in Patent Document 1, an accordion-shaped cable guide is attached to the drawer unit, the extra length portion of the optical fiber is accommodated therein, and the radius of curvature of the extra length portion of the optical fiber is regulated to control the optical fiber. To prevent excessive stress from acting.

However, since such a bellows-shaped cable guide is expensive to manufacture and assemble, an extra length processing means for an optical fiber that replaces the cable guide is required. Make sure that the width of the optical fiber junction box is sufficiently large and that the extra length of the optical fiber is sufficiently long so that the extra length moves back and forth around the lateral separation position of the drawer tray. For example, a cable guide is unnecessary. However, in this case, the lateral width of the optical fiber connection box must be increased, and there is a problem that the optical fiber connection box increases in size due to the almost wasted space that can be formed inside, which is not practical.
JP 2003-142843 A

  The present invention solves the above-described conventional problems, does not use a cable guide, and does not unnecessarily increase the lateral width of the optical fiber connection box. The present invention has been made in order to provide an extra length processing structure for an optical fiber in a drawer unit in which stress is not generated.

The extra length processing structure of the optical fiber in the drawer unit of the present invention made in order to solve the above-mentioned problem is that the extra length portion of the optical fiber when the drawer tray is closed on the side of the drawer unit provided with the drawer tray. An extra length processing structure for an optical fiber in a drawer unit in which an extra length reel base that can escape in the front-rear direction is installed, and the extra length reel base is a disc-shaped portion that ensures the minimum diameter of a round wound optical fiber. And a plurality of arm portions on which the optical fibers projecting outside are placed, and among these arm portions, an arm portion extending to one of the front side and the rear side is made more than the other arm portions. It is characterized by its length.

  In addition, it is preferable that the extra length reel base is provided with a section for separately storing the extra length portion of the optical fiber.

  According to the extra length processing structure of the optical fiber in the drawer unit of the present invention, the extra length of the optical fiber when the drawer tray is closed by devising the structure of the extra length reel base and the extra length part of the optical fiber. The long part can be released in the front-rear direction by its own elasticity. For this reason, it is possible to prevent excessive stress from occurring in the extra length of the optical fiber without using a conventional cable guide and without unnecessarily increasing the lateral width of the optical fiber connection box. Further, if the extra length reel base is provided with a section for storing the extra length portion of the optical fiber separately as in claim 2, only the final winding portion connected to the drawer tray out of the extra length portion of the optical fiber. When the cables are stored separately, the optical fibers will not rub against each other inside the extra-length reel stand, and will be able to move more smoothly. Therefore, it is easy to identify the optical fiber at the time of subsequent maintenance, and the workability is good.

  FIG. 1 is a perspective view of the inside of an optical fiber connection box showing a first embodiment of the present invention, wherein 1 is a drawer unit stacked in multiple stages inside the optical fiber connection box, and 2 is a front side of each drawer unit 1 This is an extra-length reel base installed in this position. Each extra-reel reel base 2 corresponds to each drawer unit 1 installed at the same height, and in this embodiment, it is installed on both the left and right sides.

  As shown in FIG. 2 and subsequent figures, each drawer unit 1 is composed of a unit body 3 and a drawer tray 4, in which a connection unit 5 is mounted and a cable clamp (not shown) is mounted. Yes. The extra length portion A of the optical fiber drawn out from the extra length reel base 2 is drawn into the inside from the front end portion of the drawer tray 4 as shown in FIG. 2 and thereafter, and is clamped by a cable clamp (not shown). .

  As shown in each figure, the extra-length reel base 2 includes a disk-like portion 6 that secures the minimum diameter of a round wound optical fiber, and a plurality of arm portions 7 on which optical fibers that protrude outwardly are placed. The optical fiber drawn into the optical fiber junction box is first wound in a loop shape for an appropriate number of times in the extra length reel base 2 and then the front end of the drawer tray 4 as shown in FIGS. Connected to the department. Note that the arm portion 7 has an extra length storage portion on the inner side, and the tip 8 of the arm portion 7 rises upward, and is regulated so that the optical fiber does not come out.

  In this embodiment, one of the four arm portions 7 of the extra length reel base 2 that extends to the rear side of the optical fiber connection box extends longer than the other. Therefore, when the drawer tray 4 is closed as shown in FIG. 3 from the drawn state shown in FIG. 2 at the time of wiring, the extra length portion A of the optical fiber is pushed backward by its own elasticity, and the rear side It is possible to escape to the rear side by an amount corresponding to the long extra length storage portion of the arm portion 7 extending to the rear. As described above, in the first embodiment, when the drawer tray 4 is closed, it is possible to prevent the excess length portion A of the optical fiber from escaping in the backward direction and excessive stress from being generated in the excess length portion A of the optical fiber. .

  Since there is a space in front of the extra length reel base 2 inside the optical fiber junction box, one of the four arm portions 7 of the extra length reel base 2 that extends to the front side of the optical fiber junction box is the other. It is also possible to form a larger extra length storage section longer than that and allow the extra length section A of the optical fiber to escape forward when the drawer tray 4 is closed.

  In each of the embodiments, the extra length reel base 2 is preferably provided with a section 9 for separately storing the extra length portion A of the optical fiber as shown in FIG. This section 9 may be provided above the arm portion 7 or outside. If such a section 9 is provided, when only the final winding portion connected to the drawer tray 4 is separately stored in the extra length portion A of the optical fiber, the extra length reel is used when the drawer tray 4 is taken in and out. There is an advantage that the optical fibers do not rub against each other inside the table 4 and can move more smoothly. In addition, when a part of the plurality of core wires is stored separately, the optical fiber can be easily identified at the time of subsequent maintenance, and workability is good. The optical fiber wiring work is performed with the drawer tray 4 pulled out, but the extra reel base 2 is easily attached by engaging the rear elastic locking portion 10 with the locking hole 12 of the substrate 11, Since it can be removed, it is easy to work because it is removed and wired at hand and then attached.

  As described above, according to the extra length processing structure of the optical fiber in the drawer unit of the present invention, the optical fiber extra length is not required when the drawer tray 4 is put in and out without requiring a costly cable guide as in the prior art. It is possible to escape the portion A in the front-rear direction so that excessive stress is not generated in the extra length portion A of the optical fiber. Further, there is an advantage that the width of the optical fiber connection box need not be increased unnecessarily, and the optical fiber connection box is not enlarged.

It is a perspective view inside an optical fiber junction box showing a 1st embodiment of the present invention. It is a top view which shows the state which pulled out the drawer tray in 1st Embodiment. It is a top view which shows the state which closed the drawer tray in 1st Embodiment. It is sectional drawing which shows the arm part of the extra length reel stand in invention of Claim 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drawer unit 2 Extra length reel base 3 Unit main body 4 Drawer tray 5 Connection unit 6 Disc-shaped part 7 Arm part 8 Arm part tip 9 Division 10 which accommodates final winding part Elastic locking part 11 Substrate 12 Locking hole

Claims (2)

Optical fiber extra length processing structure in the drawer unit with an extra length reel stand installed on the side of the drawer unit with the drawer tray that allows the extra length of the optical fiber to escape in the front-rear direction when the drawer tray is closed The extra-reel reel base is provided with a disk-shaped portion for ensuring the minimum diameter of a round wound optical fiber and a plurality of arm portions for placing the optical fiber projecting outside. An extra length processing structure for an optical fiber in a drawer unit, wherein an arm portion extending to either the front side or the rear side of the arm portion is longer than the other arm portions.   The extra length processing structure of an optical fiber in a drawer unit according to claim 1, wherein the extra length reel base is provided with a section for separately storing the extra length portion of the optical fiber.

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