JP2005215093A - Splice box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a splice box which permits to easily add equipment, and does not make the storage complex without increasing the number of trays even when there are two or more kinds of excess lengths of optical fibers. <P>SOLUTION: A main body case 2 is formed from a synthetic resin with the front face open, and an additional case 18 formed from the synthetic resin with the front face open is mounted on the front face of this main body case 2 by a mounting screw 25 and a locking pawl 21 so as to be freely attachable and detachable. An optical cable, an optical fiber cord, or the like is externally introduced into the main body case 2; a welding part and a excess length of the optical fiber, a connector connecting part; and the like are held inside; and equipment such as a media converter can be housed in the additional case. Moreover, floating prevention pieces of a complementary length of a complementary length holding part in the main body case are formed in two steps with different heights so that a coated optical fiber can be held in the lower stage and an optical fiber cord can be held in the upper stage. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a resin splice box that accommodates a fused portion and an extra length of an optical fiber.

The splice box consists of a resin main case with at least the front open and a removable resin cover that closes the open part of the main case. Or an optical fiber cord is introduced inside, the optical fiber is fused and the fused portion is fixed to the holder, and the extra length of the optical fiber formed at the time of fusion is accommodated in the extra length accommodating portion of the tray. The tray is provided so as to be stacked in a plurality of stages, and a plurality of extra-height lifting prevention pieces are provided on the peripheral wall forming the tray so as to protrude inward at the same height with appropriate spacing.
JP 2004-12691 A

  The splice box needs to be installed according to the purpose, or it is necessary to add equipment to the existing one. However, the conventional splice box has a limited internal space and cannot accommodate additional equipment. there were. In addition, since the extra length storage portion is provided with only one extra length prevention piece, it becomes complicated when accommodating plural types of optical fibers such as optical fiber cords and optical fiber cores. In order to solve this problem, it is necessary to provide a plurality of trays for each type of optical fiber, which increases the number of parts.

  According to the first aspect of the present invention, there is provided a resin main body case having an open front surface and a removable resin cover for closing the front opening of the main body case. In the splice box that introduces the optical fiber cord and accommodates the fusion part and the extra length inside, an extension case can be attached to and detached from the front opening of the main body case.

  According to a second aspect of the present invention, in the splice box according to the first aspect, the surplus length of the anti-lifting piece projecting inwardly around the surplus length storage portion for storing the surplus length of the optical fiber is provided. It is provided in a plurality of stages.

  The splice box of the present invention can easily increase the number of devices, and even when there are a plurality of types of extra optical fibers, the number of trays is not increased, and the storage is not complicated.

  The main body case is formed by opening a front surface with a synthetic resin, and an extension case formed by opening the front surface with a synthetic resin on the front surface of the main body case is made detachable by a mounting screw and a locking claw. The front opening of the extension case is detachably closed by a cover and an auxiliary cover. The main body case introduces an optical fiber cable, an optical fiber cord, and the like from the outside, and stores an optical fiber fusion portion, extra length, connector connection portion, and the like, and an expansion case can store devices such as a media converter. Also, the extra length prevention piece of the extra length storage part of the main body case is formed by changing the height to two stages, the optical fiber cord is stored in the lower stage, and the optical fiber cord can be stored in the upper stage To do.

  An embodiment of a splice box according to the present invention will be described with reference to the accompanying drawings of FIGS.

  The splice box 1 includes a resin main body case 2 having an open front surface, and a removable resin cover 3 that closes the front opening of the main body case 2.

  The body case 2 is fixed by screwing the four corners of the back plate portion 2a to the wall of the building, and the optical fiber cable 5 and the optical fiber cord 6 are introduced from the outside through the introduction holes 4 of the lower plate portion 2b. A packing 7 is provided in the introduction hole 4 to protect the optical fiber cable 5 and the optical fiber cord 6.

  The optical fiber cable 5 introduced inside is fixed by a fixing member 8 provided at the lower part of the main body case 2 so as not to drop off, and the optical fiber core wire 9 extending from the ends of the optical fiber cable 5 and the optical fiber cord 6. We are fusing together.

  The fused portion 10 of the optical fiber core wire 9 is held by a U-shaped holder portion 11 that protrudes forward at both the center left and right portions of the main body case 2. Further, the surplus length that can be formed at the time of fusion is rounded and accommodated in a surplus length accommodating portion 13 constituted by the inner surfaces of the left and right side plate portions 2c and 2d of the main body case 2 and the projecting pieces 12 that project from both the central upper and lower portions. The The left and right side plate portions 2c, 2d of the main body case 2 and the projecting piece 12 are provided with a plurality of extra length anti-lifting pieces 14a, 14b at appropriate intervals and projecting inwardly, and in this example, formed in two stages. Has been.

  For this reason, the extra length of the optical fiber core 9 is accommodated between the back plate portion 2a of the main body case 2 and the lower lift prevention piece 14a, and the extra length of the optical fiber cord 6 is lower than the lower lift prevention piece 14a. The extra length storage of the optical fiber core wire 9 and the optical fiber cord 6 can be performed separately, for example, by storing it between the floating prevention pieces 14b.

  Moreover, the adapter 15 can be attached to the center left and right both sides of the back plate portion 2a of the main body case 2, and the optical fiber cords 6 can be connected to each other by a connector.

  Engagement protrusions 16 project from the outer surfaces of the upper plate portion 2e and the left and right side plate portions 2c, 2d of the main body case 2, and engagement pieces are provided on the upper surface plate portion 3e of the cover 3 and the inner surfaces of the left and right side plate portions 3c, 3d. 17 protrudes. Accordingly, the cover 3 can be fitted and attached from above the main body case 2 so that the engagement piece 17 engages with the back side of the engagement protrusion 16.

  An extension case 18 can be attached to and detached from the front opening of the main body case 2. The expansion case 18 is formed by opening a front surface with a synthetic resin, and a device such as a media converter can be accommodated therein although not illustrated. Recessed portions 20 having mounting holes 19 are formed on the upper left and right sides of the back plate portion 18a of the extension case 18, and locking claws 21 are provided on the left and right lower portions of the back plate portion 18a so as to protrude in the back direction. The back plate 2a is provided with a boss 23 having a screw hole 22 formed at a position facing the recess 20 of the extension case 18, and a locking hole 24 formed at a position facing the locking claw 21. Yes. Further, the tip of the mounting hole 19 of the recess 20 is formed in a step shape and is fitted to the outer periphery of the boss 23.

  In order to attach the expansion case 18 to the main body case 2, the expansion case 18 is pressed from the front of the main body case 2 with the cover 3 removed from the main body case 2, and the engagement between the locking hole 23 of the main body case 2 and the expansion case 18. The pawl 21 is locked, and the boss 23 of the main body case 2 and the tip of the hollow portion 20 of the extension case 18 are fitted to each other for positioning, and the mounting screw 25 is inserted into the mounting hole 19 of the hollow portion 20 from the front surface. It is carried out by inserting and screwing into the screw hole 22 of the boss 23. Wiring between the device accommodated in the extension case 18 and the main body case 2 can be performed through the wiring hole 26 of the back plate portion 18a.

  The cover 3 of the extension case 18 can also be used as the cover 3 of the main body case 2, and the attachment method is the same, and the engagement piece 17 of the cover 3 is engaged and attached to the engagement protrusion 27 of the extension case 18. However, since the lower part of the extension case 18 is opened from the shape of the cover 3, the auxiliary cover 28 is attached to this part. The auxiliary cover 28 has projections 29 formed on the left and right inner sides, and is attachable and detachable by engaging with the engaging recess 30 of the extension case 18. By forming the cover 3 and the auxiliary cover 28 of the extension case 18 to be transparent or semi-transparent, it is possible to check the operating status of the device such as the media converter without removing the cover.

  In this embodiment, the extension case 18 is closed by the cover 3 and the auxiliary cover 28, but may be closed by a single cover. Further, there is no limitation on the mounting structure of the main body case 2 and the extension case 18, and the rising prevention piece of the extra length storage portion is not limited to being formed integrally with the main body case 2 but is formed on the tray as in the conventional example. Even if applicable.

It is a front view which shows the main body case of the splice box which concerns on this invention. It is the sectional view on the AA line of FIG. It is a front view which shows the cover of the splice box which concerns on this invention. It is the BB sectional view taken on the line of FIG. It is a right view which shows a mode that a cover is attached to the main body case of the splice box which concerns on this invention. It is a front view which shows the expansion case of the splice box which concerns on this invention. It is a right view which shows a mode that an extension case is attached to the main body case of the splice box which concerns on this invention, and a cover and an auxiliary | assistant cover are attached to this extension case. It is a front view which shows the splice box which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Splice box 2 Main body case 3 Cover 5 Optical fiber cable 6 Optical fiber cord 9 Optical fiber core wire 14a, 14b Lifting prevention piece 18 Additional case

Claims (2)

  It consists of a resin main body case with a front opening and a removable resin cover that closes the front opening of the main body case. An optical fiber cable and an optical fiber cord are introduced from the outside, and a fusion part is formed inside. A splice box for storing an extra length, wherein an extension case is detachable from a front opening of the main body case.   A splice box comprising a plurality of extra-height anti-lifting pieces projecting inwardly around an extra-length accommodating portion for accommodating an extra length of an optical fiber.

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