JPS6218886B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an optical subscriber cable drop box used in a portion where an optical subscriber cable is dropped to a subscriber.

(Prior art) Although the technology for sending metal cables with metal wire cores to subscribers has been established, it is difficult to apply this metal cable drop-off box technology to optical cable drop-off boxes. This is not possible due to problems specific to optical cables (particularly problems with optical fiber connection technology). However, just like with metal cables, optical cables also need to be debited when subscriber demand occurs, and there is an urgent need to establish this technology. In particular, in the case of optical cables, it is necessary to leave extra length in the optical fiber core at the drop-off point in case of connection changes or reconnections, but this extra length can cause connection failures. Therefore, it is necessary to safely store such an irregular extra length and to easily take it out when necessary.

As an optical subscriber cable drop-off box that meets these requirements, a mounting member is provided at the top of the box body, and a plurality of extra length storage cases are attached to this mounting member at the opening side for storing extra length at the top. A structure in which it is supported and suspended has been proposed.

However, in a draw-down box with such a structure, when putting in or taking out the extra length of the optical fiber core, there is a pivot and a mounting member for the pivot on the side of the opening for storing the extra length, so these need to be removed. There was a problem that it was very difficult to put in and take out the extra length because it got in the way. Furthermore, with this structure, there is a problem in that when the extra length storage case at the back side is used to put in and take out the extra length, the extra length storage case at the front side becomes a hindrance to the work. Furthermore, the extra length storage case on the front side will fall back to its original position unless it is lifted and supported by hand, so there is also the problem of poor workability in this respect.

(Object of the Invention) An object of the present invention is to provide an optical subscriber cable drop-off box that allows the extra length of optical fiber core wire to be easily inserted and removed, and that has good workability for inserting and removing the extra length. be.

(Structure of the Invention) The optical subscriber cable drop-off box according to the present invention is provided with an extra length storage case inside a box main body whose front side is open, and the extra length storage case can be raised and lowered with respect to the box main body. A plurality of extra length storage chambers are provided in a multi-layered structure, and each opening of each extra length storage chamber is located on the side opposite to the pivot portion and is pivoted at one end side in the length direction so that The storage case is provided in a stepwise manner, and the extra length storage case and the box body are provided with locking devices for temporarily fixing the extra length storage case in an upright state, and the opening of the box body is provided with a cover. It is characterized by the fact that it has become occluded.

(Example) Examples of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 to 5, the optical subscriber cable drop box 1 of this embodiment includes a box body 3 having an opening 2 on the front, and a bottom plate 3A of the box body 3 has a telephone pole, etc. Attach this box body 3 with a metal band etc.
A mounting bracket 4 is provided for supporting the. An extra length storage case 5 is housed inside the box body 3. This extra length storage case 5 has a bottom surface 5A.
One lengthwise end side thereof is rotatably supported by a pivot 6 so that it can freely rise and fall in the direction of approaching or moving away from the bottom surface 3A of the box body 3. The pivot portion 6 consists of a long hole 6A drilled in the side wall of the box body 3, and a screw 6B passed through the long hole 6A and screwed onto the extra length storage case 5.
The side wall 5B of the extra length storage case 5 on the side of the pivot portion 6 is obliquely inclined so that it cannot be seen from the front. The side surface of the extra length storage case 5 on the opposite side to the side wall 5B is inclined so as to be seen from the front, and a plurality of extra length storage chambers 7 are formed in the extra length storage case 5 by opening the side surface in a stepwise manner. It is provided in a multilayer structure in a direction parallel to the bottom surface 5A. A connection part holder 8 is provided in the notch 7A at the entrance of each extra length storage chamber 7.
is removably provided. Extra length storage case 5
A handle 9 is attached to the front surface of the case 5 to be used when raising and lowering the case 5. Extra length storage case 5
U-shaped mounting flanges 10 are protruded from the left and right sides of the case 5 as locking devices for stopping the case 5 at a required position. In the stored state, the U-shaped cut groove 10A of the mounting flange 10 is inserted into the screw 12 screwed into the mounting seat 11 on the bottom surface 5A.
It is fixed by fitting and tightening the screw 12. Further, on the inner surfaces of the left and right side walls 3B of the box main body 3, U-shaped plate-shaped stoppers 13 as a stopper are protruded in a direction intersecting the mounting flange 10, and the extra length storage case 5 In the upright state shown by the broken line in Fig. 2, the mounting flange 1 is inserted into the U-shaped groove 13A of the stopper 13.
By fitting the U-shaped grooves 10A of 0, the extra length storage case 5 can be temporarily supported. Along the side wall 3B of the box body 3 facing the pivot portion 6 side, a cable side core wire retaining portion 14 is provided inside the box body 3.
Optical outdoor line holding sections 15 for withdrawal are provided on the left and right sides. The cable-side core wire retaining portion 14 has a core wire insertion groove 17 intermittently on the surface of the columnar holder 16.
A press plate 18 is placed on the surface of the holder 16 to press the core wires in these grooves 17, and is fixed with screws 19. The outdoor optical line holding section 15 has a columnar holder 20 provided with a hole 21 for passing the optical fiber core wire of the outdoor optical line and a hole 22 for passing the tension member.
The tension member inserted through the hole 22 is fixed with a retaining screw 23 screwed into the holder 20 in a direction perpendicular to the hole 22. Bushing plates 24 and 25 are fitted into cutout portions of the side wall 3B of the box body 3 corresponding to the cable side core wire retention portion 14 and the optical outdoor wire retention portion 15. Each bushing plate 24, 25 has a groove 17 and a hole 2.
A thin through-hole planned portion 2 corresponding to 1 and 22
6 and 27 are formed. Opening 2 of box body 3
is closed with a cover 28 as shown in FIG. In order to fix the cover 28 in a closed state, a fixing screw 29 is screwed into the box body 3 adjacent to the pivot portion 6. The cover 28 is attached to the box body 3 with a chain 30 to prevent it from falling when removed.
is connected to.

Next, the use side of such optical subscriber cable drop box 1 will be explained with reference to FIG. 6 and FIGS. 1 to 5. The box body 3 is fixed to an electrode 32 through a stainless steel band 31 through a mounting bracket 4. A self-supporting optical cable 33 for wiring as an optical subscriber cable is installed on the utility pole 32 . The self-supporting optical cable 33 for wiring is composed of a plurality of cord-shaped optical fiber core wires 35 twisted together around the outer periphery of a tension member 34, and the tension member 34 is connected to a tension member support fitting 36.
It is supported by telephone pole 32. The installed self-supporting optical fiber cable 33 for wiring is connected to a utility pole 32 where any optical fiber core 35 therein is attached to the utility pole 32.
The cut optical fiber core 35 is separated from the optical cable 33 as an extra length from the cutting position to the telephone pole 32, and the tip side is separated from the bushing plate 2.
The thin-walled through-hole forming portions 26 and 27 of 4 are torn and drawn into the box body 3, and the cable-side core wire retaining portion 1
It is held back at 4. Further, the optical outdoor line 37 to be wired to the subscriber's home is also drawn into the box body 3 by tearing through the thin through-hole forming portion 27 of the bushing plate 25, and is held at the optical outdoor line holding part 15. . The retraction length into each box body 3 is approximately 70cm.
Expect the degree. Before starting the extra length processing work, loosen the screws 12 that fasten the extra length storage case 5, and remove the handle 9.
Remove the mounting flange 10 from the screws 12 by lifting the extra length storage case 5 upwards, then rotate the extra length storage case 5 around the pivot 6 and raise it toward you, and then remove the U-shape of the mounting flange 10. By inserting and locking the U-shaped groove 10A into the U-shaped groove 13A of the stopper 13, the extra length storage case 5 is held in an upright state.

To deal with the extra length, use the optical fiber core 3 on the cable side.
5 and the outdoor optical wire 37 are each rolled into a ring shape and temporarily fixed with tape or the like, and in this state, a connector is connected to the optical fiber core 35 and the outdoor optical wire 37 to connect them to each other, and the fiber connecting portion 38 form. This fiber connection part 38 is attached to the connection part holder 8, and the excess length of the optical fiber core 35 and the optical outdoor wire 37 is temporarily fixed while inserting it into the excess length storage chamber 7 of the excess length storage case 5. Finally, the connecting portion holder 8 is inserted into the notch 7A at the entrance of the extra length storage chamber 7 to support it, and the extra length processing is completed.

After the extra length has been processed, lift the extra length storage case 5 and attach the mounting flange 10 to the stopper 13.
The box body 3 is rotated around the pivot part 6, and the mounting flange 10 is hooked onto the screw 12, and the screw 12 is tightened to fix it. After that,
Cover 28 is inserted from the front into opening 2 on the front of box body 3.
and fix this cover 28 with fixing screws 29.

(Effects of the Invention) As explained above, in the optical subscriber cable drop box according to the present invention, the stepped opening of the extra length storage case is provided on the opposite side of the extra length storage case from the pivot portion. Therefore, there is nothing obstructing the opening side, and the extra length of the optical fiber can be easily taken in and taken out. In addition, in the present invention, since the common extra length storage case has a structure in which extra length storage cases are provided in a multilayer structure, when the extra length storage case is raised, the openings of all the extra length storage chambers protrude. This means that extra length can be easily taken in and out even from the opening at the back. Furthermore, in the present invention, since the extra length storage case is temporarily fixed in the raised state with the locking tool, the extra length storage case can be maintained in the upright position even if it is not supported by hand, which improves work efficiency. It has the advantage of improving.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the optical subscriber cable drop-off box according to the present invention with the cover removed, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 1 is a left side view of FIG. 1, FIG. 4 is a side view of the core wire introduction side of FIG. 1, FIG. 5 is a sectional view taken along line B-B of FIG. FIG. 3 is a perspective view of the device in use. 1... Withdrawal box, 2... Opening, 3... Box body, 5...
Extra length storage case, 6... Pivotal section, 7... Extra length storage room,
8...Connection part holder, 10...Mounting flange as a locking tool, 13...Stopper as a locking tool, 14
...Cable side core wire holding part, 15...Optical outdoor wire holding part, 28...Cover, 33...Optical subscriber cable, 3
7... Optical outdoor line.

Claims (1)

[Claims] 1. An extra length storage case is provided in a box main body whose front side is open, and one end of the extra length storage case is pivoted so as to be able to rise and fall freely with respect to the box main body, and the extra length storage case is The long storage case is provided with a plurality of extra length storage chambers in a multi-layered structure, each opening of each of the extra length storage chambers is provided in the extra length storage case in a stepwise manner on the opposite side from the pivot portion, The extra length storage case and the box body are provided with a locking tool for temporarily fixing the extra length storage case in an upright position, and the opening of the box body is closed with a cover. Features an optical subscriber cable drop box.