JP2011048091A - Extra length storage tray - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extra length storage tray capable of preventing an optical connection part from dropping through a clearance between holding ribs when raising the extra length storage tray while its upper face is opened. <P>SOLUTION: The extra length storage tray being a resin molding is constituted by: including on a tray bottom plate 2 an optical connection part holding part 8 for fitting the optical connection part of optical fibers into the clearance between the holding ribs 31 provided at an interval therebetween and holding it; and connecting the extra length storage trays being vertically stacked through a hinge part provided on one side of the tray bottom plate 2 openably and closably, wherein the extra length storage tray is provided with projections 32a, 32b protruding inward in upper faces of opposing faces of adjacent holding ribs 31. Although the optical connection part being loosely fitted into the clearance between the holding ribs 31 is likely to drop through the clearance when raising the extra length storage tray while being opened, the projections 32a, 32b in the upper parts prevent dropping of the optical connection part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  According to the present invention, an optical connecting portion holding portion provided with a plurality of holding ribs at intervals is provided on a tray bottom plate, and the extra length storage trays stacked vertically are hinged by a hinge portion provided on one side of the tray bottom plate. The present invention relates to an extra length storage tray for a resin molded product that is hinged to be openable and closable.

In an optical closure installed in a straight connection portion, a branch connection portion, a drop cable introduction portion, or the like of an optical fiber cable in an optical line, an optical fiber core wire is usually provided as shown in FIG. A surplus length storage tray 41 of a resin molded product that stores 20 surplus lengths is disposed.
Inside this extra length storage tray 41, optical connection portions 43 between optical fibers are fitted and held in gaps between holding ribs 44 provided at intervals as shown in the enlarged sectional view of FIG. An optical connection holding unit 45 is provided on the tray bottom plate 46. The optical connection portion 43 is a fusion spliced portion in which optical fibers are fusion spliced and reinforced with a reinforcing member, or a mechanical splice in which optical fibers are butt-connected. 47 is an optical fiber core wire entry / exit portion, and 48 is a core wire pressing tongue.
The extra length storage tray 41 is generally used by stacking a plurality of pieces as shown in FIG. 17. However, the upper and lower lengths of the optical fiber core wires in the extra length storage trays 41 can be individually processed. The extra length storage trays 41 adjacent to each other are rotatably connected by a hinge portion 50 provided on the side wall 49 on one side, so that any stacked extra length storage trays can be opened and closed (Patent Document 1). .

  If the gap between the holding ribs 44 of the optical connecting portion holding portion 45 is too tight with respect to the outer diameter of the optical connecting portion 43, the optical connecting portion 43 is held even if the optical connecting portion 43 can be stably held. Since workability when attaching to and detaching from the gap between the ribs 44 is deteriorated, the gap between the holding ribs 44 usually has a slight margin with respect to the outer diameter of the optical connecting portion 43 as shown in FIG. It is

JP 2001-42158 A

As described above, the optical connection portion holding portion 45 in the conventional extra-length storage tray 41 is configured such that the gap between the holding ribs 44 does not fit the optical connection portion 43 tightly, but loosely fits. When a part of the extra length storage trays 41 of the stacked extra length storage trays 41 is opened for processing the inner optical fiber core wire, the upper extra length storage tray 41 is arranged as shown in FIG. When this happens, the optical connection portion 43 in the extra length storage tray 41 may fall out of the gap between the holding ribs 44. If the optical connecting portion 43 falls off between the holding ribs 44, the work of returning it to the original is complicated, and the work efficiency is deteriorated.
The core pressing tongue 48 prevents the optical fiber core 20 introduced into the tray from jumping out of the tray, but generally further, as shown in FIGS. A transparent thin film 51 is covered so as to cover the entire inside of the tray.
However, since the film 51 for holding the core wire is thin and has almost no rigidity, the film 51 for preventing the optical connection portion 43 from falling off cannot be achieved.

In the invention of Patent Document 1, the structure of the optical connection portion holding portion 45 is not particularly changed, and the optical connection portion 43 is covered with a tube made of an elastic material, and this tube-coated optical connection portion is fitted between the holding ribs 44. The covering tube is elastically fitted between the holding ribs 44 so that the optical connecting portion 43 does not move unnecessarily.
However, the measure for covering the optical connecting portion 43 with the elastic tube increases the number of components, and an additional work for covering the elastic tube is added, so that a measure that does not require a separate component is desirable.

  The present invention has been made to eliminate the above-described conventional drawbacks, such as when the extra length storage tray is raised to open a part of the extra length storage tray of the stacked extra length storage tray. Another object of the present invention is to provide an extra-length storage tray in which the optical connecting portion is not likely to drop out from the gap between the holding ribs of the optical connecting portion holding portion.

According to a first aspect of the present invention for solving the above-mentioned problem, an optical connection part holding part for holding an optical connection part between optical fibers in a gap between holding ribs provided at intervals is provided on a tray bottom plate. In the surplus length storage tray of the resin molded product in which the surplus length storage trays stacked one above the other are hinged to be opened and closed by a hinge portion provided on one side of the tray bottom plate,
A protrusion projecting inward is provided on the upper portion of the opposing surface of the adjacent holding rib.

  According to a second aspect of the present invention, in the extra-length storage tray according to the first aspect, a bottom plate through hole having a shape and dimension so as to include a portion with the protrusion as viewed from above is provided in the tray bottom plate between the holding ribs. To do.

  According to a third aspect of the present invention, in the surplus length storage tray according to the first or second aspect, the cross-sectional shape of the protrusion is a substantially equilateral triangle or an isosceles triangle.

  According to a fourth aspect of the present invention, in the extra length storage tray according to any one of the first to third aspects, the protrusions are provided at two locations on both sides in the longitudinal direction of the holding rib.

  5. The surplus length storage tray according to any one of claims 1 to 4, wherein the holding rib has a thick portion on both sides in the length direction and a thin portion at an intermediate portion. A structure that holds a short and large-diameter optical connection part with a wide gap formed between the parts, and holds both sides of a long and small-diameter optical connection part with a narrow gap formed between the thick parts on both sides. And the protrusion is provided on each of the thick part and the thin part.

  Claim 6 is the extra length storage tray according to claim 5, wherein the protrusions provided in the thick part and the thin part and the bottom plate through holes provided corresponding to the protrusions are thick on both sides in the holding rib longitudinal direction. Provided in the vicinity of the boundary between the thin portion and the thin portion.

  According to the present invention, since the protrusion projecting inward is provided on the upper portion of the facing surface of the adjacent holding rib, the upper portion of the stacked extra length storage tray is opened to open the extra length storage tray. When the extra length storage tray is raised, the projection prevents the optical connection portion from falling out of the gap between the holding ribs.

According to the second aspect, since the bottom plate through hole is provided in the tray bottom plate between the holding ribs so as to correspond to the projection, it is easy to integrally form the projection when the extra length storage tray is molded with resin. .
That is, in the case where the holding rib is simply formed on the tray bottom plate as in the prior art, the core pin necessary for the mold is provided in order to form the protrusion on the opposing surface of the adjacent holding rib due to the surrounding shape. It becomes difficult.
However, if the bottom plate through hole is open, it is possible to provide the core pin necessary for the mold to form the protrusion using the bottom plate through hole.
In addition, when the optical connection part held between the holding ribs is taken out from the bottom plate through hole, the optical connection part can be easily taken out by pushing up the lower surface of the optical connection part from below the bottom plate through hole with a stick or the like. There is also an effect.

  If the cross-sectional shape of the protrusion is a substantially equilateral triangle or an isosceles triangle as in claim 3, the optical connection part is pushed into the gap between the holding ribs and taken out from the gap between the holding ribs. The operation without difficulty is possible.

  As in claim 4, it is appropriate to provide protrusions at two locations on both sides of the holding rib in the longitudinal direction in order to smoothly attach and detach the optical connecting portion.

  According to the fifth aspect, when the holding rib of the optical connecting portion holding portion is a structure which is used for both the short and large diameter optical connecting portion and the long and small diameter optical connecting portion, the optical connecting portion is prevented from falling off. Can be fulfilled effectively.

  As in claim 6, when the holding rib of the optical connecting portion holding portion is a structure that is used for both the short and large diameter optical connecting portion and the long and small diameter optical connecting portion, the protrusion and the bottom plate through hole are formed as a thick portion. Providing in the vicinity of the boundary with the thin-walled portion is appropriate as a structure for preventing the two types of optical connection portions from falling off, and is also appropriate for preventing the bottom plate through hole from being unnecessarily widened.

It is a top view of the surplus length storage tray of one Example of this invention. It is a front view of the said extra length storage tray. It is AA sectional drawing of FIG. It is a right view of FIG. It is BB sectional drawing of FIG. It is the enlarged view which showed the optical connection part holding | maintenance part part in FIG. It is CC sectional drawing of FIG. It is the perspective view which showed the optical connection part holding | maintenance part part in FIG. FIG. 7 is a view showing a state in which optical connection portions are arranged in the gaps between the holding ribs (in the illustrated example, a single-core optical connection portion and a multi-fiber optical connection portion are respectively arranged). It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. FIG. 2 is a diagram showing an example of an optical fiber core wire storage mode in the extra length storage tray of FIG. 1, in which (a) is a case where the optical connection portion is held by the upper optical connection portion holding portion in FIG. Is the case where the optical connection part is held by the lower optical connection part holding part in FIG. It is the figure which added and showed the introduction state of the optical fiber core wire in the surplus length storage tray of FIG. It is a right view of the state which laminated | stacked the extra length storage tray of FIG. 1 on 4 steps | paragraphs, and attached the lid | cover. In FIG. 13, it is the figure which raised a part of extra length storage tray in the upper surface open state. It is a top view which shows the conventional extra length storage tray. FIG. 16 is an enlarged view of a part of the FF cross section of FIG. 15 omitted. It is the figure of the state which laminated | stacked the said conventional extra length storage tray and raised the uppermost extra length storage tray.

  Hereinafter, the extra length storage tray which implemented this invention is demonstrated with reference to drawings.

1 is a plan view of an extra length storage tray 1 according to an embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, FIG. 4 is a right side view of FIG. It is BB sectional drawing of FIG.
This extra-length storage tray 1 is a resin-integrated molded product, and includes side walls 3 and 4 on the periphery of a generally oval tray bottom plate 2, and optical fiber cores on both sides in the tray longitudinal direction (left-right direction in FIG. 1). Comprising wire entry / exit portions 5 and 6, an extra length storage portion 7 for accommodating the extra length of the optical fiber core, and an optical connection portion holding portion 8 for holding the optical connection portion 30 (see FIG. 9), Hinge structures 10 are provided at two locations in the tray longitudinal direction of the linear side wall 4 on one side (optical fiber core wire entry / exit portions 5 and 6 side) orthogonal to the tray longitudinal direction of the tray bottom plate 2. With this hinge structure 10, the extra length storage trays 1 stacked vertically can be hinged.
The optical connection portion 30 is a fusion spliced portion in which optical fibers are spliced together and reinforced with a reinforcing member, or a mechanical splice in which optical fibers are butt-connected. The reinforcing member of the fusion splicing part has a structure in which a portion where the optical fiber is fusion spliced is covered with an inner sleeve, and a reinforcing sleeve is covered with a tensile strength material.
Reference numeral 9 denotes an engaging claw that engages with an engaging recess (not shown) of the upper surplus storage trays 1 stacked to lock the surplus storage trays 1 together. Reference numeral 31 denotes a holding rib of the optical connection part holding unit 8 described later in detail. The core wire pressing tongues 11a, 11b, 11d extend inward from a plurality of locations on the upper edge of the side wall 3, and the core wire pressing tongue 11c extends inward also from the side wall 4 on the hinge structure 10 side. Yes. A cord pressing tongue piece 11e also extends from the holding rib 31 on the center side of the optical connection holding portion 8 toward the center. The lower portions of the cord pressing tongues 11a, 11b, 11c, 11d, and 11e in the bottom plate 2 are holes 2a, respectively.
Protrusions 12 are provided on the cord pressing tongues 11 a on both the left and right sides of the straight portion of the side wall 3. This protrusion 12 enters the hole 2a ′ (see FIG. 1) of the bottom plate 2 of the upper extra-length storage tray 1 and engages with the edge thereof, thereby preventing displacement (movement) in the tray longitudinal direction.
Although the material of the extra length storage tray is not particularly limited, for example, ABS resin, PS (polystyrene) resin, or the like can be used.
The extra length storage tray 1 is disposed, for example, inside an optical closure or the like installed in a straight connection portion, a branch connection portion, a drop cable introduction portion, or the like of an optical fiber cable in an optical line.

The extra length storage tray 1 is stacked as shown in FIG. 13, for example.
As shown in FIG. 14, any of the stacked extra length storage trays 1 can be rotated around the pin 16 of the hinge structure 10, and the extra length storage tray 1 on the lower side is opened, and each extra length is stored. It is possible to individually process the optical fiber core wires in the storage tray 1.
13 and 14, reference numeral 13 denotes a lid.
As shown in FIGS. 1 and 2, the hinge structure 10 includes a pair of a projecting piece portion 15 having a pin 16 and a pin receiving portion 17 having a pin hole 18. When stacked one above the other, one pin 16 fits into the other pin hole 18 and functions as a hinge. Reference numeral 19 denotes a protrusion for preventing the removal.

6-8 is a figure explaining the detail of the optical connection part holding | maintenance part 8 in the said extra length storage tray 1. FIG.
6 is an enlarged view showing a part of the optical connection part holding part 8 in FIG. 1, FIG. 7 is a sectional view taken along the line CC of FIG. 6, and FIG. 8 is a perspective view showing a part of the optical connection part holding part 8 in FIG. FIG.
The optical connection part holding part 8 has a configuration in which a plurality of holding ribs 31 are formed on the tray bottom plate 2 at an interval by being integrally formed therewith.
Comparing a fusion spliced portion reinforced with a reinforcing member of a single-core optical fiber core and a spliced spliced portion reinforced with a reinforcing member of a multi-core optical fiber core (optical fiber ribbon), in general, The fusion splicing portion of the core wire is long and has a small diameter, and the splicing connection portion of the multi-core wire is short and has a large diameter. The optical connection part holding part 8 in the illustrated example mainly holds the two types of optical connection parts.
That is, the holding rib 31 is a single extra-length storage tray, and is used for the optical connection portion (fusion splicing portion) of the single-core optical fiber and the optical connection portion (fusion splicing portion) of the multi-core optical fiber. Both can be accommodated, and have a structure having thick portions 31a on both sides in the length direction, thin portions 31b in the middle, and enormous portions 31c on both ends. The boundary between the thick part 31a and the thin part 31b is a step when viewed from above.
As a result, the multi-fiber optical connection portion can be held only by the wide space formed between the thin portions 31b, and the single core wire is formed by the narrow space formed between the thick portions 31a on both sides. Can be held, and the single-core optical connection portions are prevented from coming off in the length direction at the enormous portions 31c at both ends. Further, in the illustrated example, as shown in FIG. 7, the central portion of the intermediate thin portion 31b is cut out in a U shape. Since the middle portion of the optical connecting portion can be gripped by the U-shaped notch 31b ′, the optical connecting portion can be easily attached and detached.
And the protrusion 32 which protrudes inward is provided in the upper part of the opposing surface of the adjacent holding rib 31, respectively.
The cross-sectional shape of the illustrated protrusion 32 is a substantially equilateral triangle, but may be an isosceles triangle. If it is an equilateral triangle or an isosceles triangle close to this, it is possible to operate without difficulty both when pushing the optical connecting part into the gap between the holding ribs and when removing it from the gap between the holding ribs. is there. Naturally, the apex of the triangle should have a slight radius. However, the cross-sectional shape is not necessarily limited to a triangle, and may be any cross-sectional shape that can prevent the optical connection portion from coming off and can be smoothly attached and detached.
The protrusions 32 are provided on the thick portions 31a on both sides, and are provided on both sides of the intermediate thin portion 31b. The protrusion 32 of the thick part 31a is indicated by 32a, and the protrusion 32 of the thin part 31b is indicated by 32b. The protrusion 32a of the thick part 31a and the protrusion 32b of the thin part 31b are provided in the vicinity of the boundary between the thick part 31a and the thin part 31b on both sides in the longitudinal direction of the holding rib, that is, in the vicinity of the stepped part when viewed from the top.
An example of the size of each part in the embodiment will be described. The gap between the holding ribs 31 has a tapered shape in which both the thick part 31a and the thin part 31b are wide at the upper end and narrow at the lower end, and the gap between the holding ribs 31 is The upper end of the thick part 31a is about 3.5 mm, and the upper end of the thin part 31b is about 4.5 mm. The protrusion height of the protrusion 32 is about 0.5 mm.

The tray bottom plate 2 between the holding ribs 31 is provided with a bottom plate through hole 33 having a shape and dimension that includes a portion with the protrusion 32 when viewed from above. In the example of illustration, the baseplate through-hole 33 is provided in the vicinity of the boundary of the thick part 31a and the thin part 31b in the holding rib longitudinal direction both sides. Each bottom plate through-hole 33 has a shape including protrusions 32a and 32b in the vicinity of the boundary between the thick portion 31a and the thin portion 31b.
Therefore, it becomes easy to integrally form the protrusions 32 during resin molding of the extra-length storage tray 1.
That is, in the case where the holding rib is simply formed on the tray bottom plate as in the prior art, the core pin necessary for the mold is provided in order to form the protrusion on the opposing surface of the adjacent holding rib due to the surrounding shape. It becomes difficult. However, since the bottom plate through hole 33 is provided, it is possible to provide a core pin necessary for the mold to form the protrusion 32 by using the bottom plate through hole.
Further, when the optical connecting portion 30 held between the holding ribs 31 is taken out into the bottom plate through hole 33, the lower surface of the optical connecting portion 30 is pushed up from below the bottom plate through hole 33 with a stick or the like, thereby the optical connecting portion 30. There is also an effect that it becomes easy to take out the.
In the illustrated example of the optical connecting portion holding portion 8, the outermost holding rib 31 out of the five holding ribs 31 is different in the thickness of the intermediate holding rib 31 and the thick portion 31a, etc., but has the same reference numeral. It is attached.

As shown in FIG. 12, the optical connection portion 30 of the optical fiber core 20 introduced from the left and right optical fiber core entry / exit portions 5 and 6 in the extra length storage tray 1 is disposed in the optical connection portion holding portion 8. The extra length of the optical fiber 20 is, for example, when the optical connecting portion 30 is held by the upper optical connecting portion holding portion 8 in the same figure, as shown in FIG. When it is held by the lower optical connecting portion holding portion 8, it is stored as shown in FIG.
FIG. 9 shows a state in which the optical connection part 30 (30a, 30b) of the optical fiber is arranged in the optical connection part holding part 8 in FIG.
In the illustrated example, four rows of holding ribs 31 are provided with four optical connecting portion arrangement spaces, two of which are optical connecting portions (long and small diameter optical connecting portions) 30a of single-core optical fiber cores, and two places. The optical connection part (short and large diameter optical connection part) 30b of the multi-core optical fiber is disposed.
The long and small-diameter optical connection part 30a is fitted in the vicinity of both ends with a sufficient fit in the gap of the thick part 31a of the holding rib 31. The short and large-diameter optical connecting portion 30b is fitted with a margin in the gap between the thin portions 31b of the holding rib 31.
When a part of the extra length storage tray 1 stacked as shown in FIG. 13 is rotated around the hinge portion 16 with its upper surface opened as shown in FIG. If this is the same as the conventional structure, there is a risk that the optical connecting portions 30 a and 30 b will fall out of the gaps between the holding ribs 31.
However, since the protrusions 32a and 32b are provided on the upper surfaces of the adjacent holding ribs 31, the optical connection portions 30a and 30b are prevented from falling off by the protrusions 32a and 32b. That is, the protrusion 32a of the thick part 31a is prevented from coming off for the small and long optical connection part 30a (FIGS. 10 and 11), and the thin part 31b is used for the large diameter and short optical connection part 30b. The protrusion 32b is prevented from coming off (FIG. 10), and any optical connecting part is kept from coming off.

  Further, as in this embodiment, providing the protrusions 32a and 32b and the bottom plate through hole 33 in the vicinity of the boundary between the thick portion 31a and the thin portion 31b prevents the two types of optical connection portions 30a and 30b from falling off. It is suitable as a structure, and is also suitable not to unnecessarily widen the bottom plate through hole.

As described above, the bottom plate through-hole 33 makes it possible to provide a core pin necessary for the mold to form a protrusion on the holding rib, but also facilitates an operation of taking out the optical connecting portion 30. .
That is, when the optical connection part 30 is taken out from the gap between the holding ribs 31, the optical connection part 30 is grasped and taken out by the U-shaped notch 31 b ′ at the center of the thin part 31 b, but it may be difficult to take out. However, since the bottom plate through hole 33 is formed in the tray bottom plate 2, the optical connecting portion 30 can be pushed up from below the bottom plate through hole 33 with a stick or the like, and the optical connecting portion 30 can be easily taken out.

DESCRIPTION OF SYMBOLS 1 Extra length storage tray 2 Tray bottom plate 2a Hole 3, 4 Side wall 5, 6 Optical fiber core wire entrance / exit part 7 Extra length storage part 8 Optical connection part holding part 10 Hinge structure 11a, 11b, 11c, 11d, 11e Tongue piece 16 Pin 18 Pin hole 30 Optical connection part 30a Optical connection part of single-core optical fiber (long and small diameter optical connection part)
30b Optical connection of multi-core optical fiber (short and large diameter optical connection)
31 Holding rib 31a Thick part 31b Thin part 31b 'Notch 31c Enlarged part 32 Projection 32a Thick part protrusion 32b Thin part protrusion 33 Bottom plate through hole

Claims (6)

An optical connection part holding part for holding an optical connection part between optical fibers by fitting in a gap between holding ribs provided at intervals is provided on the tray bottom plate, and a hinge part provided on one side of the tray bottom plate is provided. In the surplus length storage tray of the resin molded product in which the surplus length storage trays stacked vertically are hinged to be openable and closable,
A surplus length storage tray, wherein a protrusion projecting inward is provided on an upper portion of an opposing surface of an adjacent holding rib.   2. The extra-length storage tray according to claim 1, wherein a bottom plate through hole having a shape and dimension including a portion having the protrusion when viewed from above is provided in a tray bottom plate between the holding ribs.   The surplus length storage tray according to claim 1 or 2, wherein a cross-sectional shape of the protrusion is a substantially equilateral triangle or an isosceles triangle.   The extra length storage tray according to any one of claims 1 to 3, wherein the protrusions are provided at two locations on both sides of the holding rib in the longitudinal direction.   The holding rib has a thick portion on both sides in the length direction and a thin portion in the middle, and holds a short and large-diameter optical connection portion with a wide gap formed between the thin portions. The narrow and narrow gap formed between the thick parts on both sides holds both sides of the long and small diameter optical connection part, and the protrusions are provided on the thick part and the thin part, respectively. The surplus length storage tray according to any one of claims 1 to 4. Protrusions provided in the thick part and thin part respectively, and bottom plate through holes provided corresponding to the protrusions are provided in the vicinity of the boundary between the thick part and the thin part on both sides of the holding rib in the longitudinal direction. The optical connection part holding structure according to claim 5.

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