JPH08194120A - Connecting box for optical fiber cable - Google Patents

Abstract

PURPOSE: To attain a size reduction, miniaturization and cost reduction without adversely affecting transmission characteristics even by rotation of connecting and housing trays by making the above connecting box mountable and dismountable by a simple operation. CONSTITUTION: This connecting box is constituted by stacking plural sheets of the connecting and housing trays 1 in multiple stages. Each connecting and housing tray 1 has side plates of a proper height on its circumference and is formed with an introducing part 6 for a coated optical fiber (a) by notching the central part of the one side plate 14. The coated optical fibers (a), (a) are introduced along the outer side of the side plates 14 from both ends into the connecting and housing tray 1 from the introducing part 6 at the center. Connecting parts 31 for freely rotatably connecting the connecting and housing trays 1 to each other are formed on both sides of the side plates 14 formed with the introducing parts 6. These connecting parts 31 are so formed as to be made freely attachable and detachable by fitting cross shafts into bearings having a recessed shape. Fitting parts 32 for fixing the opening and closing of the connecting and housing trays 1 are mounted at the central parts of the other side plates 15 facing the introducing parts 6 so that fixing with one operation is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable junction box.

[0002]

2. Description of the Related Art In the case where a straight connection or a branch connection between optical fiber cables or a connection between an optical fiber cable and an optical cord for drawing into equipment is carried out, a connection portion and an extra length of an optical fiber core wire are stored. In addition, the connection box is used.

As shown in FIG. 5, the conventional connection box disclosed in Japanese Patent Publication No. 6-3487 has a plurality of connection storage trays 1 for accommodating the extra connection length b of the optical fiber core a in multiple stages. The connection storage trays 1 are stacked and connected by a hinge 17 so as to be rotatable. The introduction portion 6 of the optical fiber core wire a is provided so as to be offset to one end side of the both end plates 18.

When connecting the optical fiber cables A and A'using these connection boxes, first, the cable jackets of the two optical fiber cables A and A'to be connected are connected to each other at both ends of the connecting plate 3. After fixing to the holding metal fitting 4, the optical fiber core wire a is introduced into the connection storage tray 1 to connect the optical fiber core wires to each other by the connector 5, and then the extra connection length portion b of the optical fiber core wire a is looped. It is wound and stored in the connection storage tray 1, and the connection work is sequentially performed from the lower stage to the upper stage.

When the work of connecting the optical fiber core wires a is completed, finally, as shown in FIG. 6, the connecting projections 21 provided on the respective connection storage trays 1 are engaged with each other by the fixing band 22, and the respective storage housings are stored. The tray 1 is fixed to the connecting plate 3.

[0006]

However, the hinge connection system described above has the following problems.

(1) In the narrow space between the holding metal fitting 4 and the connection storage tray 1, the extra storage portion c of the optical fiber core wire a.
However, as shown in FIG. 6, it is rotated and bent, which causes a problem that transmission characteristics are adversely affected.

(2) Since the optical fiber core wire introducing portion 6 is provided on one end side of both end plates 18 of the connection storage tray 1,
The distance between the grip 4 and the connection storage tray 1 needs to be set in consideration of the allowable curvature of the optical fiber core a, which is a factor that makes the longitudinal dimension of the connection box unnecessarily large.

(3) Since the connection accommodating trays 1 and 1 are hinge-coupled to each other, in order to connect and disconnect the connection accommodating trays 1, it is necessary to remove and insert the hinge pin, which is troublesome. It is troublesome.

(4) In order to fix each connection storage tray 1, a complicated operation of engaging the connecting projections 21 provided on each connection storage tray 1 with the fixing band 22 is required.

An object of the present invention is to solve the above-mentioned problems of the prior art, to prevent the transmission characteristics from being adversely affected even by the rotation of the connection storage tray, and to reduce the size, size and cost of the optical fiber cable. To provide a connection box.

Another object of the present invention is to provide an optical fiber cable connection box in which the connection and storage trays can be easily positioned relative to each other.

Another object of the present invention is to provide a connection box for an optical fiber cable in which the connection storage tray can be fixed with one touch.

[0014]

A connection box for an optical fiber cable according to the present invention comprises a plurality of connection storage trays for accommodating the extra connection length portion of an optical fiber core, which are stacked in multiple stages, and one side plate of each connection storage tray. In a connection box of optical fiber cables in which they are rotatably connected to each other, an introduction portion of an optical fiber core wire is provided at the center of the one side plate of each connection storage tray.

In this case, concave bearings are provided on the outer surface upper portions of the side plates on both sides of the introduction portion of the optical fiber core, and a horizontal shaft is provided on the lower portion of the outer surface so as to project downward from the lower edge. When the trays are stacked, the horizontal shaft protruding from the lower part of the upper connection storage tray is fitted to the concave bearing provided on the upper part of the lower connection storage tray. Each connection storage tray was rotatably connected, and a protrusion was provided on the upper edge of the other side plate facing the introduction part of the optical fiber core, and a groove was provided on the lower edge, and the connection storage trays were stacked and closed. In this state, the protrusion provided on the upper edge of the lower connection storage tray is inserted into the groove provided on the lower edge of the upper connection storage tray so that the upper and lower connection storage trays can be positioned in the horizontal direction. Is preferred.

Further, an arcuate convex portion is provided on an upper portion of the outer surface of the other side plate, and a tongue having an arcuate concave portion on the back side is provided on the lower portion of the outer surface so as to protrude below the lower edge.
In the state where the connection storage trays are stacked and closed, slide the tongue provided on the lower part of the upper connection storage tray to the arc-shaped projection provided on the upper part of the lower connection storage tray, It is preferable that the arcuate projections are fitted into the arcuate recesses on the back side to fix the upper and lower connection storage trays.

[0017]

In the connection box constructed as described above, the optical fiber core wire introduction portion is provided at the center of the side plate of the connection storage tray, and the storage extra length of the optical fiber core wire before being introduced into the connection storage tray is accommodated. Since the sufficient length of the section is secured, it is possible to more effectively prevent the adverse effect of the transmission characteristics of the optical fiber core wire due to the rotation of each connection storage tray, and it is possible to shorten the interval between the gripping fitting and the connection storage tray. .

Further, since the connection storage trays are connected by simply fitting the protruding horizontal shafts into the concave bearings, the connection is facilitated, and the connection is released only by lifting the connection portion, so the connection is made. It can be released easily.

Further, in particular, as the opening / closing fixing structure of the connection storage tray, the protrusion of the connection storage tray is inserted into the groove portion so as to regulate the displacement in the left-right direction. The storage tray can be positioned.

Further, since the tongue piece is slid to the arcuate convex portion of the connection storage tray so as to be fitted in the concave portion on the back side of the tongue piece, the upper and lower connection storage trays can be fixed with one touch.

[0021]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 4 is a plan view showing the whole connection box of the optical fiber cable. Two optical fiber cables A,
After fixing the cable sheathes A'to each other to the holding metal fittings 4 and 4 at both ends in the connection box 13, the optical fiber core a is introduced into the connection storage tray 1 and the optical fiber cores are connected to each other by the connector 5. Then, the extra connection length portion b of the optical fiber core a is wound in a loop shape and stored in the connection storage tray 1.

As shown in the side view of FIG. 1B, a plurality of connection storage trays 1 are stacked in multiple stages and rotatably connected to each other. In addition, as shown in the plan view of FIG. 1A, the connection storage tray 1 has a side plate having an appropriate height around the periphery thereof, and a central portion of one side plate 14 is cut away to form the optical fiber core a. The introduction part 6 is formed. Optical fiber core a
Is arranged along the outside of the side plate 14 from the holding metal fittings 4 at both ends, and is introduced into the connection storage tray 1 from the introduction portion 6 at the center.

The wiring method for the storage length c of the optical fiber core wire a is not limited to this method, and wiring may be performed from below the side plate 14 to the introduction portion 6 from the grip fitting 4 through the bottom of the connection storage tray 1. Good.

Coupling portions 31, 31 for rotatably coupling the connection storage trays 1 to each other are attached to both sides of the one side plate 14 on the side where the optical fiber core wire introducing portion 6 is formed. Further, a fitting portion 32 for opening / closing fixing of the connection storage tray 1 is attached to the central portion of the other side plate 15 facing the introduction portion 6.

As shown in FIG. 2, the connecting portion 31 formed on the side plate 14 on which the optical fiber core wire introducing portion 6 is formed has a concave shape provided along the upper edge on the outer surface upper portion of the side plate 14. The shaped bearing 7 and the lateral shaft 8 that is provided below the outer surface of the side plate 14 along the lower edge and project below the lower edge. When the connection storage trays 1 are stacked, the lower connection storage tray 1
The horizontal shaft 8 provided at the lower part of the upper connection storage tray 1 is fitted to the concave bearing 7 provided at the upper part of each connection storage tray 1
Are rotatably connected to each other. Further, when the connecting portion 31 is lifted with an appropriate force, the connecting portion 31 can be detached.

On the other hand, as shown in FIG. 3, the fitting portion 32 provided in the central portion of the side plate 15 facing the optical fiber core wire introducing portion 6 first has a convex shape provided on the upper edge of the side plate 15. With the protrusion 9 and the groove 10 provided at the lower edge, the protrusions 9 provided on the upper part of the lower connection storage tray 1 are connected to the upper connection storage tray in a state where the connection storage trays 1 are stacked and closed. 1 is inserted into the groove portion 10 provided in the lower portion of the connection storage tray 1 to regulate the lateral displacement between the connection storage trays 1. This is useful for eliminating the lateral shift that occurs because the connecting portion 31 of the connection storage tray 1 has a configuration in which the horizontal shaft 8 is simply fitted into the concave bearing 7.

Next, the fitting portion 32 has an arc-shaped convex portion 11 provided on the upper portion of the outer surface of the side plate 15 and an arc-shaped concave portion 16 on the lower portion of the outer surface of the side plate 15 on the back side. With the tongue piece 12 projecting downward, the connection storage trays 1 in the upper stage are connected to the arc-shaped projections 11 provided in the upper part of the connection storage tray 1 in the lower stage in a state where the connection storage trays 1 are stacked and closed. The tongue piece 12 provided at the lower portion of the tongue piece 12 is slid to fit the arcuate convex portion 11 into the arcuate concave portion 16 on the back side of the tongue piece 12, and the upper and lower connection storage trays 1 are fixed to each other.

According to the present embodiment, even if the arbitrary connection storage tray 1 is opened and rotated for repair or the like after the connection work, the optical fiber core wire a can be introduced due to the cable introduction form from the central portion of the connection storage tray 1. It is possible to sufficiently secure the length of the storage surplus portion c (the distance from the pull-out point from the optical fiber cables A and A ′ to the introduction portion 6 provided at the center of the side plate of the connection storage tray 1). It is possible to work with peace of mind without deteriorating transmission identification.

Further, since the introduction portion 6 of the optical fiber core wire a is provided in the central portion of the connection storage tray 1, by devising the arrangement of the cable jacket holding metal fitting 4 and the connection storage tray 1,
The distance between the two can be reduced, and the size of the junction box 13 in the longitudinal direction can be made compact.

Further, by stacking the connection storage trays 1 and simply fitting the horizontal shaft 8 provided at the lower portion of the connection storage tray 1 at the upper stage to the bearing 7 provided at the upper portion of the connection storage tray 1, each connection is connected. The storage trays 1 can be rotatably connected to each other,
Also, by simply lifting the connecting portion 31 with an appropriate force, the connecting portion 3
Since 1 is detached, it does not take time and effort to remove and insert the hinge pin and the like, and it is convenient to attach and detach.

As a structure for opening and closing the connection storage trays 1 in the upper and lower stages, a protrusion 9 is provided in the center of the side plate facing the introduction portion 6 of the optical fiber core a, and the protrusion 9 is formed in the groove 1.
Since the connection storage trays 1 are inserted into the connection storage trays 0, the horizontal displacement between the connection storage trays is eliminated, and the connection storage trays 1 can be easily stacked.

To fix the connection storage tray 1,
It suffices to apply an appropriate pressing force to the upper connection storage tray 1 and slide the tongue piece 12 provided at the center of the side plate into the arcuate convex portion 11 of the lower connection storage tray 1 to fit it. 1 can be opened by lifting the tongue piece 12 so that it is opened lightly and releasing the fitting. In both cases, the complicated operation of pulling out and inserting the hinge pin is not required, so the operability is remarkably improved. Become.

As described above, as the rotating structure and the open / close fixing structure of the connection storage trays, basically, the connection storage trays are stacked, fixed, and freely rotatable by combining the concavo-convex shape bodies.
Since it can be detached and freely opened and closed, the connection storage tray can be downsized, and the connection storage tray can be assembled and connected easily.

In the above embodiment, the optical fiber core wire a is fed from the side surface of the connection box 13 to the central introduction portion 6 of the connection storage tray 1.
However, even if the mounting portion of the cable gripping metal fitting 4 is located below the connection storage tray 1, the optical fiber core a
Can be introduced into the central introduction part 6 of the connection storage tray 1.

Further, the above-mentioned concave bearing and the horizontal shaft, the protrusion and the groove, or the arc-shaped protrusion and the tongue may be installed at opposite positions.

[0037]

According to the present invention, since the introduction portion of the optical fiber core wire for the connection storage tray is provided at the center of the tray,
Rotating the connection storage tray does not adversely affect the transmission characteristics of the optical fiber. Further, since the introduction portion of the optical fiber core wire with respect to the connection storage tray is provided in the center, the dimension of the connection box in the longitudinal direction can be reduced, and the connection box can be downsized and the cost can be reduced. Furthermore, the connection storage trays of the connection box can be easily and rotatably stacked in multiple stages by a simple operation of fitting a horizontal shaft protruding from a concave bearing.
Further, it is convenient that the connected connection storage trays can be individually removed without removing the hinge pin or the like.

Further, since the projection of the connection storage tray is inserted into the groove, the horizontal positioning between the upper and lower connection storage trays becomes easy.

Furthermore, since the tongue piece is slid into the arc-shaped convex portion of the connection storage tray and fitted into the recessed portion on the back side of the tongue piece, the upper and lower connection storage trays can be fixed and released with one touch. it can.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a connection storage tray which constitutes a connection box of an optical fiber cable according to the present invention,
(A) is a plan view and (b) is a side view showing a state in which an upper stage of the stacked connection storage trays is opened.

2A and 2B are explanatory views of a main part showing a stacked state of the connection storage trays according to the present embodiment, FIG. 2A is a front view showing a rotated state, FIG. 2B is a side view, and FIG.

FIG. 3 is an explanatory view of a main part showing a fixed state of the connection storage trays according to the present embodiment, in which (a) is a plan view, (b) is a side view, and (c) is a perspective view.

FIG. 4 is a plan view showing an example of use of a connection box for an optical fiber cable according to the present invention.

FIG. 5 is a perspective view showing a connection box of a conventional hinge-type optical fiber cable.

6 is a side view showing a rotating state of the hinged connection storage tray of FIG.

[Explanation of symbols]

 A, A ′ Optical fiber cable a Optical fiber core b Connection extra length c Storage extra length 1 Connection storage tray 4 Grip fitting 5 Connector 6 Introducing part 7 Recessed bearing 8 Horizontal shaft 9 Protrusion 10 Groove 11 Arc Convex part 12 Tongue piece 13 Connection box 14 Side plate 15 Side plate 16 Arc-shaped concave part

Claims (3)

[Claims] 1. A connection box for an optical fiber cable, wherein a plurality of connection storage trays for accommodating extra connection lengths of optical fiber cores are stacked in multiple stages and one side plate of each connection storage tray is rotatably connected. 2. An optical fiber cable connection box according to claim 1, wherein an introduction portion of the optical fiber core wire is provided at the center of the one side plate of each connection storage tray. 2. A connection box for an optical fiber cable according to claim 1, wherein concave bearings are provided on upper outer surfaces of side plates on both sides of the introduction portion of the optical fiber core, and a horizontal axis is provided on a lower outer surface. With the connection storage trays stacked below the lower edge, stack the connection storage trays, and fit the horizontal shaft protruding from the bottom of the connection storage tray on the upper stage into the concave bearing provided on the upper side of the connection storage tray on the lower stage. In the fitted state, the connection storage trays are rotatably connected about the horizontal axis in the fitted state, a protrusion is provided on the upper edge of the other side plate facing the optical fiber core lead-in portion, and a groove is formed on the lower edge. With each connection storage tray stacked and closed, insert the protrusion on the upper edge of the lower connection storage tray into the groove on the lower edge of the upper connection storage tray, and connect the upper and lower connections. Position the storage tray horizontally Junction box of an optical fiber cable, characterized in that the wear manner. 3. The optical fiber cable junction box according to claim 1, further comprising an arcuate convex portion provided on an upper portion of an outer surface of the other side plate, and an arcuate concave portion provided on a lower portion of the outer surface. With the tongue on the back side protruding downward from the lower edge and stacking and closing the connection storage trays, the upper connection storage tray is connected to the arc-shaped convex portion provided on the upper part of the lower connection storage tray. The tongue provided on the lower part of the tongue is slid, and the arcuate convex portion is fitted into the arcuate concave portion on the back side of the tongue piece to fix the upper and lower connection storage trays. Fiber optic cable junction box.