JP2000292624A - Aerial installation type optical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical connection box installable on an existing self- support type cable without losing the function of the cable. SOLUTION: Clamps 3 clamping only a support line 1a without applying a clamping force on a main cable 1b of an existing self suspension type cable 1 are installed extrudingly on both sides on the upper face of an optical connection box 2. The clamp 3 comprises a pair of clamp pieces 3a, 3b connected by a hinge pin on the lower end for opening and closing, and are tightened by a screw 8 on the upper end. The pair of clamp pieces 3a, 3b have a clamping groove on the top of faces opposing each other, and a housing groove for the main cable 1b on the bottom of the faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical installation box which can be attached to an existing self-supporting cable.

[0002]

2. Description of the Related Art Conventionally, an optical connection box has been mounted on a telephone pole.

[0003]

However, the method of mounting on a utility pole has a problem that the mounting position cannot be secured when wires and cables are crowded or when other devices are already mounted. is there.

[0004] An object of the present invention is to pay attention to the fact that a self-supporting cable (either an optical cable or a metal cable can be used) is often installed on a line on which an optical connection box is to be installed. It is an object of the present invention to enable an optical connection box to be installed overhead using a self-supporting cable.

[0005]

In order to achieve this object, an overhead installation type optical connection box of the present invention applies a gripping force to a cable body of an existing self-supporting cable at a plurality of locations on the upper surface of the optical connection box. It is characterized in that a clamp for holding only the support wire without the projection is provided. With such a configuration, the optical connection box can be attached to the existing self-supporting cable, so that the installation position is not restricted, and even if the existing self-supporting cable is used, the cable can be used. There is no risk of damaging the cable body.

The clamp in the optical installation box according to the present invention comprises a pair of clamp pieces whose lower ends are connected to be openable and closable with hinge pins and whose upper ends are fastened with screws. The clamp piece has a holding groove for the support wire at an upper part of the surfaces facing each other and a storage groove for the cable body at a lower part, and one clamp piece has a fixing part to the optical connection box at a lower end part. Preferably has a hook portion for hooking a support wire at the upper end. With such a configuration, the work of attaching to the self-supporting cable is facilitated, and it is also possible to easily attach to self-supporting cables of different sizes.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] FIG. 1 shows an embodiment of an optical installation box according to the present invention, and FIGS. 2 and 3 show clamps used for the optical connection box. In the figure, 1 is an existing self-supporting cable stretched between telephone poles, and 2 is an optical connection box. The support wire 1a of the self-supporting cable 1 supports the cable main body 1b at an appropriate interval by a neck or suspension fitting (not shown) integrally formed with the sheath.

The optical connection box 2 comprises a box body 2a and a lid 2b, and clamps 3 are fixed to both ends of the box body 2a so as to protrude from the upper surface. Reference numeral 4 denotes a buckle for holding the lid 2b in a closed state, reference numeral 5 denotes a cable introduction portion formed in the box main body 2a, and reference numeral 6 denotes an optical cable introduced into the optical connection box 2.

The clamp 3 is composed of a pair of clamp pieces 3a and 3b as shown in FIGS. The lower ends of the pair of clamp pieces 3a and 3b are connected to be openable and closable by hinge pins 7, and the upper ends are fastened by bolts 8. A pair of clamp pieces 3a and 3b are provided on the upper surface of the surface facing each other with a support wire 1 of a self-supporting cable.
a holding groove 9 for holding the cable body 1b of the self-supporting cable loosely in the lower part. As shown in FIG. 2B, irregularities (vertical streaks) are formed on the inner surface of the holding groove 9 to prevent relative deviation from the support line 1a. Further, one clamp piece 3a has a fixing portion 12 to the optical connection box at a lower end portion, and a hook portion 13 for hooking a support wire at an upper end portion. The clamp 3 projects from the upper surface of the optical connection box 2 when the fixing portion 12 is fixed to the upper ends of both ends of the box main body 2a as shown in FIG.

Since this optical connection box is constructed as described above, when attaching it to the existing self-supporting cable 1, first, one clamp piece 3b is opened as shown in FIG. The part 13 is hooked on the support wire 1a. As a result, the optical connection box 2 is suspended from the support wire 1a.
And the bolts 8 are tightened, the support wire 1a can be gripped tightly. At this time, the cable body 1
b enters between the storage grooves 10 of the two clamp pieces 3a and 3b. However, since the storage grooves 10 are formed so that a gripping force is not applied to the cable body 1b, the cable body 1
b is not damaged.

The clamp 3 includes a pair of clamp pieces 3.
a and 3b are connected by hinge pins 7 and upper ends thereof are fastened by bolts 8. Further, since the structure has a holding groove 9 for the support wire 1a near the bolt fastening portion, the bolts 8 are used. It is possible to widen the tightening range, and it can be securely attached to the small-size self-supporting cable 1 as shown in FIG. 4A and the large-size self-supporting cable 1 as shown in FIG. Can be.

[Embodiment 2] FIG. 5 shows another embodiment of an optical installation box according to the present invention, and FIG. 6 shows a clamp used for the optical connection box. In the figure, 1 is an existing self-supporting cable stretched between telephone poles, 2 is an optical connection box, 2a is a box body of the optical connection box 2, 2b is a lid, 3 is a clamp fixed to the box body 2a, 4 is a buckle for holding the lid 2b in a closed state, 5 is a cable introduction section formed in the box body 2a, 6
Is an optical cable introduced into the optical connection box 2.

The clamp 3 comprises a fixed clamp member 21a and a movable clamp member 21 as shown in FIGS.
b. Both members 21a and 21b are formed by punching (or cutting out) and bending a metal plate. The fixed clamp member 21a has a fixed plate 23 fixed at one end of the front plate 22 to an end surface of the box body 2a by screwing, and has two hook plates 24 on the back side of the front plate 22. I have. The two hook plates 24 have hook portions 25 obliquely downward.

The movable clamp member 21b is disposed between the two hook plates 24, and has a holding piece 26 at the lower end for holding the support wire 1a together with the hook 25.
A bolt 27 is passed through the fixed clamp member 21a and the movable clamp member 21b. The head of the bolt 27 is on the side of the movable clamp member 21b, and the nut 28 is screwed to the fixed clamp member 21a of the bolt 27.
A detent part 29 is formed on the movable clamp member 21b so as to press both sides of the head of the bolt 27.
Therefore, when the nut 28 is rotated in the tightening direction, the movable clamp member 21b is drawn toward the fixed clamp member 21a, and when the nut 28 is rotated in the loosening direction, the movable clamp member 21b can be separated from the movable clamp member 21b. .

Since the overhead optical connection box is configured as described above, when attaching the optical connection box to the existing self-supporting cable 1, first loosen the nut 28 and move the movable clamp member 2.
The hook portion 25 is hooked on the support wire 1a with the 1b separated from the movable clamp member 21b. As a result, the optical connection box 2 is suspended from the support wire 1a.
The holding piece 26 grips the support wire 1a. When the clamp 3 grips the support wire 1a, the cable body 1b
Is placed on the upper surface of the box body 2a, and the cable body 1
No gripping force is applied to b.

[0016]

As described above, according to the present invention, since the optical connection box can be attached to the existing self-supporting cable, the restrictions on the installation position of the optical connection box are reduced.
The installation position can be easily selected. Although the existing self-supporting cable is used, the function of the existing cable is not impaired since no gripping force is applied to the cable body.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an aerial installation type optical connection box according to the present invention.

2A is a front view of a clamp used in the overhead installation type connection box of FIG. 1, and FIG. 2B is an inner view of one clamp piece of the clamp.

FIG. 3 is a front view showing a state where the clamp of FIG. 2A is opened.

4A is a front view showing a state in which the clamp of FIG. 2A is attached to a small-size self-supporting cable, and FIG. 4B is a front view showing a state in which the clamp is attached to a large-size self-supporting cable.

FIG. 5 is a perspective view showing another embodiment of the overhead installation type optical connection box according to the present invention.

6 (a) is a plan view, FIG. 6 (B) is a front view, and FIG. 6 (c) is a side view of the clamp used for the overhead installation type connection box of FIG.

[Explanation of symbols]

 1: Self-supporting cable 1a: Support wire 1b: Cable main body 2: Optical connection box 3: Clamp 3a, 3b: Clamp piece 5: Cable introduction part 6: Optical cable 7: Hinge pin 8: Bolt (screw) 9: Grip groove 10 : Storage groove 12: Fixed part to optical connection box 13: Hook part 21 a: Fixed clamp member 21 b: Movable clamp member 24: Hook plate 25: Hook part 25: Pressing piece

Continued on the front page (72) Inventor Takashi Kawamura 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Naoya Yamazaki 4-1-1 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu F term in reference (reference) 2H038 CA38 CA65 5G361 AA07 AB12 AC05 AE02

Claims (3)

[Claims] 1. A clamp for gripping only a support wire (1a) without applying a gripping force to a cable body (1b) of an existing self-supporting cable (1) at a plurality of locations on an upper surface of an optical connection box (2). A fictitious installation type optical connection box characterized by projecting (3). The clamp (3) has a pair of clamp pieces (3) whose lower ends are openably and closably connected by hinge pins (7) and whose upper ends are fastened by screws (8).
a, 3b), this pair of clamp pieces has a holding groove (9) for the support wire at the upper part of the surfaces facing each other, and a storage groove (10) for the cable body at the lower part, and one of the clamp pieces has one. The clamp piece (3a) has a fixing part (12) to the optical connection box (2) at the lower end, and a hook part (1) for hooking the support wire at the upper end.
The optical connection box according to claim 1, wherein the optical connection box has the following configuration. The clamp (3) comprises a fixed clamp member (21a) fixed to the optical connection box (2) and a movable clamp member (21b), and the fixed clamp member (21a).
Has two hook plates (24), the movable clamp member (21b) is disposed between the two hook plates (24),
The two hook plates (24) have a hook portion (25) for hooking a support line obliquely downward, and the movable clamp member (21).
b) has a holding piece (26) at the lower end, and the fixed clamp member (21a) and the movable clamp member (21b) are tightened by bolts (27) and nuts (28) penetrating them. The optical connection box according to claim 1, wherein