JP2560577Y2 - Optical cable tow gripping tool - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical cable pulling and gripping tool (hereinafter, referred to as a "grip tool") for gripping and pulling an optical fiber cable (hereinafter, referred to as an "optical cable") from a side surface thereof.

[0002]

2. Description of the Related Art FIG. 6 is a cross sectional view showing an optical cable laid in a manhole. As shown, an optical cable 82 laid in a conduit 80 is connected to a manhole 84.
Is mounted on the cable receiving hardware 88 along the inner wall 86 of the cable. That is, it is necessary to insert the optical cable 82 into the conduit 80 as shown by a dashed line and then to make the optical cable 82 slack by an amount shown by a solid line (extra length work). In this operation, several workers grasped the optical cable 82 by hand and pulled it as it was.

[0003]

However, such an operation of pulling an optical cable is a complete manual operation, so the workability is poor, and the optical fiber is very brittle, so that an unskilled worker may damage the optical fiber. Sometimes it happened. Therefore, an object of the present invention is to provide a gripping tool that can improve workability and prevent damage to an optical fiber during work.

[0004]

The gripping tool according to the present invention is composed of two blocks, an optical cable receiving groove is formed on the opposite side of each block, and an inclined surface is formed outside each block. A gripping member having a wedge-shaped outer shape, a connecting member for connecting the two blocks openably and closably and urging the two blocks in a closing direction, A case in which a wedge-shaped inner wall in which the interval between the two blocks is narrowed in accordance therewith, and a locking member detachably attached to the wedge-shaped inner wall to stop the gripping member from sliding in the insertion direction. It is. Further, the connecting member may include a shaft fixed to one of the two blocks and slidably penetrating the other of the two blocks, and a spring for urging the two blocks in the closing direction.

[0005]

The two blocks constituting the holding member are opened by hand against the urging force of the connecting member, and the optical cable is inserted into the optical cable receiving groove. When the hands are released from the two blocks, the optical cable is gripped between the two blocks by the urging force of the connecting member. In this state, the gripping member is inserted into the case and the case is pulled in the pulling direction. Then, since the optical cable is hard to move due to its own weight, the gripping member slides on the wedge-shaped inner wall, and the interval between the two blocks is reduced according to the amount of pushing, thereby increasing the gripping force on the optical cable. The sliding of the gripping member is stopped at a predetermined portion by the locking member, and the lateral pressure of the optical cable is set to a predetermined value.

[0006]

1 to 5 show an embodiment of a gripping tool according to the present invention. FIG. 1 is an overall perspective view, FIG. 2 is an exploded perspective view,
3 is a vertical sectional view taken along the line III-III in FIG. 1, FIG. 4 is a vertical sectional view showing a state where two blocks are opened, and FIG. 5 is a vertical sectional view taken along a line VV in FIG. Hereinafter, a detailed description will be given based on these drawings.

The gripping tool 10 according to the present invention is composed of blocks 12a and 12b, and optical cable receiving grooves 14a and 14b are formed on opposite sides of the blocks 12a and 12b, and an inclined surface 1 is formed outside the blocks 12a and 12b.
A gripping member 18 having a wedge-shaped outer shape on which 6a and 16b are formed;
A connecting member 2 for connecting the blocks 12a and 12b to be freely opened and closed and for urging the blocks 12a and 12b in the closing direction.
0, a case 24 formed with wedge-shaped inner walls 22a, 22b in which the gripping member 18 is slidably inserted and the distance D between the blocks 12a, 12b is narrowed according to the amount of pushing, and
A locking member 26 is attached to the wedge-shaped inner walls 22a and 22b so as to be detachable and stops the gripping member 18 from sliding in the insertion direction. The connecting member 20 includes a shaft 30 fixed to the block 12a and slidably penetrating the block 12b, and a spring 32 for urging the blocks 12a and 12b in the closing direction.

The blocks 12a and 12b are made of a metal such as aluminum, and have optical cable receiving grooves 14a and 14a formed of a rubber sleeve having a semicircular cross section on their opposing surfaces.
4b is provided. In blocks 12a and 12b,
Wide front faces 40a, 40b and narrow rear faces 42a, 4b
2b are formed with the inclined surfaces 16a and 16b interposed therebetween, and the front surfaces 40a and 40b are in the traction direction.

The connecting member 20 includes blocks 12a and 12b.
Are provided on the upper protrusions 44a and 44b. Protruding piece 4
4a and 44b are provided with small balls 46a and 46b embedded in the holes together with compression springs,
And a stopper 50 having one end attached thereto. An engagement hole 52 is formed in the other end of the stopper 50, and the engagement hole 52 is normally engaged with the small ball 46a. However, when the blocks 12a and 12b are held in an open state, The engagement hole 52 is engaged with the small ball 46b. The spring 32 is a compression spring, and is fitted between the block 12b and the head 54 of the shaft 30.

The case 24 is formed by bending a stainless steel plate or the like, has an opening 56 formed in a wide front, and projects further forward of the opening 56 so that a piece 58 is bent and extended.
A chain 60 as a locking tool is attached to the protruding piece 58. Behind the opening 56, the wedge-shaped inner walls 22a, 2
2b is formed. Hook pieces 62a and 62b are formed on the upper portions of the wedge-shaped inner walls 22a and 22b, a bottom surface 64 is formed on the lower portion, and a narrow locking surface 66 is formed on the rear side.
The locking surface 66 is cut out in a U-shape so that the optical cable 82 can be inserted.

The locking member 26 is made of a substantially U-shaped metal such as aluminum, and has a wide front surface 68 and a narrow rear surface 7.
0, small inclined surfaces 72a, 72 between the front surface 68 and the rear surface 70
b, a U-shaped groove 74 or the like large enough to insert the optical cable 82 is formed. The locking member 26 is detachably attached to the wedge-shaped inner walls 22a and 22b so as to abut on the locking surface 66. Further, it can be positioned away from the locking surface 66 by small screws 76a and 76b screwed from outside the locking surface 66. Further, the length L from the front surface 68 to the rear surface 70 of the locking member 26 differs depending on the diameter of the optical cable 82.

Next, the operation of the gripping tool 10 will be described. If necessary, the locking member 26 is inserted through the opening 56 of the case 24. The locking member 26 is configured such that the rear surface 70 has the locking surface 66.
In addition, the small inclined surfaces 72a, 72b have wedge-shaped inner walls 22a, 22b.
Contact each other. The blocks 12a and 12b constituting the gripping member 18 are opened by hand against the urging force of the spring 32 of the connecting member 20 (FIG. 4), and the optical cable 82 is inserted into the optical cable receiving grooves 14a and 14b. Blocks 12a, 1
When the hand is released from 2b, the optical cable 82 is gripped between the blocks 12a and 12b by the urging force of the spring 32. In this state, the holding member 18 is inserted through the opening 56 of the case 24. When the case 24 is pulled in the pulling direction, the optical cable 82 is hard to move due to its own weight.
8 slides on the wedge-shaped inner walls 22a, 22b. Then
The inclined surfaces 16a, 16b of the blocks 12a, 12b are pressed by the wedge-shaped inner walls 22a, 22b in accordance with the amount of the gripping member 18 pressed into the case 24, and the distance D between the blocks 12a, 12b is reduced, and the gripping force on the optical cable 82 is reduced. Becomes larger. The sliding of the gripping member 18 is
When the rear surfaces 42a, 42b of the locking members 26 a, 12b come into contact with the front surfaces 74 of the locking members 26, they stop. Therefore, the side pressure of the optical cable 82 is set to a predetermined value by the length L of the locking member 26. In this manner, the optical cable 82 can be pulled by hooking the chain 60 on a cable stretcher or the like. The holding of the optical cable 82 can be performed very easily by the action of the connecting member 20. Also, the cable receiving groove 14a,
14b is made of a rubber sleeve having a semicircular cross section,
The pressure on the optical fiber of the optical cable 82 can be buffered.

In order to grip the optical cable 82 having a large diameter, the locking member 26 having a large length L is used, so that the amount of pushing of the gripping member 18 into the wedge-shaped inner walls 22a, 22b can be reduced, and the blocks 12a, The interval D of 12b is increased. Similarly, to hold the optical cable 82 having a small diameter, the locking member 26 having a small length L is used. Also,
According to the diameter of the optical cable 82, the cable receiving groove 14
The diameters of a and 14b may be changed.

The inclined surface 1 of the blocks 12a and 12b
2a and 12b are not limited to the planes shown in this embodiment, but may be curved surfaces. Therefore, the gripping member 18 may have a frustoconical wedge-shaped outer shape.

[0015]

According to the gripping tool according to the present invention, the optical cable can be easily attached and detached without breaking the two blocks, so that the extra work of the optical cable can be efficiently performed. In addition, by changing the locking member, the side pressure of the optical cable can be set to a predetermined value according to the diameter of the optical cable, and damage to the optical cable during extra length work can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of a gripping tool according to the present invention.

FIG. 2 is an exploded perspective view showing an embodiment of the gripping tool according to the present invention.

FIG. 3 is a vertical sectional view taken along line III-III in FIG.

FIG. 4 is a longitudinal sectional view showing a state where two blocks are opened.

FIG. 5 is a longitudinal sectional view taken along the line VV in FIG. 1;

FIG. 6 is a cross-sectional view showing an optical cable laid in a manhole.

[Explanation of symbols]

10 gripping tools 12a, 12b ...
Blocks 14a, 14b ... optical cable receiving grooves 16a, 16b ...
Inclined surface 18 ... Grip member 20 ... Connecting member 22a, 22b ... Wedge-shaped inner wall 24 ... Case 26 ... Locking member 30 ... Shaft 32 ... Spring

Claims (2)

(57) [Scope of request for utility model registration] 1. A wedge-shaped gripping member comprising two blocks, wherein an optical cable receiving groove is formed on the opposite side of each block, and an inclined surface is formed on the outside of each block. A connecting member for connecting the blocks so that they can be opened and closed and for urging the two blocks in the closing direction;
A case in which a wedge-shaped inner wall is formed in which the gripping member is slidably inserted and the distance between the two blocks is reduced in accordance with the amount of pushing, and a wedge-shaped inner wall is detachably attached to the wedge-shaped inner wall, and the fitting of the gripping member is performed. An optical cable tow gripping tool comprising: a locking member for stopping sliding in a direction. 2. The optical cable according to claim 1, wherein the connecting member comprises a shaft fixed to one of the two blocks and slidably penetrating the other of the two blocks and a spring for urging the two blocks in the closing direction. Tow gripping tool.