JP2878235B2 - Guide device for cable aerial installation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable aerial laying guide device, and more particularly to a cable aerial laying guide device capable of preventing a cable from hanging down due to its own weight when the cable is laid aerial on a utility pole.

[0002]

2. Description of the Related Art Conventionally, a wheel has been used for laying a cable along a utility pole. As shown in FIG. 6, a plurality of such wheels are attached to existing cables and support wires 52 laid between utility poles 51, 51. Multiple gold wheels 5
After the attachment 3 is attached to the support wire 52, a pulling rope 58 is inserted through each wheel 53, and one end of a connection fitting 57 is fixed to the rear end. The distal end of the cable 56 pulled out from the cable drum 55 by the cable feeding device 54 is fixed to the other end of the connection fitting 57. This cable 56
Is connected to the tow rope 58 via the connection fitting 57,
The cable 56 is extended by being pulled by the towing device 59 and wound by the towing rope winding device 60.

[0003] In order to prevent the cable 56 and the tow rope 58 from sagging due to their own weight, the wheel 53 is 5 to 5 mm.
They are mounted at 6 m intervals.

[0004]

However, the gold wheel 5
Since the mounting interval of 3 is 5 to 6 m, the longer the cable length to be laid, the larger the number of wheels 53 to be mounted, which requires a great deal of labor. On the other hand, if the installation interval of the wheel & pinion 53 is widened, the cable 53 being extended hangs down due to its own weight, so that it is expected that traffic of vehicles and passersby on the ground will be hindered.

[0005] In order to efficiently mount the wheel 53 to the support wire 52 extended to a high place, a ground access wheel using a long rod from the ground to mount the wheel is also being developed. However, there is a problem in a method of fixing the support wire 52 to the support wire 52, and the reliability is lacking. In order to solve such difficulties, a cable wheel with a braking mechanism (Japanese Patent Laid-Open No. 5-328) has been proposed.
553) and a gold wheel with a braking function (Japanese Patent Laid-Open No. 8-1571).
No. 89) has been proposed.

A cable wheel with a braking mechanism (Japanese Patent Laid-Open No. Hei 5-32)
No. 8553) includes a brake body having a cam surface which abuts on a cable surface and prevents backward movement thereof. The brake does not provide braking when the cable is pulled in the direction of extension, but engages when the cable moves in the direction opposite to the direction of extension. However, since the cable wheel with a braking mechanism does not operate unless the cable moves in the opposite direction, it cannot cope with the cable hanging in the extension direction without moving in the opposite direction.

[0007] Further, a gold wheel with a braking function (Japanese Patent Laid-Open No. 8-157)
No. 189) is provided with a rotating body which is positioned above a wheel roller where the cable is placed and sent out and rotates while pressing the intersecting cable, and a mechanism for preventing free rotation of the rotating body. This mechanism for preventing the free rotation of the rotating body does not prevent the free rotation of the rotating body when the cable is pulled in the extension direction, but prevents the free rotation of the rotating body when the cable stops. . However,
Since this wheel with a braking function does not operate unless the cable stops, it cannot cope with the cable hanging down in the extension direction without moving in the opposite direction as in the case of the cable wheel with a braking mechanism described above. .

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. By applying tension to a cable in a direction opposite to the extending direction, the cable in the extension line hangs down by its own weight. It is an object of the present invention to provide a cable aerial laying guide device capable of preventing the above.

[0009]

A cable aerial laying guide device according to the present invention that achieves the above object is disposed at a rising portion where a cable to be laid is erected from the ground and overhead.
A cable aerial laying guide device for guiding a cable in an extending direction, wherein the belt is provided with a curvature greater than an allowable bending radius of the cable, a belt abuts on an inner diameter side of the cable and cooperates with the cable, and a belt on an outer diameter side of the cable. Pressing means for pressing the cable against the belt with the movement of the cable in contact with the belt; a plurality of pulleys rotating with the movement of the cable around which the belt is wound and pressed against the belt by the pressing means; Torque control means for controlling the rotational torque of at least one of the pulleys located at both ends to apply tension to the cable guided by the belt in the direction opposite to the extending direction.

[0010] In the cable aerial laying guide device of the present invention, the torque control means is preferably provided on pulleys downstream of the pulleys located at both ends. Also,
In the cable aerial laying guide device of the present invention, the pressing means is located between the first arm having the rollers rotatably supported at both ends and the roller of the first arm.
And a second arm rotatably supported. The base end of the second arm has a distance between the belt and each roller as each roller of the first arm moves downstream. It is preferred that the belt is continuously rotatable at a position where the distance between the belt and each roller becomes smaller than or equal to the outer diameter of the cable as the distance between the belt and the pulley located downstream of the pulley located at both ends decreases. In particular, it is preferable that the second arm of the pressing means configured as described above is provided with an urging means for urging the second arm in the moving direction of the cable.

[0011] In such a cable aerial laying guide device, the rotational torque of the downstream pulley rotated by the belt cooperating with the cable can be controlled by the torque control means. Tension can be applied in the direction opposite to the extending direction. Further, since the cable to be extended is pinched by the gripping force obtained by being pressed by the belt by the roller of the pressing means, the cable moves with the belt without slipping.
This stabilizes the rotation of the belt, so that a constant tension can be applied to the cable to be extended.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a cable aerial laying guide device according to the present invention. The cable aerial laying guide device of the present invention is used for aerial cable laying work and the like. As shown in FIG. 5, the overhead wire laying work of the cable is performed by the existing wheels extending between the electric poles 1 and 1 and the wheels 3 and 3 ′ attached to the support wire 2, and the gold wires attached to the support wire 2. A cable feeding device 4 for pulling out a cable 6 inserted through the cars 3, 3 'from the cable drum 5, and a traction pulling a traction rope 8 connected to the cable 6 in order to insert the cable 6 into the wheel 3, 3'. A device 9 and a tow rope winding device 40 for winding the tow rope 8 pulled by the towing device 9 are used. A pulling roller is used for the wheel 3 'located on the cable feeding device 4 side, and a pulling roller is used for the wheel 3' located on the tow rope winding device 40 side.

The cable 6 pulled out by the cable feeding device 4 is guided in the extending direction by a cable aerial laying guide device 10 arranged on a rising portion A that raises the cable 6 from the ground. As shown in FIGS. 1 and 2, the cable aerial laying guide device 10 abuts on the inner diameter side of the cable 6 and cooperates with the cable 6, and abuts on the outer diameter side of the cable 6. Pressing means 12 for pressing the cable 6 against the belt 11 as the cable 6 moves, turn pulleys 13 and 14 and an intermediate pulley which rotate with the movement of the cable 6 around which the belt 11 is wound and pressed against the belt 11 by the pressing means 12 Fifteen
And torque control means 16 for controlling the rotational torque of the turn pulley 13 located on the downstream side to apply tension to the cable 6 guided by the belt 11 in the direction opposite to the extending direction.

The turn pulleys 13 and 14 and the intermediate pulley 15 are disposed on the frame 17 such that the belt 11 is provided with a curvature that is equal to or greater than the allowable bending radius of the cable 6. In addition, in order to apply an appropriate tension to the belt 11, a belt tighter 33 whose fixing position can be adjusted is provided on the frame 17. The pressing means 12 is located between a first arm 19 on both ends of which rollers 18a and 18b are rotatably supported, and the rollers 18a and 18b of the first arm 19, and the first arm 19 is rotatably held. And a second arm 20, 21 supported. Specifically, as shown in FIG.
An arm shaft bearing 22 having an arm shaft 23 axially mounted on a pin 0a is fixed thereto. A first arm 19 is rotatably supported by the arm shaft 23, and is inserted into a notch 21 c formed in a distal end portion 21 a of the other second arm 21 and fixed by a thumb screw 25.

The base ends 2 of the second arms 20 and 21
0b and 21b are the first as shown in FIGS. 1 and 2, respectively.
As the rollers 18a, 18b of the arm 19 move downstream, the distance between the belt 11 and the rollers 18a, 18b continuously decreases, and the belt 11 and the rollers The arm shaft 32 is rotatably supported at a predetermined position of the frame 17 such that the distance between 18a and 18b is equal to or less than the outer diameter of the cable 6.

The second arms 20 and 21 are provided with urging means 26 for urging the second arms 20 and 21 in the moving direction of the cable 6, respectively. Urging means 2
For example, a tension coil spring is used for the second arm 20. One end is located at a predetermined position of each of the second arms 20 and 21, and the other end is a frame 17.
Are fixed at predetermined positions. Further, an adjusting mechanism may be provided to adjust the tensile force of the tension coil spring 26.

As the torque control means 16, for example, a magnetic braking device for controlling the rotational torque of the turn pulley 13 located on the downstream side using a magnetic force is used. The magnetic braking device 16 is composed of two permanent magnets and a disk having a shaft fixed between the two permanent magnets, and the shaft is connected to the shaft of the turn pulley 13 (not shown). Thus, when the disk of the magnetic braking device 16 rotates, the countless lines of magnetic force between the two permanent magnets act so as to hinder the rotation of the disk, so that the rotational torque of the turn pulley 13 can be kept constant. The magnetic braking device 16 can adjust the torque according to the cable's own weight. Further, since a permanent magnet is used for the magnetic braking device 16, an external power supply is not required.

Further, a guide device 1 for laying a cable overhead.
An inlet guide 27 is fixed on the upstream side of the zero and an outlet guide 28 is fixed on the downstream side. The entrance guide 27 has a detachable structure, and includes a vertical roll 28 for guiding the cable 6 to travel in the center of the belt 11 and a cushion roll 29 for preventing the reversal when the cable 6 is a self-supporting cable. It has. The outlet guide 28 includes a pressing roller 30 that presses the cable 6 lightly so as to be adapted to the belt 11 provided with a curvature greater than the allowable bending radius of the cable 6. The pressing of the pressing roller 30 prevents the cable 6 and the belt 11 from slipping, so that the rotation of the belt 11 is stabilized and a predetermined torque can be obtained.

The work of laying the cable 6 using the cable aerial laying guide device 10 thus configured will be described. First, the hooks 31A and 31B provided on the cable aerial installation guide device 10 are hooked on a utility pole base 41 pre-installed on the utility pole 1 located at the rising portion A, thereby the cable aerial installation guide device 10 is hooked.
Is installed. Thus, the cable aerial laying guide device 10 is located at a height that can be reached without the laying worker climbing the ladder or the like. Further, since the cable aerial laying guide device 10 can be installed by being hooked on a telephone pole mount (not shown), it can be used regardless of the traction direction.

Next, the wheel 3 is attached to each predetermined position of the support wire 2, and the pulling rope 8 is inserted through each wheel 3. After the towing rope 8 is inserted into each wheel 3, one end of a connection fitting 7 is fixed to a tip of the towing rope 8 on the cable feeding device 4 side, and a cable drum is connected to the other end of the connection metal 7 by the cable feeding device 4. The tip of the cable 6 pulled out of the cable 5 is fixed. At this time, the cable 6 is connected to the belt 11 and the rollers 18a and 18b of the cable aerial installation guide device 10.
Let it be sandwiched between. Specifically, the arm shaft 23 of the cable aerial laying guide device 10 is connected to the second arm 20,
Loosen the thumb screw 25 fixed between the rollers 21 and
First arm 19 on which 8a and 18b are rotatably supported
Is released by rotating downwardly. And
The cable 6 pulled out from the cable drum 5 is passed through the vertical roll 28 and the cushion roll 29 of the entrance guide 27, and is passed along the belt 11 to the pressing roller 30 of the exit guide 28. After inserting the presser roller 30, the tip of the cable 6 is fixed to the other end of the connection fitting 7, and the opened first arm 19 is rotated and moved upward.
The cable 6 is held between the belt 11 and the rollers 18a and 18b.

In such a state, when the towing rope 8 is towed by the towing device 9, the cable 6 connected to the towing rope 8 via the connection fitting 7 is pulled out from the cable drum 5. At this time, the cable aerial laying guide device 10
Since the cable 6 moving along the belt 11 is always pressed by the belt 11 by the rollers 18a and 18b of the pressing means 12, the belt 11 rotates in synchronization with the movement of the cable 6. This is because each base end 20b, 21 of the second arm 20, 21 of the pressing means 12
b are the rollers 18a, 1 of the first arm 19, respectively.
As the belt 8b moves downstream, the distance between the belt 11 and each of the rollers 18a and 18b continuously decreases, and as the belt 8 approaches the downstream turn pulley 13, the distance between the belt 11 and each of the rollers 18a and 18b decreases. 6 is rotatably supported at a predetermined position on the frame 17 having an outer diameter equal to or less than the outer diameter of the cable 6, and the second arms 20, 21 are urged in the moving direction of the cable 6 by a tension coil spring 26 as urging means. It is. That is, the cable 6 is pinched by the gripping force obtained by reducing the distance between the belt 11 and each of the rollers 18a and 18b.

The downstream turn pulley 13 around which the belt 11 cooperating with the cable 6 is wound,
Since the rotational torque is controlled by the magnetic braking device 16 as a torque control means, a constant torque is applied regardless of the traction force of the traction device 9. As a result, tension is applied to the cable 6 in the direction opposite to the extending direction, so that even when the distance between the respective casters 3 is longer than before, it is possible to prevent the cable 6 being extended from hanging down by its own weight.

The biasing means may be provided inside the frame, and the type of spring is not limited to a tension coil spring.
A compression coil spring or a torsion coil spring may be used. In addition, the guide device for cable aerial laying of the present invention is not limited to a metal cable, and can guide an optical fiber cable without any trouble. Furthermore, in the embodiment of the present invention, the magnetic braking device is used for the torque control means. However, the present invention is not limited to this, and a powder clutch or the like may be used.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below. Using a 100-core overhead optical fiber cable (W = 0.35 kg / m), a cable installation operation using the cable overhead installation guide device of the present invention was compared with a conventional cable installation operation.

For example, as shown in FIG. 4, when the wire is to be drawn while maintaining the distance between the wheel and wheels at L = 20 m and the sag H = 1.5 m of the cable, the wire must be provided in a direction opposite to the drawing direction. The tension T (kgf) is obtained by the following equation.

[0026]

(Equation 1)

Here, W is the cable mass (kg / m). Therefore, the tension T that must be applied in the direction opposite to the extending direction is

[0028]

(Equation 2)

## EQU1 ## By applying such a tension T by a cable aerial laying guide device,
Even in the case where a wheel wheel which has been conventionally mounted at intervals of several meters is mounted at intervals of several tens of meters, it is possible to extend the wire while maintaining a predetermined sag H. Therefore, as shown in Table 1, when the cable laying length is 1 km, the total number of wheels attached can be reduced by 150 pieces.

[0030]

[Table 1]

Thus, assuming that the installation time of one wheel is 2 minutes, the total installation time of the wheel is 300 minutes (= 150 pieces × 2).
Minutes) can also be shortened.

[0032]

As described above, according to the guide apparatus for aerial cable laying of the present invention, the tension can be applied to the cable in the direction opposite to the extending direction of the cable on the cable feeding side. It is possible to prevent the cable in the wire from hanging down due to its own weight. As a result, the number of pulleys to be attached to the existing cables or support wires extending between the utility poles can be greatly reduced, so that the number of steps for attaching the wheel and wheels can be reduced. Therefore, efficiency and labor saving of the cable laying work can be achieved. Also, even during the cable laying work, the traffic of vehicles and passers-by on the ground is not obstructed.

[Brief description of the drawings]

FIG. 1 is a front view showing a guide device for laying a cable overhead according to the present invention.

FIG. 2 is a top view showing a guide device for laying a cable overhead according to the present invention.

FIG. 3 is a partial cross-sectional view showing a part of a pressing means of the cable aerial laying guide device of the present invention.

FIG. 4 is an explanatory diagram showing a laid state of a cable.

FIG. 5 is an explanatory view showing a state of a cable laying operation using the cable aerial laying guide device of the present invention.

FIG. 6 is an explanatory view showing a state of a conventional cable laying operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 6 ... Cable 10 ... Cable aerial laying guide device 11 ... Belt 13, 14 ... Turn pulley 15 ... Intermediate pulley 16 ... Magnetic braking device (torque control means) 18a, 18b ... Roller 19 ... First arm 20, 21 ... Second Arms 20a, 21a: distal end 20b, 21b: proximal end 26: tension coil spring (biasing means) A: rising part

Continued on the front page (72) Inventor Tsutomu Enari 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. (72) Inventor Kazuma Masaki 2-Ei Oda Ei, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture No. 1 No. 1 Inside Showa Electric Wire & Cable Co., Ltd. (56) References Japanese Utility Model Showa 54-48397 (JP, U)

Claims (4)

(57) [Claims] 1. A cable aerial laying guide device which is arranged on a rising portion of a cable to be erected from the ground and rises overhead from the ground, and guides the cable in an extending direction, the cable having a curvature greater than an allowable bending radius of the cable. A belt provided to abut on the inner diameter side of the cable and cooperate with the cable; pressing means abutting on the outer diameter side of the cable to press the cable against the belt as the cable moves; Controls the rotational torque of a plurality of pulleys that rotate with the movement of the cable pressed against the belt by the pressing means and at least one of the pulleys located at both ends of the plurality of pulleys. Torque control means for applying tension to the cable guided by the belt in a direction opposite to the extending direction. Cable aerial installation guide apparatus characterized by a. 2. The cable aerial installation guide device according to claim 1, wherein said torque control means is provided on said pulley downstream of said pulleys located at said both ends. 3. The pressing means is located between a first arm on both ends of which rollers are rotatably supported, and the roller of the first arm, and the first arm is rotatably provided at a tip end. A second end supported by the second arm, wherein the base end of the second arm has a continuous distance between the belt and each roller as each roller of the first arm moves downstream. And the distance between the belt and each of the rollers becomes smaller than or equal to the outer diameter of the cable as it approaches the pulley downstream of the pulleys located at both ends. The cable aerial installation guide device according to claim 1 or 2, wherein: 4. A guide device for laying an overhead cable according to claim 3, wherein said second arm is provided with an urging means for urging said second arm in a moving direction of said cable. .