JPH11122741A - Cable laying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the amount of a curved part from exceeding when drawing a straight part, by providing a stopper which is mounted on the opening of a duct and fixes a cable with a change in the curved amount of the cable. SOLUTION: A cable C passes through a drum 104, a sensor 105 and a roller guide 106 whose four faces are formed of a rotating body, and is curved at a curved part B. A stopper 1 is mounted at the opening of a duct 121 in a manhole 122, and is connected to a drive means and the sensor 105. As a result, when a curved amount S becomes large and reaches its allowable range outer curving amount of zero, a change in the curved amount A of the cable C is detected by the sensor 105 mounted at the curved part B to discriminate if it exceeds the allowable range. It is thus possible to prevent generation of damage caused by bending exceeding the allowable range of the cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying device which draws out a cable from a drum by a drive unit while bending the cable, inserts the cable into a duct such as an underground, and pulls the cable with a constant amount of bending by a towing machine. .

[0002]

2. Description of the Related Art Conventionally, a cable laying device for laying a cable underground is composed of a cable feeding device having a drive source and a drum and a traction machine arranged underground. In the cable laying operation based on the above configuration, the cable is drawn out from the drum, passed through a manhole, drawn underground, and sequentially passed through a towing machine to guide the cable to a predetermined position on the ground.

A cable laying apparatus when the above-mentioned cable is an optical fiber cable is disclosed in Japanese Patent Laid-Open No. 7-12355.
No. 6, JP-A-8-133592. As shown in FIG. 16, the configuration of the cable laying device 100 includes a drive source 102, a drive control unit 103, and a drum 10
4. Cable feeding device 101 including sensor 105
And a towing machine 113 installed in the duct 121 and the manhole 122 through which the cable C passes, and a towing rope winding device 110. In the cable laying operation based on the above configuration, the cable feeding device 101 is installed on the ground on the side where the cable C is inserted, and the cable C fed from the drum 104 by the driving source 102 passes through the sensor 105 provided at the entrance of the manhole 122. Let
It is inserted into the opening 121 of the opened duct 120. Due to its nature, the cable C and the tow rope connected to the tip of the cable C which is fed out from the drum 104 of the cable feeding device 101 with the fixed bending amount A between the opening 121 of the duct 120 and the fixed amount of bending A pass through the duct 121 and the manhole 122 passing therethrough. The cable is sequentially passed through a towing machine 113, and a towing rope connected to the end of the cable C is wound around a towing rope winding unit 112 installed on the ground, and is wound by using a drive source 111. At this time, the cable feeding device 101 is detected by the sensor 105 and controlled by the drive control unit 103 so that the feeding speed of the cable C becomes equal to the pulling speed. As a result, the tension of the cable C becomes substantially constant, so that the cable C can be laid so as to smoothly follow the traction of the traction machine 113.

However, this cable feeding device 1
In spite of the fact that the drum 104 of No. 01 is controlled by the drive control unit 103, the rotation speed may be reduced or the rotation may be stopped when an abnormality such as a drop in the power of the drive source 102 occurs. Also in this case, the cable C is continuously towed by the towing machine 113, and tension is generated. As a result, the bending amount A of the cable C is locally increased as the straight portion S is pulled out, and the cable C is bent at an acute angle. That is, as shown in FIG. 16, the bending portion B is in the state of the bending amount O outside the allowable range. In particular, in the case of the optical fiber cable, there is a problem in that the bent portion B is broken if the bent portion B is bent beyond a certain amount of bending A, such as the amount of bending O out of an allowable range, due to its properties. In addition, the cable C is not towed due to the synchronization,
There is also a problem that the same occurs when the wire is loosened.

[0005]

SUMMARY OF THE INVENTION The cable laying apparatus of the present invention relates to an improvement of Japanese Patent Application Laid-Open No. 8-133592 of the applicant in order to solve the above-mentioned problems. Installed to prevent the cable from bending beyond the allowable range due to the amount of bending of the curved part as the straight part of the duct is pulled out, and also to fix the cable when the cable laying equipment is abnormal and to prevent damage to the optical fiber cable It is an object of the present invention to provide a cable laying device that has been described above.

[0006]

According to a first aspect of the present invention, there is provided a cable laying device which is installed in an opening of a duct to fix a cable with a change in the amount of bending of the cable and to reduce the amount of bending. Even if there is no change, in the event of an abnormality on the payout side, there is a stopper for fixing the cable even before towing.

In this means, the cable is fixed by the stopper only when the amount of bending of the cable changes.

According to a second aspect of the present invention, the cable laying device sets an allowable range of the cable bending amount, and fixes the cable when a change in the cable bending amount exceeds the allowable range of the cable bending amount. It is in.

According to this method, the allowable range of the amount of bending of the cable is determined by an empirical rule, the type of the cable, and the like, and the timing for fixing the cable is specified.

The cable laying device according to a third aspect of the present invention is characterized in that the stopper is provided with a chuck which is constantly urged in a direction in which the stopper is tightened and a lock means for suppressing the urging of the chuck.

In this means, the cable is fixed by releasing the lock means of the chuck which is constantly urged.

A feature of the cable laying device according to the fourth aspect is that the locking means is remotely operated to be released.

In this means, it is visually confirmed that the drum has stopped or not synchronized or that the amount of bending has changed, and a controller attached to the stopper is operated to fix the cable.

A feature of the cable laying device according to the fifth aspect is that the lock means is released upon detecting a power source cut-off of the cable feeding device and other troubles that make the cable feeding device impossible.

In this means, the power source of the cable feeding device is cut off, and other troubles in which the cable cannot be fed out are detected by a sensor or the like, and the locking means is released to fix the cable.

A feature of the cable laying device according to the present invention is that the locking means is released when a sensor provided in the cable laying device detects that a change in the amount of bending of the cable exceeds an allowable range.

In this means, the sensor detects whether or not the change in the cable is within an allowable range, and when the change is exceeded, the cable is fixed.

A feature of the cable laying apparatus according to the present invention is that the locking means is released by an arm member attached so as to follow the cable.

In this means, it is determined that the arm member following the amount of bending of the cable has exceeded the allowable range of the cable, and the locking means is released to fix the cable.

A feature of the cable laying device according to the present invention is that the stopper is provided with a flange and has a pipe length which does not fall off when inserted into the opening of the duct.

With this means, the stopper need only be inserted into the opening of the duct. Further, since the flange is provided, the stopper is not drawn into the duct.

A feature of the cable laying device according to the ninth aspect is that the stopper has a cover that can be adjusted according to the size of the opening of the duct.

In this means, the position of the cover is adjusted in the radial direction according to the size of the opening of the duct, and the stopper is installed at the opening of the duct.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In the following description,
Components that are the same as those in FIG. 16 are given the same reference numerals, and descriptions thereof will be omitted. 1 to 4 show a configuration example of a cable laying device according to an embodiment of the present invention. As shown in FIG. 1, the cable laying apparatus 100 includes a driving source 102, a driving control unit 103, a drum 104, sensors 105 and 4,
A cable feeding device 101 having a roller guide 106 whose surface is formed of a rotating body, and a traction machine 11 installed in a duct 121 and a manhole 122 through which a cable C passes.
3 and a tow rope winding device 110. B is a curved portion, and C is a cable. Stopper 1
Is installed in the opening 121 of the duct 120 in the manhole 122 and is connected to the driving means (not shown) and the sensor 105.

The stopper 1 according to the present embodiment shown in FIGS. 5 to 11 includes a chuck 2 urged by the urging force of a spring 42 in a direction in which it is always tightened, and a lock means 3 for suppressing the urging of the chuck 2. ing. The chuck 2 has a substantially elongated shape as a whole and fixes the cable C.
And a substantially trapezoidal front half 5 having the locking means 3, a tubular rear half 8 inserted into the opening 121 of the duct 120, and a cover 9 detachably attachable to the rear half 8.

The chuck 2 is connected to the fixing piece 20 for fixing the cable C via a guide pin 26, and the chuck guide 21 moves the fixing piece 20 with the extension of the spring 42. And a handle 27 for guiding the movement of the user.

As shown in FIGS. 5 to 7, the fixing piece 20 has a wedge shape as a whole, and the angle of the oblique side 20a is formed at the same angle as the oblique side 5a of the front half 5 described later. Further, the cross-sectional shape is formed in a substantially concave shape in which the oblique side portion 20a is cut out, and a corner formed by the notch is chamfered. An upper surface 20b and a lower surface 20 are provided on an upper portion 7 of a first half 5 described later.
c is slidably abutted, and a pair of fixing surfaces 20d are installed facing each other. Note that a non-slip 24 made of rubber or the like may be attached to the fixing surface 20d. The portions other than the fixing surface 20d of the fixing piece 20 that comes into contact with the cable C are preferably precisely polished.

The chuck guide 21 has a substantially rectangular parallelepiped shape as a whole. Guide pins 26 are provided on the upper surface 21a.
Are formed in the direction orthogonal to the cable pulling direction. A fitting hole 22 into which the handle shaft 37 is fitted is formed in the center of the side surface 21b. An engaging portion 25 is provided at one of the left and right ends of the side surface 21b. A female screw hole 23 for adjusting the position of the handle shaft 28 is provided at the center of the upper surface 21a. The width of the guide pin groove 22 in the lateral direction is desirably substantially the same as or greater than the amount of lateral movement of the guide groove 61.

The handle 27 has an elliptical ring shape, and a handle shaft 28 is connected to the center. The handle shaft 28 is inserted into a bearing 70 fixed at the center of the upper wall 71 of the lower part 7 and is slidable with respect to the bearing. A spring 42 is inserted through the handle shaft 28 so that the handle shaft 28 is fitted into the fitting hole 24 formed in the chuck guide side surface 21b, and the tip of the handle shaft 28 is caulked with a wheel stopper 43 or the like so as not to come off. I have. Thus, the chuck guide 21 is always urged, and the extension direction of the spring 42 is specified.

The locking means 3 is provided with a lever 30 having an engaging piece 31 which engages with the engaging portion 25 of the chuck guide 21 to suppress the bias, a bracket 32 which supports the lever 30, and a position where the lever 30 is displaced. It comprises a release unit 4 for releasing the engagement by releasing the engagement of the engagement piece 31.

The lever 30 has a substantially L-shape as a whole in consideration of a mounting space. Except for the bent portion 30a bent in an L shape, the structure is such that the thickness is reduced and the center of gravity is formed as the bent portion 30a. The lever 30 is rotatably supported at a substantially center thereof via a support shaft 33 inserted through a bracket 32 described later. Further, the tip of the lever 30 is formed in a notch shape, and a hooking piece 31 described later can be attached to the side surface via a pin 34. Further, the lever 30 is formed so as to be substantially horizontal when the engagement shaft 41 of the release unit 4 described later and the bent portion 30a are engaged.

The engaging piece 31 is provided at the engaging portion 2 of the chuck guide.
7 is formed in a substantially claw shape which can be hooked. The lever 3
0 is rotatably supported by a pin 34 via a pin 34. The engaging piece 31 is engaged with the engaging portion 27 of the chuck guide 26, and normally plays a role of suppressing the urging of the chuck guide 26. Preferably, the engagement piece 31 is pivotally supported by urging with a spring or the like in order to increase the reliability of the engagement release.

The bracket 32 has a substantially U-shaped cross section, and has a width large enough to hold the lever 30 therebetween. The bottom surface is attached to the lower part 7 of the front half part 5. The bracket 32 is connected to the lever 30 via the support shaft 33.
Can be rotatably supported.

The release unit 4 includes a solenoid 40 and a lever 30
And an engaging shaft 41 engaged with the bent portion 30a of the second member. When the power is turned on and off, the solenoid 40 changes the magnetic force to release the engagement. Normally, the bent portion 30a of the lever 30 and the engaging shaft 41 are engaged by the magnetic force of the solenoid 40, the lever 30 is held horizontally, the engaging piece 31 and the engaging portion 27 are engaged, and the urging of the chuck 2 is performed. I am holding it down. Note that the release section 4 is not limited to the present embodiment, and the mechanism can be appropriately changed within a range satisfying the above functions.

The front half 5 having the above-described structure has a substantially trapezoidal shape as a whole, and is formed in a shape in which a part of a substantially trapezoidal tube having a square cross section is cut away. Then, a lower part 7 having a rectangular member attached thereto is inserted into a tubular half part 5 of the same shape having a thickness of about half and the front half part 5 is divided into an upper part 6 and a lower part 7 to form a two-layer structure. A pair of fitting members 64 having horizontally long holes 65 connected to the front half 2 are provided at the front end of the front half 5, and a fixing pin is provided in each of the long holes 89 and 65. 66 can be inserted and coupled to the latter half 8 described later.

The upper part 6 is capable of storing the fixing piece 20. Further, it is a guide surface 60 for the fixing piece 20 and the cable C. Further, two guide grooves 61 for guiding the chuck 2 at the same angle as the oblique side 5a of the front half 5 are formed. The inner peripheral surfaces of the guide surface 60 and the guide groove 61 may be precisely polished to reduce frictional resistance.

The lower part 7 is provided with a guard 73 so as not to damage other parts when the bent part 30a of the lever 30 is lowered with the release of the locking means.

The rear half portion 8 is formed in a substantially tubular shape having a cutout portion 80 in which a part of an inner peripheral surface 81 and an outer peripheral surface 82 into which the cable C can be inserted is cut out. Pipe length L of the latter half 8
Is a pipe length L at which the stopper 1 does not fall out when inserted into the opening 121 of the duct 120. The width of the notch 80 is set to be equal to or larger than the diameter of the cable C. Further, a semicircular flange 83 having a diameter larger than the diameter of the outer peripheral surface 82 is provided at the rear end of the rear half 8. Further, a support 84 having an L-shaped plate attached to a disk having the same diameter as the flange 83 is provided at the end of the rear half 8. And Tsuba 8
3 and the support 84 are connected by a rib 85 along the notch 80. A connecting member 86 protruding in the horizontal direction is provided between the flange 83 and the support 84 so as to be connectable to the cover 9 having a through hole 87 described later. Further, a pair of fitting members 88 that can be fitted to the front half 5 having an elongated hole 89 penetrating in the horizontal direction are provided at the end of the support tool.

The cover 9 has a semi-circular tubular shape, and is formed so that the outer peripheral surface 82 of the rear half 5 and the inner peripheral surface 91 of the cover 9 can contact each other. The pipe length L is set to be substantially the same as the length of the first half 8. A semicircular flange 90 is provided at a position on the same plane when brought into contact with the flange 83 of the rear half portion 8. Further, a coupling portion 92 having a through hole 93 projecting in the horizontal direction is provided at the rear end of the cover 9. The rear half 8 can be attached and detached by a fixing bolt 94 and a nut 96 with an adjusting nut 95 interposed between the fitting member 88 and the adjusting nut 95. Also, as shown in FIGS. 10 and 11, by adjusting the adjustment nut 95, the position of the cover 9 can be moved in the vertical direction to change the outer diameter d from D to D in accordance with the opening 121 of the duct 120. It is possible.

The operation based on the above configuration will be described with reference to FIGS. For example, when laying the cable C in the duct 120, first, the cable feeding device 1
01, the cable C fed out of the bending portion B with a constant bending amount A by the drive control portion 103 is passed through the roller guide 106, and is passed through the front half 5 and the rear half 8 of the stopper 1 to sequentially pass through the manhole 122. The tow rope connected to the end of the cable C sequentially passed through the tow machine 113 installed therein is taken up by the tow rope winding unit 112 installed on the ground. However, when the drum 104 of the cable feeding device 101 is in an abnormal state such as a decrease in the power of the drive source 102, the rotation speed may decrease or the rotation may stop. However, cable C is the towing machine 1
The tension continues to be caused by the traction by the thirteen.
Along with this, the bending amount A of the cable C increases.

The bending amount A becomes large, and the bending amount O out of the allowable range is obtained.
Then, a change in the bending amount A of the cable C is detected by the sensor 105 provided in the bending portion B, it is determined whether or not the allowable range is exceeded, and a signal is input to the release portion 4. First, the power supply of the solenoid 40 is turned off, the magnetic force is cut off, and the engagement between the engagement shaft 41 and the bent portion 30a is released. Next, the bent portion 30a descends with the support shaft 33 of the bracket 32 as a fulcrum. Therefore, the engagement piece 31 engaged with the engagement portion of the chuck guide 21 is rotated and removed with the pivotally supported pin 34 as a fulcrum. Then, the chuck guide 21 urged by the spring 42 is pushed out in the cable pulling direction. Along with this, the pair of fixing pieces 20 connected via the guide pins 26 are urged to slide on the guide surface 60 in the same direction as the chuck guide 21 and translate. And
When the interval between the fixing surfaces 20d of the chuck 2 becomes smaller than the diameter of the cable C, the cable C is fixed. At this time, the position of the chuck 2 is held by the urging force of the spring 42.

Also, during the cable laying work, when an abnormality such as a drop in the power supply occurs, the number of rotations may be reduced, the rotation may be stopped, or the cable C may not be pulled in synchronization with the towing machine 113. When a trouble occurs, even if the cable C does not have the out-of-tolerance bending amount O, it is detected by the sensor 105 or the like installed in the cable laying device 100 and the locking means 3 is released to fix the cable C. Also, even before the cable C is pulled by the towing machine 113, in the event of an abnormality such as the cable C being not fed out on the cable feeding device 101 side, even if the cable C does not have the out-of-tolerance bending amount O, the locking means 3 Is released, and the cable C is fixed.

In the above-described example, the cable C can be securely fixed because the anti-slip 24 made of rubber or the like is attached to the chuck 2. In addition, the impact force applied to the cable C when the stopper 1 is actuated is reduced by the fixing piece 20 that has a good impact absorption characteristic of rubber or the like, has a large area, and is installed so as to fix the cable C substantially in parallel. be able to. Further, the above and the fixing force can be adjusted by selecting the material of the non-slip 24. The form of the chuck 2 and the urging of the chuck 2 are not limited to these. In the present embodiment, the spring 42 is used for the urging of the chuck 2, but the urging is not limited to the spring 42, and the urging can be appropriately changed as long as the above function is satisfied.

Further, in the above-described example, since the guide surface 60 and the fixing piece 20 are precisely polished and the cross-sectional shape of the fixing piece 20 is formed in a shape having little friction, the cable laying operation can be performed smoothly. I can do it. Also,
When the cable C is fixed, the movement of the fixing piece 20 can be made smooth.

In the above example, the amount of translation of the fixed piece 20, that is, the stroke of the fixed piece 20 can be adjusted by adjusting the position of the chuck guide 21. Therefore, even when the diameter of the cable C is different, the optimum stroke can always be set.

Then, in the above example, the engaging piece 31
Is locked by the spring or the like, and when the locking means 3 is released when the cable C is fixed, the locking piece 31 is released and the engaging piece 31 comes off.

The bending amount O outside the allowable range of the bending amount A when the cable C is laid differs depending on the material and diameter of the cable C. Therefore, it is desirable that the out-of-tolerance bending amount O for each cable C is determined in advance by an empirical rule, an experiment, or the like. Further, in this embodiment, it is possible to adjust the stroke and adjust the timing of the lock means 3 in accordance with the stroke.

Further, in the above example, the stopper 1
The installation is completed only by inserting the rear half 8 into the opening 121 of the duct 120. In addition, since the rear portion 8 is provided with the cutout portion 80 having a width equal to or larger than the diameter of the cable C, it is possible to insert the cable C even if it is already installed.
Further, since the flange 83 is provided, it is possible to prevent the stopper 1 from being retracted when the cable C is fixed, and to withstand the impact when the cable C is retracted. When the stopper 1 is installed, the flange prevents the stopper 1 from being bent by its own weight near the opening 121. Further, the support member 84 provided on the rear half portion 8 transmits the own weight of the front half portion 5 to the rear half portion 8 and disperses it, thereby reducing the load on the coupling pin 66.

Two examples of the embodiment will be described with reference to FIG. In the following description, the same components as those of the embodiment will be denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 14, the controller 7 connected to the stopper 1 via the cord K in two examples.
The configuration is the same as that of the example of the embodiment except that 2 is installed. The controller 72 is capable of releasing the engagement between the engagement shaft 41 of the release section 4 and the bent section 30a by operating. After visually confirming that the cable C has a bending amount O outside the allowable range of the bending amount A when the cable is laid, or that the drum 104 has stopped and is not synchronized, the controller 72 is operated to engage. Axis 4
1 and the bent portion 30a are released to fix the cable C. In the present embodiment, the controller 7
2 is connected by a cord K, but it is not always necessary, and it may be cordless.

Three examples of the embodiment will be described with reference to FIG. As shown in FIG. 15, in the four examples, the arm member 67 that follows the cable C is installed on the guide surface 60 of the lower part 7 of the front half part 5 of the stopper 1 according to the example of the embodiment. It has the same configuration. Arm member 6
7 is set so as to act on the release unit 4 and release the lock unit 3 when the change in the amount of bending A reaches the out-of-tolerance amount of bending O following the change in the amount of bending A of the cable C in advance. Have been. In FIG. 15, when the change in the bending amount A of the cable C reaches the bending amount O outside the allowable range, the magnetic force of the solenoid 40 is cut off, and the engagement between the bent portion 30a of the lever 30 and the engagement shaft 41 is released. The cable is fixed. Note that the form of the arm member 67 is not limited to the present embodiment, and can be appropriately changed within a range satisfying the above functions.

[0051]

According to the cable laying device of the present invention, the stopper is provided at the opening of the duct and the stopper is provided to fix the cable in accordance with the change in the amount of bending of the cable. Damage can be prevented.

According to a second aspect, since the cable is fixed by setting an allowable range of the amount of bending of the cable, the timing is specified. Further, since the allowable range of the bending amount is set, the stopper operates regardless of whether the change in the bending amount increases or decreases, and the cable can be fixed.

According to a third aspect of the present invention, the chuck is constantly urged in the tightening direction, and the urging is released by the lock means, so that the cable can be securely fixed.

According to the fourth aspect, since the remote control can be performed, it is not necessary to arrange personnel in a manhole or the like where the stopper is installed, and the cable laying operation can be performed safely. In addition, labor can be saved.

According to a fifth aspect of the present invention, the locking means is released upon detecting a power source disconnection of the cable feeding device and other troubles in which the cable cannot be fed out, so that the locking means is not limited to when the cable is laid, and the cable performance is not affected. Can be fixed. Therefore, when an abnormality occurs, damage to the cable can be prevented.

According to a sixth aspect of the present invention, it is possible to automate the fixing of the cable by providing a sensor in the cable laying device and interlocking with the release portion of the lock means.

According to a seventh aspect of the present invention, a cable laying device can be simplified by providing a member for releasing the locking means in the stopper.

According to an eighth aspect of the present invention, the stopper is set to have a pipe length which does not fall off when inserted into the opening of the duct. Therefore, it can be installed simply by inserting it into the opening of the duct. Further, since the collar is provided, the cable is not drawn into the duct when the cable is drawn.

According to a ninth aspect, by attaching a cover, the diameter can be adjusted in accordance with the size of the opening of the duct. Therefore, the number of parts can be reduced. Further, since the rear half is detachable, it can be changed according to the shape of the opening of the duct.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a cable laying device according to the present invention.

FIG. 2 is a schematic diagram showing an example of an embodiment of a cable laying device according to the present invention.

FIG. 3 is an enlarged view of a main part of FIG. 1 according to the present invention.

FIG. 4 is an enlarged view of a main part of FIG. 1 according to the present invention.

FIG. 5 is a perspective view of the stopper of FIG. 1 according to the present invention.

FIG. 6 is an exploded perspective view of the stopper of FIG. 1 according to the present invention.

FIG. 7 is a perspective view of a main part of a stopper in FIG. 1 according to the present invention.

FIG. 8 is a top view before fixing the cable in FIG. 1 according to the present invention.

FIG. 9 is a side cross-sectional view before fixing a cable in FIG. 1 according to the present invention.

FIG. 10 is a top view when the cable is fixed in FIG. 1 according to the present invention.

FIG. 11 is a side sectional view showing a state in which the cable is fixed in FIG. 1 according to the present invention.

FIG. 12 is a sectional view taken along line EE in FIG. 8 according to the present invention.

FIG. 13 is a cross-sectional view taken along the line EE when adjusted according to the opening of the duct in FIG. 8 according to the present invention.

FIG. 14 is a schematic diagram showing two examples of an embodiment according to the present invention.

FIG. 15 is a schematic diagram showing three examples of an embodiment according to the present invention.

FIG. 16 is a schematic view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stopper 2 Chuck 3 Locking means 4 Release part 9 Cover 31 Engagement piece 42 Spring 67 Arm member 83 Flange A Bending amount B Bending part C Cable K code L Pipe length O Outside allowable range bending amount

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takahiro Asaga 3--18-14 Takada, Toshima-ku, Tokyo Inside the Hakusan Plant (72) Inventor Masayuki Kikuchi 3-18-14 Takada 3-chome, Toshima-ku, Tokyo Company Hakusan Works (72) Inventor Kazuhiko Suzuki 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Koichi Goto 3-2-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (72) Masao Terasawa, Inventor 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (72) Inventor Kenichiro Arakawa 2-3-9, Higashi-Shimbashi, Minato-ku, Tokyo Stock Within Todentsu, Inc. (72) Inventor Kiyoshi Matsuyama 2-39, Higashi-Shimbashi, Minato-ku, Tokyo Co., Ltd. Within Todentsu, Inc. (72) Hiroshi Otani 2-9-1, Higashi-Shimbashi, Minato-ku, Tokyo No. Todentsu Co., Ltd.

Claims (9)

[Claims] 1. A cable laying device, wherein a cable is drawn out from a drum while being bent by a driving unit, inserted into a duct such as an underground, and the cable is pulled by a pulling machine with a fixed bending amount. A cable laying device having a stopper that is installed and fixes the cable in accordance with a change in the amount of bending of the cable. 2. The cable laying apparatus according to claim 1, wherein an allowable range of the amount of bending of the cable is set, and the cable is fixed when a change in the amount of bending of the cable exceeds the allowable range. Installation equipment. 3. The cable laying apparatus according to claim 1, wherein the stopper is provided with a chuck which is constantly urged in a direction in which the stopper is tightened, and a lock means which suppresses the urging of the chuck. Installation equipment. 4. The cable laying apparatus according to claim 1, wherein the lock means is released by being remotely operated. 5. The cable laying device according to claim 1, wherein the locking means is configured to cut off a power source of the cable feeding device,
A cable laying device characterized in that the cable laying device is released upon detection of other troubles that cannot be extended. 6. The cable laying device according to claim 1, wherein the lock means is released when a sensor provided in the cable laying device detects that a change in the amount of bending of the cable exceeds an allowable range. A cable laying device, characterized in that: 7. The cable laying apparatus according to claim 1, wherein the lock means is released by an arm member attached so as to follow a change in the amount of bending of the cable. Installation equipment. 8. The cable laying device according to claim 1, wherein the stopper has a pipe length that does not fall off when inserted into the opening of the duct, and a flange is provided so as not to be drawn into the opening of the duct. Characteristic cable laying device. 9. The cable laying device according to claim 1, wherein the stopper has a cover that can be adjusted in a radial direction according to the size of the opening of the duct.