JP2013212019A - Wiring method and removing method for low-voltage lead-in wire to electric power consumer, and leading-in tool used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety and operability of a wiring or removing operation for a low-voltage lead-in wire on a ladder.SOLUTION: There is provided a method of pulling up the other end of a work rope 7 having one end tied up to an end of a lead-in wire 3 by climbing a ladder up to a lead-in point place, winding the other end of the work rope 7 around a pulley 12 of a leading-in tool A at the place, locking the other end of the leading-in tool A to a rack 5 at the lead-in point in a swingable state, drawing and polling in the other end of the work rope 7, putting the work rope 7 and the lead-in wire 3 connecting with it close to the rack 5, and winding and anchoring the end of the lead-in wire 3 to the rack 5 in this state. The leading-in tool A includes a device which is provided with the cantilever type pulley 12 rotatably on a support plate 10 and restricts a movement of the work rope 7 wound around the pulley 12 to only a leading-in direction, and a swing cover 15 covering at least a part of the pulley 12 is pivoted on one side face of the support plate 10 to be freely opened and closed.

Description

The present invention relates to an overhead wire construction method for drawing a low-voltage lead-in wire from the nearest utility pole to a drawing-in point of a power consumer's house, a construction method for removing the lead-in wire, and a lead-in tool used for these construction methods.

Conventionally, in power distribution work, as shown in FIGS. 13 and 14, new and extended service lines 3 are installed from the nearest utility pole 1 to a service point 2 such as a house in order to provide electricity to each power consumer or change the capacity. Is going. The pull-in point 2 of the house or the like is often a rack 5 provided on a wall 4a of a house or the like 4 in the site of the electric power consumer. And the indoor line 6 of the house 4 etc. is connected to the edge part of the lead-in line 3 fastened with the said rack 5, it draws in into a house, and is connected to the switchboard (illustration omitted) etc.

The place where the lead-in line 3 is newly constructed and relocated is in a high position where human hands cannot reach, but it is not possible to use a work vehicle at a high altitude, and it is easy to get damaged in a narrow area where only one ladder can be put on the residential site. There are many restrictions on work such as walls of houses.

Conventionally, the lead-in operation is performed by building one end of the lead-in wire 3 and lifting the other end from the ground. Either the utility pole side or the residential side may be raised. However, when pulling in after branching between the utility poles so that the lead-in wire 3 does not cross over the other residential premises, the work procedure to lift the housing side so as not to damage the service entry point 2 It becomes.

As shown in FIG. 15, the pull-in work is performed by using work ropes to avoid obstacles in the air such as communication lines, and then, as shown in FIG. 16, as shown in FIG. 16, the worker goes up the ladder 8 leaning to the house drawing point 2 with the work rope 7, pulls up the work rope 7 on the ladder 8, and FIG. 17. As shown, the work rope 7 is wound around the rack 5 in the longitudinal direction around the rack 5 at the pull-in point 2 and temporarily fixed. Since the work rope 7 is slackened when it is wound around the rack 5, it is redone when the positions of the lead-in wire 3 and the rack 5 do not match.

In this state, as shown in FIG. 18, the end of the lead-in wire 3 is wound around the rack 5 and folded back, and a bind line or the like is wound around the folded-back end and secured, and as shown in FIG. After connecting to 6, the working rope 7 is removed.

Although not shown, the redrawing of the lead-in wire is tied to the existing lead-in wire when the working rope is removed, the tension of the lead-in wire is transferred to the working rope, and the lead-in wire is cut to remove it from the rack. Slowly drop the existing service line to the ground while loosening the work rope.

This series of work is limited to the above-mentioned restrictions, and the worker can only do it alone. If the balance on the ladder is lost, it will be difficult to correct the posture, and the tension applied to the operator's body will change depending on the angle at which the lead-in wire is pulled up. In addition, the work rope is wound around the rack at the pull-in point in the vertical direction to temporarily fix the work rope under the tension of the lead-in wire. Work. Until the work rope is temporarily secured, the work rope is under tension, so the hand it holds cannot be released. In addition, when the balance was lost, the work rope was loosened, the lead-in line fell down, and could hit a passerby.

Therefore, it is conceivable to pull the lead-in wire to the pull-in point using a tensioner as described in Patent Literature 1 and Patent Literature 2. In this case, since the lead-in wire is gripped by the camler (gripper) and the camler is drawn by the tensioning device, the labor of the operator who pulls the lead-in wire to the pull-in point is reduced.

Japanese Utility Model Publication No. 1-101775 JP 2006-130595 A

However, in general, the drawing wire has a small drawing width of about 80 cm, and the drawing width is insufficient to pull the drawing wire from the ground at the drawing point. In addition, after pulling up the lead-in wire with a tensioner, the work rope is tied to the end of the lead-in wire, the work rope is wrapped around the rack and temporarily fixed, and in this state, the lead-in wire must be turned around the rack and fastened. Work process increases. Therefore, the use of such a wire tensioner and the camler is not suitable for the lead-in wire overhead method.

Therefore, in view of these conventional techniques, the present invention provides an overhead wire construction method, a removal construction method, and an apparatus used for these construction methods, which can improve the safety and workability of a low-voltage lead-in wire overhead or removal work on a ladder. It is intended to do.

The invention of claim 1 is an overhead wire construction method for drawing a low-voltage lead-in line into a house or the like of an electric power consumer. The other end of the work rope, which is tied to one end of the lead-in line, climbs up to a pull-in point on a ladder, At the location, the other end of the working rope is wound around the pulley of the drawing tool, the other end of the drawing tool is swingably locked to the rack at the drawing point, and the other end of the working rope derived from the drawing tool The working rope and the following lead wire are brought close to the rack, and the end of the lead wire is wound around the rack in this state, and the pulling tool is attached to one side surface of the support plate. A hand-held pulley is rotatably provided and has a device for restricting movement of the work rope wound around the pulley only in the pull-in direction, and the sliding cover covering at least a part of the outer surface of the pulley can be freely opened and closed. It has a structure which is pivotally supported on one side of the support plate, and the overhead catenary method of drop cable.

Further, the invention of claim 2 is a method of removing a low-voltage lead wire drawn into a house or the like of an electric power consumer, in which one end of a work rope is tied to a lead wire fastened to a rack, and the other end is wound around a lead-in tool, The end of the pull-in tool is swingably locked to the rack, the end of the pull-in wire that has been held in the rack in this state is cut, and the other end of the work rope is sent out from the pull-in tool for work. A method of extending the rope and lowering the lead-in line to the ground, wherein the pull-in tool is provided with a cantilever pulley rotatably on one side of the support plate, and the work rope wound around the pulley is only in the pull-in direction. A device for restricting movement is provided, and means for releasing the restriction of movement of the device is provided, and a sliding cover covering at least a part of the outer side surface of the pulley is pivotally supported on one side surface of the support plate. Configuration and It was, was the removal method of the lead-in wire.

Further, the invention of claim 3 is a drawing tool used in the construction method of claim 1 or 2, wherein the other end of the working rope, one end of which is connected to the drawing line, is hung on a pulley, and is drawn by hand. A support plate that supports the rotating shaft of the pulley in a cantilever shape on one side surface, and a sliding pressure support that is pivotally supported on one side surface of the support plate so that the work rope can be pressed and fixed between the pulley and the pulley. And a sliding cover that is pivotally supported by the support plate so as to be separable to a position that covers at least a part of the outer surface of the pulley on the free end side of the rotating shaft. A retractable tool.

According to a fourth aspect of the present invention, there is provided a ratchet mechanism for restricting rotation only in a pulling direction of a work rope wound around the pulley, and a locking portion for locking a tool for rotating the pulley. Moreover, it was set as the retractable tool of Claim 3.

The invention of claim 5 is a drawing tool used in the construction method according to claim 1 or 2, wherein the other end of the working rope, one end of which is connected to the lead-in wire, is hung on a pulley and pulled by hand. A support plate that supports the rotation shaft of the pulley in a cantilever shape, a ratchet mechanism that restricts either direction of rotation of the pulley, and a shaft that is pivotally supported on one side surface of the support plate, And a pressure roller that is capable of pressure-fixing the working rope in between, and swinging on the support plate so as to be able to come into contact with a position that covers at least a part of the outer surface of the pulley on the free end side of the rotating shaft. It was set as the retractable tool provided with the sliding cover supported by the axis freely.

Further, the invention of claim 6 is provided with a guide pin supported in a cantilever shape on one side surface of the support plate with an interval in which the rope can be interposed from the pulley in parallel with the rotation shaft, The said sliding cover has a bearing part which can be engaged with the free end of the said rotating shaft, and a guide pin receiving part which can be engaged with the free end of the said guide pin. Retractable tool.

Further, in the invention of claim 7, at least the boundary position between the contact state and the separation state on the other end side of the working rope with respect to the pulley is covered by the sliding cover in the closed state. It was set as the drawing tool in any one of 6.

According to the invention of claim 1, the operator holds one end of the drawing tool in the rack in advance, goes up to the ladder with the working rope, opens the sliding cover of the drawing tool on the ladder, Hang the work rope on the pulley from the side, close the peristaltic cover, and pull the work rope. Even if the operator stops pulling the work rope at any point, the work rope is locked in that state. And is not sent in the opposite direction from the retracting tool. Therefore, it is easy to pull the work rope. Further, since the tension of the lead-in wire is received by the pull-in tool and is not received by the worker, it does not require a great effort that the worker cannot always release his / her hand. Further, unlike the prior art, there is no need to temporarily fix the working rope to the rack, and the drawn-in wire drawn can be held on the rack as it is. Therefore, the overhead wire work of the low-voltage lead-in line can be performed quickly and easily, the workability is good, and the safety is high.

According to the invention of claim 2, the operator locks one end of the retracting tool in advance in the rack, connects one end of the working rope to the retracting line, and, in the same manner as described above, other than the working rope. Hang the end on the pulling tool pulley, release the movement restriction of the device that restricts the movement of the work rope only in the pulling direction, the work rope can be easily sent out from the pulling tool, and the pulling wire is safely lowered to the ground I can do it. Therefore, the removal work of the low-voltage lead-in wire can be performed quickly and easily, the workability is good, and the safety is high.

According to the invention of claim 3, on the free end side of the rotating shaft of the pulley, the peristaltic sliding cover is close and covers at least a part of the outer surface of the pulley, and the peristaltic cover is separated from the pulley. Since two states can be taken, even when tension is generated in the work rope, it can be hung on the pulley from the middle of the work rope and removed. And in any state of the state which opened the peristaltic cover and the closed state, the working rope can be press-fixed by the peristaltic pressure contact piece. Thus, when the work rope is largely handled, the work rope can be temporarily detached from the tool, so that the work becomes easy and the work efficiency can be improved. Further, since the tip end of the cantilevered rotating shaft is fixed by the peristaltic cover, the overall rigidity is improved, the stress generated against the tension of the work rope is relaxed, and the durability is increased. If this lead-in tool is used, the safety | security of the lead wire overhead work and removal work will increase, and work efficiency will improve.

According to the invention of claim 4, when pulling the work rope with a pull-in tool and further pulling it by a small width, pulling the work rope by hand increases the pull-in width. Since the ratchet mechanism is provided, the pulling width can be finely adjusted by turning the pulley by hand or by a tool. Therefore, workability is further improved.

Further, according to the invention of claim 5, since the ratchet mechanism for restricting the bidirectional rotation of the pulley and the pressure contact roller capable of press-fixing the working rope between the pulley are provided, Whether the work rope is pulled in or when the work rope is pulled out in the removal work, the pulling-in or feeding speed can be slowed down, and the work is more reliable and safe.

According to the invention of claim 6, since the guide pin provided with a space in which the work rope can be interposed is disposed in the vicinity of the pulley, the work rope is prevented from falling off, and the work rope is moved to the pulley. It can be guided in good condition and operated stably. Further, since the peristaltic cover engages and is fixed to the free end of the guide pin, the rigidity is further increased. For this reason, the curvature of a support plate can be prevented and durability of a pulley can be improved.

According to the invention of claim 7, since at least the other end side region of the working rope that starts to be entangled in the pulley is covered with the sliding cover, the other end side is pulled by the lead-in wire. Can be prevented from being caught.

It is a schematic side view which shows the state before drawing in of the lead wire in the overhead wire construction method of Example 1 of this invention. It is a schematic side view which shows the drawing-in state of the lead-in wire in the overhead wire construction method of Example 1 of this invention. It is a schematic side view which shows the state which supported the lead-in line with the working rope and the drawing tool in the removal construction method of Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the drawing tool used for the overhead wire and removal method of Example 1 of this invention. It is a perspective view which shows the state which opened the peristaltic cover of the drawing tool used for the overhead wire and removal construction method of Example 1 of this invention. It is a side view which shows the pulley periphery of the drawing tool used for the overhead wire of the Example 1 of this invention, and a removal construction method. It is a side view of the state which opened the peristaltic cover of the drawing tool used for the overhead wire and removal construction method of Example 1 of this invention. It is a side view which shows the state which opened the peristaltic cover of the drawing tool used for the overhead wire of the Example 1 of this invention, and a removal construction method, canceled | released the press contact of the peristaltic pressure contact piece, and was locked. It is a side view which shows the locked state in the closed state of the peristaltic cover of the drawing tool used for the overhead wire and removal construction method of Example 1 of this invention. It is a principal part top view which shows the other example of the drawing tool used for the overhead wire of the Example 1 of this invention, and a removal construction method. It is explanatory drawing side view of the ratchet part which shows the other example of the drawing tool used for the overhead wire of the Example 1 of this invention, and a removal construction method. It is explanatory drawing side view of the ratchet part which shows the further another example of the drawing tool used for the overhead wire of the Example 1 of this invention, and a removal construction method. It is a side view of the lead-in line location which uses this invention. It is an enlarged principal part side view of the lead-in point location of the lead-in wire which uses this invention. It is a side view which shows the 1st process of the conventional overhead wire construction method. It is a side view which shows the 2nd process of the conventional overhead wire construction method. It is a principal part side view which shows the 3rd process of the conventional overhead wire construction method. It is a principal part side view which shows the 4th process of the conventional overhead wire construction method.

This invention is an overhead wire construction method for drawing a low-voltage lead-in line into a house or the like of an electric power consumer, and the other end of the work rope tied to one end to the end part of the lead-in line climbs up to the ladder to the pull-in point, and at that point, The other end of the working rope is wound around the pulley of the drawing tool, the other end of the drawing tool is swingably locked to the rack at the drawing point, and the other end of the working rope derived from the drawing tool is pulled. It is a construction method in which the hand rope, the work rope and the subsequent lead wire are brought close to the rack, and the end of the lead wire is wound around the rack in this state, and the pulling tool is attached to one side surface of the support plate. A pulley provided rotatably, and a device for restricting movement of a working rope wound around the pulley only in a pull-in direction, wherein the sliding cover covering at least a part of the outer surface of the pulley can be freely opened and closed. It has a structure which is axially supported on one side of the lifting plate, an overhead line method of drop cable.

Thereby, the safety | security and workability | operativity of the overhead wire or removal work of the low voltage | pressure lead-in line on a ladder can be aimed at.

Embodiment 1 of the present invention will be described below with reference to the drawings. First, the lead-in tool A used for the overhead wire and removal method of this invention is demonstrated.

FIG. 4 is a perspective view of the drawing tool A. FIG. The pull-in tool A has a pulley 12 rotatably attached around a rotating shaft 11 fixed in a cantilevered state from one side of a support plate 10. FIG. 4 shows a use state in which the work rope 7 is hung on the pulley 12.

On the other hand, a peristaltic pressure contact piece 13 is provided along with the pulley 12. This peristaltic pressure contact piece 13 is pivotally supported with respect to the support plate 10 so as to be capable of swinging. The peristaltic pressure contact piece 13 swings so as to be detachable from the pulley 12 from the lower side. Although a detailed configuration is not shown in FIG. 4, the peristaltic pressure contact piece 13 is provided with a biasing means (for example, a coil spring provided on a shaft to be supported) for biasing the pulley 12 side. A grip portion 13 a is formed on the side of the peristaltic pressure contact piece 13 facing the pulley 12. As a result, when the peristaltic pressure contact piece 13 is released in a state where the work rope 7 is hung on the pulley 12 and left to the urging means, the work rope is placed between the peristaltic pressure contact piece 13 and the pulley 12. It is pinched.

In this sandwiched state, the work rope 7 can be drawn toward the other end 7a below, but conversely, the grip 13a bites into the one end 7b connected to the lead-in wire 3, so that it cannot move. Become.

A guide pin 14 is fixed above the pulley 12 in a cantilevered state with respect to one side surface of the support plate 10, similarly to the rotating shaft 11. The guide pins 14 are provided so as to be spaced from each other so that the work rope 7 can be interposed between the guide pins 14 and the upper side of the pulley 12. Thereby, even if the arrangement posture of the drawing tool A changes with respect to the direction in which the one end 7b side of the working rope 7 in which the tension is generated extends, the working rope 7 is stably attached to the pulley 12 in a good state. It is possible to hold the state where the is applied.

Although not provided in the configuration of FIG. 4, the state where the peristaltic pressure contact piece 13 is separated from the pulley 12 can be locked and can be released after the work rope 7 is hung on the pulley 12. If a lock mechanism (described later) is provided, work efficiency is improved.

  Next, the operation of the drawing tool A will be described with reference to FIG. In FIG. 5, the state when the sliding cover 15 is opened in the drawing tool A of FIG. 4 is shown. The sliding cover 15 is pivotally supported with respect to one side surface of the support plate 10 so as to be swingable. Further, a handle 16 is provided on the free end side surface of the peristaltic cover 15, and the operator can open and close the peristaltic cover 15 with one hand by holding the handle 16.

As shown in FIG. 5, the swing cover 15 on the side of the pulley 12 pivots downward and opens the side of the pulley 12. Therefore, when the work rope 7 is extended and the ends of the electric wires and the like are drawn, The drawing tool A can be separated from the work rope 7. For this reason, it is not necessary to route the work rope 7 while rotating the pulley 12 to adjust the length. That is, when it is desired to largely handle the work rope 7, the work rope 7 can be detached from the retracting tool A, and the work efficiency is dramatically improved.

Since the sliding cover 15 engages and fixes the free end 11a of the rotating shaft 11 of the pulley 12 and the free end 14a of the guide pin 14 at the bearing portion 15a and the guide pin receiving portion 15b, respectively, a large tension is applied to the pulley. Even if it is added to 12, the rotating shaft 11 fixed in the shape of a cantilever is not drawn and the support plate 10 is not warped outward. Furthermore, it is possible to improve safety when the work rope 7 is drawn or extended. This will be described with reference to FIG.

FIG. 6 is a side view of the periphery of the pulley 12 of the pull-in tool A. The lower side surface of the pulley 12 is protected by the sliding cover 15. That is, a part of the pulley 12 is covered by the peristaltic cover 15 so that the working rope 7 cannot touch the gaps 17 and 18 which are boundary positions where the working rope 7 is separated from or in contact with the pulley 12. Yes. Thereby, it is possible to prevent the operator from being caught in the gap 17 when the work rope 7 is sent to the lead-in side. Similarly, it is possible to prevent the work rope 7 from being caught in the gap 18 when the work rope 7 is brought close to the hand.

In the above-described embodiment, a configuration in which a part of the lower side of the side surface of the pulley 12 is covered by the peristaltic cover 15 is shown, but at least the working rope 7 is brought into contact with the pulley 12 from the separated state. If the changed boundary position is protected, it is possible to prevent the operator from being caught in the hand. Moreover, in the said Example, although the structure in which the guide pin 14 was provided above the pulley 7 was shown, if it is a position which can prevent the fall of the working rope 7, it may not be above.

FIG. 7 shows a lock mechanism 19 that locks the open state of the peristaltic pressure contact piece 13. A locking mechanism 19 is provided on one side of the support plate 10, and a locking piece 21 having a knob 20 is slidably provided in the frame body 19 a, and is normally locked by a bias of a spring 22. 21 protrudes to one side of the frame body 19a and presses the peristaltic pressure contact piece 13.

When the locking groove 13b provided on the outer periphery of the peristaltic pressure contact piece 13 is rotated, the locking piece 21 of the locking mechanism 19 is moved into the locking groove 13b by the force of the spring 22, as shown in FIG. Inserted. Thereby, the peristaltic pressure contact piece 13 is configured to be locked and fixed at a position away from the pulley 12. In order to release the lock, if the knob 20 is pulled against the force of the spring 22, the locking piece 21 is disengaged from the locking groove 13b of the peristaltic pressure contact piece 13, and the peristaltic pressure contact piece 13 is attached to a coil spring or the like. With the force of the biasing means, it rotates clockwise in FIG. 8 and presses against the outer periphery of the pulley 12.

FIG. 9 shows a peristaltic cover locking mechanism 23 that locks the closed state of the peristaltic cover 15. The peristaltic cover locking mechanism 23 has substantially the same configuration as the locking mechanism 19, and a knob 24 is provided on the locking piece 25, and the locking piece 25 always goes to the left side in FIG. 9 by the force of the spring 26. It is biased and is fitted in a locking groove 27 provided in the sliding cover 15.

Therefore, when the knob 24 is pulled in the right direction in FIG. 9, the lock is released, and the locking piece 25 is released from the locking groove 27 of the sliding cover 15. In this state, the sliding cover 15 is counterclockwise in FIG. It can be opened by turning in the direction.

Next, a method for constructing a lead-in wire using the lead-in tool A will be described.

First, as shown in FIG. 1, one end of the retracting tool A is slidably locked via a rope 28 to a rack 5 provided on a wall 4 a of a house 4 of an electric power consumer. Then, as shown in FIGS. 15 and 16 of the conventional example, the other end of the working rope 7 having one end tied to the end of the lead-in wire 3 is lifted up to the ladder 8 up to two pull-in points, As shown in FIG. 4, the other end of the working rope 7 is wound around the pulley 12 of the retracting tool A.

For this, as shown in FIG. 5, the peristaltic cover 15 can be opened and the work rope 7 can be hung on the pulley 12 from the side. At this time, the peristaltic pressure contact piece 13 is pulled against the force of the urging means of the peristaltic pressure contact piece 13 and is separated from the pulley 12 and locked by the lock mechanism 19 as described above, and the work rope is connected to the pulley 12. Multiply 7. Thereafter, when the lock mechanism 19 is unlocked, the peristaltic pressure contact piece 13 presses the work rope 7 by the urging means. Then, the peristaltic cover 15 is closed. By closing the peristaltic cover 15 in this way, the peristaltic cover locking mechanism 23 is activated and the peristaltic cover 15 is locked in the closed state.

Then, as shown in FIG. 2, pulling the other end of the working rope 7 and pulling it closer, the working rope 7 and the subsequent lead-in wire 3 are brought close to the rack 5, and the distance between them is finely adjusted. In this state, the end of the lead-in wire 3 is wound around the rack 5 to make it. Thereafter, the work rope 7 is removed from the lead-in wire 3 and the lead-in tool A, and the lead-in tool A is removed from the rack 5. Thereby, the overhead wire work of the lead-in wire 3 is completed.

Further, in the method of removing the lead-in wire 3, in the state where the lead-in wire 3 is fastened to the rack 5, as shown in FIG. 3, one end of the lead-in tool A is slidably locked to the rack 5 via the rope 28. Then, one end of the work rope 7 is connected to the lead-in wire 3, the other end is hung on the pulley 12 of the lead-in tool A, and the tension of the lead-in wire 3 is left in the work rope 7. In this state, the end of the lead-in wire 3 is cut. After that, the peristaltic pressure contact piece 13 of the retracting tool A is rotated against the force of the urging means such as a coil spring, separated from the pulley 12, and this state is locked by the lock mechanism 19.

As a result, the work rope 7 and the pulley 12 become free, and the worker slowly sends out the work rope 7 from the pull-in tool A, and the pull-in line 3 is lowered to the ground. Thereafter, the working rope 7 is removed from the lead-in wire 3, the working rope 7 is pulled up and removed from the drawing tool A, and the drawing tool A is removed from the rack 5. In this way, the removal work of the lead-in wire 3 is completed.

Next, a drawing tool B which is a modification of the drawing tool A is shown in FIGS. This retracting tool B is provided with a ratchet mechanism 30 on one side of the pulley 12, and the pulley 12 and the rotating shaft 31 are integrated, and the rotating shaft 31 is cantilevered on one side of the support plate 10. Is rotatably supported by the shaft. In the ratchet mechanism 30, a ratchet gear 30 a is provided on the side surface of the pulley 12, and a ratchet claw 30 b is provided on the support plate 10.

A bolt head 32 is provided at the free end of the rotary shaft 31. The pulley 12 can be rotated only in the retracting direction of the working rope 7 by putting a tool on the bolt head 32. Therefore, after the operator pulls the work rope 7 by hand, the pulley 12 can be rotated by a tool or hand to pull the work rope 7 little by little. Therefore, the work rope 7 can be finely adjusted. Other configurations are the same as those of the retractable tool A.

FIG. 12 shows the retracting tool C, which is provided with a ratchet mechanism 30 similar to the retracting tool B, and always presses the pulley 12 instead of the peristaltic pressure contact piece 13 of the retracting tool A or B. A pressing roller 33 is provided.

In this case, the ratchet mechanism 30 can convert the ratchet pawl 30b in either direction, and the pulley 12 has a ratchet effect both in the clockwise direction and in the counterclockwise rotation. Further, the working rope 7 hung on the pulley 12 is pressed against the pulley 12 by the pressing roller 33, and rotational braking is applied.

Accordingly, the work rope 7 can be slowly drawn in or sent out when the lead-in wire is drawn in or removed.

These lead-in tools A, B and C are not limited to such overhead wire work and removal work, but can be widely used for pulling in and feeding out ropes when lifting equipment such as transformers. .

A, B, C Retraction tool
DESCRIPTION OF SYMBOLS 1 Telephone pole 2 Pull-in point 3 Lead-in line 4 House etc. 4a Wall 5 Rack 6 Indoor line 7 Work rope 7a Other end 7b One end 8 Ladder
DESCRIPTION OF SYMBOLS 10 Support plate 11 Rotating shaft 11a Free end 12 Pulley 13 Peristaltic pressure contact piece 13a Grip part 13b Locking groove 14 Guide pin
14a free end 15 swing cover 16 handle 17 clearance 18 clearance 19 lock mechanism 20 knob 21 locking piece 22 spring 23 swing cover locking mechanism 24 knob 25 locking piece 26 spring 27 locking groove 30 ratchet mechanism 30a ratchet gear 30b ratchet claw 31 Rotating shaft 32 Bolt head 33 Pressing roller

Claims (7)

  In the overhead wire construction method that draws the low-voltage service line into the house of the electric power consumer, etc., the other end of the work rope that is tied to the end of the service line is lifted up to the ladder to the service point, The other end of the retractable tool is wound around a pulley of the retractable tool, the other end of the retractable tool is swingably locked to the rack at the retracted point, and the other end of the work rope led out from the retractable tool is pulled to draw it by hand. This is a construction method in which the rope and the following lead wire are brought close to the rack, and the end of the lead wire is wound around the rack in this state, and the cantilever is freely rotated on one side of the support plate. The support plate is provided with a device for restricting movement of the working rope wound around the pulley only in the pull-in direction, and the sliding cover covering at least a part of the outer side surface of the pulley can be opened and closed. Characterized in that a structure in which pivoted to one side, the catenary method of low pressure drop cable to the power consumers.   In the method of removing the low-voltage lead wire drawn into the house of the power consumer, etc., one end of the working rope is tied to the lead wire fastened to the rack, the other end is wound around the lead tool, and the end of the lead tool swings Freely engage with the rack, cut the end of the lead-in wire that was held in the rack in this state, send the other end of the work rope from the lead-in tool, extend the work rope, and lower the lead-in wire to the ground In the construction method, the pull-in tool is provided with a cantilever pulley on one side of the support plate so as to be rotatable, and a device for restricting movement of the work rope wound around the pulley only in the pull-in direction. The apparatus has means for releasing the movement restriction of the apparatus, and has a structure in which a sliding cover covering at least a part of the outer side surface of the pulley is pivotally supported on one side surface of the support plate so as to be openable and closable. Electric Removal method of the low-pressure drop lines to consumers.   A working plate having one end connected to the lead-in wire is hooked on the other end of the work rope, and a support plate for supporting the rotating shaft of the pulley in a cantilever shape on one side, and one side of the support plate To a position where at least a part of the outer surface of the pulley is covered on the free end side of the rotating shaft. The retractable tool used in the construction method according to claim 1 or 2, further comprising a sliding cover pivotally supported on the support plate so as to be separable.   The ratchet mechanism for restricting the rotation only in the retracting direction of the working rope wound around the pulley is provided on the pulley, and a locking portion for locking a tool for rotating the pulley is provided. 3. The retractable tool according to 3.   The other end of the working rope, one end of which is connected to the lead-in wire, is hung on the pulley and brought close by hand, and a support plate that supports the rotating shaft of the pulley in a cantilever shape and either of the two directions of the pulley A ratchet mechanism that regulates rotation; a pressure roller that is pivotally supported on one side surface of the support plate and that can press-fix the work rope between the pulley and the outer end of the pulley on the free end side of the rotation shaft. The method according to claim 1, further comprising a sliding cover that is pivotally supported by the support plate so as to be able to be separated from and attached to a position covering at least a part of the side surface. Retractable tool used for   A guide pin supported in a cantilever shape on one side surface of the support plate at a distance allowing the rope to be interposed from the pulley in parallel with the rotation shaft, and the rotation shaft includes the rotation shaft. The retraction tool according to claim 3, further comprising a bearing portion engageable with a free end of the guide pin and a guide pin receiving portion engageable with the free end of the guide pin.   At least the boundary position between the contact state and the separation state on the other end side of the work rope with respect to the pulley is covered by the sliding cover in the closed state. The retractable tool described in 1.