JP5770227B2 - Advanced tools for indirect hot-wire construction - Google Patents

Description

  The present invention relates to a tip tool for indirect hot wire construction. In particular, the present invention relates to a tip tool provided at the tip of an indirect hot wire tool such as an insulating operation rod, and a tip tool for indirect hot wire work for cutting a high-voltage distribution line or the like installed on a utility pole.

  There are two types of hot-line work that performs high-voltage distribution lines without power interruption: direct hot-wire method and indirect hot-wire method. In the direct hot wire construction method, workers wear protective equipment such as high-pressure rubber gloves and perform power distribution work by directly touching the high-voltage distribution line that is energized. On the other hand, the indirect hot wire method allows the operator to perform power distribution work without directly touching the high-voltage power distribution line that is energized using an insulating operation rod (hot stick) or the like.

  In general, an insulating operation rod is composed of a long operation rod and a power distribution work tool (hereinafter referred to as a tip tool) attached to the tip of the operation rod. And the insulation operating rod is comprised so that a front-end tool can be replaced | exchanged according to the work objectives, such as holding | griping or cutting | disconnecting a high voltage distribution line.

  As an indirect hot wire cutting tool (so-called cable cutter) that cuts high-voltage distribution lines, etc., the fixed blade with the first blade formed at the end and the second blade close to the first blade Alternatively, the second blade portion is formed at the end portion so as to be separated, and the movable blade is rotatably connected to the fixed blade, and a fan-shaped gear is formed on the outer peripheral edge of the movable blade and meshed with the fan-shaped gear. A cable cutter is disclosed in which a gear is rotated by a power transmission mechanism provided on an insulating operation rod to cut a high-voltage distribution line between a first blade portion and a second blade portion (see, for example, Patent Document 1). ).

JP 2002-160119 A

  6A and 6B are diagrams showing the configuration of a cable cutter according to the prior art. FIG. 6A is a front view of the cable cutter, and FIG. 6B is a left side view of FIG. FIG. 7 is a schematic view showing an example of using a cable cutter according to the prior art. 6 of the present application corresponds to FIG. 1 of Patent Document 1, and FIG. 7 of the present application corresponds to FIG. 3 of Patent Document 1.

  Referring to FIG. 6, the cable cutter 9 according to the prior art includes a cylindrical fitting 91 and a gear box 92. The cable cutter 9 includes a strip-shaped fixed blade 93 and a semi-disc-shaped movable blade 94. The gear box 92 is fixed to the upper part of the joint fitting 91. The fixed blade 93 is fixed to one side surface of the gear box 92. The movable blade 94 is rotatably connected to a rotation shaft 93 s provided on the fixed blade 93.

  Referring to FIG. 6, the joint fitting 91 has a drive shaft 95 rotatably held at the center thereof. The drive shaft 95 has a connecting fitting 95a that can be connected to a power transmission mechanism (not shown) provided on the insulating operation rod 80 (see FIG. 7) fixed to the lower end portion. The drive shaft 95 has a bent bevel gear 96a having a small number of teeth fixed to the upper end. The bent bevel gear 96a is disposed so as to protrude into the gear box 92.

  Referring to FIG. 6, the cable cutter 9 includes a rotating shaft 97 that is supported at both ends by one side wall of the gear box 92 and the fixed blade 93. The rotating shaft 97 has a bent bevel gear 96b having a large number of teeth meshing with the bent bevel gear 96a fixed thereto. The bent bevel gear 96 b is disposed inside the gear box 92. The rotating shaft 97 has a spur gear 98 fixed to the end. The spur gear 98 is disposed so as to protrude to the fixed blade 93 side.

  Referring to FIG. 6, the fixed blade 93 has a first blade portion 93a formed at the end. On the other hand, the movable blade 94 has a second blade portion 94a facing the first blade portion 93a at the end. The movable blade 94 has a sector gear 94b formed on the outer peripheral edge thereof. The sector gear 94 b meshes with the spur gear 98.

  Referring to FIG. 6, when the spur gear 98 is rotated in one direction, the movable blade 94 can be rotated in one direction so that the second blade portion 94a is close to the first blade portion 93a. And it can cut | disconnect on both sides of the electric wire W with the 1st blade part 93a and the 2nd blade part 94a (refer FIG. 7). On the other hand, when the spur gear 98 is rotated in the other direction, the movable blade 94 can be rotated in the other direction so that the second blade portion 94a is separated from the first blade portion 93a.

  Referring to FIG. 7, when cutting the high-level electric wire W installed on the utility pole P, the worker M gets on the work table B provided on the high-altitude work vehicle C and attaches the cable cutter to the tip. The operation is performed by operating the insulating operation rod 80 connected to 9.

  Referring to FIG. 7, a power transmission mechanism (not shown) is disposed inside the insulating operation rod 80. When the handle 81 provided on the handle portion of the insulating operation rod 80 is rotated in one direction, this movement is transmitted to the joint fitting 91 via the power transmission mechanism, and the first blade portion 93a and the second blade portion 94a. It can be cut across the electric wire W (see FIG. 6).

  However, the cable cutter according to the prior art has a problem that it is configured to operate by being connected only to an insulating operation rod having a complicated power transmission mechanism. If a simple tool bar that can be used to connect tip tools with different applications to the tip part can be used to create a tool for hot-wire construction that cuts wires, the existing tool bar can be used. It is convenient because the tip tool can be changed. The above can be said to be the subject of the present invention.

  This invention is made | formed in view of such a subject, and provides the tip tool for tangential wire construction which cuts an electric wire using the common operation stick | rod which can connect the tip tool from which a use differs to a front-end | tip part. For the purpose.

  The inventor has a cylindrical connecting fitting that can be connected to the tip of the common operation rod at the lower end, and is provided with a rotating cylindrical body having a feed female screw portion formed on the inner wall, and a feed screwed into the feed female screw portion. A male threaded portion is formed on the outer periphery, a moving cylindrical body that moves in the axial direction with respect to the rotating cylindrical body, and a base end portion that is pivotally connected to the upper portion of the moving cylindrical body, and cutting blades that face each other intersect or A pair of curved blades that open and close so as to be separated from each other, a biasing member that biases force in a direction in which the pair of curved blades open, and an outer periphery of the rotating cylindrical body are surrounded and rotatably connected about the axis of the rotating cylindrical body In addition, an encircling cylinder whose axial movement is restricted with respect to the rotating cylinder constitutes a leading tool for tangential wire construction, and the common operating rod is rotated in one direction to move the moving cylinder. By raising, a pair of curved blades are opened, and a pair of notches at the upper edge of the surrounding cylindrical body An electric wire is introduced from the outer circumferential direction between one groove and a pair of curved blades, the common operation rod is rotated in the other direction, the moving cylindrical body is lowered, and the outer circumference of the pair of curved blades is the inner wall of the rotating cylindrical body It has been found that the electric wire can be cut by abutting and closing, and on the basis of this, the following new tip tool for indirect hot wire construction has been invented.

  (1) A tip tool for indirect hot-wire construction according to the present invention is a tip tool for indirect hot-wire construction capable of cutting an electric wire using an insulating operation rod that can share a tip tool having different uses, and the insulation operation A cylindrical connection fitting to which the tip of the rod can be connected is formed at the lower end, a rotating cylindrical body having a feed female screw portion formed on the inner wall, and a feed male screw portion screwed into the feed female screw portion are formed on the outer periphery, A movable cylindrical body that moves in the axial direction with respect to the rotating cylindrical body and a base end portion that is pivotably connected to an upper portion of the movable cylindrical body, and are opened and closed so that cutting blade portions that face each other intersect or separate. A pair of curved blades, a biasing member that biases the force in the opening direction of the pair of curved blades, and an outer periphery of the rotating cylindrical body so that the rotating cylindrical body is rotatable about its axis. A package that connects and restricts axial movement relative to the rotating cylindrical body A cylindrical body, and the surrounding cylindrical body is substantially orthogonal to a direction in which the pair of cutting blades extends and the pair of first grooves cut out from the upper edge so that the electric wire can be introduced from the outer peripheral direction. A pair of second grooves that are notched from the upper edge so as to be substantially orthogonal to the pair of first grooves and that regulate the position of the pair of curved blades, By rotating the operating rod in one direction around the axis and raising the movable cylindrical body, the pair of curved blades are opened, and the electric wire is introduced from the outer peripheral direction between the pair of curved blades, The insulating operation rod can be rotated around the axis in the other direction to lower the movable cylindrical body, and the outer circumferences of the pair of curved blades can be brought into contact with the inner walls of the rotating cylindrical body and closed.

  (2) The moving cylindrical body may be made of an insulating synthetic resin.

  (3) The encircling cylindrical body has one or more gripping members capable of gripping the gripping piece by using an insulating operation rod having a pair of gripping arms that project from the outer periphery and open and close a pair of gripping arms. You may have.

  (4) The rotating cylindrical body has an annular groove on the outer periphery, and the surrounding cylindrical body protrudes from an inner wall toward the center of the rotating cylindrical body, and a tip edge of the circular circular claw fits into the annular groove. It is preferable to include two or more support members that rotatably support the rotating cylindrical body.

  The tip tool for indirect hot wire construction according to the present invention opens a pair of curved blades by rotating a common operation rod in one direction around an axis and raising a movable cylindrical body, and between a pair of curved blades. The electric wire can be introduced into the outer peripheral direction, the common operation rod is rotated in the other direction around the axis, the moving cylindrical body is lowered, and the outer periphery of the pair of curved blades is in contact with the inner wall of the rotating cylindrical body and closed. Since the electric wire can be cut, the existing common operation rod can be used, and the tip tool can be exchanged according to the application, which is convenient.

It is a figure which shows the structure of the tip tool for indirect hot wire construction by one Embodiment of this invention, FIG. 1 (A) is a top view of the tip tool for indirect hot wire construction, FIG.1 (B) shows the principal part. FIG. 1C is a left side view of the front tool for indirect hot-wire work, which is a front view of the front tool for indirect hot-wire work shown in a vertical section. It is a perspective exploded view showing composition of a tip tool for indirect hot wire construction by the embodiment. It is a front view which shows the structure of the insulation operating bar which connects the front-end tool for indirect hot wire construction by the said embodiment to a front-end | tip part. It is a longitudinal cross-sectional view which shows the structure of the front-end tool for indirect hot wire construction by the said embodiment, and is a state figure which opened a pair of curved blade. It is a longitudinal cross-sectional view which shows the structure of the front-end tool for indirect hot wire construction by the said embodiment, and is a state figure with which a pair of curved blade was closed. It is a figure which shows the structure of the cable cutter by a prior art, FIG. 6 (A) is a front view of a cable cutter, FIG.6 (B) is a left view of FIG. 6 (A). It is the schematic which shows the usage example of the cable cutter by a prior art.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of advanced tool for indirect hot-wire construction]
Initially, the structure of the tip tool for indirect hot wire construction by one Embodiment of this invention is demonstrated.

  FIG. 1 is a diagram illustrating a configuration of a tip tool for indirect hot-line work according to an embodiment of the present invention. FIG. 1 (A) is a plan view of the tip tool for indirect hot-wire work, and FIG. FIG. 1C is a left side view of the tip tool for indirect hot wire construction, with the main part shown in a longitudinal section.

  FIG. 2 is a perspective exploded view showing the configuration of the tip tool for indirect hot wire construction according to the embodiment. FIG. 3 is a front view showing a configuration of an insulating operation rod for connecting the tip tool for indirect hot wire construction to the tip portion according to the embodiment.

  FIG. 4 is a longitudinal sectional view showing the configuration of the tip tool for indirect hot wire construction according to the embodiment, and is a state diagram in which a pair of curved blades are opened. FIG. 5 is a longitudinal sectional view showing the configuration of the tip tool for indirect hot wire construction according to the embodiment, and is a state diagram in which a pair of curved blades are closed.

(overall structure)
Referring to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, a tip tool for indirect hot work (hereinafter referred to as a cable cutter) 10 according to an embodiment of the present invention includes a rotating cylinder 1, a moving cylinder 2, and A pair of curved blades 3a and 3b is provided. Further, the cable cutter 10 includes a torsion coil spring 3s as an urging member, an enclosing cylindrical body 4, and a pair of support members 5 and 5.

  With reference to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the rotating cylindrical body 1 has a cylindrical connecting fitting 12 coaxially coupled to a lower end portion of a main body portion 11 thereof. The connection fitting 12 can be detachably connected to the tip of the insulating operation rod 7 (see FIG. 3). The rotating cylindrical body 1 has a feed female thread portion 11s formed on the inner wall of the main body portion 11 (see FIG. 2 or FIG. 4).

  Referring to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the movable cylindrical body 2 has a feed male screw portion 21s screwed to the feed female screw portion 11s on the outer periphery (see FIG. 2). The movable cylindrical body 2 may be molded from an insulating synthetic resin. The moving cylindrical body 2 is housed in the rotating cylindrical body 1 in a state where the feed male screw portion 21s is screwed into the feed female screw portion 11s.

  With reference to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, when the rotating cylinder 1 is rotated in a state where the rotation of the moving cylinder 2 is restricted, the moving cylinder 2 can be moved in the axial direction. The rotating cylinder 1 and the moving cylinder 2 constitute a “single screw mechanism” in which the rotational motion of one mechanical element is converted into the linear motion of the other mechanical element.

  Referring to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the pair of curved blades 3 a and 3 b have their base end portions rotatably connected to the upper portion of the movable cylindrical body 2. The pair of curved blades 3a and 3b have cutting blade portions 31a and 31b facing each other on their inner circumferences. The pair of curved blades 3a and 3b can be closed so that the tip side intersects (see FIG. 5), and can be opened so that the tip side is separated (see FIG. 4).

  Referring to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the torsion coil spring 3s is connected to a pair of curved blades 3a and 3b. The torsion coil spring 3s biases the force in the direction in which the pair of curved blades 3a and 3b open.

  Referring to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the surrounding cylinder 4 surrounds the outer periphery of the rotating cylinder 1. The encircling cylinder 4 is connected so that the rotating cylinder 1 can rotate around its axis. Further, the surrounding cylindrical body 4 restricts the movement in the axial direction with respect to the rotating cylindrical body 1.

  Referring to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the rotating cylindrical body 1 has an annular groove 11m formed on the outer periphery of the main body 11 (see FIG. 2). The pair of support members 5 and 5 are fixed to the inner wall of the surrounding cylindrical body 4 so as to face each other. The support member 5 has an arc claw 51 at its end. The pair of arc claws 51 and 51 protrude from the inner wall of the surrounding cylindrical body 4 toward the center of the rotating cylindrical body 1. And a pair of circular arc claw 51 * 51 has those tip edges fitted in ring zone groove 11m.

(Configuration of insulation operation rod)
Referring to FIG. 3, the insulating operation rod 7 includes a tool part 71, a handle part 72, and a grip part 73. The tool part 71 can be attached to and detached from the connection fitting 12 (see FIG. 1 or FIG. 2) protruding from one end of the cable cutter 10. The grip portion 73 is provided with a slip stopper so that an operator can easily grip the grip portion 73. The handle portion 72 connects the tool portion 71 and the grip portion 73 and is formed of a long tube.

  Referring to FIG. 3, a cone-shaped draining rod 7 a is attached to an intermediate portion of the handle portion 72. The draining rod 7 a can dam the rain water that advances from the tool portion 71. Further, a conical limit rod 7b is attached to a connection portion between the handle portion 72 and the grip portion 73. The attachment position of the limit rod 7b indicates a limit at which the work can be safely performed in consideration of the insulation.

  Referring to FIG. 2 or FIG. 3, the tool part 71 has a shaft part 71a, a pair of pins 71b and 71b, and a protrusion 71c. The shaft portion 71 a protrudes in the axial direction of the handle portion 72. The pair of pins 71b and 71b have advanced from the outer periphery of the shaft portion 71a in opposite directions. The projection 71c is urged by a compression coil spring built in the tool portion 71 so as to protrude from the tip surface of the shaft portion 71a.

(Composition of connection bracket)
Referring to FIG. 1 or FIG. 2, the connection fitting 12 is formed in a cylindrical shape with an open bottom. The connection fitting 12 has a shaft hole 12h into which the shaft portion 71a of the tool portion 71 is fitted. The connection fitting 12 has a pair of T-shaped grooves 12t and 12t that are engaged by rotating the pair of pins 71b and 71b.

  Referring to FIG. 1, when the shaft portion 71 a of the tool portion 71 is inserted into the shaft hole 12 h of the connection fitting 12 and rotated by a predetermined angle, the pair of pins 71 b and 71 b are pushed by the protrusion 71 c. It can be fitted in the letter-shaped groove 12t. The insulating operation rod 7 shown in FIG. 3 is called a common operation rod, and can connect tip tools having different uses. The lock structure shown in FIG. 1 is called a twist lock.

(Configuration of moving cylinder)
Referring to FIG. 1 or FIG. 2, the movable cylindrical body 2 includes a double clevis-shaped bearing portion 21 at the distal end portion. The bearing portion 21 opens a shaft hole 21 h penetrating in a direction orthogonal to the axis center of the movable cylindrical body 2. On the other hand, each of the pair of curved blades 3a and 3b has a shaft hole 3h opened at the base end (see FIG. 2). Referring to FIG. 2, the center end of the shaft hole 21h and the center of the shaft hole 3h are made to coincide with each other, and the shaft pin 3p is press-fitted so that the base end portions of the pair of curved blades 3a and 3b can rotate freely. 21.

(Configuration of a pair of curved blades and biasing member)
As described above with reference to FIG. 2, the pair of curved blades 3 a and 3 b has their base end portions rotatably held by the bearing portion 21. Further, a torsion coil spring 3s and a collar 3c are disposed between the bearing portions 21 (see FIG. 1A), and the shaft pin 3p is inserted so that the pair of curved blades 3a and 3b in the axial direction is inserted. Movement is restricted.

  Referring to FIG. 2, the torsion coil spring 3s includes a winding portion 31s and a pair of arms 32s and 33s serving as both ends. A shaft pin 3p is inserted through the winding portion 31s. One arm 32s is locked to the intermediate portion of the curved blade 3a. The other arm 33s is locked to the intermediate portion of the curved blade 3b. The torsion coil spring 3s biases the force in the direction in which the pair of curved blades 3a and 3b open (see FIG. 4).

(Configuration of the enclosing cylinder)
Referring to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the surrounding cylindrical body 4 has a pair of first grooves 41d and 41d and a pair of second grooves 42d and 42d. The pair of first grooves 41d and 41d are cut out from the upper edge of the surrounding cylindrical body 4 so that the electric wire W can be introduced from the outer peripheral direction. On the other hand, the pair of second grooves 42d and 42d are cut out from the upper end edge of the surrounding cylindrical body 4 so as to be substantially orthogonal to the pair of first grooves 41d and 41d. In the pair of second grooves 42d and 42d, the pair of cutting blade portions 31a and 31b can be moved in a direction substantially orthogonal to the direction in which the electric wire W extends, and the positions of the pair of curved blades 3a and 3b can be regulated.

  With reference to FIG. 1 or FIG. 2 and FIG. 4 or FIG. 5, the surrounding cylindrical body 4 further includes a pair of gripping members 42 and 42. The gripping member 42 projects a gripping piece 42 t from the outer periphery of the surrounding cylindrical body 4. A gripping piece 42t can be gripped by using an insulating operation rod (not shown) provided with a pair of gripping arms for opening and closing at the tip, and the rotation angle of the pair of curved blades 3a and 3b with respect to the surrounding cylindrical body 4 on the horizontal plane Can be corrected.

[Operation of tip tool for indirect hot-wire construction]
Next, the operation and effect of the cable cutter 10 will be described while explaining the operation method of the cable cutter 10 according to the embodiment.

  With reference to FIGS. 1, 2, and 3, first, the connection fitting 12 is connected to the tip of the insulating operation rod 7, and the cable cutter 10 is lifted by operating the insulation operation rod 7. Next, referring to FIG. 3, the gripping portion 73 is rotated in one direction around the axis, whereby the moving cylinder 2 is screwed to the rotating cylinder 1 and the moving cylinder 2 can be raised. And a pair of curved blade 3a * 3b protrudes from the upper end edge of the rotation cylindrical body 1, and it is urged | biased by the torsion coil spring 3s, A pair of curved blade 3a * 3b can be opened (refer FIG. 4). .

  Next, the state shown in FIG. 4 is maintained, the cable cutter 10 is lifted, and the electric wire W is introduced from the outer peripheral direction between the pair of first grooves 41d and 41d and the pair of curved blades 3a and 3b (see FIG. 4). 2). Thereby, rotation of the surrounding cylindrical body 4 with respect to the moving cylindrical body 2 is controlled. The pair of curved blades 3a and 3b enters the pair of second grooves 42d and 42d, and the rotation is restricted. Next, referring to FIG. 3, the gripping portion 73 is rotated around the axis in the other direction, so that the moving cylinder 2 is screw-fed to the rotating cylinder 1 and the moving cylinder 2 can be lowered ( (See FIG. 5). Then, the outer circumferences of the pair of curved blades 3a and 3b abut against the inner wall of the rotating cylindrical body, so that the pair of curved blades 3a and 3b can be closed against each other against the torsion coil spring 3s ( The electric wire W can be cut | disconnected (refer FIG. 5).

  Referring to FIGS. 1 to 5, the cable cutter 10 according to the embodiment rotates the insulating operation rod 7 in one direction around the axis and raises the movable cylindrical body 2, so that the pair of curved blades 3 a and 3 b are lifted. The wire W can be introduced from the outer peripheral direction between the pair of curved blades 3a and 3b, the insulating operation rod 7 is rotated around the axis in the other direction, the moving cylindrical body 2 is lowered, and the pair of curves Since the outer circumference of the blades 3a and 3b abuts against the inner wall of the rotating cylindrical body 1 and closes, the electric wire W can be cut, so that the existing common operation rod can be used and the tip tool can be exchanged according to the application. is there.

  Moreover, the cable cutter 10 by embodiment can prevent the ground fault resulting from the contact to the charging part of a pair of curved blade 3a * 3b by comprising the movable cylindrical body 2 with the synthetic resin which has insulation.

The tip tool for indirect hot wire construction according to the present invention has the following effects.
(1) Since a common operation rod can be used without using a dedicated insulation operation, efficient work can be performed.
(2) By configuring the moving cylindrical body with a synthetic resin having insulating properties, it is possible to prevent a ground fault due to contact of the pair of curved blades with the charging unit.
(3) It is not necessary to prepare an insulation operation rod for gripping the wire when cutting the wire, and a commonly used insulation operation rod can be used.

  Although the present invention has disclosed an indirect hot wire end tool that can indirectly hot line an uninterruptible high-voltage distribution line using an insulating operation rod or the like, the tip tool of the present invention is an indirect hot wire work It is expected to be applied in other fields without being limited to the above.

DESCRIPTION OF SYMBOLS 1 Rotating cylinder 2 Moving cylinder 3a * 3b A pair of curved blade 3s Torsion coil spring (biasing member)
4 Enclosed cylinder 7 Insulation operation rod 10 Cable cutter (tip tool for indirect hot wire construction)
11s Feed female screw part 12 Connection fitting 21s Feed male screw part 31a Cutting blade part 31b Cutting blade part 41d and 41d A pair of first grooves 42d and 42d A pair of second grooves W Electric wire

Claims (4)

A tip tool for indirect hot wire construction that can cut wires using an insulating operation rod that can share tip tools with different applications,
A rotating cylindrical body having a cylindrical connection fitting to which the tip of the insulating operation rod can be connected at the lower end, and a feed female screw part formed on the inner wall;
A moving cylindrical body that forms a feed male screw portion that is screwed into the feed female screw portion on the outer periphery and moves in an axial direction with respect to the rotating cylindrical body,
A pair of curved blades that are pivotally connected to the upper portion of the moving cylindrical body and open and close so that the cutting blade portions facing each other intersect or separate;
A biasing member that biases force in a direction in which the pair of curved blades opens;
An encircling cylinder that surrounds an outer periphery of the rotating cylinder, is connected so that the rotating cylinder is rotatable about its axis, and restricts axial movement with respect to the rotating cylinder. ,
The enclosing cylinder is
A pair of first grooves cut out from the upper edge so that the electric wire can be introduced from the outer circumferential direction;
The pair of cutting blades are cut away from the upper edge so as to be substantially orthogonal to the pair of first grooves so that the pair of cutting blades can move in a direction substantially orthogonal to the direction in which the electric wires extend, and the positions of the pair of curved blades are A pair of second grooves to be regulated,
The pair of curved blades are opened by rotating the insulating operation rod in one direction around the axis to raise the movable cylindrical body, and the electric wire is introduced from the outer peripheral direction between the pair of curved blades. Then, the insulating operation rod is rotated around the axis in the other direction, the moving cylindrical body is lowered, and the outer circumferences of the pair of curved blades can be in contact with the inner walls of the rotating cylindrical body and closed. Advanced tool for indirect hot wire construction.   The tip tool for indirect hot wire construction according to claim 1, wherein the movable cylindrical body is made of an insulating synthetic resin.   The surrounding cylindrical body has one or more gripping members capable of gripping the gripping piece by using an insulating operation rod having a pair of gripping arms protruding and projecting from the outer periphery of the surrounding cylindrical body and having a pair of gripping arms at the distal end. A tip tool for indirect hot wire construction according to 1 or 2. The rotating cylinder has an annular groove on the outer periphery,
The surrounding cylindrical body protrudes from an inner wall toward the center of the rotating cylindrical body, and has a circular arc claw with a tip edge fitted into the annular groove, and two or more supporting the rotating cylindrical body rotatably. The tip tool for indirect hot wire construction according to any one of claims 1 to 3, further comprising a support member.

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