JP2010088256A - Live-line cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a live-line cutter that cuts a live-line with high efficiency of work, by rockably arranging its cable clamp at one end of a telescopic rod, and prevents the occurrence of trouble due to the inadvertent wobbling of the cable clamp. <P>SOLUTION: In this live-line cutter 1, in which first and second cable clamps 3 and 4 are arranged between both ends of the telescopic rod 2 that is possible of expansive and contractive operation, the first cable clamp 3 includes a first coupling 6, which couples its clamping mechanism 5 to one end of the telescopic rod 2 rockably between a posture in the axial direction of the telescopic rod 2 and a posture of being bent roughly 90°, and also the first coupling 6 is provided with a brake 25, which gives braking force to the free rocking of the clamping mechanism 5, and a second cable clamp 7 is provided with a second coupling 7, which couples the clamping mechanism 5 to the other end of the telescopic rod 2 in a posture in the axial direction of the telescopic rod 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot wire cutting tool used in a hot wire cutting method for cutting an electric wire such as an energized high-voltage line installed between electric poles (the electric wire in an energized state is called a live wire).

  Conventionally, as a hot-line cutting method for cutting a live wire installed between utility poles, a pair of gripping tools are used to grip the positions spaced on both sides of the cut portion, and then these gripping wires. There is a known hot-line cutting method in which a tool is connected to a pulling tool, both gripping tools are pulled together with this pulling tool to loosen the cut part of the live wire, and the cutting tool is cut in a relaxed state ( For example, see Patent Document 1).

However, the conventional hot-line cutting method has a problem in that there are many difficult processes and the work efficiency is poor. Therefore, as shown in FIG. 53, 54 is attached, and the gripper 53 at one end uses a hot wire cutting tool 51 that is rotatably connected to the telescopic rod 52, and one gripper 53 is connected to one of the cutting points of the live wire W. After being hooked on the side portion, the telescopic rod 52 is moved along the live line, the other gripper 54 is hooked on the other side portion of the cutting portion, and then the telescopic rod 52 is operated with the remote control rod 55 to contract. In this way, the live wire W is strongly held by the grippers 53 and 54, and the grippers 53 and 54 are moved closer to each other to loosen the live line W between them. A hot-line cutting method for cutting with a cutting tool 56 has been proposed (see, for example, Patent Document 2). ).
JP-A-8-331723 JP 2000-83309 A

  However, according to the hot line cutting method described in Patent Document 2, the live line can be cut efficiently, but the gripper 53 at one end of the hot line cutting tool 51 is provided with an extendable bar 52. Since the hot wire cutting tool 51 is transported to the work place or during preparation work, the gripper 53 at one end is inadvertently swung to expand and contract the rod. There is a problem that it may collide with 52 or surrounding equipment, and damage the gripper 53 itself or surrounding equipment.

  In view of the above-described conventional problems, the present invention can dispose live wires efficiently by arranging a wire gripping portion at one end of a telescopic rod so as to be swingable, and the wire gripping portion is not prepared. An object of the present invention is to provide a live line cutting tool that can prevent troubles caused by a simple swinging motion.

  The hot wire cutting tool of the present invention is a hot wire cutting tool in which first and second electric wire gripping portions are disposed at both ends of an extensible rod that can be extended and contracted. There is provided a first coupling means for coupling the gripping mechanism to one end of the telescopic rod so as to be swingable between a posture along the axial direction of the telescopic rod and a posture bent by approximately 90 °, and the first coupling means The second electric wire gripper is connected to the other end of the telescopic rod in a posture along the axial direction of the telescopic rod. The second connecting means is provided.

  According to this configuration, the gripping mechanism of the first wire gripping portion is bent to approximately 90 °, is attached to one side of the live wire cutting portion with the other end of the telescopic rod, and then remotely operated. Lift the other end of the telescopic rod with the rod, bring the telescopic rod along the live line, attach the gripping mechanism of the second electric wire gripping part to the other side of the cutting location, and then attach the telescopic rod with the remote control rod By operating and contracting, the live lines are strongly gripped by the gripping mechanisms of the first and second electric wire gripping parts, and the electric wire gripping parts move closer to each other, and the live lines between them are loosened, By cutting the slack portion with a cutting tool, the cutting method can be carried out with high work efficiency, and the first wire gripping mechanism is pivotably connected to one end of the telescopic rod. Since the braking means is provided in the connecting means, the gripping mechanism will inadvertently swing and Such as to collide equipment, without damage the gripping mechanism itself and surrounding equipment is, troubles can be prevented by inadvertent swinging operation of the gripping mechanism.

  In addition, the braking means includes a connecting plate that is non-swingably coupled to the connecting shaft at one end of the telescopic rod, a mounting lever that extends from the gripping mechanism and swings integrally with the gripping mechanism, a connecting plate, and a mounting lever. And a sliding member that slides in a state of being in pressure contact with the connecting plate as the mounting lever swings, and has a simple structure and high stability of operation, and the connecting plate of the sliding member It is possible to easily adjust the braking force to an appropriate level by adjusting the pressure contact force.

  The first connecting means includes a plurality of connecting plates that are in contact with a plurality of contact surfaces formed in parallel to each other in the axial direction of the connecting shaft at one end of the telescopic rod, and the connecting shaft and the connecting plate. A pair of coupling pins that are detachably inserted in the coupling holes formed to couple the coupling shaft and the coupling plate, and a pair of the coupling shafts that are parallel to the axial direction of the coupling shaft and perpendicular to the contact surface. An engaging member provided on the connecting plate so as to be engageable with the side end surface, and the connecting pin is configured to be foldable and slidable in a state where the tip portion protruding from the connecting hole is bent. The connecting plate and its engaging member are engaged and arranged on the connecting shaft at one end of the telescopic rod, the connecting pin is inserted into the connecting hole, and the distal end portion is bent and slid to ensure the rotation of the connecting plate. It can be connected in a state where movement is blocked, and the connecting pin is pulled out and connected. By pulling out the connecting plate and its engaging member from the shaft, the first connecting means can be easily disassembled and the first wire gripping part can be removed from the telescopic rod. The handling property can be improved.

  According to the hot wire cutting tool of the present invention, the cutting method can be carried out efficiently with the configuration in which the wire gripping portions are disposed at both ends of the telescopic rod, and the first wire gripping at one end of the telescopic rod is achieved. Since the braking means is provided in the first connecting means for swingably connecting the gripping mechanism to one end of the telescopic rod, the gripping mechanism inadvertently swings to the telescopic rod and surrounding equipment. There is no risk of collision and damage to the gripping mechanism itself or surrounding equipment, and troubles due to inadvertent swinging of the gripping mechanism can be prevented.

  Hereinafter, an embodiment of a hot line cutting tool according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the hot wire cutting tool 1 has a first wire gripping portion 3 attached to one end of a telescopic rod 2 that can be extended and contracted, and a second wire gripping portion 4 attached to the other end of the telescopic rod 2. Has been. The first electric wire gripping portion 3 has a neck as indicated by an arrow between a posture in which the gripping mechanism 5 extends in the axial direction of the telescopic rod 2 as indicated by a solid line and a posture bent by approximately 90 ° as indicated by a broken line. The first connecting means 6 is connected to one end of the telescopic rod 2 so as to be swingable. The second wire gripping portion 4 is connected to the other end of the telescopic rod 2 by the second connecting means 7 with the gripping mechanism 5 extending in the axial direction of the telescopic rod 2.

  The telescopic rod 2 includes a main body portion 8 on the other end side, and a telescopic portion 9 attached to the main body portion 8 so as to be retractable on one end side, and a rotational operation disposed on the other end portion of the main body portion 8. By engaging the tip of a remote control rod (not shown) with the part 10 and rotating it, the telescopic part 9 is retracted by a feed screw mechanism (not shown) built in the body part 8. It is configured.

  A first electric wire support 11 is attached and fixed to the outer periphery of the expansion / contraction part 9 at an appropriate distance from one end of the expansion / contraction bar 2, and the second electric wire support 11 is attached to the outer periphery of the main body part 8 at an appropriate interval from the other end of the expansion / contraction bar 2. The electric wire support 12 is mounted and fixed. The first electric wire support 11 is configured to support the electric wire by pushing the electric wire from the upper opening, and the second electric wire support 12 is configured to support the electric wire by inserting the electric wire from the opening on one side. Yes.

  As shown in FIG. 2, the gripping mechanism 5 of the first wire gripping portion 3 includes a mounting lever 13 that extends long toward the other end toward the one end of the telescopic rod 2, and one end of the mounting lever 13. Two swing levers 14a and 14b pivotally supported at one end with an appropriate interval, and a mounting member 15 pivotally supported at the other end of the swing levers 14a and 14b. The mounting lever 13, the two swing levers 14 a and 14 b, and the mounting member 15 constitute a four-bar parallel link mechanism. The two swing levers 14 a and 14 b have extension lever portions 16 a and 16 b that extend in an inverted L shape from the pivotal support portion of the mounting member 15 toward the other end, and their tips are attached to the gripping member 17. It is pivotally supported. The mounting member 15 is configured by a member having a substantially inverted L-shaped cross-section in which a receiving piece 15a for receiving an electric wire is formed so as to protrude to one side of the upper edge portion, and is removed from the distal end edge of the receiving piece 15a to prevent the electric wire from coming out. A protrusion prevention plate 18 is mounted around the mounting bolt 18a so that it can be opened and closed up and down. Thus, when the mounting lever 13 is moved to the other end side of the telescopic rod 2 in a state where the receiving piece 15a of the mounting member 15 is placed on the electric wire and the gripping mechanism 5 is attached to the electric wire, the swing levers 14a and 14b are rotated. Accordingly, the extension lever portions 16a and 16b rotate upward, the gripping member 17 translates upward, and the electric wire is firmly gripped between the receiving piece 15a and the gripping member 17.

  In the gripping mechanism 5 of the present embodiment, one swing lever 14a is provided with an auxiliary extension lever portion 19 that extends obliquely downward between the main body of the swing lever 14a and the extension lever portion 16a. Between the portion 19a and the support shaft pin 15b disposed on the mounting member 15, a change in distance between them with rotation of the swing lever 14a is allowed, and fixed by rotating the operation ring 20a. The locking lever 20 is provided, and the mounting lever 13 is instantaneously moved to one end side of the telescopic rod 2 due to the shake of the electric wire or the like by locking the electric wire between the receiving piece 15a and the holding member 17 Even so, it is configured so that the gripping of the electric wire is not released unexpectedly.

  The first connecting means 6 of the first electric wire gripping portion 3 includes a pair of connecting plates 21 disposed on both sides of the other end of the mounting lever 13, as shown in FIG. 5 to FIG. A connecting shaft 22 provided at one end of the telescopic rod 2, and a connecting pin that is removably inserted into a connecting hole 23 formed through the mounting lever 13, the connecting plate 21, and the connecting shaft 22 to connect them. 24. Further, the first connecting means 6 is provided with a braking means 25 between the mounting lever 13 and the pair of connecting plates 21 in order to apply a braking force to the free swinging of the mounting lever 13. .

  As shown in FIGS. 2 and 3, the braking means 25 is arranged so as to pass through the shaft bolts 26 so as to protrude from both surfaces of the mounting lever 13 at a suitable distance from the connecting hole 23 of the mounting lever 13. 27, the connecting plate 21 is formed with an arc-shaped long hole 28 centered on the connecting hole 23 so that the shaft bolt 26 penetrates, and the connecting plate 21 is slidable on both surfaces. A flat washer 29 serving as a sliding member and a disc spring 30 serving as a pressure contact force-applying means are arranged so as to be in contact with each other and fitted to the shaft bolt 26, and a lock nut is inserted into the shaft bolt 26 from both ends via plain washers 31. The flat washer 29 is pressed against both surfaces of the connecting plate 21 by the compression reaction force of the disc spring 30 by screwing 32 and fastening the disc spring 30 so that the braking force is applied. Yes. The arc-shaped long hole 28 is formed in an angle range of approximately 90 ° corresponding to the swing range of the mounting lever 13.

  As shown in FIGS. 4A and 4B, the connecting shaft 22 is formed with a pair of contact surfaces 33 that are parallel to each other in the axial direction, and contact surfaces 33 and 33 of the connecting shaft 22. A slit 34 for inserting and arranging the other end portion of the mounting lever 13 is formed in the central portion between them, and as shown in FIG. 7, the pair of connecting plates 21 are disposed so as to sandwich the pair of contact surfaces 33 from the outside. In addition, with the other end of the mounting lever 13 inserted and disposed in the slit 34, the connecting plate 24 and the mounting lever 13 are connected to the connecting shaft 22 by inserting the connecting pin 24 into the connecting hole 23 formed in them. It is comprised so that it may connect.

  Further, the connecting shaft 22 is formed with a pair of side end surfaces 35 that are formed parallel to the axial direction and perpendicular to the contact surface 33 and parallel to each other, as shown in FIGS. 6 (a) and 6 (b). Further, an extending piece 36 extends from the pair of connecting plates 21 toward the other end portion outside these side end faces 35, and an engaging roller 37 as an engaging member that engages the side end face 35 at the tip thereof. Is provided. Thus, as shown in FIGS. 5 to 7, the pair of connecting plates 21 are arranged in contact with the outside of the pair of contact surfaces 33 of the connecting shaft 22, and the engaging roller 37 is connected to the pair of connecting shafts 22. By engaging the side end face 35 and inserting the connecting pin 24 into the connecting hole 23, the connecting plate 21 and the connecting shaft are prevented from being rotated around the connecting pin 24 by the engaging roller 37. 22 are connected by a connecting pin 24. On the other hand, the other end of the mounting lever 13 is connected to the connecting shaft 22 so as to be rotatable around the connecting pin 24, and a braking force is applied to the turning by the braking means 25.

  As shown in FIGS. 7 and 8, the connecting pin 24 has a knob head 38, and a tip 40 protruding from the connecting hole 23 is rotatably connected around the connecting pin 39 so that the tip 40 can be connected. Further, a long hole 41 into which the coupling pin 39 is slidably engaged is provided at the distal end portion 40 so that the distal end portion 40 can be slid. Thus, the connecting pin 24 is inserted into the connecting hole 23, and as shown by a solid line in FIG. 7 and indicated by an imaginary line in FIG. Can be prevented. In addition, in the state where the connection pin 24 including the front end portion 40 is straight and the state where the front end portion 40 is slid, the front end portion 40 is releasably locked with an external force of a certain level or more. A projecting biasing member 42 is provided at a portion facing the portion 40, and engaging recesses 43a and 43b into which the projecting biasing member 42 is fitted and engaged in the two states are formed at the distal end portion 40.

  Next, the process of carrying out the hot line cutting method using the hot line cutting tool 1 having the above configuration will be described with reference to FIGS. First, as shown in FIG. 9, the first wire gripping portion 3 at one end of the telescopic rod 2 is bent at a substantially right angle with respect to the telescopic rod 2, and the other end side of the telescopic rod 2 is supported to expand and contract. The first wire gripping portion 3 at one end of the rod 2 is brought close to the wire W, and the gripping mechanism 5 of the first wire gripping portion 3 is hooked on the wire W and attached. Next, as shown in FIG. 10, the other end of the telescopic bar 2 is moved along the electric wire W by engaging the distal end of the remote control bar 44 with the rotation operation unit 10 at the other end of the telescopic bar 2. While lifting the end side, in the process, the electric wire W is pushed into the first electric wire support 11 from its upper opening so that the electric wire W is supported by the first electric wire support 11. Next, as shown in FIG. 11, after the telescopic rod 2 is positioned so that the electric wire W faces the side portion of the second electric wire support 12, the telescopic rod 2 is laterally moved to move the second electric wire support. The electric wire W is pushed into the inside of the opening 12 and the electric wire W is supported by the second electric wire support 12. Next, as shown in FIG. 12, the gripping mechanism 5 of the second wire gripping portion 4 is hooked on the wire W and attached. After that, by rotating the rotary operation unit 10 with the remote control rod 44 to contract the telescopic rod 2, the electric wires W are respectively connected by the holding mechanisms 5 and 5 of the first and second electric wire holding units 3 and 4. After being firmly gripped, the electric wire gripping portions 3 and 4 are pulled toward each other so that the electric wire W between them is loosened, and the loosened portion is cut with a remote cutting tool so that the electric wire W is Carved. Further, the cut end portions of the electric wires W are respectively supported by the first and second electric wire supports 11 and 12 and do not move carelessly, and the hot wire cutting method can be performed with good workability. .

  After carrying out the stopcock cutting method in this way, by extending the telescopic rod 2, the holding of the electric wire W by the first and second electric wire holding portions 3 and 4 is released and the hot wire cutting is performed from the electric wire W. Remove the tool 1. Thereafter, when transporting to another work place, the first connecting means 6 and the connecting shaft 22 at one end of the telescopic rod 2 are disassembled by a simple operation of extracting the connecting pin 24, and The first electric wire gripping part 3 can be removed and detailed description is omitted, but the second connecting means 7 can be expanded and contracted by the simple operation of extracting the connecting pins in the second connecting means 7 as well. Since the rod 2 is disassembled and the second wire gripping portion 4 can be removed from the telescopic rod 2, the hot wire cutting tool 1 can be disassembled in a compact manner and easily transported. Further, when assembling the hot line cutting tool 1 at the work place, the connecting plate 21 of the first connecting means 6 and the other end of the mounting lever 13 are set at predetermined positions of the connecting shaft 22 and the connecting pin 24 is inserted. The first connecting means 6 and the connecting shaft 22 at one end of the telescopic bar 2 can be easily connected with good workability, and the second connecting means 7 and the other end of the telescopic bar 2 can be easily connected as well. Can be connected with good workability, and the above stopcock cutting method can be carried out promptly.

  According to the hot-plug cutting tool 1 having the above-described configuration, the holding mechanism 5 of the first electric wire holding portion 3 can be swung to one end of the telescopic rod 2, so that the hot-cut cutting tool can be efficiently cut as described above. The construction method can be carried out, and the first connecting means 6 that swingably connects the holding mechanism 5 of the first electric wire holding portion 3 to one end of the telescopic rod 2 is provided with a braking means 25, thereby There is no risk of the mechanism 5 inadvertently swinging and colliding with the telescopic rod 2 or surrounding equipment, damaging the gripping mechanism 5 itself or surrounding equipment, and troubles due to inadvertent swinging of the gripping mechanism 5 Can be prevented.

  Further, the brake means 25 is coupled to the connecting shaft 22 at one end of the telescopic rod 2 so as not to swing, and extends from the connecting plate 21 and the gripping mechanism 5 and swings integrally with the gripping mechanism 4. A flat washer 29 as a sliding member that slides in contact with the connecting plate 21 as the mounting lever 13 swings and a disc spring 30 that applies a pressing force are disposed between the mounting lever 13 and the mounting lever 13. Because of the configuration, a stable braking action can be obtained with a simple configuration, and the pressure contact force of the flat washer 29 against the connecting plate 21 can be adjusted by tightening the lock nut 34, so that an appropriate braking force can be obtained. Can be adjusted easily.

  Further, according to the configuration of the first connecting means 6, the connecting plate 21 and the engaging roller 37 are engaged with the connecting shaft 22 at one end of the telescopic rod 2, and the connecting pin 24 is inserted into the connecting hole 23. By bending and sliding the distal end portion 40, the connection plate 21 can be reliably connected in a state in which the rotation of the connection plate 21 is prevented, and the connection pin 21 is pulled out and the connection plate 21 and its engagement are removed. By pulling out the roller 37, the first connecting means 6 can be easily disassembled and the first wire gripping part 3 can be removed from the telescopic rod 2, and the hot wire cutting tool 1 can be handled and handled during operation. Can be improved.

  The hot wire cutting tool of the present invention can perform the cutting method efficiently by the configuration in which the electric wire gripping portions are disposed at both ends of the telescopic rod, and in the first electric wire gripping portion at one end of the telescopic rod. Since the first connecting means that swingably connects the gripping mechanism to one end of the telescopic rod is provided with a braking means, the gripping mechanism inadvertently swings and collides with the telescopic rod and surrounding equipment. In addition, there is no risk of damaging the gripping mechanism itself and surrounding equipment, and it is possible to prevent troubles caused by inadvertent swinging motions of the gripping mechanism. .

The front view of the hot wire cutting tool of one Embodiment of this invention. The front view of the 1st electric wire holding part in the live wire cutting tool. The longitudinal cross-sectional top view of the braking means in the 1st connection means of the same hot-line cutting tool. The connection axis | shaft of the end of the expansion-contraction rod of the live line cutting tool is shown, (a) is a top view, (b) is a front view. The front view of the state which connected the 1st electric wire holding part of the live wire cutting tool to the end of an expansion-contraction rod. The connection state of the 1st connection means of the same hot-line cutting tool is shown, (a) is a front view, (b) is an AA arrow view of (a). The cross-sectional top view which shows the connection state of the 1st connection means of the same hot-line cutting tool. The structure of the connection pin of the same live-cutting tool is shown, (a) is a longitudinal front view, and (b) is a plan view. The front view which shows the process of attaching the 1st electric wire holding part of the live wire cutting tool to an electric wire. The front view which shows the process of inserting an electric wire in the 1st electric wire support tool of the same hot-wire cutting tool. The front view which shows the process of inserting an electric wire in the 2nd electric wire support tool of the same hot-wire cutting tool. The front view which shows the process of attaching the 2nd electric wire holding part of the same hot wire cutting tool to an electric wire. The front view which shows the hot wire cutting process by the hot wire cutting tool of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot wire cutting tool 2 Telescopic rod 3 1st electric wire holding part 4 2nd electric wire holding part 5 Gripping mechanism 6 1st connection means 7 2nd connection means 13 Mounting lever 21 Connection board 22 Connection shaft 23 Connection hole 24 connecting pin 25 braking means 29 flat washer (sliding member)
30 Spring washer (Pressure force applying means)
33 Contact surface 35 Side end surface 37 Engagement roller (engagement member)
40 Tip

Claims (3)

  A hot-wire cutting tool in which first and second electric wire gripping portions are disposed at both ends of an extensible rod that can be extended and contracted, and the gripping mechanism is connected to the first electric wire gripping portion in the axial direction of the telescopic rod. The first connecting means is provided to be connected to one end of the telescopic rod so as to be swingable between a posture along the angle of 90 degrees and a posture bent by approximately 90 °, and the first connecting means is controlled to freely swing the gripping mechanism. Brake means for applying power is provided, and the second wire gripping portion is provided with second connection means for connecting the gripping mechanism to the other end of the telescopic rod in a posture along the axial direction of the telescopic rod. A hot cutting tool characterized by   The braking means includes a connecting plate that is non-swingably coupled to the connecting shaft at one end of the telescopic rod, a mounting lever that extends from the gripping mechanism and swings integrally with the gripping mechanism, and between the connecting plate and the mounting lever. 2. The live line cutting tool according to claim 1, further comprising: a sliding member that is interposed between and slides in a state of being pressed against the connecting plate as the mounting lever swings.   The first connecting means is formed by penetrating through the connecting shaft and the connecting plate, a plurality of connecting plates in contact with the connecting shaft formed at one end of the telescopic rod in the axial direction and in parallel with each other. A connecting pin that is detachably inserted into the formed connecting hole and connects the connecting shaft and the connecting plate, and a pair of side end surfaces that are formed parallel to the connecting shaft in the axial direction and perpendicular to the contact surface. And an engaging member provided on the connecting plate so as to be engageable with the connecting pin, and the connecting pin is configured to be foldable and slidable in a bent state at the tip protruding from the connecting hole. The hot wire cutting tool according to claim 1 or 2.

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