Wire cutting device

Abstract

To provide a wire cutting device that can be used regardless of weather conditions and that enables a blade to be operated as desired by supplying a large torque to the blade.SOLUTION: A wire cutting device 100 is used to cut a wire 20 at a high place by working from ground level. A configuration of the wire cutting device includes a connection part 110 that is connected to a stick 200 for working at a high place, a chain wheel 130 rotatably mounted on the connection part, a chain 140 for rotating the chain wheel, a feed screw 150 rotating in conjunction with the chain wheel, a feed nut 152 movably screwed to the feed screw, and a wire cutter 160 with a static blade and a dynamic blade. A handle of the static blade is axially supported on the connection part. A handle of the dynamic blade is axially supported on the feed nut. The wire cutter opens and closes when the chain wheel is rotated.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric wire cutting device for cutting electric wires at high altitudes by working from the ground. [Background technology]

[0002] Electricity generated at an electric utility's power plant and transformed at a substation is transmitted through high-voltage lines strung on utility poles. Transformers attached to these poles transform the voltage at the time of transmission (e.g., 6,600 V) to the voltage used by consumers (e.g., 100 V or 200 V), and the electricity is then supplied to consumers through service lines.

[0003] When working on high-altitude electric wires such as drop wires, workers may work while riding in the basket or bucket of an aerial work vehicle. However, depending on the width of the road at the removal site, there are some places where an aerial work vehicle cannot enter. In such cases, work must be done using an aerial work platform or long ladder, but because drop wires are heavy, the weight (tension) of the cut wire can cause the aerial work platform or long ladder to become unbalanced.

[0004] In addition, aerial work platforms take half a day to assemble and half a day to dismantle, which increases work time and removal costs. Long ladders require a pair of workers, one to work at height and one to support the bottom of the ladder, which increases labor costs.

[0005] Therefore, as a tool used when working on high-place electric wires from the ground, for example, Patent Document 1 discloses an "indirect live-line insulation operating rod used for stripping, cutting, bending, etc., electric wires suspended at high places." The indirect live-line insulation operating rod in Patent Document 1 is composed of "a rotating operating part located at the base end, an insulated rotating pipe having one end rotated by the rotating operating part, a tool holder that is selectively attached and detached to the other end of the insulated rotating pipe and holds a tool tip, and an insulated fixed pipe that connects the rotating operating part and the tool tip holder."

[0006] The fixed insulating pipe of Patent Document 1 can be used to cut electric wires by connecting a cutting tool as an end tool to the tool holder. In particular, in Patent Document 1, the input shaft of the rotation operating unit is rotated by an electric motor or a manual handle to open and close a pair of electric wire cutting blades of the cutting tool, thereby cutting the electric wire. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-142009 Summary of the Invention [Problem to be solved by the invention]

[0008] The electric motor in Patent Document 1 is suitable as a power source due to its high torque, but is not suitable for use in rainy weather. The manual handle can be used even in rainy weather, thereby compensating for the shortcomings of the electric motor. However, because the manual handle has low torque, if the blade gets caught in the electric wire when cutting it, it is difficult to move the blade in a direction away from the wire. This forces the worker to use a long ladder or the like to reach a high place and remove the blade from the wire.

[0009] In view of these problems, the present invention aims to provide an electric wire cutting device that can be used regardless of weather and that can operate the blade as desired by supplying a large torque to the blade. [Means for solving the problem]

[0010] In order to solve the above problems, a typical configuration of the electric wire cutting device of the present invention is an electric wire cutting device that cuts electric wires at high altitudes by working from the ground, and includes a connection part that is connected to a stick for working at high altitudes, a chain wheel rotatably attached to the connection part, a chain that rotates the chain wheel, a feed screw that rotates in conjunction with the chain wheel, a feed nut that is movably screwed onto the feed screw, and a wire cutter equipped with a stationary blade and a moving blade, wherein the handle of the stationary blade is journaled on the connection part, and the handle of the moving blade is journaled on the feed nut, and the wire cutter opens and closes when the chain wheel is rotated.

[0011] According to the present invention, it is possible to provide an electric wire cutting device that can be used regardless of weather and that can operate the blade as desired by supplying a large torque to the blade. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram showing a usage state of the electric wire cutting device according to the present embodiment. [Figure 2] 1 is an overall view of an electric wire cutting device according to an embodiment of the present invention; [Figure 3] 1 is an overall view of an electric wire cutting device according to an embodiment of the present invention; [Figure 4] 5A to 5C are diagrams illustrating the operation of the electric wire cutting device of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0014] Fig. 1 is a diagram showing how an electric wire cutting device 100 according to this embodiment is used. As shown in Fig. 1, the electric wire cutting device 100 according to this embodiment is attached to the tip of a stick 200 for working at height, and is used for cutting an electric wire 20 (e.g., a drop wire) at a height that is stretched on an electric pole 10 by working from the ground.

[0015] 2 and 3 are overall views of the electric wire cutting device 100 of this embodiment. Fig. 2(a) is a front view of the electric wire cutting device 100. Fig. 2(b) is a rear view of the electric wire cutting device 100. Fig. 3(a) is a left side view of the electric wire cutting device 100 shown in Fig. 2(b). Fig. 3(b) is a right side view of the electric wire cutting device 100 shown in Fig. 2(b). For ease of understanding, the chain 140 is not shown in Fig. 3(a).

[0016] 2(a) and 2(b), the electric wire cutting device 100 of this embodiment has a connection part 110 that is connected to a stick 200 for working at height (see FIG. 1), and a gear box 120 is attached to a position midway through the connection part 110. A chain wheel 130 is rotatably attached to the gear box 120. That is, in the electric wire cutting device 100 of this embodiment, the chain wheel 130 is rotatably attached to the connection part 110 via the gear box 120.

[0017] As shown in Figure 3(a), a chain-shaped groove 132 is formed on the circumferential surface of the chain wheel 130. As a result, when the chain 140 is wound around the circumferential surface of the chain wheel 130 as shown in Figure 3(b), the chain 140 fits into the groove 132. When the chain 140 is pulled, the chain wheel 130 rotates in conjunction with the chain 140.

[0018] The shaft 134 of the chain wheel 130 is connected to a gear box 120, and the gear box 120 is connected to a feed screw 150 that opens and closes the wire cutter 160. A linkage mechanism (e.g., a bevel gear) that transmits the rotational force of the chain wheel 130 to the feed screw 150 is housed inside the gear box 120 (not shown). As a result, when the chain wheel 130 rotates, the feed screw 150 rotates in conjunction with it.

[0019] A feed nut 152 is threadedly engaged with the feed screw 150. The feed nut 152 can move the feed screw 150 up and down as the feed screw 150 rotates. That is, in the electric wire cutting device 100 of this embodiment, when the chain wheel 130 rotates, the feed screw 150 rotates in conjunction with the rotation, and the feed nut 152 moves up and down.

[0020] 4 is a diagram illustrating the operation of the electric wire cutting device 100 of this embodiment. As shown in FIG. 2(b) and FIG. 4, the wire cutter 160 includes a stationary blade 170 and a moving blade 180. The stationary blade 170 and the moving blade 180 are connected at a connecting portion 162 and can be opened and closed around the connecting portion 162.

[0021] Cutting edges 172 and 182 are formed on opposing sides of the stationary blade 170 and the moving blade 180. A handle 174 of the stationary blade 170 is journaled to the connecting portion 110 by a bolt 176, and a handle 184 of the moving blade 180 is journaled to the feed nut 152 by a bolt 186.

[0022] When cutting the electric wire 20 (see FIG. 1) using the electric wire cutting device 100 of this embodiment, the stationary blade 170 and the moving blade 180 are opened as shown in FIG. 2(b), and the electric wire 20 is placed between the cutting blades 172 and 182. When the chain 140 is pulled in the D1 direction in FIG. 4, the chain wheel 130 rotates in the D2 direction.

[0023] Then, the rotational force of the chain wheel 130 is transmitted to the feed screw 150 via the gear box 120, causing the feed screw 150 to rotate in the direction D3. As a result, the feed nut 152 is lowered in the direction D4 by the feed screw 150, and the stationary blade 170 and the moving blade 180 rotate around the connecting portion 162. Then, the stationary blade 170 and the moving blade 180 enter a closed state, and the cutting blades 172 and 182 mesh with each other to cut the electric wire 20.

[0024] When the stationary blade 170 and the moving blade 180 are changed from the closed state to the open state, the chain 140 on the opposite side of the chain wheel 130 is pulled. This causes the chain wheel 130, the feed screw 150, and the feed nut 152 to move in the opposite direction to when cutting the electric wire, causing the cutting blades 172 and 182 to move apart, and the stationary blade 170 and the moving blade 180 to enter the open state.

[0025] As described above, in the electric wire cutting device 100 of this embodiment, the static blade 170 and the moving blade 180 of the wire cutter 160 are opened and closed by rotating the chain wheel 130, thereby cutting the electric wire 20. With this configuration, no electricity is used to operate the electric wire cutting device 100, so it can be used suitably even in rainy weather.

[0026] Furthermore, by using the rotational force of the chain wheel 130, a large torque can be obtained by rotating the chain 140. Therefore, even if the cutting blades 172 and 182 bite into the electric wire when cutting the electric wire 20, the cutting blades 172 and 182 can be easily separated and removed from the electric wire 20. Therefore, the electric wire cutting work can be performed efficiently, and the burden on the worker can be reduced.

[0027] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that such modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0028] The present invention can be used as an electric wire cutting device for cutting electric wires at high altitudes by working from the ground. [Explanation of symbols]

[0029] 10...electric pole, 20...electric wire, 100...electric wire cutting device, 110...connection part, 120...gear box, 130...chain wheel, 132...groove, 134...shaft, 140...chain, 150...feed screw, 152...feed nut, 160...wire cutter, 162...connection part, 170...stationary blade, 172...cutting blade, 174...handle, 176...bolt, 180...moving blade, 182...cutting blade, 184...handle, 186...bolt, 200...stick

Claims

[Claim 1] An electric wire cutting device that cuts electric wires at high altitudes by working from the ground, a connection part that is connected to a stick for working at height; a chain wheel rotatably attached to the connecting portion; a chain that rotates the chain wheel; a feed screw that rotates in conjunction with the chain wheel; a feed nut that is movably threadedly engaged with the feed screw; a wire cutter equipped with a stationary blade and a moving blade; Including, The handle of the stationary blade is pivotally supported on the connection part, The handle of the moving blade is journalled on the feed nut, The wire cutting device is characterized in that the wire cutter opens and closes when the chain wheel is rotated.

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