JP7768107B2 - wire cutting device - Google Patents

Description

The present invention relates to an electric wire cutting device that cuts electric wires at high altitudes by working from the ground.

Electricity generated at an electric utility's power plant and transformed at a substation is transmitted through high-voltage lines strung on utility poles, where it is transformed by transformers attached to the poles from 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 then supplied to consumers through service lines.

When working on high-altitude electric wires such as drop lines, workers often 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 carried out using an aerial work platform or long ladder, but because drop lines are heavy, the weight (tension) of the cut line can cause the aerial work platform or long ladder to become unbalanced.

In addition, aerial work platforms take half a day to assemble and about half a day to dismantle, which increases work time and removal costs. With long ladders, two workers are required to work together - one to work at height and one to support the bottom of the ladder - which increases labor costs.

As a tool used when working on high-altitude 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 altitudes." 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 whose one end is rotated by the rotating operating part, a tool holder that is selectively attached and detached to the other end of the insulated rotating pipe to hold a tool tip, and an insulated fixed pipe that connects the rotating operating part and the tool holder."

The insulated fixed pipe of Patent Document 1 can be used to cut electric wires by connecting a cutting tool to the tool holder as an end tool. In particular, Patent Document 1 shows that the input shaft of the rotary 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.

Japanese Patent Application Laid-Open No. 2009-142009

The electric motor in Patent Document 1 has a high torque, making it suitable as a power source, but is not suitable for use in rainy weather. A manual handle can be used in rainy weather, making up for the shortcomings of an electric motor. However, because the manual handle has a low torque, if the blade gets caught in the wire when cutting it, it is difficult to move the blade away from the wire. This forces the worker to use a long ladder or similar to reach a high location and remove the blade from the wire.

In light of these issues, the present invention aims to provide an electric wire cutting device that can be used regardless of weather and that can supply a large torque to the blade, allowing the blade to be operated as desired.

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 can be used to cut electric wires at high altitudes by working from the ground, and includes a connection part that connects 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 movably screws onto the feed screw, and a wire cutter equipped with a stationary blade and a moving blade, with the handle of the stationary blade journaled on the connection part and the handle of the moving blade journaled on the feed nut, and the wire cutter opens and closes when the chain wheel is rotated.

The present invention provides 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.

1 is a diagram showing a usage state of the electric wire cutting device according to the present embodiment. 1 is an overall view of an electric wire cutting device according to an embodiment of the present invention; 1 is an overall view of an electric wire cutting device according to an embodiment of the present invention; 5A to 5C are diagrams illustrating the operation of the electric wire cutting device of the present embodiment.

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 these embodiments are merely examples intended to facilitate understanding of the invention and, unless otherwise specified, do not limit the present invention. Furthermore, 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.

Figure 1 is a diagram showing how the electric wire cutting device 100 of this embodiment is used. As shown in Figure 1, the electric wire cutting device 100 of this embodiment is attached to the tip of a stick 200 for working at height, and is used to cut high-altitude electric wires 20 (e.g., drop wires) strung on utility poles 10 from the ground.

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

As shown in Figures 2(a) and (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 Figure 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.

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 it.

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

A feed nut 152 is threaded onto the feed screw 150. The feed nut 152 can move the feed screw 150 up and down as the feed screw 150 rotates. In other words, in the electric wire cutting device 100 of this embodiment, when the chain wheel 130 rotates, the feed screw 150 rotates in conjunction with it, causing the feed nut 152 to move up and down.

Figure 4 is a diagram illustrating the operation of the electric wire cutting device 100 of this embodiment. As shown in Figures 2(b) and 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.

The fixed blade 170 and the moving blade 180 have cutting edges 172 and 182 formed on their opposing sides, respectively. The handle 174 of the fixed blade 170 is journaled to the connecting part 110 by a bolt 176, and the handle 184 of the moving blade 180 is journaled to the feed nut 152 by a bolt 186.

When cutting an electric wire 20 (see Figure 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 Figure 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 Figure 4, the chain wheel 130 rotates in the D2 direction.

The rotational force of the chain wheel 130 is then transmitted via the gearbox 120 to the feed screw 150, 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 moving blade 180 rotate around the connecting portion 162. The stationary blade 170 and moving blade 180 then enter a closed state, and the cutting blades 172 and 182 mesh together to cut the electric wire 20.

When the stationary blade 170 and the moving blade 180 are changed from a closed state to an open state, the chain 140 on the opposite side of the chain wheel 130 is pulled. This causes the chain wheel 130, feed screw 150, and 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 open.

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 required to operate the electric wire cutting device 100, making it suitable for use even in rainy weather.

In addition, by using the rotational force of the chain wheel 130, a large torque can be generated by rotating the chain 140. Therefore, even if the cutting blades 172 and 182 become caught in 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. This allows for efficient wire cutting work and reduces the burden on the worker.

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 a person skilled in the art could conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

This invention can be used as an electric wire cutting device that cuts electric wires at high altitudes by working from the ground.

10... Utility 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 (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.