Electric tool

Abstract

The purpose of the present invention is to provide an electric tool (1) having a structure that can reduce the burden on an operator without requiring a processing operation of piping and wiring, can prevent entry of waste and air into a hydraulic pump, and can perform stable and highly reliable operation. An electric tool (1) is provided with a tool head (3) that operates by hydraulic force, a cylindrical section (5), and a main body section (2), the tool head (3) is provided with a machining tool (3a) and a cylinder section (4), and the main body section (2) is provided with a hydraulic section (8), an oil tank (6a), a hydraulic pump (6), a motor (7), and a secondary battery (9). The cylinder section (4) and the hydraulic section (8) are connected by a pipe (5c), and the hydraulic section (8) has a structure having a partition (8a) that reciprocates along an axis (P1) passing through a drive shaft (7a) of the motor (7).

Description

Technical Field

[0001] The invention relates to an electric tool for indirect live-line working. Background Art

[0002] Conventionally, there has been proposed an electric tool in which a tool head is attached to the front end of a vertically long operating rod (synonymous with an operating stick) (Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-180373, Patent Document 2: Japanese Utility Model Application Publication No. 4-7606).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-180373

[0006] Patent Document 2: Japanese Utility Model Publication No. 4-7606 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] The electric tool described in Patent Document 1 has a structure in which the electric motor and the tool head are gear-connected by means of a connecting shaft. In the case of a longitudinally long operating rod, the driving force required for live working is insufficient, and the workability is poor. The electric tool described in Patent Document 2 uses hydraulic pressure, so sufficient driving force can be obtained. However, it is necessary to connect the hydraulic hose and the power cord to the work vehicle, and the piping and wiring processing is cumbersome, which becomes a burden for the operator. In addition, sometimes garbage and air will invade the hydraulic pipeline, which causes the problem of cumbersome maintenance work.

[0009] Solutions for solving problems

[0010] The present invention has been made in view of the above circumstances, and an object thereof is to provide an electric tool having a structure that can reduce the burden on operators by eliminating the need for piping and wiring processing, and can prevent dirt and air from entering the hydraulic pump, thereby enabling stable and highly reliable operation.

[0011] As a technical solution, the above-mentioned problem is solved by the following disclosed solution.

[0012] The electric tool of the present invention is characterized in that the electric tool comprises: a tool head, which works by utilizing the hydraulic pressure of a piston; a cylindrical portion, which is connected to the tool head; and a main body, which is installed on the cylindrical portion, the tool head comprises: a processing tool; and a cylinder portion, which comprises the piston, and the main body comprises: a hydraulic portion; an oil tank; a hydraulic pump, which transports the working oil in the oil tank to the hydraulic portion; a motor, which drives the hydraulic pump; and a secondary battery, which supplies power to the motor, the cylinder portion and the hydraulic portion are connected by a pipe, and the hydraulic portion has a partition that reciprocates along the axis of a drive shaft passing through the motor.

[0013] According to this structure, sufficient driving force can be obtained by using hydraulic pressure. In addition, the burden on operators can be reduced by eliminating the need for handling piping and wiring, and the operating range can be expanded by battery drive. In addition, by providing a partition in the hydraulic unit, it is possible to prevent dirt and air from intruding into the hydraulic pump, thereby enabling stable and highly reliable operation.

[0014] Preferably, the cylinder part has a built-in first spring for urging the piston toward the hydraulic pump, and the hydraulic part has a built-in second spring for urging the partition toward the hydraulic pump. According to this structure, when the processing tool is returned to the initial position after processing by the tool head, the restoring force of the second spring is used in addition to the restoring force of the first spring, thereby increasing the return speed of the processing tool and improving the working speed.

[0015] As an example, the electric tool has the following structure: the piping includes a first coupler and a second coupler, the first coupler is arranged at the front end side portion of the cylindrical portion, and the second coupler is arranged at the rear end side portion of the cylindrical portion. By providing the first coupler, the tool head can be easily replaced. In addition, by providing the second coupler, the cylindrical portion can be easily separated for maintenance or assembled. Thus, a structure with excellent productivity and maintainability can be achieved.

[0016] As an example, the electric tool has the following structure: the piston, the partition and the motor are arranged in sequence in the length direction, and the main body is provided with a handle along the length direction. By providing the handle along the length direction, the operator can easily hold the main body, thereby improving workability.

[0017] As an example, the electric tool has the following structure: the cylindrical portion is formed of a first insulating material, the piping includes a hydraulic hose formed of a second insulating material, and the hydraulic hose is built into the cylindrical portion. By building the hydraulic hose into the cylindrical portion, the electric tool can be made compact, and the working oil has a double-layer insulation structure, thereby further improving safety.

[0018] Effects of the Invention

[0019] According to the present invention, it is possible to realize an electric power tool having a structure that does not require pipe and wire handling work to reduce the burden on operators, can prevent dirt and air from entering the hydraulic pump, and can operate stably and with high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic perspective view showing an example of an electric power tool according to an embodiment of the present invention.

[0021] Figure 2 A is Figure 1 The schematic left side view of the electric tool shown, Figure 2 B is Figure 1 A schematic front view of the electric tool shown, Figure 2 C is Figure 1 A schematic right side view of the power tool shown, Figure 2 D is Figure 1 A rear view of the schematic of the power tool is shown.

[0022] Figure 3 Yes means Figure 1 Schematic partial cross-sectional view of a first example of the electric tool shown.

[0023] Figure 4 It is a magnified representation Figure 3 A schematic partial cross-sectional view showing the structure of a hydraulic unit of an electric tool is shown.

[0024] Figure 5 Yes means Figure 1 Schematic partial cross-sectional view of a second example of the electric tool shown.

[0025] Figure 6 It is a schematic partial cross-sectional view showing another example of the tool head. DETAILED DESCRIPTION

[0026] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. This embodiment is an electric tool 1 having a structure in which a tool head 3, a cylindrical portion 5, and a main body 2 are connected, and is an electrician's tool used for indirect live-line work such as compression joining of installed wires and cutting of the aforementioned wires. Figure 1 It is a schematic perspective view showing an example of the electric tool 1 according to the present embodiment. Figure 2 A is a schematic left side view of the electric tool 1. Figure 2 B is a schematic front view of the electric tool 1. Figure 2 C is a schematic right side view of the electric tool 1. Figure 2D is a schematic rear view of the power tool 1. Here, in order to easily explain the positional relationship of each part of the power tool 1, the directions are indicated by arrows X, Y, and Z in the figure. In addition, the power tool 1 can work normally in any direction regardless of the direction during operation.

[0027] [Example 1]

[0028] Figure 3 FIG. 1 is a schematic partial cross-sectional view showing a first example of the electric tool 1. Figure 3 As shown, the electric tool 1 utilizes the electric power of the battery pack 9 to drive the motor 7, and utilizes the driving force of the motor 7 to drive the hydraulic pump 6. Then, the hydraulic pump 6 delivers the first working oil 11 stored in the oil tank 6a to the hydraulic section 8, and utilizes the first working oil 11 in the first hydraulic chamber 8c1 to push the partition 8a disposed in the hydraulic section 8, and utilizes the partition 8a to push the second working oil 12 in the second hydraulic chamber 8c2, and utilizes the hydraulic pressure of the second working oil 12 to operate the piston 4a in the cylinder section 4 through the pipe 5c, thereby operating the tool head 3. The electric tool 1 is a portable and cordless electric tool 1 having the above-mentioned structure. The partition 8a reciprocates in the Z direction along the first axis P1. The piston 4a reciprocates in the Z direction along the second axis P2. As an example, the axis P1 is parallel to the axis P2.

[0029] like Figure 3 As shown, the electric tool 1 has: a tool head 3, which is equipped with a processing tool 3a; a cylindrical portion 5, which is connected to the tool head 3; and a main body 2, which is installed on the cylindrical portion 5. The cylindrical portion 5 is formed of a first insulating material having a structure in which an insulating coating is formed on the outer periphery and inner periphery of an insulating resin, metal, etc., and flanges 5d are provided at specified intervals. The flange 5d functions as a limiting flange and a water-retaining flange to improve the insulation and weather resistance of the cylindrical portion 5. The cylindrical portion 5 has a first coupler 5a built into the front end side and a second coupler 5b built into the rear end side, and the first coupler 5a and the second coupler 5b are connected by piping. The piping 5c ​​is a hydraulic hose formed of a pressure-resistant and liquid-resistant second insulating material, and is built into the cylindrical portion 5. The cylinder portion 4 in the tool head 3 is connected to the first coupler 5a in a manner that allows it to be detached relative to the first coupler 5a, the first coupler 5a is connected to the joint portion 24, the joint portion 24 is connected to the piping 5c, the piping 5c ​​is connected to the second coupler 5b, and the second coupler 5b is connected to the hydraulic portion 8 in the main body 2 in a manner that allows it to be detached relative to the hydraulic portion 8 in the main body 2, thereby forming a hydraulic pipeline.

[0030] As an example, a processing tool 3a having a size corresponding to the size of the compression sleeve and the size of the crimping terminal is mounted on the tool head 3. The electric tool 1 can be operated by replacing the tool head 3 according to the purpose of compression, crimping processing, wire breaking processing, etc. The joint part 24 is provided in a manner that the second coupler 5b is arranged on the first axis P1 parallel to the second axis P2 passing through the first coupler 5a. The joint part 24 has a structure that maintains a locked state and an unlocked state, and the relative position of the tool head 3 and the main body 2 can be adjusted more freely.

[0031] The main body 2 has a housing 2a made of metal or a combination of metal and resin. A hydraulic pump 6, an oil tank 6a, a motor 7, and a control circuit 7d for controlling the motor 7 are provided inside the housing 2a. As an example, the hydraulic pump 6 is a swash plate type piston pump having a swash plate cam 7b and a plurality of plungers 7c, the swash plate cam 7b being rotated by the drive shaft 7a of the motor 7, and the plurality of plungers 7c being arranged around a first axis P1 passing through the drive shaft 7a, and reciprocating along the first axis P1 while contacting the swash plate cam 7b. In addition, the hydraulic pump 6 is not limited to a structure using the swash plate cam 7b, and a known hydraulic pump can be applied.

[0032] The battery pack 9 is composed of secondary batteries such as lithium-ion batteries and nickel-metal hydride batteries, and supplies power to the motor 7 and the control circuit 7d. The battery pack 9 is connected to the adapter 2d in a manner that allows engagement and disengagement. In addition, a cage-shaped cover 9a that surrounds and protects the battery pack 9 is connected to the adapter 2d. The cover 9a is made of metal and has a flat bottom, so the power tool 1 can be placed upright against a wall or the like. The battery pack acts as a counterweight near the hand, so that the center of gravity is close to the operator, so that the tool head can be easily balanced. In addition, the structure is not limited to this, and sometimes a structure is set in which the secondary battery 9 is built into the main body 2.

[0033] As an example, the housing 2a is formed with a handle 2b and an adapter 2d. The handle 2b is a grip portion for the operator to hold, and the start switch 2c is arranged inward. When the start switch 2c is pressed, the motor 7 becomes in an operable state. As an example, the control circuit 7d is a CPU composed of a single chip.

[0034] The third axis P3 passing through the length direction of the handle 2b is substantially parallel to or intersects with the second axis P2 passing through the first coupler 5a at an acute angle. Figure 3 In the example shown, the intersection angle K is 15 degrees or less. According to this structure, the operator can easily hold the handle 2b of the electric tool 1, and the workability of the live work is improved.

[0035] Figure 4 1 is a partial cross-sectional view showing an enlarged schematic structure of the hydraulic unit 8 in the electric tool 1. Figure 4As shown, the first working oil 11 stored in the oil tank 6a is delivered to the hydraulic unit 8 by the hydraulic pump 6, and the first working oil 11 in the first hydraulic chamber 8c1 pushes the partition 8a arranged in the hydraulic unit 8, and the partition 8a pushes the second working oil 12 in the second hydraulic chamber 8c2, and the piston 4a in the cylinder 4 is operated by the hydraulic pressure of the second working oil 12 through the pipe 5c, so that the tool head 3 is operated. According to this structure, the first working oil 11 and the second working oil 12 are divided by the partition 8a. With this structure, it is possible to prevent dirt and air from entering the hydraulic pump 6, and stable and highly reliable operation can be achieved.

[0036] The oil tank 6a is arranged at a position connecting the hydraulic section 8 and the hydraulic pump 6. The oil tank 6a is connected to the hydraulic pump 6 via a one-way valve (not shown). In addition, the oil tank 6a is connected to the hydraulic section 8 via a relief valve 6c. When the tool head 3 completes the work, the piston 4a and the partition 8a return to the initial position. The cylinder section 4 has a built-in first spring 4b for returning the piston 4a to the initial position. The hydraulic section 8 has a built-in second spring 8b for returning the partition 8a to the initial position. According to this structure, when returning the processing tool 3a to the initial position after processing by the tool head 3, in addition to using the restoring force of the first spring 4b, the restoring force of the second spring 8b is also used, thereby increasing the return speed of the processing tool 3a and improving the working speed.

[0037] Figure 6 It is a schematic partial cross-sectional view showing another example of the tool head 3 . Figure 6 The example shown is a structure in which the processing tool 3b in the tool head 3 is a wire cutting blade. In this embodiment, the tool head 3 can be replaced according to the wire compression joining operation, wire cutting operation, wire coating stripping operation, and other known indirect live operations.

[0038] [Example 2]

[0039] Figure 5 It is a schematic partial cross-sectional view showing a second example of the electric tool 1 . Figure 5 The example shown is a simplified structure in which the first coupler 5a and the second coupler 5b are omitted, thereby reducing the number of components.

[0040] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

Claims

1. An electric tool, characterized in that: The electric tool comprises: a tool head, which works by the hydraulic pressure of a piston; a cylindrical part, which is connected to the tool head; and a main body, which is mounted on the cylindrical part, wherein the tool head comprises: a processing tool; and a cylinder part, which comprises the piston; and the main body comprises: a hydraulic part; an oil tank; and a hydraulic pump, which delivers the working oil in the oil tank to the hydraulic part; a motor that drives the hydraulic pump; and a secondary battery that supplies power to the motor, wherein the cylinder unit and the hydraulic unit are connected by piping, The hydraulic portion has a partition that reciprocates along an axis passing through a drive shaft of the motor.

2. The electric tool according to claim 1, characterized in that: The cylinder portion has a first spring built therein for urging the piston toward the hydraulic pump. The hydraulic unit includes a second spring that biases the partition member toward the hydraulic pump.

3. The electric tool according to claim 1, characterized in that: The pipe includes a first coupler and a second coupler, the first coupler being arranged at a front end side portion of the cylindrical portion, and the second coupler being arranged at a rear end side portion of the cylindrical portion.

4. The electric tool according to claim 2, characterized in that: The pipe includes a first coupler and a second coupler, the first coupler being arranged at a front end side portion of the cylindrical portion, and the second coupler being arranged at a rear end side portion of the cylindrical portion.

5. The electric tool according to claim 1, characterized in that: The piston, the separator and the motor are arranged in sequence in the length direction. The main body is provided with a handle along the length direction.

6. The electric tool according to claim 2, characterized in that: The piston, the separator and the motor are arranged in sequence in the length direction. The main body is provided with a handle along the length direction.

7. The electric tool according to claim 3, characterized in that: The piston, the separator and the motor are arranged in sequence in the length direction. The main body is provided with a handle along the length direction.

8. The electric tool according to any one of claims 1 to 7, characterized in that: The cylindrical portion is formed of a first insulating material, and the pipe includes a hydraulic hose formed of a second insulating material, and the hydraulic hose is housed in the cylindrical portion.

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