JP7489103B2 - Hydraulic Actuator - Google Patents

Description

The present invention relates to a hydraulically actuated device.

For example, portable hydraulic actuators are used to rescue people trapped in vehicles following traffic accidents or in buildings following earthquakes. Conventional hydraulic actuators include a device in which a cutting tool such as a cutter or spreader is attached directly to a motorized pump that generates pressurized oil, as disclosed in Patent Document 1, and a device in which a cutting tool and a motorized pump are connected by a hydraulic hose, as disclosed in Patent Document 2.

JP 2002-78988 A JP 2005-201285 A

In a device in which a tool tip is directly attached to a motorized pump unit, as disclosed in Patent Document 1, there are problems in that the weight of the device itself becomes large, making it difficult to carry, and the motor unit can get in the way when performing work, preventing the device from performing its intended functions.

On the other hand, in a device in which the tool tip and the motorized pump are connected by a hydraulic hose as disclosed in Patent Document 2, there is a problem that both the person who operates the tool tip and the person who operates the motorized pump are required. That is, the person who operates the tool tip inserts the tool tip into the part of the vehicle or building that is to be pried open. In this state, when the person who operates the motorized pump presses the switch with their finger to operate the motor, the tool tip operates, and when they remove their finger from the switch to stop the motor, the tool tip stops. When the person who operates the motorized pump pulls the return lever, the spool moves inside the pump and the return passage for the pressurized oil opens. This returns the tool tip to its initial state. Since such a device requires two people to operate, there is a problem that if communication between the person who operates the tool tip and the person who operates the motorized pump is poor, the work may not be performed properly.

The present invention was made in consideration of these points, and aims to provide a hydraulic actuator that allows a single worker to operate a tool when the work area at the site is narrow and work needs to be performed with the drive unit and tool unit separated, thereby improving workability.

The hydraulic actuator of the present invention comprises:
a drive unit including a motor and a pressurized oil generating section that generates pressurized oil by rotating a rotating member by the motor;
a tool unit including a tool operated by pressure oil and a switch unit including a pressure oil generating unit activation switch and a tool activation switch;
a flexible connecting member that connects the tool unit and the drive unit, supplies the pressure oil generated by the pressure oil generating unit to the tool, and returns return oil from the tool to the pressure oil generating unit;
a battery unit having a battery for supplying power to the drive unit;
a return operation unit that can be attached to the drive unit and that starts an operation of returning return oil from the tool to the drive unit via the connection member;
Equipped with
When the pressurized oil generating unit activation switch is operated, power is supplied from the battery to the motor, causing the pressurized oil generating unit to generate pressurized oil, and the generated pressurized oil is supplied to the tool unit by the connecting member,
When the tool operation switch is operated, the return operation portion is actuated, whereby return oil is returned from the tool through the connecting member to the drive unit.

The hydraulic actuator of the present invention allows a single worker to operate the tool when the work area at the site is small and work needs to be performed with the drive unit and tool unit separated, thereby improving workability.

1 is a configuration diagram showing a configuration of a hydraulically actuated device according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing a state in which a tool tip of the hydraulic actuator shown in FIG. 1 is in operation. FIG. 2 is a circuit diagram of the hydraulically actuated device shown in FIG. 1 etc. FIG. 2 is an enlarged configuration diagram showing a pushing member and a spool valve attached to a tip of a solenoid in the hydraulic actuator shown in FIG. 1 etc. FIG. 1 is a diagram showing the configuration of a conventional hydraulically actuated device. 6 is a configuration diagram showing a state in which a tool tip of the hydraulic actuator shown in FIG. 5 is in operation. FIG.

The following describes an embodiment of the present invention with reference to the drawings. The hydraulic actuator according to this embodiment is used for rescue and other applications, and can pry open gaps in objects such as doors in buildings at accident sites with a tool tip. Figures 1 to 4 are diagrams showing the hydraulic actuator according to this embodiment. Of these, Figure 1 is a diagram showing the configuration of the hydraulic actuator according to this embodiment, and Figure 2 is a diagram showing the state when the tool tip of the hydraulic actuator shown in Figure 1 is in operation. Figure 3 is a circuit diagram of the hydraulic actuator shown in Figure 1, etc. Figure 4 is an enlarged diagram showing the pushing member and spool valve attached to the tip of the solenoid in the hydraulic actuator shown in Figure 1, etc. Figure 5 is a diagram showing the configuration of a conventional hydraulic actuator, and Figure 6 is a diagram showing the state when the tool tip of the hydraulic actuator shown in Figure 5 is in operation.

As shown in Figures 1 and 2, the hydraulic actuator of this embodiment includes a drive unit 10, a tool unit 40, a connection member 30 that connects the drive unit 10 and the tool unit 40, and a battery unit 60 for supplying power to the drive unit 10.

The drive unit 10 has a gripping part 12 that an operator can hold with one hand, a motor 14 such as an electric motor, a thin, rod-shaped rotating member 16 attached to the rotating shaft of the motor 14, a pressurized oil generating part 17 that generates pressurized oil when the rotating member 16 is rotated, and a drive switch 28 that is operated by the fingers of an operator holding the gripping part 12 in his or her hand.

The gripping portion 12 has a mounting portion 13 at its lower part. A battery 62 of a battery unit 60 (described later) is removably attached to the mounting portion 13. In addition to the battery 62, a dummy housing 68 of the battery unit 60 is also removably attached to the mounting portion 13. Figures 1 and 2 show the state when the dummy housing 68 is attached to the mounting portion 13.

In such a drive unit 10, when the drive switch 28 is operated by the fingers of an operator holding the grip portion 12, power is supplied from the battery 62 to the motor 14, and the motor 14 rotates the rotating member 16 attached to the motor 14.

As shown in FIG. 1, an oil chamber 20 is provided around the rotating member 16. The pressurized oil generating unit 17 has an eccentric member 18 attached to the tip of the rotating member 16 and a piston 19 that moves up and down as the eccentric member 18 rotates. The eccentric member 18 is eccentric with respect to the axis of the rotating member 16, and a bearing such as a needle roller bearing is attached to the outer circumferential surface of the eccentric member 18. The piston 19 is constantly pressed against the outer circumferential surface of the bearing by a spring (not shown). Therefore, when the rotating member 16 rotates, the eccentric member 18 and the bearing rotate eccentrically with respect to the axis of the rotating member 16, causing the piston 19 to move up and down, and pressurized oil is sent from the oil chamber 20 to the connecting member 30, and the pressurized oil is sent from the connecting member 30 to the tool unit 40, causing the tool 41 of the tool unit 40 to operate.

As shown in Figs. 1 and 2, the first oil passage 22 and the second oil passage 24 are provided in series inside the drive unit 10 to send pressurized oil from the oil chamber 20 to the connecting member 30. A spool valve 26 is disposed between the first oil passage 22 and the second oil passage 24. When no force is applied to the spool valve 26 from outside the drive unit 10, the piston 19 moves up and down when the rotating member 16 rotates, so that pressurized oil is sent from the oil chamber 20 to the connecting member 30 through the first oil passage 22 and the second oil passage 24. On the other hand, when a force is applied to the spool valve 26 from outside the drive unit 10 and the spool valve 26 is pushed into the drive unit 10, the first oil passage 22 and the second oil passage 24 are blocked by the outer peripheral surface of the spool valve 26, and the second oil passage 24 and the oil chamber 20 are connected by the space formed inside the spool valve 26. This allows oil to be returned from the tool unit 40 to the oil chamber 20 of the drive unit 10 via the connecting member 30. Details of this operation will be described later.

The connection member 30 is composed of, for example, a flexible hose 32. Specifically, the hose 32 is made of a flexible material that has the strength to withstand high pressure, and inside this hose 32, an oil passage is formed that supplies pressurized oil from the drive unit 10 to the tool unit 40 and returns oil from the tool unit 40 to the drive unit 10.

The tool unit 40 has a tool 41 that is operated by pressure oil generated by the pressure oil generating section 17 of the drive unit 10 and sent from the drive unit 10 to the tool unit 40 by the connection member 30, and a switch section 50. The tool 41 has a cylinder 42 to which a flange member 45 is attached at its upper end, a piston 43 that is housed inside the cylinder 42 and moves back and forth in the vertical direction in Figs. 1 and 2, a base member 44 attached to the tip of the piston 43 (the lower end in Figs. 1 and 2), and a spring 48 (see Fig. 2) provided inside the cylinder 42. As shown in Fig. 2, an oil chamber 46 is provided inside the cylinder 42, and this oil chamber 46 is connected to an oil passage formed inside the hose 32 of the connection member 30. When pressure oil is sent from the connection member 30 to the tool 41 (specifically, the oil chamber 46) of the tool unit 40, the pressure oil causes the piston 43 to move downward relative to the cylinder 42 in Fig. 2. This increases the distance between the flange member 45 attached to the top end of the cylinder 42 and the base member 44, making it possible to pry open gaps in objects such as doors in buildings at the accident site.

One end of a spring 48 provided inside the cylinder 42 is connected to the inner wall of the cylinder 42 facing the oil chamber 46, and the other end of the spring 48 is connected to the piston 43. The force of the spring 48 returning from its expanded state to its original state applies a force to the piston 43 in the direction of being accommodated inside the cylinder 42. That is, when the piston 43 moves relatively downward from the cylinder 42 as shown in FIG. 2, the spring 48 is in an expanded state, and the force of the spring 48 attempting to contract applies a force that moves the piston 43 upward in FIG. 2 toward the inside of the cylinder 42.

The switch unit 50 is attached to the tool 41, for example, by a number of screws. The switch unit 50 has a tool activation switch 52 and a pressurized oil generating unit activation switch 54. The tool activation switch 52 and the pressurized oil generating unit activation switch 54 are each buttons that are pressed by the operator's finger. The functions of the tool activation switch 52 and the pressurized oil generating unit activation switch 54 will be described in detail later.

The battery unit 60 has a battery 62 for supplying power to the drive unit 10, a battery adapter 64 to which the battery 62 is detachably attached, and a dummy housing 68 connected to the battery adapter 64 via a third cord 66. The battery 62 is composed of a secondary battery such as a lithium ion battery or a nickel-metal hydride battery. The third cord 66 is configured to transmit power between the battery adapter 64 and the dummy housing 68. When the dummy housing 68 is attached to the mounting portion 13 of the drive unit 10, it is capable of transmitting power sent from the third cord 66 to the motor 14.

As shown in FIG. 1 etc., a switching unit 70 is attached to the dummy housing 68, and a relay 72 is disposed inside the switching unit 70. A first connector 74 and a second connector 78 are detachably attached to the switching unit 70. One end of a first cord 76 is connected to the first connector 74, and the other end of the first cord 76 is connected to a return operation unit 80, which will be described later. One end of a second cord 56 is connected to the second connector 78, and the other end of the second cord 56 is connected to the tool operation switch 52 and the pressure oil generation unit operation switch 54 of the switch unit 50.

In the hydraulic actuator of this embodiment, the return operation unit 80 is detachably attached to the drive unit 10. Specifically, the return operation unit 80 is attached to the drive unit 10 by, for example, a plurality of screws. The return operation unit 80 starts the operation of returning the return oil from the tool 41 of the tool unit 40 to the oil chamber 20 of the drive unit 10 via the connection member 30. More specifically, the return operation unit 80 has a solenoid 82 and a pushing member 84 attached to the tip of the solenoid 82 and operated by the solenoid 82. When the solenoid 82 is not operating, the pushing member 84 is located at a position slightly away from the spool valve 26 of the drive unit 10 as shown in FIG. 4. On the other hand, when the solenoid 82 is operated, the pushing member 84 is pulled toward the solenoid 82, so that the pushing member 84 moves to the right in FIG. 4, and the spool valve 26 is pushed into the inside of the drive unit 10 by the pushing member 84. As a result, the first oil passage 22 and the second oil passage 24 are blocked by the outer circumferential surface of the spool valve 26, and the second oil passage 24 and the oil chamber 20 are connected by the space formed inside the spool valve 26. In addition, in the tool unit 40, the force of the spring 48 returning from the extended state to its original state applies a force to the piston 43 in the direction of being accommodated inside the cylinder 42. The force applied by the spring 48 moves the piston 43 upward in FIG. 2 toward the inside of the cylinder 42, and the oil chamber 46 formed between the inner wall of the cylinder 42 and the piston 43 becomes narrower, so that oil is returned from the oil chamber 46 of the tool unit 40 to the oil chamber 20 of the drive unit 10 via the connecting member 30.

Next, the circuit diagram of the hydraulic actuator will be described with reference to FIG. 3. As shown in FIG. 3, the tool actuation switch 52 is connected to the relay 72 and the first connector 74 of the switching unit 70 via the second connector 78, and is further connected to the solenoid 82 of the return operation unit 80 via the first connector 74. When the operator presses the tool actuation switch 52, the relay 72 of the switching unit 70 sends an actuation signal to the solenoid 82 of the return operation unit 80, and the solenoid 82 is actuated. As a result, the pushing member 84 is pulled toward the solenoid 82, and the pushing member 84 moves to the right in FIG. 4. The pushing member 84 pushes the spool valve 26 into the drive unit 10, and oil is returned from the oil chamber 46 of the tool unit 40 to the oil chamber 20 of the drive unit 10 via the connection member 30.

The pressure oil generating unit activation switch 54 is connected to the relay 72 of the switching unit 70 via the second connector 78, and this relay 72 is connected to the battery adapter 64. The battery adapter 64 is also connected to the battery 62 and to the motor 14. When the operator presses the pressure oil generating unit activation switch 54, the relay 72 of the switching unit 70 connects a path for sending power from the battery 62 to the motor 14, so that power is supplied from the battery 62 to the motor 14. Specifically, the relay 72 of the switching unit 70 connects a path for sending power from the battery 62 to the motor 14 via the battery adapter 64, the third cord 66, and the dummy housing 68. When power is supplied to the motor 14, the rotating member 16 rotates, causing the pressure oil generating unit 17 to generate pressure oil, and the generated pressure oil is supplied to the tool 41 of the tool unit 40 via the connecting member 30.

Next, we will explain the operation of the hydraulic actuator according to this embodiment.

When using the hydraulic actuator of this embodiment to pry open a gap in an object such as a door in a building at the scene of an accident, the worker first brings the hydraulic actuator to the scene. Then, if the space to work in at the scene is narrow, the worker holds the tool unit 40 of the hydraulic actuator and the tip of the connecting member 30 and places the tool 41 of the tool unit 40 in the work area. At this time, the drive unit 10 and the tool unit 40 may be far apart, but even in such cases, the hydraulic actuator of this embodiment allows the hydraulic actuator to be operated by a single worker.

More specifically, the operator inserts the tool 41 (specifically, the flange member 45 and the base member 44) into the gap between the target objects and presses the pressure oil generating unit activation switch 54 of the switch unit 50. When the operator presses the pressure oil generating unit activation switch 54, as described above, the relay 72 of the switching unit 70 connects a path for sending power from the battery 62 to the motor 14 via the battery adapter 64, the third cord 66, and the dummy housing 68. This allows power to be supplied from the battery 62 to the motor 14. Then, the motor 14 rotates the rotating member 16, causing the pressure oil generating unit 17 to generate pressure oil, which is supplied to the tool 41 of the tool unit 40 via the connecting member 30. Then, when pressure oil is sent to the tool 41 (specifically, the oil chamber 46), the piston 43 moves downward relative to the cylinder 42 in FIG. 2 due to this pressure oil. This increases the distance between the flange member 45 attached to the top end of the cylinder 42 and the base member 44, making it possible to pry open gaps in objects such as doors in buildings at the accident site. Also, when the worker releases the pressurized oil generating unit activation switch 54, power is no longer supplied to the motor 14, causing the rotating member 16 to stop and pressurized oil to no longer be generated by the pressurized oil generating unit 17. As a result, no more pressurized oil is sent to the oil chamber 46 of the tool 41, causing the piston 43 to stop.

When the work of prying open the gap of the object is completed, the worker removes the tool unit 40 of the hydraulic actuator from the gap of the object and presses the tool operation switch 52 of the switch unit 50. When the worker presses the tool operation switch 52, the solenoid 82 of the return operation unit 80 is operated by the relay 72 of the switching unit 70. As a result, the pushing member 84 is pulled toward the solenoid 82 side, and the pushing member 84 moves to the right in FIG. 4, and the spool valve 26 is pushed into the inside of the drive unit 10 by this pushing member 84, so that oil is returned from the oil chamber 46 of the tool unit 40 to the oil chamber 20 of the drive unit 10 via the connection member 30. Then, the force of the spring 48 provided inside the cylinder 42 returning from the expanded state to its original state gives the piston 43 a force in the direction of being accommodated inside the cylinder 42. The force of the spring 48 trying to contract gives the piston 43 a force to move upward in FIG. 2 toward the inside of the cylinder 42. In this way, the piston 43 is housed in the cylinder 42, and the tool unit 40 returns to the initial state shown in FIG. 1.

The configuration of a conventional hydraulic actuator will be described with reference to Figures 5 and 6. Figure 5 is a diagram showing the configuration of a conventional hydraulic actuator, and Figure 6 is a diagram showing the state when the end tool of the hydraulic actuator shown in Figure 5 is in operation. In describing the configuration of the conventional hydraulic actuator as shown in Figures 5 and 6, the same components as those of the hydraulic actuator of this embodiment as shown in Figures 1 to 4 are given the same reference numerals and their description will be omitted.

Compared to the hydraulic actuator of the present embodiment shown in Figs. 1 to 4, the conventional hydraulic actuator shown in Figs. 5 and 6 has a battery 62a itself detachably attached to the mounting portion 13 of the drive unit 10, instead of the dummy housing 68 of the battery unit 60. The battery 62a has substantially the same configuration as the battery 62 of the battery unit 60. The switch unit 50 is not provided in the tool unit 40. The return operation unit 80 is not provided in the drive unit 10, and instead an operating lever 90 is provided in the drive unit 10. When an operator who holds the grip portion 12 of the drive unit 10 operates the operating lever 90, the spool valve 26 is pushed into the inside of the drive unit 10, and oil is returned from the oil chamber 46 of the tool unit 40 to the oil chamber 20 of the drive unit 10 via the connecting member 30.

The operation of such a conventional hydraulic actuator will be explained below.

When using a conventional hydraulic actuator to pry open a gap in an object such as a door in a building at the scene of an accident, a worker first brings the hydraulic actuator to the scene. Specifically, when the work area at the scene is narrow, a first worker holds the tool unit 40 of the hydraulic actuator and the tip of the connecting member 30, and places the tool 41 of the tool unit 40 in the work area. At this time, the drive unit 10 and the tool unit 40 may be far apart, making it necessary for two workers to operate the hydraulic actuator.

Specifically, the first worker inserts the tool 41 (specifically, the flange member 45 and the base member 44) into the gap of the object. After the first worker inserts the tool 41 into the gap of the object, the second worker holding the gripping portion 12 of the drive unit 10 presses the drive switch 28, and power is supplied from the battery 62a to the motor 14. This causes the pressurized oil generating portion 17 to generate pressurized oil, which is supplied to the tool 41 of the tool unit 40 via the connecting member 30. When the pressurized oil is sent to the tool 41 (specifically, the oil chamber 46), the piston 43 moves downward relative to the cylinder 42 in FIG. 6 by this pressurized oil. This increases the distance between the flange member 45 attached to the upper end of the cylinder 42 and the base member 44, making it possible to pry open the gap of the object, such as a door in a building at the accident site. Furthermore, when the second operator releases the drive switch 28, power is no longer supplied to the motor 14, causing the rotating member 16 to stop and the pressurized oil generator 17 to stop generating pressurized oil. As a result, no more pressurized oil is sent to the oil chamber 46 of the tool 41, causing the piston 43 to stop. At this time, if the first operator inserting the tool 41 of the tool unit 40 into the gap in the object and the second operator operating the drive unit 10 are apart, there is a risk that they will not be able to communicate well with each other, and the operation of prying open the gap in the object may not be performed smoothly.

When the work of prying open the gap of the object is completed, the first worker removes the tool unit 40 of the hydraulic actuator from the gap of the object. Then, after the first worker removes the tool unit 40 of the hydraulic actuator from the gap of the object, the second worker operates the operating lever 90 of the drive unit 10. As a result, the spool valve 26 is pushed into the inside of the drive unit 10, and oil is returned from the oil chamber 46 of the tool unit 40 to the oil chamber 20 of the drive unit 10 via the connecting member 30. Then, the force of the spring 48 provided inside the cylinder 42 returning from the expanded state to its original state gives the piston 43 a force in the direction of being accommodated inside the cylinder 42. The force of the spring 48 trying to contract gives the piston 43 a force to move upward in FIG. 6 toward the inside of the cylinder 42. In this way, the piston 43 is accommodated in the cylinder 42, and the tool unit 40 returns to the initial state shown in FIG. 5.

As described above, conventional hydraulic actuators require two workers to operate them, and if there is poor communication between the person operating the tool 41 in the tool unit 40 and the person operating the drive unit 10, there is a risk that the work will not be performed properly.

In contrast, according to the hydraulic actuator of this embodiment, the drive unit 10 having the pressure oil generating unit 17 that generates pressure oil and the tool unit 40 having the tool 41 that operates with pressure oil are connected by a flexible connecting member 30. The tool unit 40 also has a switch unit 50, which has a tool operating switch 52 and a pressure oil generating unit operating switch 54. When the pressure oil generating unit operating switch 54 is operated, power is supplied from the battery 62 to the motor 14, causing the pressure oil generating unit 17 to generate pressure oil, and the generated pressure oil is supplied to the tool unit 40 by the connecting member 30, so that the tool 41 is operated. On the other hand, when the tool operating switch 52 is operated, the return operation unit 80 is operated, so that the return oil is returned from the tool 41 to the drive unit 10 via the connecting member 30, and the tool 41 returns to its initial state. In this way, the tool 41 can be operated by the switch unit 50 of the tool unit 40, so that even one operator can operate the tool 41, improving workability. This allows even a single worker to operate the tool 41 when the work area at the site is small and work needs to be done with the drive unit 10 and the tool unit 40 separated, thereby improving workability.

In addition, in this embodiment, the hydraulic actuator of the present embodiment as shown in FIGS. 1 to 4 can be obtained by simply attaching a switch unit 50 to the tool unit 40 of a conventional hydraulic actuator as shown in FIGS. 5 and 6, removing the operating lever 90 from the drive unit 10 and attaching the return operation unit 80 to the drive unit 10, removing the battery 62a from the mounting portion 13, and attaching a dummy housing 68 of the battery unit 60. In this way, the hydraulic actuator of the present embodiment can be obtained by only slightly modifying an existing hydraulic actuator, so the cost of realizing the hydraulic actuator of the present embodiment can be reduced.

In addition, in this embodiment, the battery 62 is not directly attached to the mounting portion 13 of the drive unit 10, but a dummy housing 68 of the battery unit 60 is attached. In this case, for example, when the drive unit 10 of the hydraulically operated device is stored in a dustproof device and brought to the site, by taking a part of the third cord 66 of the battery unit 60 and the battery 62 outside the dustproof device, even if the battery 62 runs out, the battery 62 can be replaced without removing the drive unit 10 from the dustproof device, which further improves workability for the worker.

The hydraulic actuator of this embodiment is not limited to the above-described configuration, and various modifications can be made.

For example, in the hydraulic actuator of this embodiment as shown in Figures 1 to 4, the installation of the drive switch 28 may be omitted. Even if the drive unit 10 is not provided with the drive switch 28, by operating the pressure oil generating unit activation switch 54 of the switch section 50, pressure oil can be generated by the pressure oil generating section 17 and sent to the tool unit 40 via the connection member 30.

In addition, in the hydraulic actuator described above, the switch unit 50 has a button-type tool activation switch 52 and a pressurized oil generating unit activation switch 54, but the hydraulic actuator of this embodiment is not limited to this form. In a hydraulic actuator according to a modified example, the switch unit may have one lever, and when the operator tilts this lever in a first direction, the tool activation switch is operated, and when the operator tilts this lever in a second direction opposite to the first direction, the pressurized oil generating unit activation switch is operated.

The tool 41 of the tool unit 40 is not limited to being composed of a cylinder 42 and a piston 43 as shown in FIG. 1 and other figures. In the hydraulic actuator of the modified example, the tool may have a cutter for cutting rebar, or a spreader with four functions of cutting, opening, crushing, and pulling. Even in this case, the tool is operated by supplying pressurized oil to the tool.

Furthermore, the switching unit 70 is not limited to being attached to the dummy housing 68. The switching unit 70 may be attached to, for example, the drive unit 10, instead of the dummy housing 68.

In addition, in the hydraulic actuator of this embodiment, the battery unit is not limited to having the battery 62, battery adapter 64, third cord 66, and dummy housing 68 as shown in Figures 1 and 2. The battery unit may have only the battery 62, and this battery 62 may be removably attached to the mounting portion 13 of the drive unit 10. Even in this case, the switching unit 70 may be attached to, for example, the drive unit 10, etc.

In addition, instead of the button-type tool activation switch 52 and pressure oil generating unit activation switch 54 being connected to the switching unit 70 by the second cord 56, when the tool activation switch 52 or pressure oil generating unit activation switch 54 is operated, a signal may be sent wirelessly to the relay 72 of the switching unit 70, and the switching operation may be performed by this relay 72.In addition, instead of the return operation unit 80 being connected to the switching unit 70 by the first cord 76, an activation signal may be sent wirelessly from the relay 72 to the solenoid 82.

10 Drive unit 12 Grip portion 13 Mounting portion 14 Motor 16 Rotating member 17 Pressurized oil generating portion 18 Eccentric member 19 Piston 20 Oil chamber 22 First oil passage 24 Second oil passage 26 Spool valve 28 Drive switch 30 Connection member 32 Hose 40 Tool unit 41 Tool 42 Cylinder 43 Piston 44 Base member 45 Flange member 46 Oil chamber 48 Spring 50 Switch portion 52 Tool operation switch 54 Pressurized oil generating portion operation switch 56 Second cord 60 Battery unit 62 Battery 62a Battery 64 Battery adapter 66 Third cord 68 Dummy housing 70 Switching portion 72 Relay 74 First connector 76 First cord 78 Second connector 80 Return operation portion 82 Solenoid 84 Pushing member 90 Operation lever

Claims (7)

a drive unit including a motor and a pressurized oil generating section that generates pressurized oil by rotating a rotating member by the motor;
a tool unit including a tool operated by pressure oil and a switch unit including a pressure oil generating unit activation switch and a tool activation switch;
a flexible connecting member that connects the tool unit and the drive unit, supplies the pressure oil generated by the pressure oil generating unit to the tool, and returns return oil from the tool to the pressure oil generating unit;
a battery unit having a battery for supplying power to the drive unit;
a return operation unit that can be attached to the drive unit and that starts an operation of returning return oil from the tool to the drive unit via the connection member;
A switching unit;
Equipped with
the battery unit further includes a battery adapter to which the battery is detachably attached, and a dummy housing connected to the battery adapter via a third cord;
the battery adapter and the dummy housing are each attachable to the drive unit;
When the pressurized oil generating unit activation switch is operated with the dummy housing attached to the drive unit, the switching unit connects a path for transmitting electric power from the battery to the motor via the battery adapter, the third cord, and the dummy housing, so that electric power is supplied from the battery to the motor, causing the pressurized oil generating unit to generate pressurized oil, and the generated pressurized oil is supplied to the tool unit by the connecting member.
A hydraulically operated device in which, when the tool operation switch is operated, the return operation portion is activated to return return oil from the tool via the connecting member to the drive unit. The return operation unit is connected to the switching unit via a first cord,
the pressure oil generating unit activation switch and the tool activation switch of the switch unit are connected to the switching unit by second cords,
When the pressure oil generating unit activation switch is operated, the switching unit connects a path for transmitting electric power from the battery to the motor, thereby supplying electric power from the battery to the motor,
2. The hydraulic actuator according to claim 1, wherein when the tool actuation switch is operated, the switching unit sends an actuation signal to the return action unit, thereby actuating the return action unit. The hydraulically operated device according to claim 1 or 2 , wherein the battery and the dummy housing are mountable at the same location on the drive unit. The hydraulically actuated device according to claim 1 , wherein the switch portion is detachably attachable to the tool. 5. The hydraulic actuator according to claim 1, wherein the drive unit is provided with a spool valve, and when the spool valve is not pushed into the drive unit, pressurized oil generated by the pressurized oil generating unit is sent to the connecting member, and when the spool valve is pushed into the drive unit, an oil passage for sending the pressurized oil generated by the pressurized oil generating unit to the connecting member is blocked by the spool valve, and return oil is returned from the tool to the drive unit via the connecting member. 6. The hydraulic actuator according to claim 5, wherein the return action portion has a pushing member that pushes the spool valve, and when the tool activation switch is operated, the pushing member moves, thereby pushing the spool valve into the inside of the drive unit. 7. The hydraulic actuator according to claim 6 , wherein the return action portion further includes a solenoid, and when the tool actuation switch is operated, the solenoid moves the pushing member.

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