Hydraulic actuation device

A hydraulic actuation device comprising:

• a tool;
• an actuation part having a pressure oil supply mechanism configured to send a pressure oil from an oil chamber to the tool and return a return oil from the tool to the oil chamber;
• an operation handle for adjusting oil passages for the pressure oil and the return oil in the pressure oil supply mechanism, the operation handle being configured to be able to be moved from an initial position;
• a biaser configured to bias the operation handle toward the initial position when no external force is applied to the operation handle;
• and
• a pair of reciprocators, wherein
• when the operation handle moves from the initial position, the tool is actuated by the actuation part,
• when the operation handle is returned to the initial position by the biaser, operation of the tool by the actuation part is stopped,
• the tool has a tool member, a division member configured to divide an internal space in which the pressure oil is stored, into an advance oil chamber and a retraction oil chamber, and a piston member attached to the division member and configured to move the tool member,
• when the operation handle moves from the initial position, the pressure oil is sent by the actuation part from the oil chamber to the advance oil chamber or the retraction oil chamber of the tool, whereby the division member and the piston member move, and at this time, the return oil is returned from the retraction oil chamber or the advance oil chamber to the oil chamber,
• the operation handle is configured to be able to be rotated in a first rotation direction and a second rotation direction opposite to the first rotation direction, from the initial position,
• when the operation handle rotates in the first rotation direction from the initial position, the tool member of the tool moves in a first direction by the actuation part,
• when the operation handle rotates in the second rotation direction from the initial position, the tool member of the tool moves in a second direction opposite to the first direction, by the actuation part,
• the reciprocators are configured to be moved in directions opposite to each other from the neutral position when the operation handle is rotated,
• the pressure oil supply mechanism has a pair of flow passage adjustment valves corresponding to the pair of reciprocators, and the oil passage for the pressure oil from the oil chamber to the tool and the oil passage for the return oil from the tool to the oil chamber are adjusted by the flow passage adjustment valves,
• when the reciprocators are moved in the directions opposite to each other from the neutral position by rotation of the operation handle in the first rotation direction from the initial position, the oil passage for the pressure oil leads from the oil chamber to the advance oil chamber of the tool and the oil passage for the return oil leads from the retraction oil chamber of the tool to the oil chamber, whereby the division member and the piston member move in a first direction, and
• when the reciprocators are moved in the directions opposite to each other from the neutral position by rotation of the operation handle in the second rotation direction from the initial position, the oil passage for the pressure oil leads from the oil chamber to the retraction oil chamber of the tool and the oil passage for the return oil leads from the advance oil chamber of the tool to the oil chamber, whereby the division member and the piston member move in a second direction opposite to the first direction.