| 摘要 |
A hydraulic tool (10) having a body (11), a frame (12) in which a stationary tool (13) for machining a workpiece and a movable tool (14) are disposed, a cylindrical piston (2) for moving the movable tool (14), and a rapid-advance piston (4) that is connected to the body (11), wherein the rapid-advance piston (4) has a barrel part (4a) that is disposed in contact with the inner circumferential surface of the piston (2) in a slidable manner, a connection part (4b) that is disposed at the rear end (4g) of the barrel part (4a) and connected to the body (11), a screw part (4d) that is formed in the connection part (4b), and a D-cut face (4h) that is formed on the barrel part (4a). A fixation member (6) that is disposed in the body (11) so as to be positioned in the vicinity of the D- cut face (4h) is also provided. The D-cut face (4h) is formed along a direction orthogonal to a line that connects the center point (o) of the barrel part (4a) to the center point (d) of the fixation member (6), and the rapid-advance piston (4) is prevented from rotating by the fixation member (6). Consequently, the durability is improved. |
