| 摘要 |
PURPOSE:To prevent a seizuring accident or sticking in the titled machine by composing a coupling part to supply working oil from a supporting prt to a rotary cylinder of a double check valve built-in type quick coupling simultaneously coupled with the rotary cylinder. CONSTITUTION:When the diameter of a drum segment 2 is to be extended, pressure oil is applied to the coupling B part through a support 14. The pressure oil is made flow into a cylinder room H in the rotary cylinder 3 through a flow pass G provided to penetrate into a drum shaft 7. A piston 8 is pressed in the right direction by the pressure oil flowing into the room 11, a shaft 7 is moved in the same direction and the segment is opened by a wedge driving part 2A. At the time, the pressure oil in a cylinder room I of the cylinder 3 is returned to the oil pressure source from the support 14 through another flow pass F in the pipe 28. In order to reduce the segment 2, the pressure oil is supplied from the flow pass D to F by a switching valve attached to the external pipe of the support to make the pressure oil flow into the room I of the cylinder 3. |
