| 摘要 |
An extensible cylinder and piston unit for supporting a vertically moving platform carrying a delivery device and feeding thereto a fluid under pressure from an underlying stationary tank, which comprises a double effect hydraulic extensible cylinder and piston unit supporting the platform moving vertically relative to a stationary base such as a hole in the ground, adapted to receive said platform carrying a device for delivering a fluid under pressure, said unit being both the platform operating member and a member for feeding a fluid under pressure from a stationary tank to said platform. |
