| 摘要 |
An apparatus for vertically moving a ram in a compression molding machine having a ram slidably fitted within an outer cylinder. The ram has a hollow portion which includes an oil reservoir. A piston is slidably fitted within this hollow portion. A source of air pressure is connected to a space between the piston and the top of the hollow portion. As air pressure is applied, the piston will move so as to displace oil from the hollow portion. A pilot check valve is positioned in the ram so as to pass oil into an area between the ram and the outer cylinder.
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