Means for vertically moving a ram in a compression molding machi

Details Means for vertically moving a ram in a compression molding machi Means for vertically moving a ram in a compression molding machi

1990-06-29

1991-08-20

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Press forming apparatus having opposed press members

100269R, 425408, B30B 132

Patent

active

050409670

ABSTRACT:
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.

REFERENCES:
patent: 3677685 (1972-07-01), Aoki
patent: 3924986 (1975-12-01), Suler
patent: 4130384 (1978-12-01), MacMillan
patent: 4269259 (1981-05-01), Ueno et al.
patent: 4380427 (1983-04-01), Hehl
patent: 4588539 (1986-05-01), Rossi et al.
patent: 4861259 (1989-08-01), Takada

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