RAM piston with internal reservoir and check valve

Details RAM piston with internal reservoir and check valve RAM piston with internal reservoir and check valve

1990-06-29

1991-08-13

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91422, 91440, 91441, 92113, 92142, F15B 1108, F15B 1304

Patent

active

050386697

ABSTRACT:
A double-cylinder construction which can be used not only in large-sized compression molding machines but also in small-sized or medium-sized compression molding machines. In the double-cylinder construction of the present invention, a ram slidably fitted within an outer cylinder is provided in the center thereof with a hollow part. A rod slidably fitted in said hollow part is fixed to the bottom of said outer cylinder without penetrating said bottom thereof, and said rod does not contain an oil passage within. The double-cylinder construction always contains a certain amount of oil within and this self-contained oil is moved back and forth within the double-cylinder construction when the ram is being moved up and down. Therefore, the amount of oil supplied to the double-cylinder construction from outside is very small.

REFERENCES:
patent: 2539361 (1951-01-01), Cannon
patent: 3084512 (1963-04-01), Huelskamp
patent: 3710689 (1973-01-01), Henderson
patent: 4361075 (1982-11-01), Block

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