Rotary hydraulic jack device
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United States of America Patent
Stats
-
Feb 10, 1981
Grant Date -
N/A
app pub date -
Jun 30, 1978
filing date -
Jul 4, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a rotary hydraulic jack device. This jack device comprises a rotary hydraulic joint whose rotary part is formed by a tubular extension of a first end cover of the jack cylinder. Two check valves and the rotary joint are respectively inserted in two main pipes which alternately connect the two compartments of the jack cylinder to a source of pressurized hydraulic fluid and to a tank at atmospheric pressure. Each check valve is controlled by an auxiliary pipe connected to one of the main pipes upstream of the other check valve. The two check valves are respectively located in tight chambers arranged in the first end cover of the jack cylinder. This jack device may be used to control the part of clamping chuck of a machine tool.
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