Motors: expansible chamber type – With signal – indicator or inspection means
Patent
1978-06-30
1981-02-10
Cohen, Irwin C.
Motors: expansible chamber type
With signal, indicator or inspection means
91420, 92 86, 92106, F01B 3112, F15B 13042
Patent
active
042494516
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.
REFERENCES:
patent: 2219488 (1940-10-01), Parker
patent: 3595264 (1971-07-01), Martin
patent: 3608431 (1971-09-01), Pease, III
patent: 3748968 (1973-07-01), Pinto
patent: 3799032 (1974-03-01), Honeycutt
patent: 3855902 (1974-12-01), Kirst
patent: 3892165 (1975-07-01), Lioux
patent: 3972537 (1976-08-01), McClelland
patent: 3986437 (1976-10-01), Lioux
patent: 4080716 (1978-03-01), Dorp
Cohen Irwin C.
La Precision Industrielle
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