Motors: expansible chamber type – With motive fluid valve – Contracting chamber exhaust valve controlled by expanding...
Patent
1974-04-09
1976-11-02
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Contracting chamber exhaust valve controlled by expanding...
91 46, 91471, 92 80, 92106, 92156, F01B 3110, F15B 13042, F15B 2104
Patent
active
039889696
ABSTRACT:
A rotary hydraulic jack having two jack compartments, comprising a rotary hydraulic joint for the supply of hydraulic liquid to and the evacuation of hydraulic liquid from at least one of the compartments. The hydraulic joint comprises a fixed, hollow cylindrical part and a rotary part supported by bearings with a narrow annular gap between itself and the fixed part. A passageway leads to said compartment and has a portion in each of the fixed and rotary parts, the passageway portion in the rotary part being equipped with at least one non-return device for hydraulic liquid supplied to said compartment. A groove is provided in at least one of the fixed and rotary parts and communicates with the passageway portions in the fixed and rotary parts. Means is provided for supplying gas under pressure to the annular gap betwen the fixed and rotary parts for the purpose of expelling residual oil from the gap after the supply of hydraulic liquid under pressure to said compartment via the passageway has been completed.
REFERENCES:
patent: 2318638 (1943-05-01), Scott
patent: 2835227 (1958-05-01), Gamet
patent: 3020057 (1962-02-01), Gamet
patent: 3090544 (1963-05-01), Woollenweber, Jr. et al.
patent: 3380350 (1968-04-01), Stewart
patent: 3439925 (1969-04-01), Sampson
patent: 3570510 (1971-03-01), Tsutsumi
patent: 3748968 (1973-07-01), Pinto
Cohen Irwin C.
Flocks Karl W.
La Precision Industrielle
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