Combined pneumatic-hydraulic press with controlled stroke

Details Combined pneumatic-hydraulic press with controlled stroke Combined pneumatic-hydraulic press with controlled stroke

1992-02-20

1993-09-28

Denion, Thomas E.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

With means for selectively changing the speed or force...

91520, 60560, 60565, 60593, F15B 1100

Patent

active

052478700

ABSTRACT:
The combined pneumatic-hydraulic press with controlled stroke, includes a body inside which a substantially cylindrical main chamber is defined; the main chamber accommodates, so that it can slide along an axial direction, a working piston which protrudes from the body with its stem. The working piston delimits, in the main chamber, a first compartment which contains a liquid and is connected, through a passage, to a secondary chamber which is provided with elements for exerting pressure on the liquid contained in the secondary chamber in order to transfer at least part of the liquid from the secondary chamber to the first compartment in order to axially move the working piston. Cutoff elements are provided on the passage and can be controllably activated in order to hydraulically isolate the first compartment from the secondary chamber, and there is an actuation piston which is provided with a stem which can be sealingly inserted in the first compartment in order to increase the hydraulic pressure inside the first compartment, with an increase in the actuation force which acts on the working piston parallel to its axis. The press furthermore comprises elements for delimiting the stroke of the working piston.

REFERENCES:
patent: 3059433 (1962-10-01), Hirsch
patent: 3958493 (1976-05-01), Fujita et al.
patent: 4072013 (1978-02-01), Barbareschi
patent: 4288987 (1981-09-01), Grullmeier
patent: 4300351 (1981-11-01), Grullmeier
patent: 4961317 (1990-10-01), Wolfbauer

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