Combined pneumatic-hydraulic press head with high actuation spee

Details Combined pneumatic-hydraulic press head with high actuation spee Combined pneumatic-hydraulic press head with high actuation spee

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

052478718

ABSTRACT:
The combined pneumatic-hydraulic press head includes a body inside which a substantially cylindrical main chamber is defined; the chamber accommodates a main piston and a secondary piston so that they can slide along an axial direction. The main piston has a stem which protrudes from an axial end of the main chamber, and the secondary piston is spaced from the main piston on the side opposite to the stem. The two pistons sealingly divide the main chamber into three chambers: two end chambers, which can be connected to a source of compressed air or to the atmosphere in order to move the two pistons along the axis of the main chamber during the approach of the main stem or spacing motion with respect to the part to be treated, and an intermediate chamber which contains a liquid. An actuation stem is furthermore accommodated in the main chamber and sealingly passes through the secondary piston. A partition is arranged in the intermediate chamber, is rigidly fixed to the walls of the main chamber and is crossed by a passage for the actuation stem. The press is actuated by pushing the actuation stem through the passage toward the main piston so as to increase the pressure in the region of the intermediate chamber which is located between the main piston and the partition.

REFERENCES:
patent: 3059433 (1962-10-01), Hirsch
patent: 3266415 (1966-08-01), Palmer
patent: 3875365 (1975-04-01), Beneteau
patent: 4072013 (1978-02-01), Barbareschi
patent: 4288987 (1981-09-01), Grullmeier
patent: 4300351 (1981-11-01), Grullmeier
patent: 4422294 (1983-12-01), Klein
patent: 4961317 (1990-10-01), Wolfbauer

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