Crank press with hydraulic transmission

Details Crank press with hydraulic transmission Crank press with hydraulic transmission

1980-01-15

1982-09-21

Cohen, Irwin C.

Presses

Reciprocating press construction

Fluid pressure actuation

60389, 60442, 60444, 60456, B30B 126, B30B 1516

Patent

active

043500919

ABSTRACT:
In a crank press having a pedestal and a rotatable crank shaft journaled thereon and connected to a reciprocal top platen guidably mounted on the pedestal to form work pieces, the improvement which comprises a hydraulic motor mounted on the pedestal having a reversible drive shaft connected to the crank shaft, and a hydraulic transmission connected to the hydraulic motor. The transmission includes a pump assembly connected to a reservoir for delivering the pressure fluid selectively under the control of a servo directional valve in a closed hydraulic loop to the hydraulic motor for selective forward and reverse drive together with a safety control to automatically neutralize the pump assembly and control automatic braking of the hydraulic motor drive shaft.

REFERENCES:
patent: 2280190 (1942-04-01), Ernst
patent: 2316497 (1943-04-01), Woodhouse et al.
patent: 2366272 (1945-01-01), Le Tourneau
patent: 2736499 (1956-02-01), Hazen
patent: 3680311 (1972-08-01), Harbonn et al.
patent: 3750406 (1973-08-01), Verlinde et al.
patent: 3901031 (1975-08-01), Knapp et al.
patent: 3999387 (1976-12-01), Knopf

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