Table shift apparatus for large hydraulic presses

Details Table shift apparatus for large hydraulic presses Table shift apparatus for large hydraulic presses

1987-03-31

1988-01-19

Spruill, Robert L.

Metal deforming

With means to drive tool

With means to permit tool positioning

100918, 100229R, 100224, 83563, B30B 1506, B21J 1308

Patent

active

047197900

ABSTRACT:
A table shift apparatus for large hydraulic presses employs two sets of cylinders for moving the working table of the press back and forth along a given path. To prevent ram buckling as would occur if rams or pistons were operated in compression, a first group of cylinders operated in tension only is provided for pulling the table in one direction while a second group of cylinders disposed at the other end of the path and also operated in tension is used for pulling the table back. While one group of cylinders is pulling the table the other group may assist the pulling operation by pushing the table as long as the applied hydraulic pressure is controlled to prevent buckling of its rams under all circumstances.

REFERENCES:
patent: 2940384 (1960-06-01), Munschaver et al.
patent: 3273490 (1966-09-01), Beard
patent: 3831427 (1974-08-01), Lee
patent: 3878773 (1975-04-01), Smit
patent: 3935811 (1976-02-01), Lenz et al.
patent: 3942431 (1976-03-01), Goff

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