Apparatus for controlling the movement of a reciprocatory hydrau

Details Apparatus for controlling the movement of a reciprocatory hydrau Apparatus for controlling the movement of a reciprocatory hydrau

1981-04-24

1983-08-09

Crosby, Gene

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

7245318, B21J 912

Patent

active

043971750

ABSTRACT:
A system is provided for two speed movement of a hydraulically driven element. The system includes a housing for a primary piston having a longitudinal bore open at one end. A secondary piston is received within the open bore end to define a secondary expandable reservoir within the primary piston. The primary piston includes a secondary working face disposed within the secondary expandable reservoir and a primary working face disposed in a primary expandable reservoir. High pressure hydraulic fluid is introduced into the secondary expandable reservoir for high speed movement. When the primary piston reaches a predetermined location, high pressure hydraulic fluid is introduced into both reservoirs for low speed movement.

REFERENCES:
patent: 2220798 (1940-11-01), Dinzl
patent: 2937606 (1960-05-01), Paulton
patent: 3290919 (1966-12-01), Malinak
patent: 3792644 (1974-02-01), Ferguson
patent: 4197757 (1980-04-01), Hackett
patent: 4341106 (1982-07-01), Hackett

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