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

1979-11-02

1982-07-27

Crosby, Gene P.

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

72264, B21C 2308, B21C 2700, F16B 1508

Patent

active

043411061

ABSTRACT:
A method and apparatus are provided for controlling the movement of a reciprocatory hydraulically driven element of a metal forming machine between extended and retracted positions. Two piston members, having different sized working areas are slidably mounted in two reservoirs which are in communication with one another at a location other than their respective inlets. The system provides fast and slow movement of the element utilizing a single source of pressurized hydraulic fluid.

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"The Extrusion of Metals" by Pearson & Parkins, 2nd Edition, (1960), pp. 320 & 321.

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