HYDROPNEUMATIC FEEDDEVICES

摘要

A hydropneumatic feed device which includes a pneumatic cylinder; a hydraulic cylinder slidable in and constituting a piston for the pneumatic cylinder; a working member movable with the hydraulic cylinder; an arrangement for admitting pneumatic fluid to and exhausting it from the pneumatic cylinder to move the hydraulic cylinder through working and return strokes and thereby advance and retract the working member; a piston in the hydraulic cylinder; and an arrangement for controlling the flow of hydraulic fluid from one side of the last-mentioned piston to the other to regulate the rate of movement of the hydraulic cylinder during its forward and return strokes.