FLUID ACTUATED CONTROL DEVICE

摘要

A device is described for the movement of a rod means into a plurality of positions along a linear path. It consists of an open-ended, longitudinally bored cylinder body containing a piston rod with a fixed piston and with a plurality of stops which limit the movement of two additional pistons slidable relative to the rod and in the bore. One of the additional pistons is limited in its travels by stop means in the bore and the other additional piston has the rod means operatively associated with it. Three fluid passage means have restrictors of a predetermined, fixed ratio of cross-sectional areas, and by selected release and pressurization of the fluid passage means according to a series of combinations in binary code, incremental stepping positions of the rod means are effected.