Patent ID: 6834574
Filing Date: 2004-12-28
Classification: F15B,G01D

Abstract:
In a fluid-pressure actuated piston/cylinder assembly including a sensor, capable of reading indicia markings, for sensing the movement of a piston and a cylinder relative to each other, a piston rod, having at least one indicia marking on its surface, attached to said piston, said piston/cylinder assembly having at least one open end, a sealing gland incorporated into said at least one open end and with said piston rod operatively and sealingly extending axially through a longitudinal through bore in said sealing gland, wherein said improvement comprises:said sensor being housed within said sealing gland for sensing said at least one indicia marking during said movement in order to determine the specific location of the piston rod and cylinder relative each other; and said sealing gland including a plurality of seals for isolating said sensor from both a pressurized chamber within said cylinder and from contaminants outside of the piston/cylinder assembly.