Patent ID: 6467592
Filing Date: 2002-10-22
Classification: F15B,F16F

Abstract:
An arrangement for a piston and cylinder device, comprising:a cylinder unit having an inner space defined therein, the inner space having a flowable medium disposed therein; a slidable piston unit disposed in the inner space, the piston unit being movable in a forward and backward direction, the piston unit dividing the inner space into a first chamber and a second chamber; a piston rod, connected to the piston unit; the piston rod having a recess defined therein, the piston rod having a first opening being in fluid communication with the first chamber; the cylinder unit having an end wall, the end wall having at least a part of a cylinder channel defined therein; a hollow sensor element disposed in the inner space and attached to the end wall, the sensor element having an axial sensor channel defined therein and extending therethrough, the sensor element being slidably associated with the piston unit and extending through the piston unit and into the recess of the piston rod, the sensor channel having a top end opening in fluid communication with the first opening and the first chamber and a bottom end opening in fluid communication with one end of the cylinder channel, the cylinder channel having an opposite end in fluid communication with the second chamber so that the medium is permitted to flow between the first and second chambers via the sensor channel and the cylinder channel; a conductive member disposed in the sensor element, the conductive member being connected to an electric unit for detecting an inductance; and a control valve in operative engagement with the cylinder channel for controlling the flow of fluid through the cylinder channel.