Abstract: A vibration isolation system having at least three vibration isolation units. Each of the units preferably has the same general configuration. The isolation units each include a support stand having three (3) adjustable feet for adjustably supporting and leveling the isolation units on the floor of the site of operation of the precision equipment desired to be isolated. The units further include a fluid tight cylinder. The fluid tight cylinder is connected to the support stand via three uniformly spaced rods in such a fashion that allows horizontal movement of the cylinder relative to the support stand. A fluid is disposed in a chamber formed intermediate the fluid tight cylinder and the support stand thereby providing a thin film viscous shear damper for damping excitations having a horizontal component. The fluid tight cylinder is sealed by a diaphragm. A piston is positioned directly above the diaphragm. A pair of stops limit the upward and downward movement of the piston.

Abstract: A vibration isolation system having at least three vibration isolation units. Each of the units preferably has the same general configuration. The isolation units each include a support stand having three (3) adjustable feet for adjustably supporting and leveling the isolation units on the floor of the site of operation of the precision equipment desired to be isolated. The units further include a fluid tight cylinder. The fluid tight cylinder is connected to the support stand via three uniformly spaced rods in such a fashion that allows horizontal movement of the cylinder relative to the support stand. A fluid is disposed in a chamber formed intermediate the fluid tight cylinder and the support stand thereby providing a thin film viscous shear damper for damping excitations having a horizontal component. The fluid tight cylinder is sealed by a diaphragm. A piston is positioned directly above the diaphragm. A pair of stops limit the upward and downward movement of the piston.