Supports – Resilient support – Including additional energy absorbing means – e.g. – fluid or...
Patent
1997-01-29
1999-12-14
Ramirez, Ramon O.
Supports
Resilient support
Including additional energy absorbing means, e.g., fluid or...
248566, 248636, 248638, F16M 100
Patent
active
060006714
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. A variable stiffener is positioned intermediate the lower stop and the piston to variably introduce the horizontal damper. The variable stiffener includes an annular elastomeric member having a circular cross-section. A thin film viscous shear damper is positioned in the fluid tight cylinder for damping excitation in the vertical direction. This damper includes a conically shaped plunger operably associated with a tapered well or cup. At least a portion of the plunger and cup are immersed in a liquid. The vertical damper is connected to the piston via a variable stiffener such that the vertical damper may be completely disconnected from the piston during the measuring stage to thereby avoid the transmission of any vertically oriented vibrations from the floor or otherwise, to the precision instrument. A support plate is connected to the piston for supporting at least a portion of the load of the precision machine. The isolation unit also includes a leveling valve for maintaining the precision machine level.
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Advanced Isolation Systems, Ltd.
Ramirez Ramon O.
Wentsler Stephen S.
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