Patent ID: 6681908
Filing Date: 2004-01-27
Classification: F16F

Abstract:
A tunable mass damper comprising:a sealed chamber comprising a first wall and a second wall, the first wall comprising a threaded bore, the threads of the bore having a pitch, wherein the sealed chamber isolates a damping fluid within the sealed chamber from an ambient environment outside the sealed chamber; a mass that slides in the sealed chamber between the first wall and the second wall, the mass comprising a first end facing the first wall of the chamber; a cylindrical coiled spring located between the first wall of the chamber and the first end of the mass, the cylindrical coiled spring attached to the first end of the mass and axially aligned with the bore of the first wall, the cylindrical coiled spring comprising coils, the coils of the cylindrical coiled spring having the same pitch as the threads of the threaded bore in the first wall; and a cylindrical screw comprising threads, the threads having the same pitch as the cylindrical coils of the cylindrical coiled spring and the threads of the bore, the cylindrical screw threaded through the threads in the first wall and threaded inside the coils of the cylindrical coiled spring, the threads of the screw adjustably engaging the coils of the cylindrical coiled spring.