The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 1987
Filed:
Oct. 03, 1986
Michael J Rosen, Arlington, MA (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
Abstract
A hand control capable of suppressing tremors and other unwanted vibrations is disclosed which incorporates viscous damping in two degrees of freedom to mechanically filter the forces applied by the user's hand. To suppress pathological intention tremors, the damping characteristics are chosen so as to selectively reduce the amplitude of movements at or above about 3 Hertz. The hand control includes a chamber filled with a viscous fluid, a position-sensing actuator assembly and a damping element connected to the actuator and disposed within the chamber to suppress involuntary movements of the actuator. The volume of the chamber, size of the damping element and viscosity of the fluid are chosen to achieve a damping constant of about 2 to 20 lbf-sec/ft., preferably from about 5 to about 15 lbf-sec/ft. The viscous fluid is preferably a silicone oil having a viscosity of about 300,000 to about 900,000 cstokes.