An oscillatory handpiece for a tool bit includes a housing having therewith fluid driven turbine rotor having an eccentric connection to an oscillatable rod which is effectively supported only at the point of its eccentric connection. The handpiece also includes means in the housing along the length...http://www.google.se/patents/US4484893?utm_source=gb-gplus-sharePatent US4484893 - Air turbine handpiece for dental scaling and other applications
