Air bearing for a dental handpiece

摘要

This invention relates to a driving mechanism of an air bearing journaled handpiece for dental treatment, the mechanism being improved in that even when a load contrary to the direction of rotation of a tool shaft such as cutting of the teeth acts upon the tool shaft in a dental operation, rotation of the tool shaft does not stop because of load resistance but enables the heretofore, unmaterialized medium-speed cutting (hereinafter referred to as "extension to medium-speed rotation") and makes it possible to obtain improved torque during high-speed rotation in addition to the extension to medium-speed rotation.