Handpiece dental or surgical use with locking mechanism.

摘要

Handpiece for dental or surgical use, comprising: a hollow (11) shaft rotatable about a longitudinal axis and mounted by bearings in a fixed tubular shell (16); a clamp (10) mounted on a front end of the hollow shaft having a central channel (19) for receiving the tail (3) of a removable tool, and the gripper comprises two arranged axial arms around the axis and each provided with a jaw (20) in the central channel; a locking mechanism (17) supported by the hollow (11) shaft and arranged to exert a centripetal force on a supporting surface (46) of each clamp arm for securing the tail of the tool between the clamp jaws; and loosening mechanism (18) supported at least partly by the fixed bushing (16) and arranged to act on the locking mechanism (17) at least to release the clamp; and said mechanism loosening comprises a sliding ring (52) disposed on the fixed sleeve (16) and actuated by a manual control device (6) so that it can axially displace the slide ring (52) to entrain the sliding sleeve ( 40) of the locking mechanism to release the clamp (10); characterized in that the locking mechanism (17) comprises a sliding sleeve (40) mounted on the hollow shaft and for each arm of the clamp has a transmission element (45) disposed within a radial shaft hole gap (11) between said support surface (46) of the arm and a inner cam surface of the sliding sleeve (40).