| 摘要 |
A contra-angle tool holder head notably for dental drills and cutters, for rotatably driving in opposite directions two coaxial dental tools such as drills or cutters comprises a first holding member adapted to drive the first tool and consisting of a claw supporting a first bevel pinion and a second holding member for rotatably driving the second tool in the opposite direction, this second holding member consisting of a second hollow bevel pinion, both holding members being driven simultaneously from a third bevel pinion carried by a shaft driven in turn from the motor and disposed between the first and second bevel pinions, the axis of the drive being disposed at right angles to the common axis of the first and second bevel pinions and of their holding members. |
