Patent ID: 7416410

Claim:
Medical or dental medical handpiece having an elongate shaft, which has in a forward end region thereof a tool holder having a lateral insertion opening for a tool, and having a rearward shaft section and a forward shaft section which include an obtuse angle which is open to a side away from the insertion opening, in the shaft sections there being rotatably mounted in each case a drive shaft section, each of which stands in driving connection with one another by means of gears meshing with one another, and the forward shaft section standing in driving connection with the tool holder by means of gears meshing with one another, between the rearward drive shaft section and the forward drive shaft section there being arranged a middle drive shaft section, offset towards a side away from the insertion opening, a rearward gear of which meshes with a hollow gear crown of a forward gear of the rearward drive shaft section, the middle drive shaft being mounted in a roller bearing, a bearing bush disposed in the rearward shaft section, the bearing bush adapted to axially receive the roller bearing, and a securing device disposed on an inner surface of the bearing bush, the securing device positioning and securing the roller bearing within the bearing bush, the forward drive shaft section and the middle drive shaft section standing in driving connection with one another by means of pinion gears, wherein the pinion gears are in the form of spur or conical gears and the rearward gear of the forward drive shaft section, on its side away from the insertion opening, meshes with an associated gear of the middle drive shaft section, and the securing device comprises a securing ring.