Concentricity-optimized tool clamping system for dental angled handpieces and dental turbines

A clamping device for clamping a dental tool in a dental turbine handpiece comprising:

• a housing in which a collet is disposed, the collet having at least two clamping levers that can be elastically deflected and extend along the axis (A) of a tool shank to be clamped, the clamping levers are designed and arranged for clamping the tool shank,
• a push-button mechanism moveably disposed in the housing and provided with a pressing piece that acts in an axial direction on the clamping levers of the collet, wherein the tool shank to be clamped is guided and aligned in the housing with the aid of first and second guide surfaces that are spaced apart from one another along the axis (A) and that are fixedly disposed with respect to the housing, wherein the collet defines a sleeve-shaped section that forms the first guide surface for the tool shank,
• a supporting ring fixedly disposed in the housing, having a sleeve-like shape, and forming second guide surfaces that are disposed opposite each other on the inner circumference of the supporting ring,
• the push-button mechanism comprising a press button and the pressing piece having spreading elements with sloped spreading surfaces that act in an axial direction on the clamping levers of the collet,
• wherein the pressing piece of the push-button mechanism is moveably disposed in the supporting ring, and wherein the spreading elements are guided through the supporting ring and come to lie in the space between the clamping levers.