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 having a housing (12) in which a collet (14) is disposed that has at least one clamping lever (16, 18) that can be elastically deflected and extends along the axis (A) of a tool shank to be clamped and designed and arranged such that the tool shank can be clamped using the clamping lever (16, 18) and a push-button mechanism (28, 30) moveably disposed in the housing (12) is provided with a pressing piece (28) that acts in an axial direction on the clamping levers (16, 18) of the collet (14), wherein the tool shank to be clamped is guided and aligned in the housing (12) with the aid of first and second guide surfaces (14b, 22a;

• 26a) that are spaced apart from one another along the axis (A) and that are fixedly disposed with respect to the housing (12), wherein the second guide surface (26a) is formed by an inner circumferential surface of a supporting ring (26) that is fixedly connected to the housing (12), characterized in that
• the supporting ring (26) is fixed in an opening (20) in the housing (12) and simultaneously disposed in an opening (34) in a pressing piece (28) of the push-button mechanism, wherein the opening (34) in the pressing piece (28) is larger in size in the direction of the axis (A) than the axial effective length of the supporting ring (26), so that the pressing piece (28) can move axially with respect to the supporting ring (26).