For tool run-optimized dental angle handpieces and dental turbines

摘要

The invention relates to a clamping device for clamping a dental tool in a dental turbine handpiece with a housing, in which a collet chuck is arranged, the at least has a clamping lever that can be elastically deflected and to extend along the axis of the tool shaft extends. The tensioning lever is designed and arranged so that the tool shaft by means of tensioning lever can be clamped, wherein the tool shank, with the aid of spaced apart from one another along the axis of the first and second guide surfaces in the housing is guided and aligned, wherein the second guide surface by an inner circumferential surface of a supporting ring is formed, which is firmly connected to the housing and a push-button mechanism arranged displaceable in the housing is provided with a thrust piece in the axial direction on the tensioning lever of the collet chuck acts. According to the invention, the supporting ring is fastened in an opening of the housing and at the same time in an opening of the thrust piece is arranged, whereby the opening of the thrust piece in the direction of the axis has a larger dimension than the axially effective length of the support ring, so that the thrust piece relative to the support ring being axially movable.