Patent ID: 8087651

Claim:
Coupling device for coupling tools in a tool machine comprising a first circular shaped coupling part provided with at least one projecting region and a second circular shaped coupling part provided with a plurality of spaced apart elastic regions, wherein the at least one projecting region of the first coupling part which projects in a z direction is arranged either centrally or eccentrically, and the at least one projecting region has a conical outer surface ( 2 , 2 ′) formed with at least one angle relative to the z direction, wherein the at least one projecting region of the first coupling part engages in the elastic regions of the second coupling part for an x-y orientation in the z direction, wherein the second coupling part is of one-piece design, and wherein the second coupling part is of annular design with a circular inner opening, wherein the elastic regions of the second coupling part are formed in a radial manner and point radially into the inner opening, and wherein the elastic regions are of undercut tongue-shaped design in the form of circular sector sections each comprising a pair of elastic lateral regions defining a circular marginal region, the elastic regions are free to move in the z direction relative to the coupling part, wherein the coupling device is configured for optimum rigidity, loading capacity, force distribution and a low overall height and wherein the elastic regions in the direction of the centre of the second coupling part increase the strength and loading capacity of the coupling device, and further wherein said angle of said at least one projecting region angles inwardly towards a longitudinal axis of the at least one projecting region such that the at least one projecting region and the elastic regions do not lock and are free to move in the z direction when engaged.