Patent ID: 8967928
Filing Date: 2015-03-03
Classification: B23B,Y10T

Abstract:
1. An interface between a first tool element and a second tool element comprising: a projection on one of the first and second tool elements; and a cavity on the other of the first and second tool elements accommodating the projection; wherein the cavity has an inner contour designed for polygonal and/or stellate projections, the inner contour, looked upon from the inside, comprising two first regions, each first region having first concave sections and second concave sections, the first concave sections having radius of curvature that is different than radius of curvature of the second concave section the inner contour comprising two second regions, each second region having at least a concave first section and at least an adjoining convex second section, and that the two first regions and the two second regions are opposite of each other.