Patent ID: 9481042
Filing Date: 2016-11-01
CPC Classification: B23C,Y10T

Claim Text:
1. A ring-shaped tool for processing a work piece, comprising: a fastening area for fastening onto a rotatable drive shaft, wherein the fastening area is centered with relation to the ring-shape of the tool; and a plurality of sprockets arranged around the circumference of the tool to form a ring in a first plane, the ring having an axis of rotation that defines an axial direction, wherein the plurality of sprockets are arranged on the head end of the tool and, when viewed from a direction perpendicular to the axial direction, each sprocket of the plurality of sprockets has an arc-shape the arc-shape having a summit that lies in the first plane, wherein the sprockets are formed in a mirror-symmetric manner relative to the first plane, and wherein, when viewed from the axial direction, each sprocket of the plurality of sprockets has a curvature in a radial direction; wherein the arc-shape comprises first and second circular arcs which merge into each other at a point of common tangent, the first circular arc forming the summit of the arc-shape and having a first radius of gyration and the second circular arc having a second radius of gyration, wherein the center of circle for the first radius of gyration is located closer to the axis than is the summit and wherein the center of circle for the second radius of gyration is located closer to the axis than is the center of the circle having the first radius of gyration, wherein the second radius of gyration is at least 14 times the first radius of gyration and is no greater than 17 times the first radius of gyration.