Pretension ring for pretensioning jaws of triple jaw chuck - has coaxial outer and inner faces each with surface sections of continuously changing radius over angular ranges of 120 deg. relative to axis of symmetry

摘要

The tension ring (1) has an outer face and an inner face arranged coaxial relative to the axis of symmetry. Each face has, over an angular range of 120 deg., relative to this axis, several surface sections which change continuously in radius. The surface sections of the inner face run over the angular range from a first smaller inner radius to a second larger inner radius. The surface sections of the outer face run over the angular range from a first smaller outer radius to a second larger outer radius. The larger inner radius is smaller than the smaller outer radius.