Patent ID: 7758289
Filing Date: 2010-07-20
Classification: B23B,B23P,Y10T

Abstract:
1. A tool holder for a rotary tool, comprising: a) a mounting section for holding a shaft of the rotary tool centrally relative to an axis of rotation of the tool holder; b) a diameter compensation bush held detachably in a mounting opening of the mounting section for bridging a diameter difference between an internal diameter of the mounting opening and an external diameter of the shaft, wherein the diameter compensation bush includes two sleeves arranged coaxially one inside another, of which an external sleeve has a cylindrical external surface and a conical inner surface and of which an inner sleeve has a conical external surface bearing against the conical inner surface of the external sleeve and a cylindrical inner surface having an internal diameter that can be changed for diameter compensation by axial displacement of the inner sleeve and the external sleeve relative to one another down to a diameter allowing bearing of the inner surface of the inner sleeve against the external surface of the shaft; and c) clamping means provided on the mounting section, which define the mounting opening and are radially adjustable between a radially widened release position for inserting or removing the diameter compensation bush and a clamping position, in which the clamping means exert radial press-fit forces on the diameter compensation bush, wherein the external diameter of the external sleeve is smaller than the internal diameter of the mounting opening in the release position of the clamping means so that the diameter compensation bush in the release position of the clamping means can be inserted into the mounting opening or removed therefrom, wherein the diameter compensation bush transmits to the inner sleeve the radial press-fit forces, which are exerted in the clamped position on the external sleeve, for press-fit holding of the shaft on the mounting section.