DISMANTLEBLE INSTRUMENT UNIT PARTICULARLY FOR THE INSTRUMENTS WITH THE CYLINDER SHANK E.G.DRILLERS

摘要

Tool holder for use with machine tools, the tool holder having two aligned cylindrical bores of different diameters, separated by a circumferential groove, which is in communication with a hole through the body of the tool holder through which hydraulic fluid can be supplied. The cylindrical shank of the tool has correspondingly two cylindrical surfaces of different diameters with conical shoulders, one of which is in the end of the shank, while the other connects the cylindrical surfaces. The relaxed diameters of both stepped holes in the tool holder are smaller than the diameters of both cylindrical surfaces of the cylindrical shaft of the tool, the tool shank being press fitted into the tool holder. The advantages of the sectional tool unit according to the present invention are that the need of fastening elements is eliminated, while the mounting surfaces of the tool shank and the tool holder are very effectively engaged and can be machined with a high precision which determines the precision of the tool unit as a whole.