Patent ID: 6179530
Filing Date: 2001-01-30
Classification: B23B,Y10T

Abstract:
An expansion chuck for simultaneously chucking a tool shaft and a hollow tool part, the expansion chuck comprising:a solid chuck body which can be chucked in the working spindle of a machine tool, said chuck body having a central receptacle bore forming an inside peripheral wall in its chucking part to receive the tool shaft to be chucked, and an outside chucking face on an outside peripheral wall to hold the hollow tool part;an elongated toroidal chamber formed in the interior of said chucking part of said chuck body, said toroidal chamber being arranged coaxially with said receptacle bore and with said outside chucking face; andapparatus for generating a hydraulic internal pressure on said toroidal chamber so that said two peripheral walls undergo elastic deformation due to internal hydraulic pressure in said toroidal chamber acting radially toward the inside for chucking the tool shaft and radially toward the outside for chucking the hollow tool part.