公开(公告)号：US20230364686A1

公开(公告)日：2023-11-16

申请号：US18030157

申请日：2021-08-05

申请人： NT TOOL CORPORATION

发明人： Makoto SAITO

IPC分类号： B23B31/117

CPC分类号： B23B31/1176

摘要： A tool holder (100) for holding a tool (200) has pressurizing chambers (123a, 123b) provided between a body member inner peripheral surface (111) of a body member (110) and a sleeve outer peripheral surface (122) of a sleeve (120). Grip parts (124a, 124b) are provided between the sleeve outer peripheral surface and a sleeve inner peripheral surface (121) and are elastically deformed radially inward when pressure in the pressurizing chambers is increased. An extended chamber (123d) is defined between the sleeve outer peripheral surface and the body member inner peripheral surface, fluidly communicates with the pressurizing chamber and extends in an axial direction and in a circumferential direction. The extended chamber curtails radially inward elastic deformation of a portion of the body member inner peripheral surface, which corresponds to one of the grip parts, when a pressing force is received on a body member outer peripheral surface (112).