DRILL CHUCK

摘要

PURPOSE: To obtain a long durable life and to at the same time obtain an excellent tightening characteristic for a tool having a tightening shaft made of hard metal or a proper material of high hardness, by forming a tightening jaw with higher wear resistance as compared with hardened steel at least partially on a tightening surface. CONSTITUTION: Base substance 1 provided so as to fix to a spindle 5 or similar ones supports radially adjustable tightening jaws 6 guided by a jaw supporting body 9. Each of these tightening jaws 6 has at least a tightening surface 18 engaged to a shaft of a tool to be tightened. Further, an adjusting member for tightening jaws 6 are supported on the base substance 1. These tightening jaws 6 are constituted with higher wear resistance as compared with hardened steel at least partially on the tightening surface 18.