CHUCK FOR ROTARY TOOL FOR DRILL, TAP OR THE LIKE

摘要

PROBLEM TO BE SOLVED: To provide a chuck for rotary tool for a drill, a tap or the like to perform the efficient feed of a lubricant. SOLUTION: A chuck for a rotary tool 11 is provided with a chuck bushing 20 received in a machine tool. The bushing comprises a central internal part receptacle 21 releasably inserting the bush 30 for a tool therein; a central main guide port 22 for a coolant and a lubricant supported by a groove in the direction of length at the outside of the tool; and a shaft hole 31 through which the bush is inserted in the shaft 12 of the tool throughout an overall length and in which the bush is received and held. A groove 32 formed on the inside of the shaft hole is axially extended throughout the overall length of the bush and communicated at one end with the central main guide port of the chuck bushing and axially released at the other end.