DRILLING CHUCK HOLDER Russian patent published in 1998 - IPC

FIELD: machine tool manufacture. SUBSTANCE: drilling tool holder has two conical shanks. Main shank 2 is connected with spindle of lathe and auxiliary shank 3 is coupled with chuck 1. Conical opening 4 is made in main shank end adjacent to point where chuck 1 is attached and thread 5 is cut in outer surface of main shank 2. Auxiliary conical shank 3 has flange 6 and conical depression 7 in flange end. Conical split sleeve 8 has trapezium-shaped slot 10 disposed in larger base adjacent to recess 9 and aligned with conical depression 7 of flange 6 through ball 11. Holder has captive nut 12, back nut 13 and spring washer 14. Split conical sleeve 8 is provided with trapezium-shaped slot and depression in diametrically opposed relation to recess 9. EFFECT: increased efficiency, provision for precise drilling of openings and enhanced reliability in operation. 2 cl, 2 dwg