CLAMPING CHUCK Russian patent published in 1995 - IPC

FIELD: machine tool building. SUBSTANCE: chuck has supporting sleeve 3 secured on spindle 4, composite casing 9 mounted on supporting sleeve 3 for axial displacements relative to drag bar end head 12 built into supporting sleeve 3. Composite casing 9 has parts 8 and 10 and intermediate flange 17 secured between parts 8 and 10 to divide casing 9 into two cavities 20 and 21. Part 8 of casing 9 carries unit 25 of clamping cams 24 movable in radial directions. Chuck has mechanism providing progressive axial motion of casing 9 and radial motion of clamping cams, which have stepped- diameter sleeve 23. Large step of sleeve 23 is disposed in cavity 20 and connected with radially movable cam unit and spring-loaded by springs 37 towards spindle. Small step 25 of sleeve 23 is inserted into cavity 21 and connected through bayonet mechanism with carriers 32 of hollow stem 31. Hydraulic cylinder moves stem 31 through tie-rod 29 attached in hollow stem 31 by means of threaded sleeve 30. EFFECT: increased efficiency and enhanced reliability in operation. 2 cl, 3 dwg