HOLDER Russian patent published in 1999 - IPC

FIELD: mechanical engineering; holders for electric and air operated drills; tools which do not require wrench for tightening up and releasing and can be tightened and released manually or by means of drive motor. SUBSTANCE: holder has nut installed for rotation on holder base with engagement with thread of holder clamping cams. Holder has antifriction bearing as separate unit arranged between nut and pressure ring, and mainly cylindrical sleeve connected for rotation with nut and covering front part of holder base to provide movement of clamping cams when front sleeve rotates relative to base. Holder has decorative cap made of stainless material. EFFECT: minimum number of parts required for assembling, provision of minimum radial and axial impact in operation. 29 cl, 2 dwg