Tensioning nut assembly of a medical hand-held drill or milling machine

摘要

The keyless chuck assembly has a manually or automatically activated and deactivated free-wheel that is arranged between a drive shaft (1) and a chuck housing. The clamping jaws (6), particularly three clamping jaws, are provided in the chuck housing, where the jaws are axially displaced by a pressure spindle (4). The free-wheel is rotated by the drive shaft in the activated state relative to the chuck housing. A manually or automatically operated clutch is arranged between the free-wheel and the chuck housing or between the free-wheel and the drive shaft.