Shaft for transfer of torque or impact force for hammer drill has open channel provided with widened contour leading to hammer surface

摘要

The shaft (100) has an open channel at its end, with a widened contour (140) at one or both side edges of the open end of the channel, leading to the hammer surface (150) of the shaft and providing an insertion aid. The open channel has a square, rectangular, or trapezoidal cross-section. An Independent claim for a manufacturing method for a tool shaft is also included.