| 摘要 |
A tool shaft, especially for drills of the percussive type, such as hammer drills, is adapted to be mounted in a tool holder having fixed driving elements, and the shaft is therefore provided with guiding recesses driving recesses and interconnecting transition recesses which recesses in combination with the driving elements form a type of bayonet joint. In order to improve the universal applicability of the tool shaft also in connection with tool holders of the type having radially movable driving elements, the driving recesses are formed with a radial depth exceeding that of the guiding recesses, and each of the guiding recesses has a cross-sectional shape so as to define a rib or edge between each associated pair of guiding and driving recesses so as to prevent spherical or cylinder shaped driving elements of the radially movable type from being moved unintentionally from the driving recess into the associated guiding recess. |
