| 摘要 |
A shank of a rotary-percussion working tool ( 2 ) has at least two, diametrically opposite locking grooves ( 5 a , 5 b) each having a locking shoulder ( 11 ) at an axial locking end ( 3 ) and spaced from a free end surface ( 4 ) of the shank ( 1 ), and an end shoulder ( 12 ) axially spaced from the locking shoulder ( 11 ) in a direction of a working tool-side end of the shank ( 1 ) and spaced from the axial locking end ( 3 ) of the shank ( 1 ) by a length (L) amounting at least to three times of a guide diameter (D) of the shank ( 1 ), and at least two entraining grooves ( 6 a , 6 b) mutually tangentially offset with respect to the locking grooves ( 5 a , 5 b), opening toward the free end surface ( 4 ), and having a tangential groove width (B) and at least one tangential, force application surface ( 7 ) extending over a contact length (K).
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