Shank for a rotary and/or percussion working tool

A shank of a working tool (2) that at least one of rotates about an axis (A) and is blow-driven at least partially along the axis (A), the shank (1) extending along the axis (A) with a maximal guide diameter (D) and comprising at least two, arranged opposite each other, locking grooves (5a, 5b) each having a locking shoulder (11) provided 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 at least one of the locking grooves (5a, 5b) by a length (L) amounting at least to three times of the guide diameter (D);

• and at least two entraining grooves (6a, 6b) mutually tangentially offset with respect to the locking grooves (5a, 5b) and opening toward the free end surface (4), the at least two entraining grooves (6a, 6b) having a tangential groove width (B) and at least one tangential, force application surface (7) extending over a contact length (K);
• wherein an axial guide length (F) between a working tool-side guide end (13) with the guide diameter (D) and the end shoulder (12) of both locking grooves (5a, 5b) is smaller than 1.5 times of the guide diameter (D).

A shank of a working tool (2) that at least one of rotates about an axis (A) and is blow-driven at least partially along the axis (A), the shank (1) extending along the axis (A) with a maximal guide diameter (D) and comprising at least two, arranged opposite each other, locking grooves (5a, 5b) each having a locking shoulder (11) provided 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 at least one of the locking grooves (5a, 5b) by a length (L) amounting at least to three times of the guide diameter (D);

• and at least two entraining grooves (6a, 6b) mutually tangentially offset with respect to the locking grooves (5a, 5b) and opening toward the free end surface (4), the at least two entraining grooves (6a, 6b) having a tangential groove width (B) and at least one tangential, force application surface (7) extending over a contact length (K);
• wherein the end shoulder (12) of each of the locking grooves (5a, 5b) is formed by the working tool-side end shoulder of a respective further locking groove (5c, 5d) axially spaced, in the direction toward the working tool-side end of the shank (1), from the respective locking groove (5a, 5b) and separated therefrom.