Device for Transmitting Torque from a Drill to a Drill Bit

A device (10) for transmitting a torque which is produced by a drill (11) to a drill bit (12), comprising:

• a shank (14) having a first outer conical region (33), a groove portion (34), a second outer conical region (35), and a plurality of first longitudinal grooves (37) extending over the first outer conical region (33), the groove portion (34), and the second outer conical region (35) and having a plurality of second longitudinal grooves (38) extending over the second outer conical region (35), wherein a number of the plurality of first longitudinal grooves (37) is identical to a number of the plurality of second longitudinal grooves (38);
• and
• a tool fitting (13) which has a basic body (41), an intermediate element (42), and a locking device (43);
• wherein the intermediate element (42) has a plurality of first inner rotary drivers (64) with a first width (B1) and first depth (T1), a plurality of second inner rotary drivers (65) with a second width (B2) and second depth (T2), and a plurality of first outer rotary drivers (66) with a third width (B3) and third depth (T3);
• wherein the basic body (41) has an inner conical region (48) and a rotary driving region (49) with first outer rotary driving grooves (53), wherein, in a connected state of the tool fitting (13), the first outer rotary drivers (66) of the intermediate element (42) engage in the first outer rotary driving grooves (53);
• wherein the locking device (43) is adjustable parallel to a longitudinal axis (22) of the tool fitting (13) between a receiving position and a locking position and wherein the shank (14) is insertable into the tool fitting (13) in the receiving position and is connected to the tool fitting (13) in the locking position;
• wherein, in a connected state of the device (10), the first inner rotary drivers (64) of the intermediate element (42) engage in the first longitudinal grooves (37) of the shank (14) and the second inner rotary drivers (65) of the intermediate element (42) engage in the second longitudinal grooves (38) of the shank (14);
• wherein the intermediate element (42) has a plurality of second outer rotary drivers (67) with a fourth width (B4) and fourth depth (T4) and the rotary driving region (49) has a plurality of second outer rotary driving grooves (54), wherein, in the connected state of the device (10), the second outer rotary drivers (67) engage in the second outer rotary driving grooves (54).