Device for transmitting torque from a drill to a drill bit

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

• a shank (14) having a first outer conical region (33), a groove region (34), a second outer conical region (35), and longitudinal grooves (37, 38) extending parallel to a longitudinal axis (24) of the shank (14);
• 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) is annular designed with an inner lateral surface (62) on which inner rotary drivers (64, 65) are arranged, an outer lateral surface (63) on which outer rotary drivers (66, 67) are arranged, and a base surface (61) connecting the inner lateral surface (62) and outer lateral surface (63);
• wherein the basic body (41) has an inner conical region (48) and a rotary driving region (49) with an annular collar (51) and an annular shoulder (52) and wherein outer rotary driving grooves (53, 54) are arranged in the annular collar (51);
• 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 inner rotary drivers (64, 65) of the intermediate element (42) engage in the longitudinal grooves (37, 38) of the shank (14) and the outer rotary drivers (66, 67) of the intermediate element (42) engage in the outer rotary driving grooves (53, 54) of the annular collar (51);
• wherein lower rotary drivers (71, 72) are arranged on the base surface (61) of the intermediate element (42) and lower rotary driving grooves (55, 56) are arranged in the annular shoulder (52) and wherein, in a connected state of the basic body (41) and the intermediate element (42), the lower rotary drivers (71, 72) interact with the lower rotary driving grooves (55, 56).