Device for transmitting torque from a drill to a drill bit
AssigneeHilti Aktiengesellschaft
InventorFlorian Goetz
Life of this patent
Estimating the term…
Abstract
A device for transmitting a torque from a drill to a drill bit includes a shank and a tool fitting. The shank has a first outer conical region, a groove region, and a second outer conical region and has first longitudinal grooves and second longitudinal grooves. The tool fitting has a basic body which has first outer rotary driving grooves, an intermediate element which has first inner rotary drivers, second inner rotary drivers, and first outer rotary drivers, and has a locking device. In the connected state, the first inner rotary drivers engage in the first longitudinal grooves, the second inner rotary drivers engage in the second longitudinal grooves, and the first outer rotary drivers engage in the first outer rotary driving grooves.
Claims13
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), and a second outer conical region (35) and having a plurality of first longitudinal grooves (37) extending over the first outer conical region (33), the groove region (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 a first depth (T1), a plurality of second inner rotary drivers (65) with a second width (B2) and a second depth (T2), and a plurality of first outer rotary drivers (66) with a third width (B3) and a third depth (T3);
- wherein the basic body (41) has an inner conical region (48) and a rotary driving region (49) with a plurality of first outer rotary driving grooves (53) and 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 first depth (T1) of the first inner rotary drivers (64) and the second depth (T2) of the second inner rotary drivers (65) are identical and wherein the second longitudinal grooves (38) of the shank (14) also extend over the first outer conical region (33) and the groove region (34).
Dependencies are inferred from the claim text.