An electrical power tool, comprising:
- a motor-driven shaft means (200) for supporting a circular working tool (3);
- a motor (M) that drives the shaft means (200);
- tool locking means (31) for securing the circular working tool (3) on the shaft means (200) and having a locking position in which the circular working tool (3) is fixedly secured on the shaft means (200), and an unlocking position in which the circular working tool (3) can be removed from the shaft means (200);
- a switch (7) operably connected with the shaft-driving motor for turning the motor on and off;
- a braking device (10) for braking the shaft means (200) and having a braking position in which it brakes rotation of the shaft means (200), and a release position in which the shaft means (200) can freely rotate;
- a safety element (8) connected with the braking device (10) and cooperating with the switch (7), the safety element (8) having a safety position that corresponds to the braking position of the braking device (10), wherein the safety position is a position relative to the switch (7) in which the switch cannot turn-on the shaft-driving motor (M), the safety element (8) further having a release position that corresponds to the release position of the braking device (10), wherein the release position of the safety element (8) is a position relative to the switch (7) in which the switch (7) can turn-on the shaft-driving motor (M);
- a locking mechanism (21) connectable with the braking device (10) and the tool locking means (31) and displaceable between a locked position, in which the tool locking means (31) is in its unlocking position and the braking device (10) is in its braking position and in which the safety element (8) is retained in the safety position thereof, and an unlocked position, in which the tool locking means (31) is in its locking position and the braking device (10) is in its release position and in which the safety element (8) occupies the release position thereof;
- a locking lever (5) for actuating both the tool locking means (31) and the locking mechanism (21) and displaceable between a lever locking position that corresponds to the locking position of the tool locking means (31) and the unlocked position of the locking mechanism (21), and a lever release position that corresponds to the unlocking position of the tool locking means (31) and the locked position of the locking mechanism (21),
- whereby when the tool locking means (31) is in the unlocking position, the shaft means (200) is braked and the switch (7) is prevented from turning-on the shaft-driving motor, and when the tool locking means (31) is in the locking position, the shaft means (200) can freely rotate and the switch (7) can actuate the shaft-driving motor (M),
- wherein the braking device (10) includes a braking member for braking the shaft means in the braking position, the breaking device further including a groove (20) therein, and the locking mechanism (21) has a locking member (25) engaging in the groove (20) of the braking device (10) in the lever release position of the locking lever (5) for retaining the braking device (10) in the braking position thereof, the locking member being removed from within the groove (20) of the braking device (10) in the lever locking position.