The clamping device is provided for tools and has a coupling piece that is provided with at least one actuating unit. The coupling piece acts to actuate a nut seated on a spindle journal that is receiving the tool. A torque coupling is provided for the nut. The coupling piece is fixedly connected with an output shaft that is in drive connection with a drive shaft by a transmission gear. As a result of the transmission gear, it is possible to rotate the drive shaft with minimal moment in order to apply the great clamping force required for axial clamping of the tool.

A router includes a housing and a motor assembly disposed within the housing. The motor assembly includes a driven shaft having a cavity on a first end of the driven shaft. The router includes a collet that is configured to mate into the cavity of the driven shaft with the collet being configured to grip a shank of a router bit. The router includes a gear mechanism that is configured to couple and decouple from a second end of the driven shaft such that a rotation of the gear mechanism when the gear mechanism is coupled to the second end of the driven shaft causes at least one of tightening and loosening of the collet.

An electric drill includes an electric motor, having a stator and a rotor, disposed in a housing; a driver circuit including multiple switches disposed on a current path from a battery pack to the electric motor; a controller configured to switch on and off the multiple switches to adjust power supply from the battery pack to the electric motor; an output shaft for mounting a working head; and a transmission mechanism connected between the rotor and the output shaft. The transmission mechanism is a two-stage deceleration mechanism and includes a first-stage deceleration mechanism and a second-stage deceleration mechanism. The electric motor drives the working head to rotate via the transmission mechanism and the output shaft and the maximum rotational speed of the working head is greater than or equal to 2800 rpm.