Patent ID: 8328599

Claim:
A direct motor-drive portable angle grinder, comprising: a handle ( 500 ); an electric motor ( 100 ) including a stator ( 205 ) and an internal rotor ( 200 ) mounted to rotate with a spindle ( 300 ), wherein a deflection angle between an axis of the spindle and an axis of a handle ( 500 ) is between 30° and 150°, and an inertial body ( 310 ) is installed on the rotor ( 200 ) or the spindle ( 300 ) provide a high speed, high inertia drive for facilitating grinding, polishing, or cutting operations by a grinding wheel ( 800 ) or circular saw coaxially installed with the spindle or the rotor; a housing ( 400 ) within which the motor stator is installed and from which the handle extends; a manually operated electromechanical device ( 212 ) for providing at least one of the manual control functions: manually turning the motor on and off and changing a speed of the motor; and a guard ( 410 ) installed adjacent the handle on one side of the rotor ( 200 ) and the grinding wheel or circular saw wherein the housing ( 400 ) is at least partially open to provide an outward heat dissipation.