Patent ID: 7308950

Claim:
A hand held electrically powered drilling and/or hammering tool, having a tool housing and comprising: a spindle mounted within the housing and operatively connectable to a tool bit, the spindle having a longitudinal axis; a balanced motor sub-assembly mounted within the housing and comprising a motor, a commutator, a radial fan, and an armature shaft having axis, the fan having a plurality of blades and connected to the armature shaft proximate to a first end of the motor and with the blades facing away from the motor, the axis of the armature shaft angled with respect to the longitudinal axis of the spindle and the first end of the motor is closest to the longitudinal axis of the spindle; an air inlet located in the housing so as to communicate with the fan and an air outlet located in the housing proximate to a second end of the motor opposite to the first end so as to communicate through the motor with the fan; and arranged so that in use of the tool the fan rotates proximate the first end of the motor to draw air into the air inlet and to push air through the motor and out of the air outlet proximate to the second end of the motor, and the commutator is located proximate to the second end of the motor, and the second end of the motor is remote from the longitudinal axis of the spindle.