Patent ID: 7896097

Claim:
An electric power tool comprising: a switching member provided on a housing of the electric power tool for manipulation; a driving member, which is connected to the switching member to be turned in a predetermined angle, having a first driving portion and a second driving portion on a side, the first driving portion and the second driving portion of the driving member having teeth on two concentric circles; a first driven member having a driven portion, the driven portion of the first driven member having circular teeth directly engaged with the first driving portion of the driving member that a turn of the driving member moves the first driven member; a second driven member having a driven portion, the driven portion of the second driven member having circular teeth directly engaged with the second driving portion of the driving member that a turn of the driving member moves the second driven member; an impact mechanism having an impact member for reciprocation, wherein the first driven member is located behind the impact member; and a hammer mechanism having a first teeth ring and a second teeth ring, wherein the first teeth ring is provided on the second driven member, and the second teeth ring is connected to a spindle of the electric power tool; wherein the switching member is switchable to an impact mode, a hammer mode, and a drill mode, and when the switching member is switched to the impact mode, the driving member moves the first driven member away from the impact member to start the impact mechanism, and the driving member also move the second driven member to disengage the first teeth ring with the second teeth ring to shut the hammer mechanism; wherein when the switching member is switched to the hammer mode, the driving member moves the first driven member toward the impact member to shut the impact mechanism, and the driving member also move the second driven member to engage the first teeth ring with the second teeth ring to start the hammer mechanism; wherein when the switching member is switched to the drill mode, the driving member moves the first driven member toward the impact member to shut the impact mechanism, and the driving member also move the second driven member to disengage the first teeth ring with the second teeth ring to shut the hammer mechanism; and wherein the first driving portion and the second driving portion of the driving member have teeth on two concentric circles, and the driven portion of the first driven member and the second teeth member have circular teeth.