Patent ID: 8511399

Claim:
A hammer drill comprising: a body 2 having at least one support handle 4 ; an electric motor mounted within the body 2 ; an electric switch 22 , capable of being switched on and off by a trigger button 8 connected to it, to activate or deactivate respectively the electric motor, wherein the trigger button 8 is moveable between two positions, a first position where the electric switch 22 is off and a second position where the electric switch 22 is on; a locking arm 38 moveably mounted on the electric switch 22 which, when the trigger button 8 is located in its second position, is moveable between two positions, a first position where it is disengaged from the trigger button 8 and a second position where it engages with the trigger button 8 and holds the trigger button 8 in its second position; and wherein the locking arm is held in the locking arm first position and prevented from moving to the locking arm second position when the trigger button is located in the trigger button first position.