Patent ID: 7331496

Claim:
A hammer drill ( 2 ) for carrying out a pure drilling operation, a pure percussion operation, and a rotary-percussion operation, comprising: a clockwise and counterclockwise driven tool spindle ( 28 ); a drive pinion ( 70 ) operationally connectable with the tool spindle ( 28 ) for transmitting a torque thereto; a separate control handle ( 6 ) rotatable to different positions for selecting one of the pure drilling operation, the pure percussion operation, and the rotary-percussion operation; a switching device ( 8 ) adjustable in accordance with a position of the control handle ( 6 ) and shiftable by the control handle ( 6 ) in a clockwise rotation position for effecting a pure drilling operational in a clockwise direction and in a counterclockwise rotation position for effecting a pure drilling operation in a counterclockwise direction; and an eccentric member ( 30 ) for driving a percussion mechanism or the hammer drill ( 2 ), and a drive member ( 34 ) for driving the eccentric member ( 30 ), wherein the switching device ( 8 ) comprises coupling means ( 24 ) arranged between the eccentric member ( 30 ) and the drive member ( 34 ).