Patent ID: 7717192

Claim:
A hammer-drill comprising: a housing having a motor including an output member; a rotary-reciprocatory output spindle journaled in the housing; a transmission disposed in the housing and driven by the output member, the transmission being operable to rotate the output spindle at a first low speed or at a second high speed; a rotatably fixed hammer member and a rotatable hammer member each mounted around the output spindle, the movable hammer member cooperating with the fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode; and a mode collar rotatably mounted on the housing and around the output spindle, the mode collar being movable between a plurality of positions, each position corresponding to a mode of operation, wherein the modes of operation comprise: a low speed mode wherein the output spindle is driven in the low speed; a high speed mode wherein the output spindle is driven in the high speed; and the hammer-drilling mode, wherein in the hammer-drilling mode the output spindle is driven in the high speed mode.