Patent ID: 7987920

Claim:
A hammer-drill comprising: a housing having a motor including an output member; an output spindle journaled in the housing to permit axial reciprocating movement thereof in a hammer mode; a parallel axis transmission disposed in the housing and drivingly coupling the output member of the motor to the output spindle, the transmission including at least two speed modes; a rotating hammer member that rotates with the output spindle and a non-rotating hammer member that does not rotate with the output spindle, the rotating hammer member cooperating with the non-rotating hammer member to cause axial reciprocating movement of the output spindle in the hammer mode; and a mode collar rotatably mounted on the housing and around the output spindle; a rearward cam surface facing axially toward the rear of the hammer drill coupled to the mode collar and rotating along with the mode collar during movement of the mode collar into one of the at least two speed modes; and a forward cam surface facing axially toward the front of the hammer drill coupled to the mode collar and rotating along with the mode collar during movement of the mode collar into the hammer mode.