Patent ID: 7748472

Claim:
A hammer drill comprising: a housing; a tool holder rotatably and pivotally supported on the front side in the housing and capable of mounting a bit on a front end thereof; a strike mechanism provided on the back side of the tool holder in the housing to strike the bit; a motor arranged on a back side in the housing; an intermediate spindle pivotally supported in parallel with the tool holder in the housing and being transmitted rotation from an output spindle of the motor; a rotation transmission member rotatably provided on a front side on the intermediate spindle as a separated body from the intermediate spindle and transmitting the rotation of the intermediate spindle toward the tool holder side by rotating; a strike transmission member rotatably provided on the back side on the intermediate spindle as a separated body from the intermediate spindle, converting the rotation of the intermediate spindle to a front and back movement by rotating, and transmitting the movement to the strike mechanism; a clutch member provided between the rotation transmission member and the strike transmission member, being integrally rotatable with the intermediate spindle, and slidable fore and aft; an operation member to slide the clutch member so as to engage with and disengage from at least one of the rotation transmission member and the strike transmission member by operating from an external of the housing; elastic means to elastically engage the clutch member with the rotation transmission member and/or the strike transmission member when the clutch member is slid; and wherein the elastic means comprises a guide member being provided in parallel with the intermediate spindle, at least one interlock member being provided on the guide member and integrally slidable by engaging with the clutch member, and an elastic member energizing the interlock member along the guide member.