HAMMER DRILL WITH SEPARATE AND INTERCONNECTABLE DRIVE MEANS

摘要

A hammer drill includes a first unit for supplying impact force to a tool inserted in such a hammer drill and a second unit for supplying rotational force to such a tool. A first drive motor drives the impact force unit and a second drive motor drives the rotational force unit. The motors can be operated independently of one another. A first drive train interconnects the first drive motor to the impact force unit and a second drive train interconnects the second drive motor and the rotational force unit. A coupling device interconnects the first and second drive trains so that at least one of the impact force unit and the rotational force unit can be selectively driven by both the first and second drive motors.