Abstract: An electric hammer drill including a vacuum dust collecting device for collecting dust from an area of an article being drilled by a drill bit wherein a hose extending from a body of the hammer drill is directly connected to an end of a movable first pipe which is slidably received in a stationary second pipe. A fan for transporting the dust by vacuum is fixed on a shaft extending across a dust collecting chamber in the body. The shaft is coaxial with, and releasably coupled with, an armature shaft of a motor. With this releasable coupling, the armature shaft is relatively short and unlikely to bend or flex, so that vibration produced during a drilling operation is small. During the drilling operation, the first pipe slides back and forth along the second pipe as a suction hood moves in a direction opposite to the direction of movement of the drill bit.

Abstract: At least two vibration proof elements are interposed between a tool body and the handle thereof. Each of the elements has a first supporting member connected to the handle, and two rubber blocks interposed between the first and second supporting members so that the element functions as a shock absorber. The first supporting member is partially received in the second supporting member in such a manner that the first supporting member is reciprocally movable with respect to the second supporting member when a force is applied to the element in a longitudinal direction of the tool body. Each of the first and second supporting members has a U-shaped portion so that the inner surface of the second supporting member abuts the outer surface of the first supporting member thus preventing the handle from excessively rotating about an axis perpendicular to the longitudinal axis, and passing through the elements.