Patent ID: 6684964
Filing Date: 2004-02-03
Classification: B25D

Abstract:
A hammer drill adapter, comprising:a housing; a drive shaft supported by bearings within the housing for rotation relative to the housing and the drive shaft having an axis; a first set of rotating bearing elements supported within the housing and fixed in motion relative to the housing, the first set of rotating bearing elements distributed in a plane perpendicular to the axis of the drive shaft; a hammer shaft supported within the housing for axial and rotational movement relative to the housing, the drive shaft connected to the hammer shaft to drive the hammer shaft while allowing axial movement between the drive shaft and hammer shaft; a second set of rotating bearing elements fixed on one of the drive shaft and the hammer shaft for rotation with the one of the drive shaft and the hammer shaft, the second set of rotating bearing elements distributed in a plane perpendicular to the axis of the drive shaft; and the first set of rotating bearing elements and the second set of rotating bearing elements facing each other within the housing and engaging each other to impart a hammer action on the hammer shaft as the drive shaft and hammer shaft rotate with each other in the housing under axial load.