Abstract: A hand-powered tool in which a spindle for driving a tool attachment is driven by a bevel gear. The spindle is supported in bearings on both sides of the bevel gear and extends through an opening in a stationary transverse shaft on which the bevel gear is journaled. Two pinions fixed to the spindle on opposite sides of the transverse shaft are moved into and out of meshing engagement with the bevel gear by shifting the spindle longitudinally in order to reverse the direction of rotation of the spindle.

Abstract: A cleaning system comprises a conveyor and an air knife having a number of side-by-side, closely-adjacent slots which provide communication from an internal chamber to a forward edge. As a result, air charged into the chamber issues from the slots as a sheet in streamline flow, which is effective along sharply-defined margins of a workpiece conveyed therepast. The system is especially suited for cleaning powder from wire leads of an electrical component, without disturbing the deposit on the component body.