Rotation direction changeover switch for low-wear two-pole universal motor of hand-held tool is separate multipole changeover switch with four poles and connected to exactly four carbon brushes

摘要

The rotation direction changeover switch is in the form of a separate multipole changeover switch that is connected to all the carbon brushes (9a-9d) of the two-pole universal motor (2). The changeover switch has four poles and is connected to exactly four carbon brushes. Each two carbon brushes are arranged diametrically opposite each other as a pair.