Patent ID: 6903481

Claim:
A commutator for electric motors, which has a cylindrical collector ( 1 , 25 ) disposed on a motor armature shaft and has electrical-contact means ( 4 , 5 , 26 , 27 ), which during one rotation of the collector ( 1 , 25 ) touch at least two each of a plurality of commutator laminations ( 3 , 37 ) that are present on the collector ( 1 , 25 ) and thus establish an electrical connection between the applicable commutator laminations ( 3 , 27 ) and external current connections ( 21 , 22 ), characterized in that the electrical-contact means comprise at least two electrically conductive cylinders ( 4 , 5 , 26 , 27 ) disposed in line with one another in the axial direction of the collector ( 1 , 25 ), the longitudinal axes ( 6 , 7 , 28 , 29 ) are parallel to the longitudinal axis ( 2 , 30 ) of the collector ( 1 , 25 ); and that the at least two cylinders ( 4 , 5 , 26 , 27 ) are placed relative to the collector ( 1 , 25 ) in such a manner and have a diameter such that the collector ( 1 , 25 ), in its rotation, rolls over the inside faces ( 8 , 11 ) or the outside faces ( 9 , 12 ) of the at least two cylinders ( 4 , 5 , 26 , 27 ), and in the process each of the cylinders ( 4 , 5 , 26 , 27 ) is touched always by only one lamination ( 3 , 37 ) of the collector ( 1 , 25 ).