Patent ID: 6784589
Filing Date: 2004-08-31
Classification: H01R,H02K,Y10T

Abstract:
A plane carbon commutator comprising:a plurality of metal segments fixed to a commutator body made of resin, said metal segments having engaging holes and cut-rising pieces forming tip ends projecting inwardly from peripheral edges of said engaging holes; and a carbon previously burnt at a high temperature, said carbon having engaging projections being engaged with said engaging holes provided in said metal segments and integrally formed as one unit, each engaging projection having an end and a peripheral side, wherein the tip ends of said cut-rising pieces extend inwardly from the peripheral edges of the holes to engage the peripheral sides of the engaging projections with pressure sufficient to form coarse faces on the peripheral sides as the projections are inserted into the holes, and to prevent said engaging projections from being pulled out from said engaging holes, so that it is unnecessary to form coarse faces on the peripheral sides of said engaging projections before inserting the projections into said engaging holes.