Displacing device for the carbon brushes in an electrical motor

摘要

The device has a pivotal carrier (5) on which is arranged brush holders (9) for the carbon brushes (34) of the electric motor and switch contacts in electric connection with the carbon brushes (34). The device also has a fixed contact plate (6) to hold stationary contacts. These are in electric connection with the field winding of the electric motor. The stationary contacts cooperate with the switch contacts as counter contacts in an alternating contacting of the carbon brushes. This reverses the direction of rotation of the electric motor when the carrier (5) pivots. The brush holders (9) are arranged on the carrier (5) such that a surface (17) of the holders (9) is facing the contact plate (6). Part (15) of this surface (17) extends into the contact plate (6) as a switch contact to directly contact the stationary contacts.