Automatic cut-off design;

With some appliances, it is necessary to replace carbon brushes one after another without remachining the commutator. To ensure that the subsequent brushes which replace the first one achieve sufficient life, the commutator must be sufficiently round and free of excessive flecking.

This can only be guaranteed if when the corresponding carbon brushes reach the wear limit, the commutator is not excessively roughened by arcing or made out of reoudness by in creased brush sparking.

This can be achieved by fitting a so-called "Cut-off Device" in the carbon brushes.

This system is designed to obviate damage to commutator on midget mortors where brushes are likely to become worn beyond the operational limit.

The moment the brush has worn to its replacement level the cut-off pin automatically interrupts the circuit.

Alarm Indicators;

Control of brushes bring optimal security during operation for electrical motors.

This method implemented for saving the commutator by using an alarm indicator fixed on the carbon brushes. This technique gives a warning in advance before the commutator is damaged by the contact with the flexible. For handling this signal, the power tools must have an electronic device incorporated.

Serrated Surface;

Normally, carbon brushes have to spend many hours to bed the surface to the required radius of the commutator and this may overheat and create sparks.

The serrated surface will minimize the time of brushes face bedding and ensures full performance of the function most effectively.