Vacuum cleaner with motor driven rotary carpet brush and linear hard floor brush, for cleaning floor has sensing system using ultrasonic transmitter and receiver to determine nature of floor

摘要

The floor cleaning head (1) of a vacuum cleaner has a motor driven rotary carpet brush (3) and a linear hard floor brush (6) which are automatically raised or lowered by a control system using an ultrasonic transmitter (9) and receiver (10) according to the type of floor surface.