Electro-hydraulic brush down force control

Details Electro-hydraulic brush down force control Electro-hydraulic brush down force control

1998-01-13

1999-08-31

Spisich, Mark

Brushing, scrubbing, and general cleaning

Machines

Brushing

15 501, 15 87, 15 98, 451353, A47L 1116, A47L 11283

Patent

active

059437243

ABSTRACT:
A floor cleaning machine of the type having a fluid driven scrub brush utilizes fluid pressure for applying down force on the scrub brush to a floor surface being cleaned. The fluid pressure applied is controlled by a fluid pressure regulator which has a movable valve element and an electrical coil for controlling the position of the movable valve element. There is a feedback circuit for controlling current through the coil which includes a source of power and a pulse width modulation switching device. The switching device in turn is controlled by a comparison between the current sensed in the coil circuit and an operator set value for the desired current to provide a desired down force on the cleaning brush.

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