SURFACE TREATMENT APPARATUS Russian patent published in 2002 - IPC

FIELD: mechanical engineering. SUBSTANCE: apparatus has machine frame, which supports head unit driven by engine and adapted for treating surface, device for selectively changing pressure applied by head unit to mentioned surface between at least first value and second value different from said first value, device for selectively changing speed, at which head unit is driven by engine between at least first speed and second speed different from said first speed. Device for changing driving speed has selectively set plurality of toothed gears having transmission ratio determined on the basis of required operations, and control device adapted for restricting operation of apparatus at first speed, when it operates under pressure of first value, and for restricting operation of apparatus at second speed, when apparatus operates under pressure of second value. Apparatus may be used for treating floor surface. EFFECT: wider operational capabilities by providing different range of operations for treating surfaces and enhanced reliability in operation. 33 cl, 16 dwg