Patent ID: 7441303

Claim:
A motorized pavement cleaning system for removing dust and/or debris from paved surfaces, comprising: a wheeled vehicle having a cleaning unit mounted thereto; means for providing a flow of hydraulic fluid; said cleaning unit including a debris-containment hopper having an inlet for accepting a flow of debris-containing air, a pick-up head having an air-flow inlet and an air-flow outlet, said pick-up head for movement along the surface to be cleaned, a fan assembly for creating a flow of pressurized air at an outlet thereof, a torque-providing hydraulic displacement motor for driving said fan assembly to create a flow of pressurized air in response to a flow of hydraulic fluid therethrough, an air-flow connection between the outlet of the fan assembly and the inlet of the pick-up head, and another air-flow connection between the outlet of the pick-up head and the inlet of the hopper; and at least one other torque-providing displacement motor mechanically connected to said first-mentioned motor and through which a portion of the hydraulic flow is passed, said other torque-providing displacement motor operative in at least two modes including a first mode to contribute torque to drive the fan wheel or a second mode in which the first-mentioned torque-providing motor drives the fan wheel and the other torque-providing displacement motor controls the flow of hydraulic fluid to at least one auxiliary hydraulic device.