Abstract: The present invention relates to a simple mechanical dual stage pressure control for a cleaning head operatively coupled to a cleaning vehicle for engaging a surface to be cleaned and to methods of engaging and using such a dual stage pressure control to perform surface cleaning, surface maintenance, surface conditioning and the like. While the present invention is described and depicted primarily with reference to a cleaning head having dual rotary scrubbing brushes, the present invention finds diverse application in the art of surface cleaning, maintenance, conditioning and the like. Accordingly, the present invention is readily adaptable to cleaning heads having one or more of the following applications, including without limitation, such cleaning heads designed and adapted to: burnish, polish, scrub, sweep, brush, treat and wipe a surface to be cleaned wherein an increased downforce is beneficially selectively applied to such cleaning head to increase the efficacy of such cleaning head.

Abstract: The present invention relates to a simple mechanical dual stage pressure control for a cleaning head operatively coupled to a cleaning vehicle for engaging a surface to be cleaned and to methods of engaging and using such a dual stage pressure control to perform surface cleaning, surface maintenance, surface conditioning and the like. While the present invention is described and depicted primarily with reference to a cleaning head having dual rotary scrubbing brushes, the present invention finds diverse application in the art of surface cleaning, maintenance, conditioning and the like. Accordingly, the present invention is readily adaptable to cleaning heads having one or more of the following applications, including without limitation, such cleaning heads designed and adapted to: burnish, polish, scrub, sweep, brush, treat and wipe a surface to be cleaned wherein an increased downforce is beneficially selectively applied to such cleaning head to increase the efficacy of such cleaning head.

Abstract: This is concerned with a sweeper of the type that has a power operated brush that sweeps debris off of a floor or other surface to be cleaned and throws it into a hopper with a vacuum fan arranged to draw air from the hopper through a filter and exhaust it to the atmosphere. More particularly, the sweeper is provided with a precleaner and/or demister which separates the larger particles, and possibly moisture, from the airstream as it moves through the hopper, thereby protecting and/or aiding the filter.