Patent ID: 6161250
Filing Date: 2000-12-19
Classification: E01H

Abstract:
A surface sweeping machine particularly adapted for sweeping particulate material under wet or dry conditions comprising a pickup head along which an air stream travels from an air inlet to an air outlet, means for generating said air stream, a hopper, first conduit means for transporting air entrained particulate material from said air outlet to said hopper, second conduit means for transporting air entrained particulate material from said hopper to said air inlet, third conduit means for transporting a portion of the air entrained particulate material from the second conduit means to a small particle separator, said small particle separator including means for separating the air entrained particulate material portion into a small particle entrained first air stream and a smaller particle entrained second air stream, and means for filtering said smaller particle entrained second air stream to substantially filter therefrom the smaller particles and continuing substantially clean air flow along a third air stream.