Abstract: A roller assembly for a mobile cleaning system for cleaning a work surface can include a drive shaft, a sheath, a bushing, and a bushing shroud. The drive shaft can be rotatable about a drive axis, and the drive shaft can include a driven end and an opposite bushing end. The sheath can be supported by the drive shaft and the sheath can be rotatable with the drive shaft. The sheath can include a shell engageable with the work surface. The bushing can be located about the bushing end of the drive shaft. The bushing shroud can be connected to the bushing. The sheath and the drive shaft can be together rotatable with respect to the bushing and the bushing shroud, the bushing shroud can include an outer portion defining a first radius of curvature and a recessed portion connected to the outer portion.

Abstract: A folding canopy has a canopy top made of flexible sheet material; and a canopy frame. The canopy top is adapted to attach onto the canopy frame, and the canopy frame includes a number of members. A pair of left cross support bars have a first left cross support bar, and a second left cross support bar. The first left cross support bar is pivotally connected to the second left cross support bar. A pair of right cross support bars includes a first right cross support bar, and a second right cross support bar. The first right cross support bar is pivotally connected to the second right cross support bar.