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US 7,479,192 B2Granted
Flat surface washing apparatus
OwnerRobert Ottersoninventor
Life of this patent
Estimating the term…
Abstract
An engine and high pressure pump are mounted onto a wheeled chassis. High pressure water is distributed to a rotating wand and nozzle assembly on the wheeled chassis so that as the chassis is moved along a linear path, high pressure water is sprayed onto an underlying surface to clean the surface. Optional diffusion plates may be used to prevent high pressure water from being sprayed directly onto the underlying surface in part of the rotational path defined by the wand and nozzle assembly.
Claims19
A method of washing a surface, comprising the steps of:
- a) mounting to a wheeled chassis an engine, a pump having a low pressure inlet and a high pressure outlet, and a pair of rotating arms having nozzles mounted in spaced apart positions thereon;
- b) supplying fluid to the low pressure inlet, pressurizing the fluid and causing high pressure fluid to spray from the nozzles in a 360° spray path toward the surface;
- and
- c) occluding at least a portion of the 360° spray path so that high pressure fluid is blocked from directly hitting the surface in the blocked portion of the 360° spray path.
1 more element
A method of washing a surface, comprising the steps of:
- a) mounting to a wheeled chassis an engine, a pump having a low pressure inlet and a high pressure outlet, and a pair of rotating arms having nozzles mounted in spaced apart positions thereon, said nozzles spaced apart by a distance;
- b) supplying fluid from a source external to the wheeled chassis to the low pressure inlet;
- c) pressurizing the fluid and causing high pressure fluid to spray from the nozzles in a 360° spray path toward the surface, said 360° spray path having a fixed diameter;
- and
- d) occluding at least a portion of the a 360° spray path so that high pressure fluid is blocked from directly hitting the surface in the occluded portion of the spray path.
2 more elements
Surface cleaning apparatus, comprising:
- a wheeled chassis;
- an engine and a high pressure pump mounted on the chassis, the pump having a low pressure inlet configured for attachment to a fluid source external to the chassis, and a high pressure outlet through which fluid may flow;
- a rotary valve mounted on the chassis and fluidly connected to the high pressure outlet;
- at least two nozzles fluidly connected to the rotary valve, each of said nozzles configured for directing fluid toward the surface in a 360° spray path having a fixed diameter.
1 more element
Dependencies are inferred from the claim text.