# US 5,706,548 A · Pressure washer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,548 A - Document ID: US5706548A - Status: Granted - Kind: A - Application number: 08/556,075 - Filed: 1995-11-13 - Granted: 1998-01-13 - Earliest claimed: 1995-11-13 - Inventors: Nolan D. Schabacker - Web page: https://patentgrep.com/patent/US5706548A ## CPC - B08B 3/024: {Cleaning by means of spray elements moving over the surface to be cleaned} - E01H 1/103: {in which the soiled loosening or washing liquid is removed, e.g. by suction (removing liquids in general E01H1/108)} - B08B 2203/0229: Suction chambers for aspirating the sprayed liquid - B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL - E01H: STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING {OR PREVENTING} FOG IN GENERAL {CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS}(cleaning in general B08B) ## Abstract A pressure washer sprays a pressurized liquid into a groove of a pavement, floor or similar surface to remove dirt and debris from the groove. The dirt and debris dissolves and/or becomes suspended in the liquid and is then removed from the pressure washer for disposal. The pressure washer includes a cleaning hood with a cover plate and a skirt that extends downward from the periphery of the cover plate to form a less than air tight seal with the surface containing the groove. A spray nozzle in a forward portion of the cover plate directs the pressurized liquid spray downward into the groove, where the liquid picks up dirt and debris to form a liquid suspension and/or solution, and preferably, rearward toward an exhaust port which removes the liquid suspension and/or solution of dirt and debris from the cleaning hood. A handle extends upward from the cleaning hood for guiding the pressure washer. The handle also carries a pressurized liquid supply line connected to the spray nozzle and a vacuum line connected to the exhaust port. ## Claims ### Claim 1 A pressure washer for cleaning dirt and debris out of grooves in concrete, asphalt and similar surfaces, comprising: a cleaning hood; said cleaning hood having a cover plate; said cover plate having a spray nozzle therein which is directed in a downward direction for spraying a liquid downward, under pressure, into a groove to flush dirt and debris out of the groove and suspend and/or dissolve the dirt and debris in the liquid for removal; said cover plate having an exhaust port therein for withdrawing the liquid containing the suspended and/or dissolved dirt and debris; said cleaning hood having a skirt extending downward from a periphery of said cover plate to form a less than air tight seal with a surface containing the groove; liquid supply line means for connecting said spray nozzle of said cleaning hood to a source of the liquid under pressure; handle means extending upward from and secured to said cleaning hood for manipulating said pressure washer; said handle means including exhaust conduit means for connecting said exhaust port of said cleaning hood to a vacuum means for creating a suction under said cleaning hood to withdraw the liquid containing the suspended and/or dissolved dirt and debris from said cleaning hood; and guide means extending below a lower edge of said skirt for guiding said cleaning hood along the groove to keep said spray nozzle and said exhaust port centered over the groove. ### Claim 2 (depends on 1) The pressure washer of claim 1, wherein: said spray nozzle is directed downward and generally toward a location beneath said exhaust port to thereby direct the liquid sprayed from said spray nozzle downward and generally toward said exhaust port to facilitate removal of the liquid containing the suspended and/or dissolved dirt and debris from said cleaning hood. ### Claim 3 (depends on 2) The pressure washer of claim 2, wherein: said spray nozzle is located in a forward portion of said cover plate and said exhaust port is located in said cover plate rearward of said spray nozzle. ### Claim 4 (depends on 1) The pressure washer of claim 1, wherein: said spray nozzle is located in a forward portion of said cover plate and said exhaust port is located in said cover plate rearward of said spray nozzle. ### Claim 5 (depends on 1) The pressure washer of claim 1, wherein: said spray nozzle has a spray pattern that emits a liquid spray having a width at least wide enough to contact both sidewalls of the groove being cleaned. ### Claim 6 (depends on 1) The pressure washer of claim 1, wherein: said skirt is made of a flexible material. ### Claim 7 (depends on 6) The pressure washer of claim 6, wherein: said flexible material is a rubberlike material. ### Claim 8 (depends on 1) The pressure washer of claim 1, wherein: said skirt is a brush. ### Claim 9 (depends on 1) The pressure washer of claim 1, wherein: the handle means includes said liquid supply line means and means for turning the supply of liquid under pressure on and off and includes means for turning the vacuum means on and off. ### Claim 10 (depends on 1) The pressure washer of claim 1, wherein: the liquid comprises water. ### Claim 11 A pressure washer for cleaning dirt and debris out of grooves in concrete, asphalt and similar surfaces, comprising: a cleaning hood; said cleaning hood having a cover plate; said cover plate having a spray nozzle therein for spraying a liquid under pressure into a groove to flush dirt and debris out of the groove and suspend and/or dissolve the dirt and debris in the liquid for removal; said cover plate having an exhaust port therein for withdrawing the liquid containing the suspended and/or dissolved dirt and debris; said spray nozzle being directed in a downward direction and toward a location beneath said exhaust port; said spray nozzle being located in a forward portion of said cover plate and said exhaust port being located in said cover plate rearward of said spray nozzle; said spray nozzle and said exhaust port being substantially centered on a centerline of said cleaning hood; said cleaning hood having a flexible skirt extending downward from a periphery of said cover plate to form a less than air tight seal with a surface containing the groove being cleaned; said cleaning hood having adjustable spacing means located in said forward portion of said cover plate on either side of said centerline for spacing said flexible skirt of said cleaning hood a selected distance above the surface containing the groove being cleaned to provide a less than air tight seal between a lower peripheral edge of said flexible skirt and the surface containing the groove being cleaned; said cleaning hood including a guide means, extending below said spacing means, to be received within the groove to keep said spray nozzle and said exhaust port substantially centered over the groove; and handle means extending upward from and secured to said cleaning hood; said handle means including a liquid supply line means for connecting said spray nozzle to a source of the liquid under pressure; and said handle means including an exhaust conduit means for connecting said exhaust port to a wet-dry vacuum means for creating a suction under said cleaning hood to withdraw the liquid containing the suspended and/or dissolved dirt and debris from said cleaning hood. ### Claim 12 (depends on 11) The pressure washer of claim 11, wherein: said flexible skirt is made of a rubberlike material. ### Claim 13 (depends on 11) The pressure washer of claim 11, wherein: said flexible skirt is a brush. ### Claim 14 A pressure washer for cleaning dirt and debris out of grooves in concrete, asphalt and similar surfaces, comprising: a cleaning hood; said cleaning hood having a cover plate; said cover plate having a spray nozzle therein which is directed in a downward direction for spraying a liquid downward, under pressure, into a groove to flush dirt and debris out of the groove and suspend and/or dissolve the dirt and debris in the liquid for removal; said cover plate having an exhaust port therein for withdrawing the liquid containing the suspended and/or dissolved dirt and debris; said cleaning hood having a skirt extending downward from a periphery of said cover plate to form a less than air tight seal with a surface containing the groove; liquid supply line means for connecting said spray nozzle of said cleaning hood to a source of the liquid under pressure; handle means extending upward from and secured to said cleaning hood for manipulating said pressure washer; said handle means including exhaust conduit means for connecting said exhaust port of said cleaning hood to a vacuum means for creating a suction under said cleaning hood to withdraw the liquid containing the suspended and/or dissolved dirt and debris from said cleaning hood; and spacing means for spacing said skirt of said cleaning hood a selected distance above the surface containing the groove being cleaned to provide a less than air tight seal between a lower peripheral edge of said skirt and the surface containing the groove being cleaned; said spacing means being adjustable whereby said selected distance may be changed. ### Claim 15 (depends on 14) The pressure washer of claim 14, wherein: guide means extends below said spacing means for guiding said cleaning hood along the groove to keep said spray nozzle and said exhaust port centered over the groove.