Method for cleaning floor surfaces with high pressure water jets

A method for removing paint from floors and floor gratings by using a cleaning device having a plurality of high pressure water nozzles mounted within a hollow spray enclosure and discharging a stream of water under high pressure through said water nozzles towards a floor and floor grating wherein said cleaning device includes a fixed spindle mounted to said hollow spray enclosure, with said water nozzles being mounted to a tubular body which is rotatably mounted on said spindle, a dump valve including a movable valve element which is normally biased to a first position to direct said water through an orifice into said hollow spray enclosure, a pneumatic power means rotatably driving said tubular body, and said pneumatic power means being operably connected to said dump valve for shifting said valve element to a second position, to close said orifice and direct all of said water through a vertical bore within said spindle comprising:

• directing said stream of high pressure water through said orifice into said hollow spray enclosure when said valve element is in its first position and said tubular body is not being driven for rotation by said pneumatic power means;
• directing all of said stream of high pressure water downwardly through said vertical bore within said fixed spindle and into a plurality of radial discharge ports at the lower end of said vertical bore only when said pneumatic power means is rotatably driving said tubular body and said valve element is in its second position;
• said tubular body having an annular water chamber in close proximity to said radial discharge ports, said annular water chamber receiving said downwardly directed stream of high pressure water and directing said stream of high pressure water radially outward through a plurality of angularly disposed water nozzles whereby high pressure water jets impinge onto the floor and floor grating;
• permitting movement of high pressure water between said tubular body and said spindle to thereby lubricate the rotative movement of said tubular body on said spindle;
• and
• movably transporting said water jets over and along surface portions of said floor and floor grating for forcefully and operatively impinging upon the surface portions of said floor and floor grating.