Grinder head

Abstract

A grinder head for high pressure mobile cleaning of roadways. The grinder head combines a rotating spinner member having polycrystalline diamond cutting tips which work in combination with ultra-high pressurized fluid for removing roadway stripes and the like matters from a roadway with damaging the underlying surface. The cutting tips having a polycrystalline diamond cutting material and are positioned along an outer rim of the spinner member in either a single or staggered position.

What is claimed is: 
     
         1 . A grinder head for removal of surface coatings comprising:
 a spindle having a proximal end and a distal end with a centrally disposed fluid conduit extending therebetween, said proximal end of said spindle securable to a hydraulic motor for rotation thereof, said fluid conduit having an inlet fluidly coupled to a high pressure fluid source;   a spinner member having a centrally disposed hub secured to a distal end of said spindle, said spinner member having a plurality of spaced apart bridges extending outwardly from said hub in a spoke-like format to an outer rim, a lower surface of said spaced apart bridges each having a plurality of apertures fluidly coupled to said spindle fluid conduit;   a spray nozzle attached to each said aperture, each said spray nozzle for dispersing high pressure fluid introduced through said spindle fluid conduit;   a plurality of cutting tips releasably secured to a lower surface of said outer rim, said cutting tips positioned outboard from said spray nozzles with a frontal face secured at a predetermined angle and distance from a roadway for grinding paint strips therefrom;   whereby said cutting tips and said spray nozzles expedite removal of roadway paint strips by a combination of grinding and high pressure fluid.   
     
     
         2 . The grinder head according to  claim 1  wherein each said frontal face of said cutting tip includes a polycrystalline diamond cutting material. 
     
     
         3 . The grinder head according to  claim 1  wherein each said cutting tip is carbide coated. 
     
     
         4 . The grinder head according to  claim 1  wherein each said cutting tip is held in position by an adjoining fastener. 
     
     
         5 . The grinder head according to  claim 1  wherein said bridges are fluidly coupled to said spindle fluid conduit and said nozzle apertures by a common conduit positioned internal said spinner member. 
     
     
         6 . The grinder head according to  claim 5  wherein said spinner member has between five and nine spaced apart bridges 
     
     
         7 . The grinder head according to  claim 5  wherein each said bridge contains between five and nine spray nozzles. 
     
     
         8 . The grinder head according to  claim 1  wherein said high pressure fluid is water pressurized between substantially 25,000 and 40,000 pounds per square inch. 
     
     
         9 . The grinder head according to  claim 1  wherein said spray nozzles are threadedly attached to said apertures. 
     
     
         10 . The grinder head according to  claim 1  including a shroud having a top, sides and an open bottom, said top of said shroud being held to said hydraulic motor, said shroud including an exhaust aperture coupled to a vacuum source for collection of surface materials removed from the roadway. 
     
     
         11 . The cleaning device of  claim 10  including a plurality of wheels supporting said shroud and positioning said cutting tips a predetermined distance from the roadway surface.