Patent ID: 6203415
Filing Date: 2001-03-20
Classification: B24B,Y10S

Abstract:
An improved direct drive water-driven rotary tool, comprising:a substantially annular rigid metal housing having a cylindrical cavity;a drive shaft having a first and second end wherein said first end is centrally mounted for rotation in said metal housing;a water-driven impeller rotatably mounted in said cylindrical cavity, said impeller having a central hole to allow for said first end of said drive shaft to be inserted therethrough, said impeller comprising a plurality of blades;a substantially elongated annular inlet conduit removably connected at one end to and protruding from said housing and removably connected at a second end to a water supply under high pressure, said inlet conduit including a first nozzle having a nozzle tip in fluid communication with said impeller to rotatably drive said impeller;a cylindrically-shaped dish removably affixed to said housing including a central orifice for said second end of said drive shaft to protrude therethrough;an annular backing pad removably affixed to said second end of said drive shaft to be rotated thereby;a disposable working disk for sanding or grinding;means for attaching said working disk to said backing pad;said dish comprises a support plate having a plurality of apertures disposed on its outer face such that water that is used to drive said impeller is able to flow through the support plate apertures and escape through centrifugal action; anda shroud sized strategically to fit around the periphery of said dish having predetermined spacing between the periphery of said dish, for deflecting said water that is used to drive said impeller away from said backing pad, said shroud having a substantially annular flange around its periphery.