Patent ID: 6341823
Filing Date: 2002-01-29
Classification: E21C

Abstract:
A rotatable cutting tool for mounting within a through opening defined within a holder mounted on earth displacement equipment, said rotatable cutting tool comprising:a body defining: an upper end defining a distal end; a lower end being configured to be rotatably received through the holder through opening; a flange dividing said upper end and said lower end, said flange defining a perimeter having a diameter larger than a diameter defined by said lower end to prevent excavated material from entering the holder through opening, thereby protecting the holder through opening and said body lower end; and a plurality of radial fins circumferentially spaced and disposed on said upper end and said flange, each of said plurality of fins defining a notched portion for allowing flow of excavated material between successive pairs of said plurality of fins, said plurality of fins strengthening said body and reducing vibration of said rotatable cutting tool, whereby a useful life of said rotatable cutting tool is enhanced.