Patent ID: 6158818
Filing Date: 2000-12-12
Classification: E02F,E21D

Abstract:
A rock cutting head comprising:a) a housing, said housing having a front portion and a rear portion aligned along a longitudinal axis thereof, said rear portion having a width;b) at least one drive motor having a drive axis for driving cutting drums, said at least one drive motor is mounted to said housing rear portion;c) a pair of cutting drums mounted to a shaft, said pair of cutting drums and said shaft are carried by said housing front portion and said pair of cutting drums shaft extends parallel to said at least one drive motor drive axis;d) a gear unit provided within said housing and between said at least one drive motor and said shaft, said gear unit comprising a drive pinion gear operably connected to said at least one drive motor, a spur wheel operatively connected to said shaft and an intermediate wheel disposed between said pinion gear and said spur wheel for translating rotation from said pinion gear to said spur wheel, said intermediate wheel is at least larger than said pinion gear and said spur wheel;e) said housing including at least one opening extending therethrough and disposed adjacent at least one of said drive pinion gear, said intermediate wheel and said spur wheel, said at least one opening having a removable lid; andf) a connecting plate assembly for connecting said rock cutting head to an extension arm of a working machine, said connecting plate assembly is secured to said rear portion of said housing to provide a unitary structure therewith and extends perpendicular to the longitudinal axis thereof and has a width at least greater than that of said width of said rear portion of said housing.