Patent ID: 7360725

Claim:
A crusher for crushing material comprising: (a) a housing, said housing comprising: (i) a substantially cylindrical crushing chamber comprising and being defined by a substantially tubular wall having an inner circumferential surface; (ii) first and second opposed side plates, each of said first and second side plates being attached to a corresponding end of said substantially tubular wall, said first and second side plates being substantially perpendicular to the longitudinal axis of said tubular wall; (iii) an intake aperture in said tubular wall, said intake aperture being in communication with said cylindrical chamber; (iv) a discharge aperture in said tubular wall, said discharge aperture being in communication with said cylindrical chamber; and (v) an inlet door having an arcuate inner face, said inlet door pivotally secured to said wall, said arcuate inner face having a curvature of substantially similar radius of said inner circumferential surface of said cylindrical chamber, wherein said inlet door may be selectively pivoted between a first position away from said intake aperture and a second position over said intake aperture such that when said inlet door is pivoted to said first position away from said intake aperture said arcuate inner face of said inlet door may guide material towards said intake aperture, and such that when said inlet door is pivoted to said second position over said intake aperture said arcuate inner face is substantially flush with said inner circumferential surface of said cylindrical chamber; (b) a rotary drive shaft supported by at least one of said side plates such that at least a portion of said drive shaft is disposed within said cylindrical chamber wherein said at least a portion of said drive shaft is disposed within said cylindrical chamber substantially coaxially with said longitudinal axis of said cylindrical chamber; and (c) one or more impact tools for crushing received material, each said impact tool being coupled to said at least a portion of said rotary drive shaft disposed within said cylindrical chamber, each said impact tool further being arranged for rotary movement by said rotary drive shaft along a path of travel substantially concentric with said inner circumferential surface of said cylindrical chamber; wherein when said inlet door is pivoted to said second position over said intake aperture, said one or more impact tools may impact material adhering to said arcuate inner face of said inlet door thereby removing said adhered material from said arcuate inner face and into said chamber.