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A plow assembly includes a housing, a shaft having a first eccentricity and a shaft having a second eccentricity. The shaft having a first eccentricity is mounted within the housing for rotation about a first axis of rotation, and the shaft having a second eccentricity is mounted within the housing

A plow assembly includes a housing, a shaft having a first eccentricity and a shaft having a second eccentricity. The shaft having a first eccentricity is mounted within the housing for rotation about a first axis of rotation, and the shaft having a second eccentricity is mounted within the housing for rotation about a second axis of rotation. The assembly also includes a surface breaker blade and a balancing assembly. The surface breaker blade is mounted on the shaft having a first eccentricity in such a manner that rotation of the shaft having a first eccentricity causes the surface breaker blade to move in response to the first eccentricity of the shaft. The balancing assembly is mounted on the shaft having the second eccentricity in such a manner that rotation of the shaft having the second eccentricity causes the balancing assembly to move in response to the second eccentricity of the shaft. The assembly also includes a mechanism for rotating the shaft having a first eccentricity about the first axis of rotation, and a mechanism for rotating the shaft having a second eccentricity about the second axis of rotation.

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What is claimed is: 1. A plow assembly comprising: (a) a housing; (b) a surface breaker blade; (c) means for mounting the surface breaker blade within the housing, said means being adapted to impart surface breaker momentum to the surface breaker blade with respect to the housing; (d) a balancing a

What is claimed is: 1. A plow assembly comprising: (a) a housing; (b) a surface breaker blade; (c) means for mounting the surface breaker blade within the housing, said means being adapted to impart surface breaker momentum to the surface breaker blade with respect to the housing; (d) a balancing assembly; (e) means for mounting the balancing assembly within the housing, said means being adapted to impart balancing momentum to the balancing assembly with respect to the housing that is substantially equal to and opposite the surface breaker momentum. 2. The plow assembly of claim 1 wherein: (a) the means for mounting the surface breaker blade within the housing comprises: (i) a first shaft having a first eccentricity, said first shaft being mounted within the housing for rotation about a first axis of rotation; (ii) means for rotating the first shaft about the first axis of rotation; (b) the means for mounting the balancing assembly within the housing comprises: (i) a second shaft having a second eccentricity, said second shaft being mounted within the housing for rotation about a second axis of rotation; (ii) means for rotating the second shaft about the second axis of rotation; wherein the surface breaker blade, first shaft, balancing assembly and second shaft are arranged and adapted so that simultaneous rotation of the first shaft and the second shaft will impart surface breaker momentum to the surface breaker blade that is substantially equal to and opposite the balancing momentum imparted to the balancing assembly. 3. The plow assembly of claim 1 which includes a plurality of vibration isolators that are mounted between the surface breaker blade and the housing. 4. The plow assembly of claim 1 which includes a plurality of vibration isolators that are mounted between the balancing assembly and the housing. 5. The plow assembly of claim 1: (a) which includes a mounting assembly that is adapted to be attached to a vehicle; (b) wherein the housing is pivotally attached to the mounting assembly. 6. The plow assembly of claim 5: (a) wherein the mounting assembly is adapted to be pivotally attached to the vehicle; (b) which includes a first actuator that is attached between the mounting assembly and the vehicle so as to pivot the mounting assembly about a generally horizontal axis of rotation; (c) which includes a second actuator that is attached between the housing and the mounting assembly and adapted to pivot the housing about a generally vertical axis of rotation. 7. The plow assembly of claim 2 wherein the surface breaker blade comprises: (a) a blade mount that is mounted on the first shaft in such a manner that rotation of the first shaft causes the blade mount to move in response to the first eccentricity of the first shaft; (b) a blade component that is detachably mounted to the blade mount. 8. The plow assembly of claim 7 wherein: (a) the blade mount includes a first elongate component that is disposed generally horizontally within the housing; (b) the balancing assembly includes a second elongate component that is mounted on the second shaft in such a manner that rotation of the second shaft causes the second elongate component to move in response to the second eccentricity of the second shaft, said second elongate component being disposed generally vertically within the housing. 9. The plow assembly of claim 8 wherein: (a) the first elongate component has a first component long axis; (b) the first elongate component has a first mass comprising a first mass front portion and a first mass rear portion, wherein said first mass front portion is located in front of a plane through the first elongate component which includes the first axis of rotation and is perpendicular to the first component long axis, and wherein said first mass rear portion is located behind the plane through the first elongate component which includes the first axis of rotation and is perpendicular to the first component long axis; (c) the first mass front portion is equal to the first mass rear portion; (d) the second elongate component has a second component long axis; (e) the second elongate component has a second mass comprising a second mass upper portion and a second mass lower portion, wherein said second mass upper portion is located above a second plane which passes through the second elongate component which includes the second axis of rotation and is perpendicular to the second component long axis, and wherein said second mass lower portion is located below the second plane through the second elongate component which includes the second axis of rotation and is perpendicular to the second component long axis; (f) the second mass upper portion is equal to the second mass lower portion. 10. A plow assembly comprising: (a) a housing; (b) a shaft that is mounted in the housing for rotation about an axis of rotation, said shaft having a first eccentric portion and a second eccentric portion; (c) a motor that is mounted so as to rotate the shaft with respect to the housing; (d) a surface breaker blade that is mounted so as to move in response to the first eccentric portion of the shaft; (e) a balancing assembly that is mounted in the housing so as to move in response to the second eccentric portion of the shaft; wherein the surface breaker blade, balancing assembly, shaft, first eccentric portion and second eccentric portion are arranged and adapted so that rotation of the shaft will impart surface breaker momentum to the surface breaker blade with respect to the housing and will impart balancing momentum to the balancing assembly with respect to the housing, said surface breaker momentum being substantially equal to and opposite the balancing momentum. 11. The plow assembly of claim 10 wherein: (a) the housing includes a left side wall, a right side wall and a rear wall; (b) a first vibration isolator is mounted between the surface breaker blade and the left side wall of the housing; (c) a second vibration isolator is mounted between the surface breaker blade and the right side wall of the housing; (d) a third vibration isolator is mounted between the balancing assembly and the left side wall of the housing; (e) a fourth vibration isolator is mounted between the balancing assembly and the right side wall of the housing. 12. The plow assembly of claim 11 which includes a fifth vibration isolator that is mounted between the surface breaker blade and the rear wall of the housing. 13. The plow assembly of claim 10 wherein the surface breaker blade comprises: (a) a blade mount that is mounted on the shaft in such a manner that rotation of the shaft causes the blade mount to move in response to the first eccentric portion of the shaft; (b) a blade component that is detachably mounted to the blade mount. 14. The plow assembly of claim 13 wherein: (a) the blade mount includes a first elongate component that is disposed generally horizontally within the housing; (b) the balancing assembly includes a second elongate component that is disposed generally vertically within the housing, said second elongate component being mounted on the shaft in such a manner that rotation of the shaft causes the second elongate component to move in response to the second eccentric portion of the shaft. 15. The plow assembly of claim 14 wherein: (a) the first elongate component has a first component long axis; (b) the first elongate component has a first mass comprising a first mass front portion and a first mass rear portion, wherein said first mass front portion is located in front of a plane through the first elongate component which includes the first axis of rotation and is perpendicular to the first component long axis, and wherein said first mass rear portion is located behind the plane through the first elongate component which includes the first axis of rotation and is perpendicular to the first component long axis; (c) the first mass front portion is equal to the first mass rear portion; (d) the second elongate component has a second component long axis; (e) the second elongate component has a second mass comprising a second mass upper portion and a second mass lower portion, wherein said second mass upper portion is located above a second plane which passes through the second elongate component which includes the second axis of rotation and is perpendicular to the second component long axis, and wherein said second mass lower portion is located below the second plane through the second elongate component which includes the second axis of rotation and is perpendicular to the second component long axis; (f) the second mass upper portion is equal to the second mass lower portion. 16. A plow assembly which comprises: (a) a housing; (b) a shaft that is mounted in the housing for rotation about an axis of rotation, said shaft having a first eccentric portion and a second eccentric portion; (c) means for rotating the shaft; (d) a surface breaker blade comprising: (i) a blade mount that is mounted on the shaft in such a manner that rotation of the shaft causes the blade mount to move in response to the first eccentric portion of the shaft, said blade mount having a blade mount long axis and a blade mount mass, said blade mount mass comprising a blade mount mass front portion and a blade mount mass rear portion, wherein said blade mount mass front portion is located in front of a first plane through the blade mount which includes the axis of rotation and is perpendicular to the blade mount long axis, and wherein said blade mount mass rear portion is located behind the first plane, and wherein said blade mount mass front portion is equal to said blade mount mass rear portion; (ii) a blade component that is detachably mounted to the blade mount; (e) a balancing assembly: (i) that is mounted on the shaft so as to move in response to the second eccentric portion of the shaft; (ii) which has a balancing assembly long axis; (iii) which has a balancing assembly mass that is approximately equal to the blade mount mass and is configured so as to be generally divided equally between a balancing assembly mass upper portion and a balancing assembly mass lower portion, wherein said balancing assembly mass upper portion is located above a second plane which passes through the balancing assembly which includes the axis of rotation and is perpendicular to the balancing assembly long axis, and wherein said balancing assembly mass lower portion is located below the second plane, and wherein said balancing assembly mass upper portion is equal to said balancing assembly mass lower portion; wherein the housing, shaft, means for rotating the shaft, surface breaker blade and balancing assembly are configured and arranged so that vibrations created by the interaction between and among the shaft, means for rotating the shaft, surface breaker blade and balancing assembly are generally confined within the housing. 17. The plow assembly of claim 16 wherein: (a) the housing includes a left side wall, a right side wall and a rear wall; (b) a first vibration isolator is mounted between the surface breaker blade and the left side wall of the housing; and (c) a second vibration isolator is mounted between the surface breaker blade and the right side wall of the housing; and (d) a third vibration isolator is mounted between the balancing assembly and the left side wall of the housing; and (e) a fourth vibration isolator is mounted between the balancing assembly and the right side wall of the housing. 18. The plow assembly of claim 17 which includes a fifth vibration isolator that is mounted between the surface breaker blade and the rear wall of the housing. 19. The plow assembly of claim 16: (a) which includes a mounting assembly that is adapted to be attached to a vehicle; (b) wherein the housing is pivotally attached to the mounting assembly. 20. The plow assembly of claim 19: (a) wherein the mounting assembly is adapted to be pivotally attached to the vehicle; (b) which includes a first actuator that is attached between the mounting assembly and the vehicle so as to pivot the mounting assembly about a generally horizontal axis of rotation; (c) which includes a second actuator that is attached between the housing and the mounting assembly and adapted to pivot the housing about a generally vertical axis of rotation.