Patent ID: 7523568

Claim:
A snow plow having a plow face structure, said plow face being mounted for rotation about a substantially vertical axis and affixed to a first plate of a clutch mechanism, said first clutch plate being circular in plan, and having a large plurality of generally vertically extending protuberances spaced about its outer periphery; a second clutch plate attached to brackets for attaching said snow plow to a vehicle, and being axially aligned with said first clutch plate, said second plate having plural pockets constructed and arranged for receiving said protuberances from said first plate in nested relation, said first and second clutch plates having shallow, domed configurations an axially extending member including resilient means exerting a force for holding said plates in said nested relation, said plate having shallow, domed configurations, whereby, when said plow face strikes an obstacle that is located off center with respect to said plow face, said off-center strike tends to overcome the force holding said clutch plates together and allows said first clutch plate to rotate relative to said second clutch plate.