| 主权项 |
1. A tree stump excavation tool configured for use, mounted to an arm of an excavation machine, for removal of a tree stump from a substrate, said tree stump excavation tool comprising:
a body configured to be mounted for rotation at an end of the arm of an excavation machine, a first arm having a upper end attached to and extending from said body to form a first side plate and a second arm having a upper end attached to and extending from an opposite, second end of said body to form a second side plate, said first side plate and said second side plate each having an opposite lower end, the lower end of said first side plate being angularly advanced relative to the lower end of said second side plate in a direction of substrate engagement motion, and a unitary plate mounted to extend between the lower end of said first side plate arm and the lower end of said second side plate, said unitary plate defining a blade having an axis of rotation and a forward edge forming a set of multiple, pointed teeth integrally formed by the plate,
each pointed tooth of said set of multiple, pointed teeth being disposed generally in a direction of rotation of said tree stump excavation tool relative to the end of the arm of the excavation machine and defining a pair of opposite tooth blade side edges disposed non-parallel to the axis of rotation of the blade and non-planar relative to the pairs of opposite tooth blade side edges of other pointed teeth of said set of multiple, pointed teeth, andsaid set of multiple, pointed teeth comprising at least:
a first, pointed tooth disposed at the forward edge of the unitary plate for cutting engagement with the substrate and a second pointed tooth disposed at the forward edge of the unitary plate for cutting engagement with the substrate,said first, pointed tooth and said second, pointed tooth being laterally spaced apart along the axis of rotation of said tree stump excavation tool relative to the end of the arm of the excavation tool,said first, pointed tooth being angularly advanced relative to said second, pointed tooth in a direction of substrate ripping motion, wherein said first, pointed tooth and said second pointed tooth are engaged separately and in sequence for cutting the substrate,each said pointed tooth being disposed at a predetermined angle to a tangent to an arc of rotation extending generally through a tooth point, with an arc center at an axis of rotation of said tooth point, andsaid first, pointed tooth, and said second, pointed tooth being non-parallel relative to the axis of rotation. |
