Patent ID: 7926583

Claim:
An earthworking implement for moving a material on a surface in situ, for attachment to a motive source, A. wherein said motive source comprises; i. a chassis comprising; (a) a left side of said chassis, (b) a right side of said chassis, (c) a forward end of said chassis, ii. a lift arm assembly pivotally attached to said chassis comprising; (a) an outwardly disposed end on said lift arm assembly projecting outwardly from said forward end of said chassis and (b) a means of conveying downward force to said outwardly disposed end, causing an upward lifting of a part of said chassis, (c) a tilt mechanism that is pivotably attached at a predetermined position near said outwardly disposed end, and a means of controllably varying the position of said tilt mechanism, B. said earthworking implement comprising; i. a support structure comprising, (a) an attachment structure rigidly attached to said support structure, and removably attached to said tilt mechanism of said lift arm assembly, (b) a first opposed load bearing surface, ii. a tool carrier assembly, comprising; (a) an earthworking tool attached to said tool carrier assembly, (b) a depth guide attached to said tool carrier assembly, capable of retaining said earthworking tool at a controllably variable height above or below said surface by said means of controllably varying the position of said tilt mechanism, while said depth guide remains in contact with said surface, comprising; 1. a material contact surface that is circumferential, 2. an interior structure, attached in a concentric relation to said material contact surface, which defines a depth guide axis about which said material contact surface rotates, and 3. a depth guide axis retainer assembly that pivotally attaches said depth guide to said tool carrier assembly, (c) a second opposed load bearing surface, iii. a multiple axis rotation assembly pivotally connecting said tool carrier assembly to said support structure comprising; (a) a first load bearing surface, (b) a controllably variable vertical axis about which said first load bearing surface and said first opposed load bearing surface rotate in opposition, (c) a second load bearing surface, (d) a controllably variable horizontal axis about which said second load bearing surface and said second opposed load bearing surface rotate in opposition, whereby said earthworking implement is propelled about said surface in situ by said motive source, moving said material on said surface in situ with said earthworking tool retained at a controllably variable height above or depth below said surface, while said tool carrier assembly is controllably pivoted about said controllably variable vertical axis and said controllably variable horizontal axis, and said depth guide axis is held in a fixed position in relation to said tool carrier assembly as said tool carrier assembly is rolled over said surface in situ.