Streamlined wear-resistant deep tillage tool

Claim 1

In a farm implement: a normally horizontal tool bar; an elongated, solid, deep tillage shank attached to the bar and depending therefrom, said shank having a pair of opposed, flat, horizontally spaced, upright walls, an upper, longitudinally concave, downwardly and forwardly sloping top, a lower, longitudinally convex, downwardly and forwardly sloping bottom, and a leading edge, said top and bottom spanning the distance between said walls and converging as said edge is approached; and a shoe releasably attached to said shank, said shoe being provided with an elongated body having a pair of opposed, parallel, flat, horizontally PG,10 spaced, upright sides provided with upper, straight, downwardly and forwardly sloping, longitudinal extremities, a forwardmost, elongated, straight, sharpened terminus, a flat rearmost end extending upwardly beyond said top, an elongated, downwardly and forwardly inclined, uppermost surface, and an elongated, lowermost, transversely flat face, the distance between said sides being greater than the distance between said walls, said terminus and said end spanning the distance between said sides, said surface extending between said terminus and said end, said face having a first, elongated portion extending forwardly beyond said edge at an elevation lower than the latter and merging with said terminus and a second elongated, longitudinally flat portion between the first portion and said end, the first portion being normally inclined downwardly and forwardly toward said terminus, the second portion being normally inclined upwardly and rearwardly toward said end, said shoe having a flat, rear, triangular bevel merging with said end thereabove and a flat, front, triangular bevel merging with said terminus thereabove, said surface having a pair of opposed, transversely inclined, essentially triangular sections merging into an uppermost ridge spanning the distance between said bevels.