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Apparatus for subsoil application

  • US 4,033,271 A
  • Filed: 02/13/1976
  • Issued: 07/05/1977
  • Est. Priority Date: 11/04/1974
  • Status: Expired due to Term
First Claim
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1. In a subsoil knife, a body having:

  • an elongated blade having a front, a rear, a bottom, a top, and a pair of opposite sides with respect to the normal path of travel of the body,the longitudinal axis of the blade extending between said top and bottom thereof,said blade having a soil-slicing, line edge all along the front thereof which is devoid of flat surfaces extending transversely of said normal path of travel of the body,said sides of the blade progressively diverging from said line edge as said rear of the blade is approached,said bottom of the blade sloping upwardly and rearwardly from said front of the blade in the same plane as a pair of diagonally extending line edges on said opposite sides of the blade;

    an elongated soil-firming wedge integral with said blade along said bottom of the latter, the longitudinal axis of said wedge extending between said front and rear of the blade,said wedge having a pair of lateral triangular faces converging downwardly and inwardly to a common lowermost, soil-creasing, fore-and-aft extending line edge and diverging upwardly to form said diagonal line edges with the sides of the blade,said soil-slicing line edge, said soil-creasing line edge, and said diagonal line edges leading to and converging forwardly in a soil-piercing point on the body,said wedge terminating rearwardly at a location spaced forwardly from said rear of the blade to thereby define a recess topped by said bottom of the blade and fronted by the rear termination of said wedge; and

    a pair of elongated, fore-and-aft extending wings projecting outwardly from said opposite sides of the blade directly above said recess,said wings having lower surfaces serving as lateral extensions of said bottom of the blade and lying in the same diagonal plane as said diagonal line edges, said wings further having upper surfaces sloping downwardly and forwardly toward said diagonal line edges,said wings converging laterally and forwardly toward said point at the same rate and in linear alignment with said diagonal line edges,said diagonal line edges being at the lateralmost extremity of the body from said point rearwardly to said wings, whereupon, from the wings rearwardly, the wings represent the lateralmost extremity of the body.

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