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Subsoil fertilizer applicator having arcuately adjustable knife

  • US 5,027,724 A
  • Filed: 04/03/1990
  • Issued: 07/02/1991
  • Est. Priority Date: 04/03/1990
  • Status: Expired due to Fees
First Claim
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1. In a subsoil applicator for agricultural substances, the improvement comprising:

  • a support adapted to be mounted on a mobile frame;

    a coulter rotatably mounted on said support for rotation about an axis transverse to the normal direction of travel of the frame,said coulter having an outer circular periphery;

    an upright knife carried by the support in trailing relation to the coulter and having means for discharging a substance into the soil as the knife passes therethrough,said knife having a leading arcuate edge conforming generally to the lower rear portion of the coulter periphery and spaced closely behind said portion,said knife further having a forwardmost tip at the lower end of said leading edge and a bottom extremity spaced a distance about the lowermost portion of the coulter periphery; and

    means for adjustably attaching the knife to said support in a manner to promote maintaining the closely spaced relationship between the lower rear peripheral portion of the coulter and the arcuate edge of the knife without substantial change in the distance between the lower extremity of the knife and the lowermost peripheral portion of the coulter, notwithstanding progressive reduction in the diameter of the coulter through wear,said adjusting means including structure limiting the knife during adjustment to a compound action that includes rotational forward rocking and arcuate displacement upwardly and forwardly along an arcuate path of travel,said leading arcuate edge of the knife being adjusted generally upwardly and inwardly toward said axis of rotation of the coulter.

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