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Method and apparatus for automatically maintaining seed trench depth during seed planting operations

  • US 6,827,029 B1
  • Filed: 11/04/2003
  • Issued: 12/07/2004
  • Est. Priority Date: 11/04/2003
  • Status: Expired due to Term
First Claim
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1. A seed planting assembly comprising:

  • a laterally extending support member;

    a planting unit including a planting unit frame supported by the support member, wherein the planting unit frame carries;

    i. a seed trench opening assembly operable to create a seed trench in a ground surface;

    ii. a seed delivery assembly delivering seeds into the seed trench;

    iii. a seed trench closing assembly operable to close the seed trench;

    iv. a depth regulating member having a vertical position relative to the seed trench opening assembly, wherein the depth regulating member experiences an actual vertical force that controls ground surface engagement; and

    a spring supported by the support member and connected to the planting unit, wherein the spring provides a variable spring force against the frame in response to variations in internal spring pressure;

    a pressurized fluid source operable to provide fluid to the spring; and

    a valve linking the fluid source to the spring, wherein the valve is in mechanical communication with the seed trench opening assembly and enables fluid flow in and out of the spring to correspondingly adjust the spring force when the actual vertical force differs from a desired vertical force.

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