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Down pressure spring adjustment

  • US 5,544,709 A
  • Filed: 04/17/1995
  • Issued: 08/13/1996
  • Est. Priority Date: 04/17/1995
  • Status: Expired due to Term
First Claim
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1. In a tool supporting rig for an agricultural implement supported from a frame by a parallel bar linkage rockable about a transversely extending axis, the parallel bar linkage including upper and lower links having first ends, first pivot structure connecting the first ends to a first bracket, and second ends connected to a second bracket, a spring tensioning assembly for adjustably biasing the rig a preselected direction, the spring tensioning assembly including:

  • an upright notched portion supported adjacent the first pivot structure, the notched portion including vertically spaced notches of preselected configuration;

    a rotatable indexing member including a mating portion generally conforming to at least a portion of the configuration of the notches;

    a down pressure spring connected between the rotatable indexing member and the second bracket, the down pressure spring biasing the mating portion of the indexing member into engagement with one of the notches; and

    structure for selectively rotating the indexing member to move the mating portion incrementally in a vertical direction along the notches and thereby adjust the tension of the spring;

    wherein the notched portion comprises a saw-tooth section with straight-edged teeth extending vertically along and integral with one of the brakcets, and wherein the rotatable indexing member includes sides conforming to the area between the teeth.

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