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Earth working machine and blade condition control system therefor

  • US 4,431,060 A
  • Filed: 04/15/1981
  • Issued: 02/14/1984
  • Est. Priority Date: 04/15/1981
  • Status: Expired due to Fees
First Claim
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1. In an earth working machine including an articulated frame (10) adapted for moving over the earth and having a front frame section (15) and a rear frame section (18) pivotally coupled with said front frame section (15), an earth working blade (30), means (22, 26, 28) for mounting said blade (30) for rotation on said front frame section (15), means (38, 40) connected between said blade mounting means (22, 26, 28) and said front frame section (15) for adjustably supporting said blade mounting means (22, 26, 28) on said front frame section (15), apparatus for automatically controlling said supporting means (38, 40) to maintain said blade (30) at a preselected slope relative to a reference plane irrespective of lateral movement of said front frame section (15) relative to said rear frame section (18), the improvement comprising:

  • blade circle angle detector means (96) for sensing rotation of said blade (30) relative to the line-of-flight thereof, said blade circle angle detector means (96) including a ground engaging guide number (116) and means (102, 110, 112,

         114) for mounting said guide member (116) rearward of said blade (30) for rotation about a reference axis extending perpendicular to said reference plane;

    angular position sensing means (90) for sensing changes in the inclination of said rear frame section (18) relative to said reference plane;

    electronic resolver means (94) for producing a control signal indicative of the degree of both the rotation of said blade (30) relative to said line-of-flight and the inclination of said rear frame section (18) relative to said reference plane; and

    control means (88, 60,

         64) for operating at least one of said adjustable supporting means (38,

         40) and maintaining said blade (30) at said preselected slope thereof.

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