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Load weight indicating system for load moving machine

  • US 4,627,013 A
  • Filed: 11/30/1983
  • Issued: 12/02/1986
  • Est. Priority Date: 12/01/1982
  • Status: Expired due to Term
First Claim
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1. A load weight indicating system for a load moving machine including a support, and a front attachment supported by said support for pivotal movement about a first pivot, said front attachment having a first linkage element supported by said support for pivotal movement about said first pivot, a second linkage element supported by said first linkage element for pivotal movement about a second pivot, a loading section supported by said second linkage element, and first and second hydraulic actuator means mounted for pivotally moving the first linkage element and the second linkage element, respectively;

  • said load weight indicating system comprising;

    first and second displacement detector means for detecting displacement α

    1 and β

    1 of at least the first linkage element and the second linkage element, respectively, of said front attachment;

    pressing force sensor means for obtaining values Pb, Pr associated with a pressing force K1 exerted by at least one of the first and second hydraulic actuator means of said front attachment;

    weight calculating means for calculating the weight of a load carried by the loading section based on the values α

    1, β

    1, Pb and Pr obtained at least by the first and second displacement detector means and the pressing force sensor means, respectively;

    weight indicating means for indicating a value associated with the load weight obtained by said weight calculating means; and

    position setting means for setting an arbitrarily selected position of said front attachement;

    said weight calculating means including;

    (a) a first means for calculating a moment of rotation M0 of the front attachment about the first pivot when the loading section carries no load, based on the values α

    1, Pb and Pr obtained at least by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through a set position set by said position setting means with the loading section carrying no load,(b) a second means for calculating a moment of rotation M1 of the front attachment about the first pivot when the loading section carries a load, based on the values α

    1, Pb and Pr obtained by said first displacement detector means and said pressing force sensor means when the front attachment is moved and passes through the set position with the loading section carrying the load,(c) a third means for calculating a horizontal distance LJ between a position of the center of gravity of the load in the loading section and the first pivot, based on the values α

    1 and β

    1 obtained at least by said first and second displacement detector means when the front attachment is moved and passes through the set position, and(d) a fourth means operative to calculate (M1 -M0)/LJ based on the results of the calculation performed by said first, second and third means.

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