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Hydraulic control system for weighing

  • US 5,064,008 A
  • Filed: 11/16/1990
  • Issued: 11/12/1991
  • Est. Priority Date: 03/05/1990
  • Status: Expired due to Fees
First Claim
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1. A method for accurately weighing a load lifted by an hydraulically operated lifting device of the type having lift arms hydraulically operated to lift a loaded container and empty it;

  • said method comprising the steps of;

    lifting a container means with lift arm means of an hydraulic system means;

    operating the hydraulic system means to cause the lift arm means to lift the container means to a reference position;

    generating a signal when the lift arm means have lifted said container means to the reference position;

    tapping off and bypassing hydraulic fluid from a lift circuit of the hydraulic system means of the lifting device;

    lowering said lift arm means at a slower rate than the normal rate of descent of the hydraulic system means;

    generating a signal when said lift arm means have lowered said container means to a weighing position;

    generating an analog electric signal from transducer means communicating with said tapped-off hydraulic fluid;

    receiving said analog electrical signal generated by the transducer means at an analog/digital converter means for generating a digital record; and

    ,activating said hydraulic system means to cause said lift arm means to lift said container means to an emptying position for unloading contents therefrom.

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