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Crane load inidicating arrangement

  • US 3,965,733 A
  • Filed: 05/10/1974
  • Issued: 06/29/1976
  • Est. Priority Date: 05/11/1973
  • Status: Expired due to Term
First Claim
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1. A load indicating arrangement for use with a crane or other lifting apparatus having a pivotally mounted telescoping boom comprising, boom supporting means, means for producing a first output signal representative of the total turning moment of the boom about its pivot in supporting a load, said first output signal producing means including transducer means for producing an output signal which is a function of the reaction sustained by the boom supporting means in supporting the boom and any bad suspended therefrom and angle sensing means for modifying said output signal in accordance with the sine of the angle included between the boom supporting means and the boom, means for producing a second output signal representative of the turning moment of the boom about its pivot due to the weight of the boom alone, means for combining said first and second output signals to produce a third output signal which is the algebraic difference between said first and second output signals and which is thus representative of the turning moment due only to the load, means for deriving a load radius output signal representative of the horizontal distance between the boom pivot point and the load and independent of the weight of the boom, a law generator unit for each mode of operation of the crane, a first one of the law generator units including means responsive to said load radius output signal for producing a fourth output signal which varies with the load radius and is representative of the maximum safe load moment for the crane in the appertaining mode of operation involving radius related duties and for the existing load radius, and means for comparing said fourth output signal with said third output signal to provide an indication of available lifting capacity.

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