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CRANE SAFE LOAD INDICATOR

  • US 3,870,160 A
  • Filed: 06/22/1972
  • Issued: 03/11/1975
  • Est. Priority Date: 06/25/1971
  • Status: Expired due to Term
First Claim
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1. A safe load indicator system for use with a crane or other lifting apparatus having a pivotally mounted boom and extensible boom supporting means comprising, means for producing a first signal representative of the actual total turning moment of the boom about its pivot by determining the angle included between the extensible boom supporting means and the boom and the reaction sustained by the extensible boom supporting means in supporting the boom and a load suspended therefrom, means for deriving a second signal determined by the boom luff angle and the length of the boom and which is indicative of the current load radius, means responsive to said second signal for producing a reference signal representative of the maximum safe turning moment of the boom about its pivot and corresponding to the current load radius, and means responsive to the first and the reference signals for providing an indication of the available lifting capacity.

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