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Method and device for maintaining a position of a load suspended from a lifting gear

  • US 7,267,240 B2
  • Filed: 03/29/2005
  • Issued: 09/11/2007
  • Est. Priority Date: 09/30/2002
  • Status: Active Grant
First Claim
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1. A method for controlling a position of a load on a lifting gear, comprising the steps of:

  • determining a position of a load suspended from a trolley of a lifting gear via at least four cables which hold the load and terminate at four separate locations on the load; and

    counteracting a swinging motion of the load by operatively connecting each of the four cables with a separate drive and selectively operating the drives to selectively adjust the length of the cables, wherein the counteracting step includes the steps of automatically ascertaining a change in tension of a cable as a result of a change in torque applied by an electric motor of the drive associated to the cable, and operating at least one of the drives in response to the change in tension of the cable to make the cable taut again.

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