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Control apparatus

  • US 3,207,339 A
  • Filed: 02/05/1962
  • Issued: 09/21/1965
  • Est. Priority Date: 02/05/1962
  • Status: Expired due to Term
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1. APPARATUS FOR AUTOMATICALLY CONTROLLING THE HOIST AND CROWD MOTIONS OF A DIPPER OF A SHOVEL DURING A DIGGING OPERATION INCLUDING:

  • (A) MEANS FOR SENSING THE HOIST MOTION OF THE DIPPER DURING THE DIGGING OPERATION AND DEVELOPING A SIGNAL CORRESPONDING TO THE ACTUAL HOIST MOTION, (B) AND CONTROL MEAND CONNECTED TO SAID SENSING MEANS RESPONSIVE TO VARIATIONS IN THE ACTUAL HOIST MOTION RELATIVE TO A REFERENCE HOIST MOTION TO CAUSE THE CROWD

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