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Crane with pneumatically extensible gantry mast

  • US 3,187,906 A
  • Filed: 01/25/1963
  • Issued: 06/08/1965
  • Est. Priority Date: 01/25/1963
  • Status: Expired due to Term
First Claim
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1. IN COMBINATION, A FRAME, A BOOM PIVOTED TO SAID FRAME FOR VERTICAL SWINGING MOVEMENT ABOUT A HORIZONTAL AXIS, A FLUID PRESSURE RETRACTIBLE AND EXTENSIBLE GANTRY MAST PIVOTALLY CONNECTED TO SAID BOOM, HOISTING MEANS CONNECTED TO THE PEAK OF SAID MAST FOR VERTICALLY SWINGING SAID MAST AND THUS SAID BOOM, AND A SOURCE OF AIR UNDER PRESSURE CONNECTED TO SAID MAST TO EXTEND SAID MAST AND WHEREBY SAID HOISTING MEANS IS ADAPTED FOR RETRACTING SAID MUST THEREBY RENEWING SAID SOURCE OF AIR UNDER PRESSURE.

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