Crane with pneumatically extensible gantry mast
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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1 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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Current AssigneeKoehring Co. (SPX Corporation)
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Original AssigneeGeorge C. Noll, Robert J. Bushong, Virgil F. Kramer
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InventorsBushong, Robert J., Noll, George C., Kramer, Virgil F.
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Application NumberUS04/253,948Time in Patent Office865 DaysField of SearchUS Class Current212/298CPC Class CodesB66C 23/36 mounted on road or rail veh...B66C 23/82 Luffing gearB66C 23/92 Snubbers or dashpots for pr...B66C 2700/0371 on a turntable
