B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
212/25, 254/89
B66C 23/18 (2006.01) B66C 13/02 (2006.01)
Patent
CA 1116590
CRANE MOTION COMPENSATOR ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed for displacing a crane lift hook and hook cable to follow the relative vertical motion between a crane and a loading deck such as occurs between float- ing vessels and a fixed crane. In the method, the hook cable is paid out or reeled in to maintain the hook a substantially constant distance from the deck in order to facilitate loading or unloading of cargo from the hook. The apparatus for achieving the method includes a vertically displaceable sheave over which the lift cable is reeved, a power ram to displace the sheave, and motive means operating the power ram. Preferably, the power ram is subjected to a constant upward pneumatic force to provide at least a portion of the force for displacing the moveable sheave upwardly to reel in the cable, such as in response to an upward heave of the deck relative to the crane. Variable dis- placement hydraulic pumps provide an additional hydraulic upward force to the power ram or alternatively provide a downward hydraulic force to displace the ram downwardly against the con- stant pneumatic force in order to displace the sheave down and pay out the cable, such as when the deck moves away from the crane.
329493
Kirby Eades Gale Baker
Nl Industries Inc.
LandOfFree
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