Title:
CRANE MOTION COMPENSATOR
Document Type and Number:
Japanese Patent JPS552598
Kind Code:
A
Abstract:
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 floating 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 displacement 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 constant pneumatic force in order to displace the sheave down and pay out the cable, such as when the deck moves away from the crane.
Inventors:
FUARUUKU EI KAAN
Application Number:
JP7245679A
Publication Date:
January 10, 1980
Filing Date:
June 11, 1979
Export Citation:
Assignee:
NL INDUSTRIES INC
International Classes:
B66C13/02; B66C13/10; (IPC1-7): B66C13/04
Domestic Patent References:
| JPS46139A |
Next Patent: JPH0552599