Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Patent
1978-06-12
1981-05-19
Jillions, John M.
Implements or apparatus for applying pushing or pulling force
Device or member for contacting and guiding moving cable
Including rotatable, cable contacting, pulley wheel element
91207, 91417R, 92108, 175 27, B66D 148
Patent
active
042680131
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.
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patent: 3653635 (1972-04-01), Bates et al.
patent: 3687205 (1972-08-01), Mori
patent: 3707922 (1973-01-01), Dillon
patent: 3804183 (1974-04-01), Duncan et al.
patent: 3865066 (1975-02-01), White et al.
patent: 3871527 (1975-03-01), Schimmeyer et al.
patent: 3905580 (1975-09-01), Hooper
patent: 3912227 (1975-10-01), Meeker et al.
patent: 4025055 (1977-05-01), Strolenberg
Jillions John M.
NL Industries Inc.
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