Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1977-03-18
1978-07-04
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
254172, F15B 102
Patent
active
040980820
ABSTRACT:
Wave-motion compensating apparatus for a crane is provided, which includes a hydro-pneumatic accumulator and an hydraulic ram, and additional components for controlling the fluid connection between the accumulator and the ram. The apparatus is intended to be coupled to a crane on an off-shore oil drilling rig, or the like, and it serves to compensate for the rising and falling wave motion between a vessel being unloaded and the crane. The compensating apparatus initially causes the load carrying cable of the crane to be maintained at a slight substantially constant tension permitting the load to rise and fall with the motion of the vessel. The apparatus at this time extracts and stores energy from the up and down motion of the load; then, after a few up and down cycles, the apparatus exerts a lifting force on the cable to lift the load clear of the crest of the next wave. The foregoing is achieved without the need for any external energy source apart from the wave motion itself. The crane then takes over and the energy stored in the compensating apparatus slowly bleeds away, and the apparatus is returned to a reset condition for the next load.
REFERENCES:
patent: 2554381 (1951-05-01), Patterson
patent: 2641106 (1953-06-01), Jelinek
patent: 2645899 (1953-07-01), Aller et al.
patent: 3842603 (1974-10-01), Ditzen
patent: 3902319 (1975-09-01), Olmsted
patent: 4046270 (1977-09-01), Baron et al.
Beecher Keith D.
Geoghegan Edgar W.
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