Marine propulsion – Screw propeller – Shafting
Reexamination Certificate
2008-08-22
2010-11-23
Olson, Lars A (Department: 3617)
Marine propulsion
Screw propeller
Shafting
C384S097000
Reexamination Certificate
active
07837524
ABSTRACT:
A device that when fitted to a motor vessel's existing propulsion gear improves the performance and reduces potential damage and wear of underwater propeller shaft bearings, commonly referred to as “cutlass bearings” that are used on boats, ships, etc. Designed with radially mounted impeller blades around the periphery of the propeller shaft, the device creates a forced flow of water by centrifugal pumping action, which creates suction along the shaft abaft the cutlass bearing, thereby increasing the flow of water through the cutlass bearing. The device also greatly diminishes the probability that fouling around a propeller shaft will severely restrict water flow through the cutlass bearing.
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Hartt Jacqueline E.
Lowndes Drosdick Doster, Kantor & Reed, P.A.
Olson Lars A
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