Guide tower mounted crane for a jack-up platform

摘要

A new and improved crane adapted to be rotatably mounted about the guide tower of a vertically movable leg of an offshore jack-up platform. In one form, the crane is mounted for rotation about the leg tower section on a bearing tube having a thrust bearing interposed between a tower section flange and the lower end of the bearing tube. In a second form, the crane is mounted about the leg tower section utilizing upper rollers and hook rollers coacting with a support flange mounted with the tower section.