ELEVATING DEVICE FOR AN ARTIFICIAL ISLAND OR WORK PLATFORM

摘要

Elevating device for an artificial island or work platform comprising a pontoon (1) or work floor and a number of columns (2) displaceable in vertical direction with respect to the pontoon (1) respectively the work floor by means of the elevating device. At each column (2) the elevating device consists of a number of driving devices having pinions (7-10) meshing in gear racks (3, 4) fixed along the columns (2). In particular concerning its bearing the shafts of the pinions (7-10) are fixed to the pontoon (1) or work floor and consist of a motor, a driving gear and a brake. Each driving device is fixed to respectively form part of a reaction arm (11-14) pivotable around the axis of the output shaft of the driving device. At its one end (15) the reaction arm (11-14) is coupled to the pontoon (1) or work floor through a hydraulic cylinder (23-26). At all of the reaction arms (11-14) the hydraulic cylinders (23-26) have a connection (39, 40) from both cylinder spaces to a common conduct (42) connecting all of the cylinders (23-26) to each other. Further, means are provided for moving simultaneously all of the valves (31-34) in the closed condition when the motors are put in operation respectively to open when the brakes are put in operation.