Hydraulic and earth engineering – Marine structure or fabrication thereof – With work deck vertically adjustable relative to floor
Patent
1983-03-18
1985-06-04
Taylor, Dennis L.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With work deck vertically adjustable relative to floor
405195, 254 95, 254112, E02B 1708, B66F 700
Patent
active
045211345
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an elevating device for an artificial island or work platform, comprising a pontoon or work floor and a number of columns displaceable in vertical direction with respect to the pontoon or work floor by means of the elevating device at each column said elevating device consists of a number of driving devices having pinions meshing with gear racks fixed along the column, said driving devices in particular concerning the bearing of the pinion shaft, are fixed to the pontoon or work floor and consist of a motor, a driving gear and a brake.
Such an elevating device is generally known. In said known elevating device one or more pinions mesh with each gear rack and usually, there are several gear racks per column with meshing pinions. Said pinions are driven either by hydraulic motors or by electric motors. During displacement of the pontoon or work floor with respect to the columns and inversely the forces acting on the pinions are automatically balanced. When the motors are stopped the brakes come into operation, in which condition howerver, no balancing of the forces acting on the pinions and thus also on the gear racks exists anymore.
The invention has the object to provide an elevating device whereby said latter may also be obtained completely.
According to the invention said object is achieved in that each driving device is fixed to respectively form part of a reaction arm pivotable around the axis of the output shaft of the driving device, in that the reaction arm is coupled at one end to the pontoon or work floor through a hydraulic cylinder, at all of the reaction arms said hydraulic cylinders have a connection from both of the cylinder spaces to a valve adapted to shut off said connection or to connect both of the cylinder spaces to a common cnduit connecting all of the cylinders to each other and in that means are provided for moving simultaneously all of the valves into the closed condition when the motors are put in operation and to open condition when the brakes are put in operation. In the braked condition the hydraulic connection between the cylinders of the reaction arms performs the compensation of differences in forces.
Now, the invention will be elucidated with reference to the drawings.
FIG. 1 shows the principle of the invention.
FIG. 2 is partly a view and partly a horizontal section through a driving device of the elevating device according to the invention.
FIG. 1 shows part of a pontoon 1 and a column 2 provided with gear racks 3 and 4 respectively at two opposite edges.
On the pontoon a frame is provided indicated by the parts 5 and 6 schematically.
The circles 8, 10 and 7, 9 indicated by dash-dotted lines represent pinions meshing with the gear racks 3 and 4 respectively.
Pivotable around the axes of pinions 7 to 10 respectively are reaction arms 11, 12, 13 and 14 having ends 15, 16, 17 and 18 respectively which are connected pivotably to piston rods 19, 20, 21 and 22 respectively of hydraulic cyliners 23, 24, 25 and 26.
These cylinders are pivotably fixed to the platform 1 as schematically indicated at 27, 28, 29 and 30 respectively.
The reaction arms 11 to 14 each support a motor 61, a brake 62 and a gear box 60, not shown in FIG. 1 but in FIG. 2.
Near each cylinder 23, 24, 25 and 26 respectively a valve 31, 32, 33 and 34 respectively is situated which is movable from the open condition shown to a closed condition by means of operating means 35, 36, 37 and 38 respectively shown in the upper half of the valves.
In the open condition shown the space above the piston in each cylinder 23, 24, 25, 26 respectively is connected to the valve through a conduit 39, whereas the space below the piston is connected to the valve through a conduit 40 (see cylinder 23). In the open condition shown of the valves the conduits 39 and 40 communicate with each other as well as with a conduit 41, connecting the cylinders on both sides of a column to each other and connecting all of the cylinders to each other through a connecting conduct 42 when several driving units are superpose
REFERENCES:
patent: 3014346 (1961-12-01), Small
patent: 3044269 (1962-07-01), LeTourneau
patent: 3183676 (1979-05-01), LeTourneau
patent: 3435621 (1969-04-01), Johnson
patent: 3986368 (1976-10-01), Levingston
patent: 4007914 (1977-02-01), Sutton
Gusto Engineering B.V.
Taylor Dennis L.
LandOfFree
Elevating device for an artificial island or work platform does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Elevating device for an artificial island or work platform, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elevating device for an artificial island or work platform will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-826465