Metal working – Method of mechanical manufacture – Repairing
Reexamination Certificate
1998-07-30
2001-03-20
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Repairing
C254S386000, C175S113000, C175S202000, C175S203000
Reexamination Certificate
active
06202274
ABSTRACT:
The present invention relates to an apparatus for mounting a piston-cylinder arrangement in a derrick, comprising two or more hydraulic piston-cylinder arrangements for raising and lowering a yoke which travels on guide rails in the derrick itself, and a method of changing gaskets in this type of piston-cylinder arrangement.
A derrick structure which was developed in 1987 by the present inventor and which has shown great promise embodies the RamRig™ concept. Two hydraulic piston-cylinder arrangements are used in the derrick for raising and lowering the drill string. The cylinders operate between the drill floor and a yoke which travels on guide rails in the derrick itself. The advantages of this concept are numerous. Among the most important are that is possible to place the drill floor at a higher level than the platform floor, that a derrick may be constructed having a significantly lower air resistance, and that a higher level of safety and longer lifetime are attained for the most expensive components of the derrick.
Since it is possible to position the drill floor higher than the platform floor, pipe handling is significantly simplified. There is no longer any need to arrange the pipe handling equipment at a high level in the derrick. All pipe handling equipment may be placed on the platform floor and the drill floor.
U.S. Pat. No. 4,341,373 shows a similar derrick structure, where a yoke is slidably mounted on guide rails and is raised with the aid of a plurality of piston-cylinder arrangements. A travelling block is suspended from the yoke by a plurality of wire lines. In the travelling block is mounted the top drive.
The object of the present invention is to solve an important practical problem in the realization of the RamRig™ concept. This problem consists of the need to periodically change gaskets on the piston and/or cylinder in the piston-cylinder arrangement. This is very important with respect to safety. By means of the features disclosed in the characterizing clause of the subsequent claim
1
, and the method disclosed herein we have succeeded in providing a simple mounting apparatus for the cylinder which permits rapid and uncomplicated changing of the gaskets.
REFERENCES:
patent: 4170340 (1979-10-01), Mouton, Jr.
patent: 4341373 (1982-07-01), Mouton, Jr.
patent: 4341383 (1982-07-01), Reichert
patent: 5069426 (1991-12-01), Gabrysch
patent: 5638911 (1997-06-01), Beechwood et al.
patent: 870 387 (1953-03-01), None
Hong John C.
Hughes S. Thomas
Maritime Hydraulics AS
Pillsbury Madison & Sutro LLP
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