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US 4,668,127 AGranted
Mobile, offshore, jack-up, marine platform adjustable for sloping sea floor
AssigneeBethlehem Steel Corporation
InventorJames E. Steele
Life of this patent
Estimating the term…
Abstract
A mobile, offshore, jack-up, marine platform, adjustable for sloping sea floor having a mat, a multilegged column pivotally connected thereto and a work platform slidably mounted on the column. Means are included for independently vertically adjusting at least one leg and/or offset ballasting of the work platform.
Claims20
A mobile, offshore, jack-up marine platform adjustable for sloping sea floor comprising:
- (a) a mat;
- (b) a tiltable column formed from a plurality of hollow tubular legs, each leg pivotally attached to the mat;
- (i) means on at least one leg for independently vertically raising and lowering such leg with respect to the mat, to tilt the column;
- (c) a jack-up work platform slidably mounted through its central portion on the column;
- (d) a jack-up means interconnected between the work platform and each leg of the column for vertically moving the work platform with respect to the mat;
- each jack-up means including:
- (i) a first and second vertically spaced pair of pin boxes spanning a portion of each leg;
- (ii) a plurality of vertically-oriented piston and cylinder assemblies located on each side of said leg column for interconnecting said first and second pairs of pin boxes;
- and
- (iii) each pin box carrying a plurality of vertically spaced, horizontally-oriented piston and cylinder assemblies, each of which serves to selectively engage every alternately vertically-spaced aperture in the leg with a reciprocating anchor pin.
7 more elements
A mobile, offshore, jack-up, marine platform adjustable for sloping sea floor comprising:
- (a) a mat;
- (b) a tiltable column formed from a plurality of hollow tubular legs, each leg pivotally attached to the mat;
- (i) means on at least one leg for independently vertically raising and lowering such leg with respect to the mat, to tilt the column;
- (c) a jack-up work platform slidably mounted through its central portion on the column, the work platform including an end portion extending outwardly from the central portion and a ballastable portion opposite the end portion;
- (d) a skid unit movably mounted on the end portion of the work platform;
- and
- (e) a jack-up means interconnected between the work platform and each leg of the column for vertically moving the work platform with respect to the mat;
- each jack-up means including:
- (i) a first and second vertically spaced pair of pin boxes spanning a portion of each leg;
- (ii) a plurality of vertically-oriented piston and cylinder assemblies located on each side of said leg for interconnecting said first and second pair of pin boxes;
- and
- (iii) each pin box carrying a plurality of verticall-spaced, horizontally-oriented piston and cylinder assemblies, each of which serves to selectively engage every alternately vertically-spaced aperture in the leg with a reciprocating anchor pin.
9 more elements
Dependencies are inferred from the claim text.