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US 4,958,805 AGranted
Windlass for offshore structures
OwnerRobert Willamssoninventor
Life of this patent
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Abstract
A windlass for offshore structures comprises power mechanism (18) for rotation of a chain wheel (13) about a horizontal axis (24a) during maneuvering of an anchor chain (14) extending between an anchor and a chain box (15). The chain wheel (13) is rotatably supported in a wheel housing (24) which is pivotable about a vertical shaft (22) below the operating water line (OD) of the structure and on the outside of its planking.
Claims6
In an offshore platform or the like adapted to be anchored in the sea and providing therewith an operating water line (OD), the combination comprising:
- (a) a platform deck support leg (11) extending through said operating water line when the platform is anchored,
- (b) a chain storing box (15) mounted exteriorly of said leg and adapted to be submerged below said operating water line, and with said box being filled with water so as not to contribute to the boyancy of said offshore platform,
- (c) a chain wheel (13) disposed above said box and rotatable about a horizontal mount and adapted to receive an anchor chain (14) extending from said box,
- (d) means (29) mounting said chain wheel to the exterior of said leg so that said chain wheel is submerged below said operating water line and so that an anchor chain extending between said storing box and chain wheel is disposed below said operating water line,
- (e) a vertical shaft (22) disposed adjacent said chain wheel below said operating water line,
- (f) said mounting means (d) including a wheel housing (24) mounting said chain wheel for pivotal movement about said vertical shaft,
- (g) and at least partially submerged drive means to rotate said chain wheel (13) about said horizontal mount.
4 more elements
Dependencies are inferred from the claim text.