Hoisting system and method for hoisting a vertically-suspended object

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 11312452
APP PUB NO 20210221659A1
SERIAL NO

17152226

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Abstract

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A hoisting system is for hoisting a vertically-suspended object. The hoisting system has a winch having a winch drum with a hoisting rope. A first part of the hoisting rope has a first diameter and a second part has a second diameter being larger than the first diameter. The first part is connected with a first end of the second part. The first part is an inner part on the winch drum when the winch drum is completely wound. The second part has a further end that is connectable to the object for hoisting the object. A ratio between the first diameter and the second diameter is such that the minimum breakable load of the first part differs less than a factor of four from the minimum breakable load of the second part, and preferably less than a factor of three. A corresponding method is disclosed.

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Patent Owner(s)

Patent OwnerAddress
NATIONAL OILWELL VARCO NORWAY AS4604 KRISTIANSAND S

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Strand, Thor Kristiansand, NO 13 11
Tønnessen, Frank Grimstad, NO 2 1

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