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US 4,788,927 AGranted
Retractable towing shackle
AssigneeShell Western E&P Inc.
InventorJames M. Casey
Life of this patent
Estimating the term…
Abstract
A method and apparatus for towing an offshore structure which is protected from damage caused by ice impinging on the walls of the structure when the apparatus is not in use by positioning a retractable towing shackle within a recess in an outer wall of the structure.
Claims7
An apparatus for towing an offshore structure comprising:
- a shackle having spaced apart legs terminating in eyes adapted to receive a shackle pin therethrough;
- means for avoiding impingement of ice on said shackle, said means including a recess in an outer wall of said structure for receiving said shackle;
- and
- mounting means fixedly secured within said wall having an aperture for receiving said shackle pin therethrough.
1 more element
A method of towing an offshore structure comprising:
- avoiding impingement of ice on a retractable shackle assembly by positioning said retractable shackle assembly within a recess in an outer wall of said structure;
- extending said shackle assembly from said recess to a towing position;
- securing towing means to said shackle assembly;
- and
- towing said structure with said towing means.
2 more elements
A method of towing an offshore structure comprising:
- avoiding impingement of ice on a retractable shackle assembly by positioning said retractable shackle assembly within a recess in an outer wall of said structure;
- securing towing means to said shackle assembly;
- extending said shackle assembly from said recess to a towing position;
- and
- towing said structure with said towning means.
2 more elements
Dependencies are inferred from the claim text.