Double Safety Locking Mechanism for Offshore Longshank Hooks
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Solution Overview
Problem
Existing locking mechanisms for longshank lifting hooks in the offshore industry are complex, expensive, and time-consuming to operate, particularly in underwater operations where they fail to provide adequate double safety barriers against unintentional cargo release, especially in challenging ocean conditions.
Innovation Solution
A double safety locking mechanism comprising a wire-equipped closing lip and a release handle, integrated with a sliding assembly and lock system, which allows for independent operation of both horizontal and vertical movements, ensuring secure attachment and easy operation by ROVs, and can be fitted to standard longshank hooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional locking mechanisms are used on longshank hooks, then security against unintentional cargo release is provided, but the mechanism becomes complicated, expensive, and time-consuming to operate
Solution Approach 1:
The locking mechanism is divided into two independent parts: a closing lip that moves horizontally to close the hook gate, and a safety latch that moves vertically to lock the closing lip. This segmentation allows each component to perform its function simply and reliably, avoiding the need for a single complex locking system.
Solution Approach 2:
The safety latch is nested within the structure of the closing lip assembly. The latch engages with a recess in the closing lip, creating a compact integrated system where the secondary locking feature is contained within the primary closing mechanism, reducing overall complexity while maintaining double safety.
2Reliability
If existing double safety locking mechanisms are implemented, then security requirements are met, but operational time during critical lifting phases increases
Solution Approach 1:
The closing lip is pre-positioned and spring-loaded to automatically close the hook gate when the load is applied. The safety latch is pre-configured to engage with the closing lip's recess, so that both locking actions occur almost simultaneously during the lifting operation, rather than requiring separate manual operations.
Solution Approach 2:
The spring-loaded closing lip automatically performs the closing action when load is applied, and the safety latch self-engages with the closing lip structure. This self-service mechanism eliminates the need for operators to manually perform complex locking sequences, significantly reducing operational time while maintaining double safety.
3Reliability
If complex locking mechanisms are used, then security is improved, but ease of operation by ROVs or divers is reduced
Solution Approach 1:
The safety latch is designed as a separate, externally accessible component that can be independently operated from the closing lip. The latch protrudes outward and can be engaged or disengaged by ROV manipulators or divers without needing to access the internal mechanisms of the closing lip, simplifying underwater operation.
Solution Approach 2:
The locking system uses orthogonal movements: the closing lip moves horizontally in the plane of the hook gate, while the safety latch moves vertically perpendicular to the gate plane. This dimensional separation allows ROVs to operate the two locking actions independently from different approach angles, greatly improving ease of underwater operation.
Data Source
AI summary
Support assembly (F5.13.1) moving sliding assembly (F5.13.3), position lock assembly (F5.13.6), push lock rod (F5.13.8), tension spring (F5.13. I0)), threaded cap (F5.13.1 1) and release handle (F5.13.12). Bolt holes (F5.13.2), lower protection rod (F5.13.31) and upper protection rod (F5.1 3.32). Two lower protection rods (F5.13.14) and one upper protection rod (F5.1 3, 15) with strengthening link (F5.13.16). Push lock rod (F5.1 3,8) is equipped to lock sliding assembly (F5.13.3) in to possible positions in in lock down holes (F5.13.9).