Spring-Loaded Finger Element for Self-Locking Safety Hook
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Solution Overview
Problem
Conventional self-locking lifting hooks face risks of unintentional load dropping due to manual manipulation challenges and potential failure of locking mechanisms, especially during load insertion and handling operations.
Innovation Solution
Incorporation of a spring-loaded finger element pivotably mounted at the upper part of the hook body to maintain the hook opening closed, regardless of the two-arm lever's position, providing an additional safety feature to prevent load dropping and simplify handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional self-locking hook with a two-arm lever and locking mechanism is used, then the hook can remain closed during lifting operations, but the locking mechanism may unintentionally release due to direct hits, momentum of inertia, wear, or spring breakage
Solution Approach 1:
The patent introduces a finger element that acts as a preliminary safety barrier before the main locking mechanism. This finger element is spring-loaded to automatically close the hook opening and can be manually opened only when needed. It provides beforehand protection against unintentional release of the main locking mechanism due to impacts, inertia, wear, or spring breakage, thereby cushioning against the harmful effect of load dropping.
Solution Approach 2:
The finger element serves as an intermediary safety component between the external environment and the main locking mechanism. It mediates the safety function by providing an additional layer of protection that does not interfere with the normal operation of the two-arm lever locking mechanism but protects against its potential failure modes.
2Reliability
If a spring-loaded finger element is added to close the hook opening independently of the lever position, then safety is enhanced by preventing load dropping, but device complexity increases
Solution Approach 1:
The patent segments the closure function into two independent components: the main two-arm lever closure arm for primary load-bearing closure, and a separate spring-loaded finger element for secondary safety closure. This segmentation allows each component to perform its specific function independently, enhancing overall reliability while keeping the design modular and manageable.
Solution Approach 2:
The spring-loaded finger element is designed to automatically close the hook opening through spring force without requiring manual intervention. It self-activates to provide safety closure, reducing the need for complex control mechanisms and minimizing operational complexity despite adding a component.
3Reliability
If the closure arm is kept strongly locked in closed position, then load retention is secure, but manual manipulation becomes difficult and risky
Solution Approach 1:
The patent extracts the manual manipulation function from the main closure arm by introducing a separate finger element. The finger element can be easily opened manually when needed for load insertion, while the main closure arm remains strongly locked for load retention. This separation takes out the manipulation complexity from the primary locking mechanism.
Solution Approach 2:
The finger element is designed with dynamic characteristics - it can be easily opened manually when needed and automatically closes through spring force when released. This dynamic behavior provides ease of operation for load insertion while maintaining secure closure during lifting, resolving the contradiction between strong locking and easy manipulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The finger element ensures the hook remains closed during all operational phases, enhancing safety and reducing the risk of load loss, even when the lever is open, and allows for safer and easier handling of the lifting gear.
Implementation Method 1
a spring-loaded finger element pivotably mounted at the upper part of the hook body to maintain the hook opening closed
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
A self-locking lifting hook is disclosed, of the kind having and arcuate hook body (1) and an upper, pivotable lever (5) with one arm forming a suspension means (7) and a second arm (8) forming a closure means for the hook opening (10) . A finger element (13) is pivotably mounted at the upper part of the hook so as to close the hook opening (19), under the influence of a spring means (14) , irrespective of the pivotal position of the lever (5) .