Clevis Hook Load Pin Retention Using Integrated Axial Obstruction
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Solution Overview
Problem
Existing clevis hook assemblies lack an effective and efficient retention mechanism for load pins, which can lead to slippage and safety concerns during lifting operations, necessitating an improved design for both manufacturing and user safety.
Innovation Solution
A clevis hook assembly with a pair of opposed members featuring cylindrical openings for the load pin, where a spring pin or knurled plug is used to obstruct the load pin's axial movement, combined with a reduced diameter section in one of the members to prevent further insertion, ensuring secure attachment to a crane or hoist wire or rope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring pin or retaining pin is inserted into a transverse retaining hole to obstruct the load pin, then the load pin is prevented from sliding out of the opposed members, but the device complexity increases due to additional components and assembly steps
Solution Approach 1:
The patent combines the retention function with the opposed members themselves by forming recesses directly in the opposed members that receive and retain the load pin. This eliminates the need for separate retaining pins or spring pins, merging multiple functions into the primary structural components.
Solution Approach 2:
The patent removes the separate retaining pin or spring pin components from the assembly, extracting the retention function and integrating it directly into the opposed members through recesses. This simplifies the overall device by eliminating unnecessary intermediate components.
2Reliability
If a reduced diameter section is provided in one of the opposed members to prevent further insertion of the load pin, then the load pin is securely retained at the correct position, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing recesses with specific dimensional characteristics at particular locations in the opposed members. The recesses have defined depths and cross-sectional areas that are optimized for their specific retention function, rather than requiring uniform high precision throughout the entire component.
3Reliability
If traditional retaining mechanisms with multiple components are used, then the load pin can be retained, but the ease of manufacture decreases due to more parts and assembly steps
Solution Approach 1:
The patent merges the retention function into the opposed members themselves through integrally formed recesses, eliminating the need for separate retaining pins, spring pins, or transverse retaining holes. This reduces the total part count and simplifies both manufacturing and assembly processes.
Solution Approach 2:
The patent extracts and eliminates unnecessary intermediate components (retaining pins, spring pins) from the traditional retention mechanism, keeping only the essential opposed members with integrated recesses. This streamlines the manufacturing process and reduces assembly complexity.
Data Source
AI summary
A retaining mechanism for a clevis hook assembly with an axial device that provides a retaining mechanism for a load pin. The axial device is disposed inside a first opening behind the load pin. The axial device may provide a retention mechanism to obstruct the load pin when the load pin is inserted into the first opening of one of the pair of opposed members and extends across a space into the first opening in the other opposed member.