Shackle Locking Pin Mechanism for Vibration-Secure Retention
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Solution Overview
Problem
Shackle load pins frequently fail to remain securely fastened, leading to unintended release and potential hazards such as equipment damage or human injury, especially in applications involving extended durations and high loads.
Innovation Solution
A shackle apparatus featuring a body with a bow portion and end portions, where a pin is configured to fit through pin openings, and a nut with locking balls engages with the pin for secure retention, allowing for easy installation and removal without special tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pin retention methods (nuts, cotter pins, retaining clips) are used, then the shackle can be assembled and disassembled, but the pin frequently fails to remain securely fastened under vibration and movement
Solution Approach 1:
The retention system is segmented into multiple independent locking elements (first retaining element, second retaining element, third retaining element) distributed at different locations on the pin. This segmentation ensures that if one retaining element fails or becomes loose, other elements continue to provide retention, thereby improving overall reliability without complicating the assembly process
Solution Approach 2:
The retaining elements are pre-installed on the pin before the pin is inserted into the shackle body. This preliminary action ensures that the retention mechanism is already in place and properly positioned, eliminating the need for complex post-installation securing operations and reducing the risk of improper installation
2Reliability
If multiple retaining devices (nut, cotter pin, retaining clip) are used to secure the pin, then retention reliability improves, but the device complexity increases
Solution Approach 1:
Multiple retention functions are merged into a single integrated pin structure. The first, second, and third retaining elements are all part of the same pin component rather than separate devices, simplifying the overall system while maintaining multi-point retention for improved reliability
Solution Approach 2:
The pin serves multiple functions simultaneously: it connects the shackle links together, provides structural support, and incorporates multiple retaining elements for secure fastening. This multi-functionality eliminates the need for separate retention devices, reducing device complexity while maintaining reliability
Data Source
AI summary
A shackle having a body with a bow portion, and first and second end portions. Each end portion having a pin opening. A pin is configured to fit through the pin openings, and a nut is configured with at least one locking ball to engage with the pin. A method of operating the shackle.