Load Pin with Spring Retention for Rigging
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Solution Overview
Problem
Existing load pin securing methods in rigging are cumbersome, time-consuming, and prone to losing or misplacing loose components, requiring multiple steps for secure engagement and disengagement.
Innovation Solution
A load pin with multiple retention features that require two separate motions to unlock, combining linear and rotary motions for secure locking and unlocking, with optional additional motions for enhanced security, and the use of retention features that prevent the pin from being dropped or lost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional load pin securing methods (cotter pin, cap screw with lock nut) are used, then the load pin can be secured in position, but the securing and removing process becomes cumbersome and time-consuming
Solution Approach 1:
The patent combines multiple retention features (spring mechanism, locking lugs, notches) into a single integrated load pin assembly. The spring-loaded lugs automatically engage with clevis pockets to secure the pin, while requiring two simultaneous motions (linear extraction + rotation) for removal. This merging eliminates the need for separate cotter pins or cap screws, reducing the number of steps while maintaining secure retention.
2Reliability
If traditional load pin securing methods are used, then the load pin can be retained, but multiple separate components may be dropped or misplaced during the process
Solution Approach 1:
The patent integrates the spring mechanism, locking lugs, and retention features directly into the load pin structure itself. The spring-loaded lugs are formed as integral parts of the pin, and the clevis pockets are molded into the clevis halves. This integration reduces the system to essentially three main components (load pin, clevis, and handle) eliminating loose cotter pins, nuts, and washers that could be misplaced.
3Reliability
If traditional load pin securing methods are used, then the load pin can be secured, but the process is time-consuming
Solution Approach 1:
The spring-loaded lugs are pre-positioned and automatically engage with the clevis pockets as the load pin is inserted. The spring mechanism is pre-compressed during assembly, so that upon insertion, the lugs immediately snap into the pockets without requiring additional securing steps. For removal, the two-motion requirement (linear pull + rotation) is designed to be quickly executed by the operator, reducing overall cycle time.
4Ease of operation
If multiple retention features requiring two separate motions are implemented, then the load pin can be quickly secured and released, but the mechanism becomes more complex
Solution Approach 1:
The spring-loaded lugs automatically perform the retention function without operator intervention once the load pin is inserted. The spring mechanism self-compresses and self-locks as the pin is inserted, with the lugs snapping into the clevis pockets automatically. The two-motion removal requirement (linear pull to compress spring, then rotation to disengage lugs) provides secure retention while remaining simple to operate.
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 solution provides a quick and efficient method for securing and releasing the load pin, reducing the risk of loss and allowing for numerous locking/unlocking cycles without hardware replacement, while ensuring secure retention and easy manipulation.
Implementation Method 1
a spring that applies a force in the unlocking direction and that is compressed when the load pin is in the locked position
Implementation Method 2
the friction between the pin and the clevis is sufficient to retain the load pin in the locked position
Data Source
AI summary
A load pin and clevis joint for joining two or more mechanical components together. The load pin includes a retention feature that requires two separate motions to unlock the pin. In a locked state, the load pin is secured across both halves of a clevis joint so that it completely spans an open span between the two clevis halves. In the preferred embodiment, the two motions required to unlock the load pin are (1) moving the load pin linearly; and (2) rotating the load pin.