Clevis Pin With Spring-Loaded Plunger Locking
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Solution Overview
Problem
Traditional clevis pins often require tools for application and can be insecure, prone to inadvertent release, and may cause damage due to snagging or sharp edges, especially in limited access conditions or low light environments.
Innovation Solution
A clevis pin system with a slotted head and internal spring-loaded plunger mechanism that allows secure locking and unlocking without tools, featuring a smooth and non-protuberant design to prevent snagging and injury, using a cap and plunger assembly that can be easily fitted and removed without tools, and a cotter pin substitute with a circumferential groove for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cotter pins or locking mechanisms are used, then the clevis pin is secured against release, but tools are required for application and removal
Solution Approach 1:
The clevis pin system features a self-locking mechanism where the pin automatically engages with the clevis through a deformable locking element that bends upon insertion, securing the pin without requiring tools for application or removal. The user simply inserts the pin and it locks itself into place.
Solution Approach 2:
The locking element transitions from a flexible state during insertion to a rigid locked state, allowing the mechanism to adapt during installation. The deformable nature of the locking element enables tool-free operation while maintaining secure locking.
2Ease of operation
If prominent heads or sharp edges are used on clevis pins, then the pin is easier to grip and install, but snagging may cause inadvertent release or damage to contacting objects
Solution Approach 1:
The clevis pin features a rounded, non-protuberant head design that eliminates sharp edges and prominent features. The curved surface prevents snagging on surrounding objects while still allowing sufficient grip for installation and removal operations.
Solution Approach 2:
The geometric parameters of the pin head are optimized to provide adequate grip surface area while maintaining a low-profile, rounded shape that minimizes snagging risk. The head dimensions are carefully selected to balance operability with safety.
3Reliability
If grooved designs with retaining rings are used, then the pin can be secured, but tools are required for removal and the mechanism becomes more complex
Solution Approach 1:
The complex retaining ring and groove mechanism is replaced by a simpler deformable locking element that integrates directly with the pin body. This extraction of unnecessary components simplifies the overall structure while maintaining reliable securing functionality.
Solution Approach 2:
The locking function is merged into the pin itself through the deformable locking element, eliminating the need for separate retaining rings or grooves. The pin and locking mechanism become an integrated unit, reducing structural complexity.
4Ease of operation
If spring loaded or retractable detent ball mechanisms are used, then tool-free operation is achieved, but critical working length or diameter is required and external pressure may cause unlocking
Solution Approach 1:
The locking mechanism is segmented into distinct functional zones: the deformable locking element, the engagement features on the clevis, and the pin body. This segmentation allows the locking element to be optimized for pressure resistance while maintaining tool-free operation through its deformable nature.
Solution Approach 2:
The deformable locking element is designed with inherent flexibility to absorb and distribute external compressive forces before they can propagate to the locking interface. This beforehand cushioning prevents external pressure from causing unintended unlocking.
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 system provides secure and tool-free operation, preventing inadvertent release and damage, while being easy to use in confined or low-light conditions, maintaining the robustness of a cotter pin without critical dimensions and minimizing snagging risks.
Implementation Method 1
internal spring-loaded plunger mechanism
Data Source
AI summary
A device comprising a shaft and a fastener. The device requires substantially no tools to apply while generally maintaining the basic shape of a common clevis pin and the robustness of a common cotter pin. The fastener passes through a bore hole in the shaft. A cap positions onto a shaft head, and includes a ridge that engages a slot in the shaft head. The cap and head have low profiles and are non-protuberant, so as to minimize snagging, inadvertent release, and/or damage to contacting objects. A plunger positions inside the shaft, passing through a plunger spring. The plunger spring provides a compressive force that presses against the fastener to hold it in place. Removing the cap reduces the compressive force. The shaft cannot be released by external pressure on the shaft head. A compressive element helps secure the fastener in a shaft cross bore.