Pin Assist Assembly for Tool-Free Retaining Pin Extraction
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Solution Overview
Problem
Existing pin insertion and extraction devices, such as cotter pins, often require external tools for insertion and extraction, which can be cumbersome, especially in hard-to-reach locations, and are hindered by rust, making them difficult to manipulate without mechanical force.
Innovation Solution
A pin assist device with a flexible material attached to the pin, featuring a thicker insertion end and extraction end with a tapered middle section, providing a gripping element for easy insertion and extraction without tools, and a resilient material for improved grip and tension control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external tools are used for pin insertion and extraction, then the pin can be securely manipulated, but the operation becomes cumbersome especially in hard-to-reach locations
Solution Approach 1:
The assist device integrates multiple functions into a single tool that combines a gripping element for extraction with an insertion element for insertion. This merged device eliminates the need for separate external tools while providing both secure gripping and insertion capabilities, directly resolving the contradiction between reliable manipulation and ease of operation in hard-to-reach locations
Solution Approach 2:
The assist device is designed to be self-contained with all necessary functions integrated into one tool. The device serves itself by providing both gripping and insertion capabilities without requiring additional external tools, allowing users to perform both operations independently in difficult-to-access areas
2Strength
If rust develops on the retaining pin, then the pin can maintain structural integrity, but the pin binds to the shaft making extraction difficult
Solution Approach 1:
The assist device acts as an intermediary tool that provides mechanical advantage for extraction. By introducing this intermediate device between the user and the rusted pin, the system enables extraction of pins that have bound to the shaft due to rust, while the pin itself maintains its structural integrity through the rust formation
3Reliability
If the pin is located in a recessed location with limited access, then the pin can be securely retained, but the user's ability to insert and extract the pin is hindered
Solution Approach 1:
The assist device extends the user's reach into recessed areas by providing a long handle that operates in a different spatial dimension. This allows the user to access and manipulate pins in hard-to-reach locations without compromising the secure retention provided by the recessed geometry
4Ease of operation
If mechanical force is applied to remove the pin, then the pin can be extracted from the shaft, but the shaft may be damaged or the pin may become stuck
Solution Approach 1:
The assist device incorporates a spring mechanism that provides dynamic, controlled mechanical force for extraction. The spring delivers gradual increasing force that can overcome rust binding and friction without sudden impacts that could damage the shaft or cause the pin to become stuck, enabling extraction while maintaining component integrity
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
Enables users to easily insert and remove retaining pins from various structures, including hitch pins, without external tools, even in difficult locations and while wearing gloves, by providing a stable grip and adjustable tension.
Implementation Method 1
a resilient material for improved grip and tension control
Data Source
AI summary
A pin assist device that eliminates the need to use a separate tool to insert and/or extract a cotter, or other fastening, pin. The pin assist device allows the user to easily insert or extract a pin in locations that are difficult to reach, in all types of weather and virtually all conditions. The pin assists device may be removably attachable to the pin. Related pin assist devices, hitch pins, and hitch pin assemblies are also disclosed.