Pin Removal Tool Notch Mechanism for Controlled Trigger Pin Extraction
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Solution Overview
Problem
The existing methods for removing pins from mechanical devices, such as firearms, using pin punches are inefficient and prone to pin deformation, as the pin can be propelled out of sight during removal and require repeated impacts, leading to potential damage.
Innovation Solution
A pin removal tool with a projection extending from a handle, featuring a notch at the head that engages the pin, allowing for controlled partial unseating and removal without the need for repeated impacts, made from a softer material than the pin to prevent deformation, and manufactured through stamping or bending processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pin punches are used with repeated impacts to remove pins, then pins can be removed from their recess, but pins may be propelled out of view and become difficult to find, and pins may be deformed over time
Solution Approach 1:
The patent introduces a pin removal tool as an intermediary device between the user and the pin. This tool includes a handle, a projection that contacts the pin end, and a notch that engages the pin body. The intermediary tool provides controlled force application and pin retention, preventing the pin from being propelled out of view while eliminating the need for repeated impacts that cause deformation.
Solution Approach 2:
The pin removal tool is segmented into distinct functional components: a handle for user grip, a projection for contacting and pushing the pin end, and a notch for engaging and retaining the pin body. This segmentation allows each component to perform its specific function, enabling controlled pin extraction without deformation or loss of controllability.
2Ease of operation
If pin punches are used to remove pins, then pins can be extracted from their position, but the pin may be propelled out of the user's view making it difficult to find
Solution Approach 1:
The pin removal tool serves as a mediator that maintains visual contact with the pin throughout the removal process. The notch in the tool engages the pin body and retains it within the tool's structure, preventing the pin from being propelled away. This allows the user to maintain control and visibility of the pin during extraction, eliminating the problem of pin loss or difficulty in locating the pin after removal.
3Productivity
If repeated impacts are applied to remove pins, then pins can be forced out of their recess, but pins tend to deform over time
Solution Approach 1:
The pin removal tool acts as a controlled intermediary that distributes force evenly across the pin through its projection and notch structure. Instead of concentrated impact forces that cause deformation, the tool provides sustained, distributed pressure that gradually extracts the pin while maintaining its dimensional integrity. The softer material of the tool compared to the pin further prevents deformation during the removal process.
Solution Approach 2:
The patent changes the force application parameters from repeated high-impact forces to sustained lower-pressure forces. The projection pushes against the pin end while the notch engages the pin body, creating a controlled force distribution that extracts the pin without deformation. This parameter change from impact to pressure eliminates the harmful effects of repeated striking while maintaining removal effectiveness.
Data Source
AI summary
A method of removing a trigger assembly from a firearm includes placing a projection of a pin removal tool against a first end of a trigger pin of a firearm. The projection of the pin removal tool extends from a first end of a handle of the pin removal tool. The projection is then pushed against the pin so as to cause the pin to partially unseat from its position within the firearm. The pin removal tool is then turned around and the head is engaged to the pin between the first end and a second end thereof via a notch of the head. The pin removal tool is pulled so that the trigger pin is removed from the firearm so as to release a trigger assembly which is at least partially held within the firearm by the trigger pin.