Firearm Bolt Retaining Device for Thermal Management
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Solution Overview
Problem
Automatic and semi-automatic firearms with closed-bolt designs face challenges in heat dissipation, leading to potential thermal detonation risks due to higher component temperatures and prolonged chambering of ammunition, necessitating a method to selectively retain the bolt in an open position for extended periods.
Innovation Solution
A retaining device with a mounting plate and retention pin system that securely engages the bolt assembly, allowing it to be maintained in a substantially-fixed open position for indeterminate times, featuring axial displacement of the retention pin between engaged and disengaged positions to manage bolt assembly movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If closed-bolt design is used, then accuracy is improved, but heat dissipation deteriorates leading to higher component temperatures
Solution Approach 1:
The patent applies a dynamic retention system where the bolt can be selectively held in either forward or rearward position through a retention device. This allows the system to adapt between closed-bolt (high accuracy) and open-bolt (heat dissipation) configurations based on operational needs, resolving the contradiction between accuracy and heat management
2Measurement precision
If closed-bolt design is used, then accuracy is improved, but thermal detonation risk increases due to prolonged ammunition chambering
Solution Approach 1:
The retention device enables dynamic switching between closed and open bolt positions, allowing operators to minimize ammunition chambering time and reduce thermal detonation risk while maintaining closed-bolt accuracy when needed
Solution Approach 2:
The retention device acts as an intermediary mechanism that decouples the relationship between firing and bolt position, allowing ammunition to be chambered without immediately requiring the bolt to remain closed, thus reducing thermal detonation risk
3Temperature
If manual retention methods are used, then heat dissipation is improved, but operational complexity increases
Solution Approach 1:
The retention device is self-contained and self-operating, requiring no external tools or complex mechanisms. The operator simply manipulates the retention handle to engage or disengage the bolt retention, making the system easier than manual methods while maintaining effective heat dissipation
Data Source
AI summary
Retaining devices securable on firearms are selectively operable to engage and retain a bolt assembly in a substantially-fixed position for an indeterminate period of time. The retaining devices include a mounting plate securable to the receiver and a retention pin that extends through a passage in the mounting plate. The retention pin extends axially between first and second ends that project outwardly beyond the mounting plate. The retention pin is supported on the mounting plate for axial displacement between a first pin position and a second pin position. In the first pin position, the second end of the retention pin engages and retains the bolt assembly in a substantially-fixed position relative to the receiver. In the second pin position, the second end of the retention pin is disengaged from the bolt assembly.