Firearm Anti-Rattle Biasing Device for Receiver Stability
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Solution Overview
Problem
The rattling between upper and lower receiver groups in firearms, caused by manufacturing tolerances and wear, is perceived as a sign of poor quality and can affect shooting accuracy, despite having no impact on functionality or safety.
Innovation Solution
A biasing device is integrated into the lower receiver group, featuring a spring and plunger mechanism that compresses to exert opposing forces on the upper and lower receivers, reducing or eliminating rattling by ensuring proper contact between mating components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If plastic inserts are used to reduce rattling, then rattling between receivers is reduced, but manufacturing precision and assembly complexity increase
Solution Approach 1:
The patent uses a plastic insert that can be easily trimmed and replaced if needed, rather than requiring precision machining of metal components. The plastic insert serves as a sacrificial element that absorbs the need for high manufacturing precision.
Solution Approach 2:
The patent changes the material parameter from metal to plastic, which allows for easier trimming and adjustment. The plastic material can be readily removed or shaped to achieve the desired fit without requiring high-precision manufacturing equipment.
2Object-affected harmful factors
If plastic inserts are trimmed to precise dimensions, then rattling is reduced, but assembly process complexity increases
Solution Approach 1:
The patent extracts the anti-rattle function from the main receiver assembly process by using a separate plastic insert that is trimmed and installed independently. This separates the precision trimming operation from the main assembly process.
Solution Approach 2:
The plastic insert is trimmed to the required dimensions before installation into the receiver assembly. This preliminary trimming action prepares the insert in advance, making the actual assembly process simpler and more straightforward.
3Strength
If metal receivers are used, then structural strength is maintained, but rattling occurs due to manufacturing tolerances and wear
Solution Approach 1:
The patent combines metal receivers with a plastic insert to create a composite structure. The metal provides structural strength while the plastic insert eliminates rattling by filling gaps and providing friction-based damping.
Solution Approach 2:
The plastic insert acts as an intermediary element between the metal receivers, mediating the contact surfaces to eliminate rattling while allowing the metal-to-metal structural connection to remain intact.
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 biasing device automatically generates a force that inhibits back-and-forth movement between the receivers, eliminating rattling without additional user action or adjustment, thereby enhancing the perceived quality and accuracy of the firearm.
Implementation Method 1
a spring configured to compress when the upper receiver is mated with lower receiver, and to exert opposing forces on the upper receiver and the lower receiver in response to the compression of the spring
Data Source
AI summary
An anti-rattling biasing device for firearms includes a spring configured to exert a biasing force against an upper receiver and a lower receiver of the firearm. The biasing force urges the upper and lower receivers firmly into contact with the pins that couple the upper and lower receivers, inhibiting small back and forth movement between the upper and lower receivers and thereby reducing or eliminating rattling of the upper and lower receivers when assembled together.