Telescoping Magazine Spring With Variable Pitch Force Control
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Solution Overview
Problem
Traditional magazine springs, particularly stacked coil springs, face limitations in minimizing solid height while maintaining sufficient spring force to load ammunition efficiently, often resulting in excessive force that impedes loading and can cause firearm malfunctions, and fail to provide a consistent spring rate for constant force delivery.
Innovation Solution
A telescoping spring design with a continuous wire member forming coils of varying pitch and radius along a central axis, where each coil has straight and curved portions, allowing for a variable spring rate and reduced solid height, with the first spring body having a decreasing pitch and the second body having an increasing pitch, enabling a combined height of twice the wire diameter in the compressed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional stacked coil spring is used to maximize ammunition capacity, then the solid height is minimized, but the spring rate becomes excessive and impedes loading
Solution Approach 1:
The spring is divided into two distinct spring bodies with different pitch characteristics. The first spring body has a decreasing pitch that provides a softer spring rate, while the second spring body has an increasing pitch that provides a stiffer spring rate. This local differentiation allows the spring to provide appropriate force characteristics at different compression stages, resolving the contradiction between maximizing capacity and controlling force.
Solution Approach 2:
The continuous wire spring is segmented into two functional spring bodies connected end-to-end. The first spring body handles the initial compression with decreasing pitch for softer force, while the second spring body handles final compression with increasing pitch for stiffer force. This segmentation allows independent optimization of force characteristics for each stage of compression.
2Quantity of substance
If the spring is fully compressed to maximum capacity, then ammunition capacity is maximized, but excessive force causes firearm malfunctions
Solution Approach 1:
Different sections of the spring provide different force characteristics tailored to specific compression stages. The first spring body with decreasing pitch provides softer force for initial loading, while the second spring body with increasing pitch provides controlled force for final compression, ensuring reliable operation even when fully loaded.
3Ease of manufacture
If the pitch between coils is fixed, then manufacturing is simplified, but the spring rate cannot be controlled to provide constant force
Solution Approach 1:
The spring employs variable pitch within each spring body rather than a uniform pitch throughout. The first spring body has pitch that decreases from first to second end, while the second spring body has pitch that increases from first to second end. This local variation in pitch allows precise control of the spring rate to maintain constant force delivery while remaining manufacturable from continuous wire.
4Force
If the spring free length is increased to provide sufficient loading force, then the spring can load all ammunition rounds, but the solid height increases and reduces magazine capacity
Solution Approach 1:
The spring utilizes variable pitch parameters along its length to optimize performance. By having pitch decrease in the first spring body and increase in the second spring body, the spring achieves the required free length for sufficient loading force while minimizing the solid height when compressed, thereby maximizing magazine capacity.
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
This design enhances the compression capability and control of spring force, allowing for a higher number of ammunition rounds to be loaded without excessive force issues, improving the reliability of firearm magazine springs by providing a consistent and controlled spring rate.
Implementation Method 1
a spring comprising a continuous wire member formed into a plurality of coils along a central axis
Data Source
AI summary
A spring comprises a continuous wire member formed into a plurality of coils along a central axis. Each of the plurality of coils comprises a plurality of straight portions extending between bend portions each extending from one of the straight portions. The plurality of coils form a first spring body and a second spring body, each spring body comprising at least three coils and having a first end and a second end with the first end of the second spring body connected to the second end of the first spring body. In an unloaded state the first spring body has a first unique pitch distance between bend portions of each pair of adjacent coils and the first unique pitch distance decreases from the first end of the first spring body to the second end of the first spring body, and the second spring body has a second unique pitch distance between bend portions of each pair of adjacent coils and the second unique pitch distance increases from the first end of the second spring body to the second end of the second spring body.