Folding Buttstock with Bisected Buffer Tube for Compact Storage
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Solution Overview
Problem
There is a challenge in compactly storing firearms with direct gas impingement systems, such as M-16/AR-15/AR-10 types, as existing mechanisms do not allow for a folding stock that accommodates the recoil assemblies within the buttstock.
Innovation Solution
A folding buttstock design that bisects the buffer tube with a hinge, allowing the buffer and recoil spring to be retained within the stock when folded, and includes a manually operated hinge release mechanism to control the folding and retention of the buffer tube, enabling the bolt carrier to bear against the buffer spring without being physically attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a folding stock is implemented in a direct gas impingement system, then the firearm becomes more compact for storage and transport, but the recoil assembly cannot be properly accommodated within the folded stock
Solution Approach 1:
The buffer tube is divided into two segments that can fold relative to each other via a hinge mechanism. The first segment attaches to the receiver and the second segment folds downward, allowing the stock to collapse into a compact configuration while maintaining the ability to accommodate the recoil assembly in either extended or folded position
Solution Approach 2:
The recoil assembly (buffer and spring) is nested within the buffer tube structure, which itself is integrated into the folding stock. When the stock is folded, the recoil assembly remains contained within the folded buffer tube configuration, effectively nesting the recoil components within the compact stock structure
2Ease of operation
If the buffer tube is made foldable with a hinge, then the stock achieves compact folding capability, but the buffer and spring may not be securely retained within the folded stock
Solution Approach 1:
A retainer mechanism acts as an intermediary component between the buffer tube and the buffer/spring assembly. This retainer positively engages with the buffer, securing it within the buffer tube whether the stock is in the extended or folded position, thereby maintaining reliability during folding operations
Solution Approach 2:
The hinge mechanism provides dynamic folding capability while the retainer mechanism dynamically adapts to secure the buffer in both extended and folded configurations. The system transitions smoothly between states while maintaining secure retention of the recoil assembly throughout the motion range
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 enables the compact storage and transport of M-16 style rifles by retaining the recoil assemblies within the folded stock, allowing for a folding stock assembly that functions with direct gas impingement systems, enhancing storage convenience without compromising the firearm's operation.
Implementation Method 1
The rear of the bolt carrier assembly bears against a recoil buffer and associated spring which are contained within the buffer tube, buttstock, or a receiver extension. When the bolt travels rearward, it compresses the buffer spring; it is this force combined with the weight of the buffer which slows, and then stops, the bolt carrier assembly's rearward movement.
Implementation Method 2
The innovation provides a device that bisects the buffer tube by providing a hinge therebetween.
Data Source
AI summary
An innovative design described in this application retains the buffer and recoil spring within the folded portion of the buttstock or buffer tube so the stock can fold. There are alternative ways to retain the buffer and recoil spring within a folded buttstock. The bolt carrier is not physically attached to the buffer and recoil spring. A folding stock assembly which contains the buffer and buffer spring within the folded portion of the stock for a firearm that uses a direct gas impingement system.