Firearm Stock Assembly with Spring-Loaded Butt and Wedge Limiter
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Solution Overview
Problem
Existing adjustable length stocks for firearms are difficult to manipulate, requiring two hands and limiting the user's ability to quickly and consistently adjust the stock to a desired length.
Innovation Solution
A stock assembly with a base and a butt portion that can be adjusted in length, featuring an adjustment limiter that automatically stops at a predetermined length, a lock for securing the position, and a bias element for rapid extension, allowing for one-handed operation and consistent length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional adjustable stock uses a pin and sliding portion mechanism, then the stock can be adjusted in length, but it requires two hands to manipulate and cannot be adjusted quickly
Solution Approach 1:
The stock assembly uses a spring-loaded butt portion that automatically extends to the extended position when the lock is released, eliminating the need for manual sliding. The system serves itself by using stored spring energy to perform the adjustment action that would otherwise require user effort, enabling one-handed operation and rapid adjustment.
Solution Approach 2:
The spring is pre-compressed and stores energy in advance, ready to propel the butt portion to the extended position when needed. This preliminary action of compressing the spring during manufacturing or initial setup allows for rapid adjustment without requiring the user to manually move the stock during operation.
2Adaptability or versatility
If the stock is made fixed and non-adjustable, then the structure is simpler, but it cannot accommodate users of different statures
Solution Approach 1:
The stock is divided into two main segments: a fixed base portion and a movable butt portion. This segmentation allows the stock to be adjusted in length while maintaining structural integrity. The base portion remains stationary and attached to the firearm, while the butt portion can extend or retract, providing adaptability without requiring complete redesign of the entire stock structure.
Solution Approach 2:
The stock transitions from a static, fixed structure to a dynamic, adjustable structure by introducing a movable butt portion that can change length. The spring mechanism enables the butt portion to dynamically extend or retract based on user needs, while the lock provides stability when a specific length is selected. This dynamic capability allows the stock to adapt to different users without requiring multiple fixed-length stocks.
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
Enables rapid and efficient adjustment of the stock assembly to fit individual statures, allowing users to quickly deploy the stock to a custom length, improving usability and consistency.
Implementation Method 1
The spring can be under compression and with its stored energy, can push the butt portion away from a first end of the base that attaches to the weapon, thereby extending the stock assembly.
Data Source
AI summary
A stock assembly and related method are provided. The stock assembly can include a base that can be joined with a weapon and a butt portion that movably extends from the base so the stock assembly can be adjusted in length. The stock can include an adjustment limiter configured to stop extension of the butt portion at a predetermined length, which can be set by a user to fit their stature. The butt portion can include a longitudinal axis and a limiter surface offset at an angle relative to the axis. The adjustment limiter can be a wedge that wedges against the limiter surface to set the stock assembly at the predetermined length, thereby automatically setting that length in a consistent and repeatable manner. A lock, separate from the adjustment limiter, can selectively lock the butt portion in a fixed position as or after the stock assembly attains the predetermined length.