Firearm Stock Adjustable Butt Plate and Comb Locking Assembly
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Solution Overview
Problem
Existing firearm stocks with adjustable butt plates and combs often suffer from slop and movement issues, leading to inconsistent shooting performance due to inadequate adjustment methods, which can affect the shooter's ability to achieve repeatable accuracy and comfort.
Innovation Solution
The design incorporates a stock with an adjustable length of pull and comb height, utilizing a locking assembly with a cam lever and chamfered edges to securely engage the butt plate and comb, providing a rigid and adjustable system with minimal translational or rotational movement, ensuring precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional adjustable butt plate and comb system is used, then the firearm stock can be adjusted for length of pull and comb height, but slop and movement occur leading to inconsistent shooting performance
Solution Approach 1:
The butt plate and comb are divided into separate adjustable components that can be independently positioned and locked. The butt plate includes a tongue with multiple positions, and the comb is separable from the cheek plate, allowing each component to be adjusted and secured independently to eliminate movement while maintaining adaptability.
Solution Approach 2:
The system transitions from a fixed stock design to a dynamically adjustable one where the butt plate and comb can be repositioned. The locking mechanism allows the components to be moved to desired positions and then secured, providing both adjustability and stability when locked in place.
2Reliability
If a locking assembly with cam lever is used to secure the butt plate and comb, then movement and slop are reduced, but the device complexity increases
Solution Approach 1:
The cam lever locking mechanism is designed to be self-locking, where the cam action automatically secures the butt plate and comb in place without requiring additional fasteners or complex locking procedures. The user simply positions the components and engages the cam lever, which self-secures the adjustment.
Solution Approach 2:
Traditional multi-component locking mechanisms (screws, nuts, washers) are replaced with a cam-based mechanical system. The cam lever provides a simple rotational motion that translates into secure locking action, reducing the number of parts and simplifying the overall locking assembly while maintaining reliability.
3Measurement precision
If the comb is made adjustable with posts and cheek plate, then comb height can be optimized for repeatable positioning, but the manufacturing complexity increases
Solution Approach 1:
The comb assembly is segmented into the comb, cheek plate, and posts as separate components that can be manufactured independently using standard machining processes. This segmentation allows each part to be produced with conventional methods and then assembled, balancing precision requirements with manufacturing ease.
Solution Approach 2:
The posts serve multiple functions: they provide structural support for the comb, enable height adjustment by varying post length or position, and act as locking elements when engaged with the cheek plate. This multi-functionality reduces the need for additional specialized components, simplifying manufacturing while achieving precise adjustment capability.
Data Source
AI summary
A firearm stock with adjustable length of pull and/or comb height is disclosed. In one example, a butt plate assembly includes a tongue defining top and bottom chamfered outside edges. A stock body defines top and bottom chamfered inside edges along a slot opening. Moving a locking assembly to a locked position draws the chamfered outside edges on the tongue against the chamfered inside edges along the slot opening. A locking plate can be used between the fastener and the tongue. In another example, an adjustable comb assembly includes a cheek plate with posts received in post openings that extend into the stock body. A locking lever is coupled to a fastener that extends laterally through the stock body. Moving the lever to the locked position draws together opposite sides of the stock body to constrain the post openings, thereby retaining the position of the comb.