Adjustable Firearm Stock Rack-and-Pinion Adjustment Without Grip Loss
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Solution Overview
Problem
Conventional adjustable stock systems for weapons require users to remove their hand from the weapon to actuate the movable component, leading to loss of grip, sight picture, and control.
Innovation Solution
An adjustable stock system with a rack and pinion assembly that includes a gear biased by a constant force spring to extend the buttpad, and a rack stop to hold the assembly in place, allowing adjustment without hand removal, featuring an ambidextrous actuator for easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional adjustable stock systems are used, then the stock length can be adjusted, but the user must remove their hand from the weapon causing loss of grip, sight picture, and control
Solution Approach 1:
The stock adjustment system allows the user to adjust the stock length using their own body (shoulder or chest) as the actuating force, eliminating the need to remove the hand from the weapon. The user simply presses their shoulder or chest against the buttpad to extend the stock or releases it to retract, making the system self-service and maintaining continuous weapon control.
Solution Approach 2:
The buttpad acts as an intermediary element between the user's body and the stock adjustment mechanism. By pressing against the buttpad, the user transfers force through the rack and pinion assembly to adjust the stock length without needing to manually manipulate traditional adjustment levers or buttons that would require hand removal from the weapon.
2Ease of operation
If the buttpad is biased toward extended position by spring, then the stock automatically extends, but additional components are added to the system
Solution Approach 1:
The stock adjustment system transitions from a static, manually-operated mechanism to a dynamic system that automatically responds to user body movements. The spring-biased rack and pinion assembly continuously adapts the stock length based on whether the user is shouldering the weapon or carrying it, eliminating the need for discrete adjustment steps or manual intervention.
Solution Approach 2:
The invention replaces traditional mechanical adjustment mechanisms (levers, buttons, or set screws requiring manual operation) with a spring-biased rack and pinion system that uses elastic potential energy storage and release to automatically adjust the stock. This substitution eliminates complex multi-component adjustment mechanisms while achieving the same functional goal.
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 seamless adjustment of the stock length without losing grip or sight picture, maintaining weapon control, and accommodating both left- and right-handed users.
Implementation Method 1
The gear can be biased to urge the rack to the extended position by a constant force spring mounted within the mounting box.
Implementation Method 2
The moveable assembly comprises, at least, a rack and pinion assembly configured to bias a buttpad toward an extended position
Data Source
AI summary
In accordance with at least one aspect of this disclosure, an adjustable stock system for weapons and/or other suitable devices incudes an adjustable stock, a mounting box defining an interior cavity and a mounting feature configured to mount the adjustable stock to a device, and a moveable assembly including one or more moveable components configured to move relative to the mounting box. The moveable assembly comprises, at least, a rack and pinion assembly configured to bias a buttpad toward an extended position, and a rack stop configured to hold the rack and pinion assembly in place at a desired position.