Firearm Shoulder Stock with Spring-Loaded Pin Adjustment
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Solution Overview
Problem
Existing firearm designs with adjustable shoulder stocks and receiver tubes lack a smooth and efficient mechanism for extending and retracting the stock without requiring continuous lever engagement, limiting user convenience and customization options.
Innovation Solution
A combination of a lever arm with a pivotal displacement and a plurality of axially spaced apertures in the receiver tube, featuring chamfered or sloped edges, allows for easy adjustment of the stock length by sliding the lever lug outwardly from each aperture without continuous lever depression, facilitated by a spring-loaded pin mechanism and stop screws for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional adjustable stock mechanism is used, then the stock can be adjusted to different positions, but the adjustment process requires continuous lever engagement and lacks smooth operation
Solution Approach 1:
The patent applies the dynamics principle by making the adjustment mechanism self-actuating through spring-loaded pins that automatically engage with apertures during stock extension or retraction. The spring pins are biased to engage with the nearest aperture without requiring continuous lever engagement, transforming a static engagement system into a dynamic one that automatically adapts during movement.
Solution Approach 2:
The spring-loaded pin mechanism performs self-service by automatically engaging with the appropriate aperture based on the stock's position during extension or retraction. The spring bias ensures the pin maintains engagement without requiring external actuation, allowing the mechanism to service itself during the adjustment process and eliminating the need for continuous lever engagement.
2Adaptability or versatility
If multiple adjustment positions are provided, then user customization options increase, but the mechanism for selecting positions becomes more complex
Solution Approach 1:
The patent applies segmentation by providing multiple discrete apertures in the receiver tube at different axial positions, each corresponding to a specific stock length position. This segments the continuous adjustment range into discrete, easily selectable positions, allowing users to choose from multiple pre-defined positions without requiring a complex continuous adjustment mechanism.
Solution Approach 2:
The spring-loaded pin automatically selects the appropriate aperture based on the stock's current position during extension or retraction. The spring bias ensures the pin engages with the nearest available aperture without requiring external selection input, allowing the mechanism to self-select positions and simplifying the user interaction despite multiple available positions.
3Ease of operation
If the stock can be extended and retracted smoothly, then user convenience improves, but the risk of overextension or improper positioning increases
Solution Approach 1:
The patent applies preliminary action by providing stop screws that are pre-positioned to limit the maximum extension of the stock. These stop screws are installed before use and automatically prevent the stock from extending beyond safe or functional limits, ensuring proper positioning is maintained throughout the adjustment process without requiring active user control.
Solution Approach 2:
The spring-loaded pin mechanism provides tactile feedback through engagement with the apertures, creating distinct engagement positions that indicate proper stock positioning. The spring bias ensures the pin maintains firm engagement with the selected aperture, providing sensory feedback to the user that the stock is properly positioned and preventing improper positioning through the mechanical constraint of the engagement system.
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 smoother and quicker adjustment of the firearm's length, providing users with customizable stock positions and preventing overextension, enhancing user convenience and firearm handling.
Implementation Method 1
spring-loaded pin mechanism
Data Source
AI summary
A combination receiver tube and adjustable stock for a firearm having a receiver. The receiver tube extends rearwardly from the receiver and includes a series of recessed locations formed along a length extending surface thereof, each of the recesses further including an ascending surface extending at an acute angle from the recessed location to an outer surface of the tube. The stock has a forward opening communicating with an open interior so that the stock is slidably mounted over the receiver tube to support axial movement of the stock relative to the tube. The stock includes a lug which is biased for seating within a first selected one of the recessed locations and, upon counter-biasing the lug to unseat from the recessed location, permitting the stock to be rearwardly extended from the receiver tube across consecutive recessed locations.