Side Lock Action Firearm Drawbolt Stock Mounting
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Solution Overview
Problem
Conventional side lock action firearms experience issues with the stock compressing irregularly and tang engagement screws backing off over time, leading to a loose fit between the stock and tangs, affecting appearance and accuracy.
Innovation Solution
A side lock action firearm with a frame featuring a rearwardly protruding threaded boss and a stock with a central bore, where the draw bolt is received by the bore, providing a flush fit and secure engagement without vertical compression of the stock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional side lock action with tang engagement screws is used, then the stock can be mounted to the receiver, but the screws tend to back off over time causing the fit to loosen
Solution Approach 1:
The patent replaces the screw-based mechanical fastening system with a drawbolt system that uses a threaded boss and nut arrangement. The drawbolt passes through the stock and engages with the threaded boss on the tang, eliminating the need for engagement screws that can back off. This substitution provides more reliable and durable mounting while maintaining the side lock action aesthetic.
Solution Approach 2:
The patent incorporates a threaded boss that is pre-formed on the tang, allowing the drawbolt to engage directly with the threading. This preliminary preparation of the mounting interface ensures consistent and secure attachment without requiring separate engagement screws that could loosen over time.
2Strength
If conventional side lock action compresses stock between tangs, then the stock can be secured, but the wood compresses irregularly causing loss of flush fit
Solution Approach 1:
The patent extracts the compression function from the tang engagement system. Instead of compressing the stock between tangs using screws, the drawbolt system applies localized threading engagement that secures the stock without causing irregular compression. The drawbolt pulls the stock forward to engage the threaded boss, eliminating the compression issue while maintaining secure attachment.
Solution Approach 2:
The patent applies the threading engagement locally at the threaded boss on the tang rather than distributing compression forces across the stock. This localized engagement point provides secure attachment without causing irregular compression across the wood grain, preserving the flush fit between the stock and tangs.
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
The solution ensures a consistent, flush fit between the stock and tangs, enhancing the shotgun's appearance and maintaining strength and accuracy by preventing screws from backing off.
Implementation Method 1
The rearwardly protruding portion includes a mating feature, such as a threaded boss. The stock includes a mating element, such as a draw bolt, removably connected to the frame when the mating element is engaged with the mating feature.
Data Source
AI summary
A side lock action firearm has a frame with an attached side lock action. The frame includes a rearwardly protruding portion including a mating feature. A stock including a mating element is removably connected to the frame when the mating element is engaged with the mating feature. The mating feature may be a threaded boss. The mating element may be a draw bolt. A forward portion of the stock may be shaped to closely receive the rearwardly protruding portion of the frame. The stock may include a central bore, and the draw bolt may be received by the central bore in the stock.