Shotgun Bolt Assembly Linear Feeding and Firing Pin Locking
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Solution Overview
Problem
Conventional shotguns face issues with firing pin locking mechanisms, forearm fastening mechanisms, magazine plug insertion, shotshell feeding mechanisms, and gas-operated actions, including complexity, reliability, and maintenance challenges such as gas leakage and dirty components.
Innovation Solution
The shotgun incorporates improved firing pin locking mechanisms without springs, simplified forearm fastening mechanisms, easy magazine plug insertion, and a gas-operated action with enhanced sealing to prevent gas leakage, featuring a bolt assembly that automatically moves shotshells from the magazine to the chamber without cycling the bolt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is used to bias the firing pin rearward, then the firing pin can be held in place during cycling, but the spring may break or lose its spring after heavy usage (6,000 to 10,000 cycles)
Solution Approach 1:
The patent removes the spring from the firing pin assembly entirely, replacing it with a direct mechanical constraint system where the bolt assembly itself provides the restraint force through its structure and movement characteristics, eliminating the spring as a separate component that can fail
Solution Approach 2:
The patent replaces the spring-based elastic mechanical system with a direct rigid mechanical constraint system where the bolt assembly's structure and motion directly control the firing pin position without intermediate elastic elements
2Reliability
If a rotary bolt design is used to lock the firing pin, then the firing pin can be restrained, but the receiver length increases and the design becomes more complex
Solution Approach 1:
The patent extracts the rotary motion requirement from the bolt assembly, using only linear reciprocating movement to achieve both firing pin restraint and shotshell feeding functions, eliminating the rotational mechanism and associated complexity
Solution Approach 2:
The patent makes the bolt assembly perform multiple functions simultaneously: restraining the firing pin during recoil, feeding shotshells from the magazine to the chamber, and locking the action, all through linear reciprocating motion without requiring separate rotational mechanisms
3Ease of operation
If the cap is completely removed to detach the forearm, then the forearm can be removed, but the cap may be easily lost and the process becomes time-consuming
Solution Approach 1:
The patent segments the cap removal process into two independent operations: first rotating the cap to a predetermined position to disengage the forearm, then fully removing the cap, allowing the forearm to be detached without complete cap removal and reducing the risk of losing the cap
Solution Approach 2:
The patent performs a preliminary rotation of the cap to a predetermined position that disengages the forearm from the magazine tube before complete removal, allowing the forearm to be detached in advance of full cap removal and preventing cap loss
Data Source
AI summary
A shotgun includes an action that is capable of rapidly chambering a shotshell after the shotgun has run out of shotshells and is capable of allowing shotshells to be removed from the magazine without cycling the shotshells through the action.