Bullpup Conversion Kit Trigger Bar Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bullpup conversion kits for firearms are prone to jamming, have aesthetic issues, and are complex to assemble, often deviating from manufacturer specifications and being incompatible with certain firearms due to exposed trigger linkage and interference with other components.
Innovation Solution
A bullpup conversion kit with a lower receiver that includes a trigger bar assembly entirely within the topside channel, a trigger shoe replacing the removable trigger, and three points of attachment between the upper and lower receivers, allowing for secure coupling and easy assembly/disassembly, maintaining ergonomic spacing without adding length or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional stocks are used to provide ergonomic spacing, then comfort and accuracy are improved, but firearm length and weight increase
Solution Approach 1:
The patent inverts the traditional layout by moving the magazine well forward of the trigger and relocating the trigger to the rear, creating a bullpup configuration. This inversion allows the firearm to maintain a long length of pull for ergonomics while having a compact overall length, as the stock can be shortened or eliminated.
Solution Approach 2:
The patent redistributes components along the longitudinal axis of the firearm, changing the spatial arrangement from traditional front-to-back sequencing to a reversed configuration. This dimensional reorganization allows ergonomic spacing to be achieved without proportionally increasing overall firearm length.
2Length of moving object
If bullpup conversion kits use exposed trigger linkage, then compactness is achieved, but aesthetics deteriorate and jamming occurs
Solution Approach 1:
The patent nests the trigger linkage components within the receiver housing, specifically using a trigger bar that is received within a channel in the receiver. This nesting conceals the linkage, improving aesthetics while protecting it from exposure-related jamming and slipping issues.
Solution Approach 2:
The patent introduces a trigger bar as an intermediary component that connects the forward trigger to the rear trigger mechanism. This trigger bar acts as a mediator that transfers force reliably while being protected within the receiver, eliminating the jamming issues associated with exposed cables or bars.
3Device complexity
If existing triggers are used in bullpup configuration, then simplicity is maintained, but manufacturer specifications for pull weight and length deviate
Solution Approach 1:
The patent segments the trigger system into distinct components: a forward trigger for user interaction, a trigger bar for force transmission, and a rear trigger mechanism for firing. This segmentation allows each component to be optimized for its specific function while maintaining overall compliance with manufacturer specifications.
Solution Approach 2:
The patent modifies the trigger system parameters by introducing a trigger bar with specific dimensional characteristics that ensure the length of pull and pull weight match the firearm manufacturer's specifications. The trigger bar's position and dimensions are carefully controlled to achieve precise trigger characteristics.
4Ease of manufacture
If traditional trigger linkage is used, then ease of manufacture is maintained, but assembly complexity increases
Solution Approach 1:
The patent designs the trigger bar assembly to serve multiple functions: it acts as a structural support element, a force transmission mechanism, and a positioning feature for the trigger. This multi-functionality reduces the number of separate components needed, simplifying both manufacturing and assembly.
Solution Approach 2:
The patent merges the trigger bar with the receiver structure by receiving the trigger bar within a channel formed in the receiver. This integration eliminates the need for separate mounting brackets or attachment mechanisms, simplifying the overall assembly process while maintaining structural integrity.
Data Source
AI summary
A bullpup conversion kit for a firearm including a lower receiver with a topside channel that partially receives an upper receiver of the firearm and a magazine well. The firearm includes a trigger pack with a removable trigger. A trigger bar assembly including a trigger bar, a front trigger mount, and a trigger shoe is received within the topside channel. The trigger bar extends along one side of the magazine well. The front trigger mount is disposed on a forward end of the trigger bar. The trigger shoe includes upper and lower ends. The upper end of the trigger shoe is pivotally coupled to the trigger pack in place of the removable trigger. The lower end of the trigger shoe is connected to a rearward end of the trigger bar by a pin. The lower receiver hinges away from the upper receiver about a front hook during disassembly.