Crossbow Conversion Kit Trigger Assembly and Draw-Lock Bar
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Solution Overview
Problem
Crossbow hunters face challenges with high draw weights requiring two-handed cocking and de-cocking, limited to single shots due to cumbersome re-cocking, and difficulty in holding the bow steady for extended periods, while compound bows offer better accuracy but require consistent anchoring and mechanical releases.
Innovation Solution
The development of a conversion kit and hybrid compound bow with an improved butt stock and trigger/string release assemblies, allowing for conversion between left and right-handed configurations, a draw-lock bar with a pistol grip, and a pivoting butt stock for compact storage, along with a sliding cover for the string latch to prevent accidental release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crossbow uses high draw weight (150-225 lbs) to achieve deep penetration energy, then penetration capability is improved, but cocking and de-cocking becomes difficult requiring two-handed operation
Solution Approach 1:
The crossbow system is divided into separate functional components: a stirrup mechanism for string engagement, a trigger assembly for controlled release, and a stock for support. This segmentation allows the cocking operation to be performed separately from the shooting operation, enabling easier one-handed triggering while maintaining high draw weight for penetration.
Solution Approach 2:
A stirrup acts as an intermediary mechanism between the user's foot and the bow string, providing mechanical advantage for cocking. The trigger assembly serves as an intermediary for de-cocking, allowing controlled release without direct manual manipulation of the high-tension string. These intermediary devices mediate the interaction between the user and the high draw weight system.
2Productivity
If crossbow is held on approaching target for extended time to wait for shot opportunity, then shooting capability is improved, but holding stability deteriorates due to draw weight acting against archer's muscles
Solution Approach 1:
The stock design incorporates a butt plate and positioning features that distribute the draw weight counterforce across the shooter's shoulder and body rather than concentrating it on arm muscles. This counterbalancing arrangement allows the archer to hold the loaded crossbow steadily for extended periods without muscle fatigue, maintaining both stability and shooting capability.
3Measurement precision
If compound bow uses string loop and mechanical release for consistent anchoring, then accuracy is improved, but operation complexity increases compared to crossbow
Solution Approach 1:
The trigger assembly is designed to perform multiple functions: it acts as the firing mechanism, incorporates the string release, and provides anchoring reference points. This multi-functionality consolidates several operations into a single integrated system, achieving consistent anchoring and accuracy similar to compound bows while reducing overall operational complexity compared to separate string loops and mechanical releases.
4Ease of operation
If crossbow latch is used for string release, then ease of operation is improved, but consistent anchoring point deteriorates compared to compound bow
Solution Approach 1:
The traditional crossbow latch mechanism is replaced with a trigger assembly that uses spring-loaded mechanical engagement and release. This substitution maintains the ease of pistol-grip trigger operation while incorporating features like a defined anchor point and consistent release mechanics, thereby improving anchoring point consistency without sacrificing operational simplicity.
Data Source
AI summary
A kit for converting a compound bow into an inline crossbow includes a draw-lock bar with a mechanism to attach the bow to one end. Near the other end of the draw-lock bar is a trigger assembly that attaches to one side of the bar and a string latch and release assembly that attaches to an opposite side of the bar. The trigger assembly and the latch/release assembly—can be attached on either side of the bar such that the bow is configured for left or right hand shooting. The trigger assembly is attached to the bar well forward of the latch/release assembly, and an actuator rod that passes inside of the draw-lock bar connects the trigger with the string latch/release. A sliding cover over the string latch prevents the released bow string from stinging the archer's cheek.