Crossbow Trigger Mechanism for Safe Uncocking
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Solution Overview
Problem
Crossbows with increased firing velocity pose a risk of damage and safety concerns when dry-fired to release the bowstring from a cocked to an un-cocked position without firing a bolt or arrow, as this can damage components and pose a safety hazard.
Innovation Solution
A trigger mechanism with a housing, trigger lever, catch, disarm mechanism, and safety switch that allows the bowstring to be released from a cocked to an un-cocked position without dry firing, using a bowstring cocking device to move the disarm mechanism and trigger lever out of engagement with the catch, enabling safe uncocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the crossbow is dry-fired to release the bowstring from cocked to un-cocked position, then the bowstring can be released without firing a bolt or arrow, but the bowstring, limbs, cams and other components may be damaged and safety concerns arise
Solution Approach 1:
A disarm mechanism acts as an intermediary device between the trigger and the catch. When activated, it moves to disengage the trigger lever from the catch, allowing the bowstring to be released without direct trigger engagement. This intermediary mechanism prevents the harmful dry-fire impact while enabling safe uncocking through controlled disengagement of the firing mechanism.
2Ease of operation
If the trigger mechanism is simplified to allow easy uncocking, then ease of operation improves, but the ability to prevent dry-fire damage may be compromised
Solution Approach 1:
The trigger mechanism is segmented into distinct functional components: a trigger lever for normal firing, a separate disarm mechanism for safe uncocking, and a catch for retaining the bowstring. This segmentation allows the disarm mechanism to handle the uncocking function independently, preventing the trigger lever from engaging the catch during dry-fire scenarios while maintaining simple operation through dedicated controls.
3Reliability
If a disarm mechanism is added to prevent dry-fire damage, then component integrity is protected, but the device complexity increases
Solution Approach 1:
The disarm mechanism is integrated into the existing trigger mechanism housing and shares common components such as the trigger lever and catch. The disarm mechanism utilizes the same structural framework and mounting points, merging its functionality with the existing design rather than adding entirely separate components. This reduces overall complexity compared to a completely independent dry-fire prevention system.
Data Source
AI summary
A trigger mechanism for use in a crossbow comprises a housing having a first slot formed in a first side and a second slot formed in a second side opposite the first side. A trigger lever, a bowstring catch and a disarm mechanism are all moveably mounted in the housing. The catch has a first end configured to engage the trigger lever and a second end configured to retain the bowstring in a cocked position. The disarm mechanism is partially positioned in the second slot and is moveable between a fixed first position proximate the housing second slot toward a second disarm position toward the housing first slot. As the disarm mechanism moves from the first position into the second position, it engages the trigger lever causing it to move out of engagement with the catch first end allowing the user to release the bowstring using the bowstring cocking device from the trigger mechanism without having to engage the trigger.