Crossbow Trigger Mechanism for Safe De-cocking
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Solution Overview
Problem
Crossbows with increased firing velocity pose a risk of damage and safety concerns when dry-fired, as it can lead to unintended impacts on the bowstring and other components.
Innovation Solution
A trigger mechanism with a housing, pivotally mounted trigger lever, catch, and disarm mechanism that allows controlled release of the bowstring without requiring user engagement, enabling safe de-cocking without dry firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If crossbow is designed for increased firing velocity, then firing performance is improved, but risk of damage and safety hazards during dry firing increases
Solution Approach 1:
The crossbow is designed with a preliminary action mechanism that automatically performs a controlled dry fire sequence before actual firing. The bowstring is released in a controlled manner without firing a bolt, which serves to safely release tension and prevent damage accumulation. This preliminary safety action is built into the trigger mechanism itself, allowing the user to safely prepare the crossbow without risking component damage from improper dry firing.
Solution Approach 2:
A specialized trigger mechanism acts as an intermediary between the user's intent to fire and the actual bowstring release. This intermediary mechanism provides a distinct safe mode that releases the bowstring without the full firing sequence, mediating between the high-energy state of a cocked crossbow and complete safety. The mechanism translates user input into either a safe controlled release or a full firing event, preventing harmful unauthorized dry fires.
2Device complexity
If traditional trigger mechanism is used, then device simplicity is maintained, but ability to safely de-cock without dry firing is lost
Solution Approach 1:
The trigger mechanism incorporates dynamic functionality that adapts its behavior based on user input. The trigger can operate in multiple modes: a traditional firing mode and a safe de-cocking mode. The mechanism dynamically transitions between these states through user interaction, allowing the same physical trigger to perform different functions. This dynamic capability enables safe de-cocking without requiring a completely separate mechanism, maintaining relative simplicity while adding safety functionality.
Solution Approach 2:
The trigger mechanism is designed with multi-functionality, serving both as a traditional firing trigger and as a safe de-cocking mechanism. The same trigger assembly performs multiple functions: it can initiate a full firing sequence when pulled in normal operation, and it can initiate a controlled safe release sequence when activated in de-cocking mode. This universal design eliminates the need for separate mechanisms for different operations, maintaining device simplicity while enhancing safety capabilities.
Data Source
AI summary
A trigger mechanism for use in a crossbow having a bowstring, the trigger mechanism comprising a housing having a slot formed therein, a trigger lever pivotally mounted in the housing and having a trigger that extends partially outside the housing, a catch pivotally mounted in the housing, and a disarm mechanism received in the housing that is moveable between a neutral first position and a disarm second position. The catch has a first end configured to retain the bowstring in a cocked position and a second end configured to operatively engage the trigger lever. When the disarm mechanism is in the disarm second position and the user draws the bowstring further into the housing slot, the trigger mechanism is configured to allow the catch to move from the catch first position into the catch second position without requiring the user to engage the trigger (e.g., squeezing or pulling the trigger).