Crossbow Anti Dry-Fire Catch Mechanism
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Solution Overview
Problem
Existing crossbows lack a retrofitable anti dry-fire device to prevent the bow from cracking or breaking due to rapid unbinding when a string is released without an arrow, which can lead to accidental dry-firing.
Innovation Solution
An anti dry-fire device mounted on a viewfinder mount with a catch rotationally attached to a catch holder, featuring a catch biasing mechanism, a lock-unlock mechanism, and a biased ball bearing that blocks the string release in one direction while allowing it in the other, enabling safe arrow loading and firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a string catch member is integrated into the trigger mechanism, then dry-fire prevention is achieved, but the device complexity increases and retrofitting becomes difficult
Solution Approach 1:
The anti-dry-fire function is segmented from the trigger mechanism and implemented as a separate catch member that can be independently installed on the viewfinder mount. This modular approach prevents dry-fire while avoiding the need to redesign the entire trigger system, thus reducing overall device complexity.
Solution Approach 2:
A separate catch member acts as an intermediary component between the string and the trigger mechanism. This catch member selectively blocks or permits string release based on arrow presence, providing dry-fire prevention without directly modifying the trigger mechanism's internal complexity.
2Reliability
If an anti dry-fire system is built into existing crossbows, then dry-fire protection is provided, but the ease of manufacture and retrofitting capability are reduced
Solution Approach 1:
The catch member is designed with universal compatibility to fit multiple crossbow models by mounting on the standard viewfinder mount. This universal design enables easy retrofitting across different crossbow platforms while maintaining effective dry-fire protection, thereby improving ease of manufacture and deployment.
Solution Approach 2:
The catch member is pre-configured with the correct geometry and mounting features to interface with existing crossbow components. This preliminary design consideration allows for straightforward installation without requiring complex manufacturing processes or extensive modifications to existing crossbows.
3Reliability
If a catch member blocks string release, then dry-fire is prevented, but the ease of operation is reduced due to additional manual steps
Solution Approach 1:
The catch member is designed to be dynamically movable between a blocking position (when no arrow is present) and a cleared position (when an arrow is loaded). This dynamic behavior automatically adapts to the loading state, preventing dry-fire during unloading while allowing normal operation when properly loaded, thus minimizing impact on ease of operation.
Solution Approach 2:
The catch member automatically detects the presence or absence of an arrow through its interaction with the string and trigger mechanism, and self-adjusts its position accordingly. This self-service capability eliminates the need for manual intervention to enable/disable the safety feature, maintaining ease of operation while ensuring reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively prevents dry-firing by blocking the string release when no arrow is present, acting as a safety mechanism to prevent accidental triggering and bow damage, and can be easily retrofitted onto existing crossbows.
Implementation Method 1
A biased ball bearing is selectively biased from a first cavity to a second cavity when the lock-unlock means is moved from unlock mode to lock mode
Implementation Method 2
A catch biasing means to bias the catch
Data Source
AI summary
An anti dry-fire device for crossbows mounted on a viewfinder mount has a catch rotationally attached to a catch holder by way of an attachment pin. A catch biasing means to bias the catch. A lock-unlock means slidingly engaged on the top of the viewfinder mount. The lock-unlock means moving the catch from an operative mode into an inoperative mode.