Crossbow De-Cocker Sled With Stop for Safe Bowstring Let-Down
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Solution Overview
Problem
Existing crossbow systems face challenges in safely and efficiently transitioning the bowstring from a drawn to an undrawn position without causing damage or injury, often requiring complex mechanical components or leading to operator errors during de-cocking operations.
Innovation Solution
A crossbow de-cocking system incorporating a sled and a crossbow crank that allows for safe and controlled transition of the bowstring between drawn and undrawn modes, featuring a stop mechanism to prevent interference with safety mechanisms and a one-way bearing to control the de-cocking process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a winch is added to improve cocking efficiency, then cocking speed and ease of operation are improved, but device complexity and difficulty of operation increase due to additional controls and potential operator errors
Solution Approach 1:
The patent extracts the de-cocking function from the complex winch system by providing a separate, dedicated de-cocking mechanism. This allows the winch to be used solely for cocking operations while the de-cocking is handled by a simpler, dedicated system, thereby reducing the complexity burden during de-cocking operations.
Solution Approach 2:
The patent segments the cocking and de-cocking functions into separate mechanisms. The winch handles cocking operations while a dedicated de-cocking system handles the reverse operation. This segmentation allows each mechanism to be optimized for its specific function, reducing overall system complexity and operator error potential.
2Productivity
If the sled is used to de-cock the bowstring, then de-cocking efficiency is improved, but harmful factors increase due to potential engagement with safety mechanisms causing damage or injury
Solution Approach 1:
The patent applies preliminary anti-action by providing a stop mechanism that prevents the sled from moving far enough to engage the safety mechanism before the de-cocking operation begins. This preemptive measure ensures that even if the sled is used for de-cocking, it cannot accidentally engage and damage the safety mechanism or cause injury.
Solution Approach 2:
The stop mechanism acts as an intermediary between the sled and the safety mechanism. It allows the sled to move sufficiently to perform the de-cocking function while simultaneously blocking any further movement that would cause harmful engagement with the safety mechanism, thus mediating between productivity and safety requirements.
3Adaptability or versatility
If the stop mechanism is made modifiable to enable both de-cocking and drawing operations, then adaptability is improved, but device complexity increases due to additional modes and configurations
Solution Approach 1:
The patent applies dynamics by making the stop mechanism modifiable between different positions or configurations. The stop can be adjusted to either prevent sled movement during de-cocking operations or allow movement during drawing operations. This dynamic adaptability enables a single mechanism to serve multiple functions without requiring entirely separate systems for each operation.
Data Source
AI summary
A crossbow can include a de-cocking system to allow a bowstring to be transitioned from a drawn mode to an undrawn mode. The de-cocking system can include a sled that engages the bowstring to draw it to a drawn mode and/or lets down the bowstring to the undrawn mode during a de-cocking operation. The sled can include a stop that prevents the sled or bowstring from engaging a safety and/or interfering with transition of the safety from a safety on mode to a safety off mode. The safety can be manually actuated from the safety on mode to the safety off mode. With the safety in the off mode, upon actuation of a trigger assembly, the sled assists transition of the bowstring to the undrawn mode. The stop can be reconfigured to a neutral mode so the sled can be used to draw the bowstring. A related method is provided.