Crossbow De-Cocking Sled with Safety Stop and One-Way Bearing
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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 damaging the crossbow components or risking user injury, often requiring complex mechanical components or sequences that can lead to operator error.
Innovation Solution
A crossbow de-cocking system with a sled and 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 the safety and a one-way bearing to control the crank operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a winch is used to draw the crossbow to improve speed and power, then the crossbow can achieve higher draw weights, but the operation becomes complicated and prone to operator error
Solution Approach 1:
The de-cocking operation is divided into distinct phases: a first phase where the sled is moved to a first position to engage the bowstring, and a second phase where the sled is moved to a second position to disengage from the bowstring. This segmentation allows the complex winch operation to be broken down into manageable steps, reducing operator error while maintaining the high power capability.
Solution Approach 2:
The sled is designed with dynamic positioning capability, allowing it to move between a first position for engagement and a second position for disengagement. This dynamic design enables the system to adapt its configuration based on the operational phase, simplifying the user interface while preserving the winch's high power output capability.
2Ease of operation
If the sled is moved to engage the bowstring during de-cocking, then the bowstring can be transitioned to undrawn mode, but the sled may interfere with the safety mechanism
Solution Approach 1:
The sled's movement is constrained to a linear path along the rail, and the safety mechanism operates in a perpendicular dimension. By designing the sled's trajectory to be orthogonal to the safety's plane of operation, the system eliminates interference between the two components while maintaining full de-cocking functionality.
Solution Approach 2:
The rail acts as an intermediary guide that separates the sled's movement path from the safety mechanism's operational space. This intermediate structure allows the sled to engage and disengage the bowstring without direct contact or interference with the safety, enabling safe de-cocking operation.
3Productivity
If the trigger mechanism is used to release the bowstring, then the crossbow can fire, but the stored energy can damage components and injure the user during de-cocking
Solution Approach 1:
The de-cocking function is extracted from the trigger mechanism and assigned to a dedicated sled system. This separation allows the trigger to remain dedicated to firing operations while the sled handles the safe de-cocking process, preventing the release of stored energy through the trigger and eliminating the risk of damage and injury.
Solution Approach 2:
The sled is positioned in advance to engage the bowstring before any firing or de-cocking action is taken. This preliminary positioning ensures that the bowstring is securely held and controlled by the sled system, preventing uncontrolled energy release and protecting both components and users from damage.
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
Enables efficient and safe cocking and de-cocking of crossbows, reducing the risk of operator error and damage, while allowing for easy conversion between modes with a simplified mechanism.
Implementation Method 1
a one-way bearing to control the crank operation
Implementation Method 2
a stop mechanism to prevent interference with the safety
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. A frame and/or 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, 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.