Integrated Crossbow Cocking Assembly for Dry-Fire Prevention
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Solution Overview
Problem
Crossbows require significant user input force to draw the string and are prone to dry firing, which can cause damage.
Innovation Solution
A cocking assembly with a rail, drawstring carrier, and actuator that facilitates easier loading by converting linear motion into rotational motion, preventing inadvertent release of energy during loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional cranks or tethers are used to draw the crossbow, then the user input force is reduced, but the system becomes more complex and parts may be damaged or lost in the field
Solution Approach 1:
The patent integrates the cocking mechanism directly into the rail assembly, merging the drawing function with the existing structural component. The actuator moves along the rail to directly draw the drawstring, eliminating the need for separate cranks or tethers while reducing part count and complexity
Solution Approach 2:
The actuator is designed to move along the rail and automatically engage with the drawstring carrier, allowing the system to perform the cocking function through its own integrated components without requiring external auxiliary parts that could be damaged or lost
2Productivity
If the drawstring is drawn rearward, then the crossbow is loaded, but the likelihood of dry firing increases due to finger slippage on loading systems
Solution Approach 1:
The drawstring carrier serves as an intermediary component between the actuator and the drawstring. It provides a secure engagement point that prevents direct finger contact with the drawstring during cocking, eliminating the risk of finger slippage and subsequent dry firing while maintaining efficient loading
Solution Approach 2:
The actuator moves along the rail to position and secure the drawstring carrier in the rearward position before the drawstring is fully engaged and ready to fire. This preliminary positioning ensures the crossbow is properly loaded and prevents inadvertent release
3Power
If a spooling assembly is used to convert linear motion to rotational motion, then the actuator can be smaller, but the device complexity increases
Solution Approach 1:
The rail serves multiple functions: it guides the actuator's linear motion, provides structural support, and works in conjunction with the spooling assembly to convert motion. This multi-functionality allows the use of a smaller actuator without significantly increasing overall device complexity, as the existing rail structure is utilized for additional purposes
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
Reduces the likelihood of dry firing and makes crossbow loading more efficient and user-friendly by minimizing the required input force.
Implementation Method 1
The actuator is operatively coupled to the rail and configured to move along the rail between the front end and the rear end. The spool is operatively coupled to the actuator and configured to rotate with a movement of the actuator along the rail.
Data Source
AI summary
A cocking assembly includes a frame, a drawstring carrier, and an actuator. The drawstring carrier is configured to retain a drawstring and move in a rearward direction to draw the drawstring. The actuator is operatively coupled to the drawstring carrier and movably engaged with the frame, the actuator configured to move along the frame to move the drawstring carrier in the rearward direction.