Crossbow Cocking Mechanism with Removable Motor and Clutch
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Solution Overview
Problem
Existing crossbows lack an integrated cocking mechanism and a reliable, efficient method for engaging and releasing the bow string, which can be time-consuming and labor-intensive.
Innovation Solution
A crossbow with a built-in cocking mechanism that includes a hand crank assembly and an optional removable motor gearbox assembly with a clutch and micro-switch control, allowing for automated string engagement and release, utilizing a screw-drive type system with ACME threads for precise string movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a manual cocking mechanism is used, then the device complexity is low, but the productivity and ease of operation are reduced due to time-consuming and labor-intensive cocking process
Solution Approach 1:
The cocking mechanism is divided into separate functional modules: a crank assembly for manual operation and an optional motor gearbox assembly for automated operation. This segmentation allows users to choose the appropriate cocking method while keeping the overall system manageable in complexity.
Solution Approach 2:
A clutch assembly acts as an intermediary between the motor gearbox and the drive shaft. The clutch engages and disengages the motor's rotational force from the drive shaft, allowing automated cocking without permanently coupling the motor to the mechanism, thus reducing overall system complexity when automated cocking is not needed.
2Ease of operation
If a motor gearbox assembly is added for automated cocking, then the ease of operation and productivity improve, but the device complexity and weight increase
Solution Approach 1:
The motor gearbox assembly is designed to be removable and interchangeable with the manual crank assembly. This dynamic configuration allows the system to adapt between automated and manual operation modes, providing ease of operation when needed while maintaining simplicity when the motor is removed.
Solution Approach 2:
The motor gearbox assembly can be completely removed from the crossbow, extracting the automated cocking capability when it is not needed. This allows users to possess the option for automated operation without being permanently burdened by the added complexity and weight.
3Reliability
If a clutch assembly is used to control motor rotation, then the reliability and precision of string engagement improve, but the device complexity increases
Solution Approach 1:
The clutch assembly is designed to automatically engage and disengage based on the mechanical interaction between the drive shaft and the latch assembly. The clutch self-regulates the motor's rotational force, preventing over-rotation and ensuring precise string engagement without requiring complex external control systems.
4Adaptability or versatility
If a removable motor gearbox assembly is provided, then the adaptability and ease of repair improve, but the device complexity increases
Solution Approach 1:
The motor gearbox assembly is designed with standardized mounting interfaces that allow it to be easily installed and removed. This dynamic reconfigurability provides adaptability for different user needs while the standardized interfaces keep the complexity of the removal and installation process minimal.
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 automated cocking and decocking of the crossbow, reducing manual effort and increasing operational speed, while providing a reliable and safe string engagement mechanism.
Implementation Method 1
utilizing a screw-drive type system with ACME threads for precise string movement
Data Source
AI summary
A crossbow having a built in manual cocking mechanism that may also be utilized with an optional built in, removable motor gearbox assembly and power source. The motor gearbox assembly may or may not have a clutch assembly, whereby rotational force reaches a predetermined amount, rotation of the drive shaft ceases. Switches may be provided to start, stop, and reverse the direction of rotation of the motor gearbox assembly, as well as switches and or circuits that may control operation of the motor gear set.