Crossbow String-Loading Apparatus with Rotating Locking Rod
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Solution Overview
Problem
Conventional crossbow string-loading apparatuses lack a mechanism to securely maintain the handle connected to the reels during the loading process, leading to accidental detachment and potential user injury.
Innovation Solution
A string-loading apparatus comprising a reel, a crank, a locking rod, a pin, and a handle, where the locking rod is rotatable between a locking and unlocking position, ensuring the handle remains securely attached to the reel, preventing accidental detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the handle is connected to the reels without a locking mechanism, then the device complexity is reduced, but the reliability deteriorates due to accidental detachment
Solution Approach 1:
The locking rod is designed to be rotatable between a locking position and an unlocking position, allowing the connection state to be dynamically changed by the user. This dynamic mechanism ensures reliable connection during string loading while maintaining ease of assembly and disassembly when not in use.
Solution Approach 2:
The locking rod acts as an intermediary component between the handle and the reel. It mediates the connection by engaging with the fin on the reel when in the locking position, providing a reliable link without requiring a permanent or complex fixed connection structure.
2Reliability
If a locking mechanism is added to secure the handle to the reel, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The locking rod is designed to be rotatable between a locking position and an unlocking position, allowing the connection state to be dynamically changed by the user. This dynamic mechanism ensures reliable connection during string loading while maintaining ease of assembly and disassembly when not in use.
Solution Approach 2:
The locking rod acts as an intermediary component between the handle and the reel. It mediates the connection by engaging with the fin on the reel when in the locking position, providing a reliable link without requiring a permanent or complex fixed connection structure.
3Object-affected harmful factors
If the handle is securely locked to the reel, then the safety is improved by preventing accidental detachment, but the ease of operation deteriorates due to additional locking steps
Solution Approach 1:
The locking rod is designed to be rotatable between a locking position and an unlocking position, allowing the connection state to be dynamically changed by the user. This dynamic mechanism ensures reliable connection during string loading while maintaining ease of assembly and disassembly when not in use.
Solution Approach 2:
The locking mechanism is designed to be self-operating through the rotation of the locking rod. The user simply needs to rotate the locking rod to engage or disengage the fin, and the mechanism itself maintains the locked state without requiring additional fastening steps or complex operations.
Data Source
AI summary
A string-loading apparatus for a crossbow includes a reel, a crank, a locking rod, a pin and a handle. The reel includes a centric bore, an eccentric bore, and a fin extending around the centric bore. The crank includes an axial aperture and a cavity. The locking rod includes a radial protuberance. The locking rod is rotationally inserted in the axial aperture of the handle. The locking rod is insertable in the centric bore of the reel. The pin is insertable in the cavity of the crank and the eccentric bore of the reel. The handle is connected to the third section of the locking rod to allow operation of the handle to rotate the locking rod between a locking position where the protuberance is overlapped with the fin and an unlocking position where the protuberance is biased from the fin.