Compound Bow Cable Arrangement Preventing Pulley Slippage
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Solution Overview
Problem
Compound archery bows face issues with slippage of the secondary cable, leading to desynchronization of pulley members, non-linear movement of the draw cable, and inaccurate arrow flight due to the complex management of multiple cable segments.
Innovation Solution
A compound archery bow design featuring first and second pulley members that utilize a single continuous secondary cable, where both pulley members take up and let out different segments of the cable to prevent slippage, with the second pulley member engaging the intermediate segment to maintain synchronization, allowing for binary or hybrid cam configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cable segments are used in compound archery bows, then the pulley members can be designed with different functions (take-up and let-out), but slippage of the secondary cable occurs leading to desynchronization
Solution Approach 1:
The patent merges multiple cable segments into a single continuous secondary cable that passes through both pulley members. This single cable design eliminates slippage between separate cable segments while maintaining the differentiated take-up and let-out functions of the pulley members, thus resolving the contradiction between adaptability and reliability.
2Reliability
If a single continuous secondary cable is used, then slippage is prevented and synchronization is maintained, but cable management becomes complex
Solution Approach 1:
The single continuous secondary cable is segmented into functional portions: a first segment engaged with the take-up pulley member and a second segment engaged with the let-out pulley member. This segmentation simplifies cable management by clearly defining the function and engagement point of each cable portion, reducing the complexity of managing the continuous cable while maintaining synchronization.
3Reliability
If the second pulley member engages the intermediate segment of the secondary cable, then slippage is substantially prevented, but the cable arrangement becomes more complex
Solution Approach 1:
The intermediate segment of the secondary cable acts as an intermediary element that is engaged by the second pulley member. This intermediate segment serves as a dedicated engagement point that prevents slippage between the pulley member and the continuous cable, providing a reliable mechanical interface without requiring complex additional components or arrangements.
Data Source
AI summary
As a compound archery bow (binary cam or hybrid cam; having first and second pulley members, a draw cable, and a single, continuous secondary cable) is drawn and its pulley members rotate: (i) both pulley members let out the draw cable; (ii) a take-up pulley of the first pulley member takes up a first end segment of the secondary cable; (iii) a let-out pulley of the second pulley member lets out a portion of an intermediate segment of the secondary cable; and (iv) a take-up pulley of the second pulley member takes up a portion of the intermediate segment of the secondary cable. Engagement of the intermediate segment with the second pulley member substantially prevents slippage of the secondary cable.