Offset Synchronizer Compound Bow Torque Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Advanced compound bow designs are more complex and prone to coming out of adjustment, necessitating a novel bow design that enhances performance and stability.
Innovation Solution
The design features a frame supporting first and second limbs with rotatable members, a bowstring, and power cables that utilize offset centerpoints and circular tracks to synchronize rotation and torque application, ensuring consistent performance and reduced adjustment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If advanced compound bow designs are used to enhance performance, then shooting performance is improved, but device complexity increases and the bow becomes more prone to coming out of adjustment
Solution Approach 1:
The patent applies asymmetry by offsetting the centerpoint of the synchronizer track from the rotation axis of the second rotatable member. This asymmetric configuration creates an unequal moment arm between the power cable and synchronizer, which generates a counterbalancing torque that compensates for the torque applied to the first rotatable member. This resolves the complexity issue by providing a passive torque balancing mechanism rather than requiring active adjustment systems.
2Productivity
If advanced compound bow designs are used to enhance performance, then shooting performance is improved, but the bow becomes more prone to coming out of adjustment
Solution Approach 1:
The offset synchronizer track design enables the bow to self-regulate torque balance automatically during the draw cycle. The unequal moment arms create inherent torque compensation that maintains synchronization between rotatable members without requiring external adjustment mechanisms. This self-balancing property improves reliability by eliminating the need for frequent user adjustments.
Solution Approach 2:
The patent changes the geometric parameter of the synchronizer track by offsetting its centerpoint from the rotation axis. This parameter modification alters the moment arm length and consequently the torque characteristics of the power cable system. By adjusting this geometric parameter, the design achieves optimal torque balance that maintains adjustment stability throughout the bow's operational cycle.
3Stability of the object's composition
If offset centerpoints and circular tracks are used to synchronize rotation, then torque balance is maintained, but device complexity increases
Solution Approach 1:
The patent employs circular arcs for the bowstring track, power cable track, and synchronizer track instead of straight lines or simple rotational paths. These curved trajectories are centered at offset points that create the necessary moment arm variations for torque balancing. The circular geometry provides smooth, continuous motion while maintaining the asymmetric torque compensation needed for synchronization.
Data Source
AI summary
In some embodiments, an archery bow comprises a frame supporting a first limb and a second limb. A first rotatable member is supported by the first limb and arranged to rotate about a first rotation axis. The first rotatable member comprises a cam track. A second rotatable member is supported by the second limb and arranged to rotate about a second rotation axis. The second rotatable member comprises a synchronizer track. A bowstring extends between the first rotatable member and the second rotatable member. A power cable is arranged to be taken up on the cam track and fed out from the synchronizer track as the bow is drawn. The synchronizer track is circular and a centerpoint of the synchronizer is offset from the second rotation axis.