Vectoring Anchor System for Archery Bow Cam Synchronization
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Solution Overview
Problem
Compound archery bows, particularly those with two cam designs, face issues with synchronization leading to reduced arrow launch speed, increased vibration, and maintenance requirements, while single cam bows lack speed and require more maintenance.
Innovation Solution
The design incorporates a vectoring anchor system where power cables are anchored to rotatable members with offset axes, allowing for self-alignment and reduced friction, thereby maintaining synchronization and enhancing mechanical efficiency and arrow launch speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If two cam designs are used to increase arrow launch speed, then arrow launch speed is improved, but synchronization maintenance and vibration increase
Solution Approach 1:
The patent divides the cam system into two independent cam members (first cam member and second cam member) that operate separately without direct mechanical linkage. Each cam can rotate independently on its own axis, eliminating the synchronization problems of traditional two-cam systems while maintaining the speed benefits.
Solution Approach 2:
The patent introduces power cables as intermediaries that connect the draw string to the cam members indirectly. The power cables transfer force from the draw string to each cam member independently, allowing both cams to function simultaneously without requiring direct mechanical synchronization between them.
2Stability of the object's composition
If direct mechanical linkage is used to synchronize cams, then synchronization is improved, but friction and energy loss increase
Solution Approach 1:
The patent uses power cables as intermediary elements to transmit force from the draw string to the cam members. This indirect linkage eliminates direct mechanical contact between cam components, significantly reducing friction and energy loss while still achieving functional synchronization through the shared power cable system.
Solution Approach 2:
The patent replaces direct mechanical linkage between cam members with a cable-based force transmission system. This substitution reduces mechanical friction and wear while maintaining the necessary coordination between cams through the elastic properties and tension of the power cables.
3Ease of repair
If single cam design is used to reduce maintenance, then maintenance requirements are reduced, but arrow launch speed decreases
Solution Approach 1:
The patent segments the cam system into two independent cam members that function separately. Each cam member can be maintained or replaced independently, simplifying maintenance compared to a single complex cam system, while the combined action of both cams provides superior arrow launch speed compared to a single cam design.
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
The vectoring anchor system improves arrow launch speed, reduces vibration, and decreases maintenance needs by allowing the rotatable members to align without direct mechanical linkage, enhancing the overall performance and usability of the archery bow.
Implementation Method 1
A first rotatable member is rotatable about a first rotatable member axis. A first power cable anchor is attached to the first rotatable member and rotatable with respect to the first rotatable member about a first anchor axis. The first anchor axis is offset from the first rotatable member axis.
Data Source
AI summary
In some embodiments, an archery bow comprises a rotatable member configured for rotation about a first rotatable member axis. A cable anchor is attached to the rotatable member and rotatable with respect to the rotatable member about an anchor axis. The anchor axis is offset from the rotatable member axis. The bow can further comprise a power cable anchored to said cable anchor.