Flexible Cable Guard for Archery Bows Reducing Cam Lean
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Solution Overview
Problem
Conventional archery bow cable guards are rigid and inflexible, leading to cam lean, limb twist, and excessive cable wear, which affects shot precision and accuracy, and are prone to wear and noise due to sliding components.
Innovation Solution
A cable guard that flexes to move relative to the bowstring plane, constructed from materials like glass fiber composites or metals, with a contoured shape and flexible central portion to minimize cam lean and limb twist, and includes low friction elements to reduce cable wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional rigid cable guards are used, then cable clearance is maintained, but cam lean and limb twist occur due to lateral forces when cables become taut
Solution Approach 1:
The cable guard transitions from a rigid structure to a flexible one that can dynamically adjust its position. The flexible cable guard bends when cables become taut during the draw cycle, absorbing lateral forces and preventing cam lean and limb twist while maintaining adequate cable clearance throughout the bow's operation.
Solution Approach 2:
The cable guard's flexibility parameter is changed by selecting appropriate materials and dimensions. The patent specifies that the cable guard should have sufficient flexibility to bend under cable tension but maintain structural integrity, achieving a balance between rigidity for clearance and flexibility for force absorption.
2Shape
If sliding cable guides are used, then cable positioning is achieved, but wear and noise increase due to sliding friction
Solution Approach 1:
The patent eliminates the sliding cable guide component entirely, extracting the source of friction and wear. Instead of using a separate guiding mechanism with moving parts, the flexible cable guard itself provides cable positioning through its bent shape, removing the sliding interface that caused wear and noise.
Solution Approach 2:
The cable guard combines multiple functions into a single component: it provides cable clearance, positions cables laterally, and absorbs lateral forces. This integration eliminates the need for separate sliding cable guides, reducing the number of moving parts and associated wear problems.
3Manufacturing precision
If flexible cable guards are used, then cam lean and limb twist are reduced, but the guard may excessively deflect or break at the cable engagement location
Solution Approach 1:
The cable guard is designed with non-uniform properties along its length. The portion near the cable engagement point has increased thickness or structural reinforcement to handle the concentrated loads, while other portions remain more flexible. This localized strengthening prevents excessive deflection or breaking at critical points while maintaining overall flexibility.
Solution Approach 2:
The cable guard's flexibility acts as a cushioning mechanism that absorbs the shock and lateral forces from cable tension before these forces can cause damage to cams or limbs. The flexible material and design allow controlled bending that dissipates energy, preventing the transmission of damaging forces to other components.
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 flexible cable guard reduces cam lean, limb twist, and cable wear, improving shot precision and accuracy while minimizing noise and assembly complexity.
Implementation Method 1
a cable guard and/or cable guide that can flex to selectively move a cable relative to a plane in which a bowstring of the bow travels
Implementation Method 2
includes low friction elements to reduce cable wear
Data Source
AI summary
An archery bow is provided including a cable guard and/or cable guide that can flex to selectively move a cable relative to a plane in which a bowstring of the bow travels to minimize cam lean, limb twist, and/or cable wear. The cable guard and/or guide can move toward the bowstring plane as the bowstring is drawn, and away from the bowstring plane, out of the way of the bowstring and any attached arrow, after the bowstring is released. The cable guard can define a bore, for example, an elongated bore, extending through it along an axis that is generally parallel to the bowstring when the bowstring is undrawn. The cable guard bore can operate as a cable guide, and can include a rounded opening to minimize abrasion to a cable moving through it. A ceramic element can be included in the bore to minimize abrasion to the cable.