Adjustable Pulley Assembly for Compound Archery Bow
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Solution Overview
Problem
Existing pulley assemblies for compound archery bows lack the ability to adjust the effective length of the power cable without derigging the bow or using a bow press, leading to inefficient synchronization of pulley assemblies and coarse adjustments.
Innovation Solution
An adjustable pulley assembly with a cable deflector that can be rigidly attached to the draw cable pulley in multiple deflector arrangements, allowing for fine adjustments of the power cable's effective length and synchronization with the second pulley assembly without derigging the bow or using a bow press, by altering the lateral deflection of the power cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the effective length of the power cable is adjusted by derigging the bow or using a bow press, then the synchronization of pulley assemblies can be modified, but the process becomes time-consuming and requires additional equipment
Solution Approach 1:
The cable deflector is designed with multiple adjustable positions that allow dynamic modification of the power cable path during operation. The adjustable mechanism enables users to change the effective length of the power cable by repositioning the deflector along the draw cable pulley, providing real-time synchronization adjustments without derigging the bow or using a bow press
Solution Approach 2:
The system enables self-adjustment of power cable length through the adjustable cable deflector mechanism. The archer can directly modify the synchronization by repositioning the deflector on the draw cable pulley, eliminating the need for external equipment like a bow press or time-consuming derigging processes
2Adaptability or versatility
If the cable deflector is fixed in a single position, then the structure is simple, but the ability to adjust effective cable length for synchronization is limited
Solution Approach 1:
The cable deflector is divided into multiple discrete positioning points along the draw cable pulley circumference. Each position provides a specific deflection angle and effective cable length, allowing incremental adjustments. The segmented approach maintains structural simplicity while providing multiple adjustable configurations for different synchronization requirements
Solution Approach 2:
The adjustable cable deflector serves multiple functions: it guides the power cable, provides adjustable effective length modification, and enables synchronization adjustment. This multi-functional component replaces what would otherwise require separate adjustment mechanisms, maintaining simplicity while enhancing versatility
3Measurement precision
If coarse adjustments are used for power cable length, then the adjustment process is simple, but precise synchronization at brace and full draw is difficult to achieve
Solution Approach 1:
The adjustable cable deflector provides a continuous or near-continuous range of adjustment positions along the draw cable pulley, enabling fine-tuned modification of the power cable effective length. This dynamic adjustment capability allows precise synchronization at both brace and full draw positions while maintaining ease of operation through a simple repositioning mechanism
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
Enables precise adjustment of the power cable's effective length and synchronization of pulley assemblies at brace and full draw, reducing the need for derigging and bow press use, providing finer increments of length adjustment and maintaining constant deflection throughout drawing.
Implementation Method 1
the cable deflector is positioned and arranged so as to deflect laterally the adjacent segment of the power cable by a corresponding amount
Implementation Method 2
be mounted on a first limb of an archery bow to rotate about the first pulley assembly axis, and (iii) let out from a circumferential draw cable journal of the draw cable pulley a draw cable of the archery bow when the bow is drawn and the draw cable pulley rotates about the first pulley assembly axis
Implementation Method 3
a segment of the anchored power cable that is displaced from the power cable anchor is taken up by a circumferential power cable journal of the power cable pulley
Data Source
AI summary
A pulley assembly for a compound bow comprises a draw cable pulley, a power cable pulley attached to the draw cable pulley, and a cable deflector attached to the draw cable pulley and adjustable among multiple deflector arrangements. Deflection of the power cable by the cable deflector remains constant throughout drawing of the bow. Movement of the cable deflector alters deflection of the power cable to alter effective length of the power cable and relative synchronization (with the bow at brace) of the pulley assembly with a second pulley assembly. The adjustment can in some instances be performed without using a bow press and without derigging the bow.