Compound Bow Cam Layout for Balanced Cable Routing
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Solution Overview
Problem
Conventional cable guards in compound bows introduce lateral torque, reducing arrow accuracy and causing limb twisting, and lead to power cables becoming dislodged from cams and wheels.
Innovation Solution
A compound bow design with cam devices that laterally offset power cables to maintain balanced torsional force distribution, eliminating the need for a cable guard by positioning the bowstring and support cable on opposite sides of the vertical central axis, using offset sheaves to balance twisting forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cable guard is mounted on the bow to displace power cables laterally, then the power cables are positioned out of the arrow's path, but lateral torque is introduced reducing arrow accuracy and causing limb twisting
Solution Approach 1:
The patent moves the power cable displacement from a lateral dimension (using cable guards that push cables sideways) to a vertical dimension by routing power cables through cam devices positioned above and below the bowstring. This vertical routing eliminates lateral torque while maintaining cable separation from the arrow path.
Solution Approach 2:
The cam devices serve as intermediary elements that vertically separate the power cables from the bowstring and arrow path. Instead of directly displacing cables laterally with a cable guard, the cam devices mediate the cable routing in a way that eliminates harmful lateral forces.
2Object-affected harmful factors
If a cable guard is used to displace power cables laterally, then cable interference with arrow is reduced, but power cables become dislodged from cams and wheels
Solution Approach 1:
The patent transitions from lateral cable displacement (which causes cables to feed on and off cams at angles leading to dislodgment) to vertical cable routing through cam devices. This vertical arrangement maintains proper cable engagement with cams and wheels while eliminating interference with the arrow.
3Stability of the object's composition
If power cables are routed through cam devices on opposite sides of the vertical axis, then balanced torsional force distribution is achieved, but device complexity increases
Solution Approach 1:
The patent employs asymmetric placement of cam devices on opposite sides of the vertical axis, with each cam device positioned at different vertical locations (one above, one below the bowstring). This asymmetric vertical arrangement creates balanced torsional forces while managing the complexity through a systematic routing pattern.
Data Source
AI summary
A set of archery cam devices for an archery bow is disclosed herein, including first and second cam devices configured to be rotatably coupled to first and second limbs of an archery bow, and having first and second bowstring sheaves, first and second control sheaves, and first and second power cable sheaves. When the archery bow is vertically oriented: a vertical riser plane extends through the riser ends; a vertical bowstring plane extends through the first and second bowstring sheaves; a vertical control plane extends through the first and second control sheaves; first and second vertical power cable planes extend through the first and second power cable sheaves; the vertical bowstring plane and the vertical control plane are located on opposite sides of the vertical riser plane; and the first and second vertical power cable planes are located on opposite sides of the vertical riser plane.