Archery Bow Dual Limb Cam Lean Adjustment
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Solution Overview
Problem
Compound bows suffer from cam lean due to side loads, limb inconsistency, and varying loads on cams, leading to string derailment, premature string failure, and cable wear, which existing technologies fail to adequately address.
Innovation Solution
The implementation of dual limbs with independent adjustments allows for control of cam lean, minimizing string and cable wear, and enables adjustable limb angles to modify bow geometry, ensuring a straight path for the string and reducing the initial reaction force during arrow release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual limbs with independent adjustments are implemented, then cam lean control is improved and string/cable wear is reduced, but device complexity increases
Solution Approach 1:
The bow system divides the limb structure into separate left and right limbs that can be independently adjusted. Each limb has its own containment device and adjustment mechanism, allowing independent control of cam lean for each side. This segmentation enables precise correction of cam lean issues without requiring complex integrated systems.
Solution Approach 2:
The limb containment devices incorporate adjustable elements that allow dynamic modification of limb position and angle. The ability to independently adjust each limb's containment device enables the system to adapt cam lean in real-time, providing dynamic control over string and cable alignment to reduce wear.
2Productivity
If limb angle is made variable to modify bow geometry, then arrow launch performance is improved, but device complexity increases
Solution Approach 1:
The limb mounting system incorporates variable angle containment devices that allow the limb angle to be adjusted. This dynamic capability enables modification of bow geometry to optimize arrow launch performance while maintaining a relatively simple mounting structure through standardized adjustment mechanisms.
Solution Approach 2:
The system allows change of geometric parameters including limb angle and axle-to-axle length through adjustable containment devices. By modifying these parameters, the bow geometry can be optimized for different shooting conditions and archer preferences, improving overall performance.
3Reliability
If independent dual limb adjustments are used to control cam lean, then string derailment is prevented, but ease of operation decreases
Solution Approach 1:
The independent adjustment mechanism for each limb allows archers to address cam lean issues on one side without affecting the other. This segmented approach simplifies the adjustment process by allowing focused correction of specific problems rather than requiring simultaneous adjustment of the entire system.
Solution Approach 2:
The adjustment mechanisms are designed to be user-operable without requiring professional help or special equipment. Archers can independently adjust their own bows to correct cam lean and optimize performance, making the system self-service capable.
4Length of moving object
If cams are positioned closer to the riser to enable shorter limbs, then bow compactness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The adjustable containment devices compensate for variations in cam positioning relative to the riser. By allowing dynamic adjustment of limb angle and position, the system can accommodate tighter tolerances in manufacturing while maintaining proper cam lean and string alignment.
Data Source
AI summary
An archery bow system incorporating a bow riser and dual limbs supporting cams or a cam and wheel mounted for rotation about respective axles. The dual limbs are independently adjustable to correct for cam lean and are individually supported in pockets that incorporate variable limb angle attachments to the bow riser. The limbs extend from the riser to flex, when at full draw, to positions that cause the respective axles to initially travel rearward toward the archer upon release of the bowstring. The limbs are adjustably attached to the riser to permit the limb angle with respect to the riser to be changed.