Pivotable Limb Mounting System for Archery Bow Stress Reduction
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Solution Overview
Problem
Existing bow limb mounting systems for compound bows impart excessive stress to the pivot point and prevent the forward most butt of the bow limb from flexing naturally, leading to premature failure and reduced draw weight.
Innovation Solution
A limb mounting system featuring a pivotable bow limb fulcrum at the rearward edge of the handle riser and a positive positioning system with a complementary limb bolt head, swivel washer, and limb cap that allows the bow limb to swivel and flex during drawing, reducing stress and enabling natural outward flexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the limb bolt rigidly secures the butt of the bow limb to the riser, then the connection strength is improved, but the stress on the forward most butt of the bow limb increases due to inability to flex naturally
Solution Approach 1:
The invention replaces the rigid fixed connection with a dynamic pivotable connection. The limb bolt is configured to pivot within the limb pocket, allowing the butt of the bow limb to rotate and flex naturally during drawing. This dynamic adjustment enables the connection to adapt to changing stress patterns while maintaining strength.
Solution Approach 2:
The invention changes the mechanical parameter of the connection from fixed rigidity to controlled mobility. By allowing the limb bolt to pivot within a specific range in the limb pocket, the system transitions from a rigid connection to a semi-flexible one that can accommodate natural limb flexing while maintaining secure attachment.
2Stability of the object's composition
If the bow limb pivots against the rearward edge of the limb pocket during drawing, then the pivot point is defined, but great stress is imparted to the bow limb at the pivot point causing premature failure
Solution Approach 1:
The invention introduces the limb pocket as an intermediary structure between the rigid riser and the bow limb. The limb pocket acts as a mediator that allows controlled pivoting motion, distributing stress away from a single fixed pivot point and preventing premature failure while maintaining stable pivot definition.
Solution Approach 2:
The limb bolt is designed to pivot dynamically within the limb pocket rather than being fixed. This dynamic pivoting action allows the connection to adapt to the natural motion of the bow limb during drawing, reducing stress concentration and improving reliability.
3Stability of the object's composition
If the limb bolt is positioned to secure the butt of the bow limb, then the mounting is stable, but the forward most butt cannot follow the natural outward flexing of the middle portion
Solution Approach 1:
The limb bolt is configured with pivoting capability within the limb pocket, transforming the mounting from a static fixed position to a dynamic adjustable position. This allows the butt of the bow limb to naturally follow the outward flexing of the middle portion while maintaining stable mounting throughout the motion range.
Solution Approach 2:
The invention changes the positional parameter of the limb bolt from fixed to variable. The bolt can pivot within the limb pocket to accommodate the natural flexing motion, maintaining both stability and adaptability to the changing geometry of the bow limb during drawing.
Data Source
AI summary
An apparatus and method for reducing stress in a bow limb of an archery bow connected to a handle/riser of the bow by allowing a butt end of the bow limb connected to a forward end of the handle/riser by a limb bolt to flex forwardly when the bow is drawn and/or allowing the bow to flex rearwardly at the rearward end of the handle/riser when the bow is drawn.