Adjustable Spring Archery Bow Cam System
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Solution Overview
Problem
Traditional archery bows are limited by fixed poundage ranges, high holding forces at full draw, and lack of adjustability, making it difficult to manage high levels of stored energy and requiring specialized equipment for modifications or repairs, while spring-loaded bows are noisy and cumbersome.
Innovation Solution
A compound archery bow with a quiet, adjustable spring system incorporating a L-shaped crank and rotatable cam, allowing for adjustable stored energy and reduced holding forces, along with a modular design for easy disassembly and customization, including replaceable grips and ergonomic adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a traditional archery bow uses resilient limbs to store energy, then high stored energy can be achieved, but high holding forces at full draw make it difficult to hold and aim
Solution Approach 1:
The patent applies a dynamic cam system that changes the mechanical advantage throughout the draw cycle. The cam profile is designed to provide high mechanical advantage at full draw, reducing holding force to a manageable level, while allowing high energy storage during the drawing phase. This dynamic adjustment of force multiplication resolves the contradiction between storing high energy and maintaining low holding force.
Solution Approach 2:
The patent uses a variable ratio cam mechanism that changes the force transmission parameters throughout the draw cycle. By varying the cam radius and leverage ratio dynamically, the system achieves high energy storage capacity while maintaining low holding force at full draw through parameter optimization of the cam profile geometry.
2Power
If a traditional archery bow is designed for high stored energy, then arrow propulsion power increases, but the bow becomes difficult to modify or repair without specialized equipment
Solution Approach 1:
The patent segments the bow into modular components including the cam system, limbs, and riser that can be independently adjusted or replaced. The cam mechanism is designed as a separate adjustable module that can be modified without requiring specialized equipment, allowing users to change power levels and configurations easily while maintaining high propulsion capability.
Solution Approach 2:
The patent incorporates adjustable and interchangeable components that allow dynamic reconfiguration of the bow system. The cam profile, limb tension, and other parameters can be modified by the user without specialized tools, enabling easy adjustment of power levels and repair operations while maintaining high arrow propulsion capability.
3Use of energy by moving object
If a spring-loaded bow uses a tension spring through the riser to produce stored energy, then the bow can generate high energy, but the spring produces noise and wobble that affects accuracy
Solution Approach 1:
The patent replaces the traditional linear tension spring mechanism with a cam-based mechanical system. The cam mechanism converts rotational motion into the desired linear force application, eliminating the wobble and noise associated with conventional spring systems while maintaining high energy storage capability through optimized cam profile design.
Solution Approach 2:
The patent uses a dynamically balanced cam system that rotates smoothly to apply force to the string. The cam profile and mounting geometry are designed to minimize vibration and noise during operation, replacing the problematic reciprocating spring motion with a controlled rotational mechanism that maintains high energy transfer while reducing harmful vibrations and acoustic noise.
4Strength
If a compound archery bow uses fixed limbs and cam system, then structural strength is maintained, but the bow lacks adjustability for different archers and conditions
Solution Approach 1:
The patent divides the compound bow into modular segments including adjustable cam positions, interchangeable limbs, and configurable riser components. This segmentation allows individual parts to be adjusted or replaced to suit different archers and shooting conditions while maintaining the overall structural integrity and strength of the complete system.
Solution Approach 2:
The patent designs the cam and limb system with universal adjustment capabilities that allow a single bow structure to serve multiple functions and adapt to different users. The adjustable components enable the same basic structure to be optimized for various draw weights, arrow types, and shooting styles, combining structural strength with versatile adaptability.
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 bow system provides high shooting speeds with low holding forces at full draw, is quieter than traditional compound bows, and allows for easy adjustments and modifications without specialized equipment, enhancing usability and accuracy.
Implementation Method 1
a compression spring extending in the inner passage
Implementation Method 2
The cam having an outwardly facing cam shaped guide groove configured to support and guide a bow string about the rotatable cam
Implementation Method 3
The L-shaped crank having a first leg and a second leg extending from a common pivot portion and the crank being rotatable about a crank axis
Data Source
AI summary
A spring loaded compound archery bow and, more particularly, an archery bow having a firing system with a spring assembly and a crank having a first leg engagable against the spring of the spring assembly and second leg to support a rotatable archery cam.