Rigid Riser Compound Bow Axle Distance Consistency

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Solution Overview

Problem

Traditional compound archery bows rely on flexible limbs to store energy, which can lead to inconsistencies in performance due to the flexibility of the limbs, affecting the fixed axle-to-axle distance during the draw and release cycle.

Innovation Solution

A rigid riser structure with rotatable elements directly connected to it, and flexible limb assemblies mounted to the riser with fixed positions, maintaining a constant axle-to-axle distance and storing energy through a cable system that flexes the limbs towards cams.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If flexible limbs are used to store energy in traditional compound bows, then energy storage capability is improved, but the axle-to-axle distance becomes inconsistent during the draw and release cycle

Engineering Contradiction:

Improveenergy storage capabilityVSAvoidaxle-to-axle distance consistency

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent divides the traditional flexible limb system into separate components: a rigid riser assembly with fixed axle-to-axle distance and flexible limb assemblies that are independently mounted. This segmentation allows the rigid portion to maintain consistent geometry while the flexible portions provide energy storage, resolving the contradiction between energy storage and distance consistency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using flexible limbs to maintain axle-to-axle distance as in traditional bows, the patent inverts the approach by using a rigid riser structure to maintain the fixed distance and allowing the flexible limbs to move independently. This inversion resolves the contradiction by reversing which component maintains geometry and which provides flexibility.

Inventive Principle:

Principle #13The other way round (Inversion)

2Use of energy by moving object

If flexible limbs are used for energy storage, then energy storage is improved, but performance consistency deteriorates due to limb flexibility

Engineering Contradiction:

Improveenergy storageVSAvoidperformance consistency

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

By separating the rigid riser assembly from the flexible limb assemblies, the patent allows each component to be optimized independently. The rigid riser ensures consistent performance and geometry, while the flexible limbs provide energy storage, resolving the contradiction between energy storage and performance consistency.

Inventive Principle:

Principle #1Segmentation

3Reliability

If a rigid riser structure with directly connected rotatable elements is used, then axle-to-axle distance consistency is improved, but device complexity increases

Engineering Contradiction:

Improveaxle-to-axle distance consistencyVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The rigid riser assembly serves multiple functions: it maintains fixed axle-to-axle distance, provides mounting points for flexible limb assemblies, and supports the cable system. This multi-functionality reduces the need for additional components, offsetting the increased complexity of the rigid structure with functional consolidation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Manufacturing precision

If flexible limb assemblies are mounted to the riser with fixed positions, then energy storage consistency is improved, but ease of manufacture deteriorates

Engineering Contradiction:

Improveenergy storage consistencyVSAvoidassembly complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent segments the bow into a rigid riser assembly and separately mounted flexible limb assemblies. This segmentation allows the flexible limbs to be pre-assembled and tested independently, then mounted to the riser with fixed positions to ensure consistent energy storage, balancing manufacturing precision with ease of assembly.

Inventive Principle:

Principle #1Segmentation

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

This design provides consistent energy storage and release, reducing vibration and maintaining a fixed axle-to-axle distance, enhancing the performance and reliability of the compound bow system.

Implementation Method 1

flexible limb assemblies mounted to the rigid riser assembly with the moveable ends spaced away from and oriented in selected manners relative to the cams... As the bowstring is drawn, the flexible limb or limbs are flexed toward the cams

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9310155B2Compound bow system

Publication Date: 2016.04.12 BEAR ARCHERY

AI summary

Certain embodiments of the present disclosure describe a compound archery bow that has a rigid vertical riser structure. At least one flexible limb extends rearward from the vertical riser structure. One end of the flexible limb is secured to the cable arrangement of the compound bow, so that when the bowstring is drawn, the flexible limb is flexed toward the cams of the bow. As the flexible limb is bent, it stores energy that is transferred to an arrow when the bowstring is released.