Crossbow Rail Segmented Arrow Rest Areas

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Solution Overview

Problem

Existing crossbow designs face challenges in reducing friction during arrow launch and ensuring stability, particularly with the risk of a crooked barrel affecting arrow flight.

Innovation Solution

A crossbow barrel with a bowstring rail featuring spaced arrow rest areas, including a first rest area adjacent to the bowstring rail end and a second rest area beneath an arrow retention spring, which stabilizes the arrow prior to launch and reduces friction by keeping the arrow out of contact with the rail except in these areas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a continuous groove is provided in the barrel to guide the arrow, then the arrow is guided throughout launch, but friction increases during launch

Engineering Contradiction:

Improvearrow guidance stabilityVSAvoidfriction during launch

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The continuous groove is segmented into discrete contact points (first and second rest areas) along the rail. This segmentation allows the arrow to be supported at critical locations while eliminating continuous contact, thereby reducing friction during launch while maintaining guidance stability at key positions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of providing uniform guidance along the entire rail, the invention concentrates guidance functionality at specific local areas (rest areas) where the arrow needs support. The rail surface is modified locally at these rest areas to provide contact, while remaining smooth and frictionless in between, optimizing both guidance and reduced friction.

Inventive Principle:

Principle #3Local quality

2Loss of energy

If a rest is provided only at the end of the barrel, then friction is reduced, but arrow stability is insufficient

Engineering Contradiction:

Improvefriction during launchVSAvoidarrow stability prior to launch

Core Design Contradiction:

Loss of energyVSStability of the object's composition

Solution Approach 1:

The single rest at the barrel end is segmented into multiple rest areas distributed along the rail. This includes a first rest area near the bowstring and a second rest area beneath the retention spring, providing distributed support points that enhance arrow stability while maintaining low friction during launch.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rest areas are positioned to provide preliminary support and stabilization of the arrow before launch occurs. The first rest area stabilizes the arrow tip near the bowstring, while the second rest area supports the arrow shaft, ensuring the arrow is properly positioned and stable prior to firing.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the arrow is in continuous contact with the rail, then guidance is maintained, but the likelihood of crooked barrel affecting flight increases

Engineering Contradiction:

Improvearrow guidanceVSAvoidcrooked barrel effect on flight

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The continuous contact between arrow and rail is segmented into discrete rest areas. This reduces the cumulative effect of any barrel irregularities or crookedness, as the arrow only contacts the rail at specific points rather than along the entire length, minimizing the transmission of barrel defects to arrow flight.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The harmful continuous contact is extracted and replaced with minimal necessary contact at rest areas. This removes the mechanism by which a crooked barrel would continuously affect the arrow, while retaining sufficient contact points to maintain proper arrow alignment and guidance.

Inventive Principle:

Principle #2Taking out (Extraction)

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 enhances arrow stability and accuracy by minimizing friction and eliminating destabilization risks, allowing for a more consistent and straight arrow flight.

Implementation Method 1

An arrow retention spring is carried by the barrel for releasably holding the arrow on the arrow support area prior to launch

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9599426B2Crossbow with improved rail and arrow slot

Publication Date: 2017.03.21 DARTON ARCHERY LLC

AI summary

A crossbow includes a barrel having a bowstring rail with a slot including spaced first and second arrow rest areas aligned along said bowstring rail and an arrow clearance area therebetween, and an arrow retention spring carried by the barrel. The first arrow rest area is positioned adjacent to an end of the bowstring rail, and the second arrow rest area is positioned beneath the arrow retention spring directly beneath said arrow retention spring in a location where said arrow retention spring is adapted to contact said arrow. Provision of the spaced rest areas, particularly the second rest area beneath the arrow retention spring, stabilizes an arrow on the barrel prior to launch.