Drop-Away Arrow Rest Torque Transfer Launcher

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Solution Overview

Problem

Existing drop-away arrow rests often cause the arrow to come off the rest during the draw cycle due to premature raising, require recocking after each shot, and may interfere with the arrow's flight or contribute to bow tension.

Innovation Solution

A drop-away arrow rest system utilizing a torque transfer system, such as a rotary damper or centrifugal force system, to rotate the launcher from an up position to a down position when the bow is shot, ensuring the arrow remains supported and avoiding interference with the arrow's flight, and automatically returning to the up position after clearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the arrow rest is raised into the up position during the draw cycle, then the arrow is positioned for the shot, but the arrow tends to come off the rest while in motion

Engineering Contradiction:

Improvearrow positioningVSAvoidarrow retention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The arrow rest employs a dynamic mechanism that transitions from a static raised position to a controlled dropping motion. The launcher is rotated from the up position to a down position using a torque transfer system actuated by the bow's movement, allowing the rest to adapt its position throughout the shot cycle rather than remaining fixed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A torque transfer system serves as an intermediary between the bow's motion and the arrow rest's movement. This intermediary mechanism transfers rotational motion from the bow to the launcher, enabling controlled rotation without direct mechanical connection, thus preventing the arrow from coming off while maintaining positioning.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the arrow rest is designed to drop away immediately upon firing, then interference with arrow flight is eliminated, but the archer must recock the rest after each shot

Engineering Contradiction:

Improveinterference with arrow flightVSAvoidrecocking requirement

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The arrow rest is designed to automatically return to the up position after the arrow clears the rest, eliminating the need for manual recocking. The torque transfer system and launcher mechanism self-reset through the natural motion of the bow, providing continuous service without archer intervention.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The arrow rest maintains continuous useful action by automatically cycling through up and down positions without interruption. The system ensures the rest is in the correct position for each shot without requiring manual resetting, providing uninterrupted service throughout the shooting sequence.

Inventive Principle:

Principle #20Continuity of useful action

3Speed

If the arrow rest is raised quickly into the up position, then the arrow is positioned rapidly, but the rest may contribute to bow tension

Engineering Contradiction:

Improverest positioning speedVSAvoidbow tension

Core Design Contradiction:

SpeedVSForce

Solution Approach 1:

The torque transfer system acts as an intermediary that decouples the rapid positioning function from the tension-generating mechanism. It transfers rotational motion from the bow to the launcher while isolating the arrow rest from direct tension forces, allowing quick positioning without contributing to bow tension.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 arrow rest system provides stable arrow support during the shot, eliminates the need for recocking, and does not contribute to bow tension, ensuring accurate and consistent arrow flight without interference.

Implementation Method 1

a rotary damper configured to provide a torque-dependent motion transmittal from the actuation arm to the launcher so that when the archery bow is shot the launcher is rotated from the up position to a down position

Methodology Applied

Scientific EffectRotary damper: Viscous Damping

Implementation Method 2

a speed-sensitive torque transfer system configured to transfer at least a portion of the rotating motion of the actuating element to the launcher so that when the archery bow is shot the actuation element rotates the launcher from the up position to a down position

Methodology Applied

Scientific EffectSpeed-sensitive torque transfer: Centrifugal Force

Data Source

PatentUS10156418B2Arrow rest

Publication Date: 2018.12.18 NYSTROM DAN

AI summary

A drop-away arrow rest for an archery bow is provided that utilizes a torque transfer system to transfer a rotational motion from an actuation element to a launcher configured to support the shaft of an arrow when the launcher is in an up position. The rotational motion causes the launcher to rotate from an up position to a down position while the archery bow is shot. After the arrow has cleared the launcher, the arrow rest described herein is configured to automatically return to the up position.