Motorized Archery Bow Draw Force Amplifier

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Solution Overview

Problem

Current mechanical devices for increasing draw force in compound bows are often heavy, difficult to use, noisy, and inefficient, making them unsuitable for hunting environments, particularly for individuals with less strength such as youths, females, disabled, and elderly people who cannot meet the minimum power requirements.

Innovation Solution

A power-assisted draw weight amplifier system integrated into the bow riser, utilizing pneumatic cylinders, worm gears, and electric motors to provide additional force to the limb bolts, with a switch device for activation and deactivation, and a pneumatic or electrical accumulator for power, ensuring low weight, low vibration, and low noise operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If mechanical devices are added to increase draw force, then the power and range are improved, but the weight and complexity of the bow assembly increase

Engineering Contradiction:

Improvedraw forceVSAvoidbow assembly weight

Core Design Contradiction:

PowerVSWeight of moving object

Solution Approach 1:

The power assist device is nested within the bow's riser structure, with the motor and transmission components housed inside the existing bow frame. This integration allows the power assistance system to occupy minimal additional space and adds minimal weight while delivering the required draw force enhancement.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

A transmission mechanism serves as an intermediary between the motor and the bowstring, transferring power efficiently while allowing the motor to be positioned away from the bowstring attachment point. This intermediary system optimizes the weight distribution and reduces the impact on the bow's overall balance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If mechanical devices are added to increase draw force, then the power and speed are improved, but the noise and vibration levels increase

Engineering Contradiction:

Improvedraw forceVSAvoidnoise and vibration

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The power assist device uses a pneumatic or hydraulic actuator instead of a direct mechanical linkage. This fluid-based transmission system inherently dampens vibrations and reduces mechanical noise while delivering the required force to assist the archer in drawing the bow.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The motor operates at optimized rotational speeds and torque levels that minimize vibration generation. The transmission system is designed with damping characteristics that filter out harmful vibrations, and the overall system parameters are tuned to operate in a quiet, smooth manner suitable for hunting environments.

Inventive Principle:

Principle #35Parameter changes

3Power

If mechanical devices are added to increase draw force, then the power capacity is improved, but the ease of operation and maintenance difficulty worsen

Engineering Contradiction:

Improvedraw forceVSAvoidoperation simplicity

Core Design Contradiction:

PowerVSEase of operation

Solution Approach 1:

The power assist device incorporates automatic engagement and disengagement mechanisms that activate based on the bow's draw cycle. The system automatically provides assistance when needed and retracts when not needed, eliminating the need for manual intervention and reducing operational complexity for the user.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The power assist device is designed to work with multiple bow models and configurations, using standardized mounting interfaces and power connections. This universal design simplifies installation, operation, and maintenance across different user groups including youths, females, disabled, and elderly people.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables individuals with less strength to meet the minimum power requirements for hunting, providing additional power for long-distance shooting or big game hunting while maintaining ease of use and reducing the weight and noise of the bow assembly.

Implementation Method 1

pneumatic driven cylinders mounted inside the riser construction provides additional power to power assisted draw weight amplifier devices arranged to exert a pulling force on the limb bolts

Methodology Applied

Scientific EffectPneumatic pressure: Pressurisation

Implementation Method 2

worm gears and electric motors which are mounted inside the riser construction provides additional power to power assisted draw weight amplifier devices

Methodology Applied

Scientific EffectMechanical advantage: Mechanical Advantage

Implementation Method 3

worm gears and electric motors which are mounted inside the riser construction provides additional power

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 4

a pneumatic or electrical accumulator for power

Methodology Applied

Scientific EffectEnergy accumulation: Accumulator (energy)

Data Source

PatentUS11802749B2Motorized archery bow and method

Publication Date: 2023.10.31 KRYSSE AS

AI summary

An archery bow is disclosed herein. The archery bow, in an embodiment, includes a frame, a plurality of limbs coupled to the frame, and an electrical motor coupled to the frame. The archery bow also includes at least one rod that is operatively coupled to the electrical motor as well as one or more of the limbs.