Cordless Bandsaw Tethering and Blade Slip Control

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Solution Overview

Problem

Conventional power tools, such as bandsaws, lack adequate connectivity mechanisms for lanyards, leading to potential damage during falls, and often experience blade slippage issues that reduce torque transfer and tool effectiveness.

Innovation Solution

The bandsaw design incorporates an integrated transmission housing with a central opening for the motor output gear, a planetary gear system, and a tethering attachment assembly with a coil spring and wire for enhanced ergonomics and safety, along with angled chip grooves and brushes to prevent blade slippage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a compact power tool design is used, then ergonomics and portability are improved, but adequate locations for lanyard attachment are not provided

Engineering Contradiction:

Improvetool sizeVSAvoidlanyard attachment capability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent combines the lanyard attachment function with the existing tool housing structure by providing a tethering attachment assembly that integrates into the housing. This merging approach allows the compact tool to maintain both its small size and reliable lanyard attachment capability without adding separate external components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The tethering attachment assembly serves multiple functions: it provides secure lanyard attachment, absorbs impact energy during drops, and protects internal components. This multi-functionality allows the compact tool to achieve reliable safety features without increasing its volume.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Device complexity

If the tool housing directly absorbs drop impact energy, then lanyard attachment is simple, but internal components are damaged due to insufficient energy absorption

Engineering Contradiction:

Improveattachment mechanism simplicityVSAvoidinternal component protection

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent incorporates a tethering attachment assembly with energy-absorbing characteristics positioned to intercept drop impacts before they reach internal components. This beforehand cushioning approach protects vulnerable internal parts while maintaining a simple attachment mechanism.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The tethering attachment assembly acts as an intermediary between the external impact force and the internal components. It absorbs and dissipates impact energy, serving as a protective mediator that prevents direct transmission of damaging forces to sensitive internal parts.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If conventional bumper geometry and materials are used, then drop protection is provided, but heat generated from blade slippage damages the tire and reduces its useful life

Engineering Contradiction:

Improvedrop protectionVSAvoidtire temperature from blade slippage

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent extracts the heat generation problem from the tire-blade interface by addressing blade slippage separately. The bumper structure maintains its drop protection function while the blade guidance and tensioning systems prevent slippage-induced heating, effectively separating these two thermal and mechanical issues.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If blade tension is increased to prevent slippage, then torque transfer is improved, but the risk of blade breakage and damage to internal components increases

Engineering Contradiction:

Improvetorque transfer effectivenessVSAvoidblade breakage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes blade tension parameters within a specific range that balances torque transfer effectiveness with breakage prevention. By carefully controlling tension parameters and combining them with proper blade routing and guidance, the system achieves reliable torque transfer without exceeding the blade's structural limits.

Inventive Principle:

Principle #35Parameter changes

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 solution provides improved ergonomics, increased tool safety through effective lanyard attachment, and enhanced cutting performance by reducing blade slippage and extending tool life by dissipating heat and absorbing energy from drops.

Implementation Method 1

a tethering attachment assembly with a coil spring and wire for enhanced ergonomics and safety, and angled chip grooves and brushes to prevent blade slippage

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

when a blade slips relative to a tire, friction and heat may be generated. Any generated heat may damage the tire and reduce the tire's useful life

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20250018481A1bandsaw

Publication Date: 2025.01.16 BLACK & DECKER CORP

AI summary

The present disclosure is directed to a bandsaw. The bandsaw may be cordless bandsaw utilizing a battery pack to provide power to an electric motor. The electric motor may drive an transmission. The transmission may be mechanically coupled to a drive wheel. The drive wheel, in conjunction with a driven wheel turn a blade for a cutting operation. The bandsaw may include a base for housing the drive and driven wheels. The base may also include an integrated transmission housing for housing the transmission.