Inertial Fall Detection for Power Tool Battery Damage

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Solution Overview

Problem

Power tools and rechargeable batteries often suffer undetectable damage from critical falls, making it difficult for users to determine if further use is safe.

Innovation Solution

An apparatus with an inertial body held by three electrical conductors, where a voltage measuring device detects a predetermined acceleration threshold, causing conductivity impairment and indicating a critical fall through voltage changes, and a rechargeable battery with control electronics that prevents further use if damage is detected.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If power tools and rechargeable batteries are designed to be robust, then they can withstand normal use and handling, but they may suffer undetectable damage from critical falls

Engineering Contradiction:

ImproverobustnessVSAvoiddetectability of damage

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent introduces an inertial body as an intermediary element that mediates between the mechanical impact of a fall and the electronic detection system. The inertial body, when subjected to sudden acceleration during a critical fall, causes electrical conductors to break or change conductivity, thereby converting mechanical impact into detectable electrical signals without requiring the main device structure to show visible damage

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical damage detection with an electrical detection system. Instead of relying on visible mechanical damage to power tools or batteries, the system uses voltage measuring devices to detect changes in electrical conductor conductivity caused by inertial body movement during falls, substituting mechanical inspection with electrical measurement

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If users rely on visible damage to determine safety after a fall, then simple inspection is possible, but undetectable damage remains undetected creating safety hazards

Engineering Contradiction:

Improvesimplicity of inspectionVSAvoidundetected damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The detection apparatus enables the power tool or battery to self-diagnose damage automatically. The voltage measuring device continuously monitors conductor integrity, and when a critical fall occurs causing conductor breakdown, the system automatically detects and indicates the damage without requiring user inspection, thereby providing both ease of operation and detection of hidden damage

Inventive Principle:

Principle #25Self-service

3Device complexity

If no detection system is implemented, then device complexity remains low, but users cannot determine whether further use is safe after a fall

Engineering Contradiction:

Improvedetection system complexityVSAvoidsafety status information

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The detection system is segmented into independent functional components: an inertial body, separate electrical conductors for each principal axis, and a voltage measuring device. This segmentation allows the system to detect falls from multiple directions independently while maintaining relatively simple individual component designs, reducing overall system complexity while providing comprehensive safety information

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

Effectively detects critical falls and prevents further use of damaged power tools or batteries, ensuring user safety by indicating damage and preventing potential hazards like short circuits.

Implementation Method 1

at least one inertial body that is held by three electrical conductors along the three principal inertial axes of the inertial body

Methodology Applied

Scientific EffectInertia: Inertia

Implementation Method 2

when a predetermined acceleration threshold value for the inertial body is reached

Methodology Applied

Scientific EffectAcceleration: Accelerometer

Data Source

PatentUS12259404B2Apparatus for detecting a critical fall

Publication Date: 2025.03.25 HILTI AG

AI summary

An apparatus contains an inertial body held by three electrical conductors along the three principal inertial axes, wherein a voltage is applied to each of the three electrical conductors and are configured such that when a predetermined acceleration threshold value for the inertial body is reached the conductivity of at least one electrical conductor is impaired such that the reaching of a predetermined threshold value is detectable by the voltage measuring device. A rechargeable battery having an apparatus for detecting a critical fall and a method involving detecting three voltages are also provided.