Rescue Cutter Orientation Feedback Under High Cutting Load

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Solution Overview

Problem

Portable motor-driven rescue devices used for cutting hard materials often experience rotational instability under load, leading to potential component failure and operator injury due to increased pressure and force buildup, which existing technologies fail to adequately address.

Innovation Solution

The method involves monitoring the angular position and force applied by the cutting tool relative to the object, using the electric motor's current to derive pressure, and comparing these parameters with setpoints to trigger control events such as warnings or motor control adjustments to prevent overload and maintain operational safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If the cutting device applies increasing force to penetrate hard materials, then the cutting ability is improved, but the device begins to rotate under load causing component strain and potential failure

Engineering Contradiction:

Improvecutting forceVSAvoidcomponent reliability

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The control unit continuously monitors the angular position of the cutting device relative to the object and uses this feedback to adjust the motor's force application. When rotation is detected, the system reduces force or adjusts positioning to prevent component failure, creating a closed-loop control system that balances cutting effectiveness with device safety

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the cutting force based on real-time angular position data. Rather than applying constant maximum force, the motor control is modified according to the device's rotational state, allowing optimal force application during stable cutting while preventing overload during rotational instability

Inventive Principle:

Principle #15Dynamics

2Duration of action of moving object

If the cutting blades are spread further apart under rotational load, then the cutting action continues, but the central bolt and components come under increasing strain leading to breakage

Engineering Contradiction:

Improvecutting durationVSAvoidcomponent strength

Core Design Contradiction:

Duration of action of moving objectVSStrength

Solution Approach 1:

The control system takes preliminary action by detecting angular deviation before components reach their breaking point. When rotation is detected, the system preemptively reduces force or stops operation to prevent bolt failure, rather than waiting for damage to occur

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

Continuous monitoring of angular position provides real-time feedback on component strain conditions, allowing the control unit to adjust operating parameters before critical failure occurs

Inventive Principle:

Principle #23Feedback

3Productivity

If the cutting device rotates relative to the object under load, then the cutting blades spread apart, but this causes components to break and creates safety hazards

Engineering Contradiction:

Improvecutting speedVSAvoidsafety hazards

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The angular position sensor provides continuous feedback on device orientation, allowing the control unit to detect rotation and immediately respond by reducing force or stopping operation, preventing component failure and safety hazards while maintaining productivity during stable cutting

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces purely mechanical cutting with a controlled electromechanical system that uses electronic sensors and control units to monitor and regulate the cutting process, substituting mechanical robustness with electronic control to prevent hazardous situations

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11794041B2Method for operating a working device or rescue device, and working device or rescue device

Publication Date: 2023.10.24 LUKAS HYDRAULIK

AI summary

A method for operating an electromechanical or electrohydraulic working device or rescue device is performed by an operator person and can be used autonomously. The working/rescue device includes a cutting tool having two cutting tool halves movable toward and away from one another and define a virtual cutting plane by their movement. The working/rescues device includes a housing, an electric motor; a pump or mechanical transmission, each driven by the electric motor for actuating the tool insert. An exchangeable rechargeable electrical energy source is in/on a device side of the working/rescue device and includes a housing. During operation of the working/rescue device, orientation of the working/rescue device is sensed and the relationship between the angular position of the working/rescue device cutting plane and the force applied by the cutting tool to the object to be cut is established and the working/rescue device is controlled in dependence on the relationship.