Household appliance and method for operating a household appliance

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Solution Overview

Problem

Existing laundry treatment appliances require extensive disassembly and risk damage when replacing the rotary user interface knob, as it is often damaged during handling and transport, necessitating a more efficient and damage-free removal process.

Innovation Solution

A two-part design for the rotary user interface knob, comprising a knob cover element and a knob carrier element with a snap connection, allowing the knob to be partially extracted and detached using a tool without disassembling the control panel, enabling quick and reliable replacement without affecting stability or reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the knob is made protruding from the control panel for easy access, then the ease of operation is improved, but the reliability deteriorates due to damage during handling and transport

Engineering Contradiction:

Improveknob accessibilityVSAvoidknob durability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The knob is divided into two separate parts: a knob body that remains integrated with the control panel, and a knob cover that can be removed and replaced independently. This segmentation allows the protruding cover to be replaced without damaging the integrated body, resolving the contradiction between accessibility and durability.

Inventive Principle:

Principle #1Segmentation

2Shape

If the knob is assembled from the inside of the control panel, then the visual appearance is improved without gap, but the ease of repair deteriorates requiring panel disassembly

Engineering Contradiction:

Improvevisual appearanceVSAvoidknob replacement complexity

Core Design Contradiction:

ShapeVSEase of repair

Solution Approach 1:

The knob cover is extracted as a separate replaceable component that can be removed from the outside of the control panel. This allows the visual appearance to be maintained when assembled, while enabling easy replacement by simply removing the cover without disassembling the control panel structure.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of repair

If the knob is made fully removable for easy replacement, then the ease of repair is improved, but the reliability deteriorates due to potential loss or misalignment

Engineering Contradiction:

Improveknob replacement simplicityVSAvoidknob positioning accuracy

Core Design Contradiction:

Ease of repairVSReliability

Solution Approach 1:

Different parts of the knob assembly have different degrees of removability. The knob cover is designed for easy removal and replacement with precise positioning features, while the knob body remains permanently integrated with the control panel. This local differentiation allows easy repair of the cover while maintaining reliable positioning of the entire knob assembly.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3447182B1Household appliance and method for operating a household appliance

Publication Date: 2021.08.04 ELECTROLUX APPLIANCES

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Figure 2
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AI summary

Household appliance (2), comprising a control panel (62) on which a user interface element is provided which comprises a knob (44) which is associated with a selector, whereby said knob (44) is partially extractable from said control panel (62) from a first inserted position to a second extracted position in which said knob (44) is in a non-operating position but axially constrained by said panel (62) for a complete disassembly from said appliance (2).