Door-Mounted Detergent Dispenser Grids for Front-Load Washers

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Solution Overview

Problem

Front-loading laundry washing machines with door-mounted dispensers suffer from inconsistent wash performance due to laundry items obstructing the dispenser inlet, leading to incomplete agent drainage and variable wash results.

Innovation Solution

Incorporating grids at the dispenser inlets to prevent laundry items from entering and obstructing the water flow, while allowing water to carry washing agents into the machine, with optional mobility and retaining features for easy loading and operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the dispenser inlet is open to allow water flow, then water can carry washing agents into the tub effectively, but laundry items may enter the dispenser and obstruct the inlet or absorb washing agents

Engineering Contradiction:

Improvewashing agent drainage efficiencyVSAvoidwash performance consistency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A grid is introduced as an intermediary element at the dispenser inlet. This grid allows water to pass through freely while blocking laundry items from entering the dispenser. The grid acts as a mediator that separates the function of water flow (which should be unrestricted) from the function of preventing foreign object entry (which requires blocking), thereby resolving the contradiction between maintaining open inlet for effective washing agent drainage and preventing obstruction by laundry items.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the dispenser inlet is blocked to prevent laundry items from entering, then wash performance consistency improves, but water flow to carry washing agents is obstructed

Engineering Contradiction:

Improvewash performance consistencyVSAvoidwashing agent drainage efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The grid introduces local quality differentiation at the dispenser inlet. Instead of uniformly blocking or opening the entire inlet, the grid provides selective permeability - it is solid in areas that block laundry items while maintaining open spaces that allow water flow. This local quality approach enables the inlet to simultaneously achieve both functions: preventing laundry item entry while maintaining effective water flow for washing agent drainage.

Inventive Principle:

Principle #3Local quality

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

Ensures consistent wash performance by ensuring complete agent drainage and preventing obstruction, resulting in more reliable wash results regardless of load conditions.

Implementation Method 1

water sprinkled onto dispenser (6) by a hydraulic system adapted to supply water from the household water main

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

grids (11) located at water inlets (61) of the dispenser... While still allowing water to flow into the dispenser, the grids will reduce the risk that any laundry item may enter into the dispenser

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentEP1951947B1Front-loading laundry washing machine

Publication Date: 2009.03.04 INDESIT COMPANY SPA

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AI summary

The present invention relates to a front-loading laundry washing machine wherein a cabinet (2) comprises a load opening (4) which can be closed by- means of a door (5) provided with a washing agent dispenser. A hydraulic system (7a, 7b, 8, 9a, 9b) of the washing machine sprinkles water onto at least one dispenser inlet, at which a grid (11) is installed.