Capsule and Brew Chamber Assembly with Self-Centering Slanted Bottom

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Solution Overview

Problem

Capsule-based beverage preparation machines face issues with proper sealing of the brew chamber due to misalignment of the capsule, leading to leakage and inconsistent beverage quality, especially when dedicated centering elements are absent in the brew chamber.

Innovation Solution

The design incorporates a capsule with a slanted wall portion around its longitudinal axis, which allows knives in the brew chamber to slip and self-center the capsule, ensuring alignment with the brew chamber's central axis before piercing, thereby achieving a secure seal without the need for dedicated centering elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a capsule is loaded into a brew chamber without dedicated centering elements, then the device complexity is reduced, but the capsule alignment precision deteriorates leading to leakage

Engineering Contradiction:

Improvebrew chamber structureVSAvoidcapsule alignment

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The capsule bottom is designed with an asymmetric slanted surface instead of a symmetric flat surface. This slanted surface creates a self-centering mechanism where the capsule automatically aligns with the brew chamber central axis during insertion, eliminating the need for dedicated centering elements while maintaining precise alignment.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The capsule's slanted bottom surface enables self-centering functionality. When the capsule is inserted into the brew chamber, the slanted surface interacts with the chamber walls to automatically position the capsule at the correct location and orientation, making the system self-aligning without external centering mechanisms.

Inventive Principle:

Principle #25Self-service

2Ease of manufacture

If the capsule bottom is made flat for simplicity, then the ease of manufacture is improved, but the sealing reliability deteriorates due to misalignment

Engineering Contradiction:

Improvecapsule bottom fabricationVSAvoidbrew chamber sealing

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The capsule bottom transitions from a flat symmetric design to a slanted asymmetric design. This modification maintains manufacturing feasibility while creating a self-centering effect that ensures reliable sealing by preventing misalignment between the capsule and brew chamber during operation.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The slanted surface on the capsule bottom introduces a curved geometric feature that facilitates self-centering. This curved surface interacts with the brew chamber walls to guide the capsule into proper alignment, improving sealing reliability without significantly complicating the manufacturing process.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Manufacturing precision

If dedicated centering elements are added to the brew chamber, then the capsule alignment precision is improved, but the device complexity increases

Engineering Contradiction:

Improvecapsule alignmentVSAvoidbrew chamber structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Instead of adding centering elements to the brew chamber (external centering), the centering functionality is inverted and integrated into the capsule itself through the slanted bottom surface. This approach transfers the centering function from the chamber to the capsule, simplifying the overall system.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The capsule with its slanted bottom surface performs self-centering without requiring external centering mechanisms in the brew chamber. The capsule's own geometry enables it to automatically align with the chamber, eliminating the need for additional centering elements and reducing device complexity.

Inventive Principle:

Principle #25Self-service

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

This self-centering mechanism ensures optimal sealing of the brew chamber, reducing leakage and maintaining consistent beverage quality by aligning the capsule correctly before piercing, even in machines without dedicated centering features.

Implementation Method 1

the slanted wall portion being oriented under an angle with the longitudinal axis, for centering the capsule relative to a central axis of the brew chamber prior to piercing of the capsule due to slipping of the at least one of the knives upon engaging of the at least one knife on the slanted wall portion

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11540659B2Assembly of a capsule and a brew chamber

Publication Date: 2023.01.03 KONINK DOUWE EGBERTS BV

AI summary

The document describes an assembly of a capsule (5) and brew chamber (3) for a beverage preparation machine. The brew chamber (3) has a first brew chamber part (7) including a cavity (10) for the capsule (5), and knives (11) for piercing the capsule (5). The aluminum capsule body (15) is frusto conical shaped and has a bottom (20), a side wall (21), a flange (22) and a lid (17) for closing the capsule (5). The flange (22) is configured to be held between the first and a second brew chamber parts (7, 8), to provide a seal (30) cooperating with a rim of the brew chamber parts (7, 8). The bottom (20) includes a slanted wall portion (35) under an angle with a longitudinal axis through the capsule (5), and configured for cooperating with the knives (11) which engage therewith upon closing of the brew chamber (3). This enables centering of the capsule (5) relative to the central axis of the brew chamber (3) prior to piercing of the capsule.