Coffee Machine Hydraulic Piston Locking to Reduce Drive Complexity

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Solution Overview

Problem

Existing coffee machines, particularly fully automatic and semi-automatic machines, require additional components like drives for automating the brewing piston, leading to increased complexity, maintenance effort, and higher costs, while also being prone to malfunctions.

Innovation Solution

A coffee machine design that uses a control device to control a movably mounted brewing piston, which is locked in position using a hydraulic system, eliminating the need for additional drives by utilizing the water pump for both brewing water and piston movement, and incorporating a locking mechanism activated by hydraulic pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If additional drive devices are added to automate the brewing piston, then automation level increases, but device complexity and cost increase

Engineering Contradiction:

Improveautomation of brewing pistonVSAvoidcomplexity of drive devices

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

The water pump is designed to perform dual functions: delivering brewing water to the brewing chamber and simultaneously providing hydraulic pressure to move the brewing piston. This eliminates the need for a separate drive mechanism for the piston, reducing device complexity while maintaining automation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses hydraulic pressure generated by the water pump to actuate the brewing piston. By utilizing fluid pressure transmission, the invention achieves automated piston movement without requiring additional mechanical drive components, thereby simplifying the overall device structure.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Extent of automation

If additional drive devices are added to automate the brewing piston, then automation level increases, but maintenance effort increases

Engineering Contradiction:

Improveautomation of brewing pistonVSAvoidmaintenance effort

Core Design Contradiction:

Extent of automationVSEase of repair

Solution Approach 1:

By making the water pump perform dual functions (water delivery and piston actuation), the invention reduces the total number of drive devices that require maintenance. Fewer components mean less maintenance effort and lower service requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Extent of automation

If additional drive devices are added to automate the brewing piston, then automation level increases, but proneness to malfunctioning increases

Engineering Contradiction:

Improveautomation of brewing pistonVSAvoidmalfunctioning rate

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The invention reduces the number of independent drive systems by having the water pump perform dual functions. Fewer drive devices mean fewer potential failure points, thereby improving system reliability and reducing proneness to malfunctioning.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The water delivery function and piston actuation function are merged into a single hydraulic system. This integration reduces the number of separate mechanisms that could fail independently, enhancing overall system reliability.

Inventive Principle:

Principle #5Merging (Combining)

4Extent of automation

If additional drive devices are added to automate the brewing piston, then automation level increases, but cost increases

Engineering Contradiction:

Improveautomation of brewing pistonVSAvoidmanufacturing cost

Core Design Contradiction:

Extent of automationVSEase of manufacture

Solution Approach 1:

The water pump is designed to perform dual functions, eliminating the need for additional drive devices. This reduction in component count lowers manufacturing costs while maintaining the desired automation level.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The design achieves high automation with minimal drives, allows for precise coffee pressing control, prevents the brewing piston from moving back during brewing, and reduces the need for complex assemblies, thus lowering maintenance and costs.

Implementation Method 1

a piston drive which can be controlled via the control device, for moving the brewing piston from the initial position into the brewing position

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Implementation Method 2

a locking device with at least one locking body for locking the brewing piston in the brewing position

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Data Source

PatentUS20260000235A1Coffee machine and method for preparing a coffee drink

Publication Date: 2026.01.01 COFFEE VISION AG

AI summary

A coffee machine including a machine unit with a brewing piston which is movably mounted between an initial position and a brewing position, with a piston drive which can be controlled via the control device, for moving the brewing piston from the initial position into the brewing position, with a water preparation device with a water tank, a water pump and a heating unit, for generating and delivering hot brewing water under pressure into a brewing chamber as well as with a control device for the control of the coffee machine. The coffee machine includes a locking device with at least one locking body for locking the brewing piston in the brewing position.