Worm-Shaft Coffee Brewing for Variable Volume Extraction
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Solution Overview
Problem
Existing devices for preparing hot beverages, such as espresso coffee, are limited in their ability to vary the volume of the drink portion and often result in a decrease in the proportion of soluble ingredients, leading to an adverse change in taste and caffeine content during the extraction process.
Innovation Solution
A device with a worm shaft that extends through a brewing and squeezing zone, featuring a conical narrowing of the housing and varying pitch of the worm blade, allowing for adjustable compression and extraction of coffee powder, enabling the preparation of a wide range of drink volumes with improved extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a predetermined amount of coffee powder is used in a fixed brewing chamber, then the device structure is simple, but the volume of the drink portion cannot be varied freely
Solution Approach 1:
The patent applies dynamics by making the brewing chamber volume variable through a movable piston that can be positioned at different heights. This allows the same device to accommodate different amounts of coffee powder and produce different drink volumes (espresso, lungo, cappuccino) without requiring multiple fixed chambers, thus resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The brewing chamber is segmented into multiple zones (first brewing zone, second brewing zone, squeezing zone) with different functions. This segmentation allows each zone to be optimized for its specific purpose while collectively enabling variable drink preparation, balancing adaptability with manageable device complexity
2Manufacturing precision
If the same amount of coffee powder is used for different drink volumes, then the device operation is simple, but the proportion of soluble ingredients decreases leading to adverse taste change
Solution Approach 1:
The patent applies local quality by creating different brewing conditions in different zones of the brewing chamber. The first brewing zone operates with different parameters than the second brewing zone, which in turn differs from the squeezing zone. This allows each zone to contribute differently to the extraction process, maintaining uniform extraction quality across varying drink volumes without complicating operation
Solution Approach 2:
The movable piston enables dynamic adjustment of the brewing chamber volume to match the desired drink type. This dynamic configuration ensures that the appropriate amount of coffee powder is used for each drink volume, maintaining consistent extraction quality and taste across different beverage preparations
3Productivity
If the brewing chamber volume is increased to prepare larger drinks, then the drink volume can be increased, but the extraction time increases causing taste deterioration and excessive caffeine extraction
Solution Approach 1:
The extraction process is segmented into two distinct brewing zones followed by a squeezing zone. This segmentation allows the extraction to be completed efficiently in the first two zones, after which the squeezing zone rapidly removes the remaining liquid without requiring prolonged extraction time. This resolves the contradiction by enabling larger drink volumes without excessive extraction time or taste deterioration
Solution Approach 2:
The patent implements continuous useful action by immediately transitioning from the brewing zones to the squeezing zone without idle time. The squeezing zone continuously extracts remaining liquid from the coffee powder, ensuring that the extraction process is completed efficiently regardless of the total drink volume, thus maintaining high productivity and preventing taste deterioration
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
Enables the preparation of high-quality coffee beverages with adjustable strength and caffeine content, ensuring uniform extraction and consistent flavor across varying volumes, from small to large quantities, while minimizing waste and optimizing coffee powder usage.
Implementation Method 1
a squeezing zone (25) in which the particulate substance or coffee powder is compressed
Implementation Method 2
a brewing zone (24) in which the particulate substance or coffee powder is brewed by means of scalding water
Implementation Method 3
the proportion of soluble ingredients, in particular coloring, flavoring and aromatic substances, in the coffee powder gradually decreases
Data Source
Figure 1
Figure 2
Figure 3~6
AI summary
The coffee maker (1) has a delivery member including a screw shaft (10) provided with a flight (13) for feeding a coffee powder i.e. caffeine, into and out of a brewing zone (24) in a common direction. An extraction zone (25) is in downstream of the brewing zone in which the powder is compacted and the essence of the powder is extracted, where the screw shaft extends along the brewing zone and along the extraction zone. A pitch of the flight in the region of the extraction zone is smaller than another pitch of the flight in the region of the brewing zone. An independent claim is also included for a method for the preparation of hot beverages.