Low-Pressure Brew Chamber With Piston Extraction and Grounds Removal
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Solution Overview
Problem
Existing coffee brewing methods are either time-consuming, do not produce full-bodied coffee, or require high pressures and temperatures, which may not be preferred by all consumers.
Innovation Solution
A brew group system with a cylindrical brewing chamber, piston assemblies, and actuators that allow for controlled movement and sealing, enabling rapid brewing with pressurized water while maintaining the benefits of suspended coffee grounds, and a flexible sliding arm assembly for efficient removal of spent grounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pressure brewing methods are used, then brewing speed is improved, but pressure requirements increase to 8-9 atmospheres
Solution Approach 1:
The patent changes the pressure parameter from high (8-9 atmospheres in traditional espresso) to low (1-3 atmospheres), achieving rapid brewing without requiring high pressure. This is accomplished through a unique chamber design that allows water to be forced through coffee grounds at reduced pressure while maintaining extraction efficiency.
2Speed
If high pressure and temperature are used, then brewing speed is improved, but flavor intensity increases which may not be preferred by all consumers
Solution Approach 1:
The patent modifies the pressure and temperature parameters to achieve a balanced brewing process. By using low pressure (1-3 atmospheres) and controlled temperature, the system produces a milder flavor profile that appeals to broader consumer preferences while maintaining fast brewing speed.
3Speed
If filtration methods are used, then brewing speed is improved, but coffee body and flavor quality deteriorate
Solution Approach 1:
The brewing chamber is segmented into distinct zones that allow for controlled water flow through coffee grounds. This segmentation enables the system to achieve both rapid brewing and high-quality extraction by managing water-coffee contact in a structured manner, producing full-bodied coffee without sacrificing speed.
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 system achieves rapid brewing with optimal flavor, reducing brewing time and pressure requirements while ensuring efficient coffee extraction and easy cleanup.
Implementation Method 1
the process of producing a beverage using the coffee bean, typically requires four basic steps be performed: (i) the raw coffee beans are roasted; (ii) the roasted coffee beans are ground; (iii) the ground coffee beans are brewed, i.e., mixed with hot water for a period of time
Implementation Method 2
the ground coffee beans are brewed, i.e., mixed with hot water for a period of time
Implementation Method 3
a lower piston assembly that slidably engages a bottom end of the cylindrical aperture, and an upper piston assembly that is configured to slidably engage the upper end of the cylindrical aperture
Implementation Method 4
A first actuator is operable to move the lower piston assembly longitudinally through the cylindrical aperture, and a second actuator is operable to move the upper piston assembly between a load position and a brewing position
Data Source
AI summary
A brewing system (100) includes a brew group (130) having a cylindrical brewing chamber (132), a first actuator (146) attached to an upper piston assembly (140) that is movable to sealingly engage one end of the brewing chamber, a second actuator (156) attached to a lower piston assembly (150) that slidably engages the opposite end of the brewing chamber. The lower piston assembly includes a water supply tube (151) that engages a channel through the piston to supply heated water to the brewing chamber. The upper piston assembly includes a dispensing tube (141) that engages a channel through the piston to accommodate dispensing the brewed liquid. A sliding arm assembly is positioned to remove spent grounds from the brewing assembly. The current embodiment includes a controller (100), hopper (112), water heater (11) and grinder assembly (120). An optional flavoring dispenser may also be provided.