Filtering Press Seal and Venting for Coffee and Tea Extraction
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Solution Overview
Problem
Existing coffee and tea presses lack an efficient mechanism to separate liquid from grounds while minimizing leakage and air pressure issues, which complicates the extraction process.
Innovation Solution
A coffee or tea filtering press with a hollow cylinder, removable perforated cap, and piston that forces liquid through the cap, along with a support to hold the press over a vessel, allowing air to escape and incorporating a flexible seal and multiple drain holes to prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional filtering press is used, then liquid can be separated from grounds, but leakage occurs between the cylinder and cap
Solution Approach 1:
A flexible membrane is positioned between the cylinder and cap to create a seal that prevents leakage while allowing for pressure differential during extraction. The membrane flexes to accommodate pressure changes while maintaining the seal integrity.
Solution Approach 2:
Different regions of the press have different properties: the membrane area provides sealing, the cap provides filtration, and the cylinder provides containment. Each component is optimized for its specific function to prevent leakage while maintaining separation efficiency.
2Object-generated harmful factors
If a tight seal is created between cylinder and cap, then leakage is prevented, but air pressure builds up causing extraction problems
Solution Approach 1:
The flexible membrane acts as a pressure-regulating seal that can flex to accommodate air pressure changes during extraction, preventing dangerous pressure buildup while maintaining leakage prevention. The membrane's elasticity allows it to deform under pressure rather than creating a rigid seal.
Solution Approach 2:
The seal system transitions from a static rigid seal to a dynamic flexible membrane that can adapt its shape and tension based on the pressure conditions during extraction, balancing leakage prevention with pressure management.
3Ease of manufacture
If the press structure is simplified, then manufacturing is easier, but air cannot escape from the vessel
Solution Approach 1:
The flexible membrane serves multiple functions simultaneously: it seals the interface between cylinder and cap, allows air pressure to equalize during extraction, and maintains structural simplicity. This eliminates the need for complex air venting mechanisms.
Solution Approach 2:
The membrane component performs multiple functions: sealing, pressure equalization, and structural support. This multi-functionality simplifies the overall press structure by eliminating the need for separate components for each function.
4Reliability
If a removable cap with filter is used, then particle separation is improved, but the structure becomes more complex
Solution Approach 1:
The flexible membrane integrated into the cap structure provides both sealing and filtration functions. The membrane's porous structure allows it to act as a filter while its flexibility provides the sealing function, reducing overall structural complexity.
Solution Approach 2:
The sealing function and filtration function are merged into a single membrane component rather than requiring separate seal and filter elements. This integration simplifies the cap structure while maintaining both particle separation and sealing effectiveness.
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 design effectively separates liquid from grounds, minimizes leakage, and facilitates easy ejection of the spent puck, enhancing the brewing process by utilizing pressurized air to force liquid through the filter efficiently.
Implementation Method 1
a removable piston which is inserted into the top opening and pressed downward to force liquid in the cylinder through the perforated cap
Implementation Method 2
The piston may be capped with a flexible seal to engage the inside of said hollow cylinder
Implementation Method 3
The support is shaped to permit air to pass readily out of the open vessel when said press is resting on top of the vessel
Data Source
AI summary
A coffee or tea filtering press includes a hollow cylinder having top and bottom openings, a perforated removable cap which encloses the bottom opening, a removable piston which is inserted into said top opening and pressed downward to force liquid in the cylinder through the perforated cap, and a support to hold the press above the mouth of an open vessel.