Coffee Brewing Device with Mechanical Clutch for Compression Control
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Solution Overview
Problem
Existing brewing devices for coffee machines face challenges in precisely adjusting the compression force of ground coffee, leading to inconsistent coffee quality and requiring complex sensors and software for torque control, which complicates user adjustment and increases costs.
Innovation Solution
A brewing device with a simple clutch mechanism between the drive device and brewing pot, which decouples the adjustment movement from the rotary movement when a predefined torque is reached, allowing the drive device to continue running without increasing compression pressure, using a slip clutch with a ring, plate spring, and balls to automatically limit torque without additional cabling or control software.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If torque control is implemented using torque sensors or complex power management, then compression pressure control is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex electronic torque control systems (sensors, software, power management) with a simple mechanical torque limiting mechanism. The mechanical limiter directly restricts the maximum torque transmitted from the drive device to the brewing pot, eliminating the need for electronic sensors and control algorithms while achieving precise compression pressure control.
Solution Approach 2:
The mechanical torque limiter is designed as a simple, inexpensive component that can be easily replaced or adjusted. Rather than investing in expensive electronic control systems, the patent uses a cost-effective mechanical solution that maintains precision without requiring complex electronics or software.
2Manufacturing precision
If torque sensors are used for torque limitation, then compression pressure control is improved, but ease of operation deteriorates
Solution Approach 1:
The mechanical torque limiter is designed to automatically limit torque without requiring user intervention for calibration or adjustment. The mechanism self-regulates the compression pressure by mechanically blocking torque transmission when the predefined limit is reached, making the system easy to operate while maintaining precise control.
3Ease of operation
If the brewing device is made removable for hygiene, then ease of operation is improved, but reliability deteriorates
Solution Approach 1:
The patent divides the brewing device into separable components (brewing chamber, brewing pot, and base unit) that can be easily removed and reattached. The mechanical torque limiter is designed to maintain reliable torque transmission across this interface, ensuring that removability for hygiene purposes does not compromise the reliability of the torque limitation function.
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 solution allows for easy user-adjustable torque control, reduces the complexity and cost of torque limitation, and enhances user-friendliness and hygiene by eliminating the need for complex sensors and software, while ensuring precise compression for high-quality coffee production.
Implementation Method 1
The plate spring (12) is arranged between the drive shaft (8) and the ring (11) and prestresses the ring (11) against the spindle (10) via the balls (13)
Implementation Method 2
the clutch has a ring (11), a plate spring (12) and balls (13), the plate spring (12) being arranged between the drive shaft (8) and the ring (11)
Implementation Method 3
which opens when a predefined torque occurs and thereby decouples an adjustment movement of the brewing pot (6) from a rotary movement of the drive shaft (8)
Data Source
Figure 1
AI summary
The invention relates to a brewing device (1), in particular for a coffee machine (2) for preparing coffee beverages, with a brewing chamber (3) for receiving ground coffee (4), bounded by a brewing plunger (5) and an adjustable brewing pot (6), wherein the ground coffee (4) arranged in the brewing chamber can be compressed by a relative movement between the brewing pot (6) and the brewing plunger (5). A key feature of the invention is that a drive device (7) for adjusting the brewing pot (6) relative to the brewing plunger (5) is provided, and that a coupling (9) is arranged between a drive shaft (8) of the drive device (7) and the brewing pot (6), which opens when a predefined torque occurs and decouples an adjustment movement of the brewing pot (6) from a rotational movement of the drive shaft (8). This allows for a structurally simple and cost-effective compression limitation of the ground coffee (4) in the brewing chamber (3).