Hand Coffee Grinder with Variable Transmission for Torque Reduction
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Solution Overview
Problem
Conventional coffee grinders produce granules of varying dimensions, leading to inconsistent extraction and flavor in espresso preparation, and require excessive torque for grinding lighter roasts, making them difficult to use, especially for hand grinders with conical burrs.
Innovation Solution
A grinding device with a variable transmission mechanism allowing users to select between 1:1 and 1:2 gear sets, reducing the required torque and ensuring even grinding, combined with a burr mechanism using conical burrs and a distribution member for homogenization within the grinding chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional coffee grinder with conical burrs is used, then the device structure is simple, but the granule size consistency deteriorates and excessive torque is required
Solution Approach 1:
The patent implements a variable transmission mechanism that allows dynamic adjustment of the gear ratio between 1:1 and 1:2. This enables the system to adapt its mechanical advantage based on grinding conditions, optimizing both torque delivery and granule consistency without requiring a completely complex device structure. The selectable gear sets provide dynamic flexibility while maintaining relative structural simplicity.
Solution Approach 2:
The patent changes the transmission ratio parameter from a fixed value to a variable one, offering two discrete settings (1:1 and 1:2 gear ratios). This parameter change allows the system to optimize performance for different bean hardness levels and grind types, improving granule size consistency while managing the torque requirement through selectable mechanical advantage.
2Ease of manufacture
If a conventional coffee grinder is used, then the device is easy to manufacture, but excessive torque is required making it difficult to operate
Solution Approach 1:
The variable transmission mechanism with selectable gear ratios provides dynamic adaptability in torque delivery. Users can switch between 1:1 and 1:2 ratios depending on bean hardness, making the device easier to operate for both hard and soft beans while maintaining a relatively simple manufacturing process using standard gear components.
Solution Approach 2:
By changing the transmission ratio parameter to be variable rather than fixed, the system optimizes ease of operation for different grinding conditions. The 1:2 gear ratio provides increased mechanical advantage for harder beans, reducing the effort required by the user, while the overall device remains easy to manufacture using conventional gear mechanisms.
3Device complexity
If a conventional coffee grinder is used, then the device structure is simple, but user effort increases for harder beans
Solution Approach 1:
The selectable variable transmission mechanism allows the system to dynamically adjust its mechanical advantage based on the hardness of the beans being ground. Users can engage the 1:2 gear ratio when grinding harder beans to reduce the required user effort, while maintaining a relatively simple device structure using standard gear components and a selection lever.
Solution Approach 2:
The transmission ratio parameter is changed from fixed to variable, enabling the system to optimize the force requirement for different bean hardness levels. The 1:2 gear ratio provides increased mechanical advantage that reduces user effort for harder beans, while the overall device structure remains simple and uses conventional mechanical components.
4Force
If a variable transmission mechanism is added, then torque requirement is reduced, but device complexity increases
Solution Approach 1:
The variable transmission mechanism is segmented into two discrete, simple gear sets (1:1 and 1:2 ratios) rather than a continuous variable transmission. This segmentation allows the system to provide torque optimization without requiring a complex continuous variable mechanism. The gear selection is achieved through a simple lever that engages one of two pre-configured gear sets, balancing torque reduction with acceptable device complexity.
Solution Approach 2:
The system implements dynamic selectability between two fixed gear ratios rather than a continuous variable transmission. This provides the benefits of adaptive torque optimization while maintaining relatively simple device complexity through the use of discrete gear sets and a straightforward selection mechanism.
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 device ensures balanced granule size for espresso, reduces user effort by adjusting torque based on bean hardness, and eliminates the need for additional homogenization steps, providing a consistent and pleasurable grinding experience for all users.
Implementation Method 1
A first set of magnets is disposed about the top of the tumbler. A burr mount is also supported by the burr collar, wherein a second set of magnets is disposed about the burr mount for attracting the first set of magnets of the tumbler.
Data Source
AI summary
A novel device for hand grinding coffee is disclosed. The device preferably includes a base, a stanchion disposed about the base, and a gear box, a burr collar, and a flywheel each extending away from the stanchion. The flywheel includes a handle for turning it. The device further includes a gear mechanism including a main driven shaft. The main driven shaft extends downward from the gear box. There also is a burr mechanism driven by the gear mechanism. The device may include a variable transmission mechanism having a first gear set and a second gear set selectively engageable to drive the main driven shaft. The device may also include a tumbler having a ground chamber. A distribution member is configured to rotate within the ground chamber of the tumbler during operation of the device.