Coffee Grinder Bayonet Mount for Larger Hygienic Grinding Surfaces
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Solution Overview
Problem
Existing coffee grinder assemblies face issues with grinding wheel wear, reduced coffee powder quality due to particle size variation, and hygiene concerns from connecting bores that interrupt the grinding surface and are difficult to machine in hard materials.
Innovation Solution
The coffee grinder assembly employs a rotational closure mechanism with radially extending protrusions and corresponding recesses in the grinding wheels and support members, eliminating the need for connecting bores, ensuring precise axial and radial positioning, and enhancing hygiene by preventing coffee dust accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connecting bores are provided in grinding wheels to fix them in support members, then the grinding wheels can be securely fixed, but the grinding surface area is reduced and hygiene is compromised
Solution Approach 1:
The invention extracts the connecting bores from the grinding wheels entirely, replacing them with an external fixing mechanism where cam members engage with recesses in the support member to secure the grinding wheels without penetrating them, thus preserving the complete grinding surface area while maintaining fixing reliability
Solution Approach 2:
The invention introduces cam members as intermediary elements between the grinding wheels and support members. These cam members engage with recesses in the support member to provide secure fixing without requiring holes in the grinding wheels themselves, acting as a mediator that enables reliable attachment while preserving the integrity and surface area of the grinding wheels
2Reliability
If connecting bores are provided in hard grinding wheels, then the wheels can be fixed to support members, but the machining difficulty increases significantly
Solution Approach 1:
The invention removes the need to machine connecting bores in the hard grinding wheel material by using an external cam member fixing system that engages with recesses in the support member, thereby eliminating the difficult machining operation while maintaining secure fixing
Solution Approach 2:
Instead of creating holes in the grinding wheel to receive fasteners, the invention inverts the approach by having the support member provide recesses that receive cam members, which then secure the grinding wheel from the outside, reversing the traditional fastening paradigm to avoid machining hard material
3Reliability
If connecting bores are provided in grinding wheels, then the wheels can be assembled with support members, but coffee powder accumulates in bores and connecting means causing hygiene issues
Solution Approach 1:
The invention extracts the connecting bores from the grinding wheels, eliminating the cavities where coffee powder could accumulate. The cam member system engages with external recesses in the support member, leaving the grinding wheel surface smooth and free of crevices where contamination could occur
Solution Approach 2:
The invention converts the potential harm of needing secure fixation (which would require penetrating bores) into a benefit by using an external cam member system that provides reliable assembly while actually improving hygiene by eliminating internal cavities and connection points where coffee powder could accumulate
4Duration of action of stationary object
If grinding wheels are made harder to improve wear resistance, then the wheel life increases, but the difficulty of machining connecting bores increases
Solution Approach 1:
The invention extracts the machining operation from the grinding wheel manufacturing process by using an external cam member fixing system that requires no holes in the wheel itself, allowing the wheels to be made as hard as needed for wear resistance without compromising manufacturability
Solution Approach 2:
The invention inverts the traditional approach by not machining holes in the hard grinding wheel material. Instead, the support member provides recesses for cam members that secure the wheels externally, reversing the sequence and methodology to enable use of harder, more wear-resistant materials
Data Source
AI summary
A coffee grinder assembly for a coffee machine comprises two coaxially arranged grinding wheels. One of the grinding wheels is driven by an electric motor, and the other one is stationary. For receiving the grinding wheels, two grinding wheel support members are provided. Each grinding wheel is provided with radially extending protrusions, and each grinding wheel support member is provided with corresponding recesses to form a bayonet closure. By such a design, the provision of connecting bores in the grinding wheels can be avoided, resulting in an enlarged effective grinding surface.