Shaving Apparatus Coupling with Convergent Recesses
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Solution Overview
Problem
Existing shaving apparatuses face challenges in maintenance and cleaning, particularly in ensuring proper alignment and secure mounting of the cutting units after cleaning, which can lead to misalignment and malfunction due to hair accumulation and complex geometries.
Innovation Solution
The internal cutting member features a coupling member with convergent recesses and chamfered edges that guide the coupling head into the coupling cavity, facilitating easy assembly and preventing misalignment, while through-holes allow hair escape, enhancing maintenance and cleaning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the coupling head is inserted into the coupling cavity after cleaning, then the cutting unit can be reassembled, but misalignment and malfunction may occur due to complex geometries and hair accumulation
Solution Approach 1:
The coupling cavity is provided with guiding surfaces that preliminarily guide the coupling head into the correct position before final engagement. This preliminary guidance action ensures proper alignment is established before the components are fully assembled, preventing misalignment issues during reassembly after cleaning.
Solution Approach 2:
The patent introduces an intermediary guiding structure (guiding surfaces and geometry) between the coupling head and coupling cavity that mediates the assembly process. This intermediary element facilitates smooth alignment and engagement, preventing direct misalignment that would otherwise occur due to complex geometries or hair accumulation.
2Reliability
If the coupling geometry is complex to ensure secure mounting, then mounting reliability improves, but alignment precision deteriorates due to difficulty in proper positioning
Solution Approach 1:
The coupling interface is segmented into distinct functional zones: guiding surfaces for alignment, engagement surfaces for secure mounting, and clearance zones for tolerance accommodation. This segmentation allows each zone to perform its specific function optimally, ensuring both secure mounting and precise alignment without interference from complex overall geometry.
Solution Approach 2:
The patent employs curved or conical guiding surfaces in the coupling cavity that gradually guide the coupling head into proper alignment. These curved surfaces provide smooth transition and self-centering action, ensuring precise alignment even when the overall coupling geometry is complex, by using geometric curvature to guide positioning rather than relying on flat or angular surfaces.
Data Source
AI summary
A shaving apparatus has at least one cutting unit detachably coupled to a drive mechanism via a coupling having first and second coupling members. The second coupling member has a coupling cavity. A coupling head of the first coupling member is in a form-locking engagement in the coupling cavity to transfer a driving force, and is detachable from the coupling cavity by movement in an axial direction parallel to an axis of rotation of the cutting unit. The second coupling member has a plurality of recesses, each recess extending in a radial direction from the coupling cavity and being delimited by two radially extending side wall sections. Each of the two radially extending side wall sections forms an edge with a bottom surface of the second coupling member, and the edges of each recess converge in a radially outward direction in relation to the axis of rotation.