Razor Handle-Engaging Segment Elastic Cantilever Fastening
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Solution Overview
Problem
Disposable razors with eco-friendly handles and replaceable head units face challenges in assembly and stability due to the lack of a fastening structure, leading to inadequate fixing force and potential jolting during use.
Innovation Solution
A razor design featuring a handle with an internal space and a head unit with a cantilever section that is elastically deformable, allowing secure insertion and providing multiple points of contact for enhanced stability and fastening force, utilizing materials like wood or paper for the handle and synthetic resin for the handle-engaging segment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple hollow column shape is used for the eco-friendly handle to facilitate manufacturing from biodegradable materials, then ease of manufacture is improved, but fastening force and assembly stability deteriorate due to lack of fastening structure
Solution Approach 1:
The handle-engaging segment is divided into multiple functional sections: a insertion portion with cantilever sections for elastic deformation and engagement, a cartridge-engaging section for blade cartridge attachment, and a bridge portion connecting them. This segmentation allows each section to perform its specific function optimally while maintaining overall structural integrity without requiring complex fastening structures in the handle itself.
Solution Approach 2:
The handle-engaging segment acts as an intermediary component between the simple hollow column handle and the razor cartridge. It translates the insertion motion into secure engagement through its cantilever sections that elastically deform during insertion and then lock into place, providing the necessary fastening force without modifying the handle structure.
2Device complexity
If no fastening structure is provided in the handle to maintain simplicity and ease of assembly, then device complexity is reduced, but stability during shaving deteriorates due to handle jolting
Solution Approach 1:
The cantilever sections of the handle-engaging segment are designed to be elastically deformable during insertion, allowing dynamic adjustment to accommodate slight variations in handle internal dimensions. After insertion, the elastic deformation locks the segment in place, providing stable engagement without requiring active control mechanisms or complex fastening structures.
Solution Approach 2:
The cantilever sections utilize elastic deformation as a key parameter to achieve engagement. The sections deform elastically during insertion to overcome friction and clearance, then return to their original shape to lock into the handle, creating a secure fit. This parameter change approach provides stability without adding structural complexity to the handle.
3Ease of operation
If the head unit and handle are made incapable of being recoupled for simplicity in disposable design, then ease of operation is improved, but environmental impact worsens due to increased waste from handle disposal
Solution Approach 1:
The razor is segmented into three distinct components: a reusable handle, a replaceable head unit, and a razor cartridge. The handle and head unit are designed with complementary engagement features that allow them to be coupled and decoupled multiple times. This segmentation enables users to retain and reuse the handle while replacing only the head unit when the blade needs replacement, reducing waste.
Solution Approach 2:
The design implements a discard-and-recover strategy where the head unit (with disposable blade) is discarded after use, while the handle is recovered and reused. The handle-engaging segment is designed with features that allow easy detachment and reattachment of the head unit, facilitating the recovery and continued use of the handle component.
4Strength
If a cantilever section with elastic deformation is added to the handle-engaging segment to provide fastening force, then fastening force is improved, but device complexity increases
Solution Approach 1:
The cantilever sections are merged with the handle-engaging segment as an integral component rather than a separate mechanism. The elastic deformation feature is incorporated directly into the geometry of the handle-engaging segment, combining the fastening function with the engagement structure. This merging approach provides strong fastening force without adding separate complex mechanisms.
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 design ensures easy assembly and stable shaving performance by providing a significant increase in fastening force, preventing the handle from jolting during use, with a measured fastening force 23 times greater than the average force applied during a typical stroke.
Implementation Method 1
configured to be at least partially elastically deformable such that a diameter of the first cantilever section along a length of the first cantilever section decreases toward a free end of the first cantilever section contacting the inner circumferential surface initially and being squeezed toward a longitudinal central axis of the handle-engaging segment when the first cantilever section is inserted into the internal space
Data Source
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AI summary
A razor includes a razor cartridge including at least one shaving blade, a handle having an internal space, and a head unit. The head unit includes a cartridge-engaging segment configured to be coupled to the razor cartridge, and a handle-engaging segment having at least a portion configured to be inserted into the internal space and including a first cantilever section that is configured: to be inserted into the internal space by contacting at least a portion of an inner circumferential surface of the internal space, and to be at least partially elastically deformable such that a diameter of the first cantilever section along a length of the first cantilever section decreases toward a free end of the first cantilever section contacting the inner circumferential surface initially and being squeezed toward a longitudinal central axis of the handle-engaging segment when the first cantilever section is inserted into the internal space.