Bent Shaving Carrier Elements for Stubble Escape
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Solution Overview
Problem
Existing rotary shaving devices face inefficiencies due to hair lifting elements being disabled by cut-off hair stubble and a need for a lightweight construction, leading to less close shaves and decreased effectiveness.
Innovation Solution
A carrier with a pair of cutting and hair lifting elements, where at least one element has a bent shape with two bending lines across its width, creating a distance between their edge portions to allow escape of cut-off hair stubbles without adding weight, enabling effective hair lifting and cutting close to the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hair lifting elements are positioned close to cutting elements to enable effective hair lifting, then shaving effectiveness is improved, but cut-off hair stubble blocks the hair lifting elements causing them to become disabled
Solution Approach 1:
The patent introduces a spatial dimension solution by providing at least one bending line that extends across the width of the hair lifting element. This bending line creates a vertical/dimensional separation that positions the edge portion of the hair lifting element at a distance from the cutting element, allowing cut-off hair stubble to escape in the space between elements while the hair lifting action remains effective.
2Reliability
If additional elements are added to prevent stubble blocking, then reliability is improved, but device complexity and weight increase
Solution Approach 1:
The patent segments the hair lifting element into distinct functional portions by introducing bending lines across its width. This segmentation creates separate regions: a first portion for hair lifting engagement and a second portion positioned away from the cutting element to prevent stubble blocking. The element remains structurally unified while functioning as segmented zones.
Solution Approach 2:
The patent applies curvature through bending lines that create bent or curved configurations in the hair lifting element. This curvature allows the element to navigate around the cutting element while maintaining functional distance, enabling stubble escape paths without requiring additional straight structural components.
3Force
If hair lifting elements are made heavier for stronger hair engagement, then hair lifting effectiveness is improved, but the elements cut through hairs instead of lifting them
Solution Approach 1:
The patent changes the geometric parameters of the hair lifting element by introducing bending lines that extend across its width. This parameter change creates a spatial configuration where the edge portion is positioned at a distance from the cutting element, allowing the element to engage and lift hairs without the excessive force that would cause cutting. The bending geometry distributes and modulates the engagement force.
Data Source
AI summary
A carrier is adapted for use in a shaving device and includes at least one pair (15) of a cutting element (8) and a hair lifting element (14). At least one of the elements (8, 14) of the pair (15) has a bent shape, wherein the bent element (8, 14) is provided with at least two bending lines (17, 18). The bent shape of the at least one of the elements (8, 14) is such that in a functional arrangement of the elements (8, 14) with respect to each other, edge portions (11, 16) of the elements (8, 14) are located at a distance with respect to each other. Thus, a space (22) is present between the elements (8, 14) at the side of their edge portions (11, 16), which can be used for receiving cut-off hair stubbles which might otherwise hinder a movement of the hair lifting element (14).