Shaving Razor Trimming Comb Guard for Long Hair
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional shaving razors with multiple blades face challenges in cutting longer hairs effectively due to drag forces and reduced maneuverability, leading to incomplete trimming and discomfort.
Innovation Solution
A shaving razor blade unit with a housing featuring a primary guard, primary cap, and a rear-mounted trimming blade equipped with a trimming comb guard having a plurality of projections defining open slots that allow for the free passage of hair, ensuring optimal cutting of longer hairs without trapping them against the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of blades on a shaving razor is increased to improve shaving efficiency and distribute compressive forces better, then shaving efficiency is improved, but drag forces increase and maneuverability is reduced
Solution Approach 1:
The razor is segmented into two distinct functional zones: a front shaving section with multiple blades for efficient skin shaving, and a rear trimming section with a single blade and comb guard for precise hair trimming. This segmentation allows each section to perform its specialized function without the negative effects of the other, maintaining both shaving efficiency and maneuverability.
2Adaptability or versatility
If a trimming blade is added to the rear of the razor to improve trimming capability, then trimming ability is improved, but drag forces and reduced maneuverability worsen
Solution Approach 1:
The comb guard acts as an intermediary element between the trimming blade and the skin. It selectively allows short hairs to pass through to the blade while blocking longer hairs, enabling the trimming blade to function effectively without requiring direct contact with all hair types, thus improving versatility without significantly increasing drag.
3Ease of manufacture
If the trimming blade cuts longer hairs at a parallel angle to the skin surface, then cutting action is simplified, but cutting effectiveness deteriorates because the blade cannot cut hairs that lie flat on the skin
Solution Approach 1:
The comb guard serves as a mediator that lifts and positions longer hairs vertically as they pass through its slots, transforming them from a flat-lying state to an upright state. This allows the trimming blade, with its simple parallel cutting geometry, to effectively cut longer hairs that would otherwise be inaccessible, thereby improving cutting effectiveness without complicating the blade design.
Solution Approach 2:
The comb guard performs a preliminary action by lifting and orienting longer hairs to a vertical position before they reach the trimming blade. This pre-positioning of the hairs ensures that when they contact the blade, they are at the optimal angle for cutting, enabling the blade's simple parallel geometry to achieve effective cuts on longer hairs.
Data Source
AI summary
A shaving razor blade unit including a housing having a primary guard at a front of the housing and a primary cap at an upper surface at a back of the housing. One or more primary shaving blades are positioned between the primary guard and the primary cap. A trimming blade is mounted at the back of the housing and has a cutting edge. A trimming comb guard is located at the back of the housing. The trimming comb guard has a plurality of projections along a length of the trimming comb guard defining a plurality of open slots extending generally perpendicular to the cutting edge. The open slots have a minimum width of about 0.20 mm to about 0.49 mm for allowing the free passage of hair during shaving.