Razor Blade Heating System with Spaced Conductors
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Solution Overview
Problem
Existing electric razors fail to maintain blades warm throughout the shaving process due to rapid temperature reduction from ambient air, leading to inefficiencies in hair cutting and increased shaving cream usage.
Innovation Solution
A blade cartridge system with two spaced wire conductors connected to the back edges of parallel blades for efficient heat distribution, utilizing a thin conductive film and staples with insulation to enhance conductivity and control heat through a radiator effect, allowing for intuitive temperature adjustment based on skin contact and air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single heating element is used in the blade cartridge, then the device complexity is reduced, but the heat distribution uniformity across the blades is insufficient
Solution Approach 1:
The heating system is segmented into multiple independent heating elements, with each blade having its own heating element. This segmentation allows each element to independently heat its corresponding blade, ensuring uniform heat distribution across all blades while maintaining a relatively simple overall structure.
Solution Approach 2:
Each blade is equipped with a dedicated heating element positioned at its rear end, providing localized heating tailored to each blade's specific thermal needs. This local quality approach ensures that heat is distributed uniformly across each individual blade, addressing the uniformity issue without requiring a complex centralized system.
2Temperature
If continuous heating is applied to maintain blade temperature, then the temperature stability is improved, but the battery power consumption increases
Solution Approach 1:
The heating elements are activated periodically rather than continuously. The control system monitors blade temperature and cycles the heating elements on and off as needed, maintaining optimal blade temperature while significantly reducing battery power consumption compared to continuous heating.
Solution Approach 2:
The system utilizes the natural heat retention properties of the blade cartridge structure and the thermal mass of the blades themselves to maintain temperature between heating cycles. The design allows the blades to retain heat effectively, reducing the frequency and duration of heating cycles needed, thereby lowering power consumption while maintaining temperature stability.
3Temperature
If the blade cartridge is fully enclosed to retain heat, then the temperature maintenance is improved, but the air flow circulation is restricted
Solution Approach 1:
The blade cartridge features selective enclosure with strategic openings positioned to minimize heat loss while maintaining effective heat retention. The rear ends of the blades are enclosed to trap heat around the heating elements and blades, while controlled openings allow necessary air circulation to prevent excessive heat buildup and enable heat dissipation when blades are removed from skin.
Solution Approach 2:
The system incorporates temperature sensing that provides feedback to the heating control, adjusting heating intensity and duration based on actual blade temperature and usage conditions. This feedback mechanism optimizes the balance between heat retention and air flow, reducing energy loss while maintaining optimal blade temperature for shaving performance.
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 solution provides uniform heat distribution across the blades, reducing shaving cream requirements and enabling efficient battery power usage while allowing for intuitive control of blade temperature, maintaining optimal warmth during shaving.
Implementation Method 1
two wire conductors of an electric circuit connected to the blades at spaced intervals to provide an electric current flow through the blades
Implementation Method 2
A radiator effect of the heated blades causes the blades to become warmer when the blades are positioned against the user's skin and air flow between the blades is blocked
Data Source
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AI summary
A blade cartridge for a shaving razor contains a series of parallel blades, and at least two wire conductors of an electric circuit connected to the blades at spaced intervals to provide an electric current flow through the blades in a manner that provides more efficient heat distribution across the length of the blades. The ends of the blades may be held in place by staples that are insulated from the electric circuit. A thin conductive film may be fitted to be in contact with the ends of the blades to insure conductivity throughout the entire length of each blade. A radiator effect of the heated blades causes the blades to become warmer when the blades are placed against the skin surface and air is unable to circulate between the blades. The blades become less hot when removed from the skin and air circulates between the blades.