Reciprocating Shaving Razor Blade Mechanism
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Solution Overview
Problem
Conventional shaving razors, whether electric or exposed-blade, face limitations in achieving a close shave due to design constraints, with electric razors being bulky and less effective in tight spaces, and exposed-blade razors experiencing blade dullness issues leading to premature cartridge replacement.
Innovation Solution
A shaving razor design featuring a disposable shaving head with a reciprocating blade mechanism, where a magnetic mass is driven by a magnetic actuator to oscillate, reducing blade dullness and increasing the cartridge's useful life by employing a sawing effect for hair cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional exposed-blade razors with stationary blades are used, then the structure is simple and easy to manufacture, but the blade dulls quickly requiring frequent cartridge replacement
Solution Approach 1:
The patent applies the dynamics principle by transforming the stationary blade into a reciprocating blade that moves back and forth during shaving. The blade is connected to a drive mechanism (magnetic actuator or mechanical cam) that imparts reciprocating motion, allowing the blade to saw through hair rather than simply cutting it. This dynamic motion reduces blade dullness and extends cartridge life while accepting increased mechanism complexity.
Solution Approach 2:
The patent employs mechanical vibration by using a magnetic actuator with an eccentric mass that generates oscillating motion. When powered, the magnetic actuator causes the blade to vibrate and reciprocate rapidly, creating a sawing effect that cuts hair more efficiently and reduces blade wear. The vibration frequency and amplitude are controlled to optimize cutting performance while extending blade life.
2Duration of action of moving object
If electric razors with protective screens are used, then the device can be used for many shaves without replacement, but the device becomes bulky and cannot access tight spaces
Solution Approach 1:
The patent applies the disposable principle by designing a razor system where the cartridge (containing the reciprocating blade mechanism) is intended to be replaced after a extended period of use (up to a year). The disposable cartridge includes the magnetic actuator, blade, and housing as an integrated unit that can be easily replaced by the user, providing long-term value while maintaining a compact form factor.
Solution Approach 2:
The patent extracts the reciprocating blade mechanism into a separate, self-contained cartridge that can be independently replaced. The magnetic actuator, blade, and associated components are packaged together in a modular cartridge that attaches to a reusable handle, allowing users to replace only the consumable portion rather than the entire device.
3Productivity
If multiple stationary blades are aligned in the same direction, then more hair can be cut simultaneously, but the leading blade dulls more quickly requiring premature replacement
Solution Approach 1:
The patent applies dynamics by making the leading blade reciprocate while other blades remain stationary or reciprocate with different amplitudes. This creates a sawing action at the leading edge that reduces dulling, while trailing blades provide additional cutting support. The differential motion allows multiple blades to work together without the leading blade bearing the full burden of cutting.
Solution Approach 2:
The patent applies local quality by giving different blades different functions and motions. The leading blade receives reciprocating motion for primary cutting, while trailing blades may have reduced motion or different phase angles. Each blade is optimized for its specific position in the shaving sequence, with varying reciprocation amplitudes and phases to distribute wear and maximize overall cutting efficiency.
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 reciprocating blade mechanism enhances cutting efficiency, reducing blade dullness and pulling/tugging, allowing the cartridge to last up to a year without replacement and providing a closer shave with reduced risk of nicks and cuts.
Implementation Method 1
a magnetic mass is driven by a magnetic actuator to oscillate
Implementation Method 2
magnetic actuator to oscillate
Implementation Method 3
employing a sawing effect for hair cutting
Data Source
AI summary
A shaving razor having a handle and a shaving head with an exposed reciprocating blade. A power source is disposed within the handle with an actuator that causes at least one blade of a multi-blade razor head to reciprocate within a zone of motion. Other embodiments are also described and claimed.