Rotary Razor Variable Speed Drive Train and Lubricant Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric shavers lack the ability to control the speed of rotary blade modules effectively during wet shaving, which is necessary for accommodating different skin types and hair types, and they do not provide a convenient means for administering shaving aids during the shaving process.
Innovation Solution
A wet shaving device with a motor positioned away from the rotary blade module, allowing for variable speed control through an actuator and a drive train assembly with multiple shafts that transfer rotational movement, and incorporating a lubricant delivery system within the rotary blade module to provide shaving aid during shaving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor is positioned within the rotary cutter to achieve compact construction, then the device complexity is reduced, but the weight distribution and profile become inferior
Solution Approach 1:
The device is divided into separate functional modules: the motor is positioned in the handle while the rotary blade module is separate, connected through a drive train assembly. This segmentation allows each component to be optimized independently, achieving both compact construction and slim profile.
Solution Approach 2:
The motor rotates about a first axis while the rotary blade module rotates about a third axis substantially perpendicular to the first axis. This dimensional change in rotation axes enables the motor to be positioned away from the rotary blade module while maintaining efficient power transmission through the drive train assembly.
2Shape
If the motor is positioned away from the rotary blade module to achieve slimmer profile, then the profile slimness is improved, but the device complexity increases
Solution Approach 1:
A drive train assembly including at least one shaft acts as an intermediary between the motor and the rotary blade module, transferring rotational movement from the motor to the rotary blade module. This intermediary mechanism enables the motor to be positioned away from the rotary blade module while maintaining a relatively simple overall structure.
3Productivity
If the rotary blade module rotates at high speed to increase shaving efficiency, then the productivity is improved, but skin irritation increases
Solution Approach 1:
The actuator is configured to vary the speed of the motor, allowing the rotary blade module to rotate at different speeds (first speed at first position, second speed at second position). This dynamic speed adjustment enables users to optimize between shaving efficiency and skin comfort based on their specific needs.
4Object-generated harmful factors
If a filament is wound around the rotary cutter to provide safety protection, then the object-generated harmful factors are reduced, but shadows are created along the shaving path
Solution Approach 1:
The patent removes the filament safety wire from the design entirely. Instead of using a filament wound around the rotary cutter, the invention relies on the inherent safety of the rotary blade module design and the lubricant delivery system to provide both safety and effective shaving coverage without creating shadows.
Data Source
AI summary
A wet shaving device comprising a motor; an actuator configured to vary the speed of the motor; a rotary blade module having at least one cutting element; and a drive train assembly including at least one shaft operatively coupling the motor and the rotary blade module, wherein the at least one shaft may be configured to transfer the rotational movement of the motor to the rotary blade module.