Rotary Electric Shaver with Interchangeable Reciprocating Head
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Solution Overview
Problem
Rotary electric shavers cause a tingling feel due to thicker outer blades, while reciprocating shavers are better for deep hair shaving but have different drive systems and speeds, making it difficult to combine both functions without increasing weight, size, and cost.
Innovation Solution
A rotary electric shaver design with a dual-head system, where one main body houses a rotary head with a gear-driven transmission and a detachable reciprocating head with an eccentric shaft and oscillators, allowing the shaver to operate as both a rotary and reciprocating shaver, maintaining size and minimizing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rotary electric shaver uses a thicker outer blade to reduce skin tingling, then skin comfort is improved, but deep hair shaving capability deteriorates
Solution Approach 1:
The patent applies dynamics by making the outer blade thickness adjustable rather than fixed. The outer blade can be replaced or adjusted to change its thickness, allowing the shaver to adapt between different blade thicknesses for different shaving needs - thinner blades for deep hair removal and thicker blades for skin comfort during regular use.
2Adaptability or versatility
If both rotary and reciprocating electric shaver functions are combined in one device, then versatility is improved, but weight and size increase
Solution Approach 1:
The patent implements universality by designing a main body that can accommodate both rotary and reciprocating heads through a universal mounting interface. The drive shaft can drive both types of heads, and the main body structure supports both operating modes, allowing one device to perform multiple shaving functions without requiring separate devices for each head type.
Solution Approach 2:
The patent applies segmentation by separating the head units from the main body, allowing the heads to be detached and interchanged independently. This modular design enables the user to switch between rotary and reciprocating functions by simply changing the head attachment, rather than integrating both mechanisms into a single bulky unit.
3Device complexity
If a reciprocating electric shaver head is driven by a rotary electric shaver's drive shaft, then device complexity is reduced, but rotation speed is insufficient for effective hair cutting
Solution Approach 1:
The patent applies dynamics by implementing a variable speed drive system or multiple drive modes. The drive shaft can operate at different rotation speeds depending on the attached head type - lower speeds for rotary heads and higher speeds for reciprocating heads. This may involve variable frequency motor control or mechanical speed variation mechanisms to provide appropriate speed for each head type.
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
Enables both reduced skin tingling and deep hair shaving capabilities without increasing weight or size, ensuring satisfactory usability and cost-effectiveness by using a single main body with interchangeable heads.
Implementation Method 1
The second transmission drive system has an eccentric shaft and a plurality of oscillators that convert a rotational motion of the eccentric shaft into a reciprocating motion
Data Source
AI summary
A rotary electric shaver has a new structure which compatibly achieves both a function of the rotary electric shaver allowing a user to have less tingling feel on the skin and a function of a reciprocating electric shaver enabling easy deep shaving of hair, by replacing a first head. A rotary electric shaver includes a main body having a drive shaft and a connection part, a first head having a built-in first transmission drive system connected to the drive shaft to rotate a first inner blade, and detachably connected to the connection part, and a second head detachably connected to the connection part from which the first head is removed. The second head has a built-in second transmission drive system connected to the drive shaft to cause the second inner blade to reciprocate.