One-Piece Plastic Spring Device for Magnetic Shaver Drive
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Solution Overview
Problem
Existing electric shavers with magnetic linear drive units face challenges in achieving efficient transmission of oscillations with large amplitudes and stable frequencies while maintaining a simple structure for easy manufacturing and mounting, often resulting in vibrations being felt during use due to mismatched dynamic effects and restricted oscillating amplitudes.
Innovation Solution
A spring device comprising a one-piece plastic ring element with leaf springs and cross-bars, which forms a resonance spring to connect drive components, allowing for natural frequency oscillation and precise control of oscillations, while also providing a rigid connection without complex structures, and a second spring device made from metal for suspension to reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a magnetic linear drive unit with reciprocating drive components is used, then oscillating motion can be generated for personal care appliances, but vibrations are felt during use due to mismatched dynamic effects
Solution Approach 1:
The patent applies the counterweight principle by having two drive components (permanent magnet and magnetic coil) that reciprocate in opposite directions with matched dynamic effects. This creates balanced oscillating motion where the movement of one component counteracts the movement of the other, eliminating net vibrations and reducing harmful effects during operation.
2Ease of operation
If plastic spring devices including leaf springs or c-shaped springs are used to connect drive components, then the structure allows for linear oscillation, but the structure becomes complex and manufacturing becomes difficult
Solution Approach 1:
The patent merges multiple spring elements (leaf springs and cross-bars) into a single integrated plastic component. This unified spring device maintains all necessary oscillation capabilities while eliminating the complexity of assembling multiple separate parts, thereby simplifying manufacturing and reducing assembly steps.
3Stability of the object's composition
If drive components are rigidly connected to mounting structure, then stable support is provided, but oscillating amplitudes are restricted
Solution Approach 1:
The patent transitions from rigid connections to dynamic spring-based connections between drive components and mounting structure. The plastic spring device provides flexible, elastic coupling that allows large oscillating amplitudes while maintaining stable mounting through the spring's restoring force, enabling both stability and freedom of motion.
4Ease of operation
If multiple separate spring elements are used to connect drive components, then oscillation support is provided, but device complexity increases
Solution Approach 1:
The patent combines multiple spring elements (leaf springs and cross-bars) into a single integrated plastic component. This unified spring device maintains all necessary oscillation capabilities while eliminating the complexity of assembling multiple separate parts, thereby simplifying the overall device structure and reducing component count.
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 enables efficient transmission of oscillations with high amplitudes and stable frequencies, reducing vibrations and simplifying the mounting process, while maintaining a robust and easy-to-manufacture design.
Implementation Method 1
another one of the drive components may include one or more magnetic coils to which pulsating electric current is applied to create pulsating magnetic fields, thereby causing the two drive components to oscillate relative to each other
Implementation Method 2
first and second drive components connected to each other by means of a spring device for linear displacement relative to each other
Data Source
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AI summary
The present invention relates to electric appliances for personal care, in particular electric shavers, comprising a magnetic linear drive unit having first and second drive components supported for linear displacement relative to each other by a spring device and adapted to magnetically interact with each other. Said spring device includes a ring element made in one piece from plastic including at least one pair of leaf springs and a pair of cross-bars extending crosswise to said leaf springs and connecting said leaf springs to each other.