Elastic Connecting Rod Converts Linear Motion to Oscillation
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Solution Overview
Problem
Existing electric toothbrushes have complex internal structures, high production costs, and are prone to damage due to high-speed motor rotation, making them inflexible and inconvenient to use, with poor tooth cleaning effects.
Innovation Solution
An electric toothbrush rotating replacement head device with a simplified structure featuring an elastic connecting rod, compression spring, and interference fit rotating shaft, which converts linear motion into rotary oscillation for improved stability and reduced noise, and a copper-free bristle planting process for hygiene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-speed motor with transmission assembly is used to drive the brush head to vibrate, then the tooth cleaning effect is improved, but the device complexity increases and the reliability decreases
Solution Approach 1:
The patent extracts and removes the complex high-speed motor and transmission assembly from the toothbrush structure. Instead, it uses a simple oscillating mechanism where the brush head itself oscillates back and forth through a limited angle, eliminating the need for complex internal transmission components while maintaining effective cleaning capability.
Solution Approach 2:
Instead of using a motor to rotate and transmit motion through a transmission assembly to create vibration, the patent inverts the approach by directly oscillating the brush head through a simple hinge mechanism. The motion generation is simplified from complex rotational transmission to direct oscillating movement.
2Reliability
If a high-speed motor with transmission assembly is used to drive the brush head to vibrate, then the tooth cleaning effect is improved, but the production cost increases
Solution Approach 1:
The patent extracts and removes the expensive high-speed motor and transmission assembly components. The simplified oscillating mechanism uses fewer parts, reducing both material costs and assembly complexity, thereby lowering production costs while maintaining effective tooth cleaning function.
3Stability of the object's composition
If the brush head is firmly fixed to the handle, then the structural stability is improved, but the ease of replacement decreases
Solution Approach 1:
The patent segments the toothbrush into modular components: the handle and the brush head are separate replaceable parts. The brush head can be easily detached and replaced by users, while each component maintains its structural integrity. This modular design allows frequent replacement without compromising overall stability.
4Strength
If copper bristles are used for brushing, then the mechanical strength is improved, but the harmful effects increase due to rusting
Solution Approach 1:
The patent uses composite bristle materials that combine the mechanical strength of traditional bristles with rust-resistant properties. The bristles are designed to maintain durability and cleaning effectiveness while eliminating the rusting problem associated with copper-containing materials, thereby removing harmful pollution.
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 device offers flexible installation and disassembly, enhanced cleaning efficiency, reduced costs, and improved stability with reduced noise and rusting pollution, providing a better tooth cleaning experience.
Implementation Method 1
a compression spring disposed on the spring limiting disc, and the elastic connecting rod being disposed in the compression spring
Implementation Method 2
an elastic connecting rod disposed in the cavity, and a top of the elastic connecting rod defining a first pin hole
Data Source
AI summary
An electric toothbrush rotating replacement head device includes a toothbrush replacement head body. The toothbrush replacement head body includes a toothbrush handle and a toothbrush head, the toothbrush handle defines a cavity, the toothbrush head is disposed on a top of the cavity, an inside of the cavity is provided with an elastic connecting rod, a bottom of the elastic connecting rod is provided with a spring limiting disc, a top of the elastic connecting rod defines a first pin hole, the elastic connecting rod is disposed in a compression spring, and the compression spring is disposed on the spring limiting disc. The toothbrush head includes a convex block, the convex block defines a second pin hole, and the elastic connecting rod is inserted into the second pin hole and connected to the toothbrush head through the pin.