Toothbrush Refill Head Cam-Follower Mechanism
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Solution Overview
Problem
Existing powered toothbrushes with refill heads can only produce either vibratory or rotary motion, failing to provide both types of motion necessary for comprehensive oral care.
Innovation Solution
A powered toothbrush design featuring a refill head that can be detachably coupled to a handle, utilizing a cam-follower assembly and drive shafts to generate both vibratory and oscillatory motion through an electric motor, allowing for the transmission of multiple types of motion to the tooth cleaning elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a refill head is designed to produce only one type of movement (vibratory or rotary), then the device complexity is reduced, but the adaptability and versatility of the toothbrush are limited
Solution Approach 1:
The patent combines both vibratory and rotary motion mechanisms within a single refill head assembly. The cam-follower mechanism generates vibratory motion while simultaneously engaging with drive shafts to produce rotary motion, allowing the cleaning elements to receive both types of movement through integrated mechanical pathways.
Solution Approach 2:
The refill head is designed as a multi-functional component that can produce multiple types of motion (vibratory and rotary) simultaneously. The cam-follower assembly serves dual purposes by both vibrating the cleaning elements and driving the rotary motion through the drive shafts, making the single refill head capable of performing multiple cleaning functions.
2Productivity
If the handle includes expensive motion-inducing circuitry and components, then the productivity and cleaning effectiveness are improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the motion-inducing mechanical components (cam-follower assembly, drive shafts, gears) from the handle and relocates them to the refill head. This allows the handle to contain only the simple electric motor and battery, while the complex mechanical motion-generating components are housed in the replaceable refill head, reducing handle manufacturing cost.
Solution Approach 2:
The refill head containing the mechanical motion-inducing components is designed as a disposable or replaceable component with a limited lifespan. When the mechanical components wear out or the bristles wear down, the entire refill head is replaced rather than repairing the expensive handle, effectively transferring the cost burden to the inexpensive replaceable component.
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 effective cleaning and polishing by providing both vibratory and rotational movements to the tooth cleaning elements, enhancing the oral care experience while allowing for the longevity of the handle and replaceability of the refill head.
Implementation Method 1
a cam-follower assembly and drive shafts to generate both vibratory and oscillatory motion
Implementation Method 2
utilizing a cam-follower assembly and drive shafts to generate both vibratory and oscillatory motion through an electric motor
Data Source
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AI summary
A refill head, and a powered toothbrush including the same, wherein the refill head comprises a head portion including a movable tuft block that is rotated via operable coupling to a primary drive shaft of the handle. The head portion of the refill head is also receives vibrations from an eccentric that is operated by the primary drive shaft.