Elastomeric Seal and Vibration Coupling in Oral Care Implement
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Solution Overview
Problem
Existing oral care implements, such as electric toothbrushes, face challenges in maintaining a secure seal between the replacement head and handle to prevent water damage, improving vibration transmission, simplifying manufacturing, and enhancing aesthetic design to increase sales.
Innovation Solution
The design includes a handle with a gripping portion and a stem, where the replacement head is detachably coupled using a sleeve portion with an elastomeric proximal edge and an annular rib, providing a secure seal and improved vibration transmission, while the manufacturing method involves embedding a guide pin within the stem for secure assembly and using a resilient material for the replacement head to enhance aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secure seal between replacement head and handle is implemented, then water damage protection is improved, but device complexity increases
Solution Approach 1:
The patent employs an elastomeric seal member that forms a flexible sealing interface between the replacement head and handle. This elastomeric material deforms to create a water-tight seal without requiring complex gasket systems or multiple sealing layers, thus improving water damage protection while maintaining relatively simple device structure.
Solution Approach 2:
The seal interface combines rigid structural components (handle and replacement head bodies) with elastomeric sealing material. This composite approach allows the rigid parts to provide structural integrity while the elastomeric portion provides the sealing function, achieving effective water protection through material differentiation rather than complex structural design.
2Reliability
If vibration transmission from vibratory element to cleaning elements is improved, then cleaning performance is enhanced, but device complexity increases
Solution Approach 1:
The patent integrates the vibratory element, drive shaft, and cleaning element holder into a unified assembly where the drive shaft directly couples the vibratory element to the cleaning elements. This merging eliminates intermediate coupling mechanisms and reduces vibration transmission path complexity while maintaining effective vibration transfer for cleaning performance.
Solution Approach 2:
The patent employs an eccentric cam mechanism with curved surfaces that convert rotational motor motion into vibratory motion. The curved geometry of the eccentric cam allows efficient transformation of rotational to vibrational energy, improving vibration transmission effectiveness without requiring complex mechanical linkages.
3Productivity
If manufacturing process is automated and simplified, then productivity increases, but manufacturing precision may deteriorate
Solution Approach 1:
The patent divides the oral care device into modular segments (handle, replacement head, vibratory element assembly) that can be manufactured separately through automated processes and then assembled. This segmentation enables each component to be optimized for automated manufacturing while assembly features ensure precise recombination, maintaining precision despite automation.
Solution Approach 2:
The patent incorporates pre-formed sealing surfaces and alignment features during the manufacturing of individual components. These preliminary actions ensure that when components are assembled through automated processes, the precision requirements are already built into the component geometries, allowing automated assembly to achieve adequate precision without complex control systems.
4Ease of manufacture
If aesthetic design is improved, then marketability increases, but manufacturing complexity increases
Solution Approach 1:
The patent designs the handle and replacement head components to serve multiple functions: structural support, sealing, vibration transmission, and aesthetic appearance. By making components multi-functional, the patent achieves aesthetic design goals without adding separate dedicated aesthetic elements that would increase manufacturing complexity.
Solution Approach 2:
The patent utilizes color variations and surface finish differences between components (handle, replacement head, seal member) to create aesthetic appeal. These cosmetic variations can be achieved through standard molding and finishing processes without adding structural complexity, allowing aesthetic design improvement with minimal impact on manufacturing complexity.
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
This design enhances the seal between the handle and replacement head, improves vibration efficiency, simplifies manufacturing, and increases the aesthetic appeal of oral care implements, leading to better performance and marketability.
Implementation Method 1
The replacement head may have a sleeve portion terminating in a proximal edge that is formed from a resilient material. The replacement head may be detachably coupled to the handle so that the annular rib of the shoulder and the proximal edge of the sleeve portion that is formed of elastomeric material are in contact with one another.
Data Source
AI summary
An oral care implement including a handle and a replacement head that is detachably coupled to the handle. The oral care implement may include a handle having a longitudinal axis that includes a gripping portion and a stem extending from the gripping portion. The gripping portion may have a shoulder that circumferentially surrounds the stem and an annular rib protruding from the shoulder. The replacement head may have a sleeve portion terminating in a proximal edge that is formed from a resilient material. The replacement head may be detachably coupled to the handle so that the annular rib of the shoulder and the proximal edge of the sleeve portion that is formed of elastomeric material are in contact with one another.