Toothbrush Head Coupling Structure Preventing Axial Disengagement
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Solution Overview
Problem
Existing powered toothbrush replacement heads face challenges in manufacturing complexity, improper loading, and inadequate coupling to the handle, leading to inefficiencies and potential damage during use.
Innovation Solution
A specially designed coupling structure featuring a tubular sleeve with a locking tab and protuberance that engages a boss on the handle's stem, preventing axial disengagement and rotational movement, ensuring secure and proper attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple attachment structure is used for replacement heads, then ease of manufacture is improved, but coupling reliability deteriorates leading to inadequate retention
Solution Approach 1:
The boss is divided into distinct functional sections: an undercut section for axial retention and a knurling section for rotational control. This segmentation allows each section to perform its specific function effectively, achieving reliable coupling without complex overall structure
Solution Approach 2:
Different surface treatments are applied to different parts of the boss: undercut geometry at the locking location and knurling at the rotational control location. This local differentiation provides specific functions (axial retention and rotational prevention) without requiring complex structures throughout the entire component
2Reliability
If a secure coupling mechanism is implemented, then coupling reliability is improved, but device complexity increases
Solution Approach 1:
Multiple coupling functions (axial retention, rotational prevention, and loading guidance) are merged into a single integrated boss structure. This consolidation achieves secure coupling without requiring multiple separate components, thereby maintaining simplicity while improving reliability
Solution Approach 2:
The boss serves multiple functions simultaneously: it provides axial retention through the undercut section, prevents rotation through the knurled section, and guides proper loading through its overall geometry. This multi-functionality in a single component achieves reliable coupling without increasing device complexity
3Manufacturing precision
If proper loading is ensured through design, then manufacturing precision is improved, but ease of operation deteriorates due to restricted loading directions
Solution Approach 1:
The boss geometry is designed in advance to guide the replacement head into the correct loading position. The undercut and knurled sections are pre-configured to automatically align components during assembly, ensuring proper loading without requiring high manufacturing precision or complex adjustment operations
Data Source
AI summary
An oral care implement, such as a toothbrush, which includes a handle and a replacement head utilizing a specially designed structure for coupling the replacement head to the handle of the oral care implement. The replacement head comprises a head and a tubular sleeve comprising a cavity for receiving a handle. A protuberance protrudes radially inward from an inner surface of the tubular sleeve for engaging a boss of a stem on the handle to impede rotation of the tubular sleeve about the stem in a first angular direction. A locking tab protrudes radially inward from the inner surface of the tubular sleeve for engaging an undercut surface of the boss to prevent axial disengagement of the tubular sleeve from the stem. The locking tab is circumferentially spaced from the protuberance so that a first axial channel exists therebetween for receiving a section of the boss.