Replaceable Toothbrush Head Locking for Thin, Leak-Resistant Brushing
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Solution Overview
Problem
Existing toothbrush designs with replaceable brush heads suffer from issues such as increased thickness, water seepage, and inadequate locking mechanisms, leading to discomfort and inefficiency in brushing, especially when used for back teeth, and do not effectively address environmental waste concerns.
Innovation Solution
A toothbrush design featuring a truncated dispensing platform with a stepped backside and a replaceable brush head that uses a latch mechanism for secure attachment and detachment, ensuring ergonomic fit and comfort, with audible cues for alignment, applicable to both manual and electric toothpaste-dispensing toothbrushes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a replaceable brush head is designed without a stepped backside and matching truncated support platform, then the brush head can be simpler in structure, but the combined thickness becomes excessive and uncomfortable for brushing back teeth
Solution Approach 1:
The brush head is segmented into a stepped backside with distinct upper and lower portions, where the upper portion has a bottom interface and the lower portion has a latch post. This segmentation allows the brush head to interface with a truncated support platform in a way that reduces combined thickness while maintaining structural integrity and brushing comfort.
2Device complexity
If a replaceable brush head lacks a latch mechanism, then the attachment structure can be simpler, but water can seep between the brush head and toothbrush unit
Solution Approach 1:
The latch mechanism is designed with a latch post on the brush head that engages with a latch groove on the support platform before final attachment is complete. This preliminary engagement action ensures water-tight sealing is established early in the attachment process, preventing water seepage while maintaining a relatively simple overall structure.
3Object-affected harmful factors
If a latch mechanism is added to secure the brush head, then water seepage is prevented, but the device complexity increases
Solution Approach 1:
The latch mechanism is implemented locally with specific features: a latch post on the lower portion of the brush head backside and a corresponding latch groove on the support platform. This localized implementation provides effective water seepage prevention while minimizing overall device complexity by concentrating the locking function in specific areas rather than throughout the entire structure.
4Ease of manufacture
If the brush head and support platform have non-circular arc interfaces, then manufacturing may be simpler, but rotational sliding contact for mounting and separation is compromised
Solution Approach 1:
The interfaces between the brush head and support platform are designed with circular arc shapes. This curvature enables smooth rotational sliding contact during mounting and separation operations, improving ease of operation. The circular arc geometry is manufactured using standard machining processes, balancing manufacturability with operational performance.
Data Source
AI summary
A toothpaste-dispensing toothbrush includes a replaceable brush head, a pump head, a truncated dispensing platform attached with a spout, and a handle containing toothpaste. The brush head has a through hole and a stepped backside mating with the truncated dispensing platform by a set of latch mechanisms. The detachment of the brush head requires two steps by using two hands to rotate the brush head then push it off from the dispensing platform. The brush head is provided with an extended lever segment having a latch notch and the truncated dispensing platform has an extended neck portion having a neck post for engaging with the lever notch for additional locking. The stepped backside enables the brush head to brush back teeth with comfort. The applications of the replaceable brush head to a manual toothbrush and a toothpaste-dispensing electric toothbrush are provided.