Electric Toothbrush Cover Latching Mechanism
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Solution Overview
Problem
Existing electric toothbrush handle designs face challenges in creating a stable, moisture-tight connection that can withstand cleaning forces while allowing easy removal of the drive unit or batteries without requiring excessive effort or tools.
Innovation Solution
A combination of latching and screw engagement is implemented, utilizing a lifting bevel or curve on the housing and cover that converts rotational movement into axial movement, enabling effortless unlocking of the cover while maintaining a secure, force-transmitting connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latching connection is used to firmly connect the cover to the housing, then the connection stability and moisture-tight seal are improved, but the ease of detaching the cover deteriorates
Solution Approach 1:
The latching means are designed with elastic deformation capability, allowing them to dynamically adapt during attachment and detachment. The latching protrusions and recesses can elastically deform to engage firmly during use, yet easily release when force is applied during detachment, resolving the contradiction between stable connection and easy detachment.
Solution Approach 2:
The connection system is segmented into multiple latching means distributed around the cover-periphery, each independently capable of engagement and disengagement. This segmentation allows progressive detachment rather than requiring simultaneous release of all connection points, improving ease of operation while maintaining overall connection stability.
2Ease of operation
If a non-positive connection is used to allow easy removal of the cover, then the ease of operation is improved, but the ability to transmit cleaning forces deteriorates
Solution Approach 1:
The invention merges two connection types: a non-positive connection (cover resting on housing edge) for easy removal, and positive latching connections (latching protrusions and recesses) for force transmission. The merging of these connection mechanisms allows the system to exhibit both easy removability and strong force transmission capability depending on the operational phase.
Solution Approach 2:
The latching means are pre-positioned and pre-loaded during the attachment phase, creating a strong connection before cleaning forces are applied. This preliminary action ensures the connection is already strengthened and ready to transmit forces, while still allowing easy detachment when needed.
3Strength
If multiple latching means are used to ensure stable connection, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
The latching means are designed as universal, identical structures that perform multiple functions: providing connection strength, ensuring moisture-tight seal, and enabling easy detachment. Each latching means is a simple protrusion-recess pair that fulfills all these requirements simultaneously, avoiding the need for complex specialized components for each function.
Solution Approach 2:
All latching means are designed with homogeneous structure and geometry, using the same protrusion and recess shapes distributed around the periphery. This homogeneity simplifies manufacturing and assembly compared to using different types of latching mechanisms, reducing device complexity while maintaining strong connection through multiple identical elements.
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 solution provides a firm, moisture-tight seal that can transmit cleaning forces effectively while allowing easy detachment of the cover, facilitating tool-free disassembly and maintenance without unintentional loosening.
Implementation Method 1
at least one lifting bevel or curve is provided on the housing and/or the cover that rises toward the longitudinal axis of the housing, via which the cover can be lifted off the housing axially by rotating it about the longitudinal axis of the housing and the latching means can be released
Data Source
Figure 1~6
Figure 2~3
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AI summary
The invention relates to a handpiece of an electric toothbrush having a housing in which a drive unit is received. Said housing has a front or rear housing opening that can be closed by a cover in a preferably moisture- and liquid-proof manner. Snap-in means are provided on the housing and/or the cover for snap-locking the cover on the housing. The aim of the invention is to provide a combination of snap-in and threaded engagement for releasing the snap-in connection between the cover and the housing. For this purpose, at least one draft taper or curve, increasing in relation to the longitudinal axis of the housing, is provided on the housing and/or the cover. The cover can be axially lifted using said draft taper by twisting it about the longitudinal axis of the housing and the snap-in means are released. The draft taper or curve allows a threaded engagement of the cover with the housing and effects, for releasing the snap-in connection, a translation of a rotational movement of the cover into an axial movement of the same in a screw-on type manner. The snap-in means can be released in a power-saving manner by twisting the cover and they are forced to unlock by way of a restricted guidance having a threaded or curve engagement. The combination of snap-in connection of the cover and the housing and the draft taper or curve allowing a threaded or curve engagement for detaching the cover by twisting the same allows for a firm connection between the cover and the housing transmitting even high cleaning forces while facilitating a comparatively power-saving unlocking of the snap-in connection.