Coupling Structure for Personal Care Device Head Release
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Solution Overview
Problem
Existing personal care devices, such as shaving devices, face issues with coupling mechanisms that do not easily release the head structure from the base structure when torque is applied about the central axis, leading to potential damage during misuse or accidental falls.
Innovation Solution
The implementation of coupling elements with inclined surfaces that cooperate with co-operating surfaces, allowing for easy release by rotating the coupling elements about the central axis, providing tactile and visual feedback, and distributing rotational forces over a large contact area to minimize wear and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring element is used to retain the coupling element against a sloped surface, then the coupling structure can release under axial force or torque, but it cannot release when torque is applied in the rotational direction along the central axis, potentially causing damage
Solution Approach 1:
The coupling element is segmented into multiple functional surfaces: a first inclined surface for engagement during normal operation, a second inclined surface for release under axial force, and a third inclined surface for release under rotational torque. This segmentation allows each surface to handle specific release conditions independently, ensuring comprehensive protection against damage while maintaining ease of operation.
Solution Approach 2:
The coupling mechanism transitions from a static spring-retained design to a dynamic multi-surface inclined design. The third inclined surface dynamically engages with the retaining structure when rotational torque is applied, enabling the coupling to adapt its release mechanism based on the direction and type of force applied, thereby preventing damage across all operational scenarios.
2Strength
If the coupling element is retained by a spring element against a sloped surface, then release is possible under certain conditions, but the contact area is limited leading to increased wear
Solution Approach 1:
The solution extends the release mechanism from a single-point or single-surface contact to a multi-surface contact system distributed around the coupling element. The first, second, and third inclined surfaces are arranged circumferentially, distributing the contact area across multiple dimensions. This increases the total contact area with the retaining structure, reducing stress concentration and wear at any single point while maintaining reliable release functionality under various force conditions.
3Ease of operation
If the coupling elements are rotated to release the head structure, then easy release is achieved, but the mechanism may not provide sufficient tactile and visual feedback to the user
Solution Approach 1:
The inclined surfaces are designed to provide both tactile and visual feedback during the release rotation. As the coupling element rotates to engage or disengage the inclined surfaces with the retaining structure, the user can feel the mechanical interaction (tactile feedback) and observe the movement and position changes (visual feedback). This feedback mechanism confirms to the user that the release action is occurring, enhancing ease of operation by providing clear sensory confirmation of the coupling state.
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 secure coupling and easy release of the head structure from the base structure, preventing damage during torque application, and providing a user-friendly mechanism for cleaning and maintenance.
Implementation Method 1
a first inclined surface of at least one of the first and second coupling elements cooperates with a first co-operating surface of the other of the first and second coupling elements thereby driving the first and second coupling elements away from each other
Implementation Method 2
a second inclined surface of at least one of the first and second coupling elements cooperates with a second co-operating surface of the other of the first and second coupling elements thereby driving the first and second coupling elements away from each other
Data Source
AI summary
A personal care device like a shaving device (1) comprises a base structure (2) and a head structure (3). The head structure comprises a first coupling element (5) and at least a head support structure (4) configured to hold at least one treatment head (4′). The base structure comprises a second coupling element (6). The coupling elements can releasably be coupled to each other for coupling the head structure to the base structure. By rotating the coupled coupling elements with respect to each other in a first rotational direction about a central axis (9), a first inclined surface (15) of at least one of the first and second coupling elements cooperates with a first co-operating surface (26) of the other of the first and second coupling elements thereby driving the first and second coupling elements away from each other in an axial direction extending parallel to the central axis.