Electric appliance for personal care
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Solution Overview
Problem
Existing toothbrush attachments face challenges in achieving simple and secure assembly on the handle, ensuring a firm hold, and effective vibration transmission.
Innovation Solution
The attachment features a socket-like coupling structure with at least two steps of different circumferential geometries and an obliquely angled stop surface, paired with a plug-like coupling structure on the handle, incorporating an anti-twist device and a snap connection mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a horizontal projection of the coupling structure is used to secure the attachment to the handle, then the assembly is secure and firm, but the fit requires high precision and allows fluid penetration
Solution Approach 1:
The invention transitions from a horizontal coupling interface to a vertical insertion interface with an oblique stop surface. The attachment is inserted vertically into the handle along the longitudinal axis, and the oblique stop surface (angled at α between 30°-70°) provides the securing function in a different dimensional orientation, eliminating the need for high-precision horizontal fitting while maintaining secure attachment.
2Reliability
If a horizontal projection coupling structure is used, then the attachment can be secured to the handle, but fluids and dirt can penetrate the interior of the attachment
Solution Approach 1:
By changing from horizontal to vertical insertion with an oblique stop surface, the coupling interface orientation changes, which combined with the snap connection mechanism creates a sealed interface that prevents fluid and dirt penetration while maintaining secure attachment.
Solution Approach 2:
The snap connection mechanism automatically seals the interface when the attachment is inserted vertically. The elastic arms with recesses engage with the flange on the handle, creating a self-sealing effect that prevents fluid penetration without requiring additional sealing components.
3Device complexity
If the vibration drive is positioned away from the coupling interface, then the coupling structure is simpler, but vibration transmission to the attachment is less effective
Solution Approach 1:
The invention merges the vibration drive unit with the coupling interface by positioning the electric motor and eccentric directly in the handle's coupling region. The vertical insertion path and oblique stop surface enable this integration, allowing vibration forces to be transmitted directly through the coupling interface to the attachment, enhancing power transmission while maintaining structural simplicity.
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 ensures secure and efficient assembly, enhances vibration transmission, and provides a robust connection between the handle and attachment.
Implementation Method 1
a stop surface which runs obliquely to a straight insertion direction
Implementation Method 2
a vibration unit comprising an electric motor and an eccentric is arranged in the handle
Implementation Method 3
effective transmission of vibration from the handle to the attachment
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 1e~1f
AI summary
The present invention relates, among other things, to an attachment (60) for personal care, in particular for dental cleaning, which can be attached to a handle (1), wherein the attachment (60) has a base area (61) and a head area (63) which are connected by a neck area (62), wherein the attachment (60) comprises a socket-like coupling structure (70) which has at least two stages (71, 72, 73) with different circumferential geometries and which forms the attachment-side part for an interface (X) with a substantially identical, plug-like coupling structure (40) of a handle (1), wherein the attachment (60) has a stop surface (66) which extends obliquely to a straight insertion direction (R).