Pivoting Brush Head With Rotating Bristle Groups for Even Skin Pressure
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Solution Overview
Problem
Existing brush heads for body care devices struggle to achieve proper force distribution across different skin areas, as they lack the ability to adjust pressure forces effectively, leading to potential skin irritation and inadequate cleaning.
Innovation Solution
A brush head design featuring a carrier with multiple bristle groups, allowing rotation and pivoting about distinct axes, combined with elastic means and a supporting frame, enables adjustable pressure distribution by allowing the bristles to bend and tilt, ensuring a homogeneous cleaning effect without skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed brush head design is used, then the structure is simple and easy to manufacture, but the pressure force distribution cannot be adjusted for different skin areas
Solution Approach 1:
The brush head design incorporates dynamic elements including a pivotable carrier that can tilt relative to the housing about a second axis perpendicular to the rotation axis, and bristle groups that can independently rotate about third axes. This dynamic structure allows the bristles to automatically adjust their orientation and pressure distribution according to the curvature and sensitivity of different skin areas, transforming a static fixed design into an adaptive system that responds to operational conditions.
Solution Approach 2:
The brush head is divided into multiple independent carrier parts, each carrying a specific bristle group. Each carrier part can rotate independently about its own third axis and can pivot collectively about the second axis. This segmentation allows different sections of the brush head to independently adjust their pressure and orientation, enabling customized pressure force distribution across different skin areas while maintaining manufacturing feasibility through modular construction.
2Adaptability or versatility
If uniform pressure is applied by all bristles, then the manufacturing is simple, but different skin areas with different sensitivities cannot be properly treated
Solution Approach 1:
The dynamic adjustment mechanism allows the brush head to automatically adapt to different skin areas without requiring manual pressure adjustment by the user. The pivotable carrier and independently rotatable bristle groups respond passively to the contours and sensitivity variations of the skin, distributing pressure forces appropriately across different areas. This eliminates the need for complex manual control mechanisms while providing customized treatment for sensitive versus robust skin zones.
Solution Approach 2:
The brush head design enables self-adjustment of pressure distribution through its mechanical degrees of freedom. As the user applies the brush head to different skin areas, the carrier pivots and bristle groups rotate automatically in response to the skin's curvature and resistance, creating optimal pressure distribution without user intervention. The system serves itself by using the natural interaction between the brush head mechanics and skin surface to achieve adaptive pressure control.
3Adaptability or versatility
If the brush head is fixed during rotation, then the rotation mechanism is simple, but the bristles cannot tilt to accommodate skin curvature
Solution Approach 1:
The connection mechanism between the carrier and housing incorporates two degrees of freedom: rotation about the first axis (driven by the actuator) and pivoting about the second axis perpendicular to it. This dynamic connection allows the carrier to maintain rotational motion while simultaneously tilting to follow skin curvature. The mechanical design achieves this through a pivot joint or similar mechanism that decouples the rotation drive from the contact surface orientation, enabling the bristles to adapt to three-dimensional skin topography.
Solution Approach 2:
The brush head design adds a second rotational dimension by allowing the carrier to pivot about an axis perpendicular to the primary rotation axis. This transforms the motion from simple two-dimensional rotation to three-dimensional orientation control. The bristle groups can now tilt in addition to rotating, providing contact adaptation in multiple directions simultaneously, which is essential for conforming to the complex curvature of facial and body skin surfaces.
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
The design provides a more effective and gentle cleaning experience by allowing for adjustable pressure distribution, accommodating varying skin sensitivities and ensuring thorough exfoliation and cleansing without causing discomfort.
Implementation Method 1
the bristles are able to clean and cleanse the skin
Implementation Method 2
the carrier is rotatable about the first axis and pivotable about a second axis perpendicular to the first axis
Implementation Method 3
at least one of the plurality of carrier parts comprises a shaft defining a third axis about which the corresponding bristle group is rotatable
Data Source
AI summary
The present invention relates to a brush head (10, 10a, 10b, 10c) for use with a body care device (100), comprising a plurality of bristles (22, 22a-22e), a carrier (16) for fixedly carrying the plurality of bristles (22, 22a-22e), and connection means for connecting the carrier (16) to a housing (50) of the body care device (100) defining a first axis (14), so that, when the brush head is connected to the housing (50), the carrier (16) is rotatable about the first axis (14) and pivotable about a second axis (20) perpendicular to the first axis (14) with respect to the housing (50), wherein the carrier (16) comprises a plurality of carrier parts (17), each fixedly carrying a corresponding one of a plurality of bristle groups (26, 28, 30), and wherein at least one of the plurality of carrier parts (17) comprises a shaft defining a third axis (40, 42, 44) about which the corresponding bristle group (26, 28, 30) is rotatable.