Rotary Shaver Head Segmented Coupling for Skin Contour Adaptation
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Solution Overview
Problem
Current rotary electric shavers experience abrupt transitions over skin contours, leading to discomfort and potential skin pinching, and the detachable shaving head is prone to damage when dropped due to a single attachment point.
Innovation Solution
A rotary electric shaver design featuring a detachable shaver head assembly with a flexible sleeve and a keyed coupling system that allows for secure attachment and easy detachment, enabling smoother skin contact and reduced risk of damage by allowing the head to decouple upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer cutters extend individually outward of the frame, then the shaver can cut hair effectively, but the transition over skin contours becomes abrupt causing discomfort and skin pinching
Solution Approach 1:
The shaver head is divided into a stationary frame portion and a movable cutter assembly that can independently move relative to the frame. This segmentation allows the cutters to follow skin contours while the frame remains stable, resolving the contradiction between effective hair cutting and comfortable skin contact.
Solution Approach 2:
The cutter assembly is made dynamic by allowing it to move relative to the frame through a coupling mechanism. This dynamic capability enables the cutters to adapt to varying skin contours during shaving, eliminating the abrupt transitions that cause discomfort while maintaining effective cutting performance.
2Device complexity
If the shaving head is attached only at a center point, then the attachment mechanism is simple, but the shaving head is susceptible to damage when dropped
Solution Approach 1:
The attachment system is segmented into multiple attachment points distributed across the shaver head rather than a single center point. This distribution of attachment points strengthens the overall connection and allows the head to decouple safely during drops, preventing damage while maintaining a relatively simple attachment mechanism.
Solution Approach 2:
The attachment mechanism incorporates a decoupling feature that allows the shaving head to separate from the handle upon impact. This beforehand cushioning design prevents the transmission of impact forces that would otherwise damage the single-point attachment, thereby improving reliability without significantly increasing complexity.
3Stability of the object's composition
If the outer cutters are held in a fixed position relative to the frame, then the structure is stable, but the skin is forced up over the edges causing dragging and pinching
Solution Approach 1:
The cutter assembly is designed to move dynamically relative to the frame through a coupling mechanism, allowing the cutters to adapt to skin contours during shaving. This dynamic capability eliminates skin pinching and dragging while maintaining sufficient stability for effective cutting through the coupled connection.
Solution Approach 2:
A coupling mechanism acts as an intermediary between the stationary frame and the movable cutters. This intermediary allows relative movement that prevents skin pinching while maintaining the structural connection needed for stable cutting, resolving the contradiction between stability and skin comfort.
Data Source
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AI summary
A rotary electric shaver (100) includes a handle assembly (102) having a housing (110), a motor disposed in the housing, a drive shaft (206) operatively connected to the motor and extending through the housing, and a socket (204) for securing a shaver head (104) thereto. The shaver head assembly includes a coupling (202) for detachable coupling to the socket. The coupling is configured to allow the shaver head to be detachably coupled to the handle assembly in at least two different orientations of the shaver head relative to the handle assembly.