Electric Shaver Outer Blade Cassette Nesting Design
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Solution Overview
Problem
Existing electric shavers with vertically movable outer blade frames have poor skin-following capability and expose the holding frame and joint portions, compromising their high-quality impression and making replacement costly.
Innovation Solution
An electric shaver design where the holding frame is detachably attached from the underside to the outer peripheral frame, allowing the outer peripheral frame to cover the entire holding frame, preventing exposure and enabling easy replacement of the outer blade cassette without additional design costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the holding frame is allowed to move vertically with respect to the outer peripheral frame to improve skin-following capability, then the skin-following capability is improved, but the holding frame and joint portion become exposed to the outside, spoiling the high quality impression
Solution Approach 1:
The outer peripheral frame is designed to entirely cover the holding frame from the outside, creating a nested structure where the holding frame is hidden within the outer peripheral frame. This nesting arrangement allows the holding frame to move vertically for skin-following capability while preventing exposure of the holding frame and joint portion, thus maintaining aesthetic appearance.
2Ease of manufacture
If the outer blade cassette is designed as a replaceable unit, then replacement work becomes simple and economical, but the joint portion between holding frame and outer peripheral frame becomes exposed, spoiling the high quality impression
Solution Approach 1:
The outer peripheral frame entirely covers the holding frame, creating a nested structure that hides the joint portion between these components. This allows the outer blade cassette to be designed as a replaceable unit for ease of manufacture and replacement, while the nested outer peripheral frame conceals the joint portion to maintain aesthetic appearance.
3Shape
If surface treatment is performed on the holding frame to enhance design, then aesthetic appearance is improved, but manufacturing cost increases and replacement becomes more expensive
Solution Approach 1:
The aesthetic function is extracted from the holding frame and transferred to the outer peripheral frame. Instead of performing surface treatment on the holding frame, the outer peripheral frame is designed to entirely cover and conceal the holding frame, providing the aesthetic appearance without requiring costly surface treatment on the replacement-prone holding frame.
Solution Approach 2:
The outer peripheral frame serves multiple functions: it provides aesthetic appearance by covering the holding frame, protects the joint portion, and maintains a compact structure. This multi-functionality eliminates the need for additional surface treatment on the holding frame, reducing manufacturing costs while maintaining aesthetic appearance.
Data Source
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AI summary
An electric shaver in which a blade frame part 4 is attached to an upper portion of a body part 3, the blade frame part 4 including an outer blade 5, an outer blade frame 13 to fix the outer blade 5 thereto, a holding frame 14 to hold the outer blade frame 13 vertically movable, and an outer peripheral frame 12 connected to the holding frame 14, the upper portion including an inner blade 1. The holding frame 14 is detachably attached to the outer peripheral frame 12 from an under side thereof, and the outer peripheral frame 12 entirely covers an outer periphery of the holding frame 14.