Curved Razor Blade Orientation for Armpit Recess Shaving
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Solution Overview
Problem
Conventional razors for shaving armpit hair often cause the plastic portion of the head to hit the armpit instead of the blade edge due to the blade edge facing downward, making it difficult to place the blade edge in the armpit recess.
Innovation Solution
The razor design includes a blade edge directed toward the upper side from the central surface, with a curved configuration to facilitate placement in the armpit recess, and features such as comb teeth members for hair management and a guard portion to prevent skin damage, along with a handle design for easy grip and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blade edge faces downward in the conventional razor design, then the structure is simple and easy to manufacture, but the plastic portion of the head part hits the armpit instead of the blade edge, making it difficult to place the blade edge in the armpit recess
Solution Approach 1:
The blade body is inverted in orientation so that the blade edge faces upward rather than downward. This inversion allows the blade edge to properly engage with the armpit recess during shaving, resolving the placement difficulty while maintaining structural simplicity
Solution Approach 2:
The blade body is designed with a curved configuration that凸向 the upper side, creating a shape that naturally fits into the armpit recess. This curvature enables the blade edge to make proper contact with the skin surface in the difficult-to-reach armpit area
2Reliability
If the blade edge faces downward, then the manufacturing process is simple, but the shaving effectiveness is reduced because the plastic portion contacts the skin instead of the blade edge
Solution Approach 1:
By inverting the blade edge orientation to face upward, the design ensures that the sharp blade edge contacts the skin during shaving rather than the plastic housing. This simple orientation change significantly improves shaving effectiveness without complicating the manufacturing process
3Ease of operation
If a curved blade body is introduced to fit the armpit recess, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The blade body incorporates a gentle curve that凸向 the upper side, allowing it to naturally conform to the contours of the armpit recess. This curvature is designed to be minimal and ergonomic, providing better fit and access while avoiding excessive structural complexity
Data Source
AI summary
A razor (1) according to the present disclosure includes: a head part (10) to which a blade body (11) is attached; a handle part (20); a placement surface (L1) that comes into contact with a predetermined plane (P) when the razor (1) is placed on the predetermined plane (P); and a central surface (L2) passing along the placement surface (L1) and passing through a center of the handle part (20) in a thickness direction (T), wherein a blade edge (11A) of the blade body (11) is directed toward an upper side (U) from the central surface (L2) toward the placement surface (L1), when the razor (1) with the head part (10) disposed on the upper side (U) is viewed from a side surface thereof, and the blade body (11) is curved so as to convex toward the upper side (U), when the razor (1) with the head part (10) disposed on the upper side (U) is viewed from the back surface side.