Multi-Axis Pivot Razor Cartridge for Contour Shaving
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Solution Overview
Problem
Conventional safety razors require manual dexterity to articulate the blade cartridge around multiple axes for effective shaving, as the blade cartridge's limited range of motion restricts optimal skin coverage.
Innovation Solution
A razor design featuring a detachable blade cartridge mounted on a pivot sphere that allows rotation around three axes, with a clevis and pivot sphere formed from resilient injection molded plastic, enabling freedom of motion while maintaining orientation relative to the handle, and optional stops to limit the range of motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the blade cartridge is mounted to allow pivoting around one axis parallel to the cutting edge, then the range of motion is improved, but the user still requires manual dexterity to rotate the blade around other axes
Solution Approach 1:
The blade cartridge is mounted on a pivot sphere that enables dynamic multi-axis rotation. The cartridge can freely pivot around three axes (pitch, yaw, and roll) rather than being constrained to a single fixed axis, allowing automatic adaptation to contours of the body being shaved.
Solution Approach 2:
The mounting mechanism is divided into separate rotational degrees of freedom around three orthogonal axes. Each axis of rotation is independent, allowing the blade cartridge to orient itself in multiple directions relative to the handle, thereby eliminating the need for manual articulation by the user.
2Ease of operation
If the blade cartridge is allowed free rotation around three axes, then the ease of operation is improved, but the stability of blade orientation is reduced
Solution Approach 1:
The mounting mechanism uses a spherical pivot joint that changes the rotational parameters from fixed single-axis to multi-axis freedom. The blade cartridge can rotate around three orthogonal axes (pitch, yaw, roll) while maintaining stable contact through the spherical interface, providing both ease of operation and orientation stability.
Data Source
AI summary
A razor includes a cartridge supporting a cutting blade and a handle having an elongate gripping portion and an attachment portion at one end of the handle. The attachment portion supports a pivot member providing removable attachment of the cartridge. The pivot member includes an at least partially spheroid portion configured to be held between spaced-apart ends of two opposed legs, between holes formed in the two opposed legs. Stops protruding from a surface of the at least partially spheroid portion of the pivot member are configured to limit rotation of the cartridge when the cartridge is mounted on the attachment portion. The stops are configured to limit rotation of the cartridge by interaction with relief portions of at least one of the two opposed legs.