Rotational Safety Razor with Locking Ejector Button
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Solution Overview
Problem
Safety razors with limited mobility due to single-axis pivotal movement fail to closely follow body contours during shaving, necessitating a design that incorporates both pivotal and rotational movements to enhance conformance.
Innovation Solution
A safety razor with a handle featuring a grip portion and a connection portion that rotates about a rotational axis, equipped with an ejector button for locking, allowing rotation, and ejecting the blade unit, combined with a blade unit that pivots about a pivot axis parallel to the blades and rotates about a perpendicular axis, utilizing an elastomeric return force generating member for balanced movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the blade unit is provided with single-axis pivotal movement, then the structure is simple, but the blade unit cannot closely follow body contours during shaving
Solution Approach 1:
The connection portion is designed to rotate relative to the grip portion about a rotational axis, while the blade unit pivots about a pivot axis. This dynamic multi-axis movement system allows the blade unit to adapt to various body contours, resolving the contradiction between conformance and complexity by implementing controlled rotational freedom.
Solution Approach 2:
The invention transitions from single-axis pivotal movement to dual-axis movement by adding rotational movement about a rotational axis that is substantially perpendicular to the blade, complementing the existing pivotal movement about a pivot axis parallel to the blade. This dimensional expansion enables the blade unit to follow complex body contours more effectively.
2Adaptability or versatility
If the connection portion is allowed to rotate freely, then the blade unit can follow body contours better, but the blade unit may become unstable during shaving
Solution Approach 1:
The ejector button mechanism dynamically controls the rotational freedom of the connection portion, allowing rotation when needed for contour conformance while providing locking capability for stability during specific shaving operations, thus balancing adaptability and stability.
Solution Approach 2:
The ejector button changes the operational parameter of the connection portion from locked to unlocked state, enabling controlled transitions between stable fixed position and flexible rotated position, thereby managing the trade-off between stability and adaptability.
3Ease of operation
If the ejector button mechanism is added for blade ejection, then blade replacement is easier, but the device structure becomes more complex
Solution Approach 1:
The ejector button mechanism enables the user to easily eject the blade unit through a simple button press action, making blade replacement a self-service operation that does not require additional tools or complex procedures, thus improving ease of operation.
Solution Approach 2:
The ejector button serves multiple functions: it locks the connection portion in the grip portion, allows rotational movement when needed, and ejects the blade unit for replacement. This multi-functionality justifies the added structural complexity by consolidating multiple operations into a single mechanism.
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
Enables the blade unit to closely follow all body contours during shaving by providing enhanced mobility through dual-axis movement and a secure, easy-to-use mechanism for blade attachment and ejection.
Implementation Method 1
utilizing an elastomeric return force generating member for balanced movement
Data Source
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AI summary
A safety razor including a handle having a grip portion and a connection portion secured to the grip portion. The connection portion rotates with respect to the grip portion about a rotational axis. A blade unit is mounted to the connection portion by a connection member. The handle includes an ejector button having a first position locking the connection portion with respect to the grip portion preventing the connection portion from rotating with respect to the grip portion, a second position allowing the connection portion to rotate with respect to the grip portion, and a third position for ejecting the blade unit from the connection portion.