Razor Assembly Recovering Force Dynamics
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Solution Overview
Problem
Conventional razor assemblies with rotational motion for shaving blades face challenges in achieving an appropriate rotation range and recovering force, leading to either stiff rotation or inadequate contact with the skin, resulting in inefficient shaving and potential skin irritation.
Innovation Solution
A razor assembly with a recovering force-providing unit that increases recovering force at a greater rate in the second pivot section than the first, allowing for a wider rotation range and smoother shaving, while maintaining sufficient support during the shaving process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recovering force is increased to maintain good contact between razor cartridge and skin, then contactability is improved, but rotation becomes stiff
Solution Approach 1:
The recovering force-providing unit is designed to dynamically adjust the recovering force based on the rotational angle. The force increases as rotation progresses, providing stronger contact force when the cartridge is rotated away from the skin, while allowing smoother initial rotation. This dynamic adjustment resolves the contradiction between maintaining contact and enabling smooth rotation.
2Adaptability or versatility
If rotation range is increased to accommodate curvy skin areas, then adaptability is improved, but excessive rotation makes shaving inconvenient
Solution Approach 1:
The patent defines a specific rotation angle parameter (α) that ranges from 0° to 45°, which is optimized to balance adaptability and convenience. This angular parameter change allows the cartridge to accommodate curvy skin areas while preventing excessive rotation that would make shaving inconvenient. The recovering force also changes with this angle parameter, increasing as the angle increases.
3Ease of operation
If recovering force is decreased to enable smooth rotation, then rotation smoothness is improved, but contactability deteriorates
Solution Approach 1:
The recovering force acts periodically during the rotation process, with different force magnitudes at different rotational stages. Initially, when rotation begins, the force is lower to allow smooth movement. As rotation progresses and the cartridge moves away from the skin, the force increases periodically to maintain contact. This periodic variation in force resolves the contradiction between smooth rotation and contactability.
4Ease of operation
If rotation range is decreased to prevent excessive rotation, then shaving convenience is improved, but adaptability to curvy skin deteriorates
Solution Approach 1:
The recovering force-providing unit is pre-configured with a spring mechanism that is preliminarily compressed to store elastic energy. This preliminary action ensures that as the cartridge rotates and moves away from the skin, the stored energy is released to provide the necessary recovering force, enabling the cartridge to adapt to curvy skin areas while maintaining shaving convenience through the controlled 0° to 45° rotation range.
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
The solution enables efficient and comfortable shaving by providing the necessary recovering force and rotation range, reducing skin irritation and improving shaving performance, especially on curvy skin areas.
Implementation Method 1
a recovering force-providing unit configured to provide the razor cartridge having been rotated about the first rotational axis from a rest position with a recovering force for returning the razor cartridge to the rest position
Data Source
Figure 1A~1B
Figure 2(a)~2(c)
Figure 3
AI summary
In some embodiments, the present disclosure provides a razor assembly including a razor cartridge, razor handle, and recovering force-providing unit. The razor cartridge includes a shaving blade having a cutting edge and a blade housing receiving the shaving blade longitudinally. The razor handle is connected to the razor cartridge rotatably about a first rotational axis parallel to longitudinal direction within a rotation range. The recovering force-providing unit provides the razor cartridge rotated about the first rotational axis from a rest position with recovering force returning the razor cartridge to the rest position. The rotation range includes a first pivot section between the rest position and first angle, and a second pivot section between the first angle and a greater second angle. The recovering force increases as the razor cartridge rotates with an increasing rotational angle, at an increasing rate that differs between the first and second pivot sections.