Razor Assembly Torsion Spring Pivot Axis
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Solution Overview
Problem
Conventional razor assemblies with pivoting mechanisms about axes parallel to the blade direction often face structural weaknesses, leading to instability and potential deformation over time, especially when attempting to provide pivoting movements perpendicular to the blade axis.
Innovation Solution
A razor assembly design featuring a connecting head pivotable about a rotation axis perpendicular to both the transverse and longitudinal directions of the handle, utilizing a torsion spring or coil spring for restoring force, ensuring stable pivoting without structural deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pivoting mechanism with axis parallel to blade direction is used, then the razor cartridge can pivot between neutral and pivot positions, but the structure becomes weak and unstable over time
Solution Approach 1:
The patent inverts the conventional pivoting axis orientation. Instead of using an axis parallel to the blade direction, the invention uses an axis perpendicular to the blade direction (transverse axis). This inversion fundamentally changes the pivoting mechanism's geometry, allowing the blade housing to pivot relative to the handle in a manner that maintains structural strength while enabling the necessary motion for contact with skin profiles.
Solution Approach 2:
The patent changes the orientation parameter of the rotation axis from parallel to perpendicular relative to the blade direction. This parameter change transforms the pivoting mechanism's characteristics, enabling stable operation without the structural weaknesses associated with conventional designs. The perpendicular axis configuration alters the load distribution and stress patterns, improving overall reliability.
2Adaptability or versatility
If multiaxial pivoting function is added to allow smooth contact with various skin profiles, then shaving performance improves, but the structure becomes complicated and may deform
Solution Approach 1:
The patent implements a dynamic pivoting mechanism where the blade housing can rotate about a transverse axis relative to the handle. This dynamic capability allows the razor to adapt to various skin profiles through controlled pivoting motion. The mechanism includes a pivot axis perpendicular to both the blade direction and handle longitudinal direction, enabling the cutting elements to maintain contact with contoured surfaces while keeping the overall structure relatively simple.
3Stability of the object's composition
If pivoting axis is perpendicular to blade direction, then stable pivoting movement is achieved, but the mechanism requires precise axis orientation
Solution Approach 1:
The transverse pivot axis serves multiple functions simultaneously: it enables pivoting motion for skin profile adaptation, maintains structural stability, and provides a reference orientation for blade alignment. By making the pivot axis perpendicular to both the blade direction and handle longitudinal direction, the mechanism achieves multi-functionality that reduces the impact of manufacturing tolerances while maintaining stable operation.
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 design provides stable and prolonged pivoting movements perpendicular to the blade axis, enhancing shaving performance by maintaining contact with various skin profiles and preventing structural deformation.
Implementation Method 1
a torsion spring configured to be elastically deformed when the connecting head pivots about the rotation axis from a neutral position so that the torsion spring provides a restoring force for the connecting head to return to the neutral position
Implementation Method 2
a torsion spring configured to be elastically deformed when the connecting head pivots about the rotation axis from a neutral position
Data Source
AI summary
A razor assembly includes at least one razor blade having a cutting edge, a blade housing configured to accommodate the at least one razor blade aligned along first direction, a connecting head configured to be detachably coupled to the blade housing, a razor handle configured to support the connecting head so that the connecting head is pivotable about a rotation axis, which is perpendicular to the first direction, and a torsion spring configured to be elastically deformed when the connecting head pivots about the rotation axis from a neutral position so that the torsion spring provides a restoring force for the connecting head to return to the neutral position.