Elastic Pin Razor Blade Assembly Rotation
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Solution Overview
Problem
Razor assemblies with interchangeable blade assemblies often lack freedom of movement due to restrictive attachment mechanisms, which can lead to increased risk of cuts during shaving as the shaving head cannot adapt to skin contours.
Innovation Solution
An elastic pin with a pair of prongs forming a convex head at the distal end, allowing for rotational movement of the blade assembly relative to the handle, and a spring to maintain alignment and apply pressure for a closer shave, reducing the need for additional interconnecting members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a restrictive attachment mechanism is used to securely attach the blade assembly to the handle, then the attachment reliability is improved, but the freedom of movement of the blade assembly deteriorates
Solution Approach 1:
The attachment mechanism transitions from a static rigid connection to a dynamic system where the blade assembly can rotate and pivot relative to the handle. The spherical envelope interface enables continuous adjustment of the blade angle during shaving operations, allowing the system to adapt to varying skin contours while maintaining secure attachment.
Solution Approach 2:
The distal end of the elastic pin forms a convex head with a substantially spherical envelope that interfaces with a corresponding spherical recess in the blade assembly. This spherical geometry allows rotational movement in multiple directions while maintaining point contact and secure attachment, resolving the contradiction between stability and freedom of movement.
2Adaptability or versatility
If additional interconnecting members are added to enable rotational movement, then the freedom of movement is improved, but the device complexity increases
Solution Approach 1:
The attachment function and rotational movement capability are merged into a single integrated elastic pin component. The pin simultaneously provides secure attachment through its prongs engaging with the handle and blade assembly, while its spherical head enables rotational movement, eliminating the need for separate hinges, joints, or additional interconnecting members.
Solution Approach 2:
The elastic pin serves multiple functions: it acts as an attachment fastener, a rotational joint, and a positioning element all in one component. This multi-functional design achieves freedom of movement without increasing device complexity, as the single pin replaces what would traditionally require multiple separate parts.
3Ease of manufacture
If a simple attachment mechanism is used to reduce device complexity, then the ease of manufacture is improved, but the reliability of secure attachment deteriorates
Solution Approach 1:
The elastic pin utilizes material elasticity and spring properties to achieve secure attachment. By changing the physical state from rigid to elastic, the pin can deform during attachment and then maintain constant attachment force through its elastic recovery, providing reliable secure attachment with a simple single-piece structure that is easy to manufacture.
Solution Approach 2:
The elastic pin automatically maintains secure attachment through its inherent elastic properties without requiring additional locking mechanisms or complex fastening systems. The pin's elasticity enables it to self-adjust and maintain optimal attachment force, providing reliable secure attachment through its own material properties rather than through complex mechanical means.
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 enhances the freedom of movement of the blade assembly, allowing it to adapt to skin contours, resulting in an improved shaving experience with reduced risk of cuts and a more uniform shave.
Implementation Method 1
The elastic pin may be configured to elastically deform such that the pair of prongs may be moved closer together to form an angle less than the rest angle β between the prongs
Implementation Method 2
a spring to maintain alignment and apply pressure for a closer shave
Data Source
AI summary
This application relates to an elastic pin for selectively attaching a blade assembly to a razor handle may be provided. The elastic pin may comprise a pair of prongs attached at a proximal end, extending to a distal end. The pair of prongs may have an angle β therebetween. A respective distal end of each prong of the pair of prongs may form a convex head. The convex heads may be configured to define a substantially spherical envelope at the distal end of the elastic pin.