Scissors Ringlet with Three-Axis Pivoting for Finger Comfort
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Solution Overview
Problem
Existing scissors designs, particularly for barbers, fail to provide full directional flexibility and a secure fit for various finger shapes and sizes, leading to discomfort and increased risk of arthritis due to limited rotation and flexibility of ringlets.
Innovation Solution
The development of scissors with a ringlet that rotates and bends in every direction, utilizing a flexible material connected via a cone-shaped bore and cylindrical rod system, allowing for three-axis pivoting and accommodating different finger shapes through a secure, stress-reduced design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional rigid ringlets are used in scissors, then structural stability is maintained, but finger comfort and flexibility are reduced leading to arthritis
Solution Approach 1:
The patent applies the dynamics principle by transforming the rigid, fixed ringlet structure into a dynamic system with three degrees of freedom. The ringlet can now rotate around the handle axis, pivot perpendicular to the handle axis, and bend radially, allowing it to adapt dynamically to finger movements and positioning requirements while maintaining structural integrity through controlled flexibility.
Solution Approach 2:
The patent implements parameter changes by modifying the physical properties of the ringlet connection system. Instead of a rigid fixed connection, the patent introduces rotational freedom, pivoting capability, and radial bending ability, fundamentally changing the mechanical parameters from rigid to flexible while maintaining sufficient structural stability for safe operation.
2Adaptability or versatility
If ringlets are made flexible to improve comfort, then finger adaptability increases, but rotational freedom is limited to two directions
Solution Approach 1:
The patent applies the dimensionality change principle by adding a third degree of freedom to the ringlet system. While conventional ringlets provide two degrees of freedom (rotation around handle axis and vertical movement), this patent adds radial bending capability, creating a three-dimensional flexible connection that fully adapts to finger shapes and positions in all directions.
3Ease of operation
If ringlets are made to rotate in multiple directions for full flexibility, then comfort is improved, but structural stability and safety are reduced
Solution Approach 1:
The patent employs flexible shells and thin films by using a thin-walled cylindrical ringlet structure that can bend radially while maintaining its structural integrity. The thin-walled design allows for flexibility in all three directions (rotation, pivoting, and bending) while the material properties and geometric configuration ensure sufficient strength and durability for safe operation.
Data Source
AI summary
A pair of scissors equipped with a three axially pivoting ringlet is presented. The ringlet of the scissors according to current application is comprised of flexible NBR (Acrylonitrile Butadiene Rubber). The ringlet is attached to one handle of the scissors of the current application to provide a thumb's insert, thereby providing proper fit to the user's fingers due to the flexibility of the NBR. The ringlet is attached to the thumb portion of one handle of the scissors via a part that enables the ringlet to rotate in two independent directions and to pivot around one axis that is parallel to handle.