Scissor Guide Spherical Protrusion Safety
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Solution Overview
Problem
Hair scissors often have sharp tips that can cut, scratch, or puncture barbers' hands, leading to safety concerns, while attempts to make them safer, such as using dull rounded tips, result in reduced cutting efficacy.
Innovation Solution
Designing a pair of scissors with oppositely moveable scissor arms that include spherical protrusions extending from the arm tips, allowing the scissors to pivot from an open to a closed position without the tips touching, creating a recess and a protective space for safe hair cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sharp tips are used on scissor arms, then cutting efficacy is improved, but safety deteriorates as the tips can cut, scratch, or puncture the barber's hands
Solution Approach 1:
A spherical guide tip is introduced as an intermediary element between the scissor arm and the barber's finger. This guide tip contacts the finger surface and prevents the sharp cutting edge from contacting the skin, thereby maintaining safety while preserving cutting performance through the spherical geometry that guides proper scissor closure.
2Object-affected harmful factors
If dull rounded tips are used on scissor arms, then safety is improved, but cutting efficacy deteriorates
Solution Approach 1:
The scissor arm is designed with differentiated local qualities: the distal end features a spherical guide tip with a specific radius of curvature that is softer and rounded for safety, while the cutting edge portion maintains its sharp, precise geometry for effective hair cutting. This localized differentiation allows each part of the scissor arm to optimize its specific function without compromising overall performance.
3Object-affected harmful factors
If spherical protrusions are added to arm tips, then safety is improved by creating protective space, but device complexity increases
Solution Approach 1:
The guide tip is designed as a spherical protrusion with a specific radius of curvature that extends from the distal end of the scissor arm. This spherical geometry naturally creates a protective space when contacted by the finger, preventing the sharp cutting edge from contacting the skin while maintaining simple manufacturing through standard spherical milling or forming operations.
Data Source
AI summary
A pair of scissors with at least one protective protrusion extending distally from the arm tip of at least one of the scissor arms is disclosed. The pair of scissors may include a cut-out in each scissor arm adjacent to the arm tip that forms a generally arc-shaped recess. The protective protrusion may be generally spherical or ovoidal in shape and may radiate in 360 degrees from the arm tip.