Acute Angle Cutting Scissors with Fin and Linear Edge
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Solution Overview
Problem
Conventional sewing scissors, such as duckbill scissors, are ineffective for cutting acute angles between sewn layers of material due to their large size, which prevents precise cuts and often result in inadvertently cutting the wrong layer or the seam.
Innovation Solution
A scissors design featuring a first blade with a beveled upper edge and a second blade with a linear outer edge that transitions to a curvilinear fin, allowing for precise cutting at acute angles by positioning the blades closer to the seam and preventing accidental cuts to the base layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If common duckbill scissors are used to cut along seams, then cutting precision along seams is improved, but the ability to cut acute angles deteriorates
Solution Approach 1:
The scissors blade is segmented into distinct functional zones: a fin portion for separating fabric layers, a linear outer edge for accessing acute angles, and a curvilinear portion for general cutting. This segmentation allows each zone to perform its specific function optimally, resolving the contradiction between seam-cutting precision and acute-angle capability.
Solution Approach 2:
Different portions of the blade are given different geometric qualities tailored to specific cutting needs. The linear outer edge provides the acute angle access needed for corner work, while the curvilinear fin provides layer separation for seam work. This local differentiation of blade properties enables both cutting precision and acute angle adaptability.
2Adaptability or versatility
If embroidery scissors without duckbill are used to cut acute angles, then accessibility to acute angles is improved, but layer separation capability deteriorates
Solution Approach 1:
The invention merges the acute-angle accessibility of embroidery scissors with the layer-separation capability of duckbill scissors into a single integrated blade design. The fin and linear outer edge work together to provide both functions simultaneously, eliminating the need to choose between the two tool types.
Solution Approach 2:
The scissors blade is designed with multi-functionality to perform both seam cutting and acute angle cutting. The fin separates layers while the linear outer edge accesses acute angles, making the tool universal for different cutting scenarios without requiring separate specialized tools.
3Reliability
If duckbill scissors are used for acute angle cuts, then layer separation is maintained, but positioning accuracy at acute angles deteriorates
Solution Approach 1:
The blade design adds a dimensional element with the linear outer edge extending at an acute angle relative to the cutting edge. This creates a new geometric dimension that allows the blade to position itself accurately within acute angle corners while maintaining the fin's layer separation function in the perpendicular dimension.
Data Source
AI summary
A scissors for cutting a layer of material having a seam with an acute angle includes a first blade and a second blade. The first blade extends to a first tip and has a first cutting edge. The second blade extends to a second tip and has a second cutting edge and an outer edge. The second blade is operatively connected to the first blade to selectively move between an open position and a closed position. The outer edge includes a linear portion extending from the second tip to a curvilinear portion, which defines a fin. The linear portion and the second cutting edge define an acute angle therebetween.