Scissors Pivoting Structure Width Thickness Ratio
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Solution Overview
Problem
Conventional scissors have a large width to thickness ratio in their heads, making them cumbersome, difficult to use in narrow spaces, and limited in cutting thick objects, with external springs prone to damage and increasing production costs.
Innovation Solution
The scissors feature a pivoting structure with a width to thickness ratio of no more than 8.0, forged construction for increased rigidity, and a built-in torsion spring for compactness and durability, along with a locking mechanism for convenience and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the scissors head is formed by sheet metal stamping with a large width to thickness ratio, then the manufacturing process is favorable, but the scissors head becomes blunt, cumbersome, and cannot meet operational requirements for narrow spaces
Solution Approach 1:
The patent changes the width to thickness ratio parameter of the scissors head from the conventional large ratio (about 1.0) to a small ratio (no more than 8.0), transforming the geometric parameters to achieve both manufacturability and operational effectiveness in narrow spaces
2Ease of manufacture
If the scissors head is formed by sheet metal stamping with uniform thickness, then the manufacturing is simple, but the shear-compression intensity is limited and cannot cut thick objects
Solution Approach 1:
The patent applies local quality by creating non-uniform thickness distribution in the scissors head, with the thickness being no more than 8.0 times the width at the connection between scissors heads, providing localized strength enhancement where needed while maintaining manufacturing simplicity
3Ease of operation
If an external spring is arranged between the first handle and the second handle, then the scissors automatically spring back after cutting, but the space occupied by the scissors is large and the spring is prone to damage
Solution Approach 1:
The patent applies the nesting principle by integrating the spring mechanism within the internal structure of the scissors head, where the spring is positioned in the space between the first and second scissors heads, making the spring compact and protected while maintaining the automatic spring back function
4Ease of operation
If an external spring is used between the handles, then the handles automatically separate after cutting, but a large force is required to overcome the spring resistance during shearing
Solution Approach 1:
The patent changes the spatial arrangement of the spring from an external longitudinal arrangement to an internal arrangement within the scissors head, utilizing the width dimension rather than extending in the length direction, thereby reducing the moment arm and spring resistance while maintaining the automatic separation function
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 allows for efficient cutting of thick objects, improved rigidity, reduced risk of spring damage, and a more compact, user-friendly structure with enhanced operational comfort and convenience.
Implementation Method 1
a built-in torsion spring for compactness and durability
Data Source
AI summary
Scissors including handles and scissors heads. The handles include a first handle and a second handle, and the scissors heads include a first scissors head and a second scissors head. The first scissors head is provided with a first blade and extends from one end of the first handle, and the second scissors head is provided with a second blade and extends from one end of the second handle. The first scissors head is pivotally hinged to the second scissors head via a pivoting structure, and the first scissors head and the second scissors head have a small width to thickness ratio at the connection between the scissors heads and the pivoting structure. The scissors increase the rigidity of the scissors head, enhance the shear-compression intensity of the scissors, facilitate the cutting of thick objects, and meet the requirements of various objects to be operated.