Integrally Molded Scissors Structure for Stable Torsional Deformation
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Solution Overview
Problem
The magic hand mechanism requires a large number of parts for assembly, and integrating pillars and pivot points to reduce parts increases the complexity of producing stable large deformation.
Innovation Solution
A scissors structure with arm members and connecting members integrally molded, where the connecting members have low torsional stiffness relative to axial and bending stiffness, allowing for stable large deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each pillar and each pivot point are constructed using different materials, then the magic hand mechanism achieves proper functionality, but the number of parts required for assembly is increased
Solution Approach 1:
The patent merges multiple separate components (pillars and pivot points) into a single integrally molded piece. The connecting member is formed as one continuous structure with varying cross-sectional areas, eliminating the need for separate pivot point components and reducing assembly complexity while maintaining the mechanism's functionality.
Solution Approach 2:
The patent applies local quality by varying the cross-sectional area of the connecting member at different locations. The cross-sectional area is larger at pivot point positions to provide higher stiffness where needed, and smaller in intermediate regions to allow for flexibility and deformation, thus achieving proper mechanical functionality through localized property variation.
2Device complexity
If each pillar and each pivot point are integrally molded, then the number of parts is reduced, but it becomes unclear how to stably produce somewhat large deformation
Solution Approach 1:
The connecting member features a non-uniform cross-sectional area distribution, with larger areas at pivot point locations and smaller areas in between. This local variation in geometry enables stable large deformation by concentrating stiffness where needed while allowing flexibility in deformation zones, solving the manufacturing precision issue.
Solution Approach 2:
The patent changes the geometric parameter (cross-sectional area) of the connecting member along its length. By varying this parameter, the structure achieves both integral molding benefits and controlled deformation characteristics, enabling stable production of large deformation without requiring multiple separate parts.
3Strength
If the connecting member has high torsional stiffness, then structural strength is improved, but large deformation in the torsional direction cannot be achieved
Solution Approach 1:
The connecting member has different cross-sectional areas at different locations, creating local variations in torsional stiffness. At pivot point positions, the larger cross-section provides high stiffness for structural strength, while in intermediate regions, the smaller cross-section allows for torsional deformation, thus achieving both strength and deformation capability.
Solution Approach 2:
The connecting member is designed with dynamic stiffness characteristics through its varying cross-section. The structure adapts its stiffness locally - rigid where needed for strength and flexible where needed for deformation - enabling the mechanism to achieve both structural integrity and large torsional deformation capability.
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 integrally molded scissors structure reduces the number of components, enables stable large deformation, and prevents deformation in directions other than torsion, improving accuracy and reducing the risk of rattling or asymmetry during deformation.
Implementation Method 1
the first connecting member is formed such that its torsional stiffness is low relative to its axial and bending stiffness, so that a somewhat large deformation can be stably produced
Data Source
AI summary
A scissors structure includes a first arm member, a second arm member, and a first connecting member connecting a central portion of the first arm member and a central portion of the second arm member. The first and second arm members and the first connecting member are integrally molded, and the first connecting member is formed such that its torsional stiffness is low relative to its axial and bending stiffness.