Kirigami Gripping Tool Two-Layer Structure Shear Stress
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Solution Overview
Problem
Existing gripping devices based on flexible sheet materials face issues with concentrated shear stress and insufficient rigidity at the fingertip, limiting their practical application, especially in hygienic and hazardous environments.
Innovation Solution
A gripping tool utilizing a two-layer structure with a covering layer and core layer, tendon portions with internal strings, pull portions acting as pulleys, and detachable fingertips to ensure strong pulling force and adaptability to gripping targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If actuating tabs are pulled in a single-layer flexible sheet gripping device, then the gripping action is achieved, but shear stress concentrates in the slot causing structural weakness
Solution Approach 1:
The patent applies composite materials by creating a two-layer structure where a first flexible sheet layer and a second flexible sheet layer are bonded together. The slot passes through both layers, distributing the shear stress across multiple material interfaces and structural planes, thereby preventing stress concentration that would occur in a single-layer structure.
Solution Approach 2:
The patent segments the gripping device into multiple independent layers (first flexible sheet layer and second flexible sheet layer) that are bonded together. This segmentation allows the slot to be distributed across multiple structural planes, reducing the stress burden on any single slot location while maintaining the overall gripping function.
2Ease of manufacture
If a single-layer flexible sheet structure is used, then manufacturing simplicity is maintained, but rigidity at the fingertip is insufficient
Solution Approach 1:
The patent uses composite materials by bonding a first flexible sheet layer with a second flexible sheet layer. This composite structure provides enhanced rigidity at the fingertip region where the layers work together to resist deformation, while still maintaining flexibility in other regions for gripping motion.
Solution Approach 2:
The patent applies local quality by having different layers provide different functional properties. The multi-layer construction specifically enhances rigidity where needed (at the fingertip) while preserving flexibility in other areas, allowing each region of the structure to have the appropriate mechanical properties for its function.
3Reliability
If disposable gripping tools are used in hygienic environments, then hygiene requirements are met, but structural durability during use is reduced
Solution Approach 1:
The patent applies composite materials through the two-layer flexible sheet structure, which distributes mechanical stresses more effectively than single-layer designs. This enhanced structural integrity allows the disposable tool to maintain its functionality and structural durability throughout the duration of use while still being disposable for hygiene reasons.
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 gripping tool enables strong and stable grasping of objects without shearing stress concentration, allowing for disposable use in hygienic and hazardous environments, enhancing practicality and versatility.
Implementation Method 1
tendon portions 120 each having a string portion 122 inside and transmitting a force pulling the gripping portion 110 from both sides
Implementation Method 2
pull portions 130 each being connected to the tendon portions 120 and functioning as a pulley
Data Source
AI summary
The gripping tool according to the disclosed technology is a gripping tool to grip a gripping target based on a principle of driving kirigami, the gripping tool including, gripping portion being sheet-shaped and covering the gripping target, tendon portion having string portion inside and pulling the gripping portion from both sides, pull portion being connected to the tendon portion and functioning as a pulley, fingertips portion being attached to the gripping portion by socket, wherein, the gripping portion is a two-layer structure, the two-layer being a layer of covering layer and core layer.