Unidirectional Friction Material With Tiltable Plate Structures
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Solution Overview
Problem
Existing materials with unidirectional friction, such as velvet and bristle forms, do not provide a sufficient difference in frictional behavior between forward and backward motion, which is inadequate for certain applications like skiing and robotics where high friction in one direction and low friction in the other are required.
Innovation Solution
A material comprising plate-like structures attached to a substrate-fabric via stitching, where the plate-like structures are designed to be tiltable and overlapping, allowing for optimal sliding and gripping properties by adjusting the angle between the fabric and the structures, resulting in significantly lower friction during gliding and higher friction during gripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If velvet structures or bristle forms are used to create directional friction, then some difference in frictional behavior between forward and backward motion is achieved, but the difference is not sufficiently high for applications requiring high grip and low glide friction
Solution Approach 1:
The plate-like structures are designed to be tiltable relative to the substrate fabric, allowing them to dynamically change orientation based on the direction of applied force. When force is applied in the glide direction, the plates tilt to present a low-friction edge. When force is applied in the grip direction, the plates remain upright or tilt to present a high-friction surface, thereby dynamically adapting to provide the required extreme difference in frictional behavior
Solution Approach 2:
The plate-like structures have an asymmetric geometry with distinct front and back surfaces, and distinct edges. The plates are attached to the substrate fabric at an angle rather than perpendicular to it, creating an asymmetric configuration that inherently provides different frictional characteristics for forward and backward motion, enabling the extreme difference between grip and glide phases
2Ease of operation
If plate-like structures are made tiltable to enable gliding in one direction, then low friction in the gliding direction is achieved, but the complexity of the structure increases
Solution Approach 1:
The friction surface is segmented into multiple discrete plate-like structures rather than using a continuous surface. Each plate is an independent element that can tilt independently, allowing the system to achieve complex frictional behavior through simple individual components. This segmentation reduces the complexity of each individual element while achieving the desired overall functionality
Solution Approach 2:
The tilting angle of the plate-like structures is optimized to specific ranges (certain angles between the plate surface and substrate fabric) to achieve the desired balance between grip and glide performance. By carefully selecting and controlling the geometric parameters of the plates and their attachment angles, the invention achieves optimal frictional characteristics without requiring overly complex structural mechanisms
3Ease of operation
If the plate-like structures are arranged to overlap and tilt, then optimal sliding and gripping properties are achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention specifies certain ranges for critical parameters including the angle between the plate surface and substrate fabric, the dimensions of the plates, and the spacing between adjacent plates. By defining these parameters as ranges rather than exact values, the invention provides manufacturing tolerance that simplifies production while still achieving the desired frictional performance characteristics
Solution Approach 2:
The overlapping arrangement of plate-like structures creates local variations in frictional properties across the surface. The overlap regions provide enhanced grip while the edges provide smooth gliding. This local differentiation of functional qualities allows the structure to achieve optimal overall performance through relatively simple global arrangement
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
This design enhances the difference in frictional behavior between gliding and gripping phases, enabling more efficient forward motion and improved grip, suitable for applications in sports, robotics, and manufacturing by minimizing friction during movement and maximizing grip when needed.
Implementation Method 1
the frictional resistance of the material, specifically of the plate-like structures, will be smaller in the gliding direction and greater in the gripping direction
Data Source
Figure 1
Figure 2~3
AI summary
Material (10) for providing unidirectional friction, in particular for a ski skin, comprising a substrate-fabric (12) and plate-like structures (18) attached to the substrate-fabric (12), wherein the plate-like structures (18) are arranged on the fabric (12) such that they lie substantially flat against an operative surface (16) of the fabric (12) when a frictional force is applied to the structures (18) in a gliding direction (A) substantially parallel to the operative surface (16) of the fabric (12) and lift up from the operative surface (16) of the fabric (12) at one side when a frictional force is applied to the structures (18) in a gripping direction (B) substantially opposite to the gliding direction (A).