Gecko Adhesive Gripper With Decoupled Load Transmission
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Solution Overview
Problem
Existing directional gecko-adhesive gripper systems face challenges in scaling up for mass production due to complex designs and labor-intensive manufacturing, with limited loading capability in the Y-direction and non-uniform adhesive loading leading to creeping failures and reduced adhesion.
Innovation Solution
A gecko-adhesive gripper system utilizing microwedge controllable adhesives, non-stretchable orthogonal flexible films, and rigid backings with decoupled load transmission in the X-Z and Y-directions, allowing for equal loading capability in all shear directions and scalable manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If string tendons are routed and glued to three-dimensional, pre-drilled holes on fiberglass backings, then the adhesive loading capability in the X-Z plane is optimized, but the manufacturing complexity and labor requirements increase significantly
Solution Approach 1:
The patent extracts the complex three-dimensional pre-drilled hole structure and tendon routing system from the fiberglass backing, replacing it with a simplified two-dimensional backing structure. The load transmission function is transferred to the non-stretchable flexible film that attaches directly to the adhesive patches, eliminating the need for complex internal routing structures while maintaining load-bearing capability.
Solution Approach 2:
The patent introduces a non-stretchable flexible film as an intermediary element between the rigid backing and the adhesive patches. This film serves as a mediator that transmits loads uniformly to the adhesive patches without requiring complex three-dimensional hole structures, thereby simplifying manufacturing while maintaining or improving load transmission efficiency.
2Force
If tendons are attached only along the preferred shear direction (X axis), then the load capability in the X-Z plane is maximized, but the loading capability in the Y (lateral shear) direction is limited
Solution Approach 1:
The non-stretchable flexible film serves multiple functions simultaneously: it transmits loads in the preferred X-Z plane direction while also providing load transmission capability in the Y (lateral shear) direction. This multi-functional design allows the adhesive patches to handle equal amounts of load in all shear directions, enhancing the system's versatility without sacrificing optimized-direction performance.
3Device complexity
If foam is placed on top of the adhesives, then the structure is simplified, but non-uniform loading occurs on the adhesive patches causing creeping problems and reduced adhesive capability
Solution Approach 1:
The patent applies local quality by using a non-stretchable flexible film that maintains its dimensional stability under load, ensuring uniform load distribution across the adhesive patches. Unlike foam that compresses and creates non-uniform loading, the non-stretchable film preserves its local geometric properties, preventing creeping failures and maintaining consistent adhesive performance over time.
4Ease of manufacture
If conventional fiberglass backings with pre-drilled holes are used, then tendon attachment is achieved, but the backings are difficult to manufacture and cut, especially with adhesives attached
Solution Approach 1:
The patent segments the load transmission function from the backing structure itself, placing it instead in the separate non-stretchable flexible film layer. This segmentation allows the backing to be a simple, easy-to-manufacture two-dimensional structure without complex three-dimensional hole patterns, while the film handles the load transmission, making the overall system easier to manufacture and cut.
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 system achieves improved adhesion limits in the Y-direction and overall loading capability, enabling efficient and cost-effective mass production with enhanced durability and uniform loading.
Implementation Method 1
a plurality of microwedges that bend under shear load to increase the surface area of contact with a surface and thereby adhere to the surface
Implementation Method 2
at least one layer of non-stretchable, orthogonal flexible film glued to the thin rigid backing
Data Source
AI summary
A gripper system is provided that includes first and second linear carriages and first and second gecko adhesive patches. The gecko adhesive patches may have first and second surfaces, and a thin rigid backing may be attached to the second surface of the gecko adhesive patches. At least one layer of non-stretchable, flexible film may be glued to the thin rigid backing and a thick rigid backing may be glued to the film. The gripper system may further include a loading film. In other embodiments, the gripper system may include first and second pluralities of support tendons, which may connect the gecko adhesive patches to the carriages.