Open Cell Foam Suction Cup for Rough Surface Adhesion
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Solution Overview
Problem
Traditional suction cups on novelty projectiles fail to adhere effectively to semi-smooth and rough surfaces, requiring wetting to function, which leads to dirt accumulation and staining, and foam suction cups are stiff, resulting in poor surface seals.
Innovation Solution
A suction cup head made of open cell foam with a diameter of 5-20% density, featuring a large face surface, shallow concavity, and a soft, semiporous composition, combined with stabilizing fins and a weight distribution for straight flight, allowing adherence to various surfaces without wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional elastomeric suction cups are used, then they can adhere to smooth flat surfaces, but they fail to adhere to semi-smooth and rough surfaces without wetting
Solution Approach 1:
The suction cup is made from open cell foam material with 5-20% open cell density, allowing the material to conform to surface imperfections while maintaining structural integrity. The porous structure enables the foam to deform and seal around rough surfaces effectively without requiring wetting agents.
Solution Approach 2:
The invention changes the material parameters from traditional elastomeric materials to open cell foam with specific density ranges (5-20%). This parameter change allows the suction cup to maintain both structural stability and surface conformability, enabling effective adhesion across various surface types including rough surfaces.
2Reliability
If traditional suction cups are wetted to improve adhesion to rough surfaces, then adhesion improves, but dirt and grime accumulate creating stains
Solution Approach 1:
The invention eliminates the need for wetting by changing the material parameters to open cell foam. The foam's inherent properties allow it to conform to surfaces and maintain adhesion without external liquids, thereby preventing dirt accumulation and staining on surfaces.
Solution Approach 2:
The invention extracts the wetting requirement from the adhesion process. By using open cell foam material, the suction cup achieves effective adhesion to rough surfaces through material deformation alone, removing the harmful element of moisture that causes staining.
3Reliability
If closed cell foam is used for suction cup, then it is air impervious and can maintain suction, but it is stiff and creates poor surface seals
Solution Approach 1:
The invention uses open cell foam with controlled porosity (5-20% open cell density) that provides both flexibility for surface conformability and sufficient air imperviousness when compressed. The cellular structure allows deformation to seal around surface imperfections while maintaining suction capability.
Solution Approach 2:
The open cell foam acts as a composite material that combines the flexibility needed for surface conformability with the structural integrity required for suction maintenance. The foam's cellular structure provides both deformation capability and air barrier properties when compressed against surfaces.
4Area of stationary object
If the suction cup face surface is made large, then adhesion area increases, but the projectile becomes top-heavy affecting flight stability
Solution Approach 1:
The suction cup head is designed with a disproportionately large face surface area relative to the projectile body, concentrating the mass and adhesive function at the front. This local quality enhancement allows large adhesion area while managing overall weight distribution through strategic placement.
Solution Approach 2:
The projectile incorporates weighting elements in the rear portion to counterbalance the large suction cup head at the front. This counterweight arrangement maintains the center of gravity in an optimal position for stable flight while allowing the front to have sufficient adhesion area.
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 novel foam suction cup design enables prolonged adhesion to both smooth and rough surfaces by conforming to surface imperfections and maintaining air pressure differential, ensuring safe and effective impact without staining.
Implementation Method 1
When the face of the suction cup struck a hard, flat object, the concave face of the suction cup would partially flatten and the rubber would seal against the impacted surface
Implementation Method 2
The pressure inside the suction cup would, therefore, be lower than the air pressure surrounding the suction cup and the suction cup would adhere to the impacted surface
Implementation Method 3
The foam used in the suction cup head has an open cell density within the foam of between five percent and twenty percent
Data Source
AI summary
A projectile device having a suction cup head made of a novel foam. The foam used in the suction cup head has an open cell density within the foam of between five percent and twenty percent. The suction cup head has a face surface of a first diameter. A shallow concavity is formed in the face surface. The concavity has nearly the same diameter as the face surface, however, the depth of the concavity is no more than one-tenth of that diameter. Furthermore, the face surface of the suction cup head is proportionally large, being at least twenty-five percent as wide as the entire projectile device is long. The combination of a large suction cup head, a shallow concavity and a soft, semiporous foam enables the suction cup head to adhere to both smooth surfaces and rough surfaces.