Waterproofing Nail Cap Structure for Higher Tightening Pressure
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Solution Overview
Problem
Conventional nail waterproofing caps suffer from reduced tightening pressure, poor watertightness, limited size compatibility, and severe deformation, leading to rainwater infiltration and damage to building materials due to their flat design and soft rubber material.
Innovation Solution
A cap with a hard material body featuring a flat penetration portion and an inclined edge portion with a downward protrusion, providing a dual watertight structure through a combination of an outer and inner blocking wall, allowing for use with various nail sizes and minimizing deformation during nailing, manufactured via injection molding with connection necks for efficient packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a flat cylindrical shape with soft rubber material is used, then the cap can absorb shocks between the nail and building material, but the tightening pressure is reduced and watertightness is poor
Solution Approach 1:
The cap changes from a flat cylindrical shape to a curved dome shape. This curvature allows the cap to concentrate tightening pressure at specific points (the apex and equatorial region) while maintaining shock absorption capabilities through the elastic deformation of the curved surface during nailing.
Solution Approach 2:
The cap utilizes material elasticity and geometric curvature to transform the distribution of forces. The curved shape allows for controlled elastic deformation that maintains both shock absorption and tightening pressure, resolving the contradiction between softness and pressure concentration.
2Device complexity
If a flat cylindrical shape with pre-formed center insertion place is used, then the cap structure is simple, but it cannot be used for nails in diversity of sizes and the position for nailing is limited
Solution Approach 1:
The cap is designed with a universal dome shape that can accommodate nails of various sizes and insertion positions. The curved geometry and elastic material allow the cap to adapt to different nailing scenarios without requiring pre-formed insertion places, making it compatible with diverse building materials and nail types.
3Ease of manufacture
If soft rubber material is used, then the cap can be easily manufactured, but it experiences severe deformation after nailing causing damage to building material and rainwater infiltration
Solution Approach 1:
The dome shape provides structural strength while maintaining ease of manufacturing through injection molding. The curved geometry distributes stresses more effectively than flat surfaces, reducing severe deformation after nailing while preventing damage to building materials and maintaining watertightness.
4Device complexity
If the lower contact surface is flat, then the cap structure is simple, but the tightening pressure is reduced
Solution Approach 1:
The curved dome shape concentrates tightening pressure at the apex and equatorial region during nailing, providing sufficient tightening force to secure the cap to the building material while maintaining structural simplicity suitable for injection molding manufacturing.
Data Source
AI summary
According to an embodiment, a cap for waterproofing a nail comprises a cap body and a tightening protrusion. The cap body includes a flat penetration portion and an edge portion extending from the penetration portion and inclined downward. The cap body is formed of a hard material which may be penetrated by a nail. The tightening protrusion is spaced apart inward from an end of the edge portion by a predetermined distance and protruding downward from a lower surface of the cap body. A thickness of the tightening protrusion is smaller than a thickness of the edge portion.