Universal Swimming Pool Main Drain Adaptor for Rusted Screw Removal
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Solution Overview
Problem
Existing main drain covers in swimming pools, spas, and ponds often become difficult or impossible to secure due to rusted screws and mismatched screw patterns, posing a hazardous condition as they fail to comply with safety standards and cannot be easily replaced.
Innovation Solution
A universal swimming pool main drain adaptor featuring a plastic trim ring with cardinal point slots and a perpendicular mounting ring with thumb-style screws, allowing secure attachment of main drain covers without relying on existing screw holes, accommodating various screw spacings and patterns, and enabling easy installation on uneven surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard mounting screws are used to attach main drain covers, then the covers can be securely fastened, but the screws become compromised by rust and cannot be removed or replaced
Solution Approach 1:
The patent introduces an intermediary adapter assembly that sits between the main drain body and the main drain cover. This adapter has threaded holes that receive mounting screws, allowing the screws to be attached to the adapter rather than directly to the main drain body. This intermediary structure enables easy removal and replacement of both the adapter and cover without damaging the main drain body, resolving the rust and removal difficulty problems while maintaining secure mounting.
2Reliability
If newer main drain covers with different screw patterns are installed, then safety compliance is improved, but compatibility with older main drain pots is lost
Solution Approach 1:
The adapter assembly is designed with universal adaptability to work with both older and newer main drain covers. The adapter body can be secured to various main drain pot configurations, and the top surface provides a standardized mounting interface that accommodates different screw patterns. This multi-functional design allows the same adapter to bridge compatibility gaps between different cover types and main drain pots, enabling safety compliance while maintaining versatility.
3Ease of operation
If existing screw holes in the main drain pot are used for mounting, then installation is simplified, but the holes become blocked by rusted screw remains
Solution Approach 1:
The adapter assembly extracts the mounting function from the main drain pot's existing screw holes. Instead of relying on the potentially blocked holes in the main drain body, the adapter creates its own independent threaded mounting holes in its own body. This separation allows the mounting screws to engage with the adapter's fresh, unblocked threads rather than the rusted remains in the original screw holes, ensuring reliable attachment while maintaining installation simplicity.
Data Source
AI summary
A transitional mounting adaptor to connect a pool main drain to a pool main drain cover with or without water in the pool. The adaptor consists of a trim ring with four cardinal point screw slots (NSEW) molded to a perpendicular mounting ring with three equally spaced, threaded pointed thumb screws, passing perpendicularly thru the mounting ring, via a series of threaded mounting holes, creating three pressure points which secures the adaptor to the main drain pot. The cardinal point screw slots in any position will receive coarse thread main drain screws used for mounting a main drain cover onto the trim ring. Further, the edge of the trim ring is bull-nosed. The cardinal point screw slots of the trim ring can also be used to mechanically fasten the adaptor to a main drain pot. The adaptor allows water to pass thru the trim ring, thru the mounting ring, and continue thru the main drain, as with the normal functioning of pool water flow.