Magnetic Sewer Cleanout Cap for Fast Underground Location
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Solution Overview
Problem
Existing sewer cleanout caps are difficult to locate underground due to magnet corrosion, damage from tools, and ineffective attachment methods, leading to wasted time and resources in excavation and replacement.
Innovation Solution
A polymer sewer cleanout cap with a centrally located magnet protected by a non-corrosive housing and secure adhesion, allowing for reliable and rapid location using sensing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnet is attached to the outside of a sewer cap using duct tape, then the cap becomes locatable by sensing equipment, but the magnet falls off due to tape decomposition and corrosion
Solution Approach 1:
The magnet is integrated directly into the sewer cap body as a unified structure, eliminating the need for separate attachment methods like duct tape. This merging of the magnet and cap ensures the magnet cannot fall off while maintaining locatability.
Solution Approach 2:
The patent uses a inexpensive polymer cap that can be easily replaced if damaged, rather than investing in a durable but complex attachment system. The entire cap assembly including the magnet is designed as a disposable unit that can be quickly replaced.
2Difficulty of detecting and measuring
If a magnet is exposed on the surface of the sewer cap, then it can be located by sensing equipment, but the magnet is damaged or knocked off by shovels and tools
Solution Approach 1:
The magnet is nested within a cavity or recess in the sewer cap body, positioned just below the outer surface. This nesting protects the magnet from direct contact with shovels and tools while keeping it close enough to the surface for sensing equipment to detect its magnetic field.
Solution Approach 2:
The sewer cap has different properties in different regions: the outer surface is hard and protective, while the region containing the magnet is designed with specific magnetic properties. The magnet is positioned in a localized area optimized for detection while being protected by the surrounding cap material.
3Difficulty of detecting and measuring
If a magnet is embedded in the middle of a polyurethane cover, then the cover is locatable, but the cover lacks threads and has limited ability to seal non-vertical pipes
Solution Approach 1:
The sewer cap is designed with universal features that allow it to function on both vertical and non-vertical pipes. The cap includes an adjustable seal mechanism and a threaded connection system that can accommodate various pipe orientations and types, making it versatile for different applications.
Solution Approach 2:
The seal mechanism includes movable or adjustable components that can adapt to different pipe angles and positions. The cap can be positioned and sealed at various orientations, providing dynamic adaptability rather than being fixed for vertical pipes only.
4Difficulty of detecting and measuring
If a magnet is placed offset from the center of the sewer cap, then it is easier to locate, but the location accuracy of the cap center is reduced
Solution Approach 1:
The magnet is intentionally positioned asymmetrically within the cap structure, specifically in the drive block area, to provide strong detectable signal while maintaining cap alignment. The asymmetric positioning is compensated for by corresponding asymmetric features in the drive mechanism that ensure the cap is installed and oriented correctly.
Solution Approach 2:
The drive block serves as an intermediary element between the offset magnet and the cap center. The drive block's geometry and positioning provide reference features that allow workers to locate the magnet and simultaneously determine the correct cap center position, reconciling the offset magnet location with accurate cap alignment.
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 solution significantly reduces the time and effort required to locate sewer cleanout caps, enhancing efficiency and reducing labor costs by ensuring the magnet remains functional and securely attached.
Implementation Method 1
a locatable sewer cleanout cap by duct taping a magnet on the outside of a sewer cap
Data Source
AI summary
A sewer cleanout cap characterized by reliable and rapid location underground thereby eliminating time wasted attempting to locate, dig for, repair, or replace standard cleanout caps. The cleanout cap comprises a generally disc shaped threaded cap body having a distal face and a central axis with a drive block extending proximally from a proximal face of the cap body. A first recess can extend into the cap body from the distal face, and a second recess can extend from the distal face into the drive block. A first magnet is generally aligned with the first axis and is fixed and sometimes sealed within the sewer cleanout cap. First magnet fixation approaches include securing the first magnet in a non-corrosive housing, molding the magnet into the cap, securing within in a first recess using friction or adhesives, securing it to a post, or securing the first magnet within deflectable prongs.