Manhole Cover Kit With Removable Threaded Tabs
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Solution Overview
Problem
Current manhole cover and ring systems face issues with stripped or seized threaded devices, leading to damage when attempting to detach the manhole cover, requiring costly and resource-intensive repairs to the cover, ring, and surrounding area.
Innovation Solution
A kit of parts comprising a manhole cover, ring, and threaded tabs that allow for easy detachment and replacement without damaging the manhole cover or ring, using apertures and chambers to secure the cover to the ring via removable threaded devices and tabs, eliminating the need for embedded threading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded devices are embedded in the manhole cover and ring to secure them together, then the manhole cover can be firmly attached to the ring, but the threaded devices may become stripped or seized, requiring damage to the cover, ring, or surrounding area for removal
Solution Approach 1:
The system divides the attachment mechanism into separate components: the manhole cover and ring remain intact, while removable threaded tabs with threaded devices provide the attachment function. This segmentation allows the threaded components to be replaced independently without damaging the main structures.
Solution Approach 2:
Threaded tabs serve as intermediary components between the manhole cover and ring. These tabs receive the threaded devices and provide a replaceable interface, preventing direct engagement between the cover and ring that would require damage for removal.
2Reliability
If threaded devices are used to attach the manhole cover to the ring, then secure attachment is achieved, but costly and resource-intensive repairs are required when the threaded devices become damaged
Solution Approach 1:
The threaded tabs are designed as replaceable, lower-cost components that can be easily replaced when damaged. This is more economical than repairing or replacing the entire manhole cover or ring assembly, reducing maintenance costs and resource usage.
Solution Approach 2:
When threaded devices or tabs become damaged, they are discarded and replaced with new components. The main manhole cover and ring structures are preserved and reused, recovering the value of the primary components while replacing only the wear-prone elements.
3Stability of the object's composition
If embedded threading is used in the manhole cover and ring, then permanent attachment is achieved, but damage occurs to the surrounding area when removal is necessary
Solution Approach 1:
The threaded attachment mechanism is extracted from the manhole cover and ring structures and placed in separate removable tabs. This extraction prevents damage to the cover, ring, and surrounding area during removal, as the tabs can be taken out without affecting the main structures.
Data Source
AI summary
A kit of parts and apparatus for covering a manhole having a manhole cover defining one or more apertures therethrough, a ring defining, on the bottom thereof, one or more chambers, the ring further defining one or more apertures therethrough wherein the ring defines each of the one or more apertures therethrough within each of one or more chambers and one or more tabs such that each of the one or more tabs is housed within each of the one or more chambers defined by the ring, each of the one or more tabs slidably engages with the ring, each of the one or more tabs defining, on an end thereof, a threaded aperture therethrough for engaging a threaded device and, on an end thereof, an indention for engaging a flat-headed tool.