Manhole Cover Blocking Element Radial Foot Design
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Solution Overview
Problem
Manhole covers lack effective security measures against theft, as existing blocking elements are not sufficiently deterrent or difficult to integrate without significant modifications.
Innovation Solution
The blocking element of the manhole is redesigned with a foot directed radially outward, extending outside the frame, and coated with sealing material, featuring a projection and housing mechanism to prevent disengagement of the cover element from the frame knuckle, enhancing security without requiring frame modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the foot of the blocking element is directed radially inwards (prior art), then the blocking element can be integrated within the frame structure, but the security against theft is insufficient
Solution Approach 1:
The foot of the blocking element is directed radially outwards instead of radially inwards as in prior art. This inversion allows the foot to extend outside the frame, creating a deterrent against theft by making removal more difficult while maintaining simple integration with the frame structure through the outward-facing configuration
2Reliability
If the blocking element is made more secure against theft, then security improves, but the ease of manufacture and integration deteriorates
Solution Approach 1:
The blocking element is designed with a base body that can be universally integrated into the frame structure through simple positioning features. The outward-directed foot serves multiple functions: it extends beyond the frame to deter theft, it can be coated with sealing material to prevent water ingress, and it maintains compatibility with existing frame designs without requiring complex modifications
3Reliability
If the foot extends outside the frame, then security against theft increases, but the sealing requirements and complexity increase
Solution Approach 1:
The foot is designed with a specific geometry that allows it to extend radially outwards from the frame. This parameter change in the foot's orientation and extension enables it to protrude beyond the frame's outer surface, creating a physical deterrent against theft while maintaining a simple geometric form that does not significantly increase sealing complexity
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a manhole cover (2) that comprises a frame (4) defining a frame central axis (X-X) and provided with a frame knuckle (26), and a frame covering member (6) provided with a covering member knuckle (28), the knuckles being adapted so as to allow the pivoting of the covering member (6) relative to the frame (4) into a disengagement position, the frame knuckle (26) and the covering member knuckle (28) being adapted to be disengaged from each other when the covering member (6) is in the disengagement position. The manhole cover of the invention includes a member for blocking the knuckle disengagement, wherein the blocking member includes a base body (42) and a leg (44). The leg (44) is oriented radially towards the outside relative to the frame central axis (X-X).