Threaded Height-Adjustable Manhole Cover for Road Alignment
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Solution Overview
Problem
Existing manhole covers lack a mechanism for efficient height adjustment relative to the driving surface, leading to potential accidents from uneven road surfaces, and require costly and inefficient maintenance due to frictional sticking.
Innovation Solution
A height adjustable manhole cover design featuring an inner and outer threaded unit with cleats for rotation and grease fittings to lubricate the threaded connection, allowing for easy height adjustment and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fixed-height manhole cover is used, then the structure is simple and stable, but the road surface becomes uneven and accident-prone when height adjustment is needed
Solution Approach 1:
The patent implements nesting by placing the inner threaded unit inside the outer threaded unit, with the inner unit containing the manhole cover and the outer unit providing the adjustment mechanism. This nested configuration allows height adjustment functionality to be integrated within the existing manhole cover structure without requiring separate external components, thus improving road surface safety while minimizing structural complexity
Solution Approach 2:
The patent applies dynamics by enabling the manhole cover height to be adjusted from a fixed state to a variable state through the threaded connection mechanism. The inner and outer threaded units allow rotational movement that translates to vertical height adjustment, making the structure dynamic and adaptable to different road surface conditions, thereby improving safety without excessive complexity
2Reliability
If height adjustment mechanism is added to manhole cover, then road surface evenness is improved, but friction causes sticking and requires frequent maintenance
Solution Approach 1:
The patent introduces grease fittings as intermediary elements that deliver lubricant to the threaded connection between inner and outer units. This lubrication intermediary reduces friction and prevents sticking, ensuring smooth height adjustment operation and reducing maintenance frequency, thus improving ease of repair while maintaining road surface evenness
Solution Approach 2:
The grease fittings enable the threaded mechanism to self-lubricate, allowing the system to maintain its own functionality without external intervention. By providing a means for the mechanism to service itself through lubrication, the patent reduces maintenance requirements and prevents sticking, improving ease of repair while preserving the height adjustment capability
3Manufacturing precision
If threaded connection is used for height adjustment, then adjustment precision is improved, but the mechanism becomes costly to manufacture
Solution Approach 1:
The patent segments the height adjustment mechanism into two separate threaded units (inner and outer) with distinct functions. The inner unit provides precise height adjustment through its threaded connection, while the outer unit provides structural support and rotation. This segmentation allows each component to be manufactured independently using standard threading processes, reducing overall manufacturing cost while maintaining adjustment precision
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 design provides a safe, economical, and low-maintenance solution for aligning the manhole lid with the road surface, preventing accidents and minimizing sticking issues.
Implementation Method 1
comprising of an outer tubular unit with a threaded interior wall, an inner tubular unit with a threaded exterior wall and manhole cover, where in the tubular units are threadably connected
Implementation Method 2
provide a plurality of grease fittings to provide a means of lubricating the threated area of the assembly to prevent the inner threaded unit and the outer threaded unit become stuck
Data Source
AI summary
A height adjustable manhole cover including an outer unit assembly, an inner unit assembly. The inner unit assembly is secure on top of a concrete manhole unit by means of a flange under a driving road surface. The inner unit assembly further includes on top an external threaded area. The outer unit assembly includes an internal threaded area on bottom thereof. The outer unit assembly supports a manhole cover. The outer unit assembly is surrounded by means of a base course under the asphalt. The outer assembly includes cleats formed about the top of the outer assembly. A user would then interact with the cleats to rotate the outer unit assembly to a desired orientation to adjust the height thereof, therefore, the manhole cover can be adjacent to the driving road surface.