Subgrade Vault Cover Latching Mechanism for Water Displacement
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Solution Overview
Problem
Subgrade vault covers are prone to displacement by water flow, leading to potential accidents due to their low specific gravity and lack of reliable closure mechanisms, which can result in injuries from hidden access ports.
Innovation Solution
A subgrade vault design featuring a spring-loaded latch assembly with a deflective cam surface and tool-operated retraction mechanism ensures the cover is securely locked and easily removable without specialized tools, ensuring correct alignment and secure closure with minimal effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cover is made of high density polyethylene to blend with surroundings, then the aesthetic appearance is improved, but the cover becomes susceptible to displacement by water flow due to low specific gravity
Solution Approach 1:
The cover is divided into two functional parts: the cover body made of aesthetically pleasing high density polyethylene that blends with surroundings, and a separate latching mechanism made of stronger material that provides secure attachment. This segmentation allows each part to optimize its specific function without compromise.
Solution Approach 2:
The latching mechanism is pre-positioned on the cover body during manufacturing, creating a permanent attachment feature that eliminates the need for separate installation steps. The latch protrudes beyond the cover perimeter, ensuring immediate engagement with the vault structure when the cover is placed.
2Reliability
If a secure latching mechanism is added to prevent cover displacement, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The latching function is extracted as a distinct, simple protruding element from the cover body, rather than integrating a complex multi-component locking system. This separate latch can be engaged and disengaged independently, simplifying the overall mechanism while maintaining secure closure.
Solution Approach 2:
The latching mechanism is designed to be self-latching through the protruding latch geometry that naturally engages with the vault structure upon cover placement. No additional tools, keys, or complex actuation mechanisms are required - the simple downward force of placing the cover automatically secures it.
3Ease of manufacture
If the latching mechanism is entirely within the cover envelope, then the aesthetic appearance is improved, but the ease of operation for tool access is reduced
Solution Approach 1:
The latch protrudes beyond the cover perimeter in a third dimension, creating an accessible interface for tool engagement without compromising the top-down aesthetic appearance. This vertical extension allows maintenance personnel to access the latch from above using common tools while the cover maintains its clean, blended appearance when closed.
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 provides a reliable and user-friendly mechanism for securing and opening the vault cover, preventing accidental displacement and enhancing safety by ensuring the cover is securely locked and easily accessible for maintenance, reducing the risk of injuries and facilitating maintenance operations.
Implementation Method 1
a bias spring will extend the latch pin to its locked position
Implementation Method 2
A deflector cam surface on the pin is engageable to the ledge to retract the latch pin while the cover is pressed into place
Implementation Method 3
A retraction cam surface is also formed in the latch pin. It is disposed at an angle such that an appropriate downward push on it will shift the latch pin inwardly to retract it from the latch surface
Data Source
AI summary
A subgrade vault with a latching cover. The vault includes a peripheral wall with an open access port at the top. A peripheral ledge surrounds the access port. A cover to close the access port fits inside it, with a latch assembly inside it and a retractable latch pin disposed to fit in an aperture in the peripheral ledge. The latch pin is retractable by the stabbing motion of a tapered tool against a cam surface on the latch pin. The cover is locked in place merely by pressing down on it.