Shielded Self-Latching Vault Lock for Tool-Free Electrical Isolation
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Solution Overview
Problem
Existing locking systems for enclosures like grade level boxes do not adequately prevent conductive contact, which can lead to electrical shock during installation or unintentional contact, and require tools for locking, making them inconvenient and unsafe.
Innovation Solution
A shielded self-latching locking assembly that uses a spring-biased latch and L-bolt mechanism, accessible from outside, which locks the lid with foot pressure without tools and is designed to prevent conductive contact by covering all conductive components with a shielded cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional locking system is used for enclosures, then the lid can be locked securely, but conductive contact between internal components and the locking assembly may occur, creating electrical shock hazards
Solution Approach 1:
A non-conductive shield is introduced as an intermediary component between the conductive locking assembly and the enclosure interior. This shield acts as a mediator that allows the locking function to be performed while simultaneously blocking electrical current paths, thus resolving the contradiction between locking security and electrical safety.
Solution Approach 2:
The locking assembly is segmented into separate functional components: the conductive locking mechanism and the non-conductive shield. This segmentation allows each component to perform its specific function independently - the locking mechanism provides security while the shield provides electrical isolation, eliminating the harmful conductive path.
2Reliability
If a tool-locked system is used, then the enclosure can be securely locked, but tools are required for locking and unlocking, reducing convenience and increasing installation time
Solution Approach 1:
The locking assembly is designed with a self-latching mechanism that automatically engages and locks the lid without requiring external tools. The system serves itself by using the downward force applied during lid installation to trigger the latching action, thereby providing both security and convenience simultaneously.
Solution Approach 2:
The locking mechanism is pre-configured with spring-loaded latches and positioning features that are ready to engage automatically when the lid is placed on the enclosure. This preliminary preparation allows the locking action to occur automatically during the normal lid installation process, eliminating the need for subsequent tool operation.
3Ease of operation
If a self-latching mechanism is used, then tool-free locking is achieved, but the mechanism may inadvertently engage or disengage during installation or use
Solution Approach 1:
The design incorporates preliminary anti-actions by positioning the latches and locking surfaces to engage in a controlled sequence during lid installation. The geometry of the locking surfaces and the spring forces are configured to prevent inadvertent engagement or disengagement, ensuring that the self-latching mechanism only activates through the intended downward lid installation force.
Solution Approach 2:
Instead of designing a mechanism that actively locks and requires active unlocking, the system is designed to passively engage through the natural installation motion and remain locked until a deliberate unlocking action is taken. This inversion of the active/passive locking roles enhances reliability by making accidental changes unlikely.
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 secure, tool-free locking of enclosures while preventing electrical shock by ensuring no conductive path between internal and external components, enhancing safety and convenience during installation and use.
Implementation Method 1
The locking assembly includes a spring-biased latch that engages a locking surface on the interior of the enclosure
Implementation Method 2
a cover that separates and covers the locking assembly from interior components within the enclosure
Data Source
AI summary
A shielded locking system for securely closing a lid on an enclosure, such as a grade level utility vault, including an L-bolt connected to a spring-biased slide member positioned on the underside of the lid that rotates in a slotted housing that securely retains the L-bolt under the lid, the slide member engaging an abutment on the inside of the enclosure when the lid is forced down over an opening in the enclosure by downward force on the lid which progressively causes the latch to retract against the spring-bias from contact with the abutment and then snaps the latch into a spring-biased locking position under the abutment, and a non-conductive cover positioned over and connected to the locking system to shield the L-bolt from electrical conductivity from within the enclosure.