Self-latching Locking Assembly for Enclosure Lids
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Solution Overview
Problem
Existing locking systems for enclosures require special tools to secure the lid, which can be inconvenient and inefficient.
Innovation Solution
A self-latching locking assembly that uses a spring-biased latch and L-bolt mechanism, allowing the lid to be locked securely with foot pressure without the need for tools, by engaging a locking surface inside the enclosure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional locking system is used, then the lid can be securely locked, but special tools are required to operate the locking mechanism
Solution Approach 1:
The locking assembly is designed to be self-latching through a spring-biased latch mechanism that automatically engages with the locking surface when the lid is closed, eliminating the need for external tools to secure the lid. The system serves itself by using the closing motion to trigger the locking action.
Solution Approach 2:
The L-bolt mechanism allows dynamic transition between locked and unlocked states through rotation, enabling the latch to move between engaged and disengaged positions. The spring-biased latch provides dynamic response to the closing force, automatically transitioning to the locked state.
2Ease of operation
If a tool-free locking mechanism is used, then convenience is improved, but the security and reliability of the lock may be compromised
Solution Approach 1:
The L-bolt uses a curved or angled geometry to transform the simple downward closing motion into rotational movement that engages the latch. This geometric transformation ensures reliable engagement while maintaining tool-free operation, as the curvature guides the bolt into the locked position automatically.
Solution Approach 2:
The locking and latching functions are merged into a single integrated mechanism where the L-bolt rotation simultaneously controls both the latch position and the engagement with the locking surface. This consolidation ensures that the same motion that closes the lid also secures it, maintaining security without requiring separate tool operations.
3Extent of automation
If a spring-biased latch mechanism is used, then automatic latching is achieved, but the device complexity increases
Solution Approach 1:
The spring-biased latch mechanism serves multiple functions: it provides the locking force, guides the engagement motion, and ensures positive latching. The L-bolt simultaneously controls the latch position and engages with the locking surface. By making these components multi-functional, the patent reduces the need for separate dedicated parts for each function.
Solution Approach 2:
The L-bolt acts as an intermediary element that translates the simple downward closing motion into the complex sequence of latch retraction and engagement. It mediates between the user's closing action and the spring-biased latch mechanism, converting linear motion into rotational motion that triggers the automatic latching sequence.
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
Enables secure, tool-free locking and unlocking of enclosures, improving convenience and accessibility while maintaining security.
Implementation Method 1
A spring-biased latch that engages a locking surface on the interior of the enclosure
Implementation Method 2
The latch retracts against the spring-bias as it travels over the lip or abutment and then snaps into engagement with a locking surface
Data Source
Figure 1
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Figure 3
AI summary
A locking system for securely closing the lid (22) on an enclosure, such as a grade level box, includes an L-bolt (52) connected to a spring-biased slide member (26) positioned on the underside of the lid (22). The L-bolt (52) rotates in a slotted housing that securely retains the L-bolt (52) under the lid. The slide member engages an abutment on the inside of the enclosure, when the lid (22) is forced down over an opening in the enclosure, e.g., by foot pressure. Downward force on the lid 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. The L-bolt (52) is accessed from outside the lid (22), rotated by a proprietary socket wrench or similar tool, to retract the latch from its locking position sufficiently for removing the lid from the enclosure.