Latch Mechanism for Front Opening Lid with High Clearance
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Solution Overview
Problem
Conventional latches for front-opening lids have low ground clearance, making it difficult for users wearing gloves to open them, and require high precision manufacturing due to elastically biased engaging structures that are prone to stress.
Innovation Solution
A latch design with sufficient ground clearance and an elastically biased handle that rotates away from the lid, featuring a hook and pin mechanism allowing easy unlocking, reducing the need for precise manufacturing and minimizing wear on the latch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional latch structure with low ground clearance is used, then the latch mechanism is compact, but users wearing gloves cannot easily open the latch
Solution Approach 1:
The latch mechanism is repositioned from a low-clearance configuration to a high-clearance configuration by mounting it on the interior surface of the lid rather than the exterior. This dimensional change in positioning provides sufficient ground clearance for users wearing gloves to easily access and operate the latch handle without scraping their hands against the ground.
2Reliability
If elastically biased engaging structure with hooks is used, then the latch maintains locked position, but high precision manufacturing is required to align engaging structure and handle
Solution Approach 1:
The patent separates the elastic biasing function from the engaging structure. Instead of having hooks or engaging means on the handle that are themselves elastically biased, the patent uses a distinct spring member that biases the handle toward the locked position. This extraction of the biasing function into a separate component eliminates the need for high-precision alignment between the engaging structure and handle, as the spring independently provides the necessary force.
Solution Approach 2:
The latch mechanism is divided into distinct functional segments: the handle, the engaging structure (hook), and a separate spring member for elastic biasing. This segmentation allows each component to be manufactured independently with standard tolerances, and then assembled together without requiring high-precision alignment, while still maintaining reliable locked position through the coordinated action of these segmented components.
3Reliability
If engaging structure is elastically biased, then the latch remains locked, but the engaging structure is constantly subjected to stress and wear
Solution Approach 1:
The patent extracts the elastic biasing function from the engaging structure (hook) and places it in a separate spring member. The engaging structure itself is no longer elastically biased, so it is not constantly subjected to stress. Instead, the spring member applies force to the handle to maintain engagement, while the hook itself remains a passive, stress-free component that simply provides the mechanical interlock when engaged.
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 users wearing gloves to easily unlock the latch and reduces manufacturing complexity by eliminating the need for high precision in the attachment member, while maintaining effective coupling of the lid to the case.
Implementation Method 1
the handle being biased to a latched position to engage the retaining member against the pin
Data Source
AI summary
A latch with a handle that is elastically biased in the closed position. The latch is attached to the lid via a handle, and when the handle is disengaged from the lid, the latch can be rotated away from the lid. Upon rotating the latch away from the lid, hooks on the latch will disengage with a receiving portion of a case, thereby allowing the lid to be removed from the case.