Hinge Assembly with Step Feature to Prevent Inadvertent Door Closure
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Solution Overview
Problem
Existing hinge assemblies for home appliances, such as cooking ovens, do not adequately prevent the door from inadvertently closing on users after being opened, potentially causing safety hazards.
Innovation Solution
A hinge assembly design that includes a first and second hinge plate with a step configuration, where the second hinge plate travels downward when the door is opened, disengaging from the first hinge plate, and requires a vertical force to re-engage and close the door, thereby inhibiting accidental closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional hinge assembly is used, then the door can close freely and easily, but the door may inadvertently close on users causing safety hazards
Solution Approach 1:
The hinge assembly incorporates a step feature that creates a mechanical barrier preventing the door from closing unless a deliberate upward lifting force is applied. This preliminary anti-action mechanism counteracts the natural closing motion, requiring the user to first lift the door against the step before it can close, thereby preventing inadvertent closure while maintaining controlled operation
Solution Approach 2:
The hinge assembly introduces a vertical dimension to the door closing operation. Instead of purely horizontal movement, the door must now undergo vertical displacement (lifting) before closing can occur. This dimensional change transforms the closing action from a simple horizontal motion to a compound motion requiring vertical force application, enhancing safety without significantly complicating the operation
2Reliability
If a step configuration is added to the hinge plates, then accidental door closure is prevented, but the hinge assembly structure becomes more complex
Solution Approach 1:
The hinge assembly is divided into two separate hinge plates (first and second hinge plates) with complementary features. The step is formed on one plate while the corresponding engagement surface is formed on the other plate. This segmentation allows the safety function to be distributed across multiple components, making the overall system more manageable and easier to manufacture despite the added complexity
Solution Approach 2:
The safety step feature is integrated directly into the hinge plate structure rather than being a separate component. The step and engagement surfaces are formed as part of the hinge plates themselves, merging the safety mechanism with the structural elements. This integration reduces the total number of parts and simplifies assembly while maintaining the safety function
Data Source
AI summary
A hinge assembly for moveably coupling a door with a cabinet of a home appliance includes a first hinge plate coupled with the cabinet and a second hinge plate coupled with the door and moveable relative to the first hinge plate about a pivot pin. One of the first hinge plate and the second hinge plate includes a step vertically offset from a body of the hinge plate. When the door is moved into the open position, the second hinge plate travels downward relative to the first hinge plate due to the step. The step is configured to inhibit movement of the door to the closed position until a vertical force is applied to lift the second hinge plate relative to the first hinge plate into a closed position.