Door hinge for a laundry appliance having a sheet metal hinge and an integrated rotation limiting device
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Solution Overview
Problem
Laundry appliance doors face challenges in maintaining a robust and reliable rotational mechanism that prevents over-rotation and sagging, especially under load and repeated use, due to existing hinge designs that lack effective stop mechanisms and secure attachment methods.
Innovation Solution
A sheet metal hinge with a cabinet mount and integral stop mechanism, featuring a hinge pin with a protrusion that engages a stop on the cabinet mount, and a sheet metal flange press-fit onto the hinge pin, secured via fasteners, along with a bushing and cam member configuration to define the open position and prevent eccentric forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional hinge design is used, then the door can rotate freely, but the door experiences over-rotation and sagging under load
Solution Approach 1:
The hinge incorporates a stop mechanism that preemptively prevents over-rotation of the door by providing a physical barrier before excessive rotation can occur. This preliminary counter-action ensures the door maintains proper alignment and prevents sagging without restricting normal operational movement.
Solution Approach 2:
The hinge design includes pre-positioned stops and support structures that are already in place to counteract gravitational forces and prevent door sagging before it occurs. The stop mechanism is预先 configured to engage at the correct rotation angle, maintaining door stability throughout operation.
2Reliability
If a robust hinge mechanism is implemented to prevent door sagging, then door stability improves, but the hinge structure becomes more complex
Solution Approach 1:
The hinge design combines multiple functions into a single integrated structure. The stop mechanism, support bearing, and attachment features are merged into one cohesive hinge assembly, providing robust door stability without requiring multiple separate components. This integration maintains reliability while minimizing structural complexity.
Solution Approach 2:
The hinge components are designed to perform multiple functions simultaneously. The stop serves both as a rotation limiter and a structural support element, while the sheet metal flange provides both attachment and positioning functions. This multi-functionality reduces the number of parts needed while maintaining door attachment reliability.
3Strength
If a sheet metal flange with fasteners is used to secure the hinge, then attachment strength increases, but manufacturing complexity increases
Solution Approach 1:
The hinge attachment system is divided into modular components: the sheet metal flange, fasteners, and support bearing are separate but easily assembled parts. This segmentation allows each component to be manufactured independently using standard processes, then quickly assembled on the production line, maintaining both strength and manufacturing ease.
Solution Approach 2:
The sheet metal flange utilizes material property changes through forming and shaping operations during manufacturing. The metal is cold-formed into the required geometry with integrated fastener holes, transforming a simple flat sheet into a structurally optimized attachment component without requiring complex multi-step manufacturing processes.
Data Source
AI summary
An appliance includes an outer cabinet having a front aperture for accessing a processing space. A door selectively engages the front aperture in a closed position to enclose the processing space. A hinge includes a cabinet mount attached to the outer cabinet and having a stop that defines an open position of the door. A hinge pin extends through the cabinet mount to define a rotational axis of the hinge. A sheet metal flange is press fit onto the hinge pin and is fixedly attached to the door. The sheet metal flange is wrapped around the hinge pin and is attached to the door via fasteners. The pin includes a protrusion that selectively engages the stop of the cabinet mount in the open position.