Door assemblies for appliances
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Solution Overview
Problem
Oven appliances require a substantial amount of force to open the door due to the spring roller assembly, which can be difficult for users to manage, especially when disengaging the roller from the strike plate and breaking the seal between the gasket and the door.
Innovation Solution
A door assembly with a latch assembly and trigger mechanism that allows the latch to engage and disengage from a catch, reducing the force needed to open the door by using a linkage arm or flexible wire to compress the spring and move the latch along a vertical direction, thereby facilitating easier door operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring roller assembly is used to hold the door in the closed position, then the door seal reliability is improved, but the force required to open the door increases
Solution Approach 1:
The door assembly is segmented into multiple functional components: a latch assembly with latch member, a trigger mechanism, and a linkage arm. The latch member can be positioned in multiple states (engaged with strike plate, disengaged, or in transition), allowing the door opening process to occur in stages rather than requiring all force at once. This segmentation enables the user to first activate the trigger, which then progressively moves the latch through its travel distance to disengage from the strike plate.
Solution Approach 2:
The trigger mechanism performs a preliminary action by initially moving the latch member a first distance to disengage it from the strike plate before the door is fully opened. This preliminary disengagement reduces the subsequent force needed to break the gasket seal and fully open the door. The linkage arm stores energy and positions the latch in advance, so that when the trigger is activated, the latch is already partially prepared for release.
Solution Approach 3:
The linkage arm acts as an intermediary mechanism between the trigger and the latch member. When the trigger is moved, it doesn't directly move the latch member the full distance needed for disengagement; instead, the linkage arm translates and amplifies the trigger's movement into the appropriate latch movement. This intermediary mechanism distributes the force requirement over time and distance, making the door easier to open while maintaining reliable engagement when closed.
2Reliability
If the latch is held firmly against the strike plate, then the door remains securely closed, but the trigger mechanism becomes more complex
Solution Approach 1:
The trigger mechanism is merged with the handle assembly, combining two functions (door opening initiation and latch release) into a single integrated component. The trigger is positioned within or adjacent to the handle, allowing the user to activate the latch release as part of the natural door opening motion. This merging reduces the need for separate, complex release mechanisms while maintaining secure door closure during normal operation.
Solution Approach 2:
The spring-loaded latch member automatically engages with the strike plate when the door is closed, requiring no active intervention to maintain secure closure. The spring provides continuous force to ensure positive engagement. When opening, the trigger mechanism simply needs to overcome this spring force momentarily to disengage the latch, after which the door opens naturally. This self-service approach maintains reliability without requiring complex active locking systems.
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 door assembly significantly reduces the force required to move the door from a closed to an open position, enhancing user convenience and accessibility without compromising the seal or operation of the oven appliance.
Implementation Method 1
The spring roller assembly includes a spring
Data Source
AI summary
An appliance defining a vertical direction includes a door, a catch, and a door assembly. The door defines a cavity accessible through an opening. The catch may be spaced apart from the door along the vertical direction. The door assembly may include a latch assembly and a trigger. The latch assembly may include a latch movable along the vertical direction. The trigger may be coupled to the latch assembly. In addition, the trigger may be movable between a first position and a second position. When the trigger is in the first position, the latch may engage the catch. In contrast, when the trigger is in the second position, the latch may be spaced apart from the catch along the vertical direction.