Push-to-Open Oven Latch with Integrated Self-Cleaning Lock
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Solution Overview
Problem
Self-cleaning ovens with push-to-open latches require a separate latching device for the self-clean function, posing a risk to users due to high temperatures and lack of integrated safety locking during the self-cleaning cycle.
Innovation Solution
A push-to-open/signal-to-open latching and integrated locking system that includes a rotating cam, latching finger, and solenoid mechanism, allowing the oven door to be securely locked during self-cleaning and automatically released when safe, eliminating the need for a separate latching device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate latching device is added for self-cleaning function, then user safety during self-cleaning is improved, but device complexity increases
Solution Approach 1:
The patent combines the self-cleaning latch and the push-to-open latch into a single integrated latching device. The self-cleaning latch includes a cam mechanism that rotates to engage or disengage the latch finger with the latch slot, while the push-to-open latch uses the same latch finger and slot but actuated by door pushing force. This merging eliminates the need for separate latching devices, reducing complexity while maintaining safety functionality during self-cleaning operations.
Solution Approach 2:
The integrated latching device performs multiple functions: it acts as a self-cleaning latch when the cam is in the engaged position (preventing door opening during high-temperature cleaning), and as a push-to-open latch when the cam is in the disengaged position (allowing normal door operation). The same mechanical components (latch finger, latch slot, cam) serve both functions, making the device universal and eliminating redundancy.
2Shape
If push-to-open latch is used to eliminate handle, then design aesthetics and smooth surfaces are improved, but ease of operation deteriorates
Solution Approach 1:
The patent introduces a cam as an intermediary mechanism between the user's pushing action and the latch release. When the user pushes the door, the force is transmitted through the pawl to rotate the cam, which then moves the latch finger out of the latch slot to release the door. This intermediary cam mechanism allows the smooth door surface design to be maintained while providing adequate mechanical advantage for easy door opening operation.
3Reliability
If integrated locking device is implemented, then device complexity increases, but reliability of locking during self-cleaning improves
Solution Approach 1:
The integrated latching device incorporates a spring-loaded latch finger that automatically engages with the latch slot when the cam is in the locked position. The spring provides continuous engagement force, ensuring the door remains securely locked during self-cleaning operations without requiring additional active locking components. The system serves itself by using the existing cam and latch finger geometry to provide both normal operation and secure locking functionality.
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 system ensures user safety by preventing door opening during self-cleaning and cooling, integrating locking functionality within the push-to-open mechanism, enhancing safety and design aesthetics by eliminating the need for a separate handle.
Implementation Method 1
a solenoid mechanism
Implementation Method 2
a rotating cam having an exterior surface connected to the latch mounting bracket and rotatable with respect to the latching mounting bracket
Data Source
AI summary
Provided is a push-to-open latch for an oven appliance and other household appliances. The push-to-open latch includes an integrated locking device for locking an appliance door in place and initiate a downstream appliance function such as a self-cleaning function. The integrated locking device includes a rotating cam having a latching slot which engages a pawl. The rotating cam also includes a guiding ramp and a catch surface which may be used to engage a latching finger to lock the cam in place. In addition, the locking device may include a locking slide and a locking slide pin that is actuated by a solenoid to engage the cam. Once the appliance door is locked, one or more switches send a signal to the appliance controller to activate the downstream function.