Appliance Door Latch Assembly With Flexible Circuit Wiring
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Solution Overview
Problem
Current electromechanical latches in cooking appliances face challenges such as complex and time-consuming assembly processes, high labor costs due to multiple wire connections, and susceptibility to assembly errors and electromagnetic interference, which can lead to unsafe operating conditions.
Innovation Solution
The introduction of a latching apparatus with a flexible printed circuit connecting all sensor switch terminals and motor terminals, utilizing a single point power connector integrated into the motor, and a simplified mechanical design that reduces the number of connection points, thereby streamlining the assembly process and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple wire connection terminals are used on the latch assembly, then the electrical connections can be established, but the assembly time and labor costs increase significantly
Solution Approach 1:
The patent combines multiple wire connection terminals into a single integrated connector assembly. The connector includes multiple terminals housed in a single body that interfaces with the latch assembly as one unit, eliminating the need for separate connection operations for each terminal. This merging reduces assembly time while maintaining reliable electrical connections for the motor, switches, and sensors.
Solution Approach 2:
The single connector assembly serves multiple functions simultaneously: it provides electrical connections for the motor, door switch, cam switch, and various sensors through integrated terminals. This multi-functional connector eliminates the need for separate connectors for each component, streamlining the assembly process while ensuring all electrical connections are established reliably.
2Reliability
If multiple wire connection terminals are used on the latch assembly, then the electrical connections can be established, but the complexity of wiring increases
Solution Approach 1:
The patent merges multiple separate wire connections into a single integrated connector assembly. All electrical connections for the motor, switches, and sensors are consolidated into one connector interface, dramatically reducing wiring complexity while maintaining the necessary electrical pathways for reliable operation.
Solution Approach 2:
The connector assembly is segmented into multiple terminals within a single housing, each terminal dedicated to a specific electrical connection. This segmentation allows for organized, systematic wiring while presenting a unified interface that simplifies the overall wiring process compared to multiple separate connectors.
3Reliability
If multiple wire connection terminals are used on the latch assembly, then the electrical connections can be established, but the opportunity for connection errors increases
Solution Approach 1:
By combining all wire connections into a single integrated connector assembly, the patent reduces the number of separate connection operations required. This merging minimizes the opportunities for human error in connecting wires to the correct terminals, as the integrated design guides proper connection establishment in a single operation rather than multiple separate steps.
4Reliability
If conventional electromechanical latches are used with multiple connectors, then the electrical connections can be made, but repetitive motion injuries to assembly workers occur
Solution Approach 1:
The patent merges multiple separate connector installations into a single connector assembly installation. This reduces the repetitive hand motions and manual manipulation required during assembly, thereby minimizing the risk of repetitive motion injuries to assembly workers while still establishing all necessary reliable electrical connections.
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
This solution significantly reduces assembly time and errors, improves operational performance, and enhances safety by eliminating the risk of incorrect wire connections and electromagnetic interference, while also reducing labor costs and repetitive motion injuries.
Implementation Method 1
The electrical switch and the electrical motor are electrically connected to each other through a flexible printed circuit which connects the electrical switch to a single point power connector
Implementation Method 2
Electro-mechanical latches are typically powered by an electric synchronous gear motor which actuates the latch linkage and rotates a cam
Data Source
AI summary
A latching assembly uses a flat sheet metal chassis with electrical switches, an electrical motor driving a cam, a push rod, a hook, a spring, and various actuators/levers. When a first actuator/lever is moved by an outside force, a circuit connection may be opened or closed depending upon the configuration of the electro-mechanical system. This will generate a signal which will allow current to flow to a motor. The motor will, in turn, drive the cam which will push a second actuator/lever to move and cause a hook to move from a first, non-latching position to a second, latching position. The assembly is useful for latching an oven or other appliance door when operating at high temperature.