Concealed Dryer Door Latch Switch for Contamination Protection
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Solution Overview
Problem
Modern appliances with lid or door switches are vulnerable to contamination and tampering, as the switch operator is exposed and can accumulate contaminants, leading to potential jamming and unauthorized operation.
Innovation Solution
A switch operator is hidden behind a conventional spring latch, featuring a latch switch assembly with movable jaw elements and a U-shaped metal clip for biasing, which reduces contamination and tampering risks while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the switch operator is exposed and extends from the housing to be activated by door closure, then the switch can be easily operated by the door, but the switch operator becomes vulnerable to contamination and tampering
Solution Approach 1:
The switch operator is nested within the latch mechanism housing, specifically positioned within the strike reception cavity. The operator is activated by the strike when the door closes, but remains hidden and protected from external contamination and tampering. This nesting arrangement allows the switch to be operated by the door mechanism while keeping the operator concealed and protected.
Solution Approach 2:
The strike acts as an intermediary element that transfers the door closure action to the switch operator. When the door closes, the strike is received by the latch mechanism and subsequently actuates the switch operator indirectly. This intermediary mechanism allows the switch to be operated by door closure while protecting the operator from direct exposure to contaminants and tampering.
2Object-affected harmful factors
If the switch operator is hidden behind the latch mechanism, then contamination and tampering are prevented, but the switch mechanism becomes more complex
Solution Approach 1:
The switch mechanism is merged with the latch mechanism by integrating the switch operator within the strike reception cavity of the latch housing. The switch operator shares the same space and activation path as the latch strike, eliminating the need for separate exposed operator components. This merging reduces overall complexity while achieving protection from contamination and tampering.
Solution Approach 2:
The latch mechanism housing serves multiple functions: it provides the latch strike reception function, houses the switch operator, and protects the operator from contamination and tampering. The strike reception cavity simultaneously acts as the activation mechanism for the switch and as a protective enclosure. This multi-functionality reduces the need for additional components and simplifies the overall structure.
3Object-affected harmful factors
If the switch operator is positioned behind the jaw elements, then the switch is protected from contamination, but the installation depth and size constraints increase
Solution Approach 1:
The switch operator is positioned in a different spatial dimension within the latch housing, specifically within the strike reception cavity that is accessible from the front but protects the operator. The operator is activated by the strike moving along the insertion axis, but the operator itself is positioned behind the jaw elements in the lateral dimension, achieving protection without significantly increasing installation depth.
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 solution effectively prevents contamination and tampering, ensuring reliable operation by hiding the switch operator and using a spring latch mechanism that maintains functionality even in the event of appliance fires, while reducing size constraints and installation depth.
Implementation Method 1
a spring element biasing the jaws toward each other so that they may separate to receive the latch strike
Implementation Method 2
The U-shaped metal clip may be attached to a housing supporting the spring element and electric switch at a center portion of the U-shape clip substantially midway between the arms
Data Source
AI summary
A latch switch assembly for an appliance or the like provides spring-loaded jaws to retain a latch strike when a door of the appliance is closed and a switch operator positioned behind spring-loaded jaws be activated by the latch strike when it is received.