Magnetic Lid Switch Assembly for Tamper-Resistant Washer Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lid safety switches in washing machines can be easily overridden by small objects or children's fingers, leading to unsafe operation during spin and agitation cycles.
Innovation Solution
A magnetic lid switch assembly featuring a pair of magnetically actuated micro-switches connected in series, with actuators and magnets oriented to ensure the switches remain closed only when the lid is properly closed, eliminating the need for a conventional access hole and enhancing tamper resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional lid switch with an access hole is used, then the switch can be easily operated, but it can be easily overridden by small objects or fingers
Solution Approach 1:
The patent replaces the conventional mechanical lever-based switch actuation system with a magnetic field-based actuation system. The lid switch assembly includes a magnet mounted on the lid and a reed switch mounted on the cabinet, eliminating the need for a mechanical access hole and lever mechanism. This substitution provides tamper resistance while maintaining ease of operation through magnetic coupling.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the lid position and the switch actuation. Instead of direct mechanical contact through an access hole, the magnetic field couples the magnet on the lid to the reed switch on the cabinet, providing indirect actuation that prevents tampering while maintaining functional operation.
2Device complexity
If a mechanical lever switch with access hole is used, then the structure is simple, but safety is compromised due to easy override
Solution Approach 1:
The patent replaces the mechanical lever switch system with a magnetic field-based system consisting of a magnet and reed switch. This substitution eliminates the safety hazard of easy override by small objects or fingers while maintaining relatively simple device structure through the use of standard magnetic components.
3Ease of operation
If the lid switch is mounted with an access hole for the operating lever, then the switch can be actuated properly, but it allows insertion of objects to override the switch
Solution Approach 1:
The patent introduces a magnetic field as an intermediary between the lid and the switch actuation mechanism. The magnet on the lid and reed switch on the cabinet create a magnetic coupling that actuates the switch without requiring a physical access hole, thereby preventing insertion of objects to override the switch while maintaining proper actuation.
Solution Approach 2:
The patent replaces the mechanical access hole and lever actuation system with a magnetic field-based actuation system. This substitution eliminates the vulnerability to override by insertion objects while maintaining ease of operation through magnetic coupling between the lid-mounted magnet and cabinet-mounted reed switch.
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 magnetic lid switch assembly effectively prevents motor energization when the lid is open, enhancing safety and resistance to tampering by ensuring the motor remains de-energized unless the lid is securely closed, thus preventing accidental operation.
Implementation Method 1
a magnet mounted on the lid and a reed switch mounted on the cabinet. The lid switch assembly utilizes the magnetic field of the magnet to open or close an electrical circuit
Data Source
AI summary
A magnetic lid switch assembly includes a first magnetically actuated electrical switch that has a lever arm movable between a first position wherein the first switch is open and a second position wherein the first switch is closed. A second magnetically actuated electrical switch electrically is connected in series with the first switch. The second switch has a lever arm movable between a first position wherein the second switch is open and a second position wherein the second switch is closed. A first actuator is magnetically coupled to the first switch. The first actuator moves the lever arm of the first switch closing the first switch to enable the first switch to pass an electric current when the first actuator is positioned proximate the first switch. A second actuator is magnetically coupled to the second switch. The second actuator moves the lever arm of the second switch closing the second switch to enable the second switch to pass an electric current when the second actuator is positioned proximate the second switch.