Cooking Appliance Knob Interference Mechanism Against Accidental Ignition
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Solution Overview
Problem
Cooking appliance knobs can be inadvertently rotated, leading to abnormal operations and unintended ignition of heat sources due to insufficient rotational force requirements.
Innovation Solution
A knob apparatus with an interference member that increases the rotational force needed for operation, featuring a slider and guide groove system that requires a specific threshold force for initial rotation, preventing unintended operation and enhancing user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional knob apparatus is used, then the structure is simple and easy to operate, but the knob can be inadvertently rotated by operations not intended by the user leading to abnormal operation and unintended ignition
Solution Approach 1:
The knob apparatus transitions from a static structure to a dynamic one where the interference member (slider) moves between interfering and non-interfering positions. The slider is spring-loaded to automatically engage with the knob holder's protrusion during normal operation, creating a dynamic barrier that prevents unintended rotation while allowing intentional rotation when sufficient force is applied.
Solution Approach 2:
The interference member (slider) acts as an intermediary element between the knob and the knob holder. This intermediate component provides the additional rotational force requirement by mechanically interfering with the rotation path, thereby preventing unintended operation without requiring fundamental changes to the knob or holder structures.
2Object-affected harmful factors
If an interference member is added to increase rotational force requirement, then safety is improved by preventing abnormal operation, but the device complexity increases
Solution Approach 1:
The knob apparatus is segmented into distinct functional components: the knob, the knob holder, and the interference member (slider). This segmentation allows the interference function to be isolated in a separate, simple component that can be easily added or removed, minimizing overall device complexity while effectively addressing the harmful factor of unintended operation.
Solution Approach 2:
The interference member is designed with self-service characteristics through the spring mechanism that automatically positions the slider to interfere with rotation. The spring provides continuous force to maintain the interference position without requiring external control systems, complex actuation mechanisms, or user intervention, thereby limiting the increase in device complexity.
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 abnormal operations and ensures the user intentionally applies the necessary force for knob rotation, thereby preventing accidental ignition and enhancing safety by requiring a distinct rotating force for initial operation.
Implementation Method 1
an elastic member of which one side is coupled with the guide groove, and another side is coupled with the slider
Data Source
AI summary
The cooking appliance according to the disclosure includes a main body having at least one heat source, a valve that includes a valve shaft, and adjusts an amount of fuel supplied to the at least one heat source according to an opening degree or a closing degree of the valve, and a knob apparatus that is coupled with the valve shaft and is installed on the main body. The knob apparatus includes a knob holder mounted on the main body, a knob that is rotatively supported by the knob holder, and an interference member that varies a rotating force by which the knob is rotatable while being supported by the knob holder and while the knob is at a predetermined location.