Cooking Appliance Safety Timer With Heat-Based Auto Shutoff
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Solution Overview
Problem
Existing stove top timer devices are inadequate in addressing the fire risk from unattended cooking, as they rely on user-set fixed times, are not coordinated across multiple burners, and lack effective alerts for elderly or distracted users, with no automatic shutdown mechanism to prevent fires.
Innovation Solution
A safety timer device with electronic dials that wirelessly communicate with a wall-mounted timer and alarm unit, automatically setting and resetting cooking times based on heat settings, and featuring a remote alarm system that can be heard from a distance, with an ON/OFF mechanism to disconnect power if unattended cooking exceeds safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed time timer is used regardless of heat output, then the device complexity is reduced, but the reliability of fire prevention is worsened because inappropriate times are set for different cooking conditions
Solution Approach 1:
The timer automatically adjusts its duration based on the detected heat setting of the burner. Higher heat settings trigger shorter timer durations, while lower heat settings allow longer durations. This dynamic adaptation ensures appropriate monitoring times for different cooking conditions without requiring user intervention, resolving the contradiction between simple fixed-time mechanisms and reliable fire prevention.
Solution Approach 2:
The system automatically detects the heat setting and sets the appropriate timer duration without user input. The microcontroller reads the heat controller setting and autonomously determines the safe cooking period, eliminating the need for users to manually select timer modes and reducing errors from incorrect time selection.
2Adaptability or versatility
If multiple independent timer dials are used for each burner, then each burner can be monitored individually, but the device complexity increases and user annoyance increases due to multiple independent alarms
Solution Approach 1:
Multiple burner monitoring functions are merged into a single coordinated timer system. The microcontroller manages all burner timers centrally, allowing the system to monitor multiple burners simultaneously while coordinating alarm activation. This approach provides comprehensive multi-burner monitoring while avoiding the chaos of multiple independent alarms through centralized control logic.
Solution Approach 2:
The system continuously monitors the state of all burners and adjusts timer behavior based on real-time conditions. When multiple burners are active, the system coordinates their monitoring and can prioritize or sequence alarm activation based on which burner poses the greatest fire risk, providing intelligent feedback-based coordination rather than simple independent operation.
3Device complexity
If an audible alarm only is used, then the device complexity is minimized, but the reliability of user notification is worsened for elderly or distracted users who may not hear or respond to the alarm
Solution Approach 1:
The alarm unit is designed to provide multiple types of notifications including audible alarms, visual lights, and wireless alerts to mobile devices. This multi-functional alert system ensures that users with different needs (hearing-impaired, distracted, or remote users) receive appropriate notifications, significantly improving notification reliability while maintaining reasonable system complexity through integrated control.
4Ease of manufacture
If mechanical buttons are used for timer operation, then the ease of manufacture is improved, but the reliability of operation is worsened in steam and oil vapor environments where corrosion and clogging occur
Solution Approach 1:
Mechanical buttons and switches are replaced with electronic touch-sensitive controls or wireless communication interfaces. The microcontroller reads input from touch-sensitive surfaces or receives commands wirelessly from mobile devices, eliminating mechanical parts that corrode or clog in steam and oil vapor environments. This substitution maintains ease of manufacture through standard electronic components while dramatically improving operational reliability in harsh kitchen conditions.
Data Source
AI summary
A safety timer device, for a cooking appliance connected to an energy source, the cooking appliance having a heat generating component in communication with a heat controller. A timer communicates with the heat controller configured to count down a predetermined cooking time. An alarm unit, in communication with the timer, is configured to communicate an alarm signal for a predetermined alarm time after the cooking time expires. An ON/OFF device in communication with the timer, the energy source and the heat generating component, is configured to disconnect the energy source from the heat generating component after the alarm time expires. A reset device in communication with the timer, the alarm unit and the ON/OFF device configured to reset the timer to the predetermined cooking time, terminate the alarm signal after the cooking time expires, and reconnect the energy source with the heat generating component after the alarm time expires.