Lunchbox Inversion-Activated Heating for Leak-Tight Food Warming
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Solution Overview
Problem
Existing lunchboxes with heating capabilities require complex electrical configurations and do not efficiently allow for heating food by simply inverting the container, as they lack a straightforward mechanism to activate heating elements when the container is turned upside down.
Innovation Solution
Incorporating switching means within the closure lid that allow electric current to pass to heating elements when the container is inverted, utilizing flexible conductive sheets and safety switching means to ensure safe operation and leak-tight closure, allowing the weight of food to activate heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrical heating means are incorporated in the closure lid, then heating capability is provided, but the device complexity increases due to required electrical connections and switching mechanisms
Solution Approach 1:
The lunchbox is inverted to activate the heating function. When the lunchbox is turned upside down and placed on the closure lid, the weight of the food closes the switching means, completing the electrical circuit and activating the heating elements. This inversion-based activation simplifies the control mechanism while providing intuitive operation.
Solution Approach 2:
The heating system is activated automatically by the weight of the food itself. The food's weight closes the switching means, which completes the electrical circuit and activates the heating elements without requiring manual intervention. The system serves itself by using the food's presence and weight as the activation trigger.
2Ease of operation
If switching means are added to activate heating when inverted, then ease of operation is improved, but the device complexity increases due to additional components
Solution Approach 1:
The switching means is designed to be closed automatically by the weight of the food when the lunchbox is inverted. This self-activating mechanism eliminates the need for manual switching or complex control systems, as the food's own weight triggers the heating function.
Solution Approach 2:
The electrical switching mechanism is triggered by a simple mechanical action - the weight of the food closing a switch when the lunchbox is inverted. This replaces complex electronic controls with a straightforward mechanical-weight-based activation system.
3Ease of operation
If the lunchbox is designed to be inverted for heating, then ease of operation is improved, but reliability may worsen due to potential leakage or improper closure
Solution Approach 1:
The lunchbox is specifically designed to be inverted for heating operation. The closure lid is engineered to maintain a secure, leak-tight seal even when inverted, allowing the heating function to be activated safely and effectively in the inverted position.
Solution Approach 2:
The closure lid is designed with features that prevent leakage and ensure proper closure before inversion. The switching means is configured to only activate heating when the lunchbox is properly closed and inverted, preventing accidental activation or leakage during the inversion process.
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
Enables easy and safe heating of food by inverting the lunchbox, ensuring efficient energy transfer and leak-tight sealing, making it a versatile accessory for conventional containers.
Implementation Method 1
The closure lid (3) comprises electrical heating means (4)... the passage of an electric current to the electrical heating means (4) of the closure lid (3) is allowed and heating of said food occurs
Implementation Method 2
switching means (5) which are closed to allow the passage of an electric current toward the heating means (4) when the food (C) in the container (2) is supported on the closure lid (3)... the switching means (5) are configured for being closed as a result of the weight of the food (C) in the container (2) on the closure lid (3)
Data Source
Figure 1
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Figure 3
AI summary
Lunchbox (1) comprising a container (2) for food (C) and a closure lid (3) for closing the container (2) in a leak-tight manner, the closure lid (3) comprising electrical heating means (4). The closure lid (3) comprises switching means (5) which are closed to allow the passage of an electric current toward the heating means (4) when the food (C) in the container (2) is supported on the closure lid (3).