Toaster oven control knob and method of controlling a toaster oven
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Solution Overview
Problem
Conventional toaster ovens with a stay-on feature activated in the same direction as the countdown to 'off' pose a safety hazard due to the possibility of unintended continuous operation, lacking a simple and cost-effective solution for requiring a secondary action to engage the stay-on feature.
Innovation Solution
A toaster oven control knob design that includes a rotatable timer control knob with a lock lever mechanism, requiring a button press to rotate from the 'off' position to the 'stay on' position and allowing rotation back to 'off' without additional button presses, incorporating a stationary block and biasing spring to prevent unintended activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stay-on feature is activated in the same direction as the countdown to 'off,' then the control mechanism is simplified, but the risk of unintended continuous operation increases creating a safety hazard
Solution Approach 1:
The patent requires a preliminary button press action before the control knob can be rotated to the stay-on position. This preliminary action (depressing the button) modifies the state of the control mechanism to enable the stay-on activation, ensuring that the user intentionally initiates the stay-on mode rather than accidentally activating it during normal operation or shutdown.
2Object-affected harmful factors
If a secondary action is required to engage the stay-on feature, then safety is improved by preventing unintended activation, but the device complexity increases
Solution Approach 1:
The patent combines the button and control knob into a single integrated control assembly. The button is positioned on the control knob such that both elements work together as one unified interface. This merging reduces overall device complexity compared to having separate controls, while still requiring the secondary button press action to prevent unintended stay-on activation.
Solution Approach 2:
The button acts as an intermediary element between the user and the stay-on activation function. By requiring the button press as an intermediate step before knob rotation can activate stay-on mode, it provides an additional layer of intentional user confirmation without requiring complex electronic controls or multiple separate components.
3Object-affected harmful factors
If a button press is required before rotating the control knob to 'stay on,' then safety is enhanced by ensuring intentional activation, but the ease of operation is reduced
Solution Approach 1:
The patent creates a dynamic control mechanism where the button can be depressed and then released, allowing the control knob to be freely rotated to the stay-on position. This dynamic state change (button depressed → released → knob rotatable) provides a clear tactile indication to the user that they are intentionally activating stay-on mode, while still maintaining relatively simple operation compared to multi-step electronic confirmation systems.
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
Enhances user safety by ensuring a secondary action is required for stay-on activation, preventing unintended continuous operation and reducing the risk of fires, while maintaining a simple and cost-effective design.
Implementation Method 1
a biasing spring to bias the lock lever to the first position
Data Source
AI summary
A toaster oven comprising a housing defining a food cavity, an opening defined in the housing, a door movably affixed to the housing, a cooking grid selectively mountable within the housing, one or more heating elements within the housing, a timer controlling activation of the heating elements, and a timer control knob engaged with the timer. The timer control knob is selectively rotatable in a second direction from the off position to a third position to activate at least one of the one or more heating elements until the timer control knob is selectively rotated in the first direction back to the off position. The timer control knob has a selectively movable button, such that the timer control knob is only selectively rotatable in the second direction from the off position to the third position when the button is moved from a first position to a second position.