Safely knob assembly for a burner
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Solution Overview
Problem
Unsupervised children, elderly adults, and ill individuals may accidentally actuate stove, oven, or grill burners, leading to safety risks such as burns, fires, and gas buildup due to the ease of use of traditional knobs, which lack effective safety mechanisms to prevent unintended energy delivery.
Innovation Solution
A safety knob assembly featuring a dial with alignment holes, an interlock disk, locking pins, a safety post, and a spring mechanism that requires intentional action to engage and disengage the energy flow, preventing accidental activation by ensuring the knob can only be rotated to actuate the burner with deliberate effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional knob is used to control the burner, then the ease of operation is improved, but the safety reliability deteriorates due to accidental actuation by children, elderly, or ill individuals
Solution Approach 1:
The knob assembly is segmented into multiple functional components: a rotatable dial for user interaction, a separate interlock disk with locking pins, and a switch post mechanism. This segmentation allows the safety function to be independent from the operation function, enabling easy dial rotation while requiring deliberate action to actuate the burner.
Solution Approach 2:
The interlock disk and locking pins are pre-positioned to engage with the switch post before the burner can be actuated. The spring mechanism is pre-loaded to maintain the locking engagement, requiring the user to first disengage the safety mechanism before the burner can be turned on or off.
2Reliability
If a safety mechanism is added to the knob assembly, then the safety reliability is improved, but the device complexity increases
Solution Approach 1:
The safety function is merged into the existing knob assembly by integrating the interlock disk and locking pins within the same housing as the dial. The spring mechanism is positioned between existing components (dial and locking post), combining multiple functions into a unified assembly rather than adding separate safety devices.
Solution Approach 2:
The interlock disk acts as an intermediary component between the user-operated dial and the burner control switch post. The locking pins on the interlock disk mediate the interaction, requiring deliberate disengagement action while allowing the dial to rotate freely for positioning without directly actuating the burner.
3Manufacturing precision
If the locking pins have the same diameter as the alignment holes, then the manufacturing precision is simplified, but the reliability of locking engagement deteriorates
Solution Approach 1:
The locking pins have a non-uniform diameter profile along their length, with a larger diameter portion for secure engagement with the alignment holes and a smaller diameter portion for spring compression. This local variation in quality provides both reliable locking when engaged and proper spring interaction for the safety mechanism.
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 safety knob assembly effectively prevents accidental actuation of burners, reducing the risk of burns, fires, and gas buildup by requiring a deliberate action to initiate and terminate energy flow, thus enhancing safety for vulnerable individuals.
Implementation Method 1
a spring, the spring sized such that the inner diameter of the spring is larger than the outside diameter of the safety post, the spring positioned on the safety post and positioned between the dial and the locking post
Data Source
AI summary
A safety knob assembly for actuating a burner is provided. The safety knob assembly includes a dial, the dial includes at least one alignment hole, an interlock disk, the interlock disk includes at least one locking pin, the at least one locking pin having an outer diameter less than then the inner diameter of the at least one alignment hole, a safety post, the safety post connected to the dial and the safety post including a locking hub, the locking hub connected to a switch post, a spring, the spring sized such that the inner diameter of the spring is larger than the outside diameter of the safety post, the spring positioned on the safety post and positioned between the dial and the locking post, wherein the at least one locking pin of the interlock disk engages the at least one alignment hole of the dial as a bottom surface of the dial approaches a top surface of the interlock disk, wherein the interlock disk engages the locking hub as a bottom surface of the interlock disk approaches the locking hub, and wherein the burner is actuated as the dial, the interlock disk, the safety post and the locking hub are positioned to rotate the switch post relative to the burner to allow the flow of energy from an energy source to the burner.