Enamelled Oven Sheet Assembly With Single-Point Grounding
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Solution Overview
Problem
Existing cooking ovens with enamelled sheet metal entities require multiple ground couplings to comply with safety regulations, increasing the effort and complexity of grounding these non-conductive components.
Innovation Solution
A screw connection system that electrically couples a pair of enamelled sheet metal entities by using a screw with a thread that penetrates the enamel layer, providing a single point of grounding through a conductive screw shaft and a ground element, either directly or indirectly coupled to one of the enamelled entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each enamelled metallic entity is grounded separately, then safety compliance is achieved, but the number of ground couplings increases
Solution Approach 1:
The patent merges multiple separate ground couplings into a single ground coupling that can ground multiple enamelled metallic entities simultaneously. The screw connection system allows one ground coupling to electrically connect several enamelled entities through the screw's conductive path, reducing the total number of ground couplings needed while maintaining safety compliance.
Solution Approach 2:
The screw connection serves multiple functions: it mechanically fastens the metallic entities together and simultaneously provides electrical grounding for all connected entities. This multi-functional approach eliminates the need for separate dedicated ground couplings for each entity, simplifying the overall grounding system.
2Reliability
If multiple ground couplings are used for enamelled entities, then grounding reliability is improved, but the effort for grounding increases
Solution Approach 1:
The invention combines multiple grounding operations into a single assembly step. When metallic entities are stacked and fastened with screws, the grounding function is automatically achieved through the screw's electrical conductivity, eliminating the need for separate grounding operations for each entity and significantly reducing manufacturing effort.
Solution Approach 2:
The screw connection system performs grounding automatically as part of its mechanical fastening function. The conductive screw inherently provides the electrical path to ground for all connected entities without requiring additional grounding components or steps, making the system self-sufficient for both mechanical and electrical connection requirements.
3Device complexity
If a single screw connection is used to couple enamelled entities, then the number of ground couplings is reduced, but electrical coupling between entities must be ensured
Solution Approach 1:
The screw acts as an intermediary element that bridges the electrical connection between enamelled metallic entities. Its threaded shaft penetrates the enamel coating to establish direct electrical contact with the metallic substrate, creating a reliable conductive path that enables both mechanical fastening and electrical coupling simultaneously.
Solution Approach 2:
The screw connection changes the electrical parameter state by creating a conductive path through the insulating enamel layer. The threaded structure allows the screw to penetrate and break through the enamel's electrical insulation, transforming the electrical relationship from isolated to connected while maintaining mechanical fastening function.
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
This solution simplifies the grounding process by allowing a pair of enamelled sheet metal entities to be electrically coupled with a single screw connection, ensuring reliable mechanical and electrical coupling while reducing the number of ground couplings needed, thus enhancing efficiency and safety compliance.
Implementation Method 1
The screw is at least indirectly electrically coupled with the ground element. In addition, the screw shaft comprises a thread for providing an electric coupling between the enamelled sheet metal entities
Data Source
AI summary
The invention relates to a cooking oven comprising at least two entities made of sheet metal (2, 3), each sheet metal entity (2, 3) comprising at least one surface carrying an enamel layer, specifically a vitreous enamel layer, said enamelled sheet metal entities (2, 3) overlapping each other and a screw connection for grounding and coupling said enamelled sheet metal entities (2, 3), wherein a ground element is at least indirectly coupled with one of said enamelled sheet metal entities (2, 3) for grounding said stack of enamelled sheet metal entities (2, 3), wherein at least one screw (5) with a screw shaft (5.1) is provided through said enamelled sheet metal entities (2, 3), wherein the screw (5) is at least indirectly electrically coupled with the ground element and said screw shaft (5.1) comprises a thread for providing an electric coupling between the enamelled sheet metal entities (2, 3).