Pull-out guide and microwave cooking appliance or industrial oven having a pull-out guide
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Solution Overview
Problem
Existing pull-out guides for microwave cooking appliances and industrial heating ovens face issues with microwave radiation absorption, leading to unwanted heating and the risk of plasma discharges, and previous designs with shielding rails restrict full extension and are difficult to clean.
Innovation Solution
A pull-out guide with spring-mounted contact rollers that establish electrical contact between rails, ensuring equipotential grounding and preventing charge buildup, while also implementing a locking and self-closing mechanism for safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a closed hollow cross-section profile shielding rail is used to prevent microwave radiation absorption, then microwave safety is improved, but direct support of the pull-out rail in the movement area becomes impossible and full extension is restricted
Solution Approach 1:
The pull-out guide is divided into two functional zones: a rear end area with closed hollow cross-section profile for microwave shielding and support, and a front area with open cross-section for full extension and guide roller operation. This segmentation allows each zone to fulfill its specific function without compromise.
Solution Approach 2:
Different cross-section profiles are applied to different parts of the pull-out guide: the rear end area uses a closed hollow profile for microwave protection, while the front area uses an open profile to allow guide roller access and full extension. This local differentiation resolves the contradiction between shielding and extension requirements.
2Length of moving object
If a guide roller is used to support the pull-out rail in the front area, then full extension is possible, but additional space is required and cleaning becomes problematic
Solution Approach 1:
The guide roller is extracted from the interior of the pull-out guide and positioned in the front area where it can be easily accessed for cleaning. This extraction eliminates the cleaning accessibility problem while maintaining the full extension capability.
Solution Approach 2:
The guide roller acts as an intermediary element that transfers the load from the pull-out rail to the cooking chamber side wall, enabling full extension without requiring the roller to be integrated into the rail structure itself, thus simplifying cleaning.
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 solution effectively prevents microwave energy absorption and plasma discharges, allows for full extension and easy cleaning, and integrates a locking mechanism to maintain safety and accessibility.
Implementation Method 1
means for making electrical contact between the running rail and the body rail, which comprise at least one contact roller that is rotatably mounted on the cabinet rail and/or the running rail and contacts the other rail
Implementation Method 2
at least one ramp is arranged in the region of the other rail into which the at least one contact roller moves, and that the at least one contact roller is spring-mounted
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
The invention relates to a pull-out guide for a microwave cooking appliance or an industrial oven, comprising a body rail (1) and a running rail (2) that is movable relative thereto, for depositing a carrier. The pull-out guide is characterized in that means for electrically contacting the running rail (2) with the body rail (1) are provided. The invention also relates to a microwave cooking appliance or to an industrial oven having at least one such pull-out guide.