Multi-Pane Oven Door Locking for Defective Inner Glass
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Solution Overview
Problem
Existing cooking appliances with multi-pane construction doors lack a reliable mechanism to prevent operation when the inner pane is defective, risking inadequate thermal insulation and safety during high-temperature processes like pyrolysis.
Innovation Solution
A cooking appliance with a locking device between the panes that automatically prevents complete closure of the door if the inner pane is defective, using a preloaded locking element and a detector system to ensure the control device remains blocked, thus preventing operation with a defective door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a multi-pane construction is used for the cooking chamber door, then thermal insulation is improved and outer surface temperature is reduced, but the risk of undetected pane defects increases
Solution Approach 1:
The locking element is preloaded in a retracted position during normal operation. When a pane defect occurs, the locking element automatically moves to a blocking position to prevent door closure, thereby preliminarily preventing unsafe operation before the user can activate the appliance.
Solution Approach 2:
The locking element acts as an intermediary mechanical component between the panes and the door closure mechanism. It mediates the safety function by physically blocking door closure when pane integrity is compromised, without requiring electronic detectors or complex control systems.
2Reliability
If a detector device is added to detect defective panes, then safety is improved, but device complexity increases
Solution Approach 1:
The system performs self-diagnosis through the mechanical state of the locking element. The locking element itself serves as both the sensor (detecting pane integrity through its position) and the actuator (blocking door closure), eliminating the need for separate electronic detectors, controllers, or power supplies.
Solution Approach 2:
The patent replaces complex electronic detection systems with a purely mechanical solution. The locking element's position, determined by pane integrity, directly controls door closure capability without requiring electrical sensors, signal processing, or electronic control logic.
3Reliability
If panes are made of laminated glass to prevent leakage, then safety is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the safety function from the pane material itself (laminated glass) and relocates it to a separate mechanical component (locking element). This allows the use of simpler, easier-to-manufacture glass panes while maintaining safety through the independent locking mechanism.
Data Source
AI summary
A cooking appliance (1) includes a cooking chamber (4) heatable by a heating device (3), a cooking chamber opening (5), a cooking chamber door (6) closing off the cooking chamber opening (5), and a control device (7) for controlling the heating device (3). The cooking chamber door (6) has a multi-pane construction having a first pane (8) and a second pane (9). A detector device (10) operatively connected to the control device (7) is actuated by the cooking chamber door (6). In addition, a locking device (11) between the first (8) and the second pane (9) includes a locking element (12), which is held preloaded in an initial state (13) between the first (8) and the second pane (9), and if the first pane (8) is defective, the locking element (12) is automatically displaced to a locking position (14), thereby preventing a complete closure of the cooking chamber door (6).