Appliance Door Blocking Mechanism for High-Temperature Locking
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Solution Overview
Problem
Existing door blocking devices for electric household appliances, particularly pyrolytic ovens, are expensive, complex, and unsuitable for high temperatures, making them unreliable and not easily adaptable for use in other appliances.
Innovation Solution
A compact door blocking device with a retaining member, elastic means, and an electromagnetically controlled rotary member with a ratchet mechanism, allowing for straightforward operation and high reliability, even at high temperatures, and eliminating the need for costly microswitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known door blocking devices are used for pyrolytic ovens, then the door can be locked during operation, but the devices are expensive, bulky, and complex due to servomotor operation
Solution Approach 1:
The patent replaces the complex servomotor-based mechanical system with a simpler electromagnet-actuated mechanism. The electromagnet (23) directly actuates the rotary member (15) through magnetic force, eliminating the need for complex mechanical transmission components while maintaining reliable door locking functionality during pyrolytic cycles
Solution Approach 2:
The patent extracts and eliminates unnecessary complex components from the blocking device. By removing the servomotor and associated mechanical transmission elements, the design achieves reliable door locking with a simplified structure consisting mainly of the electromagnet, rotary member with lobe, and retaining member
2Reliability
If servomotor-operated blocking devices are used, then the door can be locked reliably, but the devices become extremely expensive
Solution Approach 1:
The patent employs inexpensive components that can be easily manufactured and replaced if needed. The electromagnet (23), rotary member (15) with simple lobe geometry, and retaining member (10) are designed as cost-effective components without complex machining requirements, significantly reducing manufacturing costs while maintaining functional reliability
Solution Approach 2:
By substituting the expensive servomotor system with a simple electromagnet actuation mechanism, the patent dramatically reduces component costs. The electromagnet directly moves the rotary member through magnetic attraction, eliminating the need for expensive mechanical actuators and complex control systems
3Reliability
If complex blocking devices are used, then the door can be locked during high-temperature cycles, but the devices become bulky and difficult to adapt to other appliances
Solution Approach 1:
The patent designs a universal blocking device with simple, standardized components that can be adapted to different appliance types. The electromagnet-actuated rotary member mechanism with retaining member can be applied to pyrolytic ovens, conventional ovens, and other household appliances requiring door locking, providing multi-functional applicability without requiring appliance-specific complex mechanisms
Solution Approach 2:
By removing appliance-specific complex components and retaining only the essential door locking functionality through the electromagnet and rotary member mechanism, the patent creates a versatile device that can be adapted to various appliance types with minimal modification
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 provides a cost-effective, reliable, and compact door blocking system suitable for pyrolytic ovens and other appliances, ensuring safe operation during high-temperature cycles without the need for expensive microswitches.
Implementation Method 1
an electrically controlled actuator, preferably defined by a straightforward electromagnet, for selectively moving the rotary member
Implementation Method 2
elastic means for pushing the retaining member into the rest position
Implementation Method 3
an electrically controlled actuator, preferably defined by a straightforward electromagnet, for selectively moving the rotary member, preferably by means of a ratchet device
Data Source
AI summary
A door blocking device including a retaining member movable, along a given path, between a work position and a rest position, in which it respectively cooperates with and does not cooperate with a coupling member of the door when the door is in a closed position; and controlled-actuation means for controlled actuation of the retaining member, and which include elastic means for pushing the retaining member into the rest position; means for moving the retaining member into the work position in opposition to the elastic means; a rotary member having at least one radially projecting peripheral lobe; and an electrically controlled actuator for moving the rotary member selectively between a first angular position, in which the at least one lobe does not interfere with the given path (T), thus allowing the retaining member to move between the work position and the rest position, and a second angular position, in which the lobe interferes with the given path to lock the retaining member in the work position in opposition to the elastic means.