Safety closure for a bowl of a kitchen machine, bowl with safety closure and kitchen machine
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Solution Overview
Problem
Modern food processors require a secure closure mechanism to prevent food from being thrown out of the container during processing and to ensure user safety, as existing safety locks may not reliably prevent rotor activation unless the lid is properly closed.
Innovation Solution
A safety lock system comprising a connecting unit, a locking ring, and a cover that can be rotated to a closed position, with a switching element that signals when both the cover and locking ring are securely closed, allowing rotor activation only in this position, ensuring the system is mechanically reliable and resistant to heat and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety lock mechanism is implemented to prevent rotor activation unless the lid is properly closed, then user safety is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical safety lock mechanisms with a simpler electrical detection system. The switching element detects the rotational position of the locking ring through electrical fields or contacts, eliminating the need for complex mechanical interlocks while maintaining safety functionality.
Solution Approach 2:
The switching element acts as an intermediary between the locking ring's mechanical position and the rotor activation control. It translates the mechanical state (locked/unlocked) into an electrical signal that controls whether the rotor can be activated, simplifying the overall safety mechanism.
2Reliability
If a switching element is added to detect the closed position of the cover and locking ring, then reliability of safety control is improved, but device complexity increases
Solution Approach 1:
The switching element serves multiple functions: it detects both the cover's closed position and the locking ring's locked position, and it controls rotor activation. This multi-functionality reduces the need for separate sensors and control mechanisms, actually simplifying the overall system despite adding one component.
Solution Approach 2:
The patent combines the detection of multiple safety conditions (cover closed, locking ring locked) into a single switching element system. Rather than using separate sensors for each condition, the switching element integrates these detection functions, reducing component count and simplifying control logic.
3Ease of operation
If the locking ring can be rotated independently of the cover, then ease of operation is improved, but reliability of safety control may worsen
Solution Approach 1:
The switching element provides feedback about the locking ring's rotational position to the control system. Even though the locking ring can be rotated independently, the system continuously monitors its position and only allows rotor activation when the switching element detects the correct locked position, maintaining reliability while improving ease of operation.
Solution Approach 2:
The system allows dynamic rotation of the locking ring independent of the cover during operation, but maintains safety control through the switching element's position detection. This dynamic capability enables easier adjustment and operation while the electrical control ensures safety requirements are still met.
Data Source
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AI summary
A safety lock 1 for a food processor container is disclosed, comprising a connecting unit 10, a locking ring 20, and a cover 30, 30'. An active element 12 and a switching element 13 are arranged on the connecting unit 10, an actuating element 22 on the locking ring 20, and a functional element 34, 34 on the cover 30, 30'. When the locking ring is in a locking ring closed position and the cover is in a cover closed position, the functional element 34, 34', the active element 12, and the actuating element are all in their respective effective positions, thus forming a chain of action that results in a closing signal position for the switching element 13. A container with such a safety lock 1 and a food processor with such a container are also disclosed.