Pressure Cooker Lid Retaining Mechanism for Stable Pre-Locking
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Solution Overview
Problem
Conventional manhole pressure cookers with recessed lids suffer from unstable pre-locking positions, leading to potential lid falls into the tank, which soils the lid and can cause food particles to enter the safety or regulation valves, compromising their functionality. Additionally, the ergonomic issues make correct positioning challenging, increasing the risk of incorrect locking or damage to the cooker.
Innovation Solution
A manhole pressure cooker design featuring a retaining mechanism that maintains the lid in a stable position away from the tank bottom, even without user intervention, using a flexible arm and support structure to ensure the lid remains secure until proper locking is achieved, thereby preventing accidental falls and ensuring correct alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lid is placed in the pre-locking position without a retaining mechanism, then the locking operation can be performed, but the lid spontaneously falls to the bottom of the tank due to gravitational force
Solution Approach 1:
The retaining mechanism (protrusion and recess) is designed to preemptively counteract the gravitational force that causes the lid to fall. The protrusion on the lid engages with the recess in the tank bottom before the locking operation is completed, creating a preliminary opposing force that prevents the lid from spontaneously falling during the locking process.
Solution Approach 2:
The retaining mechanism acts as an intermediary element between the lid and the tank bottom. The protrusion-recess combination provides a temporary mechanical connection that mediates the interaction between the lid's weight and the tank bottom, allowing the lid to be held in the pre-locking position without requiring continuous manual force.
2Reliability
If manual force is continuously applied to maintain the lid in the pre-locking position, then the lid remains stable, but the user cannot perform other operations and the process becomes cumbersome
Solution Approach 1:
The retaining mechanism is designed to be self-activating and self-maintaining. Once the lid is placed in the pre-locking position, the protrusion automatically engages with the recess, and the mechanism maintains the lid's position without requiring continuous user intervention. The elastic deformation of the protrusion provides the necessary retaining force automatically.
Solution Approach 2:
The retaining mechanism performs the action of holding the lid in position automatically as soon as the lid is placed in the pre-locking position, before the user completes the locking operation. This preliminary action eliminates the need for the user to continuously apply manual force throughout the entire locking process.
3Reliability
If the lid falls into the tank contents, then the lid becomes soiled and food particles may enter the safety valve or regulation valve, but the retaining mechanism adds structural complexity
Solution Approach 1:
The retaining mechanism is merged with the existing lid and tank bottom structures. The protrusion is integrated into the lid's handle assembly, and the recess is formed as part of the tank bottom, rather than being separate additional components. This merging approach minimizes the increase in device complexity while providing the necessary retaining function.
Solution Approach 2:
The protrusion-recess retaining mechanism serves multiple functions: it prevents the lid from falling during the locking operation, maintains the lid in the pre-locking position, and protects the lid and valves from contamination. This multi-functionality justifies the added structural elements by providing multiple benefits from a single mechanism.
4Ease of operation
If the handles are slightly angularly offset, then the visual alignment appears correct, but the locking operation fails or the seal is compromised
Solution Approach 1:
The retaining mechanism provides tactile feedback to the user during the locking operation. When the protrusion engages with the recess, the user feels a distinct mechanical engagement, confirming that the lid is correctly positioned. This feedback mechanism allows the user to detect misalignment and adjust the lid position before completing the locking operation, preventing failed locking or seal compromise.
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 design significantly reduces the risk of lid falls and ensures proper locking, enhancing ergonomics and safety by maintaining the lid at a safe distance from the tank contents, facilitating intuitive use and preventing potential damage or contamination.
Implementation Method 1
The user then only has to exert a vertical pressure on the cover handle to cause the spring blade to bend, in order to allow the engagement of a hooking part fitted to the free end of the cover handle
Data Source
AI summary
- Manhole pressure cooker with cover retaining means. - The invention relates to a manhole pressure cooker (1) comprising a recessed lid (2), a lid handle (3), a cooking vessel (7) provided with a bottom (7A), as well as a bowl handle (8), said lid (3) and bowl (8) handles being provided with locking means (10,11) capable of cooperating, when the lid (2) is in a pre-position lock to lock the lid (2), said pressure cooker (1) being characterized in that it comprises retaining means which allows said lid (2) to reach a stable retaining position in which said retaining means maintains by itself even the cover (2) away from said bottom (7A). - Pressure cookers.