Bayonet Lock Volume Elements for Compact Pressure Cooker Design
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Solution Overview
Problem
Conventional bayonet locking systems in pressure cookers have suboptimal mechanical resistance, deformation resistance, weight, aesthetics, ergonomics, and ease of use, with long ramps affecting the appearance and usability of domestic pressure cookers.
Innovation Solution
The use of bayonet locking means with volume elements formed by localized radial deformation of the tank and lid materials, creating three-dimensional protrusions with convex and concave faces that provide enhanced mechanical properties and reduced length, allowing for a more compact and robust locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bayonet locking systems use long ramps extending along the perimeter of the tank and lid, then the locking mechanism can withstand the required test pressure of 500 kPa, but the pressure cooker has poor aesthetics and increased weight
Solution Approach 1:
The patent transitions from two-dimensional flat ramps to three-dimensional volume elements with curved surfaces. The protrusions are formed by localized radial deformation creating volumetric structures that engage through a small angular rotation, eliminating the need for long peripheral ramps while maintaining locking strength.
Solution Approach 2:
The invention changes the geometric parameters of the locking elements from long, thin, planar ramps to compact, thick, volumetric protrusions. This parameter change allows the locking mechanism to achieve sufficient mechanical strength with significantly reduced length and improved aesthetics.
2Reliability
If conventional bayonet locking systems use long ramps, then the locking mechanism can withstand test pressure, but the angular travel required for locking is large making it difficult to operate
Solution Approach 1:
By creating three-dimensional volume elements with curved engagement surfaces, the patent enables the locking action to occur through a small angular rotation of the lid relative to the tank. The volumetric protrusions engage smoothly with complementary recesses, reducing the required angular travel compared to long planar ramps.
3Reliability
If conventional bayonet locking systems use long ramps made by folding and cutting, then the locking mechanism functions, but the resistance to deformation and bending is suboptimal
Solution Approach 1:
The patent employs curved surfaces and volumetric forms for the locking protrusions instead of flat, folded ramps. The localized radial deformation creates smoothly curved engagement surfaces that distribute stresses more effectively, significantly improving resistance to deformation and bending while maintaining locking function.
4Reliability
If conventional bayonet locking systems use long peripheral ramps, then the locking mechanism is robust, but the weight of the pressure cooker increases
Solution Approach 1:
The patent extracts the essential locking function from the long peripheral ramps and concentrates it into compact volumetric protrusions. By removing the excessive length of the ramps while retaining the core engagement mechanism, the invention significantly reduces the weight of the locking components without compromising robustness.
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
This solution results in a pressure cooker with improved resistance to bending, reduced angular displacement required for locking, and a more aesthetically pleasing design, while maintaining robustness and ease of use.
Implementation Method 1
each protrusion of at least one of said series of protrusions is constituted by a volume element which has opposite convex and concave faces and is formed by a localized radial deformation of the material forming the corresponding envelope
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
- A food cooking apparatus (1) under pressure comprising at least: - a tank (2) and a lid (3) intended to be locked relative to the tank (2) to form with the latter a cooking chamber capable of building up pressure, - bayonet locking means forming first and second series of protrusions (5A - 5J, 6A - 6J) which are integral respectively with the cover (3) and the tank (2) and which are intended to cooperate together to ensure the locking of the lid (3) relative to the tank (2), said apparatus being characterized in that each protrusion of at least one of said series is constituted by a volume element which has opposite convex (50A - 50J) and concave (51A - 51J) faces, and which is formed by a localized radial deformation of the corresponding shell,Each volumetric element is associated with a respective opening (7A - 7J) formed through the corresponding envelope and delimited by at least one edge (70A - 70J), said localized radial deformation being positioned relative to said respective opening such that at least a portion of said edge (70A - 70J) is radially deformed and forms part of said associated volumetric element. - Pressure cooking appliances.