Single-Sheet Metal Cookware Handles for Hygienic Attachment
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Solution Overview
Problem
Commercial cookware faces issues with rivet-based handle construction leading to hygiene problems, durability concerns, uncomfortable handling, excessive heat conduction, and mechanical failures, particularly in high-temperature environments.
Innovation Solution
A single-piece metal cookware design fabricated using profile blanking, spinning, and stamping techniques to create a handle with a 'U' shaped cross-section and strategically placed openings, reducing heat conduction and enhancing dynamic comfort and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rivet-based handle construction is used, then the handle can be attached to the pan body, but hygiene problems occur due to food residue sheltering around rivet heads
Solution Approach 1:
The patent merges the handle and pan body into a single integrated piece of metal, eliminating the rivet joint entirely. The handle is formed as an integral extension of the pan body through stamping and shaping operations, creating a seamless construction with no gaps or crevices where food residue can accumulate.
Solution Approach 2:
The invention extracts and removes the rivet component from the handle attachment system. By eliminating the rivet entirely and using a one-piece construction, the source of hygiene contamination is completely removed while maintaining handle attachment through integral forming.
2Reliability
If rivet-based handle construction is used, then the handle can be attached to the pan body, but durability concerns arise as rivets can work loose over time
Solution Approach 1:
The handle and pan body are merged into a single monolithic structure through integral forming processes. This eliminates the rivet joint that is prone to loosening, creating a permanent, maintenance-free attachment that cannot work loose or fail over time.
3Device complexity
If traditional narrow strip steel handles are used, then the handle provides basic functionality, but dynamic performance deteriorates due to limited leverage and increased hand strain
Solution Approach 1:
The patent transitions from a simple narrow strip handle to a multi-dimensional handle structure with varying cross-sectional shapes along its length. The handle features a thickened grip section with ergonomic contours, creating additional spatial dimensions for hand placement and leverage while maintaining structural simplicity.
Solution Approach 2:
The handle is designed with different local qualities along its length - a thicker, ergonomically contoured grip section for hand comfort and leverage, transitioning to a thinner connection section at the pan body. This local variation optimizes both dynamic performance and user comfort without unnecessary complexity.
4Reliability
If all-metal handle designs are used, then the handle provides durability and heat resistance, but heat conduction increases significantly from pan body to handle
Solution Approach 1:
The handle is segmented into distinct sections with different thermal and structural characteristics. A thickened grip section is positioned away from the pan body, creating a thermal break that reduces heat conduction to the user's hand while maintaining the all-metal construction for durability.
Solution Approach 2:
The handle features local quality variations where the grip section has different dimensions and potentially different material properties compared to the connection section. This localized design reduces heat conduction pathways to the hand while preserving the heat-resistant and durable characteristics of the all-metal construction.
5Ease of operation
If round handles are used, then static comfort is improved, but dynamic performance deteriorates due to increased rotational forces requiring additional squeezing
Solution Approach 1:
The handle cross-section varies locally along its length, featuring an ergonomically contoured grip section that optimizes both static comfort and dynamic performance. The contours are designed to naturally resist rotational forces during sauté tosses while maintaining a comfortable static grip position.
Solution Approach 2:
The handle incorporates curved and contoured surfaces rather than simple geometric shapes. The ergonomic contours follow natural hand shapes and provide mechanical advantage for controlling rotational forces, combining the benefits of rounded comfort with optimized force distribution.
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 eliminates rivet-related hygiene issues, enhances durability, reduces hand strain, and minimizes heat transfer to the handle, providing a comfortable and robust cooking experience in demanding environments.
Implementation Method 1
Many all-metal handle designs (riveted/welded or cast) in the market conduct significant heat up the handle to the zone gripped by the cook's hand.
Data Source
AI summary
The profile shape of the vessel body and of handle portion is formed from a single sheet of metal to create a flat by cutting, stamping or blanking. An opening is created in the handle portion to reduce heat propagation. The shape of the pan body is formed by spinning with the flat handle portion. The handle is formed by creating three-dimensional contours in the handle portion of the blank. The neck portion has a flat section adjacent the pan body followed by sections of different curvature. One section of the neck portion has a deeply curved cross-section. That neck portion transitions to the hand grip portion which has a reduced curvature, particularly toward the unattached end of the handle. The neck portion may have a “W” cross sectional shape. The handle grip portion may have a “U” shaped cross-section for comfort.