Starched Fabric Box Handle Composite Structure
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Solution Overview
Problem
Existing retractable handles for boxes are inconvenient to use due to rigidity, uncomfortable for lifting heavy loads, and prone to breaking, lacking sufficient resistance.
Innovation Solution
A handle comprising two sheets of kraft paper with a fabric handle made of starched cotton yarn, integrated with folding lines and vinyl treatment, allowing easy extension and retraction, and secure attachment to the sheets for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the handle is made of rigid paper material, then the handle can be easily manufactured and integrated into the box, but the handle becomes difficult to extract and distend from the slot
Solution Approach 1:
The patent applies parameter changes by transforming the handle material from rigid paper to flexible starched fabric. This changes the physical properties of the handle, making it soft and distendable while still maintaining manufacturability through integration with paper sheets. The flexible fabric allows the handle to be easily extracted and shaped from the slot, resolving the contradiction between ease of manufacture and ease of operation.
Solution Approach 2:
The patent uses composite materials by combining starched fabric with paper sheets. The fabric handle is constrained between two paper sheets, creating a composite structure that leverages the manufacturability of paper while providing the operational benefits of flexible fabric. This composite approach allows the handle to be easily manufactured as an integrated unit while remaining easy to extract and shape during use.
2Volume of moving object
If the handle is made of thin paper material, then the overall dimensions of the box can be minimized when folded, but the handle becomes uncomfortable for lifting heavy loads
Solution Approach 1:
The patent applies parameter changes by treating the fabric handle with starch, which fundamentally alters the physical properties of the material. The starch treatment increases the strength and load-bearing capacity of the thin fabric handle without increasing its thickness or volume. This allows the handle to remain compact when folded while providing sufficient strength for lifting heavy loads, resolving the contradiction between minimizing volume and maintaining strength.
Solution Approach 2:
The patent uses composite materials by combining thin starched fabric with paper sheets. The fabric provides flexibility and compactness when folded, while the paper sheets provide structural support and additional strength. This composite structure enables the handle to maintain a small overall dimension when not in use while providing the necessary strength for heavy load lifting when deployed.
3Ease of manufacture
If the handle is made of simple paper strip, then the manufacturing process is simple, but the handle lacks sufficient resistance and breaks frequently
Solution Approach 1:
The patent applies parameter changes by applying starch treatment to the fabric handle. This chemical treatment fundamentally changes the properties of the fabric, increasing its resistance, durability, and load-bearing capacity. The starched fabric becomes more resistant to breaking while maintaining the relative simplicity of the manufacturing process, as the starch application can be integrated into existing production lines. This resolves the contradiction between manufacturing simplicity and handle resistance.
Solution Approach 2:
The patent uses composite materials by combining starched fabric with paper sheets and vinyl products. This multi-material composite structure provides enhanced resistance and durability compared to simple paper strips. The fabric-vinyl-paper composite maintains manufacturing simplicity through integrated construction while significantly improving the handle's resistance to breaking and failure, resolving the contradiction between ease of manufacture and reliability.
4Volume of moving object
If the handle strip is completely housed in the slot, then the box dimensions are minimized, but the user encounters considerable difficulty in extracting and distending it
Solution Approach 1:
The patent applies parameter changes by using soft, flexible starched fabric instead of rigid paper for the handle. This material parameter change allows the handle to be completely housed in the slot, minimizing box dimensions, while the flexible nature of the starched fabric enables easy extraction and distension by the user. The starched fabric can be readily shaped and manipulated, resolving the contradiction between minimizing box dimensions and ensuring ease of operation.
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 handle is easy to use, comfortable for heavy loads, and highly resistant, with the fabric design ensuring convenient grip and automatic folding for compact storage.
Implementation Method 1
The handle 5 comprises a fabric made with a cotton yarn starched with a vinyl product
Implementation Method 2
a fabric made with a cotton yarn starched with a vinyl product, appropriately selected from polyester, polypropylene, rayon or hemp
Implementation Method 3
it has, in correspondence with the grip portion 5b, one or more folding lines 5c around which the grip portion 5b tends to flex and/or bend
Data Source
AI summary
A handle (1) for a box is provided for comprising two sheets (2, 3) of paper material overlapping and integrally bound to each other; an opening (4) made on one of the sheets (2, 3); a handle (5) in fabric, positioned between the sheets (2, 3) and defining two ends (5a) opposite to each other and a grip portion (5b) between the ends (5a); said ends (5a) are integrally bound between the sheets (2, 3) placing the grip portion (5b) over the opening (4).