Protected Prong File Fastener with Sheath
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Solution Overview
Problem
Conventional paper fasteners with metal prongs suffer from sharp edges that shear documents and cause injuries, and alternative materials like plastic fail to provide a durable solution due to elasticity or rigidity issues, leading to detachment or cracking.
Innovation Solution
A protected pronged file fastener with a non-metallic sheath overcoating, such as heat-shrinkable tubing or powder coating, is applied to the prongs to cover sharp edges, reducing the risk of injury and document damage while maintaining flexibility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal prongs are used for fastening, then binding strength and durability are improved, but sharp edges cause document shearing and injuries
Solution Approach 1:
A non-metallic sheath material is introduced as an intermediary layer between the metal prong and the document. This sheath covers the sharp metal edges while allowing the prong to maintain its binding function, thus eliminating document shearing and injury risks without sacrificing binding strength
Solution Approach 2:
The fastener combines two different materials: metal for the prong structure (providing strength and durability) and non-metallic sheath material (providing edge protection). This composite structure allows each material to contribute its advantageous properties while mitigating their respective disadvantages
2Object-affected harmful factors
If plastic prongs are used to avoid sharp edges, then safety is improved, but elasticity or rigidity causes cracks and failures
Solution Approach 1:
The invention uses a composite structure where the metal prong provides the structural integrity and resistance to cracking, while the non-metallic sheath provides the safety benefit of rounded edges. This solves the reliability issue that pure plastic prongs cannot overcome
3Object-affected harmful factors
If edges are dulled or rolled to reduce sharpness, then safety is improved, but papers still detach by ripping or shearing
Solution Approach 1:
The non-metallic sheath acts as an intermediary that completely covers the metal prong edges, providing a smooth surface that prevents both injuries and document shearing/ripping, unlike mere edge dulling which leaves the underlying sharp metal exposed
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 effectively prevents document shearing, injuries from sharp edges, and metal fatigue, while ensuring the fasteners remain compact and adaptable to varying document thicknesses, providing a cost-effective and safe binding solution.
Implementation Method 1
a sheath of flexible tubular member heat shrunk on the prongs
Implementation Method 2
a non-metallic sheath powder coating melted on a substantial portion of each prong
Data Source
AI summary
A prong style file fastener, and method of manufacturer, is disclosed which has a protective element to prevent damage to paper documents and personal injury. In one embodiment, the prongs of the fastener is covered with a heat shrinkable sheath. In another, the prongs are overcoated with a powder coating which is melted thereon.